forked from mirrors/gecko-dev
354 lines
12 KiB
C++
354 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "2D.h"
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#include "Blur.h"
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#include "Logging.h"
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#include "PathHelpers.h"
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#include "SourceSurfaceRawData.h"
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#include "Tools.h"
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#include "BufferEdgePad.h"
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#include "BufferUnrotate.h"
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#ifdef USE_NEON
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# include "mozilla/arm.h"
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# include "LuminanceNEON.h"
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#endif
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namespace mozilla {
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namespace gfx {
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/**
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* Byte offsets of channels in a native packed gfxColor or cairo image surface.
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*/
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#ifdef IS_BIG_ENDIAN
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# define GFX_ARGB32_OFFSET_A 0
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# define GFX_ARGB32_OFFSET_R 1
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# define GFX_ARGB32_OFFSET_G 2
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# define GFX_ARGB32_OFFSET_B 3
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#else
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# define GFX_ARGB32_OFFSET_A 3
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# define GFX_ARGB32_OFFSET_R 2
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# define GFX_ARGB32_OFFSET_G 1
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# define GFX_ARGB32_OFFSET_B 0
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#endif
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// c = n / 255
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// c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5
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static const uint8_t gsRGBToLinearRGBMap[256] = {
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0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1,
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1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3,
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3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6,
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7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11,
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12, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 17,
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18, 18, 19, 19, 20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 25,
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26, 27, 27, 28, 29, 29, 30, 30, 31, 32, 32, 33, 34, 35, 35,
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36, 37, 37, 38, 39, 40, 41, 41, 42, 43, 44, 45, 45, 46, 47,
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48, 49, 50, 51, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
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62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77,
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78, 79, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 95,
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96, 97, 99, 100, 101, 103, 104, 105, 107, 108, 109, 111, 112, 114, 115,
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116, 118, 119, 121, 122, 124, 125, 127, 128, 130, 131, 133, 134, 136, 138,
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139, 141, 142, 144, 146, 147, 149, 151, 152, 154, 156, 157, 159, 161, 163,
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164, 166, 168, 170, 171, 173, 175, 177, 179, 181, 183, 184, 186, 188, 190,
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192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220,
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222, 224, 226, 229, 231, 233, 235, 237, 239, 242, 244, 246, 248, 250, 253,
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255};
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static void ComputesRGBLuminanceMask(const uint8_t* aSourceData,
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int32_t aSourceStride, uint8_t* aDestData,
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int32_t aDestStride, const IntSize& aSize,
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float aOpacity) {
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#ifdef USE_NEON
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if (mozilla::supports_neon()) {
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ComputesRGBLuminanceMask_NEON(aSourceData, aSourceStride, aDestData,
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aDestStride, aSize, aOpacity);
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return;
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}
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#endif
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int32_t redFactor = 55 * aOpacity; // 255 * 0.2125 * opacity
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int32_t greenFactor = 183 * aOpacity; // 255 * 0.7154 * opacity
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int32_t blueFactor = 18 * aOpacity; // 255 * 0.0721
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int32_t sourceOffset = aSourceStride - 4 * aSize.width;
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const uint8_t* sourcePixel = aSourceData;
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int32_t destOffset = aDestStride - aSize.width;
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uint8_t* destPixel = aDestData;
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for (int32_t y = 0; y < aSize.height; y++) {
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for (int32_t x = 0; x < aSize.width; x++) {
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uint8_t a = sourcePixel[GFX_ARGB32_OFFSET_A];
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if (a) {
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*destPixel = (redFactor * sourcePixel[GFX_ARGB32_OFFSET_R] +
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greenFactor * sourcePixel[GFX_ARGB32_OFFSET_G] +
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blueFactor * sourcePixel[GFX_ARGB32_OFFSET_B]) >>
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8;
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} else {
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*destPixel = 0;
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}
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sourcePixel += 4;
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destPixel++;
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}
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sourcePixel += sourceOffset;
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destPixel += destOffset;
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}
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}
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static void ComputeLinearRGBLuminanceMask(
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const uint8_t* aSourceData, int32_t aSourceStride, uint8_t* aDestData,
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int32_t aDestStride, const IntSize& aSize, float aOpacity) {
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int32_t redFactor = 55 * aOpacity; // 255 * 0.2125 * opacity
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int32_t greenFactor = 183 * aOpacity; // 255 * 0.7154 * opacity
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int32_t blueFactor = 18 * aOpacity; // 255 * 0.0721
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int32_t sourceOffset = aSourceStride - 4 * aSize.width;
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const uint8_t* sourcePixel = aSourceData;
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int32_t destOffset = aDestStride - aSize.width;
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uint8_t* destPixel = aDestData;
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for (int32_t y = 0; y < aSize.height; y++) {
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for (int32_t x = 0; x < aSize.width; x++) {
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uint8_t a = sourcePixel[GFX_ARGB32_OFFSET_A];
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// unpremultiply
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if (a) {
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if (a == 255) {
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/* sRGB -> linearRGB -> intensity */
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*destPixel = static_cast<uint8_t>(
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(gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_R]] *
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redFactor +
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gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_G]] *
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greenFactor +
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gsRGBToLinearRGBMap[sourcePixel[GFX_ARGB32_OFFSET_B]] *
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blueFactor) >>
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8);
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} else {
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uint8_t tempPixel[4];
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tempPixel[GFX_ARGB32_OFFSET_B] =
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(255 * sourcePixel[GFX_ARGB32_OFFSET_B]) / a;
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tempPixel[GFX_ARGB32_OFFSET_G] =
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(255 * sourcePixel[GFX_ARGB32_OFFSET_G]) / a;
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tempPixel[GFX_ARGB32_OFFSET_R] =
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(255 * sourcePixel[GFX_ARGB32_OFFSET_R]) / a;
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/* sRGB -> linearRGB -> intensity */
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*destPixel = static_cast<uint8_t>(
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((gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_R]] *
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redFactor +
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gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_G]] *
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greenFactor +
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gsRGBToLinearRGBMap[tempPixel[GFX_ARGB32_OFFSET_B]] *
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blueFactor) >>
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8) *
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(a / 255.0f));
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}
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} else {
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*destPixel = 0;
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}
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sourcePixel += 4;
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destPixel++;
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}
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sourcePixel += sourceOffset;
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destPixel += destOffset;
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}
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}
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void DrawTarget::PushDeviceSpaceClipRects(const IntRect* aRects,
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uint32_t aCount) {
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Matrix oldTransform = GetTransform();
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SetTransform(Matrix());
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RefPtr<PathBuilder> pathBuilder = CreatePathBuilder();
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for (uint32_t i = 0; i < aCount; i++) {
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AppendRectToPath(pathBuilder, Rect(aRects[i]));
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}
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RefPtr<Path> path = pathBuilder->Finish();
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PushClip(path);
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SetTransform(oldTransform);
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}
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void DrawTarget::FillRoundedRect(const RoundedRect& aRect,
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const Pattern& aPattern,
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const DrawOptions& aOptions) {
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RefPtr<Path> path = MakePathForRoundedRect(*this, aRect.rect, aRect.corners);
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Fill(path, aPattern, aOptions);
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}
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void DrawTarget::StrokeCircle(const Point& aOrigin, float radius,
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const Pattern& aPattern,
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const StrokeOptions& aStrokeOptions,
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const DrawOptions& aOptions) {
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RefPtr<Path> path = MakePathForCircle(*this, aOrigin, radius);
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Stroke(path, aPattern, aStrokeOptions, aOptions);
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}
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void DrawTarget::FillCircle(const Point& aOrigin, float radius,
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const Pattern& aPattern,
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const DrawOptions& aOptions) {
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RefPtr<Path> path = MakePathForCircle(*this, aOrigin, radius);
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Fill(path, aPattern, aOptions);
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}
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void DrawTarget::StrokeGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
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const Pattern& aPattern,
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const StrokeOptions& aStrokeOptions,
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const DrawOptions& aOptions) {
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RefPtr<Path> path = aFont->GetPathForGlyphs(aBuffer, this);
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Stroke(path, aPattern, aStrokeOptions, aOptions);
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}
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already_AddRefed<SourceSurface> DrawTarget::IntoLuminanceSource(
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LuminanceType aMaskType, float aOpacity) {
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// The default IntoLuminanceSource implementation needs a format of B8G8R8A8.
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if (mFormat != SurfaceFormat::B8G8R8A8) {
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return nullptr;
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}
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RefPtr<SourceSurface> surface = Snapshot();
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if (!surface) {
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return nullptr;
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}
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IntSize size = surface->GetSize();
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RefPtr<DataSourceSurface> maskSurface = surface->GetDataSurface();
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if (!maskSurface) {
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return nullptr;
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}
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DataSourceSurface::MappedSurface map;
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if (!maskSurface->Map(DataSourceSurface::MapType::READ, &map)) {
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return nullptr;
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}
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// Create alpha channel mask for output
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RefPtr<SourceSurfaceAlignedRawData> destMaskSurface =
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new SourceSurfaceAlignedRawData;
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if (!destMaskSurface->Init(size, SurfaceFormat::A8, false, 0)) {
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return nullptr;
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}
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DataSourceSurface::MappedSurface destMap;
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if (!destMaskSurface->Map(DataSourceSurface::MapType::WRITE, &destMap)) {
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return nullptr;
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}
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switch (aMaskType) {
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case LuminanceType::LUMINANCE: {
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ComputesRGBLuminanceMask(map.mData, map.mStride, destMap.mData,
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destMap.mStride, size, aOpacity);
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break;
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}
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case LuminanceType::LINEARRGB: {
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ComputeLinearRGBLuminanceMask(map.mData, map.mStride, destMap.mData,
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destMap.mStride, size, aOpacity);
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break;
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}
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}
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maskSurface->Unmap();
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destMaskSurface->Unmap();
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return destMaskSurface.forget();
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}
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void DrawTarget::Blur(const AlphaBoxBlur& aBlur) {
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uint8_t* data;
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IntSize size;
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int32_t stride;
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SurfaceFormat format;
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if (!LockBits(&data, &size, &stride, &format)) {
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gfxWarning() << "Cannot perform in-place blur on non-data DrawTarget";
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return;
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}
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// Sanity check that the blur size matches the draw target.
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MOZ_ASSERT(size == aBlur.GetSize());
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MOZ_ASSERT(stride == aBlur.GetStride());
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aBlur.Blur(data);
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ReleaseBits(data);
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}
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void DrawTarget::PadEdges(const IntRegion& aRegion) {
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PadDrawTargetOutFromRegion(this, aRegion);
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}
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bool DrawTarget::Unrotate(IntPoint aRotation) {
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unsigned char* data;
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IntSize size;
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int32_t stride;
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SurfaceFormat format;
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if (LockBits(&data, &size, &stride, &format)) {
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uint8_t bytesPerPixel = BytesPerPixel(format);
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BufferUnrotate(data, size.width * bytesPerPixel, size.height, stride,
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aRotation.x * bytesPerPixel, aRotation.y);
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ReleaseBits(data);
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return true;
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}
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return false;
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}
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int32_t ShadowOptions::BlurRadius() const {
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return AlphaBoxBlur::CalculateBlurRadius(Point(mSigma, mSigma)).width;
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}
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void DrawTarget::DrawShadow(const Path* aPath, const Pattern& aPattern,
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const ShadowOptions& aShadow,
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const DrawOptions& aOptions,
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const StrokeOptions* aStrokeOptions) {
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// Get the approximate bounds of the source path
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Rect bounds = aPath->GetFastBounds(GetTransform(), aStrokeOptions);
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if (bounds.IsEmpty()) {
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return;
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}
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// Inflate the bounds by the blur radius
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bounds += aShadow.mOffset;
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int32_t blurRadius = aShadow.BlurRadius();
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bounds.Inflate(blurRadius);
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bounds.RoundOut();
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// Check if the bounds intersect the viewport
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Rect viewport(GetRect());
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viewport.Inflate(blurRadius);
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bounds = bounds.Intersect(viewport);
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IntRect intBounds;
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if (bounds.IsEmpty() || !bounds.ToIntRect(&intBounds) ||
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!CanCreateSimilarDrawTarget(intBounds.Size(), SurfaceFormat::A8)) {
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return;
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}
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// Create a draw target for drawing the shadow mask with enough room for blur
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RefPtr<DrawTarget> shadowTarget = CreateShadowDrawTarget(
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intBounds.Size(), SurfaceFormat::A8, aShadow.mSigma);
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if (shadowTarget) {
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// See bug 1524554.
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shadowTarget->ClearRect(Rect());
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}
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if (!shadowTarget || !shadowTarget->IsValid()) {
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return;
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}
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// Draw the path into the target for the initial shadow mask
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Point offset = Point(intBounds.TopLeft()) - aShadow.mOffset;
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shadowTarget->SetTransform(GetTransform().PostTranslate(-offset));
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DrawOptions shadowDrawOptions(
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aOptions.mAlpha, CompositionOp::OP_OVER,
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blurRadius > 1 ? AntialiasMode::NONE : aOptions.mAntialiasMode);
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if (aStrokeOptions) {
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shadowTarget->Stroke(aPath, aPattern, *aStrokeOptions, shadowDrawOptions);
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} else {
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shadowTarget->Fill(aPath, aPattern, shadowDrawOptions);
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}
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RefPtr<SourceSurface> snapshot = shadowTarget->Snapshot();
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// Finally, hand a snapshot of the mask to DrawSurfaceWithShadow for the
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// final shadow blur
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if (snapshot) {
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DrawSurfaceWithShadow(snapshot, offset, aShadow, aOptions.mCompositionOp);
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}
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}
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} // namespace gfx
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} // namespace mozilla
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