| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkBlitter.h" |
| #include "SkBlendModePriv.h" |
| #include "SkColor.h" |
| #include "SkColorFilter.h" |
| #include "SkFixedAlloc.h" |
| #include "SkOpts.h" |
| #include "SkPM4f.h" |
| #include "SkPM4fPriv.h" |
| #include "SkRasterPipeline.h" |
| #include "SkShader.h" |
| |
| |
| class SkRasterPipelineBlitter : public SkBlitter { |
| public: |
| static SkBlitter* Create(const SkPixmap&, const SkPaint&, const SkMatrix& ctm, |
| SkTBlitterAllocator*); |
| |
| SkRasterPipelineBlitter(SkPixmap dst, SkBlendMode blend, SkPM4f paintColor) |
| : fDst(dst) |
| , fBlend(blend) |
| , fPaintColor(paintColor) |
| , fScratchAlloc(fScratch, sizeof(fScratch)) |
| , fScratchFallback(&fScratchAlloc) |
| {} |
| |
| void blitH (int x, int y, int w) override; |
| void blitAntiH(int x, int y, const SkAlpha[], const int16_t[]) override; |
| void blitMask (const SkMask&, const SkIRect& clip) override; |
| |
| // TODO: The default implementations of the other blits look fine, |
| // but some of them like blitV could probably benefit from custom |
| // blits using something like a SkRasterPipeline::runFew() method. |
| |
| private: |
| void append_load_d(SkRasterPipeline*) const; |
| void append_store (SkRasterPipeline*) const; |
| void append_blend (SkRasterPipeline*) const; |
| void maybe_clamp (SkRasterPipeline*) const; |
| |
| SkPixmap fDst; |
| SkBlendMode fBlend; |
| SkPM4f fPaintColor; |
| SkRasterPipeline fShader; |
| |
| // These functions are compiled lazily when first used. |
| std::function<void(size_t, size_t, size_t)> fBlitH = nullptr, |
| fBlitAntiH = nullptr, |
| fBlitMaskA8 = nullptr, |
| fBlitMaskLCD16 = nullptr; |
| |
| // These values are pointed to by the compiled blit functions |
| // above, which allows us to adjust them from call to call. |
| void* fDstPtr = nullptr; |
| const void* fMaskPtr = nullptr; |
| float fConstantCoverage = 0.0f; |
| |
| // Scratch space for shaders and color filters to use. |
| char fScratch[64]; |
| SkFixedAlloc fScratchAlloc; |
| SkFallbackAlloc fScratchFallback; |
| |
| typedef SkBlitter INHERITED; |
| }; |
| |
| SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst, |
| const SkPaint& paint, |
| const SkMatrix& ctm, |
| SkTBlitterAllocator* alloc) { |
| return SkRasterPipelineBlitter::Create(dst, paint, ctm, alloc); |
| } |
| |
| static bool supported(const SkImageInfo& info) { |
| switch (info.colorType()) { |
| case kN32_SkColorType: return info.gammaCloseToSRGB(); |
| case kRGBA_F16_SkColorType: return true; |
| case kRGB_565_SkColorType: return true; |
| default: return false; |
| } |
| } |
| |
| SkBlitter* SkRasterPipelineBlitter::Create(const SkPixmap& dst, |
| const SkPaint& paint, |
| const SkMatrix& ctm, |
| SkTBlitterAllocator* alloc) { |
| auto blitter = alloc->createT<SkRasterPipelineBlitter>( |
| dst, |
| paint.getBlendMode(), |
| SkPM4f_from_SkColor(paint.getColor(), dst.colorSpace())); |
| |
| auto earlyOut = [&] { |
| alloc->deleteLast(); |
| return nullptr; |
| }; |
| |
| SkBlendMode* blend = &blitter->fBlend; |
| SkPM4f* paintColor = &blitter->fPaintColor; |
| SkRasterPipeline* pipeline = &blitter->fShader; |
| |
| SkShader* shader = paint.getShader(); |
| SkColorFilter* colorFilter = paint.getColorFilter(); |
| |
| // TODO: all temporary |
| if (!supported(dst.info()) || !SkBlendMode_AppendStages(*blend)) { |
| return earlyOut(); |
| } |
| |
| bool is_opaque = paintColor->a() == 1.0f, |
| is_constant = true; |
| |
| if (shader) { |
| if (!shader->appendStages(pipeline, dst.colorSpace(), &blitter->fScratchFallback, |
| ctm, paint)) { |
| return earlyOut(); |
| } |
| if (!is_opaque) { |
| pipeline->append(SkRasterPipeline::scale_constant_float, |
| &paintColor->fVec[SkPM4f::A]); |
| } |
| |
| is_opaque = is_opaque && shader->isOpaque(); |
| is_constant = shader->isConstant(); |
| } else { |
| pipeline->append(SkRasterPipeline::constant_color, paintColor); |
| } |
| |
| if (colorFilter) { |
| if (!colorFilter->appendStages(pipeline, dst.colorSpace(), &blitter->fScratchFallback, |
| is_opaque)) { |
| return earlyOut(); |
| } |
| is_opaque = is_opaque && (colorFilter->getFlags() & SkColorFilter::kAlphaUnchanged_Flag); |
| } |
| |
| if (is_constant) { |
| pipeline->append(SkRasterPipeline::store_f32, &paintColor); |
| pipeline->compile()(0,0, 1); |
| |
| *pipeline = SkRasterPipeline(); |
| pipeline->append(SkRasterPipeline::constant_color, paintColor); |
| |
| is_opaque = paintColor->a() == 1.0f; |
| } |
| |
| if (is_opaque && *blend == SkBlendMode::kSrcOver) { |
| *blend = SkBlendMode::kSrc; |
| } |
| |
| return blitter; |
| } |
| |
| void SkRasterPipelineBlitter::append_load_d(SkRasterPipeline* p) const { |
| SkASSERT(supported(fDst.info())); |
| |
| switch (fDst.info().colorType()) { |
| case kRGB_565_SkColorType: p->append(SkRasterPipeline::load_565_d, &fDstPtr); break; |
| case kBGRA_8888_SkColorType: |
| case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::load_8888_d, &fDstPtr); break; |
| case kRGBA_F16_SkColorType: p->append(SkRasterPipeline::load_f16_d, &fDstPtr); break; |
| default: break; |
| } |
| if (fDst.info().colorType() == kBGRA_8888_SkColorType) { |
| p->append(SkRasterPipeline::swap_rb_d); |
| } |
| if (fDst.info().gammaCloseToSRGB()) { |
| p->append(SkRasterPipeline::from_srgb_d); |
| } |
| } |
| |
| void SkRasterPipelineBlitter::append_store(SkRasterPipeline* p) const { |
| SkASSERT(supported(fDst.info())); |
| |
| if (fDst.info().gammaCloseToSRGB()) { |
| p->append(SkRasterPipeline::to_srgb); |
| } |
| if (fDst.info().colorType() == kBGRA_8888_SkColorType) { |
| p->append(SkRasterPipeline::swap_rb); |
| } |
| switch (fDst.info().colorType()) { |
| case kRGB_565_SkColorType: p->append(SkRasterPipeline::store_565, &fDstPtr); break; |
| case kBGRA_8888_SkColorType: |
| case kRGBA_8888_SkColorType: p->append(SkRasterPipeline::store_8888, &fDstPtr); break; |
| case kRGBA_F16_SkColorType: p->append(SkRasterPipeline::store_f16, &fDstPtr); break; |
| default: break; |
| } |
| } |
| |
| void SkRasterPipelineBlitter::append_blend(SkRasterPipeline* p) const { |
| SkAssertResult(SkBlendMode_AppendStages(fBlend, p)); |
| } |
| |
| void SkRasterPipelineBlitter::maybe_clamp(SkRasterPipeline* p) const { |
| if (SkBlendMode_CanOverflow(fBlend)) { |
| p->append(SkRasterPipeline::clamp_a); |
| } |
| } |
| |
| void SkRasterPipelineBlitter::blitH(int x, int y, int w) { |
| if (!fBlitH) { |
| SkRasterPipeline p; |
| p.extend(fShader); |
| if (fBlend != SkBlendMode::kSrc) { |
| this->append_load_d(&p); |
| this->append_blend(&p); |
| this->maybe_clamp(&p); |
| } |
| this->append_store(&p); |
| fBlitH = p.compile(); |
| } |
| |
| fDstPtr = fDst.writable_addr(0,y); |
| fBlitH(x,y, w); |
| } |
| |
| void SkRasterPipelineBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const int16_t runs[]) { |
| if (!fBlitAntiH) { |
| SkRasterPipeline p; |
| p.extend(fShader); |
| if (fBlend == SkBlendMode::kSrcOver) { |
| p.append(SkRasterPipeline::scale_constant_float, &fConstantCoverage); |
| this->append_load_d(&p); |
| this->append_blend(&p); |
| } else { |
| this->append_load_d(&p); |
| this->append_blend(&p); |
| p.append(SkRasterPipeline::lerp_constant_float, &fConstantCoverage); |
| } |
| this->maybe_clamp(&p); |
| this->append_store(&p); |
| fBlitAntiH = p.compile(); |
| } |
| |
| fDstPtr = fDst.writable_addr(0,y); |
| for (int16_t run = *runs; run > 0; run = *runs) { |
| switch (*aa) { |
| case 0x00: break; |
| case 0xff: this->blitH(x,y,run); break; |
| default: |
| fConstantCoverage = *aa * (1/255.0f); |
| fBlitAntiH(x,y, run); |
| } |
| x += run; |
| runs += run; |
| aa += run; |
| } |
| } |
| |
| void SkRasterPipelineBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { |
| if (mask.fFormat == SkMask::kBW_Format) { |
| // TODO: native BW masks? |
| return INHERITED::blitMask(mask, clip); |
| } |
| |
| if (mask.fFormat == SkMask::kA8_Format && !fBlitMaskA8) { |
| SkRasterPipeline p; |
| p.extend(fShader); |
| if (fBlend == SkBlendMode::kSrcOver) { |
| p.append(SkRasterPipeline::scale_u8, &fMaskPtr); |
| this->append_load_d(&p); |
| this->append_blend(&p); |
| } else { |
| this->append_load_d(&p); |
| this->append_blend(&p); |
| p.append(SkRasterPipeline::lerp_u8, &fMaskPtr); |
| } |
| this->maybe_clamp(&p); |
| this->append_store(&p); |
| fBlitMaskA8 = p.compile(); |
| } |
| |
| if (mask.fFormat == SkMask::kLCD16_Format && !fBlitMaskLCD16) { |
| SkRasterPipeline p; |
| p.extend(fShader); |
| this->append_load_d(&p); |
| this->append_blend(&p); |
| p.append(SkRasterPipeline::lerp_565, &fMaskPtr); |
| this->maybe_clamp(&p); |
| this->append_store(&p); |
| fBlitMaskLCD16 = p.compile(); |
| } |
| |
| int x = clip.left(); |
| for (int y = clip.top(); y < clip.bottom(); y++) { |
| fDstPtr = fDst.writable_addr(0,y); |
| |
| switch (mask.fFormat) { |
| case SkMask::kA8_Format: |
| fMaskPtr = mask.getAddr8(x,y)-x; |
| fBlitMaskA8(x,y, clip.width()); |
| break; |
| case SkMask::kLCD16_Format: |
| fMaskPtr = mask.getAddrLCD16(x,y)-x; |
| fBlitMaskLCD16(x,y, clip.width()); |
| break; |
| default: |
| // TODO |
| break; |
| } |
| } |
| } |