зеркало из https://github.com/mozilla/gecko-dev.git
321 строка
10 KiB
C++
321 строка
10 KiB
C++
/* -*- 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 "gfxContext.h"
|
|
#include "gfxImageSurface.h"
|
|
#include "nsRenderingContext.h"
|
|
#include "nsSVGEffects.h"
|
|
#include "mozilla/dom/SVGMaskElement.h"
|
|
|
|
using namespace mozilla::dom;
|
|
|
|
/**
|
|
* 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 nsIntRect &aRect,
|
|
float aOpacity)
|
|
{
|
|
for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
|
|
for (int32_t x = aRect.x; x < aRect.XMost(); 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 nsIntRect &aRect,
|
|
float aOpacity)
|
|
{
|
|
for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
|
|
for (int32_t x = aRect.x; x < aRect.XMost(); 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 nsIntRect &aRect,
|
|
float aOpacity)
|
|
{
|
|
for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
|
|
for (int32_t x = aRect.x; x < aRect.XMost(); 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)
|
|
|
|
already_AddRefed<gfxPattern>
|
|
nsSVGMaskFrame::ComputeMaskAlpha(nsRenderingContext *aContext,
|
|
nsIFrame* aParent,
|
|
const gfxMatrix &aMatrix,
|
|
float aOpacity)
|
|
{
|
|
// 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 *mask = static_cast<SVGMaskElement*>(mContent);
|
|
|
|
uint16_t units =
|
|
mask->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue();
|
|
gfxRect bbox;
|
|
if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
|
|
bbox = nsSVGUtils::GetBBox(aParent);
|
|
}
|
|
|
|
gfxRect maskArea = nsSVGUtils::GetRelativeRect(units,
|
|
&mask->mLengthAttributes[SVGMaskElement::ATTR_X], bbox, aParent);
|
|
|
|
gfxContext *gfx = aContext->ThebesContext();
|
|
|
|
// Get the clip extents in device space:
|
|
gfx->Save();
|
|
nsSVGUtils::SetClipRect(gfx, aMatrix, maskArea);
|
|
gfx->IdentityMatrix();
|
|
gfxRect clipExtents = gfx->GetClipExtents();
|
|
clipExtents.RoundOut();
|
|
gfx->Restore();
|
|
|
|
bool resultOverflows;
|
|
gfxIntSize surfaceSize =
|
|
nsSVGUtils::ConvertToSurfaceSize(gfxSize(clipExtents.Width(),
|
|
clipExtents.Height()),
|
|
&resultOverflows);
|
|
|
|
// 0 disables mask, < 0 is an error
|
|
if (surfaceSize.width <= 0 || surfaceSize.height <= 0)
|
|
return nullptr;
|
|
|
|
if (resultOverflows)
|
|
return nullptr;
|
|
|
|
nsRefPtr<gfxImageSurface> image =
|
|
new gfxImageSurface(surfaceSize, gfxImageFormatARGB32);
|
|
if (!image || image->CairoStatus())
|
|
return nullptr;
|
|
|
|
// We would like to use gfxImageSurface::SetDeviceOffset() to position
|
|
// 'image'. However, we need to set the same matrix on the temporary context
|
|
// and pattern that we create below as is currently set on 'gfx'.
|
|
// Unfortunately, any device offset set by SetDeviceOffset() is affected by
|
|
// the transform passed to the SetMatrix() calls, so to avoid that we account
|
|
// for the device offset in the transform rather than use SetDeviceOffset().
|
|
gfxMatrix matrix =
|
|
gfx->CurrentMatrix() * gfxMatrix().Translate(-clipExtents.TopLeft());
|
|
|
|
nsRenderingContext tmpCtx;
|
|
tmpCtx.Init(this->PresContext()->DeviceContext(), image);
|
|
tmpCtx.ThebesContext()->SetMatrix(matrix);
|
|
|
|
mMaskParent = aParent;
|
|
if (mMaskParentMatrix) {
|
|
*mMaskParentMatrix = aMatrix;
|
|
} else {
|
|
mMaskParentMatrix = new gfxMatrix(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);
|
|
}
|
|
nsSVGUtils::PaintFrameWithEffects(&tmpCtx, nullptr, kid);
|
|
}
|
|
|
|
uint8_t *data = image->Data();
|
|
int32_t stride = image->Stride();
|
|
nsIntRect rect(0, 0, surfaceSize.width, surfaceSize.height);
|
|
|
|
if (StyleSVGReset()->mMaskType == NS_STYLE_MASK_TYPE_LUMINANCE) {
|
|
if (StyleSVG()->mColorInterpolation ==
|
|
NS_STYLE_COLOR_INTERPOLATION_LINEARRGB) {
|
|
ComputeLinearRGBLuminanceMask(data, stride, rect, aOpacity);
|
|
} else {
|
|
ComputesRGBLuminanceMask(data, stride, rect, aOpacity);
|
|
}
|
|
} else {
|
|
ComputeAlphaMask(data, stride, rect, aOpacity);
|
|
}
|
|
|
|
nsRefPtr<gfxPattern> retval = new gfxPattern(image);
|
|
retval->SetMatrix(matrix);
|
|
return retval.forget();
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
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,
|
|
nsIFrame* 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(uint32_t aFor, nsIFrame* aTransformRoot)
|
|
{
|
|
NS_ASSERTION(mMaskParentMatrix, "null parent matrix");
|
|
|
|
SVGMaskElement *mask = static_cast<SVGMaskElement*>(mContent);
|
|
|
|
return nsSVGUtils::AdjustMatrixForUnits(
|
|
mMaskParentMatrix ? *mMaskParentMatrix : gfxMatrix(),
|
|
&mask->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS],
|
|
mMaskParent);
|
|
}
|
|
|