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-rw-r--r--gfx/2d/DrawTarget.cpp355
1 files changed, 355 insertions, 0 deletions
diff --git a/gfx/2d/DrawTarget.cpp b/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) {
+ if (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