1/* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8#include "SkArenaAlloc.h" 9#include "SkColorShader.h" 10#include "SkColorSpace.h" 11#include "SkPM4fPriv.h" 12#include "SkRasterPipeline.h" 13#include "SkReadBuffer.h" 14#include "SkUtils.h" 15 16SkColorShader::SkColorShader(SkColor c) : fColor(c) {} 17 18bool SkColorShader::isOpaque() const { 19 return SkColorGetA(fColor) == 255; 20} 21 22sk_sp<SkFlattenable> SkColorShader::CreateProc(SkReadBuffer& buffer) { 23 return sk_make_sp<SkColorShader>(buffer.readColor()); 24} 25 26void SkColorShader::flatten(SkWriteBuffer& buffer) const { 27 buffer.writeColor(fColor); 28} 29 30uint32_t SkColorShader::ColorShaderContext::getFlags() const { 31 return fFlags; 32} 33 34SkShaderBase::Context* SkColorShader::onMakeContext(const ContextRec& rec, 35 SkArenaAlloc* alloc) const { 36 return alloc->make<ColorShaderContext>(*this, rec); 37} 38 39SkColorShader::ColorShaderContext::ColorShaderContext(const SkColorShader& shader, 40 const ContextRec& rec) 41 : INHERITED(shader, rec) 42{ 43 SkColor color = shader.fColor; 44 unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha())); 45 46 unsigned r = SkColorGetR(color); 47 unsigned g = SkColorGetG(color); 48 unsigned b = SkColorGetB(color); 49 50 if (a != 255) { 51 r = SkMulDiv255Round(r, a); 52 g = SkMulDiv255Round(g, a); 53 b = SkMulDiv255Round(b, a); 54 } 55 fPMColor = SkPackARGB32(a, r, g, b); 56 57 SkColor4f c4 = SkColor4f::FromColor(shader.fColor); 58 c4.fA *= rec.fPaint->getAlpha() / 255.0f; 59 fPM4f = c4.premul(); 60 61 fFlags = kConstInY32_Flag; 62 if (255 == a) { 63 fFlags |= kOpaqueAlpha_Flag; 64 } 65} 66 67void SkColorShader::ColorShaderContext::shadeSpan(int x, int y, SkPMColor span[], int count) { 68 sk_memset32(span, fPMColor, count); 69} 70 71void SkColorShader::ColorShaderContext::shadeSpan4f(int x, int y, SkPM4f span[], int count) { 72 for (int i = 0; i < count; ++i) { 73 span[i] = fPM4f; 74 } 75} 76 77SkShader::GradientType SkColorShader::asAGradient(GradientInfo* info) const { 78 if (info) { 79 if (info->fColors && info->fColorCount >= 1) { 80 info->fColors[0] = fColor; 81 } 82 info->fColorCount = 1; 83 info->fTileMode = SkShader::kRepeat_TileMode; 84 } 85 return kColor_GradientType; 86} 87 88#if SK_SUPPORT_GPU 89 90#include "SkGr.h" 91#include "effects/GrConstColorProcessor.h" 92std::unique_ptr<GrFragmentProcessor> SkColorShader::asFragmentProcessor( 93 const GrFPArgs& args) const { 94 GrColor4f color = SkColorToPremulGrColor4f(fColor, *args.fDstColorSpaceInfo); 95 return GrConstColorProcessor::Make(color, GrConstColorProcessor::InputMode::kModulateA); 96} 97 98#endif 99 100#ifndef SK_IGNORE_TO_STRING 101void SkColorShader::toString(SkString* str) const { 102 str->append("SkColorShader: ("); 103 104 str->append("Color: "); 105 str->appendHex(fColor); 106 107 this->INHERITED::toString(str); 108 109 str->append(")"); 110} 111#endif 112 113/////////////////////////////////////////////////////////////////////////////////////////////////// 114/////////////////////////////////////////////////////////////////////////////////////////////////// 115 116static unsigned unit_to_byte(float unit) { 117 SkASSERT(unit >= 0 && unit <= 1); 118 return (unsigned)(unit * 255 + 0.5); 119} 120 121static SkColor unit_to_skcolor(const SkColor4f& unit, SkColorSpace* cs) { 122 return SkColorSetARGB(unit_to_byte(unit.fA), unit_to_byte(unit.fR), 123 unit_to_byte(unit.fG), unit_to_byte(unit.fB)); 124} 125 126SkColor4Shader::SkColor4Shader(const SkColor4f& color, sk_sp<SkColorSpace> space) 127 : fColorSpace(std::move(space)) 128 , fColor4(color) 129 , fCachedByteColor(unit_to_skcolor(color.pin(), space.get())) 130{} 131 132sk_sp<SkFlattenable> SkColor4Shader::CreateProc(SkReadBuffer& buffer) { 133 SkColor4f color; 134 buffer.readColor4f(&color); 135 if (buffer.readBool()) { 136 // TODO how do we unflatten colorspaces 137 } 138 return SkShader::MakeColorShader(color, nullptr); 139} 140 141void SkColor4Shader::flatten(SkWriteBuffer& buffer) const { 142 buffer.writeColor4f(fColor4); 143 buffer.writeBool(false); // TODO how do we flatten colorspaces? 144} 145 146uint32_t SkColor4Shader::Color4Context::getFlags() const { 147 return fFlags; 148} 149 150SkShaderBase::Context* SkColor4Shader::onMakeContext(const ContextRec& rec, 151 SkArenaAlloc* alloc) const { 152 return alloc->make<Color4Context>(*this, rec); 153} 154 155SkColor4Shader::Color4Context::Color4Context(const SkColor4Shader& shader, 156 const ContextRec& rec) 157: INHERITED(shader, rec) 158{ 159 SkColor color = shader.fCachedByteColor; 160 unsigned a = SkAlphaMul(SkColorGetA(color), SkAlpha255To256(rec.fPaint->getAlpha())); 161 162 unsigned r = SkColorGetR(color); 163 unsigned g = SkColorGetG(color); 164 unsigned b = SkColorGetB(color); 165 166 if (a != 255) { 167 r = SkMulDiv255Round(r, a); 168 g = SkMulDiv255Round(g, a); 169 b = SkMulDiv255Round(b, a); 170 } 171 fPMColor = SkPackARGB32(a, r, g, b); 172 173 SkColor4f c4 = shader.fColor4; 174 c4.fA *= rec.fPaint->getAlpha() * (1 / 255.0f); 175 fPM4f = c4.premul(); 176 177 fFlags = kConstInY32_Flag; 178 if (255 == a) { 179 fFlags |= kOpaqueAlpha_Flag; 180 } 181} 182 183void SkColor4Shader::Color4Context::shadeSpan(int x, int y, SkPMColor span[], int count) { 184 sk_memset32(span, fPMColor, count); 185} 186 187void SkColor4Shader::Color4Context::shadeSpan4f(int x, int y, SkPM4f span[], int count) { 188 for (int i = 0; i < count; ++i) { 189 span[i] = fPM4f; 190 } 191} 192 193// TODO: do we need an updated version of this method for color4+colorspace? 194SkShader::GradientType SkColor4Shader::asAGradient(GradientInfo* info) const { 195 if (info) { 196 if (info->fColors && info->fColorCount >= 1) { 197 info->fColors[0] = fCachedByteColor; 198 } 199 info->fColorCount = 1; 200 info->fTileMode = SkShader::kRepeat_TileMode; 201 } 202 return kColor_GradientType; 203} 204 205#if SK_SUPPORT_GPU 206 207#include "GrColorSpaceInfo.h" 208#include "GrColorSpaceXform.h" 209#include "SkGr.h" 210#include "effects/GrConstColorProcessor.h" 211 212std::unique_ptr<GrFragmentProcessor> SkColor4Shader::asFragmentProcessor( 213 const GrFPArgs& args) const { 214 // Construct an xform assuming float inputs. The color space can have a transfer function on 215 // it, which will be applied below. 216 auto colorSpaceXform = GrColorSpaceXform::Make(fColorSpace.get(), kRGBA_float_GrPixelConfig, 217 args.fDstColorSpaceInfo->colorSpace()); 218 GrColor4f color = GrColor4f::FromSkColor4f(fColor4); 219 if (colorSpaceXform) { 220 color = colorSpaceXform->clampedXform(color); 221 } 222 return GrConstColorProcessor::Make(color.premul(), 223 GrConstColorProcessor::InputMode::kModulateA); 224} 225 226#endif 227 228#ifndef SK_IGNORE_TO_STRING 229void SkColor4Shader::toString(SkString* str) const { 230 str->append("SkColor4Shader: ("); 231 232 str->append("RGBA:"); 233 for (int i = 0; i < 4; ++i) { 234 str->appendf(" %g", fColor4.vec()[i]); 235 } 236 str->append(" )"); 237} 238#endif 239 240sk_sp<SkShader> SkColor4Shader::onMakeColorSpace(SkColorSpaceXformer* xformer) const { 241 return SkShader::MakeColorShader(xformer->apply(fCachedByteColor)); 242} 243 244sk_sp<SkShader> SkShader::MakeColorShader(const SkColor4f& color, sk_sp<SkColorSpace> space) { 245 if (!SkScalarsAreFinite(color.vec(), 4)) { 246 return nullptr; 247 } 248 return sk_make_sp<SkColor4Shader>(color, std::move(space)); 249} 250 251/////////////////////////////////////////////////////////////////////////////////////////////////// 252 253bool SkColorShader::onAppendStages(const StageRec& rec) const { 254 rec.fPipeline->append_constant_color(rec.fAlloc, SkPM4f_from_SkColor(fColor, rec.fDstCS)); 255 return true; 256} 257 258bool SkColor4Shader::onAppendStages(const StageRec& rec) const { 259 rec.fPipeline->append_constant_color( 260 rec.fAlloc, to_colorspace(fColor4, fColorSpace.get(), rec.fDstCS).premul()); 261 return true; 262} 263