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

278 строки
8.8 KiB
C++

/* -*- Mode: C++; tab-width: 20; 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/. */
#include "2D.h"
#include "Logging.h"
#include "PathHelpers.h"
#include "DrawTargetCapture.h"
#ifdef BUILD_ARM_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 BUILD_ARM_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;
}
}
already_AddRefed<DrawTargetCapture>
DrawTarget::CreateCaptureDT(const IntSize& aSize)
{
RefPtr<DrawTargetCaptureImpl> dt = new DrawTargetCaptureImpl();
if (!dt->Init(aSize, this)) {
gfxWarning() << "Failed to initialize Capture DrawTarget!";
return nullptr;
}
return dt.forget();
}
void
DrawTarget::DrawCapturedDT(DrawTargetCapture *aCaptureDT,
const Matrix& aTransform)
{
if (aTransform.HasNonIntegerTranslation()) {
gfxWarning() << "Non integer translations are not supported for DrawCaptureDT at this time!";
return;
}
static_cast<DrawTargetCaptureImpl*>(aCaptureDT)->ReplayToDrawTarget(this, aTransform);
}
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::StrokeGlyphs(ScaledFont* aFont,
const GlyphBuffer& aBuffer,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions,
const GlyphRenderingOptions* aRenderingOptions)
{
RefPtr<Path> path = aFont->GetPathForGlyphs(aBuffer, this);
Stroke(path, aPattern, aStrokeOptions, aOptions);
}
already_AddRefed<SourceSurface>
DrawTarget::IntoLuminanceSource(LuminanceType aMaskType, float aOpacity)
{
RefPtr<SourceSurface> surface = Snapshot();
IntSize size = surface->GetSize();
RefPtr<DataSourceSurface> maskSurface = surface->GetDataSurface();
DataSourceSurface::MappedSurface map;
if (!maskSurface->Map(DataSourceSurface::MapType::READ, &map)) {
return nullptr;
}
// Create alpha channel mask for output
RefPtr<DataSourceSurface> destMaskSurface =
Factory::CreateDataSourceSurface(size, SurfaceFormat::A8);
if (!destMaskSurface) {
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();
}
} // namespace gfx
} // namespace mozilla