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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:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Mats Palmgren <mats.palmgren@bredband.net>
* Takeshi Ichimaru <ayakawa.m@gmail.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
* Michael Ventnor <m.ventnor@gmail.com>
* Rob Arnold <robarnold@mozilla.com>
* Jeff Walden <jwalden+code@mit.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* 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 "nsIDeviceContext.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 "nsIHTMLDocument.h"
#include "nsLayoutUtils.h"
#include "nsINameSpaceManager.h"
#include "nsBlockFrame.h"
#include "gfxContext.h"
#include "nsIInterfaceRequestorUtils.h"
#include "gfxPlatform.h"
#include "gfxImageSurface.h"
#include "nsStyleStructInlines.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsCSSRenderingBorders.h"
/**
* This is a small wrapper class to encapsulate image drawing that can draw an
* nsStyleImage image, which may internally be a real image, a sub image, or a
* CSS gradient.
*
* @note Always call the member functions in the order of PrepareImage(),
* ComputeSize(), and Draw().
*/
class ImageRenderer {
public:
enum {
FLAG_SYNC_DECODE_IMAGES = 0x01
};
ImageRenderer(nsIFrame* aForFrame, const nsStyleImage& aImage, PRUint32 aFlags);
~ImageRenderer();
/**
* Populates member variables to get ready for rendering.
* @return PR_TRUE iff the image is ready, and there is at least a pixel to
* draw.
*/
PRBool PrepareImage();
/**
* @return the image size in appunits. CSS gradient images don't have an
* intrinsic size so we have to pass in a default that they will use.
*/
nsSize ComputeSize(const nsSize& aDefault);
/**
* Draws the image to the target rendering context.
* @see nsLayoutUtils::DrawImage() for other parameters
*/
void Draw(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty);
private:
nsIFrame* mForFrame;
nsStyleImage mImage;
nsStyleImageType mType;
nsCOMPtr<imgIContainer> mImageContainer;
nsRefPtr<nsStyleGradient> mGradientData;
PRBool mIsReady;
nsSize mSize;
PRUint32 mFlags;
};
// 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(nsnull), mBlockFrame(nsnull)
{
}
~InlineBackgroundData()
{
}
void Reset()
{
mBoundingBox.SetRect(0,0,0,0);
mContinuationPoint = mLineContinuationPoint = mUnbrokenWidth = 0;
mFrame = mBlockFrame = nsnull;
}
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.
PRBool 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;
PRBool 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;
}
}
PRBool AreOnSameLine(nsIFrame* aFrame1, nsIFrame* aFrame2) {
// Assumes that aFrame1 and aFrame2 are both decsendants of mBlockFrame.
PRBool isValid1, isValid2;
nsBlockInFlowLineIterator it1(mBlockFrame, aFrame1, &isValid1);
nsBlockInFlowLineIterator it2(mBlockFrame, aFrame2, &isValid2);
return isValid1 && isValid2 && it1.GetLine() == it2.GetLine();
}
};
/* Local functions */
static void PaintBackgroundLayer(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
PRUint32 aFlags,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsRect& aBGClipRect,
const nsStyleBackground& aBackground,
const nsStyleBackground::Layer& aLayer);
static void DrawBorderImage(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
const nsRect& aDirtyRect);
static void DrawBorderImageComponent(nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
imgIContainer* aImage,
const nsRect& aDirtyRect,
const nsRect& aFill,
const nsIntRect& aSrc,
PRUint8 aHFill,
PRUint8 aVFill,
const nsSize& aUnitSize,
const nsStyleBorder& aStyleBorder,
PRUint8 aIndex);
static nscolor MakeBevelColor(mozilla::css::Side whichSide, PRUint8 style,
nscolor aBackgroundColor,
nscolor aBorderColor);
static InlineBackgroundData* gInlineBGData = nsnull;
// Initialize any static variables used by nsCSSRendering.
nsresult nsCSSRendering::Init()
{
NS_ASSERTION(!gInlineBGData, "Init called twice");
gInlineBGData = new InlineBackgroundData();
if (!gInlineBGData)
return NS_ERROR_OUT_OF_MEMORY;
return NS_OK;
}
// Clean up any global variables used by nsCSSRendering.
void nsCSSRendering::Shutdown()
{
delete gInlineBGData;
gInlineBGData = nsnull;
}
/**
* Make a bevel color
*/
static nscolor
MakeBevelColor(mozilla::css::Side whichSide, PRUint8 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
// helper function to convert a nsRect to a gfxRect
static gfxRect
RectToGfxRect(const nsRect& rect, nscoord twipsPerPixel)
{
return gfxRect(gfxFloat(rect.x) / twipsPerPixel,
gfxFloat(rect.y) / twipsPerPixel,
gfxFloat(rect.width) / twipsPerPixel,
gfxFloat(rect.height) / twipsPerPixel);
}
/*
* Compute the float-pixel radii that should be used for drawing
* this border/outline, given the various input bits.
*
* If a side is skipped via skipSides, its corners are forced to 0.
* All corner radii are then adjusted so they do not require more
* space than outerRect, according to the algorithm in css3-background.
*/
static void
ComputePixelRadii(const nscoord *aTwipsRadii,
const nsRect& outerRect,
PRIntn skipSides,
nscoord twipsPerPixel,
gfxCornerSizes *oBorderRadii)
{
nscoord twipsRadii[8];
memcpy(twipsRadii, aTwipsRadii, sizeof twipsRadii);
if (skipSides & SIDE_BIT_TOP) {
twipsRadii[NS_CORNER_TOP_LEFT_X] = 0;
twipsRadii[NS_CORNER_TOP_LEFT_Y] = 0;
twipsRadii[NS_CORNER_TOP_RIGHT_X] = 0;
twipsRadii[NS_CORNER_TOP_RIGHT_Y] = 0;
}
if (skipSides & SIDE_BIT_RIGHT) {
twipsRadii[NS_CORNER_TOP_RIGHT_X] = 0;
twipsRadii[NS_CORNER_TOP_RIGHT_Y] = 0;
twipsRadii[NS_CORNER_BOTTOM_RIGHT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_RIGHT_Y] = 0;
}
if (skipSides & SIDE_BIT_BOTTOM) {
twipsRadii[NS_CORNER_BOTTOM_RIGHT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_RIGHT_Y] = 0;
twipsRadii[NS_CORNER_BOTTOM_LEFT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_LEFT_Y] = 0;
}
if (skipSides & SIDE_BIT_LEFT) {
twipsRadii[NS_CORNER_BOTTOM_LEFT_X] = 0;
twipsRadii[NS_CORNER_BOTTOM_LEFT_Y] = 0;
twipsRadii[NS_CORNER_TOP_LEFT_X] = 0;
twipsRadii[NS_CORNER_TOP_LEFT_Y] = 0;
}
gfxFloat radii[8];
NS_FOR_CSS_HALF_CORNERS(corner)
radii[corner] = twipsRadii[corner] / twipsPerPixel;
// css3-background specifies this algorithm for reducing
// corner radii when they are too big.
gfxFloat maxWidth = outerRect.width / twipsPerPixel;
gfxFloat maxHeight = outerRect.height / twipsPerPixel;
gfxFloat f = 1.0f;
NS_FOR_CSS_SIDES(side) {
PRUint32 hc1 = NS_SIDE_TO_HALF_CORNER(side, PR_FALSE, PR_TRUE);
PRUint32 hc2 = NS_SIDE_TO_HALF_CORNER(side, PR_TRUE, PR_TRUE);
gfxFloat length = NS_SIDE_IS_VERTICAL(side) ? maxHeight : maxWidth;
gfxFloat sum = radii[hc1] + radii[hc2];
// avoid floating point division in the normal case
if (length < sum)
f = NS_MIN(f, length/sum);
}
if (f < 1.0) {
NS_FOR_CSS_HALF_CORNERS(corner) {
radii[corner] *= f;
}
}
(*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,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aStyleContext,
PRIntn aSkipSides)
{
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);
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);
}
void
nsCSSRendering::PaintBorderWithStyleBorder(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
nsStyleContext* aStyleContext,
PRIntn 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 ? PR_TRUE : PR_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;
}
GetBorderRadiusTwips(aStyleBorder.mBorderRadius, aForFrame->GetSize().width,
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(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, outerRect, aSkipSides, twipsPerPixel,
&borderRadii);
PRUint8 borderStyles[4];
nscolor borderColors[4];
nsBorderColors *compositeColors[4];
// pull out styles, colors, composite colors
NS_FOR_CSS_SIDES (i) {
PRBool 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;
return aFrame->GetOverflowRect();
}
void
nsCSSRendering::PaintOutline(nsPresContext* aPresContext,
nsIRenderingContext& 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, PR_FALSE);
nsStyleContext* bgContext = bgFrame->GetStyleContext();
nscolor bgColor =
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
// get the radius for our outline
GetBorderRadiusTwips(ourOutline->mOutlineRadius, aBorderArea.width,
twipsRadii);
// 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->GetFirstChild(nsnull);
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 our conversion values
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
// get the outer rectangles
gfxRect oRect(RectToGfxRect(outerRect, twipsPerPixel));
// convert the radii
nsMargin outlineMargin(width, width, width, width);
gfxCornerSizes outlineRadii;
ComputePixelRadii(twipsRadii, outerRect, 0, twipsPerPixel,
&outlineRadii);
PRUint8 outlineStyle = ourOutline->GetOutlineStyle();
PRUint8 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,
nsnull, 0,
bgColor);
br.DrawBorders();
ctx->Restore();
SN();
}
void
nsCSSRendering::PaintFocus(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aFocusRect,
nscolor aColor)
{
nscoord oneCSSPixel = nsPresContext::CSSPixelsToAppUnits(1);
nscoord oneDevPixel = aPresContext->DevPixelsToAppUnits(1);
gfxRect focusRect(RectToGfxRect(aFocusRect, oneDevPixel));
gfxCornerSizes focusRadii;
{
nscoord twipsRadii[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
ComputePixelRadii(twipsRadii, aFocusRect, 0, oneDevPixel, &focusRadii);
}
gfxFloat focusWidths[4] = { gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel),
gfxFloat(oneCSSPixel / oneDevPixel) };
PRUint8 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,
nsnull, 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)
{
if (!aLayer.mPosition.mXIsPercent) {
aTopLeft->x = aAnchorPoint->x = aLayer.mPosition.mXPosition.mCoord;
}
else {
double percent = aLayer.mPosition.mXPosition.mFloat;
aAnchorPoint->x = NSToCoordRound(percent*aOriginBounds.width);
aTopLeft->x = NSToCoordRound(percent*(aOriginBounds.width - aImageSize.width));
}
if (!aLayer.mPosition.mYIsPercent) {
aTopLeft->y = aAnchorPoint->y = aLayer.mPosition.mYPosition.mCoord;
}
else {
double percent = aLayer.mPosition.mYPosition.mFloat;
aAnchorPoint->y = NSToCoordRound(percent*aOriginBounds.height);
aTopLeft->y = NSToCoordRound(percent*(aOriginBounds.height - aImageSize.height));
}
}
nsIFrame*
nsCSSRendering::FindNonTransparentBackgroundFrame(nsIFrame* aFrame,
PRBool aStartAtParent /*= PR_FALSE*/)
{
NS_ASSERTION(aFrame, "Cannot find NonTransparentBackgroundFrame in a null frame");
nsIFrame* frame = nsnull;
if (aStartAtParent) {
frame = nsLayoutUtils::GetParentOrPlaceholderFor(
aFrame->PresContext()->FrameManager(), 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->PresContext()->FrameManager(), 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.
PRBool
nsCSSRendering::IsCanvasFrame(nsIFrame* aFrame)
{
nsIAtom* frameType = aFrame->GetType();
return frameType == nsGkAtoms::canvasFrame ||
frameType == nsGkAtoms::rootFrame ||
frameType == nsGkAtoms::pageFrame ||
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()) {
nsIContent* content = aForFrame->GetContent();
// The root element content can't be null. We wouldn't know what
// frame to create for aFrame.
// Use |GetOwnerDoc| so it works during destruction.
if (content) {
nsIDocument* document = content->GetOwnerDoc();
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(document);
if (htmlDoc) {
nsIContent* bodyContent = htmlDoc->GetBodyContentExternal();
// 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 |InitialReflow| on the pres shell. See bug 119351
// for the ugly details.
if (bodyContent) {
nsIFrame *bodyFrame = bodyContent->GetPrimaryFrame();
if (bodyFrame) {
return nsLayoutUtils::GetStyleFrame(bodyFrame);
}
}
}
}
}
return aForFrame;
}
/**
* |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 PRBool
FindElementBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame,
nsStyleContext** aBackgroundSC)
{
if (aForFrame == aRootElementFrame) {
// We must have propagated our background to the viewport or canvas. Abort.
return PR_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 PR_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 PR_TRUE; // A pseudo-element frame.
// We should only look at the <html> background if we're in an HTML document
nsIDocument* document = content->GetOwnerDoc();
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(document);
if (!htmlDoc)
return PR_TRUE;
nsIContent* bodyContent = htmlDoc->GetBodyContentExternal();
if (bodyContent != content)
return PR_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 PR_TRUE;
const nsStyleBackground* htmlBG = aRootElementFrame->GetStyleBackground();
return !htmlBG->IsTransparent();
}
PRBool
nsCSSRendering::FindBackground(nsPresContext* aPresContext,
nsIFrame* aForFrame,
nsStyleContext** aBackgroundSC)
{
nsIFrame* rootElementFrame =
aPresContext->PresShell()->FrameConstructor()->GetRootElementStyleFrame();
if (IsCanvasFrame(aForFrame)) {
*aBackgroundSC = FindCanvasBackground(aForFrame, rootElementFrame);
return PR_TRUE;
} else {
return FindElementBackground(aForFrame, rootElementFrame, aBackgroundSC);
}
}
void
nsCSSRendering::DidPaint()
{
gInlineBGData->Reset();
}
PRBool
nsCSSRendering::GetBorderRadiusTwips(const nsStyleCorners& aBorderRadius,
const nscoord& aFrameWidth,
nscoord aRadii[8])
{
PRBool result = PR_FALSE;
// Convert percentage values
NS_FOR_CSS_HALF_CORNERS(i) {
const nsStyleCoord c = aBorderRadius.Get(i);
switch (c.GetUnit()) {
case eStyleUnit_Percent:
aRadii[i] = (nscoord)(c.GetPercentValue() * aFrameWidth);
break;
case eStyleUnit_Coord:
aRadii[i] = c.GetCoordValue();
break;
default:
NS_NOTREACHED("GetBorderRadiusTwips: bad unit");
aRadii[i] = 0;
break;
}
if (aRadii[i])
result = PR_TRUE;
}
return result;
}
void
nsCSSRendering::PaintBoxShadowOuter(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea,
const nsRect& aDirtyRect)
{
nsCSSShadowArray* shadows = aForFrame->GetEffectiveBoxShadows();
if (!shadows)
return;
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
PRIntn sidesToSkip = aForFrame->GetSkipSides();
// Get any border radius, since box-shadow must also have rounded corners if the frame does
nscoord twipsRadii[8];
PRBool hasBorderRadius = GetBorderRadiusTwips(styleBorder->mBorderRadius,
aFrameArea.width, twipsRadii);
nscoord twipsPerPixel = aPresContext->DevPixelsToAppUnits(1);
gfxCornerSizes borderRadii;
ComputePixelRadii(twipsRadii, aFrameArea, sidesToSkip,
twipsPerPixel, &borderRadii);
gfxRect frameGfxRect = RectToGfxRect(aFrameArea, 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;
if (hasBorderRadius) {
skipGfxRect.Inset(PR_MAX(borderRadii[C_TL].height, borderRadii[C_TR].height), 0,
PR_MAX(borderRadii[C_BL].height, borderRadii[C_BR].height), 0);
}
for (PRUint32 i = shadows->Length(); i > 0; --i) {
nsCSSShadowItem* shadowItem = shadows->ShadowAt(i - 1);
if (shadowItem->mInset)
continue;
nsRect shadowRect = aFrameArea;
shadowRect.MoveBy(shadowItem->mXOffset, shadowItem->mYOffset);
shadowRect.Inflate(shadowItem->mSpread, shadowItem->mSpread);
// 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(blurRadius, blurRadius);
gfxRect shadowGfxRect = RectToGfxRect(shadowRect, twipsPerPixel);
gfxRect shadowGfxRectPlusBlur = RectToGfxRect(shadowRectPlusBlur, twipsPerPixel);
shadowGfxRect.Round();
shadowGfxRectPlusBlur.RoundOut();
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsRefPtr<gfxContext> shadowContext;
nsContextBoxBlur blurringArea;
shadowContext = blurringArea.Init(shadowRect, blurRadius, twipsPerPixel, renderContext,
aDirtyRect, &skipGfxRect);
if (!shadowContext)
continue;
// 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 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();
// 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.
shadowContext->NewPath();
if (hasBorderRadius) {
gfxCornerSizes clipRectRadii;
gfxFloat spreadDistance = -shadowItem->mSpread / twipsPerPixel;
gfxFloat borderSizes[4] = {0, 0, 0, 0};
// We only give the spread radius to corners with a radius on them, otherwise we'll
// give a rounded shadow corner to a frame corner with 0 border radius, should
// the author use non-uniform border radii sizes (-moz-border-radius-topleft etc)
// (bug 514670)
if (borderRadii[C_TL].width > 0 || borderRadii[C_BL].width > 0) {
borderSizes[NS_SIDE_LEFT] = spreadDistance;
}
if (borderRadii[C_TL].height > 0 || borderRadii[C_TR].height > 0) {
borderSizes[NS_SIDE_TOP] = spreadDistance;
}
if (borderRadii[C_TR].width > 0 || borderRadii[C_BR].width > 0) {
borderSizes[NS_SIDE_RIGHT] = spreadDistance;
}
if (borderRadii[C_BL].height > 0 || borderRadii[C_BR].height > 0) {
borderSizes[NS_SIDE_BOTTOM] = spreadDistance;
}
nsCSSBorderRenderer::ComputeInnerRadii(borderRadii, borderSizes,
&clipRectRadii);
shadowContext->RoundedRectangle(shadowGfxRect, clipRectRadii);
} else {
shadowContext->Rectangle(shadowGfxRect);
}
shadowContext->Fill();
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBoxShadowInner(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea,
const nsRect& aDirtyRect)
{
nsCSSShadowArray* shadows = aForFrame->GetEffectiveBoxShadows();
if (!shadows)
return;
const nsStyleBorder* styleBorder = aForFrame->GetStyleBorder();
// Get any border radius, since box-shadow must also have rounded corners if the frame does
nscoord twipsRadii[8];
PRBool hasBorderRadius = GetBorderRadiusTwips(styleBorder->mBorderRadius,
aFrameArea.width, 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;
PRIntn sidesToSkip = aForFrame->GetSkipSides();
ComputePixelRadii(twipsRadii, aFrameArea, sidesToSkip,
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 (PRUint32 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;
nsRect shadowPaintRect = paddingRect;
shadowPaintRect.Inflate(blurRadius, blurRadius);
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. We also use this for clipping later on.
nsRect skipRect = shadowClipRect;
skipRect.Deflate(blurRadius, blurRadius);
gfxRect skipGfxRect = RectToGfxRect(skipRect, twipsPerPixel);
if (hasBorderRadius) {
skipGfxRect.Inset(PR_MAX(clipRectRadii[C_TL].height, clipRectRadii[C_TR].height), 0,
PR_MAX(clipRectRadii[C_BL].height, clipRectRadii[C_BR].height), 0);
}
gfxContext* renderContext = aRenderingContext.ThebesContext();
nsRefPtr<gfxContext> shadowContext;
nsContextBoxBlur blurringArea;
shadowContext = blurringArea.Init(shadowPaintRect, blurRadius, twipsPerPixel, renderContext,
aDirtyRect, &skipGfxRect);
if (!shadowContext)
continue;
// 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 = RectToGfxRect(paddingRect, twipsPerPixel);
shadowGfxRect.Round();
renderContext->NewPath();
if (hasBorderRadius)
renderContext->RoundedRectangle(shadowGfxRect, innerRadii, PR_FALSE);
else
renderContext->Rectangle(shadowGfxRect);
renderContext->Rectangle(skipGfxRect);
renderContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
renderContext->Clip();
// Fill the temporary surface minus the area within the frame that we should
// not paint in, and blur and apply it
gfxRect shadowPaintGfxRect = RectToGfxRect(shadowPaintRect, twipsPerPixel);
shadowPaintGfxRect.RoundOut();
gfxRect shadowClipGfxRect = RectToGfxRect(shadowClipRect, twipsPerPixel);
shadowClipGfxRect.Round();
shadowContext->NewPath();
shadowContext->Rectangle(shadowPaintGfxRect);
if (hasBorderRadius)
shadowContext->RoundedRectangle(shadowClipGfxRect, clipRectRadii, PR_FALSE);
else
shadowContext->Rectangle(shadowClipGfxRect);
shadowContext->SetFillRule(gfxContext::FILL_RULE_EVEN_ODD);
shadowContext->Fill();
blurringArea.DoPaint();
renderContext->Restore();
}
}
void
nsCSSRendering::PaintBackground(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
PRUint32 aFlags,
nsRect* aBGClipRect)
{
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);
}
static PRBool
IsOpaqueBorderEdge(const nsStyleBorder& aBorder, mozilla::css::Side aSide)
{
if (aBorder.GetActualBorder().side(aSide) == 0)
return PR_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 PR_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 PR_FALSE;
nscolor color;
PRBool 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 PR_FALSE;
return NS_GET_A(color) == 255;
}
/**
* Returns true if all border edges are either missing or opaque.
*/
static PRBool
IsOpaqueBorder(const nsStyleBorder& aBorder)
{
if (aBorder.mBorderColors)
return PR_FALSE;
NS_FOR_CSS_SIDES(i) {
if (!IsOpaqueBorderEdge(aBorder, i))
return PR_FALSE;
}
return PR_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 = 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");
}
static void
SetupBackgroundClip(gfxContext *aCtx, PRUint8 aBackgroundClip,
nsIFrame* aForFrame, const nsRect& aBorderArea,
const nsRect& aCallerDirtyRect, PRBool aHaveRoundedCorners,
const gfxCornerSizes& aBGRadii, nscoord aAppUnitsPerPixel,
gfxContextAutoSaveRestore* aAutoSR,
/* OUT: */
nsRect* aBGClipArea, nsRect* aDirtyRect,
gfxRect* aDirtyRectGfx)
{
*aBGClipArea = aBorderArea;
PRBool radiiAreOuter = PR_TRUE;
gfxCornerSizes clippedRadii = aBGRadii;
if (aBackgroundClip != NS_STYLE_BG_CLIP_BORDER) {
NS_ASSERTION(aBackgroundClip == NS_STYLE_BG_CLIP_PADDING,
"unexpected background-clip");
nsMargin border = aForFrame->GetUsedBorder();
aForFrame->ApplySkipSides(border);
aBGClipArea->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,
&clippedRadii);
radiiAreOuter = PR_FALSE;
}
}
SetupDirtyRects(*aBGClipArea, aCallerDirtyRect, aAppUnitsPerPixel,
aDirtyRect, aDirtyRectGfx);
if (aDirtyRectGfx->IsEmpty()) {
// Our caller won't draw anything under this condition, so no need
// to set more up.
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(RectToGfxRect(*aBGClipArea, 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.
aDirtyRectGfx->size.SizeTo(0.0, 0.0);
return;
}
aAutoSR->Reset(aCtx);
aCtx->NewPath();
aCtx->RoundedRectangle(bgAreaGfx, clippedRadii, radiiAreOuter);
aCtx->Clip();
}
}
static nscolor
DetermineBackgroundColorInternal(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsIFrame* aFrame,
PRBool& aDrawBackgroundImage,
PRBool& aDrawBackgroundColor)
{
aDrawBackgroundImage = PR_TRUE;
aDrawBackgroundColor = PR_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 = PR_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 = PR_TRUE;
else
bgColor = NS_RGBA(0,0,0,0);
}
return bgColor;
}
nscolor
nsCSSRendering::DetermineBackgroundColor(nsPresContext* aPresContext,
nsStyleContext* aStyleContext,
nsIFrame* aFrame)
{
PRBool drawBackgroundImage;
PRBool drawBackgroundColor;
return DetermineBackgroundColorInternal(aPresContext,
aStyleContext,
aFrame,
drawBackgroundImage,
drawBackgroundColor);
}
static gfxFloat
ConvertGradientValueToPixels(const nsStyleCoord& aCoord,
gfxFloat aFillLength,
PRInt32 aAppUnitsPerPixel)
{
switch (aCoord.GetUnit()) {
case eStyleUnit_Percent:
return aCoord.GetPercentValue() * aFillLength;
case eStyleUnit_Coord:
return NSAppUnitsToFloatPixels(aCoord.GetCoordValue(), 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();
} 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 {
PRInt32 appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
*aLineStart = gfxPoint(
ConvertGradientValueToPixels(aGradient->mBgPosX, aBoxSize.width,
appUnitsPerPixel),
ConvertGradientValueToPixels(aGradient->mBgPosY, aBoxSize.height,
appUnitsPerPixel));
if (aGradient->mAngle.IsAngleValue()) {
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 {
PRInt32 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 = PR_ABS(aLineStart->x);
double rightDistance = PR_ABS(aBoxSize.width - aLineStart->x);
double topDistance = PR_ABS(aLineStart->y);
double bottomDistance = PR_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;
}
default:
NS_ABORT_IF_FALSE(PR_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 = NS_floor(double(aDirtyCoord - aTilePos)/aTileDim);
return NSToCoordRound(multiples*aTileDim + aTilePos);
}
void
nsCSSRendering::PaintGradient(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsStyleGradient* aGradient,
const nsRect& aDirtyRect,
const nsRect& aOneCellArea,
const nsRect& aFillArea)
{
if (aOneCellArea.IsEmpty())
return;
gfxContext *ctx = aRenderingContext.ThebesContext();
nscoord appUnitsPerPixel = aPresContext->AppUnitsPerDevPixel();
gfxRect oneCellArea = RectToGfxRect(aOneCellArea, appUnitsPerPixel);
// 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.
PRInt32 firstUnsetPosition = -1;
for (PRUint32 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;
default:
NS_ABORT_IF_FALSE(PR_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 (PRUint32 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 = NS_ceil(-firstStop/stopDelta);
// Advance stops by instanceCount multiples of the period of the
// repeating gradient.
double offset = instanceCount*stopDelta;
for (PRUint32 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 (PRUint32 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;
if (stopDelta < 1e-6 || lineLength < 1e-6 ||
(aGradient->mShape != NS_STYLE_GRADIENT_SHAPE_LINEAR &&
(radiusX < 1e-6 || radiusY < 1e-6))) {
// Stops are all at the same place. Map all stops to 0.0.
// For radial gradients we need to fill with the last stop color,
// so just set both radii to 0.
stopScale = 0.0;
radiusX = radiusY = 0.0;
lastStop = firstStop;
} else {
stopScale = 1.0/stopDelta;
}
// Create the gradient pattern.
nsRefPtr<gfxPattern> gradientPattern;
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);
} 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;
gradientPattern = new gfxPattern(lineStart.x, lineStart.y, innerRadius,
lineStart.x, lineStart.y, outerRadius);
if (gradientPattern && 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 || gradientPattern->CairoStatus())
return;
// Now set normalized color stops in pattern.
if (stopScale == 0.0) {
// Non-repeating linear gradient with all stops in same place -> just add
// first stop and last stop, both at position 0.
// Repeating or radial gradient with all stops in the same place -> just
// paint the last stop color.
if (!aGradient->mRepeating &&
aGradient->mShape == NS_STYLE_GRADIENT_SHAPE_LINEAR) {
gradientPattern->AddColorStop(0.0, stops[0].mColor);
}
gradientPattern->AddColorStop(0.0, stops[stops.Length() - 1].mColor);
} else {
// Use all stops
for (PRUint32 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) {
gradientPattern->SetExtend(gfxPattern::EXTEND_REPEAT);
}
// 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 = RectToGfxRect(aFillArea, appUnitsPerPixel);
gfxMatrix ctm = ctx->CurrentMatrix();
// 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 = dirty.XMost();
nscoord yEnd = 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 =
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 = tileRect.Intersect(areaToFill);
ctx->NewPath();
ctx->Translate(tileRect.pos);
ctx->SetPattern(gradientPattern);
ctx->Rectangle(fillRect - tileRect.pos, PR_TRUE);
ctx->Fill();
ctx->SetMatrix(ctm);
}
}
}
void
nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsStyleContext* aBackgroundSC,
const nsStyleBorder& aBorder,
PRUint32 aFlags,
nsRect* aBGClipRect)
{
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 dirty;
dirty.IntersectRect(aDirtyRect, aBorderArea);
theme->DrawWidgetBackground(&aRenderingContext, aForFrame,
displayData->mAppearance, aBorderArea, dirty);
return;
}
}
// For canvas frames (in the CSS sense) we draw the background color using
// a solid color item that gets added in nsLayoutUtils::PaintFrame,
// PresShell::RenderDocument, or nsSubDocumentFrame::BuildDisplayList
// (bug 488242).
PRBool isCanvasFrame = IsCanvasFrame(aForFrame);
// Determine whether we are drawing background images and/or
// background colors.
PRBool drawBackgroundImage;
PRBool drawBackgroundColor;
nscolor bgColor = DetermineBackgroundColorInternal(aPresContext,
aBackgroundSC,
aForFrame,
drawBackgroundImage,
drawBackgroundColor);
// 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;
PRBool haveRoundedCorners;
{
nscoord radii[8];
haveRoundedCorners =
GetBorderRadiusTwips(aBorder.mBorderRadius, aForFrame->GetSize().width,
radii);
if (haveRoundedCorners)
ComputePixelRadii(radii, aBorderArea, aForFrame->GetSkipSides(),
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].)
const nsStyleBackground *bg = aBackgroundSC->GetStyleBackground();
nsRect bgClipArea, dirtyRect;
gfxRect dirtyRectGfx;
PRUint8 currentBackgroundClip;
PRBool isSolidBorder;
gfxContextAutoSaveRestore autoSR;
if (aBGClipRect) {
bgClipArea = *aBGClipRect;
SetupDirtyRects(bgClipArea, aDirtyRect, appUnitsPerPixel,
&dirtyRect, &dirtyRectGfx);
} 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_PADDING;
SetupBackgroundClip(ctx, currentBackgroundClip, aForFrame,
aBorderArea, aDirtyRect, haveRoundedCorners,
bgRadii, appUnitsPerPixel, &autoSR,
&bgClipArea, &dirtyRect, &dirtyRectGfx);
}
// If we might be using a background color, go ahead and set it now.
if (drawBackgroundColor && !isCanvasFrame)
ctx->SetColor(gfxRGBA(bgColor));
// 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 (!dirtyRectGfx.IsEmpty() && !isCanvasFrame) {
ctx->NewPath();
ctx->Rectangle(dirtyRectGfx, PR_TRUE);
ctx->Fill();
}
return;
}
// 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.
aPresContext->SetupBackgroundImageLoaders(aForFrame, bg);
// We can skip painting the background color if a background image is opaque.
if (drawBackgroundColor &&
bg->BottomLayer().mRepeat == NS_STYLE_BG_REPEAT_XY &&
bg->BottomLayer().mImage.IsOpaque())
drawBackgroundColor = PR_FALSE;
// The background color is rendered over the entire dirty area,
// even if the image isn't.
if (drawBackgroundColor && !isCanvasFrame) {
if (!dirtyRectGfx.IsEmpty()) {
ctx->NewPath();
ctx->Rectangle(dirtyRectGfx, PR_TRUE);
ctx->Fill();
}
}
if (drawBackgroundImage) {
NS_FOR_VISIBLE_BACKGROUND_LAYERS_BACK_TO_FRONT(i, bg) {
const nsStyleBackground::Layer &layer = bg->mLayers[i];
if (!aBGClipRect) {
PRUint8 newBackgroundClip =
isSolidBorder ? NS_STYLE_BG_CLIP_PADDING : layer.mClip;
if (currentBackgroundClip != newBackgroundClip) {
currentBackgroundClip = newBackgroundClip;
SetupBackgroundClip(ctx, currentBackgroundClip, aForFrame,
aBorderArea, aDirtyRect, haveRoundedCorners,
bgRadii, appUnitsPerPixel, &autoSR,
&bgClipArea, &dirtyRect, &dirtyRectGfx);
}
}
if (!dirtyRectGfx.IsEmpty()) {
PaintBackgroundLayer(aPresContext, aRenderingContext, aForFrame, aFlags,
dirtyRect, aBorderArea, bgClipArea, *bg,
layer);
}
}
}
}
static inline float
ScaleDimension(nsStyleBackground::Size::Dimension aDimension,
PRUint8 aType,
nscoord aLength, nscoord aAvailLength)
{
switch (aType) {
case nsStyleBackground::Size::ePercentage:
return double(aDimension.mFloat) * (double(aAvailLength) / double(aLength));
case nsStyleBackground::Size::eLength:
return double(aDimension.mCoord) / double(aLength);
default:
NS_ABORT_IF_FALSE(PR_FALSE, "bad aDimension.mType");
return 1.0f;
case nsStyleBackground::Size::eAuto:
NS_ABORT_IF_FALSE(PR_FALSE, "aDimension.mType == eAuto isn't handled");
return 1.0f;
}
}
static void
PaintBackgroundLayer(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
PRUint32 aFlags,
const nsRect& aDirtyRect, // intersected with aBGClipRect
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 (-moz-background-clip)
* background-origin (-moz-background-origin)
* background-size (-moz-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
*/
PRUint32 irFlags = 0;
if (aFlags & nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES)
irFlags |= ImageRenderer::FLAG_SYNC_DECODE_IMAGES;
ImageRenderer imageRenderer(aForFrame, aLayer.mImage, irFlags);
if (!imageRenderer.PrepareImage()) {
// There's no image or it's not ready to be painted.
return;
}
// 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 ||
frameType == nsGkAtoms::positionedInlineFrame) {
// 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->GetFirstChild(nsnull);
// 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();
geometryFrame->ApplySkipSides(border);
bgPositioningArea.Deflate(border);
if (aLayer.mOrigin != NS_STYLE_BG_ORIGIN_PADDING) {
nsMargin padding = geometryFrame->GetUsedPadding();
geometryFrame->ApplySkipSides(padding);
bgPositioningArea.Deflate(padding);
NS_ASSERTION(aLayer.mOrigin == NS_STYLE_BG_ORIGIN_CONTENT,
"unknown background-origin value");
}
}
// 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, anchor;
if (NS_STYLE_BG_ATTACHMENT_FIXED == aLayer.mAttachment) {
// 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 = nsnull;
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 (aRenderingContext.ThebesContext()->GetFlags() &
gfxContext::FLAG_DESTINED_FOR_SCREEN) {
// Clip background-attachment:fixed backgrounds to the viewport, if we're
// painting to the screen. 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());
}
}
nsSize imageSize = imageRenderer.ComputeSize(bgPositioningArea.Size());
if (imageSize.width <= 0 || imageSize.height <= 0)
return;
// Scale the image as specified for background-size and as required for
// proper background positioning when background-position is defined with
// percentages.
float scaleX, scaleY;
switch (aLayer.mSize.mWidthType) {
case nsStyleBackground::Size::eContain:
case nsStyleBackground::Size::eCover: {
float scaleFitX = double(bgPositioningArea.width) / imageSize.width;
float scaleFitY = double(bgPositioningArea.height) / imageSize.height;
if (aLayer.mSize.mWidthType == nsStyleBackground::Size::eCover) {
scaleX = scaleY = NS_MAX(scaleFitX, scaleFitY);
} else {
scaleX = scaleY = NS_MIN(scaleFitX, scaleFitY);
}
break;
}
default: {
if (aLayer.mSize.mWidthType == nsStyleBackground::Size::eAuto) {
if (aLayer.mSize.mHeightType == nsStyleBackground::Size::eAuto) {
scaleX = scaleY = 1.0f;
} else {
scaleX = scaleY =
ScaleDimension(aLayer.mSize.mHeight, aLayer.mSize.mHeightType,
imageSize.height, bgPositioningArea.height);
}
} else {
if (aLayer.mSize.mHeightType == nsStyleBackground::Size::eAuto) {
scaleX = scaleY =
ScaleDimension(aLayer.mSize.mWidth, aLayer.mSize.mWidthType,
imageSize.width, bgPositioningArea.width);
} else {
scaleX = ScaleDimension(aLayer.mSize.mWidth, aLayer.mSize.mWidthType,
imageSize.width, bgPositioningArea.width);
scaleY = ScaleDimension(aLayer.mSize.mHeight, aLayer.mSize.mHeightType,
imageSize.height, bgPositioningArea.height);
}
}
break;
}
}
imageSize.width = NSCoordSaturatingNonnegativeMultiply(imageSize.width, scaleX);
imageSize.height = NSCoordSaturatingNonnegativeMultiply(imageSize.height, scaleY);
// Compute the position of the background now that the background's size is
// determined.
ComputeBackgroundAnchorPoint(aLayer, bgPositioningArea.Size(), imageSize,
&imageTopLeft, &anchor);
imageTopLeft += bgPositioningArea.TopLeft();
anchor += bgPositioningArea.TopLeft();
nsRect destArea(imageTopLeft + aBorderArea.TopLeft(), imageSize);
nsRect fillArea = destArea;
PRIntn repeat = aLayer.mRepeat;
PR_STATIC_ASSERT(NS_STYLE_BG_REPEAT_XY ==
(NS_STYLE_BG_REPEAT_X | NS_STYLE_BG_REPEAT_Y));
if (repeat & NS_STYLE_BG_REPEAT_X) {
fillArea.x = bgClipRect.x;
fillArea.width = bgClipRect.width;
}
if (repeat & NS_STYLE_BG_REPEAT_Y) {
fillArea.y = bgClipRect.y;
fillArea.height = bgClipRect.height;
}
fillArea.IntersectRect(fillArea, bgClipRect);
imageRenderer.Draw(aPresContext, aRenderingContext, destArea, fillArea,
anchor + aBorderArea.TopLeft(), aDirtyRect);
}
static void
DrawBorderImage(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsStyleBorder& aStyleBorder,
const nsRect& aDirtyRect)
{
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.
aPresContext->SetupBorderImageLoaders(aForFrame, &aStyleBorder);
imgIRequest *req = aStyleBorder.GetBorderImage();
#ifdef DEBUG
{
PRUint32 status = imgIRequest::STATUS_ERROR;
if (req)
req->GetImageStatus(&status);
NS_ASSERTION(req && (status & imgIRequest::STATUS_LOAD_COMPLETE),
"no image to draw");
}
#endif
// Get the actual image, and determine where the split points are.
// Note that mBorderImageSplit is in image pixels, not necessarily
// CSS pixels.
nsCOMPtr<imgIContainer> imgContainer;
req->GetImage(getter_AddRefs(imgContainer));
nsIntSize imageSize;
imgContainer->GetWidth(&imageSize.width);
imgContainer->GetHeight(&imageSize.height);
// Convert percentages and clamp values to the image size.
nsIntMargin split;
NS_FOR_CSS_SIDES(s) {
nsStyleCoord coord = aStyleBorder.mBorderImageSplit.Get(s);
PRInt32 imgDimension = ((s == NS_SIDE_TOP || s == NS_SIDE_BOTTOM)
? imageSize.height
: imageSize.width);
double value;
switch (coord.GetUnit()) {
case eStyleUnit_Percent:
value = coord.GetPercentValue() * imgDimension;
break;
case eStyleUnit_Factor:
value = coord.GetFactorValue();
break;
default:
NS_ASSERTION(coord.GetUnit() == eStyleUnit_Null,
"unexpected CSS unit for image split");
value = 0;
break;
}
if (value < 0)
value = 0;
if (value > imgDimension)
value = imgDimension;
split.side(s) = NS_lround(value);
}
nsMargin border(aStyleBorder.GetActualBorder());
// These helper tables recharacterize the 'split' and 'border' 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 image (for 'split') or the page (for 'border').
enum {
LEFT, MIDDLE, RIGHT,
TOP = LEFT, BOTTOM = RIGHT
};
const nscoord borderX[3] = {
aBorderArea.x + 0,
aBorderArea.x + border.left,
aBorderArea.x + aBorderArea.width - border.right,
};
const nscoord borderY[3] = {
aBorderArea.y + 0,
aBorderArea.y + border.top,
aBorderArea.y + aBorderArea.height - border.bottom,
};
const nscoord borderWidth[3] = {
border.left,
aBorderArea.width - border.left - border.right,
border.right,
};
const nscoord borderHeight[3] = {
border.top,
aBorderArea.height - border.top - border.bottom,
border.bottom,
};
const PRInt32 splitX[3] = {
0,
split.left,
imageSize.width - split.right,
};
const PRInt32 splitY[3] = {
0,
split.top,
imageSize.height - split.bottom,
};
const PRInt32 splitWidth[3] = {
split.left,
imageSize.width - split.left - split.right,
split.right,
};
const PRInt32 splitHeight[3] = {
split.top,
imageSize.height - split.top - split.bottom,
split.bottom,
};
// In all the 'factor' calculations below, 'border' measurements are
// in app units but 'split' 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(splitX[i], splitY[j], splitWidth[i], splitHeight[j]);
PRUint8 fillStyleH, fillStyleV;
nsSize unitSize;
if (i == MIDDLE && j == MIDDLE) {
// 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 < split.left)
vFactor = gfxFloat(border.left)/split.left;
else if (0 < border.right && 0 < split.right)
vFactor = gfxFloat(border.right)/split.right;
else
vFactor = nsPresContext::CSSPixelsToAppUnits(1);
if (0 < border.top && 0 < split.top)
hFactor = gfxFloat(border.top)/split.top;
else if (0 < border.bottom && 0 < split.bottom)
hFactor = gfxFloat(border.bottom)/split.bottom;
else
hFactor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = splitWidth[i]*hFactor;
unitSize.height = splitHeight[j]*vFactor;
fillStyleH = aStyleBorder.mBorderImageHFill;
fillStyleV = aStyleBorder.mBorderImageVFill;
} 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 < splitHeight[j])
factor = gfxFloat(borderHeight[j])/splitHeight[j];
else
factor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = splitWidth[i]*factor;
unitSize.height = borderHeight[j];
fillStyleH = aStyleBorder.mBorderImageHFill;
fillStyleV = NS_STYLE_BORDER_IMAGE_STRETCH;
} else if (j == MIDDLE) { // left, right
gfxFloat factor;
if (0 < borderWidth[i] && 0 < splitWidth[i])
factor = gfxFloat(borderWidth[i])/splitWidth[i];
else
factor = nsPresContext::CSSPixelsToAppUnits(1);
unitSize.width = borderWidth[i];
unitSize.height = splitHeight[j]*factor;
fillStyleH = NS_STYLE_BORDER_IMAGE_STRETCH;
fillStyleV = aStyleBorder.mBorderImageVFill;
} else {
// Corners are always stretched to fit the corner.
unitSize.width = borderWidth[i];
unitSize.height = borderHeight[j];
fillStyleH = NS_STYLE_BORDER_IMAGE_STRETCH;
fillStyleV = NS_STYLE_BORDER_IMAGE_STRETCH;
}
DrawBorderImageComponent(aRenderingContext, aForFrame,
imgContainer, aDirtyRect,
destArea, subArea,
fillStyleH, fillStyleV,
unitSize, aStyleBorder, i * (RIGHT + 1) + j);
}
}
}
static void
DrawBorderImageComponent(nsIRenderingContext& aRenderingContext,
nsIFrame* aForFrame,
imgIContainer* aImage,
const nsRect& aDirtyRect,
const nsRect& aFill,
const nsIntRect& aSrc,
PRUint8 aHFill,
PRUint8 aVFill,
const nsSize& aUnitSize,
const nsStyleBorder& aStyleBorder,
PRUint8 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 PR_TRUE
PRBool animated = PR_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_STRETCH &&
aVFill == NS_STYLE_BORDER_IMAGE_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_STRETCH:
tile.x = aFill.x;
tile.width = aFill.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT:
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
tile.width = aUnitSize.width;
break;
case NS_STYLE_BORDER_IMAGE_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_STRETCH:
tile.y = aFill.y;
tile.height = aFill.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT:
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
tile.height = aUnitSize.height;
break;
case NS_STYLE_BORDER_IMAGE_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,
PRBool aRoundDown = PR_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,
PRBool aRoundDown = PR_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(nsIRenderingContext& aContext,
nsRect aRect,
nscoord aTwipsPerPixel,
PRUint8 aStartBevelSide = 0,
nscoord aStartBevelOffset = 0,
PRUint8 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.x, aRect.y, aRect.x, aRect.y + aRect.height);
else
aContext.FillRect(aRect);
}
else {
if (1 == aRect.width)
aContext.DrawLine(aRect.x, aRect.y, aRect.x + aRect.width, aRect.y);
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,
PRInt32& 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(nsIRenderingContext& aContext,
PRUint8 aBorderStyle,
nscolor aBorderColor,
const nsStyleBackground* aBGColor,
const nsRect& aBorder,
PRInt32 aAppUnitsPerCSSPixel,
PRUint8 aStartBevelSide,
nscoord aStartBevelOffset,
PRUint8 aEndBevelSide,
nscoord aEndBevelOffset)
{
aContext.SetColor (aBorderColor);
PRBool horizontal = ((NS_SIDE_TOP == aStartBevelSide) || (NS_SIDE_BOTTOM == aStartBevelSide));
nscoord twipsPerPixel = NSIntPixelsToAppUnits(1, aAppUnitsPerCSSPixel);
PRUint8 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(PR_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 (PRInt32 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 (PRInt32 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, PR_TRUE) : 0;
nscoord endBevel = (aEndBevelOffset > 0)
? RoundFloatToPixel(0.5f * (float)aEndBevelOffset, twipsPerPixel, PR_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:
if ((aBorder.width > 2) && (aBorder.height > 2)) {
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(PR_FALSE, "inset, outset should have been converted to groove, ridge");
break;
case NS_STYLE_BORDER_STYLE_AUTO:
NS_ASSERTION(PR_FALSE, "Unexpected 'auto' table border");
break;
}
ctx->SetAntialiasMode(oldMode);
}
// End table border-collapsing section
void
nsCSSRendering::PaintDecorationLine(gfxContext* aGfxContext,
const nscolor aColor,
const gfxPoint& aPt,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle != DECORATION_STYLE_NONE, "aStyle is none");
gfxRect rect =
GetTextDecorationRectInternal(aPt, aLineSize, aAscent, aOffset,
aDecoration, aStyle, aDescentLimit);
if (rect.IsEmpty())
return;
if (aDecoration != NS_STYLE_TEXT_DECORATION_UNDERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_OVERLINE &&
aDecoration != NS_STYLE_TEXT_DECORATION_LINE_THROUGH)
{
NS_ERROR("Invalid decoration value!");
return;
}
gfxFloat lineHeight = NS_MAX(NS_round(aLineSize.height), 1.0);
PRBool contextIsSaved = PR_FALSE;
gfxFloat oldLineWidth;
nsRefPtr<gfxPattern> oldPattern;
switch (aStyle) {
case DECORATION_STYLE_SOLID:
case DECORATION_STYLE_DOUBLE:
oldLineWidth = aGfxContext->CurrentLineWidth();
oldPattern = aGfxContext->GetPattern();
break;
case DECORATION_STYLE_DASHED: {
aGfxContext->Save();
contextIsSaved = PR_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);
// We should continue to draw the last dash even if it is not in the rect.
rect.size.width += dashWidth;
break;
}
case DECORATION_STYLE_DOTTED: {
aGfxContext->Save();
contextIsSaved = PR_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);
// We should continue to draw the last dot even if it is not in the rect.
rect.size.width += dashWidth;
break;
}
case DECORATION_STYLE_WAVY:
aGfxContext->Save();
contextIsSaved = PR_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.pos.y += lineHeight / 2;
aGfxContext->SetColor(gfxRGBA(aColor));
aGfxContext->SetLineWidth(lineHeight);
switch (aStyle) {
case DECORATION_STYLE_SOLID:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case 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.size.height -= lineHeight;
aGfxContext->MoveTo(rect.BottomLeft());
aGfxContext->LineTo(rect.BottomRight());
aGfxContext->Stroke();
break;
case DECORATION_STYLE_DOTTED:
case DECORATION_STYLE_DASHED:
aGfxContext->NewPath();
aGfxContext->MoveTo(rect.TopLeft());
aGfxContext->LineTo(rect.TopRight());
aGfxContext->Stroke();
break;
case 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.
*/
rect.pos.x += lineHeight / 2.0;
aGfxContext->NewPath();
gfxPoint pt(rect.pos);
gfxFloat rightMost = pt.x + rect.Width() + lineHeight;
gfxFloat adv = rect.Height() - lineHeight;
gfxFloat flatLengthAtVertex = NS_MAX((lineHeight - 1.0) * 2.0, 1.0);
pt.x -= lineHeight;
aGfxContext->MoveTo(pt); // 1
pt.x = rect.pos.x;
aGfxContext->LineTo(pt); // 2
PRBool goDown = PR_TRUE;
while (pt.x < rightMost) {
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);
}
}
nsRect
nsCSSRendering::GetTextDecorationRect(nsPresContext* aPresContext,
const gfxSize& aLineSize,
const gfxFloat aAscent,
const gfxFloat aOffset,
const PRUint8 aDecoration,
const PRUint8 aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aPresContext, "aPresContext is null");
NS_ASSERTION(aStyle != 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 PRUint8 aDecoration,
const PRUint8 aStyle,
const gfxFloat aDescentLimit)
{
NS_ASSERTION(aStyle <= DECORATION_STYLE_WAVY, "Invalid aStyle value");
if (aStyle == DECORATION_STYLE_NONE)
return gfxRect(0, 0, 0, 0);
PRBool canLiftUnderline = aDescentLimit >= 0.0;
gfxRect r;
r.pos.x = NS_floor(aPt.x + 0.5);
r.size.width = NS_round(aLineSize.width);
gfxFloat lineHeight = NS_round(aLineSize.height);
lineHeight = NS_MAX(lineHeight, 1.0);
gfxFloat ascent = NS_round(aAscent);
gfxFloat descentLimit = NS_floor(aDescentLimit);
gfxFloat suggestedMaxRectHeight = NS_MAX(NS_MIN(ascent, descentLimit), 1.0);
r.size.height = lineHeight;
if (aStyle == 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.size.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.size.height = NS_MAX(suggestedMaxRectHeight, lineHeight * 2.0 + 1.0);
}
}
} else if (aStyle == 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.size.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.size.height = NS_MAX(suggestedMaxRectHeight, lineHeight * 2.0);
}
}
}
gfxFloat baseline = NS_floor(aPt.y + aAscent + 0.5);
gfxFloat offset = 0.0;
switch (aDecoration) {
case NS_STYLE_TEXT_DECORATION_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_OVERLINE:
offset = aOffset - lineHeight + r.Height();
break;
case NS_STYLE_TEXT_DECORATION_LINE_THROUGH: {
gfxFloat extra = NS_floor(r.Height() / 2.0 + 0.5);
extra = NS_MAX(extra, lineHeight);
offset = aOffset - lineHeight + extra;
break;
}
default:
NS_ERROR("Invalid decoration value!");
}
r.pos.y = baseline - NS_floor(offset + 0.5);
return r;
}
// ------------------
// ImageRenderer
// ------------------
ImageRenderer::ImageRenderer(nsIFrame* aForFrame,
const nsStyleImage& aImage,
PRUint32 aFlags)
: mForFrame(aForFrame)
, mImage(aImage)
, mType(aImage.GetType())
, mImageContainer(nsnull)
, mGradientData(nsnull)
, mIsReady(PR_FALSE)
, mSize(0, 0)
, mFlags(aFlags)
{
}
ImageRenderer::~ImageRenderer()
{
}
PRBool
ImageRenderer::PrepareImage()
{
if (mImage.IsEmpty() || !mImage.IsComplete()) {
// Make sure the image is actually decoding
mImage.RequestDecode();
// 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
nsCOMPtr<imgIContainer> img;
if (!((mFlags & FLAG_SYNC_DECODE_IMAGES) &&
(mType == eStyleImageType_Image) &&
(NS_SUCCEEDED(mImage.GetImageData()->GetImage(getter_AddRefs(img))) && img)))
return PR_FALSE;
}
switch (mType) {
case eStyleImageType_Image:
{
nsCOMPtr<imgIContainer> srcImage;
mImage.GetImageData()->GetImage(getter_AddRefs(srcImage));
NS_ABORT_IF_FALSE(srcImage, "If srcImage is null, mImage.IsComplete() "
"should have returned false");
if (!mImage.GetCropRect()) {
mImageContainer.swap(srcImage);
} else {
nsIntRect actualCropRect;
PRBool isEntireImage;
PRBool success =
mImage.ComputeActualCropRect(actualCropRect, &isEntireImage);
NS_ASSERTION(success, "ComputeActualCropRect() should not fail here");
if (!success || actualCropRect.IsEmpty()) {
// The cropped image has zero size
return PR_FALSE;
}
if (isEntireImage) {
// The cropped image is identical to the source image
mImageContainer.swap(srcImage);
} else {
nsCOMPtr<imgIContainer> subImage;
PRUint32 aExtractFlags = (mFlags & FLAG_SYNC_DECODE_IMAGES)
? (PRUint32) imgIContainer::FLAG_SYNC_DECODE
: (PRUint32) 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 PR_FALSE;
}
mImageContainer.swap(subImage);
}
}
mIsReady = PR_TRUE;
break;
}
case eStyleImageType_Gradient:
mGradientData = mImage.GetGradientData();
mIsReady = PR_TRUE;
break;
case eStyleImageType_Null:
default:
break;
}
return mIsReady;
}
nsSize
ImageRenderer::ComputeSize(const nsSize& aDefault)
{
NS_ASSERTION(mIsReady, "Ensure PrepareImage() has returned true "
"before calling me");
switch (mType) {
case eStyleImageType_Image:
{
nsIntSize imageIntSize;
mImageContainer->GetWidth(&imageIntSize.width);
mImageContainer->GetHeight(&imageIntSize.height);
mSize.width = nsPresContext::CSSPixelsToAppUnits(imageIntSize.width);
mSize.height = nsPresContext::CSSPixelsToAppUnits(imageIntSize.height);
break;
}
case eStyleImageType_Gradient:
mSize = aDefault;
break;
case eStyleImageType_Null:
default:
mSize.SizeTo(0, 0);
break;
}
return mSize;
}
void
ImageRenderer::Draw(nsPresContext* aPresContext,
nsIRenderingContext& 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())
return;
switch (mType) {
case eStyleImageType_Image:
{
PRUint32 drawFlags = (mFlags & FLAG_SYNC_DECODE_IMAGES)
? (PRUint32) imgIContainer::FLAG_SYNC_DECODE
: (PRUint32) imgIContainer::FLAG_NONE;
nsLayoutUtils::DrawImage(&aRenderingContext, mImageContainer,
nsLayoutUtils::GetGraphicsFilterForFrame(mForFrame),
aDest, aFill, aAnchor, aDirty, drawFlags);
break;
}
case eStyleImageType_Gradient:
nsCSSRendering::PaintGradient(aPresContext, aRenderingContext,
mGradientData, aDirty, aDest, aFill);
break;
case eStyleImageType_Null:
default:
break;
}
}
#define MAX_BLUR_RADIUS 300
// -----
// nsContextBoxBlur
// -----
gfxContext*
nsContextBoxBlur::Init(const nsRect& aRect, nscoord aBlurRadius,
PRInt32 aAppUnitsPerDevPixel,
gfxContext* aDestinationCtx,
const nsRect& aDirtyRect,
const gfxRect* aSkipRect)
{
if (aRect.IsEmpty()) {
mContext = nsnull;
return nsnull;
}
PRInt32 blurRadius = static_cast<PRInt32>(aBlurRadius / aAppUnitsPerDevPixel);
blurRadius = PR_MIN(blurRadius, MAX_BLUR_RADIUS);
mDestinationCtx = aDestinationCtx;
// If not blurring, draw directly onto the destination device
if (blurRadius <= 0) {
mContext = aDestinationCtx;
return mContext;
}
// Convert from app units to device pixels
gfxRect rect = RectToGfxRect(aRect, aAppUnitsPerDevPixel);
gfxRect dirtyRect = RectToGfxRect(aDirtyRect, aAppUnitsPerDevPixel);
dirtyRect.RoundOut();
// Create the temporary surface for blurring
mContext = blur.Init(rect, gfxIntSize(blurRadius, blurRadius),
&dirtyRect, aSkipRect);
return mContext;
}
void
nsContextBoxBlur::DoPaint()
{
if (mContext == mDestinationCtx)
return;
blur.Paint(mDestinationCtx);
}
gfxContext*
nsContextBoxBlur::GetContext()
{
return mContext;
}
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