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Diffstat (limited to 'gfx/2d/DrawTarget.cpp')
| -rw-r--r-- | gfx/2d/DrawTarget.cpp | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/gfx/2d/DrawTarget.cpp b/gfx/2d/DrawTarget.cpp new file mode 100644 index 0000000000..11a7ca5afb --- /dev/null +++ b/gfx/2d/DrawTarget.cpp @@ -0,0 +1,334 @@ +/* -*- 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::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) { + 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 |