| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/core/SkColorSpace.h" |
| #include "src/core/SkArenaAlloc.h" |
| #include "src/core/SkColorSpacePriv.h" |
| #include "src/core/SkColorSpaceXformSteps.h" |
| #include "src/core/SkCoreBlitters.h" |
| #include "src/core/SkOpts.h" |
| #include "src/core/SkRasterPipeline.h" |
| #include "src/core/SkSpriteBlitter.h" |
| |
| SkSpriteBlitter::SkSpriteBlitter(const SkPixmap& source) |
| : fSource(source) {} |
| |
| void SkSpriteBlitter::setup(const SkPixmap& dst, int left, int top, const SkPaint& paint) { |
| fDst = dst; |
| fLeft = left; |
| fTop = top; |
| fPaint = &paint; |
| } |
| |
| void SkSpriteBlitter::blitH(int x, int y, int width) { |
| SkDEBUGFAIL("how did we get here?"); |
| |
| // Fallback to blitRect. |
| this->blitRect(x, y, width, 1); |
| } |
| |
| void SkSpriteBlitter::blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) { |
| SkDEBUGFAIL("how did we get here?"); |
| |
| // No fallback strategy. |
| } |
| |
| void SkSpriteBlitter::blitV(int x, int y, int height, SkAlpha alpha) { |
| SkDEBUGFAIL("how did we get here?"); |
| |
| // Fall back to superclass if the code gets here in release mode. |
| INHERITED::blitV(x, y, height, alpha); |
| } |
| |
| void SkSpriteBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { |
| SkDEBUGFAIL("how did we get here?"); |
| |
| // Fall back to superclass if the code gets here in release mode. |
| INHERITED::blitMask(mask, clip); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| class SkSpriteBlitter_Memcpy final : public SkSpriteBlitter { |
| public: |
| static bool Supports(const SkPixmap& dst, const SkPixmap& src, const SkPaint& paint) { |
| // the caller has already inspected the colorspace on src and dst |
| SkASSERT(!SkColorSpaceXformSteps::Required(src.colorSpace(), dst.colorSpace())); |
| |
| if (dst.colorType() != src.colorType()) { |
| return false; |
| } |
| if (paint.getMaskFilter() || paint.getColorFilter() || paint.getImageFilter()) { |
| return false; |
| } |
| if (0xFF != paint.getAlpha()) { |
| return false; |
| } |
| SkBlendMode mode = paint.getBlendMode(); |
| return SkBlendMode::kSrc == mode || (SkBlendMode::kSrcOver == mode && src.isOpaque()); |
| } |
| |
| SkSpriteBlitter_Memcpy(const SkPixmap& src) |
| : INHERITED(src) {} |
| |
| void blitRect(int x, int y, int width, int height) override { |
| SkASSERT(fDst.colorType() == fSource.colorType()); |
| SkASSERT(width > 0 && height > 0); |
| |
| char* dst = (char*)fDst.writable_addr(x, y); |
| const char* src = (const char*)fSource.addr(x - fLeft, y - fTop); |
| const size_t dstRB = fDst.rowBytes(); |
| const size_t srcRB = fSource.rowBytes(); |
| const size_t bytesToCopy = width << fSource.shiftPerPixel(); |
| |
| while (height --> 0) { |
| memcpy(dst, src, bytesToCopy); |
| dst += dstRB; |
| src += srcRB; |
| } |
| } |
| |
| private: |
| typedef SkSpriteBlitter INHERITED; |
| }; |
| |
| class SkRasterPipelineSpriteBlitter : public SkSpriteBlitter { |
| public: |
| SkRasterPipelineSpriteBlitter(const SkPixmap& src, SkArenaAlloc* alloc) |
| : INHERITED(src) |
| , fAlloc(alloc) |
| , fBlitter(nullptr) |
| , fSrcPtr{nullptr, 0} |
| {} |
| |
| void setup(const SkPixmap& dst, int left, int top, const SkPaint& paint) override { |
| fDst = dst; |
| fLeft = left; |
| fTop = top; |
| fPaintColor = paint.getColor4f(); |
| |
| SkRasterPipeline p(fAlloc); |
| p.append_load(fSource.colorType(), &fSrcPtr); |
| |
| if (fSource.colorType() == kAlpha_8_SkColorType) { |
| // The color for A8 images comes from the (sRGB) paint color. |
| p.append_set_rgb(fAlloc, fPaintColor); |
| p.append(SkRasterPipeline::premul); |
| } |
| if (auto dstCS = fDst.colorSpace()) { |
| auto srcCS = fSource.colorSpace(); |
| if (!srcCS || fSource.colorType() == kAlpha_8_SkColorType) { |
| // We treat untagged images as sRGB. |
| // A8 images get their r,g,b from the paint color, so they're also sRGB. |
| srcCS = sk_srgb_singleton(); |
| } |
| auto srcAT = fSource.isOpaque() ? kOpaque_SkAlphaType |
| : kPremul_SkAlphaType; |
| fAlloc->make<SkColorSpaceXformSteps>(srcCS, srcAT, |
| dstCS, kPremul_SkAlphaType) |
| ->apply(&p, fSource.colorType()); |
| } |
| if (fPaintColor.fA != 1.0f) { |
| p.append(SkRasterPipeline::scale_1_float, &fPaintColor.fA); |
| } |
| |
| bool is_opaque = fSource.isOpaque() && fPaintColor.fA == 1.0f; |
| fBlitter = SkCreateRasterPipelineBlitter(fDst, paint, p, is_opaque, fAlloc); |
| } |
| |
| void blitRect(int x, int y, int width, int height) override { |
| fSrcPtr.stride = fSource.rowBytesAsPixels(); |
| |
| // We really want fSrcPtr.pixels = fSource.addr(-fLeft, -fTop) here, but that asserts. |
| // Instead we ask for addr(-fLeft+x, -fTop+y), then back up (x,y) manually. |
| // Representing bpp as a size_t keeps all this math in size_t instead of int, |
| // which could wrap around with large enough fSrcPtr.stride and y. |
| size_t bpp = fSource.info().bytesPerPixel(); |
| fSrcPtr.pixels = (char*)fSource.addr(-fLeft+x, -fTop+y) - bpp * x |
| - bpp * y * fSrcPtr.stride; |
| |
| fBlitter->blitRect(x,y,width,height); |
| } |
| |
| private: |
| SkArenaAlloc* fAlloc; |
| SkBlitter* fBlitter; |
| SkRasterPipeline_MemoryCtx fSrcPtr; |
| SkColor4f fPaintColor; |
| |
| typedef SkSpriteBlitter INHERITED; |
| }; |
| |
| // returning null means the caller will call SkBlitter::Choose() and |
| // have wrapped the source bitmap inside a shader |
| SkBlitter* SkBlitter::ChooseSprite(const SkPixmap& dst, const SkPaint& paint, |
| const SkPixmap& source, int left, int top, SkArenaAlloc* allocator) { |
| /* We currently ignore antialiasing and filtertype, meaning we will take our |
| special blitters regardless of these settings. Ignoring filtertype seems fine |
| since by definition there is no scale in the matrix. Ignoring antialiasing is |
| a bit of a hack, since we "could" pass in the fractional left/top for the bitmap, |
| and respect that by blending the edges of the bitmap against the device. To support |
| this we could either add more special blitters here, or detect antialiasing in the |
| paint and return null if it is set, forcing the client to take the slow shader case |
| (which does respect soft edges). |
| */ |
| SkASSERT(allocator != nullptr); |
| |
| if (source.alphaType() == kUnpremul_SkAlphaType) { |
| return nullptr; |
| } |
| |
| SkSpriteBlitter* blitter = nullptr; |
| |
| if (!SkColorSpaceXformSteps::Required(source.colorSpace(), dst.colorSpace())) { |
| if (!blitter && SkSpriteBlitter_Memcpy::Supports(dst, source, paint)) { |
| blitter = allocator->make<SkSpriteBlitter_Memcpy>(source); |
| } |
| if (!blitter) { |
| switch (dst.colorType()) { |
| case kRGB_565_SkColorType: |
| blitter = SkSpriteBlitter::ChooseL565(source, paint, allocator); |
| break; |
| case kAlpha_8_SkColorType: |
| blitter = SkSpriteBlitter::ChooseLA8(source, paint, allocator); |
| break; |
| default: |
| if (dst.colorType() == kN32_SkColorType) { |
| blitter = SkSpriteBlitter::ChooseL32(source, paint, allocator); |
| } |
| break; |
| } |
| } |
| } |
| if (!blitter && !paint.getMaskFilter()) { |
| blitter = allocator->make<SkRasterPipelineSpriteBlitter>(source, allocator); |
| } |
| |
| if (blitter) { |
| blitter->setup(dst, left, top, paint); |
| } |
| return blitter; |
| } |