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gecko-dev/gfx/2d/DrawTarget.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "2D.h"
#include "Blur.h"
#include "Logging.h"
#include "PathHelpers.h"
#include "SourceSurfaceRawData.h"
#include "Tools.h"
#include "BufferEdgePad.h"
#include "BufferUnrotate.h"
#ifdef USE_NEON
# include "mozilla/arm.h"
# include "LuminanceNEON.h"
#endif
namespace mozilla {
namespace 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(const uint8_t* aSourceData,
int32_t aSourceStride, uint8_t* aDestData,
int32_t aDestStride, const IntSize& aSize,
float aOpacity) {
#ifdef USE_NEON
if (mozilla::supports_neon()) {
ComputesRGBLuminanceMask_NEON(aSourceData, aSourceStride, aDestData,
aDestStride, aSize, aOpacity);
return;
}
#endif
int32_t redFactor = 55 * aOpacity; // 255 * 0.2125 * opacity
int32_t greenFactor = 183 * aOpacity; // 255 * 0.7154 * opacity
int32_t blueFactor = 18 * aOpacity; // 255 * 0.0721
int32_t sourceOffset = aSourceStride - 4 * aSize.width;
const uint8_t* sourcePixel = aSourceData;
int32_t destOffset = aDestStride - aSize.width;
uint8_t* destPixel = aDestData;
for (int32_t y = 0; y < aSize.height; y++) {
for (int32_t x = 0; x < aSize.width; x++) {
uint8_t a = sourcePixel[GFX_ARGB32_OFFSET_A];
if (a) {
*destPixel = (redFactor * sourcePixel[GFX_ARGB32_OFFSET_R] +
greenFactor * sourcePixel[GFX_ARGB32_OFFSET_G] +
blueFactor * sourcePixel[GFX_ARGB32_OFFSET_B]) >>
8;
} else {
*destPixel = 0;
}
sourcePixel += 4;
destPixel++;
}
sourcePixel += sourceOffset;
destPixel += destOffset;
}
}
static void ComputeLinearRGBLuminanceMask(
const uint8_t* aSourceData, int32_t aSourceStride, uint8_t* aDestData,
int32_t aDestStride, const IntSize& aSize, float aOpacity) {
int32_t redFactor = 55 * aOpacity; // 255 * 0.2125 * opacity
int32_t greenFactor = 183 * aOpacity; // 255 * 0.7154 * opacity
int32_t blueFactor = 18 * aOpacity; // 255 * 0.0721
int32_t sourceOffset = aSourceStride - 4 * aSize.width;
const uint8_t* sourcePixel = aSourceData;
int32_t destOffset = aDestStride - aSize.width;
uint8_t* destPixel = aDestData;
for (int32_t y = 0; y < aSize.height; y++) {
for (int32_t x = 0; x < aSize.width; x++) {
uint8_t a = sourcePixel[GFX_ARGB32_OFFSET_A];
// unpremultiply
if (a) {
if (a == 255) {
/* sRGB -> linearRGB -> intensity */
*destPixel = static_cast<uint8_t>(
(gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_R]] *
redFactor +
gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_G]] *
greenFactor +
gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_B]] *
blueFactor) >>
8);
} else {
uint8_t tempPixel[4];
tempPixel[GFX_ARGB32_OFFSET_B] =
(255 * sourcePixel[GFX_ARGB32_OFFSET_B]) / a;
tempPixel[GFX_ARGB32_OFFSET_G] =
(255 * sourcePixel[GFX_ARGB32_OFFSET_G]) / a;
tempPixel[GFX_ARGB32_OFFSET_R] =
(255 * sourcePixel[GFX_ARGB32_OFFSET_R]) / a;
/* sRGB -> linearRGB -> intensity */
*destPixel = static_cast<uint8_t>(
((gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_R]] *
redFactor +
gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_G]] *
greenFactor +
gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_B]] *
blueFactor) >>
8) *
(a / 255.0f));
}
} else {
*destPixel = 0;
}
sourcePixel += 4;
destPixel++;
}
sourcePixel += sourceOffset;
destPixel += destOffset;
}
}
void DrawTarget::PushDeviceSpaceClipRects(const IntRect* aRects,
uint32_t aCount) {
Matrix oldTransform = GetTransform();
SetTransform(Matrix());
RefPtr<PathBuilder> pathBuilder = CreatePathBuilder();
for (uint32_t i = 0; i < aCount; i++) {
AppendRectToPath(pathBuilder, Rect(aRects[i]));
}
RefPtr<Path> path = pathBuilder->Finish();
PushClip(path);
SetTransform(oldTransform);
}
void DrawTarget::FillRoundedRect(const RoundedRect& aRect,
const Pattern& aPattern,
const DrawOptions& aOptions) {
RefPtr<Path> path = MakePathForRoundedRect(*this, aRect.rect, aRect.corners);
Fill(path, aPattern, aOptions);
}
void DrawTarget::StrokeCircle(const Point& aOrigin, float radius,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) {
RefPtr<Path> path = MakePathForCircle(*this, aOrigin, radius);
Stroke(path, aPattern, aStrokeOptions, aOptions);
}
void DrawTarget::FillCircle(const Point& aOrigin, float radius,
const Pattern& aPattern,
const DrawOptions& aOptions) {
RefPtr<Path> path = MakePathForCircle(*this, aOrigin, radius);
Fill(path, aPattern, aOptions);
}
void DrawTarget::StrokeGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) {
RefPtr<Path> path = aFont->GetPathForGlyphs(aBuffer, this);
Stroke(path, aPattern, aStrokeOptions, aOptions);
}
already_AddRefed<SourceSurface> DrawTarget::IntoLuminanceSource(
LuminanceType aMaskType, float aOpacity) {
// The default IntoLuminanceSource implementation needs a format of B8G8R8A8.
if (mFormat != SurfaceFormat::B8G8R8A8) {
return nullptr;
}
RefPtr<SourceSurface> surface = Snapshot();
if (!surface) {
return nullptr;
}
IntSize size = surface->GetSize();
RefPtr<DataSourceSurface> maskSurface = surface->GetDataSurface();
if (!maskSurface) {
return nullptr;
}
DataSourceSurface::MappedSurface map;
if (!maskSurface->Map(DataSourceSurface::MapType::READ, &map)) {
return nullptr;
}
// Create alpha channel mask for output
RefPtr<SourceSurfaceAlignedRawData> destMaskSurface =
new SourceSurfaceAlignedRawData;
if (!destMaskSurface->Init(size, SurfaceFormat::A8, false, 0)) {
return nullptr;
}
DataSourceSurface::MappedSurface destMap;
if (!destMaskSurface->Map(DataSourceSurface::MapType::WRITE, &destMap)) {
return nullptr;
}
switch (aMaskType) {
case LuminanceType::LUMINANCE: {
ComputesRGBLuminanceMask(map.mData, map.mStride, destMap.mData,
destMap.mStride, size, aOpacity);
break;
}
case LuminanceType::LINEARRGB: {
ComputeLinearRGBLuminanceMask(map.mData, map.mStride, destMap.mData,
destMap.mStride, size, aOpacity);
break;
}
}
maskSurface->Unmap();
destMaskSurface->Unmap();
return destMaskSurface.forget();
}
void DrawTarget::Blur(const AlphaBoxBlur& aBlur) {
uint8_t* data;
IntSize size;
int32_t stride;
SurfaceFormat format;
if (!LockBits(&data, &size, &stride, &format)) {
gfxWarning() << "Cannot perform in-place blur on non-data DrawTarget";
return;
}
// Sanity check that the blur size matches the draw target.
MOZ_ASSERT(size == aBlur.GetSize());
MOZ_ASSERT(stride == aBlur.GetStride());
aBlur.Blur(data);
ReleaseBits(data);
}
void DrawTarget::PadEdges(const IntRegion& aRegion) {
PadDrawTargetOutFromRegion(this, aRegion);
}
bool DrawTarget::Unrotate(IntPoint aRotation) {
unsigned char* data;
IntSize size;
int32_t stride;
SurfaceFormat format;
if (LockBits(&data, &size, &stride, &format)) {
uint8_t bytesPerPixel = BytesPerPixel(format);
BufferUnrotate(data, size.width * bytesPerPixel, size.height, stride,
aRotation.x * bytesPerPixel, aRotation.y);
ReleaseBits(data);
return true;
}
return false;
}
int32_t ShadowOptions::BlurRadius() const {
return AlphaBoxBlur::CalculateBlurRadius(Point(mSigma, mSigma)).width;
}
void DrawTarget::DrawShadow(const Path* aPath, const Pattern& aPattern,
const ShadowOptions& aShadow,
const DrawOptions& aOptions,
const StrokeOptions* aStrokeOptions) {
// Get the approximate bounds of the source path
Rect bounds = aPath->GetFastBounds(GetTransform(), aStrokeOptions);
if (bounds.IsEmpty()) {
return;
}
// Inflate the bounds by the blur radius
bounds += aShadow.mOffset;
int32_t blurRadius = aShadow.BlurRadius();
bounds.Inflate(blurRadius);
bounds.RoundOut();
// Check if the bounds intersect the viewport
Rect viewport(GetRect());
viewport.Inflate(blurRadius);
bounds = bounds.Intersect(viewport);
IntRect intBounds;
if (bounds.IsEmpty() || !bounds.ToIntRect(&intBounds) ||
!CanCreateSimilarDrawTarget(intBounds.Size(), SurfaceFormat::A8)) {
return;
}
// Create a draw target for drawing the shadow mask with enough room for blur
RefPtr<DrawTarget> shadowTarget = CreateShadowDrawTarget(
intBounds.Size(), SurfaceFormat::A8, aShadow.mSigma);
if (shadowTarget) {
// See bug 1524554.
shadowTarget->ClearRect(Rect());
}
if (!shadowTarget || !shadowTarget->IsValid()) {
return;
}
// Draw the path into the target for the initial shadow mask
Point offset = Point(intBounds.TopLeft()) - aShadow.mOffset;
shadowTarget->SetTransform(GetTransform().PostTranslate(-offset));
DrawOptions shadowDrawOptions(
aOptions.mAlpha, CompositionOp::OP_OVER,
blurRadius > 1 ? AntialiasMode::NONE : aOptions.mAntialiasMode);
if (aStrokeOptions) {
shadowTarget->Stroke(aPath, aPattern, *aStrokeOptions, shadowDrawOptions);
} else {
shadowTarget->Fill(aPath, aPattern, shadowDrawOptions);
}
RefPtr<SourceSurface> snapshot = shadowTarget->Snapshot();
// Finally, hand a snapshot of the mask to DrawSurfaceWithShadow for the
// final shadow blur
if (snapshot) {
DrawSurfaceWithShadow(snapshot, offset, aShadow, aOptions.mCompositionOp);
}
}
} // namespace gfx
} // namespace mozilla
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