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gecko-dev/layout/base/nsCSSRendering.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* utility functions for drawing borders and backgrounds */
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsIFrame.h"
#include "nsPoint.h"
#include "nsRect.h"
#include "nsIViewManager.h"
#include "nsIPresShell.h"
#include "nsFrameManager.h"
#include "nsStyleContext.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsTransform2D.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIScrollableFrame.h"
#include "imgIRequest.h"
#include "imgIContainer.h"
#include "nsCSSRendering.h"
#include "nsCSSColorUtils.h"
#include "nsITheme.h"
#include "nsThemeConstants.h"
#include "nsIServiceManager.h"
#include "nsLayoutUtils.h"
#include "nsINameSpaceManager.h"
#include "nsBlockFrame.h"
#include "gfxContext.h"
#include "nsRenderingContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "gfxPlatform.h"
#include "gfxImageSurface.h"
#include "nsStyleStructInlines.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsContentUtils.h"
#include "nsSVGEffects.h"
#include "nsSVGIntegrationUtils.h"
#include "gfxDrawable.h"
#include "sampler.h"
#include "nsCSSRenderingBorders.h"
#include "mozilla/css/ImageLoader.h"
#include "ImageContainer.h"
#include "mozilla/HashFunctions.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Types.h"
#include <ctime>
using namespace mozilla;
using namespace mozilla::css;
// To avoid storing this data on nsInlineFrame (bloat) and to avoid
// recalculating this for each frame in a continuation (perf), hold
// a cache of various coordinate information that we need in order
// to paint inline backgrounds.
struct InlineBackgroundData
{
InlineBackgroundData()
: mFrame(nullptr), mBlockFrame(nullptr)
{
}
~InlineBackgroundData()
{
}
void Reset()
{
mBoundingBox.SetRect(0,0,0,0);
mContinuationPoint = mLineContinuationPoint = mUnbrokenWidth = 0;
mFrame = mBlockFrame = nullptr;
}
nsRect GetContinuousRect(nsIFrame* aFrame)
{
SetFrame(aFrame);
nscoord x;
if (mBidiEnabled) {
x = mLineContinuationPoint;
// Scan continuations on the same line as aFrame and accumulate the widths
// of frames that are to the left (if this is an LTR block) or right
// (if it's RTL) of the current one.
bool isRtlBlock = (mBlockFrame->GetStyleVisibility()->mDirection ==
NS_STYLE_DIRECTION_RTL);
nscoord curOffset = aFrame->GetOffsetTo(mBlockFrame).x;
// No need to use our GetPrevContinuation/GetNextContinuation methods
// here, since ib special siblings are certainly not on the same line.
nsIFrame* inlineFrame = aFrame->GetPrevContinuation();
// If the continuation is fluid we know inlineFrame is not on the same line.
// If it's not fluid, we need to test further to be sure.
while (inlineFrame && !inlineFrame->GetNextInFlow() &&
AreOnSameLine(aFrame, inlineFrame)) {
nscoord frameXOffset = inlineFrame->GetOffsetTo(mBlockFrame).x;
if(isRtlBlock == (frameXOffset >= curOffset)) {
x += inlineFrame->GetSize().width;
}
inlineFrame = inlineFrame->GetPrevContinuation();
}
inlineFrame = aFrame->GetNextContinuation();
while (inlineFrame && !inlineFrame->GetPrevInFlow() &&
AreOnSameLine(aFrame, inlineFrame)) {
nscoord frameXOffset = inlineFrame->GetOffsetTo(mBlockFrame).x;
if(isRtlBlock == (frameXOffset >= curOffset)) {
x += inlineFrame->GetSize().width;
}
inlineFrame = inlineFrame->GetNextContinuation();
}
if (isRtlBlock) {
// aFrame itself is also to the right of its left edge, so add its width.
x += aFrame->GetSize().width;
// x is now the distance from the left edge of aFrame to the right edge
// of the unbroken content. Change it to indicate the distance from the
// left edge of the unbroken content to the left edge of aFrame.
x = mUnbrokenWidth - x;
}
} else {
x = mContinuationPoint;
}
// Assume background-origin: border and return a rect with offsets
// relative to (0,0). If we have a different background-origin,
// then our rect should be deflated appropriately by our caller.
return nsRect(-x, 0, mUnbrokenWidth, mFrame->GetSize().height);
}
nsRect GetBoundingRect(nsIFrame* aFrame)
{
SetFrame(aFrame);
// Move the offsets relative to (0,0) which puts the bounding box into
// our coordinate system rather than our parent's. We do this by
// moving it the back distance from us to the bounding box.
// This also assumes background-origin: border, so our caller will
// need to deflate us if needed.
nsRect boundingBox(mBoundingBox);
nsPoint point = mFrame->GetPosition();
boundingBox.MoveBy(-point.x, -point.y);
return boundingBox;
}
protected:
nsIFrame* mFrame;
nsBlockFrame* mBlockFrame;
nsRect mBoundingBox;
nscoord mContinuationPoint;
nscoord mUnbrokenWidth;
nscoord mLineContinuationPoint;
bool mBidiEnabled;
void SetFrame(nsIFrame* aFrame)
{
NS_PRECONDITION(aFrame, "Need a frame");
nsIFrame *prevContinuation = GetPrevContinuation(aFrame);
if (!prevContinuation || mFrame != prevContinuation) {
// Ok, we've got the wrong frame. We have to start from scratch.
Reset();
Init(aFrame);
return;
}
// Get our last frame's size and add its width to our continuation
// point before we cache the new frame.
mContinuationPoint += mFrame->GetSize().width;
// If this a new line, update mLineContinuationPoint.
if (mBidiEnabled &&
(aFrame->GetPrevInFlow() || !AreOnSameLine(mFrame, aFrame))) {
mLineContinuationPoint = mContinuationPoint;
}
mFrame = aFrame;
}
nsIFrame* GetPrevContinuation(nsIFrame* aFrame)
{
nsIFrame* prevCont = aFrame->GetPrevContinuation();
if (!prevCont && (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
nsIFrame* block = static_cast<nsIFrame*>
(aFrame->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
if (block) {
// The {ib} properties are only stored on first continuations
NS_ASSERTION(!block->GetPrevContinuation(),
"Incorrect value for IBSplitSpecialPrevSibling");
prevCont = static_cast<nsIFrame*>
(block->Properties().Get(nsIFrame::IBSplitSpecialPrevSibling()));
NS_ASSERTION(prevCont, "How did that happen?");
}
}
return prevCont;
}
nsIFrame* GetNextContinuation(nsIFrame* aFrame)
{
nsIFrame* nextCont = aFrame->GetNextContinuation();
if (!nextCont && (aFrame->GetStateBits() & NS_FRAME_IS_SPECIAL)) {
// The {ib} properties are only stored on first continuations
aFrame = aFrame->GetFirstContinuation();
nsIFrame* block = static_cast<nsIFrame*>
(aFrame->Properties().Get(nsIFrame::IBSplitSpecialSibling()));
if (block) {
nextCont = static_cast<nsIFrame*>
(block->Properties().Get(nsIFrame::IBSplitSpecialSibling()));
NS_ASSERTION(nextCont, "How did that happen?");
}
}
return nextCont;
}
void Init(nsIFrame* aFrame)
{
// Start with the previous flow frame as our continuation point
// is the total of the widths of the previous frames.
nsIFrame* inlineFrame = GetPrevContinuation(aFrame);
while (inlineFrame) {
nsRect rect = inlineFrame->GetRect();
mContinuationPoint += rect.width;
mUnbrokenWidth += rect.width;
mBoundingBox.UnionRect(mBoundingBox, rect);
inlineFrame = GetPrevContinuation(inlineFrame);
}
// Next add this frame and subsequent frames to the bounding box and
// unbroken width.
inlineFrame = aFrame;
while (inlineFrame) {
nsRect rect = inlineFrame->GetRect();
mUnbrokenWidth += rect.width;
mBoundingBox.UnionRect(mBoundingBox, rect);
inlineFrame = GetNextContinuation(inlineFrame);
}
mFrame = aFrame;
mBidiEnabled = aFrame->PresContext()->BidiEnabled();
if (mBidiEnabled) {
// Find the containing block frame
nsIFrame* frame = aFrame;
do {
frame = frame->GetParent();
mBlockFrame = do_QueryFrame(frame);
}
while (frame && frame->IsFrameOfType(nsIFrame::eLineParticipant));
NS_ASSERTION(mBlockFrame, "Cannot find containing block.");
mLineContinuationPoint = mContinuationPoint;
}
}
bool AreOnSameLine(nsIFrame* aFrame1, nsIFrame* aFrame2) {
bool isValid1, isValid2;
nsBlockInFlowLineIterator it1(mBlockFrame, aFrame1, &isValid1);
nsBlockInFlowLineIterator it2(mBlockFrame, aFrame2, &isValid2);
return isValid1 && isValid2 &&
// Make sure aFrame1 and aFrame2 are in the same continuation of
// mBlockFrame.
it1.GetContainer() == it2.GetContainer() &&
// And on the same line in it
it1.GetLine() == it2.GetLine();
}
};
struct GradientCacheKey : public PLDHashEntryHdr {
typedef const GradientCacheKey& KeyType;
typedef const GradientCacheKey* KeyTypePointer;
enum { ALLOW_MEMMOVE = true };
const nsRefPtr<nsStyleGradient> mGradient;
const gfxSize mGradientSize;
enum { SINGLE_CELL = 0x01 };
const uint32_t mFlags;
const gfx::BackendType mBackendType;
GradientCacheKey(nsStyleGradient* aGradient, const gfxSize& aGradientSize,
uint32_t aFlags, gfx::BackendType aBackendType)
: mGradient(aGradient), mGradientSize(aGradientSize), mFlags(aFlags),
mBackendType(aBackendType)
{ }
GradientCacheKey(const GradientCacheKey* aOther)
: mGradient(aOther->mGradient), mGradientSize(aOther->mGradientSize),
mFlags(aOther->mFlags), mBackendType(aOther->mBackendType)
{ }
static PLDHashNumber
HashKey(const KeyTypePointer aKey)
{
PLDHashNumber hash = 0;
hash = AddToHash(hash, aKey->mGradientSize.width);
hash = AddToHash(hash, aKey->mGradientSize.height);
hash = AddToHash(hash, aKey->mFlags);
hash = AddToHash(hash, aKey->mBackendType);
hash = aKey->mGradient->Hash(hash);
return hash;
}
bool KeyEquals(KeyTypePointer aKey) const
{
return (*aKey->mGradient == *mGradient) &&
(aKey->mGradientSize == mGradientSize) &&
(aKey->mBackendType == mBackendType) &&
(aKey->mFlags == mFlags);
}
static KeyTypePointer KeyToPointer(KeyType aKey)
{
return &aKey;
}
};
/**
* This class is what is cached. It need to be allocated in an object separated
* to the cache entry to be able to be tracked by the nsExpirationTracker.
* */
struct GradientCacheData {
GradientCacheData(gfxPattern* aPattern, bool aCoversTile,
const GradientCacheKey& aKey)
: mPattern(aPattern), mCoversTile(aCoversTile), mKey(aKey)
{}
GradientCacheData(const GradientCacheData& aOther)
: mPattern(aOther.mPattern),
mCoversTile(aOther.mCoversTile),
mKey(aOther.mKey)
{ }
nsExpirationState *GetExpirationState() {
return &mExpirationState;
}
nsExpirationState mExpirationState;
nsRefPtr<gfxPattern> mPattern;
bool mCoversTile;
GradientCacheKey mKey;
};
/**
* This class implements a cache with no maximum size, that retains the
* gfxPatterns used to draw the gradients.
*
* The key is the nsStyleGradient that defines the gradient, and the size of the
* gradient.
*
* The value is the gfxPattern, and whether or not we perform an optimization
* based on the actual gradient property.
*
* An entry stays in the cache as long as it is used often. As long as a cache
* entry is in the cache, all the references it has are guaranteed to be valid:
* the nsStyleRect for the key, the gfxPattern for the value.
*/
class GradientCache MOZ_FINAL : public nsExpirationTracker<GradientCacheData,4>
{
public:
GradientCache()
: nsExpirationTracker<GradientCacheData, 4>(MAX_GENERATION_MS)
{
mHashEntries.Init();
srand(time(nullptr));
mTimerPeriod = rand() % MAX_GENERATION_MS + 1;
Telemetry::Accumulate(Telemetry::GRADIENT_RETENTION_TIME, mTimerPeriod);
}
virtual void NotifyExpired(GradientCacheData* aObject)
{
// This will free the gfxPattern.
RemoveObject(aObject);
mHashEntries.Remove(aObject->mKey);
}
GradientCacheData* Lookup(nsStyleGradient* aKey, const gfxSize& aGradientSize,
uint32_t aFlags, gfx::BackendType aBackendType)
{
// We don't cache gradient that have Calc value, because the Calc object
// can be deallocated by the time we want to compute the hash, and thus we
// would have a dangling pointer in some nsStyleCoord in the
// nsStyleGradient that are in the hash table.
if (aKey->HasCalc()) {
return nullptr;
}
GradientCacheData* gradient =
mHashEntries.Get(GradientCacheKey(aKey, aGradientSize, aFlags, aBackendType));
if (gradient) {
MarkUsed(gradient);
}
return gradient;
}
// Returns true if we successfully register the gradient in the cache, false
// otherwise.
bool RegisterEntry(GradientCacheData* aValue)
{
// We don't cache gradient that have Calc values (see
// GradientCache::Lookup).
if (aValue->mKey.mGradient->HasCalc()) {
return false;
}
nsresult rv = AddObject(aValue);
if (NS_FAILED(rv)) {
// We are OOM, and we cannot track this object. We don't want stall
// entries in the hash table (since the expiration tracker is responsible
// for removing the cache entries), so we avoid putting that entry in the
// table, which is a good things considering we are short on memory
// anyway, we probably don't want to retain things.
return false;
}
mHashEntries.Put(aValue->mKey, aValue);
return true;
}
protected:
uint32_t mTimerPeriod;
static const uint32_t MAX_GENERATION_MS = 10000;
/**
* FIXME use nsTHashtable to avoid duplicating the GradientCacheKey.
* https://bugzilla.mozilla.org/show_bug.cgi?id=761393#c47
*/
nsClassHashtable<GradientCacheKey, GradientCacheData> mHashEntries;
};
/* Local functions */
static void DrawBorderImage(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
const nsRect& aDirtyRect);
static void DrawBorderImageComponent(nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
imgIContainer* aImage,
const nsRect& aDirtyRect,
const nsRect& aFill,
const nsIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
const nsStyleBorder& aStyleBorder,
uint8_t aIndex);
static nscolor MakeBevelColor(mozilla::css::Side whichSide, uint8_t style,
nscolor aBackgroundColor,
nscolor aBorderColor);
static InlineBackgroundData* gInlineBGData = nullptr;
static GradientCache* gGradientCache = nullptr;
// Initialize any static variables used by nsCSSRendering.
void nsCSSRendering::Init()
{
NS_ASSERTION(!gInlineBGData, "Init called twice");
gInlineBGData = new InlineBackgroundData();
gGradientCache = new GradientCache();
nsCSSBorderRenderer::Init();
}
// Clean up any global variables used by nsCSSRendering.
void nsCSSRendering::Shutdown()
{
delete gInlineBGData;
gInlineBGData = nullptr;
delete gGradientCache;
gGradientCache = nullptr;
nsCSSBorderRenderer::Shutdown();
}
/**
* Make a bevel color
*/
static nscolor
MakeBevelColor(mozilla::css::Side whichSide, uint8_t style,
nscolor aBackgroundColor, nscolor aBorderColor)
{
nscolor colors[2];
nscolor theColor;
// Given a background color and a border color
// calculate the color used for the shading
NS_GetSpecial3DColors(colors, aBackgroundColor, aBorderColor);
if ((style == NS_STYLE_BORDER_STYLE_OUTSET) ||
(style == NS_STYLE_BORDER_STYLE_RIDGE)) {
// Flip colors for these two border styles
switch (whichSide) {
case NS_SIDE_BOTTOM: whichSide = NS_SIDE_TOP; break;
case NS_SIDE_RIGHT: whichSide = NS_SIDE_LEFT; break;
case NS_SIDE_TOP: whichSide = NS_SIDE_BOTTOM; break;
case NS_SIDE_LEFT: whichSide = NS_SIDE_RIGHT; break;
}
}
switch (whichSide) {
case NS_SIDE_BOTTOM:
theColor = colors[1];
break;
case NS_SIDE_RIGHT:
theColor = colors[1];
break;
case NS_SIDE_TOP:
theColor = colors[0];
break;
case NS_SIDE_LEFT:
default:
theColor = colors[0];
break;
}
return theColor;
}
//----------------------------------------------------------------------
// Thebes Border Rendering Code Start
/*
* Compute the float-pixel radii that should be used for drawing
* this border/outline, given the various input bits.
*/
/* static */ void
nsCSSRendering::ComputePixelRadii(const nscoord *aAppUnitsRadii,
nscoord aAppUnitsPerPixel,
gfxCornerSizes *oBorderRadii)
{
gfxFloat radii[8];
NS_FOR_CSS_HALF_CORNERS(corner)
radii[corner] = gfxFloat(aAppUnitsRadii[corner]) / aAppUnitsPerPixel;
(*oBorderRadii)[C_TL] = gfxSize(radii[NS_CORNER_TOP_LEFT_X],
radii[NS_CORNER_TOP_LEFT_Y]);
(*oBorderRadii)[C_TR] = gfxSize(radii[NS_CORNER_TOP_RIGHT_X],
radii[NS_CORNER_TOP_RIGHT_Y]);
(*oBorderRadii)[C_BR] = gfxSize(radii[NS_CORNER_BOTTOM_RIGHT_X],
radii[NS_CORNER_BOTTOM_RIGHT_Y]);
(*oBorderRadii)[C_BL] = gfxSize(radii[NS_CORNER_BOTTOM_LEFT_X],
radii[NS_CORNER_BOTTOM_LEFT_Y]);
}
void
nsCSSRendering::PaintBorder(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aStyleContext,
int aSkipSides)
{
SAMPLE_LABEL("nsCSSRendering", "PaintBorder");
nsStyleContext *styleIfVisited = aStyleContext->GetStyleIfVisited();
const nsStyleBorder *styleBorder = aStyleContext->GetStyleBorder();
// Don't check RelevantLinkVisited here, since we want to take the
// same amount of time whether or not it's true.
if (!styleIfVisited) {
PaintBorderWithStyleBorder(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, *styleBorder,
aStyleContext, aSkipSides);
return;
}
nsStyleBorder newStyleBorder(*styleBorder);
// We're making an ephemeral stack copy here, so just copy this debug-only
// member to prevent assertions.
#ifdef DEBUG
newStyleBorder.mImageTracked = styleBorder->mImageTracked;
#endif
NS_FOR_CSS_SIDES(side) {
newStyleBorder.SetBorderColor(side,
aStyleContext->GetVisitedDependentColor(
nsCSSProps::SubpropertyEntryFor(eCSSProperty_border_color)[side]));
}
PaintBorderWithStyleBorder(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, newStyleBorder,
aStyleContext, aSkipSides);
#ifdef DEBUG
newStyleBorder.mImageTracked = false;
#endif
}
void
nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
nsStyleContext* aStyleContext,
int aSkipSides)
{
nsMargin border;
nscoord twipsRadii[8];
nsCompatibility compatMode = aPresContext->CompatibilityMode();
SN("++ PaintBorder");
// Check to see if we have an appearance defined. If so, we let the theme
// renderer draw the border. DO not get the data from aForFrame, since the passed in style context
// may be different! Always use |aStyleContext|!
const nsStyleDisplay* displayData = aStyleContext->GetStyleDisplay();
if (displayData->mAppearance) {
nsITheme *theme = aPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame, displayData->mAppearance))
return; // Let the theme handle it.
}
if (aStyleBorder.IsBorderImageLoaded()) {
DrawBorderImage(aPresContext, aRenderingContext, aForFrame,
aBorderArea, aStyleBorder, aDirtyRect);
return;
}
// Get our style context's color struct.
const nsStyleColor* ourColor = aStyleContext->GetStyleColor();
// in NavQuirks mode we want to use the parent's context as a starting point
// for determining the background color
nsIFrame* bgFrame = nsCSSRendering::FindNonTransparentBackgroundFrame
(aForFrame, compatMode == eCompatibility_NavQuirks ? true : false);
nsStyleContext* bgContext = bgFrame->GetStyleContext();
nscolor bgColor =
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
border = aStyleBorder.GetComputedBorder();
if ((0 == border.left) && (0 == border.right) &&
(0 == border.top) && (0 == border.bottom)) {
// Empty border area
return;
}
nsSize frameSize = aForFrame->GetSize();
if (&aStyleBorder == aForFrame->GetStyleBorder() &&
frameSize == aBorderArea.Size()) {
aForFrame->GetBorderRadii(twipsRadii);
} else {
nsIFrame::ComputeBorderRadii(aStyleBorder.mBorderRadius, frameSize,
aBorderArea.Size(), aSkipSides, twipsRadii);
}
// Turn off rendering for all of the zero sized sides
if (aSkipSides & SIDE_BIT_TOP) border.top = 0;
if (aSkipSides & SIDE_BIT_RIGHT) border.right = 0;
if (aSkipSides & SIDE_BIT_BOTTOM) border.bottom = 0;
if (aSkipSides & SIDE_BIT_LEFT) border.left = 0;
// get the inside and outside parts of the border
nsRect outerRect(aBorderArea);
SF(" outerRect: %d %d %d %d\n", outerRect.x, outerRect.y, outerRect.width, outerRect.height);
// we can assume that we're already clipped to aDirtyRect -- I think? (!?)
// Get our conversion values
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
// convert outer and inner rects
gfxRect oRect(nsLayoutUtils::RectToGfxRect(outerRect, twipsPerPixel));
// convert the border widths
gfxFloat borderWidths[4] = { gfxFloat(border.top / twipsPerPixel),
gfxFloat(border.right / twipsPerPixel),
gfxFloat(border.bottom / twipsPerPixel),
gfxFloat(border.left / twipsPerPixel) };
// convert the radii
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
uint8_t borderStyles[4];
nscolor borderColors[4];
nsBorderColors *compositeColors[4];
// pull out styles, colors, composite colors
NS_FOR_CSS_SIDES (i) {
bool foreground;
borderStyles[i] = aStyleBorder.GetBorderStyle(i);
aStyleBorder.GetBorderColor(i, borderColors[i], foreground);
aStyleBorder.GetCompositeColors(i, &compositeColors[i]);
if (foreground)
borderColors[i] = ourColor->mColor;
}
SF(" borderStyles: %d %d %d %d\n", borderStyles[0], borderStyles[1], borderStyles[2], borderStyles[3]);
// start drawing
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
#if 0
// this will draw a transparent red backround underneath the oRect area
ctx->Save();
ctx->Rectangle(oRect);
ctx->SetColor(gfxRGBA(1.0, 0.0, 0.0, 0.5));
ctx->Fill();
ctx->Restore();
#endif
//SF ("borderRadii: %f %f %f %f\n", borderRadii[0], borderRadii[1], borderRadii[2], borderRadii[3]);
nsCSSBorderRenderer br(twipsPerPixel,
ctx,
oRect,
borderStyles,
borderWidths,
borderRadii,
borderColors,
compositeColors,
aSkipSides,
bgColor);
br.DrawBorders();
ctx->Restore();
SN();
}
static nsRect
GetOutlineInnerRect(nsIFrame* aFrame)
{
nsRect* savedOutlineInnerRect = static_cast<nsRect*>
(aFrame->Properties().Get(nsIFrame::OutlineInnerRectProperty()));
if (savedOutlineInnerRect)
return *savedOutlineInnerRect;
// FIXME (bug 599652): We probably want something narrower than either
// overflow rect here, but for now use the visual overflow in order to
// be consistent with ComputeOutlineAndEffectsRect in nsFrame.cpp.
return aFrame->GetVisualOverflowRect();
}
void
nsCSSRendering::PaintOutline(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aStyleContext)
{
nscoord twipsRadii[8];
// Get our style context's color struct.
const nsStyleOutline* ourOutline = aStyleContext->GetStyleOutline();
nscoord width;
ourOutline->GetOutlineWidth(width);
if (width == 0) {
// Empty outline
return;
}
nsIFrame* bgFrame = nsCSSRendering::FindNonTransparentBackgroundFrame
(aForFrame, false);
nsStyleContext* bgContext = bgFrame->GetStyleContext();
nscolor bgColor =
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
// When the outline property is set on :-moz-anonymous-block or
// :-moz-anonyomus-positioned-block pseudo-elements, it inherited that
// outline from the inline that was broken because it contained a
// block. In that case, we don't want a really wide outline if the
// block inside the inline is narrow, so union the actual contents of
// the anonymous blocks.
nsIFrame *frameForArea = aForFrame;
do {
nsIAtom *pseudoType = frameForArea->GetStyleContext()->GetPseudo();
if (pseudoType != nsCSSAnonBoxes::mozAnonymousBlock &&
pseudoType != nsCSSAnonBoxes::mozAnonymousPositionedBlock)
break;
// If we're done, we really want it and all its later siblings.
frameForArea = frameForArea->GetFirstPrincipalChild();
NS_ASSERTION(frameForArea, "anonymous block with no children?");
} while (frameForArea);
nsRect innerRect; // relative to aBorderArea.TopLeft()
if (frameForArea == aForFrame) {
innerRect = GetOutlineInnerRect(aForFrame);
} else {
for (; frameForArea; frameForArea = frameForArea->GetNextSibling()) {
// The outline has already been included in aForFrame's overflow
// area, but not in those of its descendants, so we have to
// include it. Otherwise we'll end up drawing the outline inside
// the border.
nsRect r(GetOutlineInnerRect(frameForArea) +
frameForArea->GetOffsetTo(aForFrame));
innerRect.UnionRect(innerRect, r);
}
}
innerRect += aBorderArea.TopLeft();
nscoord offset = ourOutline->mOutlineOffset;
innerRect.Inflate(offset, offset);
// If the dirty rect is completely inside the border area (e.g., only the
// content is being painted), then we can skip out now
// XXX this isn't exactly true for rounded borders, where the inside curves may
// encroach into the content area. A safer calculation would be to
// shorten insideRect by the radius one each side before performing this test.
if (innerRect.Contains(aDirtyRect))
return;
nsRect outerRect = innerRect;
outerRect.Inflate(width, width);
// get the radius for our outline
nsIFrame::ComputeBorderRadii(ourOutline->mOutlineRadius, aBorderArea.Size(),
outerRect.Size(), 0, twipsRadii);
// Get our conversion values
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
// get the outer rectangles
gfxRect oRect(nsLayoutUtils::RectToGfxRect(outerRect, twipsPerPixel));
// convert the radii
nsMargin outlineMargin(width, width, width, width);
gfxCornerSizes outlineRadii;
ComputePixelRadii(twipsRadii, twipsPerPixel, &outlineRadii);
uint8_t outlineStyle = ourOutline->GetOutlineStyle();
uint8_t outlineStyles[4] = { outlineStyle,
outlineStyle,
outlineStyle,
outlineStyle };
// This handles treating the initial color as 'currentColor'; if we
// ever want 'invert' back we'll need to do a bit of work here too.
nscolor outlineColor =
aStyleContext->GetVisitedDependentColor(eCSSProperty_outline_color);
nscolor outlineColors[4] = { outlineColor,
outlineColor,
outlineColor,
outlineColor };
// convert the border widths
gfxFloat outlineWidths[4] = { gfxFloat(width / twipsPerPixel),
gfxFloat(width / twipsPerPixel),
gfxFloat(width / twipsPerPixel),
gfxFloat(width / twipsPerPixel) };
// start drawing
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
nsCSSBorderRenderer br(twipsPerPixel,
ctx,
oRect,
outlineStyles,
outlineWidths,
outlineRadii,
outlineColors,
nullptr, 0,
bgColor);
br.DrawBorders();
ctx->Restore();
SN();
}
void
nsCSSRendering::PaintFocus(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aFocusRect,
nscolor aColor)
{
nscoord oneCSSPixel = nsPresContext::CSSPixelsToAppUnits(1);
nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
gfxRect focusRect(nsLayoutUtils::RectToGfxRect(aFocusRect, oneDevPixel));
gfxCornerSizes focusRadii;
{
nscoord twipsRadii[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
ComputePixelRadii(twipsRadii, oneDevPixel, &focusRadii);
}
gfxFloat focusWidths[4] = { gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel) };
uint8_t focusStyles[4] = { NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED };
nscolor focusColors[4] = { aColor, aColor, aColor, aColor };
gfxContext *ctx = aRenderingContext.ThebesContext();
ctx->Save();
// Because this renders a dotted border, the background color
// should not be used. Therefore, we provide a value that will
// be blatantly wrong if it ever does get used. (If this becomes
// something that CSS can style, this function will then have access
// to a style context and can use the same logic that PaintBorder
// and PaintOutline do.)
nsCSSBorderRenderer br(oneDevPixel,
ctx,
focusRect,
focusStyles,
focusWidths,
focusRadii,
focusColors,
nullptr, 0,
NS_RGB(255, 0, 0));
br.DrawBorders();
ctx->Restore();
SN();
}
// Thebes Border Rendering Code End
//----------------------------------------------------------------------
//----------------------------------------------------------------------
/**
* Computes the placement of a background image.
*
* @param aOriginBounds is the box to which the tiling position should be
* relative
* This should correspond to 'background-origin' for the frame,
* except when painting on the canvas, in which case the origin bounds
* should be the bounds of the root element's frame.
* @param aTopLeft the top-left corner where an image tile should be drawn
* @param aAnchorPoint a point which should be pixel-aligned by
* nsLayoutUtils::DrawImage. This is the same as aTopLeft, unless CSS
* specifies a percentage (including 'right' or 'bottom'), in which case
* it's that percentage within of aOriginBounds. So 'right' would set
* aAnchorPoint.x to aOriginBounds.XMost().
*
* Points are returned relative to aOriginBounds.
*/
static void
ComputeBackgroundAnchorPoint(const nsStyleBackground::Layer& aLayer,
const nsSize& aOriginBounds,
const nsSize& aImageSize,
nsPoint* aTopLeft,
nsPoint* aAnchorPoint)
{
double percentX = aLayer.mPosition.mXPosition.mPercent;
nscoord lengthX = aLayer.mPosition.mXPosition.mLength;
aAnchorPoint->x = lengthX + NSToCoordRound(percentX*aOriginBounds.width);
aTopLeft->x = lengthX +
NSToCoordRound(percentX*(aOriginBounds.width - aImageSize.width));
double percentY = aLayer.mPosition.mYPosition.mPercent;
nscoord lengthY = aLayer.mPosition.mYPosition.mLength;
aAnchorPoint->y = lengthY + NSToCoordRound(percentY*aOriginBounds.height);
aTopLeft->y = lengthY +
NSToCoordRound(percentY*(aOriginBounds.height - aImageSize.height));
}
nsIFrame*
nsCSSRendering::FindNonTransparentBackgroundFrame(nsIFrame* aFrame,
bool aStartAtParent /*= false*/)
{
NS_ASSERTION(aFrame, "Cannot find NonTransparentBackgroundFrame in a null frame");
nsIFrame* frame = nullptr;
if (aStartAtParent) {
frame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
}
if (!frame) {
frame = aFrame;
}
while (frame) {
// No need to call GetVisitedDependentColor because it always uses
// this alpha component anyway.
if (NS_GET_A(frame->GetStyleBackground()->mBackgroundColor) > 0)
break;
if (frame->IsThemed())
break;
nsIFrame* parent = nsLayoutUtils::GetParentOrPlaceholderFor(frame);
if (!parent)
break;
frame = parent;
}
return frame;
}
// Returns true if aFrame is a canvas frame.
// We need to treat the viewport as canvas because, even though
// it does not actually paint a background, we need to get the right
// background style so we correctly detect transparent documents.
bool
nsCSSRendering::IsCanvasFrame(nsIFrame* aFrame)
{
nsIAtom* frameType = aFrame->GetType();
return frameType == nsGkAtoms::canvasFrame ||
frameType == nsGkAtoms::rootFrame ||
frameType == nsGkAtoms::pageContentFrame ||
frameType == nsGkAtoms::viewportFrame;
}
nsIFrame*
nsCSSRendering::FindBackgroundStyleFrame(nsIFrame* aForFrame)
{
const nsStyleBackground* result = aForFrame->GetStyleBackground();
// Check if we need to do propagation from BODY rather than HTML.
if (!result->IsTransparent()) {
return aForFrame;
}
nsIContent* content = aForFrame->GetContent();
// The root element content can't be null. We wouldn't know what
// frame to create for aFrame.
// Use |OwnerDoc| so it works during destruction.
if (!content) {
return aForFrame;
}
nsIDocument* document = content->OwnerDoc();
dom::Element* bodyContent = document->GetBodyElement();
// We need to null check the body node (bug 118829) since
// there are cases, thanks to the fix for bug 5569, where we
// will reflow a document with no body. In particular, if a
// SCRIPT element in the head blocks the parser and then has a
// SCRIPT that does "document.location.href = 'foo'", then
// nsParser::Terminate will call |DidBuildModel| methods
// through to the content sink, which will call |StartLayout|
// and thus |Initialize| on the pres shell. See bug 119351
// for the ugly details.
if (!bodyContent) {
return aForFrame;
}
nsIFrame *bodyFrame = bodyContent->GetPrimaryFrame();
if (!bodyFrame) {
return aForFrame;
}
return nsLayoutUtils::GetStyleFrame(bodyFrame);
}
/**
* |FindBackground| finds the correct style data to use to paint the
* background. It is responsible for handling the following two
* statements in section 14.2 of CSS2:
*
* The background of the box generated by the root element covers the
* entire canvas.
*
* For HTML documents, however, we recommend that authors specify the
* background for the BODY element rather than the HTML element. User
* agents should observe the following precedence rules to fill in the
* background: if the value of the 'background' property for the HTML
* element is different from 'transparent' then use it, else use the
* value of the 'background' property for the BODY element. If the
* resulting value is 'transparent', the rendering is undefined.
*
* Thus, in our implementation, it is responsible for ensuring that:
* + we paint the correct background on the |nsCanvasFrame|,
* |nsRootBoxFrame|, or |nsPageFrame|,
* + we don't paint the background on the root element, and
* + we don't paint the background on the BODY element in *some* cases,
* and for SGML-based HTML documents only.
*
* |FindBackground| returns true if a background should be painted, and
* the resulting style context to use for the background information
* will be filled in to |aBackground|.
*/
nsStyleContext*
nsCSSRendering::FindRootFrameBackground(nsIFrame* aForFrame)
{
return FindBackgroundStyleFrame(aForFrame)->GetStyleContext();
}
inline bool
FindElementBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame,
nsStyleContext** aBackgroundSC)
{
if (aForFrame == aRootElementFrame) {
// We must have propagated our background to the viewport or canvas. Abort.
return false;
}
*aBackgroundSC = aForFrame->GetStyleContext();
// Return true unless the frame is for a BODY element whose background
// was propagated to the viewport.
nsIContent* content = aForFrame->GetContent();
if (!content || content->Tag() != nsGkAtoms::body)
return true; // not frame for a "body" element
// It could be a non-HTML "body" element but that's OK, we'd fail the
// bodyContent check below
if (aForFrame->GetStyleContext()->GetPseudo())
return true; // A pseudo-element frame.
// We should only look at the <html> background if we're in an HTML document
nsIDocument* document = content->OwnerDoc();
dom::Element* bodyContent = document->GetBodyElement();
if (bodyContent != content)
return true; // this wasn't the background that was propagated
// This can be called even when there's no root element yet, during frame
// construction, via nsLayoutUtils::FrameHasTransparency and
// nsContainerFrame::SyncFrameViewProperties.
if (!aRootElementFrame)
return true;
const nsStyleBackground* htmlBG = aRootElementFrame->GetStyleBackground();
return !htmlBG->IsTransparent();
}
bool
nsCSSRendering::FindBackground(nsPresContext* aPresContext,
nsIFrame* aForFrame,
nsStyleContext** aBackgroundSC)
{
nsIFrame* rootElementFrame =
aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
if (IsCanvasFrame(aForFrame)) {
*aBackgroundSC = FindCanvasBackground(aForFrame, rootElementFrame);
return true;
} else {
return FindElementBackground(aForFrame, rootElementFrame, aBackgroundSC);
}
}
void
nsCSSRendering::DidPaint()
{
gInlineBGData->Reset();
}
void
nsCSSRendering::PaintBoxShadowOuter(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea,
const nsRect& aDirtyRect)
{
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
nsCSSShadowArray* shadows = styleBorder->mBoxShadow;
if (!shadows)
return;
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
bool hasBorderRadius;
bool nativeTheme; // mutually exclusive with hasBorderRadius
gfxCornerSizes borderRadii;
// Get any border radius, since box-shadow must also have rounded corners if the frame does
const nsStyleDisplay* styleDisplay = aForFrame->GetStyleDisplay();
nsITheme::Transparency transparency;
if (aForFrame->IsThemed(styleDisplay, &transparency)) {
// We don't respect border-radius for native-themed widgets
hasBorderRadius = false;
// For opaque (rectangular) theme widgets we can take the generic
// border-box path with border-radius disabled.
nativeTheme = transparency != nsITheme::eOpaque;
} else {
nativeTheme = false;
nscoord twipsRadii[8];
NS_ASSERTION(aFrameArea.Size() == aForFrame->GetSize(), "unexpected size");
hasBorderRadius = aForFrame->GetBorderRadii(twipsRadii);
if (hasBorderRadius) {
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
}
}
nsRect frameRect =
nativeTheme ? aForFrame->GetVisualOverflowRectRelativeToSelf() + aFrameArea.TopLeft() : aFrameArea;
gfxRect frameGfxRect(nsLayoutUtils::RectToGfxRect(frameRect, twipsPerPixel));
frameGfxRect.Round();
// We don't show anything that intersects with the frame we're blurring on. So tell the
// blurrer not to do unnecessary work there.
gfxRect skipGfxRect = frameGfxRect;
bool useSkipGfxRect = true;
if (nativeTheme) {
// Optimize non-leaf native-themed frames by skipping computing pixels
// in the padding-box. We assume the padding-box is going to be painted
// opaquely for non-leaf frames.
// XXX this may not be a safe assumption; we should make this go away
// by optimizing box-shadow drawing more for the cases where we don't have a skip-rect.
useSkipGfxRect = !aForFrame->IsLeaf();
nsRect paddingRect =
aForFrame->GetPaddingRect() - aForFrame->GetPosition() + aFrameArea.TopLeft();
skipGfxRect = nsLayoutUtils::RectToGfxRect(paddingRect, twipsPerPixel);
} else if (hasBorderRadius) {
skipGfxRect.Deflate(gfxMargin(
0, NS_MAX(borderRadii[C_TL].height, borderRadii[C_TR].height),
0, NS_MAX(borderRadii[C_BL].height, borderRadii[C_BR].height)));
}
for (uint32_t i = shadows->Length(); i > 0; --i) {
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
if (shadowItem->mInset)
continue;
nsRect shadowRect = frameRect;
shadowRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
nscoord pixelSpreadRadius;
if (nativeTheme) {
pixelSpreadRadius = shadowItem->mSpread;
} else {
shadowRect.Inflate(shadowItem->mSpread, shadowItem->mSpread);
pixelSpreadRadius = 0;
}
// shadowRect won't include the blur, so make an extra rect here that includes the blur
// for use in the even-odd rule below.
nsRect shadowRectPlusBlur = shadowRect;
nscoord blurRadius = shadowItem->mRadius;
shadowRectPlusBlur.Inflate(
nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, twipsPerPixel));
gfxRect shadowGfxRect =
nsLayoutUtils::RectToGfxRect(shadowRect, twipsPerPixel);
gfxRect shadowGfxRectPlusBlur =
nsLayoutUtils::RectToGfxRect(shadowRectPlusBlur, twipsPerPixel);
shadowGfxRect.Round();
shadowGfxRectPlusBlur.RoundOut();
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsContextBoxBlur blurringArea;
// When getting the widget shape from the native theme, we're going
// to draw the widget into the shadow surface to create a mask.
// We need to ensure that there actually *is* a shadow surface
// and that we're not going to draw directly into renderContext.
gfxContext* shadowContext =
blurringArea.Init(shadowRect, pixelSpreadRadius,
blurRadius, twipsPerPixel, renderContext, aDirtyRect,
useSkipGfxRect ? &skipGfxRect : nullptr,
nativeTheme ? nsContextBoxBlur::FORCE_MASK : 0);
if (!shadowContext)
continue;
// shadowContext is owned by either blurringArea or aRenderingContext.
MOZ_ASSERT(shadowContext == renderContext ||
shadowContext == blurringArea.GetContext());
// Set the shadow color; if not specified, use the foreground color
nscolor shadowColor;
if (shadowItem->mHasColor)
shadowColor = shadowItem->mColor;
else
shadowColor = aForFrame->GetStyleColor()->mColor;
renderContext->Save();
renderContext->SetColor(gfxRGBA(shadowColor));
// Draw the shape of the frame so it can be blurred. Recall how nsContextBoxBlur
// doesn't make any temporary surfaces if blur is 0 and it just returns the original
// surface? If we have no blur, we're painting this fill on the actual content surface
// (renderContext == shadowContext) which is why we set up the color and clip
// before doing this.
if (nativeTheme) {
// We don't clip the border-box from the shadow, nor any other box.
// We assume that the native theme is going to paint over the shadow.
// Draw the widget shape
gfxContextMatrixAutoSaveRestore save(shadowContext);
nsRefPtr<nsRenderingContext> wrapperCtx = new nsRenderingContext();
wrapperCtx->Init(aPresContext->DeviceContext(), shadowContext);
wrapperCtx->Translate(nsPoint(shadowItem->mXOffset,
shadowItem->mYOffset));
nsRect nativeRect;
nativeRect.IntersectRect(frameRect, aDirtyRect);
aPresContext->GetTheme()->DrawWidgetBackground(wrapperCtx, aForFrame,
styleDisplay->mAppearance, aFrameArea, nativeRect);
} else {
// Clip out the area of the actual frame so the shadow is not shown within
// the frame
renderContext->NewPath();
renderContext->Rectangle(shadowGfxRectPlusBlur);
if (hasBorderRadius) {
renderContext->RoundedRectangle(frameGfxRect, borderRadii);
} else {
renderContext->Rectangle(frameGfxRect);
}
renderContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
renderContext->Clip();
shadowContext->NewPath();
if (hasBorderRadius) {
gfxCornerSizes clipRectRadii;
gfxFloat spreadDistance = shadowItem->mSpread / twipsPerPixel;
gfxFloat borderSizes[4];
borderSizes[NS_SIDE_LEFT] = spreadDistance;
borderSizes[NS_SIDE_TOP] = spreadDistance;
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
nsCSSBorderRenderer::ComputeOuterRadii(borderRadii, borderSizes,
&clipRectRadii);
shadowContext->RoundedRectangle(shadowGfxRect, clipRectRadii);
} else {
shadowContext->Rectangle(shadowGfxRect);
}
shadowContext->Fill();
}
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBoxShadowInner(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea,
const nsRect& aDirtyRect)
{
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
nsCSSShadowArray* shadows = styleBorder->mBoxShadow;
if (!shadows)
return;
if (aForFrame->IsThemed() && aForFrame->GetContent() &&
!nsContentUtils::IsChromeDoc(aForFrame->GetContent()->GetCurrentDoc())) {
// There's no way of getting hold of a shape corresponding to a
// "padding-box" for native-themed widgets, so just don't draw
// inner box-shadows for them. But we allow chrome to paint inner
// box shadows since chrome can be aware of the platform theme.
return;
}
// Get any border radius, since box-shadow must also have rounded corners
// if the frame does.
nscoord twipsRadii[8];
NS_ASSERTION(aForFrame->GetType() == nsGkAtoms::fieldSetFrame ||
aFrameArea.Size() == aForFrame->GetSize(), "unexpected size");
bool hasBorderRadius = aForFrame->GetBorderRadii(twipsRadii);
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
nsRect paddingRect = aFrameArea;
nsMargin border = aForFrame->GetUsedBorder();
aForFrame->ApplySkipSides(border);
paddingRect.Deflate(border);
gfxCornerSizes innerRadii;
if (hasBorderRadius) {
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, twipsPerPixel, &borderRadii);
gfxFloat borderSizes[4] = {
gfxFloat(border.top / twipsPerPixel),
gfxFloat(border.right / twipsPerPixel),
gfxFloat(border.bottom / twipsPerPixel),
gfxFloat(border.left / twipsPerPixel)
};
nsCSSBorderRenderer::ComputeInnerRadii(borderRadii, borderSizes,
&innerRadii);
}
for (uint32_t i = shadows->Length(); i > 0; --i) {
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
if (!shadowItem->mInset)
continue;
/*
* shadowRect: the frame's padding rect
* shadowPaintRect: the area to paint on the temp surface, larger than shadowRect
* so that blurs still happen properly near the edges
* shadowClipRect: the area on the temporary surface within shadowPaintRect
* that we will NOT paint in
*/
nscoord blurRadius = shadowItem->mRadius;
nsMargin blurMargin =
nsContextBoxBlur::GetBlurRadiusMargin(blurRadius, twipsPerPixel);
nsRect shadowPaintRect = paddingRect;
shadowPaintRect.Inflate(blurMargin);
nsRect shadowClipRect = paddingRect;
shadowClipRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
shadowClipRect.Deflate(shadowItem->mSpread, shadowItem->mSpread);
gfxCornerSizes clipRectRadii;
if (hasBorderRadius) {
// Calculate the radii the inner clipping rect will have
gfxFloat spreadDistance = shadowItem->mSpread / twipsPerPixel;
gfxFloat borderSizes[4] = {0, 0, 0, 0};
// See PaintBoxShadowOuter and bug 514670
if (innerRadii[C_TL].width > 0 || innerRadii[C_BL].width > 0) {
borderSizes[NS_SIDE_LEFT] = spreadDistance;
}
if (innerRadii[C_TL].height > 0 || innerRadii[C_TR].height > 0) {
borderSizes[NS_SIDE_TOP] = spreadDistance;
}
if (innerRadii[C_TR].width > 0 || innerRadii[C_BR].width > 0) {
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
}
if (innerRadii[C_BL].height > 0 || innerRadii[C_BR].height > 0) {
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
}
nsCSSBorderRenderer::ComputeInnerRadii(innerRadii, borderSizes,
&clipRectRadii);
}
// Set the "skip rect" to the area within the frame that we don't paint in,
// including after blurring.
nsRect skipRect = shadowClipRect;
skipRect.Deflate(blurMargin);
gfxRect skipGfxRect = nsLayoutUtils::RectToGfxRect(skipRect, twipsPerPixel);
if (hasBorderRadius) {
skipGfxRect.Deflate(
gfxMargin(0, NS_MAX(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height),
0, NS_MAX(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height)));
}
// When there's a blur radius, gfxAlphaBoxBlur leaves the skiprect area
// unchanged. And by construction the gfxSkipRect is not touched by the
// rendered shadow (even after blurring), so those pixels must be completely
// transparent in the shadow, so drawing them changes nothing.
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsContextBoxBlur blurringArea;
gfxContext* shadowContext =
blurringArea.Init(shadowPaintRect, 0, blurRadius, twipsPerPixel,
renderContext, aDirtyRect, &skipGfxRect);
if (!shadowContext)
continue;
// shadowContext is owned by either blurringArea or aRenderingContext.
MOZ_ASSERT(shadowContext == renderContext ||
shadowContext == blurringArea.GetContext());
// Set the shadow color; if not specified, use the foreground color
nscolor shadowColor;
if (shadowItem->mHasColor)
shadowColor = shadowItem->mColor;
else
shadowColor = aForFrame->GetStyleColor()->mColor;
renderContext->Save();
renderContext->SetColor(gfxRGBA(shadowColor));
// Clip the context to the area of the frame's padding rect, so no part of the
// shadow is painted outside. Also cut out anything beyond where the inset shadow
// will be.
gfxRect shadowGfxRect =
nsLayoutUtils::RectToGfxRect(paddingRect, twipsPerPixel);
shadowGfxRect.Round();
renderContext->NewPath();
if (hasBorderRadius)
renderContext->RoundedRectangle(shadowGfxRect, innerRadii, false);
else
renderContext->Rectangle(shadowGfxRect);
renderContext->Clip();
// Fill the surface minus the area within the frame that we should
// not paint in, and blur and apply it.
gfxRect shadowPaintGfxRect =
nsLayoutUtils::RectToGfxRect(shadowPaintRect, twipsPerPixel);
shadowPaintGfxRect.RoundOut();
gfxRect shadowClipGfxRect =
nsLayoutUtils::RectToGfxRect(shadowClipRect, twipsPerPixel);
shadowClipGfxRect.Round();
shadowContext->NewPath();
shadowContext->Rectangle(shadowPaintGfxRect);
if (hasBorderRadius)
shadowContext->RoundedRectangle(shadowClipGfxRect, clipRectRadii, false);
else
shadowContext->Rectangle(shadowClipGfxRect);
shadowContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
shadowContext->Fill();
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBackground(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
uint32_t aFlags,
nsRect* aBGClipRect,
int32_t aLayer)
{
SAMPLE_LABEL("nsCSSRendering", "PaintBackground");
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
nsStyleContext *sc;
if (!FindBackground(aPresContext, aForFrame, &sc)) {
// We don't want to bail out if moz-appearance is set on a root
// node. If it has a parent content node, bail because it's not
// a root, other wise keep going in order to let the theme stuff
// draw the background. The canvas really should be drawing the
// bg, but there's no way to hook that up via css.
if (!aForFrame->GetStyleDisplay()->mAppearance) {
return;
}
nsIContent* content = aForFrame->GetContent();
if (!content || content->GetParent()) {
return;
}
sc = aForFrame->GetStyleContext();
}
PaintBackgroundWithSC(aPresContext, aRenderingContext, aForFrame,
aDirtyRect, aBorderArea, sc,
*aForFrame->GetStyleBorder(), aFlags,
aBGClipRect, aLayer);
}
static bool
IsOpaqueBorderEdge(const nsStyleBorder& aBorder, mozilla::css::Side aSide)
{
if (aBorder.GetComputedBorder().Side(aSide) == 0)
return true;
switch (aBorder.GetBorderStyle(aSide)) {
case NS_STYLE_BORDER_STYLE_SOLID:
case NS_STYLE_BORDER_STYLE_GROOVE:
case NS_STYLE_BORDER_STYLE_RIDGE:
case NS_STYLE_BORDER_STYLE_INSET:
case NS_STYLE_BORDER_STYLE_OUTSET:
break;
default:
return false;
}
// If we're using a border image, assume it's not fully opaque,
// because we may not even have the image loaded at this point, and
// even if we did, checking whether the relevant tile is fully
// opaque would be too much work.
if (aBorder.GetBorderImage())
return false;
nscolor color;
bool isForeground;
aBorder.GetBorderColor(aSide, color, isForeground);
// We don't know the foreground color here, so if it's being used
// we must assume it might be transparent.
if (isForeground)
return false;
return NS_GET_A(color) == 255;
}
/**
* Returns true if all border edges are either missing or opaque.
*/
static bool
IsOpaqueBorder(const nsStyleBorder& aBorder)
{
if (aBorder.mBorderColors)
return false;
NS_FOR_CSS_SIDES(i) {
if (!IsOpaqueBorderEdge(aBorder, i))
return false;
}
return true;
}
static inline void
SetupDirtyRects(const nsRect& aBGClipArea, const nsRect& aCallerDirtyRect,
nscoord aAppUnitsPerPixel,
/* OUT: */
nsRect* aDirtyRect, gfxRect* aDirtyRectGfx)
{
aDirtyRect->IntersectRect(aBGClipArea, aCallerDirtyRect);
// Compute the Thebes equivalent of the dirtyRect.
*aDirtyRectGfx = nsLayoutUtils::RectToGfxRect(*aDirtyRect, aAppUnitsPerPixel);
NS_WARN_IF_FALSE(aDirtyRect->IsEmpty() || !aDirtyRectGfx->IsEmpty(),
"converted dirty rect should not be empty");
NS_ABORT_IF_FALSE(!aDirtyRect->IsEmpty() || aDirtyRectGfx->IsEmpty(),
"second should be empty if first is");
}
struct BackgroundClipState {
nsRect mBGClipArea;
nsRect mDirtyRect;
gfxRect mDirtyRectGfx;
gfxCornerSizes mClippedRadii;
bool mRadiiAreOuter;
// Whether we are being asked to draw with a caller provided background
// clipping area. If this is true we also disable rounded corners.
bool mCustomClip;
};
static void
GetBackgroundClip(gfxContext *aCtx, uint8_t aBackgroundClip,
nsIFrame* aForFrame, const nsRect& aBorderArea,
const nsRect& aCallerDirtyRect, bool aHaveRoundedCorners,
const gfxCornerSizes& aBGRadii, nscoord aAppUnitsPerPixel,
/* out */ BackgroundClipState* aClipState)
{
aClipState->mBGClipArea = aBorderArea;
aClipState->mCustomClip = false;
aClipState->mRadiiAreOuter = true;
aClipState->mClippedRadii = aBGRadii;
if (aBackgroundClip != NS_STYLE_BG_CLIP_BORDER) {
nsMargin border = aForFrame->GetUsedBorder();
if (aBackgroundClip == NS_STYLE_BG_CLIP_MOZ_ALMOST_PADDING) {
// Reduce |border| by 1px (device pixels) on all sides, if
// possible, so that we don't get antialiasing seams between the
// background and border.
border.top = NS_MAX(0, border.top - aAppUnitsPerPixel);
border.right = NS_MAX(0, border.right - aAppUnitsPerPixel);
border.bottom = NS_MAX(0, border.bottom - aAppUnitsPerPixel);
border.left = NS_MAX(0, border.left - aAppUnitsPerPixel);
} else if (aBackgroundClip != NS_STYLE_BG_CLIP_PADDING) {
NS_ASSERTION(aBackgroundClip == NS_STYLE_BG_CLIP_CONTENT,
"unexpected background-clip");
border += aForFrame->GetUsedPadding();
}
aForFrame->ApplySkipSides(border);
aClipState->mBGClipArea.Deflate(border);
if (aHaveRoundedCorners) {
gfxFloat borderSizes[4] = {
gfxFloat(border.top / aAppUnitsPerPixel),
gfxFloat(border.right / aAppUnitsPerPixel),
gfxFloat(border.bottom / aAppUnitsPerPixel),
gfxFloat(border.left / aAppUnitsPerPixel)
};
nsCSSBorderRenderer::ComputeInnerRadii(aBGRadii, borderSizes,
&aClipState->mClippedRadii);
aClipState->mRadiiAreOuter = false;
}
}
SetupDirtyRects(aClipState->mBGClipArea, aCallerDirtyRect, aAppUnitsPerPixel,
&aClipState->mDirtyRect, &aClipState->mDirtyRectGfx);
}
static void
SetupBackgroundClip(BackgroundClipState& aClipState, gfxContext *aCtx,
bool aHaveRoundedCorners, nscoord aAppUnitsPerPixel,
gfxContextAutoSaveRestore* aAutoSR)
{
if (aClipState.mDirtyRectGfx.IsEmpty()) {
// Our caller won't draw anything under this condition, so no need
// to set more up.
return;
}
if (aClipState.mCustomClip) {
// We don't support custom clips and rounded corners, arguably a bug, but
// table painting seems to depend on it.
return;
}
// If we have rounded corners, clip all subsequent drawing to the
// rounded rectangle defined by bgArea and bgRadii (we don't know
// whether the rounded corners intrude on the dirtyRect or not).
// Do not do this if we have a caller-provided clip rect --
// as above with bgArea, arguably a bug, but table painting seems
// to depend on it.
if (aHaveRoundedCorners) {
gfxRect bgAreaGfx =
nsLayoutUtils::RectToGfxRect(aClipState.mBGClipArea, aAppUnitsPerPixel);
bgAreaGfx.Round();
bgAreaGfx.Condition();
if (bgAreaGfx.IsEmpty()) {
// I think it's become possible to hit this since
// http://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
NS_WARNING("converted background area should not be empty");
// Make our caller not do anything.
aClipState.mDirtyRectGfx.SizeTo(gfxSize(0.0, 0.0));
return;
}
aAutoSR->Reset(aCtx);
aCtx->NewPath();
aCtx->RoundedRectangle(bgAreaGfx, aClipState.mClippedRadii, aClipState.mRadiiAreOuter);
aCtx->Clip();
}
}
static void
DrawBackgroundColor(BackgroundClipState& aClipState, gfxContext *aCtx,
bool aHaveRoundedCorners, nscoord aAppUnitsPerPixel)
{
if (aClipState.mDirtyRectGfx.IsEmpty()) {
// Our caller won't draw anything under this condition, so no need
// to set more up.
return;
}
// We don't support custom clips and rounded corners, arguably a bug, but
// table painting seems to depend on it.
if (!aHaveRoundedCorners || aClipState.mCustomClip) {
aCtx->NewPath();
aCtx->Rectangle(aClipState.mDirtyRectGfx, true);
aCtx->Fill();
return;
}
gfxRect bgAreaGfx =
nsLayoutUtils::RectToGfxRect(aClipState.mBGClipArea, aAppUnitsPerPixel);
bgAreaGfx.Round();
bgAreaGfx.Condition();
if (bgAreaGfx.IsEmpty()) {
// I think it's become possible to hit this since
// http://hg.mozilla.org/mozilla-central/rev/50e934e4979b landed.
NS_WARNING("converted background area should not be empty");
// Make our caller not do anything.
aClipState.mDirtyRectGfx.SizeTo(gfxSize(0.0, 0.0));
return;
}
aCtx->Save();
gfxRect dirty = bgAreaGfx.Intersect(aClipState.mDirtyRectGfx);
aCtx->NewPath();
aCtx->Rectangle(dirty, true);
aCtx->Clip();
aCtx->NewPath();
aCtx->RoundedRectangle(bgAreaGfx, aClipState.mClippedRadii,
aClipState.mRadiiAreOuter);
aCtx->Fill();
aCtx->Restore();
}
nscolor
nsCSSRendering::DetermineBackgroundColor(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsIFrame* aFrame,
bool& aDrawBackgroundImage,
bool& aDrawBackgroundColor)
{
aDrawBackgroundImage = true;
aDrawBackgroundColor = true;
if (aFrame->HonorPrintBackgroundSettings()) {
aDrawBackgroundImage = aPresContext->GetBackgroundImageDraw();
aDrawBackgroundColor = aPresContext->GetBackgroundColorDraw();
}
nscolor bgColor;
if (aDrawBackgroundColor) {
bgColor =
aStyleContext->GetVisitedDependentColor(eCSSProperty_background_color);
if (NS_GET_A(bgColor) == 0)
aDrawBackgroundColor = false;
} else {
// If GetBackgroundColorDraw() is false, we are still expected to
// draw color in the background of any frame that's not completely
// transparent, but we are expected to use white instead of whatever
// color was specified.
bgColor = NS_RGB(255, 255, 255);
if (aDrawBackgroundImage ||
!aStyleContext->GetStyleBackground()->IsTransparent())
aDrawBackgroundColor = true;
else
bgColor = NS_RGBA(0,0,0,0);
}
const nsStyleBackground *bg = aStyleContext->GetStyleBackground();
// We can skip painting the background color if a background image is opaque.
if (aDrawBackgroundColor &&
bg->BottomLayer().mRepeat.mXRepeat == NS_STYLE_BG_REPEAT_REPEAT &&
bg->BottomLayer().mRepeat.mYRepeat == NS_STYLE_BG_REPEAT_REPEAT &&
bg->BottomLayer().mImage.IsOpaque()) {
aDrawBackgroundColor = false;
}
return bgColor;
}
static gfxFloat
ConvertGradientValueToPixels(const nsStyleCoord& aCoord,
gfxFloat aFillLength,
int32_t aAppUnitsPerPixel)
{
switch (aCoord.GetUnit()) {
case eStyleUnit_Percent:
return aCoord.GetPercentValue() * aFillLength;
case eStyleUnit_Coord:
return NSAppUnitsToFloatPixels(aCoord.GetCoordValue(), aAppUnitsPerPixel);
case eStyleUnit_Calc: {
const nsStyleCoord::Calc *calc = aCoord.GetCalcValue();
return calc->mPercent * aFillLength +
NSAppUnitsToFloatPixels(calc->mLength, aAppUnitsPerPixel);
}
default:
NS_WARNING("Unexpected coord unit");
return 0;
}
}
// Given a box with size aBoxSize and origin (0,0), and an angle aAngle,
// and a starting point for the gradient line aStart, find the endpoint of
// the gradient line --- the intersection of the gradient line with a line
// perpendicular to aAngle that passes through the farthest corner in the
// direction aAngle.
static gfxPoint
ComputeGradientLineEndFromAngle(const gfxPoint& aStart,
double aAngle,
const gfxSize& aBoxSize)
{
double dx = cos(-aAngle);
double dy = sin(-aAngle);
gfxPoint farthestCorner(dx > 0 ? aBoxSize.width : 0,
dy > 0 ? aBoxSize.height : 0);
gfxPoint delta = farthestCorner - aStart;
double u = delta.x*dy - delta.y*dx;
return farthestCorner + gfxPoint(-u*dy, u*dx);
}
// Compute the start and end points of the gradient line for a linear gradient.
static void
ComputeLinearGradientLine(nsPresContext* aPresContext,
nsStyleGradient* aGradient,
const gfxSize& aBoxSize,
gfxPoint* aLineStart,
gfxPoint* aLineEnd)
{
if (aGradient->mBgPosX.GetUnit() == eStyleUnit_None) {
double angle;
if (aGradient->mAngle.IsAngleValue()) {
angle = aGradient->mAngle.GetAngleValueInRadians();
if (!aGradient->mLegacySyntax) {
angle = M_PI_2 - angle;
}
} else {
angle = -M_PI_2; // defaults to vertical gradient starting from top
}
gfxPoint center(aBoxSize.width/2, aBoxSize.height/2);
*aLineEnd = ComputeGradientLineEndFromAngle(center, angle, aBoxSize);
*aLineStart = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineEnd;
} else if (!aGradient->mLegacySyntax) {
float xSign = aGradient->mBgPosX.GetPercentValue() * 2 - 1;
float ySign = 1 - aGradient->mBgPosY.GetPercentValue() * 2;
double angle = atan2(ySign * aBoxSize.width, xSign * aBoxSize.height);
gfxPoint center(aBoxSize.width/2, aBoxSize.height/2);
*aLineEnd = ComputeGradientLineEndFromAngle(center, angle, aBoxSize);
*aLineStart = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineEnd;
} else {
int32_t appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
*aLineStart = gfxPoint(
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
appUnitsPerPixel),
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
appUnitsPerPixel));
if (aGradient->mAngle.IsAngleValue()) {
MOZ_ASSERT(aGradient->mLegacySyntax);
double angle = aGradient->mAngle.GetAngleValueInRadians();
*aLineEnd = ComputeGradientLineEndFromAngle(*aLineStart, angle, aBoxSize);
} else {
// No angle, the line end is just the reflection of the start point
// through the center of the box
*aLineEnd = gfxPoint(aBoxSize.width, aBoxSize.height) - *aLineStart;
}
}
}
// Compute the start and end points of the gradient line for a radial gradient.
// Also returns the horizontal and vertical radii defining the circle or
// ellipse to use.
static void
ComputeRadialGradientLine(nsPresContext* aPresContext,
nsStyleGradient* aGradient,
const gfxSize& aBoxSize,
gfxPoint* aLineStart,
gfxPoint* aLineEnd,
double* aRadiusX,
double* aRadiusY)
{
if (aGradient->mBgPosX.GetUnit() == eStyleUnit_None) {
// Default line start point is the center of the box
*aLineStart = gfxPoint(aBoxSize.width/2, aBoxSize.height/2);
} else {
int32_t appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
*aLineStart = gfxPoint(
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
appUnitsPerPixel),
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
appUnitsPerPixel));
}
// Compute gradient shape: the x and y radii of an ellipse.
double radiusX, radiusY;
double leftDistance = NS_ABS(aLineStart->x);
double rightDistance = NS_ABS(aBoxSize.width - aLineStart->x);
double topDistance = NS_ABS(aLineStart->y);
double bottomDistance = NS_ABS(aBoxSize.height - aLineStart->y);
switch (aGradient->mSize) {
case NS_STYLE_GRADIENT_SIZE_CLOSEST_SIDE:
radiusX = NS_MIN(leftDistance, rightDistance);
radiusY = NS_MIN(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_MIN(radiusX, radiusY);
}
break;
case NS_STYLE_GRADIENT_SIZE_CLOSEST_CORNER: {
// Compute x and y distances to nearest corner
double offsetX = NS_MIN(leftDistance, rightDistance);
double offsetY = NS_MIN(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_hypot(offsetX, offsetY);
} else {
// maintain aspect ratio
radiusX = offsetX*M_SQRT2;
radiusY = offsetY*M_SQRT2;
}
break;
}
case NS_STYLE_GRADIENT_SIZE_FARTHEST_SIDE:
radiusX = NS_MAX(leftDistance, rightDistance);
radiusY = NS_MAX(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_MAX(radiusX, radiusY);
}
break;
case NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER: {
// Compute x and y distances to nearest corner
double offsetX = NS_MAX(leftDistance, rightDistance);
double offsetY = NS_MAX(topDistance, bottomDistance);
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_CIRCULAR) {
radiusX = radiusY = NS_hypot(offsetX, offsetY);
} else {
// maintain aspect ratio
radiusX = offsetX*M_SQRT2;
radiusY = offsetY*M_SQRT2;
}
break;
}
case NS_STYLE_GRADIENT_SIZE_EXPLICIT_SIZE: {
int32_t appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
radiusX = ConvertGradientValueToPixels(aGradient->mRadiusX,
aBoxSize.width, appUnitsPerPixel);
radiusY = ConvertGradientValueToPixels(aGradient->mRadiusY,
aBoxSize.height, appUnitsPerPixel);
break;
}
default:
radiusX = radiusY = 0;
NS_ABORT_IF_FALSE(false, "unknown radial gradient sizing method");
}
*aRadiusX = radiusX;
*aRadiusY = radiusY;
double angle;
if (aGradient->mAngle.IsAngleValue()) {
angle = aGradient->mAngle.GetAngleValueInRadians();
} else {
// Default angle is 0deg
angle = 0.0;
}
// The gradient line end point is where the gradient line intersects
// the ellipse.
*aLineEnd = *aLineStart + gfxPoint(radiusX*cos(-angle), radiusY*sin(-angle));
}
// A resolved color stop --- with a specific position along the gradient line,
// and a Thebes color
struct ColorStop {
ColorStop(double aPosition, nscolor aColor) :
mPosition(aPosition), mColor(aColor) {}
double mPosition; // along the gradient line; 0=start, 1=end
gfxRGBA mColor;
};
// Returns aFrac*aC2 + (1 - aFrac)*C1. The interpolation is done
// in unpremultiplied space, which is what SVG gradients and cairo
// gradients expect.
static gfxRGBA
InterpolateColor(const gfxRGBA& aC1, const gfxRGBA& aC2, double aFrac)
{
double other = 1 - aFrac;
return gfxRGBA(aC2.r*aFrac + aC1.r*other,
aC2.g*aFrac + aC1.g*other,
aC2.b*aFrac + aC1.b*other,
aC2.a*aFrac + aC1.a*other);
}
static nscoord
FindTileStart(nscoord aDirtyCoord, nscoord aTilePos, nscoord aTileDim)
{
NS_ASSERTION(aTileDim > 0, "Non-positive tile dimension");
double multiples = floor(double(aDirtyCoord - aTilePos)/aTileDim);
return NSToCoordRound(multiples*aTileDim + aTilePos);
}
void
nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsStyleGradient* aGradient,
const nsRect& aDirtyRect,
const nsRect& aOneCellArea,
const nsRect& aFillArea)
{
SAMPLE_LABEL("nsCSSRendering", "PaintGradient");
Telemetry::AutoTimer<Telemetry::GRADIENT_DURATION, Telemetry::Microsecond> gradientTimer;
if (aOneCellArea.IsEmpty())
return;
gfxContext *ctx = aRenderingContext.ThebesContext();
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
gfxRect oneCellArea =
nsLayoutUtils::RectToGfxRect(aOneCellArea, appUnitsPerPixel);
bool gradientRegistered = true;
uint32_t flags = 0;
if (aOneCellArea.Contains(aFillArea)) {
flags |= GradientCacheKey::SINGLE_CELL;
}
gfx::BackendType backendType = gfx::BACKEND_NONE;
if (ctx->IsCairo()) {
backendType = gfx::BACKEND_CAIRO;
} else {
gfx::DrawTarget* dt = ctx->GetDrawTarget();
NS_ASSERTION(dt, "If we are not using Cairo, we should have a draw target.");
backendType = dt->GetType();
}
GradientCacheData* pattern =
gGradientCache->Lookup(aGradient, oneCellArea.Size(), flags, backendType);
if (pattern == nullptr) {
// Compute "gradient line" start and end relative to oneCellArea
gfxPoint lineStart, lineEnd;
double radiusX = 0, radiusY = 0; // for radial gradients only
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
ComputeLinearGradientLine(aPresContext, aGradient, oneCellArea.Size(),
&lineStart, &lineEnd);
} else {
ComputeRadialGradientLine(aPresContext, aGradient, oneCellArea.Size(),
&lineStart, &lineEnd, &radiusX, &radiusY);
}
gfxFloat lineLength = NS_hypot(lineEnd.x - lineStart.x,
lineEnd.y - lineStart.y);
NS_ABORT_IF_FALSE(aGradient->mStops.Length() >= 2,
"The parser should reject gradients with less than two stops");
// Build color stop array and compute stop positions
nsTArray<ColorStop> stops;
// If there is a run of stops before stop i that did not have specified
// positions, then this is the index of the first stop in that run, otherwise
// it's -1.
int32_t firstUnsetPosition = -1;
for (uint32_t i = 0; i < aGradient->mStops.Length(); ++i) {
const nsStyleGradientStop& stop = aGradient->mStops[i];
double position;
switch (stop.mLocation.GetUnit()) {
case eStyleUnit_None:
if (i == 0) {
// First stop defaults to position 0.0
position = 0.0;
} else if (i == aGradient->mStops.Length() - 1) {
// Last stop defaults to position 1.0
position = 1.0;
} else {
// Other stops with no specified position get their position assigned
// later by interpolation, see below.
// Remeber where the run of stops with no specified position starts,
// if it starts here.
if (firstUnsetPosition < 0) {
firstUnsetPosition = i;
}
stops.AppendElement(ColorStop(0, stop.mColor));
continue;
}
break;
case eStyleUnit_Percent:
position = stop.mLocation.GetPercentValue();
break;
case eStyleUnit_Coord:
position = lineLength < 1e-6 ? 0.0 :
stop.mLocation.GetCoordValue() / appUnitsPerPixel / lineLength;
break;
case eStyleUnit_Calc:
nsStyleCoord::Calc *calc;
calc = stop.mLocation.GetCalcValue();
position = calc->mPercent +
((lineLength < 1e-6) ? 0.0 :
(NSAppUnitsToFloatPixels(calc->mLength, appUnitsPerPixel) / lineLength));
break;
default:
NS_ABORT_IF_FALSE(false, "Unknown stop position type");
}
if (i > 0) {
// Prevent decreasing stop positions by advancing this position
// to the previous stop position, if necessary
position = NS_MAX(position, stops[i - 1].mPosition);
}
stops.AppendElement(ColorStop(position, stop.mColor));
if (firstUnsetPosition > 0) {
// Interpolate positions for all stops that didn't have a specified position
double p = stops[firstUnsetPosition - 1].mPosition;
double d = (stops[i].mPosition - p)/(i - firstUnsetPosition + 1);
for (uint32_t j = firstUnsetPosition; j < i; ++j) {
p += d;
stops[j].mPosition = p;
}
firstUnsetPosition = -1;
}
}
// Eliminate negative-position stops if the gradient is radial.
double firstStop = stops[0].mPosition;
if (aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR && firstStop < 0.0) {
if (aGradient->mRepeating) {
// Choose an instance of the repeated pattern that gives us all positive
// stop-offsets.
double lastStop = stops[stops.Length() - 1].mPosition;
double stopDelta = lastStop - firstStop;
// If all the stops are in approximately the same place then logic below
// will kick in that makes us draw just the last stop color, so don't
// try to do anything in that case. We certainly need to avoid
// dividing by zero.
if (stopDelta >= 1e-6) {
double instanceCount = ceil(-firstStop/stopDelta);
// Advance stops by instanceCount multiples of the period of the
// repeating gradient.
double offset = instanceCount*stopDelta;
for (uint32_t i = 0; i < stops.Length(); i++) {
stops[i].mPosition += offset;
}
}
} else {
// Move negative-position stops to position 0.0. We may also need
// to set the color of the stop to the color the gradient should have
// at the center of the ellipse.
for (uint32_t i = 0; i < stops.Length(); i++) {
double pos = stops[i].mPosition;
if (pos < 0.0) {
stops[i].mPosition = 0.0;
// If this is the last stop, we don't need to adjust the color,
// it will fill the entire area.
if (i < stops.Length() - 1) {
double nextPos = stops[i + 1].mPosition;
// If nextPos is approximately equal to pos, then we don't
// need to adjust the color of this stop because it's
// not going to be displayed.
// If nextPos is negative, we don't need to adjust the color of
// this stop since it's not going to be displayed because
// nextPos will also be moved to 0.0.
if (nextPos >= 0.0 && nextPos - pos >= 1e-6) {
// Compute how far the new position 0.0 is along the interval
// between pos and nextPos.
// XXX Color interpolation (in cairo, too) should use the
// CSS 'color-interpolation' property!
double frac = (0.0 - pos)/(nextPos - pos);
stops[i].mColor =
InterpolateColor(stops[i].mColor, stops[i + 1].mColor, frac);
}
}
}
}
}
firstStop = stops[0].mPosition;
NS_ABORT_IF_FALSE(firstStop >= 0.0, "Failed to fix stop offsets");
}
double lastStop = stops[stops.Length() - 1].mPosition;
// Cairo gradients must have stop positions in the range [0, 1]. So,
// stop positions will be normalized below by subtracting firstStop and then
// multiplying by stopScale.
double stopScale;
double stopDelta = lastStop - firstStop;
bool zeroRadius = aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR &&
(radiusX < 1e-6 || radiusY < 1e-6);
if (stopDelta < 1e-6 || lineLength < 1e-6 || zeroRadius) {
// Stops are all at the same place. Map all stops to 0.0.
// For repeating radial gradients, or for any radial gradients with
// a zero radius, we need to fill with the last stop color, so just set
// both radii to 0.
stopScale = 0.0;
if (aGradient->mRepeating || zeroRadius) {
radiusX = radiusY = 0.0;
}
lastStop = firstStop;
} else {
stopScale = 1.0/stopDelta;
}
// Create the gradient pattern.
nsRefPtr<gfxPattern> gradientPattern;
bool forceRepeatToCoverTiles = false;
if (aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
// Compute the actual gradient line ends we need to pass to cairo after
// stops have been normalized.
gfxPoint gradientStart = lineStart + (lineEnd - lineStart)*firstStop;
gfxPoint gradientEnd = lineStart + (lineEnd - lineStart)*lastStop;
if (stopScale == 0.0) {
// Stops are all at the same place. For repeating gradients, this will
// just paint the last stop color. We don't need to do anything.
// For non-repeating gradients, this should render as two colors, one
// on each "side" of the gradient line segment, which is a point. All
// our stops will be at 0.0; we just need to set the direction vector
// correctly.
gradientEnd = gradientStart + (lineEnd - lineStart);
}
gradientPattern = new gfxPattern(gradientStart.x, gradientStart.y,
gradientEnd.x, gradientEnd.y);
// When the gradient line is parallel to the x axis from the left edge
// to the right edge of a tile, then we can repeat by just repeating the
// gradient.
if (!(flags & GradientCacheKey::SINGLE_CELL) &&
((gradientStart.y == gradientEnd.y && gradientStart.x == 0 &&
gradientEnd.x == oneCellArea.width) ||
(gradientStart.x == gradientEnd.x && gradientStart.y == 0 &&
gradientEnd.y == oneCellArea.height))) {
forceRepeatToCoverTiles = true;
}
} else {
NS_ASSERTION(firstStop >= 0.0,
"Negative stops not allowed for radial gradients");
// To form an ellipse, we'll stretch a circle vertically, if necessary.
// So our radii are based on radiusX.
double innerRadius = radiusX*firstStop;
double outerRadius = radiusX*lastStop;
if (stopScale == 0.0) {
// Stops are all at the same place. See above (except we now have
// the inside vs. outside of an ellipse).
outerRadius = innerRadius + 1;
}
gradientPattern = new gfxPattern(lineStart.x, lineStart.y, innerRadius,
lineStart.x, lineStart.y, outerRadius);
if (radiusX != radiusY) {
// Stretch the circles into ellipses vertically by setting a transform
// in the pattern.
// Recall that this is the transform from user space to pattern space.
// So to stretch the ellipse by factor of P vertically, we scale
// user coordinates by 1/P.
gfxMatrix matrix;
matrix.Translate(lineStart);
matrix.Scale(1.0, radiusX/radiusY);
matrix.Translate(-lineStart);
gradientPattern->SetMatrix(matrix);
}
}
if (gradientPattern->CairoStatus())
return;
// Now set normalized color stops in pattern.
if (stopScale == 0.0) {
// Non-repeating gradient with all stops in same place -> just add
// first stop and last stop, both at position 0.
// Repeating gradient with all stops in the same place, or radial
// gradient with radius of 0 -> just paint the last stop color.
if (!aGradient->mRepeating && !zeroRadius) {
gradientPattern->AddColorStop(0.0, stops[0].mColor);
}
gradientPattern->AddColorStop(0.0, stops[stops.Length() - 1].mColor);
} else {
// Use all stops
for (uint32_t i = 0; i < stops.Length(); i++) {
double pos = stopScale*(stops[i].mPosition - firstStop);
gradientPattern->AddColorStop(pos, stops[i].mColor);
}
}
// Set repeat mode. Default cairo extend mode is PAD.
if (aGradient->mRepeating || forceRepeatToCoverTiles) {
gradientPattern->SetExtend(gfxPattern::EXTEND_REPEAT);
}
// Register the gradient newly computed in the cache.
pattern = new GradientCacheData(gradientPattern, forceRepeatToCoverTiles,
GradientCacheKey(aGradient, oneCellArea.Size(), flags, backendType));
gradientRegistered = gGradientCache->RegisterEntry(pattern);
}
// Paint gradient tiles. This isn't terribly efficient, but doing it this
// way is simple and sure to get pixel-snapping right. We could speed things
// up by drawing tiles into temporary surfaces and copying those to the
// destination, but after pixel-snapping tiles may not all be the same size.
nsRect dirty;
if (!dirty.IntersectRect(aDirtyRect, aFillArea))
return;
gfxRect areaToFill =
nsLayoutUtils::RectToGfxRect(aFillArea, appUnitsPerPixel);
gfxMatrix ctm = ctx->CurrentMatrix();
bool isCTMPreservingAxisAlignedRectangles = ctm.PreservesAxisAlignedRectangles();
// xStart/yStart are the top-left corner of the top-left tile.
nscoord xStart = FindTileStart(dirty.x, aOneCellArea.x, aOneCellArea.width);
nscoord yStart = FindTileStart(dirty.y, aOneCellArea.y, aOneCellArea.height);
nscoord xEnd = pattern->mCoversTile ? xStart + aOneCellArea.width : dirty.XMost();
nscoord yEnd = pattern->mCoversTile ? yStart + aOneCellArea.height : dirty.YMost();
// x and y are the top-left corner of the tile to draw
for (nscoord y = yStart; y < yEnd; y += aOneCellArea.height) {
for (nscoord x = xStart; x < xEnd; x += aOneCellArea.width) {
// The coordinates of the tile
gfxRect tileRect = nsLayoutUtils::RectToGfxRect(
nsRect(x, y, aOneCellArea.width, aOneCellArea.height),
appUnitsPerPixel);
// The actual area to fill with this tile is the intersection of this
// tile with the overall area we're supposed to be filling
gfxRect fillRect =
pattern->mCoversTile ? areaToFill : tileRect.Intersect(areaToFill);
ctx->NewPath();
// Try snapping the fill rect. Snap its top-left and bottom-right
// independently to preserve the orientation.
gfxPoint snappedFillRectTopLeft = fillRect.TopLeft();
gfxPoint snappedFillRectBottomRight = fillRect.BottomRight();
if (isCTMPreservingAxisAlignedRectangles &&
ctx->UserToDevicePixelSnapped(snappedFillRectTopLeft, true) &&
ctx->UserToDevicePixelSnapped(snappedFillRectBottomRight, true)) {
if (snappedFillRectTopLeft.x == snappedFillRectBottomRight.x ||
snappedFillRectTopLeft.y == snappedFillRectBottomRight.y) {
// Nothing to draw; avoid scaling by zero and other weirdness that
// could put the context in an error state.
continue;
}
// Set the context's transform to the transform that maps fillRect to
// snappedFillRect. The part of the gradient that was going to
// exactly fill fillRect will fill snappedFillRect instead.
ctx->IdentityMatrix();
ctx->Translate(snappedFillRectTopLeft);
ctx->Scale((snappedFillRectBottomRight.x - snappedFillRectTopLeft.x)/fillRect.width,
(snappedFillRectBottomRight.y - snappedFillRectTopLeft.y)/fillRect.height);
ctx->Translate(-fillRect.TopLeft());
}
ctx->Rectangle(fillRect);
ctx->Translate(tileRect.TopLeft());
ctx->SetPattern(pattern->mPattern);
ctx->Fill();
ctx->SetMatrix(ctm);
}
}
// If we could not put the gradient in the gradient cache, make sure to
// release its resources so we don't leak.
if (!gradientRegistered) {
delete pattern;
}
}
void
nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aBackgroundSC,
const nsStyleBorder& aBorder,
uint32_t aFlags,
nsRect* aBGClipRect,
int32_t aLayer)
{
NS_PRECONDITION(aForFrame,
"Frame is expected to be provided to PaintBackground");
// Check to see if we have an appearance defined. If so, we let the theme
// renderer draw the background and bail out.
// XXXzw this ignores aBGClipRect.
const nsStyleDisplay* displayData = aForFrame->GetStyleDisplay();
if (displayData->mAppearance) {
nsITheme *theme = aPresContext->GetTheme();
if (theme && theme->ThemeSupportsWidget(aPresContext, aForFrame,
displayData->mAppearance)) {
nsRect drawing(aBorderArea);
theme->GetWidgetOverflow(aPresContext->DeviceContext(),
aForFrame, displayData->mAppearance, &drawing);
drawing.IntersectRect(drawing, aDirtyRect);
theme->DrawWidgetBackground(&aRenderingContext, aForFrame,
displayData->mAppearance, aBorderArea,
drawing);
return;
}
}
// For canvas frames (in the CSS sense) we draw the background color using
// a solid color item that gets added in nsLayoutUtils::PaintFrame,
// or nsSubDocumentFrame::BuildDisplayList (bug 488242). (The solid
// color may be moved into nsDisplayCanvasBackground by
// nsPresShell::AddCanvasBackgroundColorItem, and painted by
// nsDisplayCanvasBackground directly.) Either way we don't need to
// paint the background color here.
bool isCanvasFrame = IsCanvasFrame(aForFrame);
// Determine whether we are drawing background images and/or
// background colors.
bool drawBackgroundImage;
bool drawBackgroundColor;
nscolor bgColor = DetermineBackgroundColor(aPresContext,
aBackgroundSC,
aForFrame,
drawBackgroundImage,
drawBackgroundColor);
// If we're not drawing the back-most layer, we don't want to draw the
// background color.
const nsStyleBackground *bg = aBackgroundSC->GetStyleBackground();
if (drawBackgroundColor && aLayer >= 0 &&
static_cast<uint32_t>(aLayer) != bg->mImageCount - 1) {
drawBackgroundColor = false;
}
// At this point, drawBackgroundImage and drawBackgroundColor are
// true if and only if we are actually supposed to paint an image or
// color into aDirtyRect, respectively.
if (!drawBackgroundImage && !drawBackgroundColor)
return;
// Compute the outermost boundary of the area that might be painted.
gfxContext *ctx = aRenderingContext.ThebesContext();
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
// Same coordinate space as aBorderArea & aBGClipRect
gfxCornerSizes bgRadii;
bool haveRoundedCorners;
{
nscoord radii[8];
nsSize frameSize = aForFrame->GetSize();
if (&aBorder == aForFrame->GetStyleBorder() &&
frameSize == aBorderArea.Size()) {
haveRoundedCorners = aForFrame->GetBorderRadii(radii);
} else {
haveRoundedCorners = nsIFrame::ComputeBorderRadii(aBorder.mBorderRadius,
frameSize, aBorderArea.Size(),
aForFrame->GetSkipSides(), radii);
}
if (haveRoundedCorners)
ComputePixelRadii(radii, appUnitsPerPixel, &bgRadii);
}
// The 'bgClipArea' (used only by the image tiling logic, far below)
// is the caller-provided aBGClipRect if any, or else the area
// determined by the value of 'background-clip' in
// SetupCurrentBackgroundClip. (Arguably it should be the
// intersection, but that breaks the table painter -- in particular,
// taking the intersection breaks reftests/bugs/403249-1[ab].)
BackgroundClipState clipState;
uint8_t currentBackgroundClip;
bool isSolidBorder;
if (aBGClipRect) {
clipState.mBGClipArea = *aBGClipRect;
clipState.mCustomClip = true;
SetupDirtyRects(clipState.mBGClipArea, aDirtyRect, appUnitsPerPixel,
&clipState.mDirtyRect, &clipState.mDirtyRectGfx);
} else {
// The background is rendered over the 'background-clip' area,
// which is normally equal to the border area but may be reduced
// to the padding area by CSS. Also, if the border is solid, we
// don't need to draw outside the padding area. In either case,
// if the borders are rounded, make sure we use the same inner
// radii as the border code will.
// The background-color is drawn based on the bottom
// background-clip.
currentBackgroundClip = bg->BottomLayer().mClip;
isSolidBorder =
(aFlags & PAINTBG_WILL_PAINT_BORDER) && IsOpaqueBorder(aBorder);
if (isSolidBorder && currentBackgroundClip == NS_STYLE_BG_CLIP_BORDER) {
// If we have rounded corners, we need to inflate the background
// drawing area a bit to avoid seams between the border and
// background.
currentBackgroundClip = haveRoundedCorners ?
NS_STYLE_BG_CLIP_MOZ_ALMOST_PADDING : NS_STYLE_BG_CLIP_PADDING;
}
GetBackgroundClip(ctx, currentBackgroundClip, aForFrame, aBorderArea,
aDirtyRect, haveRoundedCorners, bgRadii, appUnitsPerPixel,
&clipState);
}
// If we might be using a background color, go ahead and set it now.
if (drawBackgroundColor && !isCanvasFrame)
ctx->SetColor(gfxRGBA(bgColor));
gfxContextAutoSaveRestore autoSR;
// If there is no background image, draw a color. (If there is
// neither a background image nor a color, we wouldn't have gotten
// this far.)
if (!drawBackgroundImage) {
if (!isCanvasFrame) {
DrawBackgroundColor(clipState, ctx, haveRoundedCorners, appUnitsPerPixel);
}
return;
}
if (bg->mImageCount < 1) {
// Return if there are no background layers, all work from this point
// onwards happens iteratively on these.
return;
}
// Validate the layer range before we start iterating.
int32_t startLayer = aLayer;
int32_t nLayers = 1;
if (startLayer < 0) {
startLayer = (int32_t)bg->mImageCount - 1;
nLayers = bg->mImageCount;
}
// Ensure we get invalidated for loads of the image. We need to do
// this here because this might be the only code that knows about the
// association of the style data with the frame.
if (aBackgroundSC != aForFrame->GetStyleContext()) {
ImageLoader* loader = aPresContext->Document()->StyleImageLoader();
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT_WITH_RANGE(i, bg, startLayer, nLayers) {
if (bg->mLayers[i].mImage.GetType() == eStyleImageType_Image) {
imgIRequest *image = bg->mLayers[i].mImage.GetImageData();
loader->AssociateRequestToFrame(image, aForFrame);
}
}
}
// The background color is rendered over the entire dirty area,
// even if the image isn't.
if (drawBackgroundColor && !isCanvasFrame) {
DrawBackgroundColor(clipState, ctx, haveRoundedCorners, appUnitsPerPixel);
}
if (drawBackgroundImage) {
bool clipSet = false;
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT_WITH_RANGE(i, bg, startLayer, nLayers) {
const nsStyleBackground::Layer &layer = bg->mLayers[i];
if (!aBGClipRect) {
uint8_t newBackgroundClip = layer.mClip;
if (isSolidBorder && newBackgroundClip == NS_STYLE_BG_CLIP_BORDER) {
newBackgroundClip = haveRoundedCorners ?
NS_STYLE_BG_CLIP_MOZ_ALMOST_PADDING : NS_STYLE_BG_CLIP_PADDING;
}
if (currentBackgroundClip != newBackgroundClip || !clipSet) {
currentBackgroundClip = newBackgroundClip;
// If clipSet is false that means this is the bottom layer and we
// already called GetBackgroundClip above and it stored its results
// in clipState.
if (clipSet) {
GetBackgroundClip(ctx, currentBackgroundClip, aForFrame,
aBorderArea, aDirtyRect, haveRoundedCorners,
bgRadii, appUnitsPerPixel, &clipState);
}
SetupBackgroundClip(clipState, ctx, haveRoundedCorners,
appUnitsPerPixel, &autoSR);
clipSet = true;
}
}
if (!clipState.mDirtyRectGfx.IsEmpty()) {
nsBackgroundLayerState state = PrepareBackgroundLayer(aPresContext, aForFrame,
aFlags, aBorderArea, clipState.mBGClipArea, *bg, layer);
if (!state.mFillArea.IsEmpty()) {
state.mImageRenderer.Draw(aPresContext, aRenderingContext,
state.mDestArea, state.mFillArea,
state.mAnchor + aBorderArea.TopLeft(),
clipState.mDirtyRect);
}
}
}
}
}
static inline bool
IsTransformed(nsIFrame* aForFrame, nsIFrame* aTopFrame)
{
for (nsIFrame* f = aForFrame; f != aTopFrame; f = f->GetParent()) {
if (f->IsTransformed()) {
return true;
}
}
return false;
}
nsBackgroundLayerState
nsCSSRendering::PrepareBackgroundLayer(nsPresContext* aPresContext,
nsIFrame* aForFrame,
uint32_t aFlags,
const nsRect& aBorderArea,
const nsRect& aBGClipRect,
const nsStyleBackground& aBackground,
const nsStyleBackground::Layer& aLayer)
{
/*
* The background properties we need to keep in mind when drawing background
* layers are:
*
* background-image
* background-repeat
* background-attachment
* background-position
* background-clip
* background-origin
* background-size
* background-break (-moz-background-inline-policy)
*
* (background-color applies to the entire element and not to individual
* layers, so it is irrelevant to this method.)
*
* These properties have the following dependencies upon each other when
* determining rendering:
*
* background-image
* no dependencies
* background-repeat
* no dependencies
* background-attachment
* no dependencies
* background-position
* depends upon background-size (for the image's scaled size) and
* background-break (for the background positioning area)
* background-clip
* no dependencies
* background-origin
* depends upon background-attachment (only in the case where that value
* is 'fixed')
* background-size
* depends upon background-break (for the background positioning area for
* resolving percentages), background-image (for the image's intrinsic
* size), background-repeat (if that value is 'round'), and
* background-origin (for the background painting area, when
* background-repeat is 'round')
* background-break
* depends upon background-origin (specifying how the boxes making up the
* background positioning area are determined)
*
* As a result of only-if dependencies we don't strictly do a topological
* sort of the above properties when processing, but it's pretty close to one:
*
* background-clip (by caller)
* background-image
* background-break, background-origin
* background-attachment (postfix for background-{origin,break} if 'fixed')
* background-size
* background-position
* background-repeat
*/
uint32_t irFlags = 0;
if (aFlags & nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES) {
irFlags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
}
nsBackgroundLayerState state(aForFrame, &aLayer.mImage, irFlags);
if (!state.mImageRenderer.PrepareImage()) {
// There's no image or it's not ready to be painted.
return state;
}
// Compute background origin area relative to aBorderArea now as we may need
// it to compute the effective image size for a CSS gradient.
nsRect bgPositioningArea(0, 0, 0, 0);
nsIAtom* frameType = aForFrame->GetType();
nsIFrame* geometryFrame = aForFrame;
if (frameType == nsGkAtoms::inlineFrame) {
// XXXjwalden Strictly speaking this is not quite faithful to how
// background-break is supposed to interact with background-origin values,
// but it's a non-trivial amount of work to make it fully conformant, and
// until the specification is more finalized (and assuming background-break
// even makes the cut) it doesn't make sense to hammer out exact behavior.
switch (aBackground.mBackgroundInlinePolicy) {
case NS_STYLE_BG_INLINE_POLICY_EACH_BOX:
bgPositioningArea = nsRect(nsPoint(0,0), aBorderArea.Size());
break;
case NS_STYLE_BG_INLINE_POLICY_BOUNDING_BOX:
bgPositioningArea = gInlineBGData->GetBoundingRect(aForFrame);
break;
default:
NS_ERROR("Unknown background-inline-policy value! "
"Please, teach me what to do.");
case NS_STYLE_BG_INLINE_POLICY_CONTINUOUS:
bgPositioningArea = gInlineBGData->GetContinuousRect(aForFrame);
break;
}
} else if (frameType == nsGkAtoms::canvasFrame) {
geometryFrame = aForFrame->GetFirstPrincipalChild();
// geometryFrame might be null if this canvas is a page created
// as an overflow container (e.g. the in-flow content has already
// finished and this page only displays the continuations of
// absolutely positioned content).
if (geometryFrame) {
bgPositioningArea = geometryFrame->GetRect();
}
} else {
bgPositioningArea = nsRect(nsPoint(0,0), aBorderArea.Size());
}
// Background images are tiled over the 'background-clip' area
// but the origin of the tiling is based on the 'background-origin' area
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_BORDER && geometryFrame) {
nsMargin border = geometryFrame->GetUsedBorder();
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
border += geometryFrame->GetUsedPadding();
NS_ASSERTION(aLayer.mOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
"unknown background-origin value");
}
geometryFrame->ApplySkipSides(border);
bgPositioningArea.Deflate(border);
}
// For background-attachment:fixed backgrounds, we'll limit the area
// where the background can be drawn to the viewport.
nsRect bgClipRect = aBGClipRect;
// Compute the anchor point.
//
// relative to aBorderArea.TopLeft() (which is where the top-left
// of aForFrame's border-box will be rendered)
nsPoint imageTopLeft;
if (NS_STYLE_BG_ATTACHMENT_FIXED == aLayer.mAttachment) {
aPresContext->SetHasFixedBackgroundFrame();
// If it's a fixed background attachment, then the image is placed
// relative to the viewport, which is the area of the root frame
// in a screen context or the page content frame in a print context.
nsIFrame* topFrame =
aPresContext->PresShell()->FrameManager()->GetRootFrame();
NS_ASSERTION(topFrame, "no root frame");
nsIFrame* pageContentFrame = nullptr;
if (aPresContext->IsPaginated()) {
pageContentFrame =
nsLayoutUtils::GetClosestFrameOfType(aForFrame, nsGkAtoms::pageContentFrame);
if (pageContentFrame) {
topFrame = pageContentFrame;
}
// else this is an embedded shell and its root frame is what we want
}
// Set the background positioning area to the viewport's area
// (relative to aForFrame)
bgPositioningArea = nsRect(-aForFrame->GetOffsetTo(topFrame), topFrame->GetSize());
if (!pageContentFrame) {
// Subtract the size of scrollbars.
nsIScrollableFrame* scrollableFrame =
aPresContext->PresShell()->GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
nsMargin scrollbars = scrollableFrame->GetActualScrollbarSizes();
bgPositioningArea.Deflate(scrollbars);
}
}
if (aFlags & nsCSSRendering::PAINTBG_TO_WINDOW &&
!IsTransformed(aForFrame, topFrame)) {
// Clip background-attachment:fixed backgrounds to the viewport, if we're
// painting to the screen and not transformed. This avoids triggering
// tiling in common cases, without affecting output since drawing is
// always clipped to the viewport when we draw to the screen. (But it's
// not a pure optimization since it can affect the values of pixels at the
// edge of the viewport --- whether they're sampled from a putative "next
// tile" or not.)
bgClipRect.IntersectRect(bgClipRect, bgPositioningArea + aBorderArea.TopLeft());
}
}
// Scale the image as specified for background-size and as required for
// proper background positioning when background-position is defined with
// percentages.
nsSize imageSize = state.mImageRenderer.ComputeSize(aLayer.mSize, bgPositioningArea.Size());
if (imageSize.width <= 0 || imageSize.height <= 0)
return state;
// Compute the position of the background now that the background's size is
// determined.
ComputeBackgroundAnchorPoint(aLayer, bgPositioningArea.Size(), imageSize,
&imageTopLeft, &state.mAnchor);
imageTopLeft += bgPositioningArea.TopLeft();
state.mAnchor += bgPositioningArea.TopLeft();
state.mDestArea = nsRect(imageTopLeft + aBorderArea.TopLeft(), imageSize);
state.mFillArea = state.mDestArea;
int repeatX = aLayer.mRepeat.mXRepeat;
int repeatY = aLayer.mRepeat.mYRepeat;
if (repeatX == NS_STYLE_BG_REPEAT_REPEAT) {
state.mFillArea.x = bgClipRect.x;
state.mFillArea.width = bgClipRect.width;
}
if (repeatY == NS_STYLE_BG_REPEAT_REPEAT) {
state.mFillArea.y = bgClipRect.y;
state.mFillArea.height = bgClipRect.height;
}
state.mFillArea.IntersectRect(state.mFillArea, bgClipRect);
return state;
}
nsRect
nsCSSRendering::GetBackgroundLayerRect(nsPresContext* aPresContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBackground& aBackground,
const nsStyleBackground::Layer& aLayer)
{
nsBackgroundLayerState state =
PrepareBackgroundLayer(aPresContext, aForFrame, 0, aBorderArea,
aBorderArea, aBackground, aLayer);
return state.mFillArea;
}
static void
DrawBorderImage(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
const nsRect& aDirtyRect)
{
NS_PRECONDITION(aStyleBorder.IsBorderImageLoaded(),
"drawing border image that isn't successfully loaded");
if (aDirtyRect.IsEmpty())
return;
// Ensure we get invalidated for loads and animations of the image.
// We need to do this here because this might be the only code that
// knows about the association of the style data with the frame.
// XXX We shouldn't really... since if anybody is passing in a
// different style, they'll potentially have the wrong size for the
// border too.
imgIRequest *req = aStyleBorder.GetBorderImage();
ImageLoader* loader = aPresContext->Document()->StyleImageLoader();
// If this fails there's not much we can do ...
loader->AssociateRequestToFrame(req, aForFrame);
// Get the actual image.
nsCOMPtr<imgIContainer> imgContainer;
DebugOnly<nsresult> rv = req->GetImage(getter_AddRefs(imgContainer));
NS_ASSERTION(NS_SUCCEEDED(rv) && imgContainer, "no image to draw");
nsIntSize imageSize;
if (NS_FAILED(imgContainer->GetWidth(&imageSize.width))) {
imageSize.width =
nsPresContext::AppUnitsToIntCSSPixels(aBorderArea.width);
}
if (NS_FAILED(imgContainer->GetHeight(&imageSize.height))) {
imageSize.height =
nsPresContext::AppUnitsToIntCSSPixels(aBorderArea.height);
}
// Determine the border image area, which by default corresponds to the
// border box but can be modified by 'border-image-outset'.
nsRect borderImgArea(aBorderArea);
borderImgArea.Inflate(aStyleBorder.GetImageOutset());
// Compute the used values of 'border-image-slice' and 'border-image-width';
// we do them together because the latter can depend on the former.
nsIntMargin slice;
nsMargin border;
NS_FOR_CSS_SIDES(s) {
nsStyleCoord coord = aStyleBorder.mBorderImageSlice.Get(s);
int32_t imgDimension = NS_SIDE_IS_VERTICAL(s)
? imageSize.width : imageSize.height;
nscoord borderDimension = NS_SIDE_IS_VERTICAL(s)
? borderImgArea.width : borderImgArea.height;
double value;
switch (coord.GetUnit()) {
case eStyleUnit_Percent:
value = coord.GetPercentValue() * imgDimension;
break;
case eStyleUnit_Factor:
value = coord.GetFactorValue();
break;
default:
NS_NOTREACHED("unexpected CSS unit for image slice");
value = 0;
break;
}
if (value < 0)
value = 0;
if (value > imgDimension)
value = imgDimension;
slice.Side(s) = NS_lround(value);
nsMargin borderWidths(aStyleBorder.GetComputedBorder());
coord = aStyleBorder.mBorderImageWidth.Get(s);
switch (coord.GetUnit()) {
case eStyleUnit_Coord: // absolute dimension
value = coord.GetCoordValue();
break;
case eStyleUnit_Percent:
value = coord.GetPercentValue() * borderDimension;
break;
case eStyleUnit_Factor:
value = coord.GetFactorValue() * borderWidths.Side(s);
break;
case eStyleUnit_Auto: // same as the slice value, in CSS pixels
value = nsPresContext::CSSPixelsToAppUnits(slice.Side(s));
break;
default:
NS_NOTREACHED("unexpected CSS unit for border image area division");
value = 0;
break;
}
border.Side(s) = NS_lround(value);
}
// "If two opposite border-image-width offsets are large enough that they
// overlap, their used values are proportionately reduced until they no
// longer overlap."
double scaleX = border.left + border.right > borderImgArea.width
? borderImgArea.width / double(border.left + border.right)
: 1.0;
double scaleY = border.top + border.bottom > borderImgArea.height
? borderImgArea.height / double(border.top + border.bottom)
: 1.0;
double scale = NS_MIN(scaleX, scaleY);
if (scale < 1.0) {
border.left *= scale;
border.right *= scale;
border.top *= scale;
border.bottom *= scale;
NS_ASSERTION(border.left + border.right <= borderImgArea.width &&
border.top + border.bottom <= borderImgArea.height,
"rounding error in width reduction???");
}
// These helper tables recharacterize the 'slice' and 'width' margins
// in a more convenient form: they are the x/y/width/height coords
// required for various bands of the border, and they have been transformed
// to be relative to the innerRect (for 'slice') or the page (for 'border').
enum {
LEFT, MIDDLE, RIGHT,
TOP = LEFT, BOTTOM = RIGHT
};
const nscoord borderX[3] = {
borderImgArea.x + 0,
borderImgArea.x + border.left,
borderImgArea.x + borderImgArea.width - border.right,
};
const nscoord borderY[3] = {
borderImgArea.y + 0,
borderImgArea.y + border.top,
borderImgArea.y + borderImgArea.height - border.bottom,
};
const nscoord borderWidth[3] = {
border.left,
borderImgArea.width - border.left - border.right,
border.right,
};
const nscoord borderHeight[3] = {
border.top,
borderImgArea.height - border.top - border.bottom,
border.bottom,
};
const int32_t sliceX[3] = {
0,
slice.left,
imageSize.width - slice.right,
};
const int32_t sliceY[3] = {
0,
slice.top,
imageSize.height - slice.bottom,
};
const int32_t sliceWidth[3] = {
slice.left,
NS_MAX(imageSize.width - slice.left - slice.right, 0),
slice.right,
};
const int32_t sliceHeight[3] = {
slice.top,
NS_MAX(imageSize.height - slice.top - slice.bottom, 0),
slice.bottom,
};
// In all the 'factor' calculations below, 'border' measurements are
// in app units but 'slice' measurements are in image/CSS pixels, so
// the factor corresponding to no additional scaling is
// CSSPixelsToAppUnits(1), not simply 1.
for (int i = LEFT; i <= RIGHT; i++) {
for (int j = TOP; j <= BOTTOM; j++) {
nsRect destArea(borderX[i], borderY[j], borderWidth[i], borderHeight[j]);
nsIntRect subArea(sliceX[i], sliceY[j], sliceWidth[i], sliceHeight[j]);
uint8_t fillStyleH, fillStyleV;
nsSize unitSize;
if (i == MIDDLE && j == MIDDLE) {
// Discard the middle portion unless set to fill.
if (NS_STYLE_BORDER_IMAGE_SLICE_NOFILL ==
aStyleBorder.mBorderImageFill) {
continue;
}
NS_ASSERTION(NS_STYLE_BORDER_IMAGE_SLICE_FILL ==
aStyleBorder.mBorderImageFill,
"Unexpected border image fill");
// css-background:
// The middle image's width is scaled by the same factor as the
// top image unless that factor is zero or infinity, in which
// case the scaling factor of the bottom is substituted, and
// failing that, the width is not scaled. The height of the
// middle image is scaled by the same factor as the left image
// unless that factor is zero or infinity, in which case the
// scaling factor of the right image is substituted, and failing
// that, the height is not scaled.
gfxFloat hFactor, vFactor;
if (0 < border.left && 0 < slice.left)
vFactor = gfxFloat(border.left)/slice.left;
else if (0 < border.right && 0 < slice.right)
vFactor = gfxFloat(border.right)/slice.right;
else
vFactor = nsPresContext::CSSPixelsToAppUnits(1);
if (0 < border.top && 0 < slice.top)
hFactor = gfxFloat(border.top)/slice.top;
else if (0 < border.bottom && 0 < slice.bottom)
hFactor = gfxFloat(border.bottom)/slice.bottom;
else
hFactor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = sliceWidth[i]*hFactor;
unitSize.height = sliceHeight[j]*vFactor;
fillStyleH = aStyleBorder.mBorderImageRepeatH;
fillStyleV = aStyleBorder.mBorderImageRepeatV;
} else if (i == MIDDLE) { // top, bottom
// Sides are always stretched to the thickness of their border,
// and stretched proportionately on the other axis.
gfxFloat factor;
if (0 < borderHeight[j] && 0 < sliceHeight[j])
factor = gfxFloat(borderHeight[j])/sliceHeight[j];
else
factor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = sliceWidth[i]*factor;
unitSize.height = borderHeight[j];
fillStyleH = aStyleBorder.mBorderImageRepeatH;
fillStyleV = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
} else if (j == MIDDLE) { // left, right
gfxFloat factor;
if (0 < borderWidth[i] && 0 < sliceWidth[i])
factor = gfxFloat(borderWidth[i])/sliceWidth[i];
else
factor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = borderWidth[i];
unitSize.height = sliceHeight[j]*factor;
fillStyleH = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
fillStyleV = aStyleBorder.mBorderImageRepeatV;
} else {
// Corners are always stretched to fit the corner.
unitSize.width = borderWidth[i];
unitSize.height = borderHeight[j];
fillStyleH = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
fillStyleV = NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH;
}
DrawBorderImageComponent(aRenderingContext, aForFrame,
imgContainer, aDirtyRect,
destArea, subArea,
fillStyleH, fillStyleV,
unitSize, aStyleBorder, i * (RIGHT + 1) + j);
}
}
}
static void
DrawBorderImageComponent(nsRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
imgIContainer* aImage,
const nsRect& aDirtyRect,
const nsRect& aFill,
const nsIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
const nsStyleBorder& aStyleBorder,
uint8_t aIndex)
{
if (aFill.IsEmpty() || aSrc.IsEmpty())
return;
// Don't bother trying to cache sub images if the border image is animated
// We can only sucessfully call GetAnimated() if we are fully decoded, so default to true
bool animated = true;
aImage->GetAnimated(&animated);
nsCOMPtr<imgIContainer> subImage;
if (animated || (subImage = aStyleBorder.GetSubImage(aIndex)) == 0) {
if (NS_FAILED(aImage->ExtractFrame(imgIContainer::FRAME_CURRENT, aSrc,
imgIContainer::FLAG_SYNC_DECODE,
getter_AddRefs(subImage))))
return;
if (!animated)
aStyleBorder.SetSubImage(aIndex, subImage);
}
gfxPattern::GraphicsFilter graphicsFilter =
nsLayoutUtils::GetGraphicsFilterForFrame(aForFrame);
// If we have no tiling in either direction, we can skip the intermediate
// scaling step.
if ((aHFill == NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH &&
aVFill == NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH) ||
(aUnitSize.width == aFill.width &&
aUnitSize.height == aFill.height)) {
nsLayoutUtils::DrawSingleImage(&aRenderingContext, subImage,
graphicsFilter,
aFill, aDirtyRect, imgIContainer::FLAG_NONE);
return;
}
// Compute the scale and position of the master copy of the image.
nsRect tile;
switch (aHFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.x = aFill.x;
tile.width = aFill.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
tile.width = aUnitSize.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.x = aFill.x;
tile.width = aFill.width / ceil(gfxFloat(aFill.width)/aUnitSize.width);
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
switch (aVFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.y = aFill.y;
tile.height = aFill.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
tile.height = aUnitSize.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.y = aFill.y;
tile.height = aFill.height/ceil(gfxFloat(aFill.height)/aUnitSize.height);
break;
default:
NS_NOTREACHED("unrecognized border-image fill style");
}
nsLayoutUtils::DrawImage(&aRenderingContext, subImage, graphicsFilter,
tile, aFill, tile.TopLeft(), aDirtyRect,
imgIContainer::FLAG_NONE);
}
// Begin table border-collapsing section
// These functions were written to not disrupt the normal ones and yet satisfy some additional requirements
// At some point, all functions should be unified to include the additional functionality that these provide
static nscoord
RoundIntToPixel(nscoord aValue,
nscoord aTwipsPerPixel,
bool aRoundDown = false)
{
if (aTwipsPerPixel <= 0)
// We must be rendering to a device that has a resolution greater than Twips!
// In that case, aValue is as accurate as it's going to get.
return aValue;
nscoord halfPixel = NSToCoordRound(aTwipsPerPixel / 2.0f);
nscoord extra = aValue % aTwipsPerPixel;
nscoord finalValue = (!aRoundDown && (extra >= halfPixel)) ? aValue + (aTwipsPerPixel - extra) : aValue - extra;
return finalValue;
}
static nscoord
RoundFloatToPixel(float aValue,
nscoord aTwipsPerPixel,
bool aRoundDown = false)
{
return RoundIntToPixel(NSToCoordRound(aValue), aTwipsPerPixel, aRoundDown);
}
static void
SetPoly(const nsRect& aRect,
nsPoint* poly)
{
poly[0].x = aRect.x;
poly[0].y = aRect.y;
poly[1].x = aRect.x + aRect.width;
poly[1].y = aRect.y;
poly[2].x = aRect.x + aRect.width;
poly[2].y = aRect.y + aRect.height;
poly[3].x = aRect.x;
poly[3].y = aRect.y + aRect.height;
poly[4].x = aRect.x;
poly[4].y = aRect.y;
}
static void
DrawSolidBorderSegment(nsRenderingContext& aContext,
nsRect aRect,
nscoord aTwipsPerPixel,
uint8_t aStartBevelSide = 0,
nscoord aStartBevelOffset = 0,
uint8_t aEndBevelSide = 0,
nscoord aEndBevelOffset = 0)
{
if ((aRect.width == aTwipsPerPixel) || (aRect.height == aTwipsPerPixel) ||
((0 == aStartBevelOffset) && (0 == aEndBevelOffset))) {
// simple line or rectangle
if ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide)) {
if (1 == aRect.height)
aContext.DrawLine(aRect.TopLeft(), aRect.BottomLeft());
else
aContext.FillRect(aRect);
}
else {
if (1 == aRect.width)
aContext.DrawLine(aRect.TopLeft(), aRect.TopRight());
else
aContext.FillRect(aRect);
}
}
else {
// polygon with beveling
nsPoint poly[5];
SetPoly(aRect, poly);
switch(aStartBevelSide) {
case NS_SIDE_TOP:
poly[0].x += aStartBevelOffset;
poly[4].x = poly[0].x;
break;
case NS_SIDE_BOTTOM:
poly[3].x += aStartBevelOffset;
break;
case NS_SIDE_RIGHT:
poly[1].y += aStartBevelOffset;
break;
case NS_SIDE_LEFT:
poly[0].y += aStartBevelOffset;
poly[4].y = poly[0].y;
}
switch(aEndBevelSide) {
case NS_SIDE_TOP:
poly[1].x -= aEndBevelOffset;
break;
case NS_SIDE_BOTTOM:
poly[2].x -= aEndBevelOffset;
break;
case NS_SIDE_RIGHT:
poly[2].y -= aEndBevelOffset;
break;
case NS_SIDE_LEFT:
poly[3].y -= aEndBevelOffset;
}
aContext.FillPolygon(poly, 5);
}
}
static void
GetDashInfo(nscoord aBorderLength,
nscoord aDashLength,
nscoord aTwipsPerPixel,
int32_t& aNumDashSpaces,
nscoord& aStartDashLength,
nscoord& aEndDashLength)
{
aNumDashSpaces = 0;
if (aStartDashLength + aDashLength + aEndDashLength >= aBorderLength) {
aStartDashLength = aBorderLength;
aEndDashLength = 0;
}
else {
aNumDashSpaces = (aBorderLength - aDashLength)/ (2 * aDashLength); // round down
nscoord extra = aBorderLength - aStartDashLength - aEndDashLength - (((2 * aNumDashSpaces) - 1) * aDashLength);
if (extra > 0) {
nscoord half = RoundIntToPixel(extra / 2, aTwipsPerPixel);
aStartDashLength += half;
aEndDashLength += (extra - half);
}
}
}
void
nsCSSRendering::DrawTableBorderSegment(nsRenderingContext& aContext,
uint8_t aBorderStyle,
nscolor aBorderColor,
const nsStyleBackground* aBGColor,
const nsRect& aBorder,
int32_t aAppUnitsPerCSSPixel,
uint8_t aStartBevelSide,
nscoord aStartBevelOffset,
uint8_t aEndBevelSide,
nscoord aEndBevelOffset)
{
aContext.SetColor (aBorderColor);
bool horizontal = ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide));
nscoord twipsPerPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerCSSPixel);
uint8_t ridgeGroove = NS_STYLE_BORDER_STYLE_RIDGE;
if ((twipsPerPixel >= aBorder.width) || (twipsPerPixel >= aBorder.height) ||
(NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle) || (NS_STYLE_BORDER_STYLE_DOTTED == aBorderStyle)) {
// no beveling for 1 pixel border, dash or dot
aStartBevelOffset = 0;
aEndBevelOffset = 0;
}
gfxContext *ctx = aContext.ThebesContext();
gfxContext::AntialiasMode oldMode = ctx->CurrentAntialiasMode();
ctx->SetAntialiasMode(gfxContext::MODE_ALIASED);
switch (aBorderStyle) {
case NS_STYLE_BORDER_STYLE_NONE:
case NS_STYLE_BORDER_STYLE_HIDDEN:
//NS_ASSERTION(false, "style of none or hidden");
break;
case NS_STYLE_BORDER_STYLE_DOTTED:
case NS_STYLE_BORDER_STYLE_DASHED:
{
nscoord dashLength = (NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle) ? DASH_LENGTH : DOT_LENGTH;
// make the dash length proportional to the border thickness
dashLength *= (horizontal) ? aBorder.height : aBorder.width;
// make the min dash length for the ends 1/2 the dash length
nscoord minDashLength = (NS_STYLE_BORDER_STYLE_DASHED == aBorderStyle)
? RoundFloatToPixel(((float)dashLength) / 2.0f, twipsPerPixel) : dashLength;
minDashLength = NS_MAX(minDashLength, twipsPerPixel);
nscoord numDashSpaces = 0;
nscoord startDashLength = minDashLength;
nscoord endDashLength = minDashLength;
if (horizontal) {
GetDashInfo(aBorder.width, dashLength, twipsPerPixel, numDashSpaces, startDashLength, endDashLength);
nsRect rect(aBorder.x, aBorder.y, startDashLength, aBorder.height);
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
for (int32_t spaceX = 0; spaceX < numDashSpaces; spaceX++) {
rect.x += rect.width + dashLength;
rect.width = (spaceX == (numDashSpaces - 1)) ? endDashLength : dashLength;
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
}
}
else {
GetDashInfo(aBorder.height, dashLength, twipsPerPixel, numDashSpaces, startDashLength, endDashLength);
nsRect rect(aBorder.x, aBorder.y, aBorder.width, startDashLength);
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
for (int32_t spaceY = 0; spaceY < numDashSpaces; spaceY++) {
rect.y += rect.height + dashLength;
rect.height = (spaceY == (numDashSpaces - 1)) ? endDashLength : dashLength;
DrawSolidBorderSegment(aContext, rect, twipsPerPixel);
}
}
}
break;
case NS_STYLE_BORDER_STYLE_GROOVE:
ridgeGroove = NS_STYLE_BORDER_STYLE_GROOVE; // and fall through to ridge
case NS_STYLE_BORDER_STYLE_RIDGE:
if ((horizontal && (twipsPerPixel >= aBorder.height)) ||
(!horizontal && (twipsPerPixel >= aBorder.width))) {
// a one pixel border
DrawSolidBorderSegment(aContext, aBorder, twipsPerPixel, aStartBevelSide, aStartBevelOffset,
aEndBevelSide, aEndBevelOffset);
}
else {
nscoord startBevel = (aStartBevelOffset > 0)
? RoundFloatToPixel(0.5f * (float)aStartBevelOffset, twipsPerPixel, true) : 0;
nscoord endBevel = (aEndBevelOffset > 0)
? RoundFloatToPixel(0.5f * (float)aEndBevelOffset, twipsPerPixel, true) : 0;
mozilla::css::Side ridgeGrooveSide = (horizontal) ? NS_SIDE_TOP : NS_SIDE_LEFT;
// FIXME: In theory, this should use the visited-dependent
// background color, but I don't care.
aContext.SetColor (
MakeBevelColor(ridgeGrooveSide, ridgeGroove, aBGColor->mBackgroundColor, aBorderColor));
nsRect rect(aBorder);
nscoord half;
if (horizontal) { // top, bottom
half = RoundFloatToPixel(0.5f * (float)aBorder.height, twipsPerPixel);
rect.height = half;
if (NS_SIDE_TOP == aStartBevelSide) {
rect.x += startBevel;
rect.width -= startBevel;
}
if (NS_SIDE_TOP == aEndBevelSide) {
rect.width -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
else { // left, right
half = RoundFloatToPixel(0.5f * (float)aBorder.width, twipsPerPixel);
rect.width = half;
if (NS_SIDE_LEFT == aStartBevelSide) {
rect.y += startBevel;
rect.height -= startBevel;
}
if (NS_SIDE_LEFT == aEndBevelSide) {
rect.height -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
rect = aBorder;
ridgeGrooveSide = (NS_SIDE_TOP == ridgeGrooveSide) ? NS_SIDE_BOTTOM : NS_SIDE_RIGHT;
// FIXME: In theory, this should use the visited-dependent
// background color, but I don't care.
aContext.SetColor (
MakeBevelColor(ridgeGrooveSide, ridgeGroove, aBGColor->mBackgroundColor, aBorderColor));
if (horizontal) {
rect.y = rect.y + half;
rect.height = aBorder.height - half;
if (NS_SIDE_BOTTOM == aStartBevelSide) {
rect.x += startBevel;
rect.width -= startBevel;
}
if (NS_SIDE_BOTTOM == aEndBevelSide) {
rect.width -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
else {
rect.x = rect.x + half;
rect.width = aBorder.width - half;
if (NS_SIDE_RIGHT == aStartBevelSide) {
rect.y += aStartBevelOffset - startBevel;
rect.height -= startBevel;
}
if (NS_SIDE_RIGHT == aEndBevelSide) {
rect.height -= endBevel;
}
DrawSolidBorderSegment(aContext, rect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
}
break;
case NS_STYLE_BORDER_STYLE_DOUBLE:
// We can only do "double" borders if the thickness of the border
// is more than 2px. Otherwise, we fall through to painting a
// solid border.
if ((aBorder.width > 2*twipsPerPixel || horizontal) &&
(aBorder.height > 2*twipsPerPixel || !horizontal)) {
nscoord startBevel = (aStartBevelOffset > 0)
? RoundFloatToPixel(0.333333f * (float)aStartBevelOffset, twipsPerPixel) : 0;
nscoord endBevel = (aEndBevelOffset > 0)
? RoundFloatToPixel(0.333333f * (float)aEndBevelOffset, twipsPerPixel) : 0;
if (horizontal) { // top, bottom
nscoord thirdHeight = RoundFloatToPixel(0.333333f * (float)aBorder.height, twipsPerPixel);
// draw the top line or rect
nsRect topRect(aBorder.x, aBorder.y, aBorder.width, thirdHeight);
if (NS_SIDE_TOP == aStartBevelSide) {
topRect.x += aStartBevelOffset - startBevel;
topRect.width -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_TOP == aEndBevelSide) {
topRect.width -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, topRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
// draw the botom line or rect
nscoord heightOffset = aBorder.height - thirdHeight;
nsRect bottomRect(aBorder.x, aBorder.y + heightOffset, aBorder.width, aBorder.height - heightOffset);
if (NS_SIDE_BOTTOM == aStartBevelSide) {
bottomRect.x += aStartBevelOffset - startBevel;
bottomRect.width -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_BOTTOM == aEndBevelSide) {
bottomRect.width -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, bottomRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
else { // left, right
nscoord thirdWidth = RoundFloatToPixel(0.333333f * (float)aBorder.width, twipsPerPixel);
nsRect leftRect(aBorder.x, aBorder.y, thirdWidth, aBorder.height);
if (NS_SIDE_LEFT == aStartBevelSide) {
leftRect.y += aStartBevelOffset - startBevel;
leftRect.height -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_LEFT == aEndBevelSide) {
leftRect.height -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, leftRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
nscoord widthOffset = aBorder.width - thirdWidth;
nsRect rightRect(aBorder.x + widthOffset, aBorder.y, aBorder.width - widthOffset, aBorder.height);
if (NS_SIDE_RIGHT == aStartBevelSide) {
rightRect.y += aStartBevelOffset - startBevel;
rightRect.height -= aStartBevelOffset - startBevel;
}
if (NS_SIDE_RIGHT == aEndBevelSide) {
rightRect.height -= aEndBevelOffset - endBevel;
}
DrawSolidBorderSegment(aContext, rightRect, twipsPerPixel, aStartBevelSide,
startBevel, aEndBevelSide, endBevel);
}
break;
}
// else fall through to solid
case NS_STYLE_BORDER_STYLE_SOLID:
DrawSolidBorderSegment(aContext, aBorder, twipsPerPixel, aStartBevelSide,
aStartBevelOffset, aEndBevelSide, aEndBevelOffset);
break;
case NS_STYLE_BORDER_STYLE_OUTSET:
case NS_STYLE_BORDER_STYLE_INSET:
NS_ASSERTION(false, "inset, outset should have been converted to groove, ridge");
break;
case NS_STYLE_BORDER_STYLE_AUTO:
NS_ASSERTION(false, "Unexpected 'auto' table border");
break;
}
ctx->SetAntialiasMode(oldMode);
}
// End table border-collapsing section
gfxRect
nsCSSRendering::ExpandPaintingRectForDecorationLine(nsIFrame* aFrame,
const uint8_t aStyle,
const gfxRect& aClippedRect,
const gfxFloat aXInFrame,
const gfxFloat aCycleLength)
{
switch (aStyle) {
case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
case NS_STYLE_TEXT_DECORATION_STYLE_DASHED:
case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
break;
default:
NS_ERROR("Invalid style was specified");
return aClippedRect;
}
nsBlockFrame* block = nullptr;
// Note that when we paint the decoration lines in relative positioned
// box, we should paint them like all of the boxes are positioned as static.
nscoord relativeX = 0;
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
block = do_QueryFrame(f);
if (block) {
break;
}
relativeX += f->GetRelativeOffset(f->GetStyleDisplay()).x;
}
NS_ENSURE_TRUE(block, aClippedRect);
nscoord frameXInBlockAppUnits = aFrame->GetOffsetTo(block).x - relativeX;
nsPresContext *pc = aFrame->PresContext();
gfxFloat frameXInBlock = pc->AppUnitsToGfxUnits(frameXInBlockAppUnits);
int32_t rectXInBlock = int32_t(NS_round(frameXInBlock + aXInFrame));
int32_t extraLeft =
rectXInBlock - (rectXInBlock / int32_t(aCycleLength) * aCycleLength);
gfxRect rect(aClippedRect);
rect.x -= extraLeft;
rect.width += extraLeft;
return rect;
}
void
nsCSSRendering::PaintDecorationLine(nsIFrame* aFrame,
gfxContext* aGfxContext,
const gfxRect& aDirtyRect,
const nscolor aColor,
const gfxPoint& aPt,
const gfxFloat aXInFrame,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const uint8_t aDecoration,
const uint8_t aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE, "aStyle is none");
gfxRect rect =
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
aDecoration, aStyle, aDescentLimit);
if (rect.IsEmpty() || !rect.Intersects(aDirtyRect)) {
return;
}
if (aDecoration != NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_OVERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH) {
NS_ERROR("Invalid decoration value!");
return;
}
gfxFloat lineHeight = NS_MAX(NS_round(aLineSize.height), 1.0);
bool contextIsSaved = false;
gfxFloat oldLineWidth;
nsRefPtr<gfxPattern> oldPattern;
switch (aStyle) {
case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE:
oldLineWidth = aGfxContext->CurrentLineWidth();
oldPattern = aGfxContext->GetPattern();
break;
case NS_STYLE_TEXT_DECORATION_STYLE_DASHED: {
aGfxContext->Save();
contextIsSaved = true;
aGfxContext->Clip(rect);
gfxFloat dashWidth = lineHeight * DOT_LENGTH * DASH_LENGTH;
gfxFloat dash[2] = { dashWidth, dashWidth };
aGfxContext->SetLineCap(gfxContext::LINE_CAP_BUTT);
aGfxContext->SetDash(dash, 2, 0.0);
rect = ExpandPaintingRectForDecorationLine(aFrame, aStyle, rect,
aXInFrame, dashWidth * 2);
// We should continue to draw the last dash even if it is not in the rect.
rect.width += dashWidth;
break;
}
case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED: {
aGfxContext->Save();
contextIsSaved = true;
aGfxContext->Clip(rect);
gfxFloat dashWidth = lineHeight * DOT_LENGTH;
gfxFloat dash[2];
if (lineHeight > 2.0) {
dash[0] = 0.0;
dash[1] = dashWidth * 2.0;
aGfxContext->SetLineCap(gfxContext::LINE_CAP_ROUND);
} else {
dash[0] = dashWidth;
dash[1] = dashWidth;
}
aGfxContext->SetDash(dash, 2, 0.0);
rect = ExpandPaintingRectForDecorationLine(aFrame, aStyle, rect,
aXInFrame, dashWidth * 2);
// We should continue to draw the last dot even if it is not in the rect.
rect.width += dashWidth;
break;
}
case NS_STYLE_TEXT_DECORATION_STYLE_WAVY:
aGfxContext->Save();
contextIsSaved = true;
aGfxContext->Clip(rect);
if (lineHeight > 2.0) {
aGfxContext->SetAntialiasMode(gfxContext::MODE_COVERAGE);
} else {
// Don't use anti-aliasing here. Because looks like lighter color wavy
// line at this case. And probably, users don't think the
// non-anti-aliased wavy line is not pretty.
aGfxContext->SetAntialiasMode(gfxContext::MODE_ALIASED);
}
break;
default:
NS_ERROR("Invalid style value!");
return;
}
// The y position should be set to the middle of the line.
rect.y += lineHeight / 2;
aGfxContext->SetColor(gfxRGBA(aColor));
aGfxContext->SetLineWidth(lineHeight);
switch (aStyle) {
case NS_STYLE_TEXT_DECORATION_STYLE_SOLID:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE:
/**
* We are drawing double line as:
*
* +-------------------------------------------+
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* | |
* | |
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* +-------------------------------------------+
*/
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
rect.height -= lineHeight;
aGfxContext->MoveTo(rect.BottomLeft());
aGfxContext->LineTo(rect.BottomRight());
aGfxContext->Stroke();
break;
case NS_STYLE_TEXT_DECORATION_STYLE_DOTTED:
case NS_STYLE_TEXT_DECORATION_STYLE_DASHED:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case NS_STYLE_TEXT_DECORATION_STYLE_WAVY: {
/**
* We are drawing wavy line as:
*
* P: Path, X: Painted pixel
*
* +---------------------------------------+
* XX|X XXXXXX XXXXXX |
* PP|PX XPPPPPPX XPPPPPPX | ^
* XX|XPX XPXXXXXXPX XPXXXXXXPX| |
* | XPX XPX XPX XPX XP|X |adv
* | XPXXXXXXPX XPXXXXXXPX X|PX |
* | XPPPPPPX XPPPPPPX |XPX v
* | XXXXXX XXXXXX | XX
* +---------------------------------------+
* <---><---> ^
* adv flatLengthAtVertex rightMost
*
* 1. Always starts from top-left of the drawing area, however, we need
* to draw the line from outside of the rect. Because the start
* point of the line is not good style if we draw from inside it.
* 2. First, draw horizontal line from outside the rect to top-left of
* the rect;
* 3. Goes down to bottom of the area at 45 degrees.
* 4. Slides to right horizontaly, see |flatLengthAtVertex|.
* 5. Goes up to top of the area at 45 degrees.
* 6. Slides to right horizontaly.
* 7. Repeat from 2 until reached to right-most edge of the area.
*/
gfxFloat adv = rect.Height() - lineHeight;
gfxFloat flatLengthAtVertex = NS_MAX((lineHeight - 1.0) * 2.0, 1.0);
// Align the start of wavy lines to the nearest ancestor block.
gfxFloat cycleLength = 2 * (adv + flatLengthAtVertex);
rect = ExpandPaintingRectForDecorationLine(aFrame, aStyle, rect,
aXInFrame, cycleLength);
// figure out if we can trim whole cycles from the left and right edges
// of the line, to try and avoid creating an unnecessarily long and
// complex path
int32_t skipCycles = floor((aDirtyRect.x - rect.x) / cycleLength);
if (skipCycles > 0) {
rect.x += skipCycles * cycleLength;
rect.width -= skipCycles * cycleLength;
}
rect.x += lineHeight / 2.0;
gfxPoint pt(rect.TopLeft());
gfxFloat rightMost = pt.x + rect.Width() + lineHeight;
skipCycles = floor((rightMost - aDirtyRect.XMost()) / cycleLength);
if (skipCycles > 0) {
rightMost -= skipCycles * cycleLength;
}
aGfxContext->NewPath();
pt.x -= lineHeight;
aGfxContext->MoveTo(pt); // 1
pt.x = rect.X();
aGfxContext->LineTo(pt); // 2
bool goDown = true;
uint32_t iter = 0;
while (pt.x < rightMost) {
if (++iter > 1000) {
// stroke the current path and start again, to avoid pathological
// behavior in cairo with huge numbers of path segments
aGfxContext->Stroke();
aGfxContext->NewPath();
aGfxContext->MoveTo(pt);
iter = 0;
}
pt.x += adv;
pt.y += goDown ? adv : -adv;
aGfxContext->LineTo(pt); // 3 and 5
pt.x += flatLengthAtVertex;
aGfxContext->LineTo(pt); // 4 and 6
goDown = !goDown;
}
aGfxContext->Stroke();
break;
}
default:
NS_ERROR("Invalid style value!");
break;
}
if (contextIsSaved) {
aGfxContext->Restore();
} else {
aGfxContext->SetPattern(oldPattern);
aGfxContext->SetLineWidth(oldLineWidth);
}
}
void
nsCSSRendering::DecorationLineToPath(nsIFrame* aFrame,
gfxContext* aGfxContext,
const gfxRect& aDirtyRect,
const nscolor aColor,
const gfxPoint& aPt,
const gfxFloat aXInFrame,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const uint8_t aDecoration,
const uint8_t aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE, "aStyle is none");
aGfxContext->NewPath();
gfxRect rect =
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
aDecoration, aStyle, aDescentLimit);
if (rect.IsEmpty() || !rect.Intersects(aDirtyRect)) {
return;
}
if (aDecoration != NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_OVERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH) {
NS_ERROR("Invalid decoration value!");
return;
}
if (aStyle != NS_STYLE_TEXT_DECORATION_STYLE_SOLID) {
// For the moment, we support only solid text decorations.
return;
}
gfxFloat lineHeight = NS_MAX(NS_round(aLineSize.height), 1.0);
// The y position should be set to the middle of the line.
rect.y += lineHeight / 2;
aGfxContext->Rectangle
(gfxRect(gfxPoint(rect.TopLeft() - gfxPoint(0.0, lineHeight / 2)),
gfxSize(rect.Width(), lineHeight)));
}
nsRect
nsCSSRendering::GetTextDecorationRect(nsPresContext* aPresContext,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const uint8_t aDecoration,
const uint8_t aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aPresContext, "aPresContext is null");
NS_ASSERTION(aStyle != NS_STYLE_TEXT_DECORATION_STYLE_NONE, "aStyle is none");
gfxRect rect =
GetTextDecorationRectInternal(gfxPoint(0, 0), aLineSize, aAscent, aOffset,
aDecoration, aStyle, aDescentLimit);
// The rect values are already rounded to nearest device pixels.
nsRect r;
r.x = aPresContext->GfxUnitsToAppUnits(rect.X());
r.y = aPresContext->GfxUnitsToAppUnits(rect.Y());
r.width = aPresContext->GfxUnitsToAppUnits(rect.Width());
r.height = aPresContext->GfxUnitsToAppUnits(rect.Height());
return r;
}
gfxRect
nsCSSRendering::GetTextDecorationRectInternal(const gfxPoint& aPt,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const uint8_t aDecoration,
const uint8_t aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle <= NS_STYLE_TEXT_DECORATION_STYLE_WAVY,
"Invalid aStyle value");
if (aStyle == NS_STYLE_TEXT_DECORATION_STYLE_NONE)
return gfxRect(0, 0, 0, 0);
bool canLiftUnderline = aDescentLimit >= 0.0;
const gfxFloat left = floor(aPt.x + 0.5),
right = floor(aPt.x + aLineSize.width + 0.5);
gfxRect r(left, 0, right - left, 0);
gfxFloat lineHeight = NS_round(aLineSize.height);
lineHeight = NS_MAX(lineHeight, 1.0);
gfxFloat ascent = NS_round(aAscent);
gfxFloat descentLimit = floor(aDescentLimit);
gfxFloat suggestedMaxRectHeight = NS_MAX(NS_MIN(ascent, descentLimit), 1.0);
r.height = lineHeight;
if (aStyle == NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE) {
/**
* We will draw double line as:
*
* +-------------------------------------------+
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* | | ^
* | | | gap
* | | v
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| ^
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| | lineHeight
* |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX| v
* +-------------------------------------------+
*/
gfxFloat gap = NS_round(lineHeight / 2.0);
gap = NS_MAX(gap, 1.0);
r.height = lineHeight * 2.0 + gap;
if (canLiftUnderline) {
if (r.Height() > suggestedMaxRectHeight) {
// Don't shrink the line height, because the thickness has some meaning.
// We can just shrink the gap at this time.
r.height = NS_MAX(suggestedMaxRectHeight, lineHeight * 2.0 + 1.0);
}
}
} else if (aStyle == NS_STYLE_TEXT_DECORATION_STYLE_WAVY) {
/**
* We will draw wavy line as:
*
* +-------------------------------------------+
* |XXXXX XXXXXX XXXXXX | ^
* |XXXXXX XXXXXXXX XXXXXXXX | | lineHeight
* |XXXXXXX XXXXXXXXXX XXXXXXXXXX| v
* | XXX XXX XXX XXX XX|
* | XXXXXXXXXX XXXXXXXXXX X|
* | XXXXXXXX XXXXXXXX |
* | XXXXXX XXXXXX |
* +-------------------------------------------+
*/
r.height = lineHeight > 2.0 ? lineHeight * 4.0 : lineHeight * 3.0;
if (canLiftUnderline) {
if (r.Height() > suggestedMaxRectHeight) {
// Don't shrink the line height even if there is not enough space,
// because the thickness has some meaning. E.g., the 1px wavy line and
// 2px wavy line can be used for different meaning in IME selections
// at same time.
r.height = NS_MAX(suggestedMaxRectHeight, lineHeight * 2.0);
}
}
}
gfxFloat baseline = floor(aPt.y + aAscent + 0.5);
gfxFloat offset = 0.0;
switch (aDecoration) {
case NS_STYLE_TEXT_DECORATION_LINE_UNDERLINE:
offset = aOffset;
if (canLiftUnderline) {
if (descentLimit < -offset + r.Height()) {
// If we can ignore the offset and the decoration line is overflowing,
// we should align the bottom edge of the decoration line rect if it's
// possible. Otherwise, we should lift up the top edge of the rect as
// far as possible.
gfxFloat offsetBottomAligned = -descentLimit + r.Height();
gfxFloat offsetTopAligned = 0.0;
offset = NS_MIN(offsetBottomAligned, offsetTopAligned);
}
}
break;
case NS_STYLE_TEXT_DECORATION_LINE_OVERLINE:
offset = aOffset - lineHeight + r.Height();
break;
case NS_STYLE_TEXT_DECORATION_LINE_LINE_THROUGH: {
gfxFloat extra = floor(r.Height() / 2.0 + 0.5);
extra = NS_MAX(extra, lineHeight);
offset = aOffset - lineHeight + extra;
break;
}
default:
NS_ERROR("Invalid decoration value!");
}
r.y = baseline - floor(offset + 0.5);
return r;
}
// ------------------
// ImageRenderer
// ------------------
nsImageRenderer::nsImageRenderer(nsIFrame* aForFrame,
const nsStyleImage* aImage,
uint32_t aFlags)
: mForFrame(aForFrame)
, mImage(aImage)
, mType(aImage->GetType())
, mImageContainer(nullptr)
, mGradientData(nullptr)
, mPaintServerFrame(nullptr)
, mIsReady(false)
, mSize(0, 0)
, mFlags(aFlags)
{
}
nsImageRenderer::~nsImageRenderer()
{
}
bool
nsImageRenderer::PrepareImage()
{
if (mImage->IsEmpty())
return false;
if (!mImage->IsComplete()) {
// Make sure the image is actually decoding
mImage->StartDecoding();
// check again to see if we finished
if (!mImage->IsComplete()) {
// We can not prepare the image for rendering if it is not fully loaded.
//
// Special case: If we requested a sync decode and we have an image, push
// on through because the Draw() will do a sync decode then
nsCOMPtr<imgIContainer> img;
if (!((mFlags & FLAG_SYNC_DECODE_IMAGES) &&
(mType == eStyleImageType_Image) &&
(NS_SUCCEEDED(mImage->GetImageData()->GetImage(getter_AddRefs(img))))))
return false;
}
}
switch (mType) {
case eStyleImageType_Image:
{
nsCOMPtr<imgIContainer> srcImage;
DebugOnly<nsresult> rv =
mImage->GetImageData()->GetImage(getter_AddRefs(srcImage));
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv) && srcImage,
"If GetImage() is failing, mImage->IsComplete() "
"should have returned false");
if (!mImage->GetCropRect()) {
mImageContainer.swap(srcImage);
} else {
nsIntRect actualCropRect;
bool isEntireImage;
bool success =
mImage->ComputeActualCropRect(actualCropRect, &isEntireImage);
NS_ASSERTION(success, "ComputeActualCropRect() should not fail here");
if (!success || actualCropRect.IsEmpty()) {
// The cropped image has zero size
return false;
}
if (isEntireImage) {
// The cropped image is identical to the source image
mImageContainer.swap(srcImage);
} else {
nsCOMPtr<imgIContainer> subImage;
uint32_t aExtractFlags = (mFlags & FLAG_SYNC_DECODE_IMAGES)
? (uint32_t) imgIContainer::FLAG_SYNC_DECODE
: (uint32_t) imgIContainer::FLAG_NONE;
nsresult rv = srcImage->ExtractFrame(imgIContainer::FRAME_CURRENT,
actualCropRect, aExtractFlags,
getter_AddRefs(subImage));
if (NS_FAILED(rv)) {
NS_WARNING("The cropped image contains no pixels to draw; "
"maybe the crop rect is outside the image frame rect");
return false;
}
mImageContainer.swap(subImage);
}
}
mIsReady = true;
break;
}
case eStyleImageType_Gradient:
mGradientData = mImage->GetGradientData();
mIsReady = true;
break;
case eStyleImageType_Element:
{
nsAutoString elementId =
NS_LITERAL_STRING("#") + nsDependentString(mImage->GetElementId());
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mForFrame->GetContent()->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), elementId,
mForFrame->GetContent()->GetCurrentDoc(), base);
nsSVGPaintingProperty* property = nsSVGEffects::GetPaintingPropertyForURI(
targetURI, mForFrame->GetFirstContinuation(),
nsSVGEffects::BackgroundImageProperty());
if (!property)
return false;
mPaintServerFrame = property->GetReferencedFrame();
// If the referenced element doesn't have a frame we might still be able
// to paint it if it's an <img>, <canvas>, or <video> element.
if (!mPaintServerFrame) {
mImageElementSurface =
nsLayoutUtils::SurfaceFromElement(property->GetReferencedElement());
if (!mImageElementSurface.mSurface)
return false;
}
mIsReady = true;
break;
}
case eStyleImageType_Null:
default:
break;
}
return mIsReady;
}
enum FitType { CONTAIN, COVER };
static nsSize
ComputeContainCoverSizeFromRatio(const nsSize& aBgPositioningArea,
const nsSize& aRatio, FitType fitType)
{
NS_ABORT_IF_FALSE(aRatio.width > 0, "width division by zero");
NS_ABORT_IF_FALSE(aRatio.height > 0, "height division by zero");
float scaleX = double(aBgPositioningArea.width) / aRatio.width;
float scaleY = double(aBgPositioningArea.height) / aRatio.height;
nsSize size;
if ((fitType == CONTAIN) == (scaleX < scaleY)) {
size.width = aBgPositioningArea.width;
size.height = NSCoordSaturatingNonnegativeMultiply(aRatio.height, scaleX);
} else {
size.width = NSCoordSaturatingNonnegativeMultiply(aRatio.width, scaleY);
size.height = aBgPositioningArea.height;
}
return size;
}
void
nsImageRenderer::ComputeUnscaledDimensions(const nsSize& aBgPositioningArea,
nscoord& aUnscaledWidth, bool& aHaveWidth,
nscoord& aUnscaledHeight, bool& aHaveHeight,
nsSize& aRatio)
{
NS_ASSERTION(mIsReady, "Ensure PrepareImage() has returned true "
"before calling me");
switch (mType) {
case eStyleImageType_Image:
{
nsIntSize imageIntSize;
nsLayoutUtils::ComputeSizeForDrawing(mImageContainer, imageIntSize,
aRatio, aHaveWidth, aHaveHeight);
if (aHaveWidth) {
aUnscaledWidth = nsPresContext::CSSPixelsToAppUnits(imageIntSize.width);
}
if (aHaveHeight) {
aUnscaledHeight = nsPresContext::CSSPixelsToAppUnits(imageIntSize.height);
}
return;
}
case eStyleImageType_Gradient:
// Per <http://dev.w3.org/csswg/css3-images/#gradients>, gradients have no
// intrinsic dimensions.
aHaveWidth = aHaveHeight = false;
aRatio = nsSize(0, 0);
return;
case eStyleImageType_Element:
{
// XXX element() should have the width/height of the referenced element,
// and that element's ratio, if it matches. If it doesn't match, it
// should have no width/height or ratio. See element() in CSS3:
// <http://dev.w3.org/csswg/css3-images/#element-reference>.
// Make sure to change nsStyleBackground::Size::DependsOnFrameSize
// when fixing this!
aHaveWidth = aHaveHeight = true;
nsSize size;
if (mPaintServerFrame) {
if (mPaintServerFrame->IsFrameOfType(nsIFrame::eSVG)) {
size = aBgPositioningArea;
} else {
// The intrinsic image size for a generic nsIFrame paint server is
// the union of the border-box rects of all of its continuations,
// rounded to device pixels.
int32_t appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
size =
nsSVGIntegrationUtils::GetContinuationUnionSize(mPaintServerFrame).
ToNearestPixels(appUnitsPerDevPixel).
ToAppUnits(appUnitsPerDevPixel);
}
} else {
NS_ASSERTION(mImageElementSurface.mSurface, "Surface should be ready.");
gfxIntSize surfaceSize = mImageElementSurface.mSize;
size.width = nsPresContext::CSSPixelsToAppUnits(surfaceSize.width);
size.height = nsPresContext::CSSPixelsToAppUnits(surfaceSize.height);
}
aRatio = size;
aUnscaledWidth = size.width;
aUnscaledHeight = size.height;
return;
}
case eStyleImageType_Null:
default:
aHaveWidth = aHaveHeight = true;
aUnscaledWidth = aUnscaledHeight = 0;
aRatio = nsSize(0, 0);
return;
}
}
nsSize
nsImageRenderer::ComputeDrawnSize(const nsStyleBackground::Size& aLayerSize,
const nsSize& aBgPositioningArea,
nscoord aUnscaledWidth, bool aHaveWidth,
nscoord aUnscaledHeight, bool aHaveHeight,
const nsSize& aIntrinsicRatio)
{
NS_ABORT_IF_FALSE(aIntrinsicRatio.width >= 0,
"image ratio with nonsense width");
NS_ABORT_IF_FALSE(aIntrinsicRatio.height >= 0,
"image ratio with nonsense height");
// Bail early if the image is empty.
if ((aHaveWidth && aUnscaledWidth <= 0) ||
(aHaveHeight && aUnscaledHeight <= 0)) {
return nsSize(0, 0);
}
// If the image has an intrinsic ratio but either component of it is zero,
// then the image would eventually scale to nothingness, so again we can bail.
bool haveRatio = aIntrinsicRatio != nsSize(0, 0);
if (haveRatio &&
(aIntrinsicRatio.width == 0 || aIntrinsicRatio.height == 0)) {
return nsSize(0, 0);
}
// Easiest case: background-size completely specifies the size.
if (aLayerSize.mWidthType == nsStyleBackground::Size::eLengthPercentage &&
aLayerSize.mHeightType == nsStyleBackground::Size::eLengthPercentage) {
return nsSize(aLayerSize.ResolveWidthLengthPercentage(aBgPositioningArea),
aLayerSize.ResolveHeightLengthPercentage(aBgPositioningArea));
}
// The harder cases: contain/cover.
if (aLayerSize.mWidthType == nsStyleBackground::Size::eContain ||
aLayerSize.mWidthType == nsStyleBackground::Size::eCover) {
FitType fitType = aLayerSize.mWidthType == nsStyleBackground::Size::eCover
? COVER
: CONTAIN;
if (!haveRatio) {
// If we don't have an intrinsic ratio, then proportionally scaling to
// either largest-fitting or smallest-covering size means scaling to the
// background positioning area's size.
return aBgPositioningArea;
}
return ComputeContainCoverSizeFromRatio(aBgPositioningArea, aIntrinsicRatio,
fitType);
}
// Harder case: all-auto.
if (aLayerSize.mWidthType == nsStyleBackground::Size::eAuto &&
aLayerSize.mHeightType == nsStyleBackground::Size::eAuto) {
// If the image has all its dimensions, we're done.
if (aHaveWidth && aHaveHeight)
return nsSize(aUnscaledWidth, aUnscaledHeight);
// If the image has no dimensions, treat it as if for contain.
if (!aHaveWidth && !aHaveHeight) {
if (!haveRatio) {
// As above, max-contain without a ratio means the whole area.
return aBgPositioningArea;
}
// Otherwise determine size using the intrinsic ratio.
return ComputeContainCoverSizeFromRatio(aBgPositioningArea,
aIntrinsicRatio, CONTAIN);
}
NS_ABORT_IF_FALSE(aHaveWidth != aHaveHeight, "logic error");
if (haveRatio) {
// Resolve missing dimensions using the intrinsic ratio.
nsSize size;
if (aHaveWidth) {
size.width = aUnscaledWidth;
size.height =
NSCoordSaturatingNonnegativeMultiply(size.width,
double(aIntrinsicRatio.height) /
aIntrinsicRatio.width);
} else {
size.height = aUnscaledHeight;
size.width =
NSCoordSaturatingNonnegativeMultiply(size.height,
double(aIntrinsicRatio.width) /
aIntrinsicRatio.height);
}
return size;
}
// Without a ratio we must fall back to the relevant dimension of the
// area to determine the missing dimension.
return aHaveWidth ? nsSize(aUnscaledWidth, aBgPositioningArea.height)
: nsSize(aBgPositioningArea.width, aUnscaledHeight);
}
// Hardest case: only one auto. Prepare to negotiate amongst intrinsic
// dimensions, intrinsic ratio, *and* a specific background-size!
NS_ABORT_IF_FALSE((aLayerSize.mWidthType == nsStyleBackground::Size::eAuto) !=
(aLayerSize.mHeightType == nsStyleBackground::Size::eAuto),
"logic error");
bool isAutoWidth = aLayerSize.mWidthType == nsStyleBackground::Size::eAuto;
if (haveRatio) {
// Use the specified dimension, and compute the other from the ratio.
NS_ABORT_IF_FALSE(aIntrinsicRatio.width > 0,
"ratio width out of sync with width?");
NS_ABORT_IF_FALSE(aIntrinsicRatio.height > 0,
"ratio height out of sync with width?");
nsSize size;
if (isAutoWidth) {
size.height = aLayerSize.ResolveHeightLengthPercentage(aBgPositioningArea);
size.width =
NSCoordSaturatingNonnegativeMultiply(size.height,
double(aIntrinsicRatio.width) /
aIntrinsicRatio.height);
} else {
size.width = aLayerSize.ResolveWidthLengthPercentage(aBgPositioningArea);
size.height =
NSCoordSaturatingNonnegativeMultiply(size.width,
double(aIntrinsicRatio.height) /
aIntrinsicRatio.width);
}
return size;
}
NS_ABORT_IF_FALSE(!(aHaveWidth && aHaveHeight),
"if we have width and height, we must have had a ratio");
// We have a specified dimension and an auto dimension, with no ratio to
// preserve. A specified dimension trumps all, so use that. For the other
// dimension, resolve auto to the intrinsic dimension (if present) or to 100%.
nsSize size;
if (isAutoWidth) {
size.width = aHaveWidth ? aUnscaledWidth : aBgPositioningArea.width;
size.height = aLayerSize.ResolveHeightLengthPercentage(aBgPositioningArea);
} else {
size.width = aLayerSize.ResolveWidthLengthPercentage(aBgPositioningArea);
size.height = aHaveHeight ? aUnscaledHeight : aBgPositioningArea.height;
}
return size;
}
/*
* The size returned by this method differs from the value of mSize, which this
* method also computes, in that mSize is the image's "preferred" size for this
* particular rendering, while the size returned here is the actual rendered
* size after accounting for background-size. The preferred size is most often
* the image's intrinsic dimensions. But for images with incomplete intrinsic
* dimensions, the preferred size varies, depending on the background
* positioning area, the specified background-size, and the intrinsic ratio and
* dimensions of the image (if it has them).
*
* This distinction is necessary because the components of a vector image are
* specified with respect to its preferred size for a rendering situation, not
* to its actual rendered size after background-size is applied. For example,
* consider a 4px wide vector image with no height which contains a left-aligned
* 2px wide black rectangle with height 100%. If the background-size width is
* auto (or 4px), the vector image will render 4px wide, and the black rectangle
* will be 2px wide. If the background-size width is 8px, the vector image will
* render 8px wide, and the black rectangle will be 4px wide -- *not* 2px wide.
* In both cases mSize.width will be 4px; but in the first case the returned
* width will be 4px, while in the second case the returned width will be 8px.
*/
nsSize
nsImageRenderer::ComputeSize(const nsStyleBackground::Size& aLayerSize,
const nsSize& aBgPositioningArea)
{
bool haveWidth, haveHeight;
nsSize ratio;
nscoord unscaledWidth, unscaledHeight;
ComputeUnscaledDimensions(aBgPositioningArea,
unscaledWidth, haveWidth,
unscaledHeight, haveHeight,
ratio);
nsSize drawnSize = ComputeDrawnSize(aLayerSize, aBgPositioningArea,
unscaledWidth, haveWidth,
unscaledHeight, haveHeight,
ratio);
mSize.width = haveWidth ? unscaledWidth : drawnSize.width;
mSize.height = haveHeight ? unscaledHeight : drawnSize.height;
return drawnSize;
}
void
nsImageRenderer::Draw(nsPresContext* aPresContext,
nsRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty)
{
if (!mIsReady) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0)
return;
gfxPattern::GraphicsFilter graphicsFilter =
nsLayoutUtils::GetGraphicsFilterForFrame(mForFrame);
switch (mType) {
case eStyleImageType_Image:
{
uint32_t drawFlags = (mFlags & FLAG_SYNC_DECODE_IMAGES)
? (uint32_t) imgIContainer::FLAG_SYNC_DECODE
: (uint32_t) imgIContainer::FLAG_NONE;
nsLayoutUtils::DrawBackgroundImage(&aRenderingContext, mImageContainer,
nsIntSize(nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
graphicsFilter,
aDest, aFill, aAnchor, aDirty, drawFlags);
break;
}
case eStyleImageType_Gradient:
nsCSSRendering::PaintGradient(aPresContext, aRenderingContext,
mGradientData, aDirty, aDest, aFill);
break;
case eStyleImageType_Element:
if (mPaintServerFrame) {
nsSVGIntegrationUtils::DrawPaintServer(
&aRenderingContext, mForFrame, mPaintServerFrame, graphicsFilter,
aDest, aFill, aAnchor, aDirty, mSize);
} else {
NS_ASSERTION(mImageElementSurface.mSurface, "Surface should be ready.");
nsRefPtr<gfxDrawable> surfaceDrawable =
new gfxSurfaceDrawable(mImageElementSurface.mSurface,
mImageElementSurface.mSize);
nsLayoutUtils::DrawPixelSnapped(
&aRenderingContext, surfaceDrawable, graphicsFilter,
aDest, aFill, aAnchor, aDirty);
}
break;
case eStyleImageType_Null:
default:
break;
}
}
bool
nsImageRenderer::IsRasterImage()
{
if (mType != eStyleImageType_Image)
return false;
nsCOMPtr<imgIContainer> img;
if (NS_FAILED(mImage->GetImageData()->GetImage(getter_AddRefs(img))))
return false;
return img->GetType() == imgIContainer::TYPE_RASTER;
}
already_AddRefed<mozilla::layers::ImageContainer>
nsImageRenderer::GetContainer()
{
if (mType != eStyleImageType_Image)
return nullptr;
nsCOMPtr<imgIContainer> img;
nsresult rv = mImage->GetImageData()->GetImage(getter_AddRefs(img));
if (NS_FAILED(rv))
return nullptr;
nsRefPtr<ImageContainer> container;
rv = img->GetImageContainer(getter_AddRefs(container));
NS_ENSURE_SUCCESS(rv, nullptr);
return container.forget();
}
#define MAX_BLUR_RADIUS 300
#define MAX_SPREAD_RADIUS 50
static inline gfxIntSize
ComputeBlurRadius(nscoord aBlurRadius, int32_t aAppUnitsPerDevPixel, gfxFloat aScaleX = 1.0, gfxFloat aScaleY = 1.0)
{
// http://dev.w3.org/csswg/css3-background/#box-shadow says that the
// standard deviation of the blur should be half the given blur value.
gfxFloat blurStdDev = gfxFloat(aBlurRadius) / gfxFloat(aAppUnitsPerDevPixel);
gfxPoint scaledBlurStdDev = gfxPoint(NS_MIN((blurStdDev * aScaleX),
gfxFloat(MAX_BLUR_RADIUS)) / 2.0,
NS_MIN((blurStdDev * aScaleY),
gfxFloat(MAX_BLUR_RADIUS)) / 2.0);
return
gfxAlphaBoxBlur::CalculateBlurRadius(scaledBlurStdDev);
}
// -----
// nsContextBoxBlur
// -----
gfxContext*
nsContextBoxBlur::Init(const nsRect& aRect, nscoord aSpreadRadius,
nscoord aBlurRadius,
int32_t aAppUnitsPerDevPixel,
gfxContext* aDestinationCtx,
const nsRect& aDirtyRect,
const gfxRect* aSkipRect,
uint32_t aFlags)
{
if (aRect.IsEmpty()) {
mContext = nullptr;
return nullptr;
}
gfxFloat scaleX = 1;
gfxFloat scaleY = 1;
// Do blurs in device space when possible.
// Chrome/Skia always does the blurs in device space
// and will sometimes get incorrect results (e.g. rotated blurs)
gfxMatrix transform = aDestinationCtx->CurrentMatrix();
// XXX: we could probably handle negative scales but for now it's easier just to fallback
if (transform.HasNonAxisAlignedTransform() || transform.xx <= 0.0 || transform.yy <= 0.0) {
transform = gfxMatrix();
} else {
scaleX = transform.xx;
scaleY = transform.yy;
}
// compute a large or smaller blur radius
gfxIntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel, scaleX, scaleY);
gfxIntSize spreadRadius = gfxIntSize(NS_MIN(int32_t(aSpreadRadius * scaleX / aAppUnitsPerDevPixel),
int32_t(MAX_SPREAD_RADIUS)),
NS_MIN(int32_t(aSpreadRadius * scaleY / aAppUnitsPerDevPixel),
int32_t(MAX_SPREAD_RADIUS)));
mDestinationCtx = aDestinationCtx;
// If not blurring, draw directly onto the destination device
if (blurRadius.width <= 0 && blurRadius.height <= 0 &&
spreadRadius.width <= 0 && spreadRadius.height <= 0 &&
!(aFlags & FORCE_MASK)) {
mContext = aDestinationCtx;
return mContext;
}
// Convert from app units to device pixels
gfxRect rect = nsLayoutUtils::RectToGfxRect(aRect, aAppUnitsPerDevPixel);
gfxRect dirtyRect =
nsLayoutUtils::RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
dirtyRect.RoundOut();
rect = transform.TransformBounds(rect);
mPreTransformed = !transform.IsIdentity();
// Create the temporary surface for blurring
dirtyRect = transform.TransformBounds(dirtyRect);
if (aSkipRect) {
gfxRect skipRect = transform.TransformBounds(*aSkipRect);
mContext = blur.Init(rect, spreadRadius,
blurRadius, &dirtyRect, &skipRect);
} else {
mContext = blur.Init(rect, spreadRadius,
blurRadius, &dirtyRect, NULL);
}
if (mContext) {
// we don't need to blur if skipRect is equal to rect
// and mContext will be NULL
mContext->SetMatrix(transform);
}
return mContext;
}
void
nsContextBoxBlur::DoPaint()
{
if (mContext == mDestinationCtx)
return;
gfxContextMatrixAutoSaveRestore saveMatrix(mDestinationCtx);
if (mPreTransformed) {
mDestinationCtx->IdentityMatrix();
}
blur.Paint(mDestinationCtx);
}
gfxContext*
nsContextBoxBlur::GetContext()
{
return mContext;
}
/* static */ nsMargin
nsContextBoxBlur::GetBlurRadiusMargin(nscoord aBlurRadius,
int32_t aAppUnitsPerDevPixel)
{
gfxIntSize blurRadius = ComputeBlurRadius(aBlurRadius, aAppUnitsPerDevPixel);
nsMargin result;
result.top = blurRadius.height * aAppUnitsPerDevPixel;
result.right = blurRadius.width * aAppUnitsPerDevPixel;
result.bottom = blurRadius.height * aAppUnitsPerDevPixel;
result.left = blurRadius.width * aAppUnitsPerDevPixel;
return result;
}
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