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gecko-dev/layout/svg/nsSVGMaskFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Main header first:
#include "nsSVGMaskFrame.h"
// Keep others in (case-insensitive) order:
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/RefPtr.h"
#include "nsSVGEffects.h"
#include "mozilla/dom/SVGMaskElement.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
/**
* Byte offsets of channels in a native packed gfxColor or cairo image surface.
*/
#ifdef IS_BIG_ENDIAN
#define GFX_ARGB32_OFFSET_A 0
#define GFX_ARGB32_OFFSET_R 1
#define GFX_ARGB32_OFFSET_G 2
#define GFX_ARGB32_OFFSET_B 3
#else
#define GFX_ARGB32_OFFSET_A 3
#define GFX_ARGB32_OFFSET_R 2
#define GFX_ARGB32_OFFSET_G 1
#define GFX_ARGB32_OFFSET_B 0
#endif
// c = n / 255
// c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5
static const uint8_t gsRGBToLinearRGBMap[256] = {
0, 0, 0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 2, 2, 2, 2, 2, 2,
2, 2, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7,
8, 8, 8, 8, 9, 9, 9, 10,
10, 10, 11, 11, 12, 12, 12, 13,
13, 13, 14, 14, 15, 15, 16, 16,
17, 17, 17, 18, 18, 19, 19, 20,
20, 21, 22, 22, 23, 23, 24, 24,
25, 25, 26, 27, 27, 28, 29, 29,
30, 30, 31, 32, 32, 33, 34, 35,
35, 36, 37, 37, 38, 39, 40, 41,
41, 42, 43, 44, 45, 45, 46, 47,
48, 49, 50, 51, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62,
63, 64, 65, 66, 67, 68, 69, 70,
71, 72, 73, 74, 76, 77, 78, 79,
80, 81, 82, 84, 85, 86, 87, 88,
90, 91, 92, 93, 95, 96, 97, 99,
100, 101, 103, 104, 105, 107, 108, 109,
111, 112, 114, 115, 116, 118, 119, 121,
122, 124, 125, 127, 128, 130, 131, 133,
134, 136, 138, 139, 141, 142, 144, 146,
147, 149, 151, 152, 154, 156, 157, 159,
161, 163, 164, 166, 168, 170, 171, 173,
175, 177, 179, 181, 183, 184, 186, 188,
190, 192, 194, 196, 198, 200, 202, 204,
206, 208, 210, 212, 214, 216, 218, 220,
222, 224, 226, 229, 231, 233, 235, 237,
239, 242, 244, 246, 248, 250, 253, 255
};
static void
ComputesRGBLuminanceMask(uint8_t *aData,
int32_t aStride,
const IntSize &aSize,
float aOpacity)
{
for (int32_t y = 0; y < aSize.height; y++) {
for (int32_t x = 0; x < aSize.width; x++) {
uint8_t *pixel = aData + aStride * y + 4 * x;
uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
uint8_t luminance;
if (a) {
/* sRGB -> intensity (unpremultiply cancels out the
* (a/255.0) multiplication with aOpacity */
luminance =
static_cast<uint8_t>
((pixel[GFX_ARGB32_OFFSET_R] * 0.2125 +
pixel[GFX_ARGB32_OFFSET_G] * 0.7154 +
pixel[GFX_ARGB32_OFFSET_B] * 0.0721) *
aOpacity);
} else {
luminance = 0;
}
memset(pixel, luminance, 4);
}
}
}
static void
ComputeLinearRGBLuminanceMask(uint8_t *aData,
int32_t aStride,
const IntSize &aSize,
float aOpacity)
{
for (int32_t y = 0; y < aSize.height; y++) {
for (int32_t x = 0; x < aSize.width; x++) {
uint8_t *pixel = aData + aStride * y + 4 * x;
uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
uint8_t luminance;
// unpremultiply
if (a) {
if (a != 255) {
pixel[GFX_ARGB32_OFFSET_B] =
(255 * pixel[GFX_ARGB32_OFFSET_B]) / a;
pixel[GFX_ARGB32_OFFSET_G] =
(255 * pixel[GFX_ARGB32_OFFSET_G]) / a;
pixel[GFX_ARGB32_OFFSET_R] =
(255 * pixel[GFX_ARGB32_OFFSET_R]) / a;
}
/* sRGB -> linearRGB -> intensity */
luminance =
static_cast<uint8_t>
((gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_R]] *
0.2125 +
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_G]] *
0.7154 +
gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_B]] *
0.0721) * (a / 255.0) * aOpacity);
} else {
luminance = 0;
}
memset(pixel, luminance, 4);
}
}
}
static void
ComputeAlphaMask(uint8_t *aData,
int32_t aStride,
const IntSize &aSize,
float aOpacity)
{
for (int32_t y = 0; y < aSize.height; y++) {
for (int32_t x = 0; x < aSize.width; x++) {
uint8_t *pixel = aData + aStride * y + 4 * x;
uint8_t luminance = pixel[GFX_ARGB32_OFFSET_A] * aOpacity;
memset(pixel, luminance, 4);
}
}
}
//----------------------------------------------------------------------
// Implementation
nsIFrame*
NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsSVGMaskFrame(aContext);
}
NS_IMPL_FRAMEARENA_HELPERS(nsSVGMaskFrame)
TemporaryRef<SourceSurface>
nsSVGMaskFrame::GetMaskForMaskedFrame(gfxContext* aContext,
nsIFrame* aMaskedFrame,
const gfxMatrix &aMatrix,
float aOpacity,
Matrix* aMaskTransform)
{
// If the flag is set when we get here, it means this mask frame
// has already been used painting the current mask, and the document
// has a mask reference loop.
if (mInUse) {
NS_WARNING("Mask loop detected!");
return nullptr;
}
AutoMaskReferencer maskRef(this);
SVGMaskElement *maskElem = static_cast<SVGMaskElement*>(mContent);
uint16_t units =
maskElem->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue();
gfxRect bbox;
if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
bbox = nsSVGUtils::GetBBox(aMaskedFrame);
}
// Bounds in the user space of aMaskedFrame
gfxRect maskArea = nsSVGUtils::GetRelativeRect(units,
&maskElem->mLengthAttributes[SVGMaskElement::ATTR_X],
bbox, aMaskedFrame);
// Get the clip extents in device space:
// Minimizing the mask surface extents (using both the current clip extents
// and maskArea) is important for performance.
aContext->Save();
nsSVGUtils::SetClipRect(aContext, aMatrix, maskArea);
aContext->SetMatrix(gfxMatrix());
gfxRect maskSurfaceRect = aContext->GetClipExtents();
maskSurfaceRect.RoundOut();
aContext->Restore();
bool resultOverflows;
IntSize maskSurfaceSize =
ToIntSize(nsSVGUtils::ConvertToSurfaceSize(maskSurfaceRect.Size(),
&resultOverflows));
if (resultOverflows || maskSurfaceSize.IsEmpty()) {
// XXXjwatt we should return an empty surface so we don't paint aMaskedFrame!
return nullptr;
}
RefPtr<DrawTarget> maskDT =
Factory::CreateDrawTarget(BackendType::CAIRO, maskSurfaceSize,
SurfaceFormat::B8G8R8A8);
if (!maskDT) {
return nullptr;
}
gfxMatrix maskSurfaceMatrix =
aContext->CurrentMatrix() * gfxMatrix::Translation(-maskSurfaceRect.TopLeft());
nsRefPtr<gfxContext> tmpCtx = new gfxContext(maskDT);
tmpCtx->SetMatrix(maskSurfaceMatrix);
mMatrixForChildren = GetMaskTransform(aMaskedFrame) * aMatrix;
for (nsIFrame* kid = mFrames.FirstChild(); kid;
kid = kid->GetNextSibling()) {
// The CTM of each frame referencing us can be different
nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
if (SVGFrame) {
SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
}
gfxMatrix m = mMatrixForChildren;
if (kid->GetContent()->IsSVG()) {
m = static_cast<nsSVGElement*>(kid->GetContent())->
PrependLocalTransformsTo(m);
}
nsSVGUtils::PaintFrameWithEffects(kid, *tmpCtx, mMatrixForChildren);
}
RefPtr<SourceSurface> maskSnapshot = maskDT->Snapshot();
if (!maskSnapshot) {
return nullptr;
}
RefPtr<DataSourceSurface> maskSurface = maskSnapshot->GetDataSurface();
DataSourceSurface::MappedSurface map;
if (!maskSurface->Map(DataSourceSurface::MapType::READ_WRITE, &map)) {
return nullptr;
}
if (StyleSVGReset()->mMaskType == NS_STYLE_MASK_TYPE_LUMINANCE) {
if (StyleSVG()->mColorInterpolation ==
NS_STYLE_COLOR_INTERPOLATION_LINEARRGB) {
ComputeLinearRGBLuminanceMask(map.mData, map.mStride, maskSurfaceSize, aOpacity);
} else {
ComputesRGBLuminanceMask(map.mData, map.mStride, maskSurfaceSize, aOpacity);
}
} else {
ComputeAlphaMask(map.mData, map.mStride, maskSurfaceSize, aOpacity);
}
maskSurface->Unmap();
// Moz2D transforms in the opposite direction to Thebes
if (!maskSurfaceMatrix.Invert()) {
return nullptr;
}
*aMaskTransform = ToMatrix(maskSurfaceMatrix);
return maskSurface;
}
nsresult
nsSVGMaskFrame::AttributeChanged(int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None &&
(aAttribute == nsGkAtoms::x ||
aAttribute == nsGkAtoms::y ||
aAttribute == nsGkAtoms::width ||
aAttribute == nsGkAtoms::height||
aAttribute == nsGkAtoms::maskUnits ||
aAttribute == nsGkAtoms::maskContentUnits)) {
nsSVGEffects::InvalidateDirectRenderingObservers(this);
}
return nsSVGMaskFrameBase::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
}
#ifdef DEBUG
void
nsSVGMaskFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
NS_ASSERTION(aContent->IsSVG(nsGkAtoms::mask),
"Content is not an SVG mask");
nsSVGMaskFrameBase::Init(aContent, aParent, aPrevInFlow);
}
#endif /* DEBUG */
nsIAtom *
nsSVGMaskFrame::GetType() const
{
return nsGkAtoms::svgMaskFrame;
}
gfxMatrix
nsSVGMaskFrame::GetCanvasTM()
{
return mMatrixForChildren;
}
gfxMatrix
nsSVGMaskFrame::GetMaskTransform(nsIFrame* aMaskedFrame)
{
SVGMaskElement *content = static_cast<SVGMaskElement*>(mContent);
nsSVGEnum* maskContentUnits =
&content->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS];
return nsSVGUtils::AdjustMatrixForUnits(gfxMatrix(), maskContentUnits,
aMaskedFrame);
}
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