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/*
* 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::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"
std::unique_ptr<GrFragmentProcessor> SkColorShader::asFragmentProcessor(
const GrFPArgs& args) const {
GrColor4f color = SkColorToPremulGrColor4f(fColor, *args.fDstColorSpaceInfo);
return GrConstColorProcessor::Make(color, GrConstColorProcessor::InputMode::kModulateA);
}
#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::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 "GrColorSpaceInfo.h"
#include "GrColorSpaceXform.h"
#include "SkGr.h"
#include "effects/GrConstColorProcessor.h"
std::unique_ptr<GrFragmentProcessor> SkColor4Shader::asFragmentProcessor(
const GrFPArgs& args) const {
auto xform = GrColorSpaceXform::MakeUnpremulToUnpremul(fColorSpace.get(),
args.fDstColorSpaceInfo->colorSpace());
GrColor4f color = GrColor4f::FromSkColor4f(fColor4);
if (xform) {
color = xform->apply(color);
}
return GrConstColorProcessor::Make(color.premul(),
GrConstColorProcessor::InputMode::kModulateA);
}
#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(const StageRec& rec) const {
rec.fPipeline->append_constant_color(rec.fAlloc,
premul_in_dst_colorspace(fColor, rec.fDstCS));
return true;
}
bool SkColor4Shader::onAppendStages(const StageRec& rec) const {
rec.fPipeline->append_constant_color(rec.fAlloc,
premul_in_dst_colorspace(fColor4, fColorSpace.get(), rec.fDstCS));
return true;
}
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