| /* |
| * 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 "SkArenaAlloc.h" |
| #include "SkColorShader.h" |
| #include "SkColorSpace.h" |
| #include "SkPM4fPriv.h" |
| #include "SkRasterPipeline.h" |
| #include "SkReadBuffer.h" |
| #include "SkUtils.h" |
| |
| SkColorShader::SkColorShader(SkColor c) : fColor(c) {} |
| |
| bool SkColorShader::isOpaque() const { |
| return SkColorGetA(fColor) == 255; |
| } |
| |
| sk_sp<SkFlattenable> SkColorShader::CreateProc(SkReadBuffer& buffer) { |
| return sk_make_sp<SkColorShader>(buffer.readColor()); |
| } |
| |
| void SkColorShader::flatten(SkWriteBuffer& buffer) const { |
| buffer.writeColor(fColor); |
| } |
| |
| uint32_t SkColorShader::ColorShaderContext::getFlags() const { |
| return fFlags; |
| } |
| |
| SkShaderBase::Context* SkColorShader::onMakeContext(const ContextRec& rec, |
| SkArenaAlloc* alloc) const { |
| return alloc->make<ColorShaderContext>(*this, rec); |
| } |
| |
| SkColorShader::ColorShaderContext::ColorShaderContext(const SkColorShader& shader, |
| const ContextRec& rec) |
| : INHERITED(shader, rec) |
| { |
| SkColor color = shader.fColor; |
| unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha())); |
| |
| unsigned r = SkColorGetR(color); |
| unsigned g = SkColorGetG(color); |
| unsigned b = SkColorGetB(color); |
| |
| if (a != 255) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| fPMColor = SkPackARGB32(a, r, g, b); |
| |
| SkColor4f c4 = SkColor4f::FromColor(shader.fColor); |
| c4.fA *= rec.fPaint->getAlpha() / 255.0f; |
| fPM4f = c4.premul(); |
| |
| fFlags = kConstInY32_Flag; |
| if (255 == a) { |
| fFlags |= kOpaqueAlpha_Flag; |
| } |
| } |
| |
| void SkColorShader::ColorShaderContext::shadeSpan(int x, int y, SkPMColor span[], int count) { |
| sk_memset32(span, fPMColor, count); |
| } |
| |
| void SkColorShader::ColorShaderContext::shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) { |
| memset(alpha, SkGetPackedA32(fPMColor), count); |
| } |
| |
| void SkColorShader::ColorShaderContext::shadeSpan4f(int x, int y, SkPM4f span[], int count) { |
| for (int i = 0; i < count; ++i) { |
| span[i] = fPM4f; |
| } |
| } |
| |
| SkShader::GradientType SkColorShader::asAGradient(GradientInfo* info) const { |
| if (info) { |
| if (info->fColors && info->fColorCount >= 1) { |
| info->fColors[0] = fColor; |
| } |
| info->fColorCount = 1; |
| info->fTileMode = SkShader::kRepeat_TileMode; |
| } |
| return kColor_GradientType; |
| } |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "SkGr.h" |
| #include "effects/GrConstColorProcessor.h" |
| sk_sp<GrFragmentProcessor> SkColorShader::asFragmentProcessor(const AsFPArgs& args) const { |
| GrColor4f color = SkColorToPremulGrColor4f(fColor, args.fDstColorSpace); |
| return GrConstColorProcessor::Make(color, GrConstColorProcessor::kModulateA_InputMode); |
| } |
| |
| #endif |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkColorShader::toString(SkString* str) const { |
| str->append("SkColorShader: ("); |
| |
| str->append("Color: "); |
| str->appendHex(fColor); |
| |
| this->INHERITED::toString(str); |
| |
| str->append(")"); |
| } |
| #endif |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static unsigned unit_to_byte(float unit) { |
| SkASSERT(unit >= 0 && unit <= 1); |
| return (unsigned)(unit * 255 + 0.5); |
| } |
| |
| static SkColor unit_to_skcolor(const SkColor4f& unit, SkColorSpace* cs) { |
| return SkColorSetARGB(unit_to_byte(unit.fA), unit_to_byte(unit.fR), |
| unit_to_byte(unit.fG), unit_to_byte(unit.fB)); |
| } |
| |
| SkColor4Shader::SkColor4Shader(const SkColor4f& color, sk_sp<SkColorSpace> space) |
| : fColorSpace(std::move(space)) |
| , fColor4(color) |
| , fCachedByteColor(unit_to_skcolor(color.pin(), space.get())) |
| {} |
| |
| sk_sp<SkFlattenable> SkColor4Shader::CreateProc(SkReadBuffer& buffer) { |
| SkColor4f color; |
| buffer.readColor4f(&color); |
| if (buffer.readBool()) { |
| // TODO how do we unflatten colorspaces |
| } |
| return SkShader::MakeColorShader(color, nullptr); |
| } |
| |
| void SkColor4Shader::flatten(SkWriteBuffer& buffer) const { |
| buffer.writeColor4f(fColor4); |
| buffer.writeBool(false); // TODO how do we flatten colorspaces? |
| } |
| |
| uint32_t SkColor4Shader::Color4Context::getFlags() const { |
| return fFlags; |
| } |
| |
| SkShaderBase::Context* SkColor4Shader::onMakeContext(const ContextRec& rec, |
| SkArenaAlloc* alloc) const { |
| return alloc->make<Color4Context>(*this, rec); |
| } |
| |
| SkColor4Shader::Color4Context::Color4Context(const SkColor4Shader& shader, |
| const ContextRec& rec) |
| : INHERITED(shader, rec) |
| { |
| SkColor color = shader.fCachedByteColor; |
| unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha())); |
| |
| unsigned r = SkColorGetR(color); |
| unsigned g = SkColorGetG(color); |
| unsigned b = SkColorGetB(color); |
| |
| if (a != 255) { |
| r = SkMulDiv255Round(r, a); |
| g = SkMulDiv255Round(g, a); |
| b = SkMulDiv255Round(b, a); |
| } |
| fPMColor = SkPackARGB32(a, r, g, b); |
| |
| SkColor4f c4 = shader.fColor4; |
| c4.fA *= rec.fPaint->getAlpha() * (1 / 255.0f); |
| fPM4f = c4.premul(); |
| |
| fFlags = kConstInY32_Flag; |
| if (255 == a) { |
| fFlags |= kOpaqueAlpha_Flag; |
| } |
| } |
| |
| void SkColor4Shader::Color4Context::shadeSpan(int x, int y, SkPMColor span[], int count) { |
| sk_memset32(span, fPMColor, count); |
| } |
| |
| void SkColor4Shader::Color4Context::shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) { |
| memset(alpha, SkGetPackedA32(fPMColor), count); |
| } |
| |
| void SkColor4Shader::Color4Context::shadeSpan4f(int x, int y, SkPM4f span[], int count) { |
| for (int i = 0; i < count; ++i) { |
| span[i] = fPM4f; |
| } |
| } |
| |
| // TODO: do we need an updated version of this method for color4+colorspace? |
| SkShader::GradientType SkColor4Shader::asAGradient(GradientInfo* info) const { |
| if (info) { |
| if (info->fColors && info->fColorCount >= 1) { |
| info->fColors[0] = fCachedByteColor; |
| } |
| info->fColorCount = 1; |
| info->fTileMode = SkShader::kRepeat_TileMode; |
| } |
| return kColor_GradientType; |
| } |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "SkGr.h" |
| #include "effects/GrConstColorProcessor.h" |
| #include "GrColorSpaceXform.h" |
| sk_sp<GrFragmentProcessor> SkColor4Shader::asFragmentProcessor(const AsFPArgs& args) const { |
| sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(fColorSpace.get(), |
| args.fDstColorSpace); |
| GrColor4f color = GrColor4f::FromSkColor4f(fColor4); |
| if (colorSpaceXform) { |
| color = colorSpaceXform->apply(color); |
| } |
| return GrConstColorProcessor::Make(color.premul(), GrConstColorProcessor::kModulateA_InputMode); |
| } |
| |
| #endif |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkColor4Shader::toString(SkString* str) const { |
| str->append("SkColor4Shader: ("); |
| |
| str->append("RGBA:"); |
| for (int i = 0; i < 4; ++i) { |
| str->appendf(" %g", fColor4.vec()[i]); |
| } |
| str->append(" )"); |
| } |
| #endif |
| |
| sk_sp<SkShader> SkColor4Shader::onMakeColorSpace(SkColorSpaceXformer* xformer) const { |
| return SkShader::MakeColorShader(xformer->apply(fCachedByteColor)); |
| } |
| |
| sk_sp<SkShader> SkShader::MakeColorShader(const SkColor4f& color, sk_sp<SkColorSpace> space) { |
| if (!SkScalarsAreFinite(color.vec(), 4)) { |
| return nullptr; |
| } |
| return sk_make_sp<SkColor4Shader>(color, std::move(space)); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| bool SkColorShader::onAppendStages(SkRasterPipeline* p, |
| SkColorSpace* dst, |
| SkArenaAlloc* scratch, |
| const SkMatrix&, |
| const SkPaint&, |
| const SkMatrix*) const { |
| p->append_uniform_color(scratch, SkPM4f_from_SkColor(fColor, dst)); |
| return true; |
| } |
| |
| bool SkColor4Shader::onAppendStages(SkRasterPipeline* p, |
| SkColorSpace* dst, |
| SkArenaAlloc* scratch, |
| const SkMatrix&, |
| const SkPaint&, |
| const SkMatrix*) const { |
| p->append_uniform_color(scratch, to_colorspace(fColor4, fColorSpace.get(), dst).premul()); |
| return true; |
| } |
