| /* |
| * 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 "include/core/SkColor.h" |
| #include "include/core/SkColorFilter.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkShader.h" |
| #include "include/private/SkTo.h" |
| #include "src/core/SkArenaAlloc.h" |
| #include "src/core/SkBlendModePriv.h" |
| #include "src/core/SkBlitter.h" |
| #include "src/core/SkColorSpacePriv.h" |
| #include "src/core/SkColorSpaceXformSteps.h" |
| #include "src/core/SkOpts.h" |
| #include "src/core/SkRasterPipeline.h" |
| #include "src/core/SkUtils.h" |
| #include "src/shaders/SkShaderBase.h" |
| |
| class SkRasterPipelineBlitter final : public SkBlitter { |
| public: |
| // This is our common entrypoint for creating the blitter once we've sorted out shaders. |
| static SkBlitter* Create(const SkPixmap&, const SkPaint&, SkArenaAlloc*, |
| const SkRasterPipeline& shaderPipeline, |
| bool is_opaque, bool is_constant); |
| |
| SkRasterPipelineBlitter(SkPixmap dst, |
| SkBlendMode blend, |
| SkArenaAlloc* alloc) |
| : fDst(dst) |
| , fBlend(blend) |
| , fAlloc(alloc) |
| , fColorPipeline(alloc) |
| {} |
| |
| void blitH (int x, int y, int w) override; |
| void blitAntiH (int x, int y, const SkAlpha[], const int16_t[]) override; |
| void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override; |
| void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override; |
| void blitMask (const SkMask&, const SkIRect& clip) override; |
| void blitRect (int x, int y, int width, int height) override; |
| void blitV (int x, int y, int height, SkAlpha alpha) override; |
| |
| private: |
| void append_load_dst (SkRasterPipeline*) const; |
| void append_store (SkRasterPipeline*) const; |
| |
| SkPixmap fDst; |
| SkBlendMode fBlend; |
| SkArenaAlloc* fAlloc; |
| SkRasterPipeline fColorPipeline; |
| |
| SkRasterPipeline_MemoryCtx |
| fDstPtr = {nullptr,0}, // Always points to the top-left of fDst. |
| fMaskPtr = {nullptr,0}; // Updated each call to blitMask(). |
| SkRasterPipeline_EmbossCtx fEmbossCtx; // Used only for k3D_Format masks. |
| |
| // We may be able to specialize blitH() or blitRect() into a memset. |
| void (*fMemset2D)(SkPixmap*, int x,int y, int w,int h, uint64_t color) = nullptr; |
| uint64_t fMemsetColor = 0; // Big enough for largest memsettable dst format, F16. |
| |
| // Built lazily on first use. |
| std::function<void(size_t, size_t, size_t, size_t)> fBlitRect, |
| fBlitAntiH, |
| fBlitMaskA8, |
| fBlitMaskLCD16, |
| fBlitMask3D; |
| |
| // These values are pointed to by the blit pipelines above, |
| // which allows us to adjust them from call to call. |
| float fCurrentCoverage = 0.0f; |
| float fDitherRate = 0.0f; |
| |
| typedef SkBlitter INHERITED; |
| }; |
| |
| SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst, |
| const SkPaint& paint, |
| const SkMatrix& ctm, |
| SkArenaAlloc* alloc) { |
| // For legacy to keep working, we need to sometimes still distinguish null dstCS from sRGB. |
| #if 0 |
| SkColorSpace* dstCS = dst.colorSpace() ? dst.colorSpace() |
| : sk_srgb_singleton(); |
| #else |
| SkColorSpace* dstCS = dst.colorSpace(); |
| #endif |
| SkColorType dstCT = dst.colorType(); |
| SkColor4f paintColor = paint.getColor4f(); |
| SkColorSpaceXformSteps(sk_srgb_singleton(), kUnpremul_SkAlphaType, |
| dstCS, kUnpremul_SkAlphaType).apply(paintColor.vec()); |
| |
| auto shader = as_SB(paint.getShader()); |
| |
| SkRasterPipeline_<256> shaderPipeline; |
| if (!shader) { |
| // Having no shader makes things nice and easy... just use the paint color. |
| shaderPipeline.append_constant_color(alloc, paintColor.premul().vec()); |
| bool is_opaque = paintColor.fA == 1.0f, |
| is_constant = true; |
| return SkRasterPipelineBlitter::Create(dst, paint, alloc, |
| shaderPipeline, is_opaque, is_constant); |
| } |
| |
| bool is_opaque = shader->isOpaque() && paintColor.fA == 1.0f; |
| bool is_constant = shader->isConstant(); |
| |
| if (shader->appendStages({&shaderPipeline, alloc, dstCT, dstCS, paint, nullptr, ctm})) { |
| if (paintColor.fA != 1.0f) { |
| shaderPipeline.append(SkRasterPipeline::scale_1_float, |
| alloc->make<float>(paintColor.fA)); |
| } |
| return SkRasterPipelineBlitter::Create(dst, paint, alloc, |
| shaderPipeline, is_opaque, is_constant); |
| } |
| |
| // The shader has opted out of drawing anything. |
| return alloc->make<SkNullBlitter>(); |
| } |
| |
| SkBlitter* SkCreateRasterPipelineBlitter(const SkPixmap& dst, |
| const SkPaint& paint, |
| const SkRasterPipeline& shaderPipeline, |
| bool is_opaque, |
| SkArenaAlloc* alloc) { |
| bool is_constant = false; // If this were the case, it'd be better to just set a paint color. |
| return SkRasterPipelineBlitter::Create(dst, paint, alloc, |
| shaderPipeline, is_opaque, is_constant); |
| } |
| |
| SkBlitter* SkRasterPipelineBlitter::Create(const SkPixmap& dst, |
| const SkPaint& paint, |
| SkArenaAlloc* alloc, |
| const SkRasterPipeline& shaderPipeline, |
| bool is_opaque, |
| bool is_constant) { |
| auto blitter = alloc->make<SkRasterPipelineBlitter>(dst, |
| paint.getBlendMode(), |
| alloc); |
| |
| // Our job in this factory is to fill out the blitter's color pipeline. |
| // This is the common front of the full blit pipelines, each constructed lazily on first use. |
| // The full blit pipelines handle reading and writing the dst, blending, coverage, dithering. |
| auto colorPipeline = &blitter->fColorPipeline; |
| |
| // Let's get the shader in first. |
| colorPipeline->extend(shaderPipeline); |
| |
| // If there's a color filter it comes next. |
| if (auto colorFilter = paint.getColorFilter()) { |
| SkStageRec rec = { |
| colorPipeline, alloc, dst.colorType(), dst.colorSpace(), paint, nullptr, SkMatrix::I() |
| }; |
| colorFilter->appendStages(rec, is_opaque); |
| is_opaque = is_opaque && (colorFilter->getFlags() & SkColorFilter::kAlphaUnchanged_Flag); |
| } |
| |
| // Not all formats make sense to dither (think, F16). We set their dither rate |
| // to zero. We need to decide if we're going to dither now to keep is_constant accurate. |
| if (paint.isDither()) { |
| switch (dst.info().colorType()) { |
| default: blitter->fDitherRate = 0.0f; break; |
| case kARGB_4444_SkColorType: blitter->fDitherRate = 1/15.0f; break; |
| case kRGB_565_SkColorType: blitter->fDitherRate = 1/63.0f; break; |
| case kGray_8_SkColorType: |
| case kRGB_888x_SkColorType: |
| case kRGBA_8888_SkColorType: |
| case kBGRA_8888_SkColorType: blitter->fDitherRate = 1/255.0f; break; |
| case kRGB_101010x_SkColorType: |
| case kRGBA_1010102_SkColorType: blitter->fDitherRate = 1/1023.0f; break; |
| } |
| // TODO: for constant colors, we could try to measure the effect of dithering, and if |
| // it has no value (i.e. all variations result in the same 32bit color, then we |
| // could disable it (for speed, by not adding the stage). |
| } |
| is_constant = is_constant && (blitter->fDitherRate == 0.0f); |
| |
| // We're logically done here. The code between here and return blitter is all optimization. |
| |
| // A pipeline that's still constant here can collapse back into a constant color. |
| if (is_constant) { |
| SkColor4f constantColor; |
| SkRasterPipeline_MemoryCtx constantColorPtr = { &constantColor, 0 }; |
| colorPipeline->append_gamut_clamp_if_normalized(dst.info()); |
| colorPipeline->append(SkRasterPipeline::store_f32, &constantColorPtr); |
| colorPipeline->run(0,0,1,1); |
| colorPipeline->reset(); |
| colorPipeline->append_constant_color(alloc, constantColor); |
| |
| is_opaque = constantColor.fA == 1.0f; |
| } |
| |
| // We can strength-reduce SrcOver into Src when opaque. |
| if (is_opaque && blitter->fBlend == SkBlendMode::kSrcOver) { |
| blitter->fBlend = SkBlendMode::kSrc; |
| } |
| |
| // When we're drawing a constant color in Src mode, we can sometimes just memset. |
| // (The previous two optimizations help find more opportunities for this one.) |
| if (is_constant && blitter->fBlend == SkBlendMode::kSrc) { |
| // Run our color pipeline all the way through to produce what we'd memset when we can. |
| // Not all blits can memset, so we need to keep colorPipeline too. |
| SkRasterPipeline_<256> p; |
| p.extend(*colorPipeline); |
| p.append_gamut_clamp_if_normalized(dst.info()); |
| blitter->fDstPtr = SkRasterPipeline_MemoryCtx{&blitter->fMemsetColor, 0}; |
| blitter->append_store(&p); |
| p.run(0,0,1,1); |
| |
| switch (blitter->fDst.shiftPerPixel()) { |
| case 0: blitter->fMemset2D = [](SkPixmap* dst, int x,int y, int w,int h, uint64_t c) { |
| void* p = dst->writable_addr(x,y); |
| while (h --> 0) { |
| memset(p, c, w); |
| p = SkTAddOffset<void>(p, dst->rowBytes()); |
| } |
| }; break; |
| |
| case 1: blitter->fMemset2D = [](SkPixmap* dst, int x,int y, int w,int h, uint64_t c) { |
| SkOpts::rect_memset16(dst->writable_addr16(x,y), c, w, dst->rowBytes(), h); |
| }; break; |
| |
| case 2: blitter->fMemset2D = [](SkPixmap* dst, int x,int y, int w,int h, uint64_t c) { |
| SkOpts::rect_memset32(dst->writable_addr32(x,y), c, w, dst->rowBytes(), h); |
| }; break; |
| |
| case 3: blitter->fMemset2D = [](SkPixmap* dst, int x,int y, int w,int h, uint64_t c) { |
| SkOpts::rect_memset64(dst->writable_addr64(x,y), c, w, dst->rowBytes(), h); |
| }; break; |
| |
| // TODO(F32)? |
| } |
| } |
| |
| blitter->fDstPtr = SkRasterPipeline_MemoryCtx{ |
| blitter->fDst.writable_addr(), |
| blitter->fDst.rowBytesAsPixels(), |
| }; |
| |
| return blitter; |
| } |
| |
| void SkRasterPipelineBlitter::append_load_dst(SkRasterPipeline* p) const { |
| p->append_load_dst(fDst.info().colorType(), &fDstPtr); |
| if (fDst.info().alphaType() == kUnpremul_SkAlphaType) { |
| p->append(SkRasterPipeline::premul_dst); |
| } |
| } |
| |
| void SkRasterPipelineBlitter::append_store(SkRasterPipeline* p) const { |
| if (fDst.info().alphaType() == kUnpremul_SkAlphaType) { |
| p->append(SkRasterPipeline::unpremul); |
| } |
| if (fDitherRate > 0.0f) { |
| p->append(SkRasterPipeline::dither, &fDitherRate); |
| } |
| |
| p->append_store(fDst.info().colorType(), &fDstPtr); |
| } |
| |
| void SkRasterPipelineBlitter::blitH(int x, int y, int w) { |
| this->blitRect(x,y,w,1); |
| } |
| |
| void SkRasterPipelineBlitter::blitRect(int x, int y, int w, int h) { |
| if (fMemset2D) { |
| fMemset2D(&fDst, x,y, w,h, fMemsetColor); |
| return; |
| } |
| |
| if (!fBlitRect) { |
| SkRasterPipeline p(fAlloc); |
| p.extend(fColorPipeline); |
| p.append_gamut_clamp_if_normalized(fDst.info()); |
| if (fBlend == SkBlendMode::kSrcOver |
| && (fDst.info().colorType() == kRGBA_8888_SkColorType || |
| fDst.info().colorType() == kBGRA_8888_SkColorType) |
| && !fDst.colorSpace() |
| && fDst.info().alphaType() != kUnpremul_SkAlphaType |
| && fDitherRate == 0.0f) { |
| if (fDst.info().colorType() == kBGRA_8888_SkColorType) { |
| p.append(SkRasterPipeline::swap_rb); |
| } |
| p.append(SkRasterPipeline::srcover_rgba_8888, &fDstPtr); |
| } else { |
| if (fBlend != SkBlendMode::kSrc) { |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| } |
| this->append_store(&p); |
| } |
| fBlitRect = p.compile(); |
| } |
| |
| fBlitRect(x,y,w,h); |
| } |
| |
| void SkRasterPipelineBlitter::blitAntiH(int x, int y, const SkAlpha aa[], const int16_t runs[]) { |
| if (!fBlitAntiH) { |
| SkRasterPipeline p(fAlloc); |
| p.extend(fColorPipeline); |
| p.append_gamut_clamp_if_normalized(fDst.info()); |
| if (SkBlendMode_ShouldPreScaleCoverage(fBlend, /*rgb_coverage=*/false)) { |
| p.append(SkRasterPipeline::scale_1_float, &fCurrentCoverage); |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| } else { |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| p.append(SkRasterPipeline::lerp_1_float, &fCurrentCoverage); |
| } |
| |
| this->append_store(&p); |
| fBlitAntiH = p.compile(); |
| } |
| |
| for (int16_t run = *runs; run > 0; run = *runs) { |
| switch (*aa) { |
| case 0x00: break; |
| case 0xff: this->blitH(x,y,run); break; |
| default: |
| fCurrentCoverage = *aa * (1/255.0f); |
| fBlitAntiH(x,y,run,1); |
| } |
| x += run; |
| runs += run; |
| aa += run; |
| } |
| } |
| |
| void SkRasterPipelineBlitter::blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) { |
| SkIRect clip = {x,y, x+2,y+1}; |
| uint8_t coverage[] = { (uint8_t)a0, (uint8_t)a1 }; |
| |
| SkMask mask; |
| mask.fImage = coverage; |
| mask.fBounds = clip; |
| mask.fRowBytes = 2; |
| mask.fFormat = SkMask::kA8_Format; |
| |
| this->blitMask(mask, clip); |
| } |
| |
| void SkRasterPipelineBlitter::blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) { |
| SkIRect clip = {x,y, x+1,y+2}; |
| uint8_t coverage[] = { (uint8_t)a0, (uint8_t)a1 }; |
| |
| SkMask mask; |
| mask.fImage = coverage; |
| mask.fBounds = clip; |
| mask.fRowBytes = 1; |
| mask.fFormat = SkMask::kA8_Format; |
| |
| this->blitMask(mask, clip); |
| } |
| |
| void SkRasterPipelineBlitter::blitV(int x, int y, int height, SkAlpha alpha) { |
| SkIRect clip = {x,y, x+1,y+height}; |
| |
| SkMask mask; |
| mask.fImage = α |
| mask.fBounds = clip; |
| mask.fRowBytes = 0; // so we reuse the 1 "row" for all of height |
| mask.fFormat = SkMask::kA8_Format; |
| |
| this->blitMask(mask, clip); |
| } |
| |
| void SkRasterPipelineBlitter::blitMask(const SkMask& mask, const SkIRect& clip) { |
| if (mask.fFormat == SkMask::kBW_Format) { |
| // TODO: native BW masks? |
| return INHERITED::blitMask(mask, clip); |
| } |
| |
| // ARGB and SDF masks shouldn't make it here. |
| SkASSERT(mask.fFormat == SkMask::kA8_Format |
| || mask.fFormat == SkMask::kLCD16_Format |
| || mask.fFormat == SkMask::k3D_Format); |
| |
| auto extract_mask_plane = [&mask](int plane, SkRasterPipeline_MemoryCtx* ctx) { |
| // LCD is 16-bit per pixel; A8 and 3D are 8-bit per pixel. |
| size_t bpp = mask.fFormat == SkMask::kLCD16_Format ? 2 : 1; |
| |
| // Select the right mask plane. Usually plane == 0 and this is just mask.fImage. |
| auto ptr = (uintptr_t)mask.fImage |
| + plane * mask.computeImageSize(); |
| |
| // Update ctx to point "into" this current mask, but lined up with fDstPtr at (0,0). |
| // This sort of trickery upsets UBSAN (pointer-overflow) so our ptr must be a uintptr_t. |
| // mask.fRowBytes is a uint32_t, which would break our addressing math on 64-bit builds. |
| size_t rowBytes = mask.fRowBytes; |
| ctx->stride = rowBytes / bpp; |
| ctx->pixels = (void*)(ptr - mask.fBounds.left() * bpp |
| - mask.fBounds.top() * rowBytes); |
| }; |
| |
| extract_mask_plane(0, &fMaskPtr); |
| if (mask.fFormat == SkMask::k3D_Format) { |
| extract_mask_plane(1, &fEmbossCtx.mul); |
| extract_mask_plane(2, &fEmbossCtx.add); |
| } |
| |
| // Lazily build whichever pipeline we need, specialized for each mask format. |
| if (mask.fFormat == SkMask::kA8_Format && !fBlitMaskA8) { |
| SkRasterPipeline p(fAlloc); |
| p.extend(fColorPipeline); |
| p.append_gamut_clamp_if_normalized(fDst.info()); |
| if (SkBlendMode_ShouldPreScaleCoverage(fBlend, /*rgb_coverage=*/false)) { |
| p.append(SkRasterPipeline::scale_u8, &fMaskPtr); |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| } else { |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| p.append(SkRasterPipeline::lerp_u8, &fMaskPtr); |
| } |
| this->append_store(&p); |
| fBlitMaskA8 = p.compile(); |
| } |
| if (mask.fFormat == SkMask::kLCD16_Format && !fBlitMaskLCD16) { |
| SkRasterPipeline p(fAlloc); |
| p.extend(fColorPipeline); |
| p.append_gamut_clamp_if_normalized(fDst.info()); |
| if (SkBlendMode_ShouldPreScaleCoverage(fBlend, /*rgb_coverage=*/true)) { |
| // Somewhat unusually, scale_565 needs dst loaded first. |
| this->append_load_dst(&p); |
| p.append(SkRasterPipeline::scale_565, &fMaskPtr); |
| SkBlendMode_AppendStages(fBlend, &p); |
| } else { |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| p.append(SkRasterPipeline::lerp_565, &fMaskPtr); |
| } |
| this->append_store(&p); |
| fBlitMaskLCD16 = p.compile(); |
| } |
| if (mask.fFormat == SkMask::k3D_Format && !fBlitMask3D) { |
| SkRasterPipeline p(fAlloc); |
| p.extend(fColorPipeline); |
| // This bit is where we differ from kA8_Format: |
| p.append(SkRasterPipeline::emboss, &fEmbossCtx); |
| // Now onward just as kA8. |
| p.append_gamut_clamp_if_normalized(fDst.info()); |
| if (SkBlendMode_ShouldPreScaleCoverage(fBlend, /*rgb_coverage=*/false)) { |
| p.append(SkRasterPipeline::scale_u8, &fMaskPtr); |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| } else { |
| this->append_load_dst(&p); |
| SkBlendMode_AppendStages(fBlend, &p); |
| p.append(SkRasterPipeline::lerp_u8, &fMaskPtr); |
| } |
| this->append_store(&p); |
| fBlitMask3D = p.compile(); |
| } |
| |
| std::function<void(size_t,size_t,size_t,size_t)>* blitter = nullptr; |
| switch (mask.fFormat) { |
| case SkMask::kA8_Format: blitter = &fBlitMaskA8; break; |
| case SkMask::kLCD16_Format: blitter = &fBlitMaskLCD16; break; |
| case SkMask::k3D_Format: blitter = &fBlitMask3D; break; |
| default: |
| SkASSERT(false); |
| return; |
| } |
| |
| SkASSERT(blitter); |
| (*blitter)(clip.left(),clip.top(), clip.width(),clip.height()); |
| } |
