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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkFilterShader.h"
#include "SkColorFilter.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkShader.h"
#include "SkString.h"
SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) {
fShader = shader;
shader->ref();
fFilter = filter;
filter->ref();
}
SkFilterShader::~SkFilterShader() {
fFilter->unref();
fShader->unref();
}
SkFlattenable* SkFilterShader::CreateProc(SkReadBuffer& buffer) {
SkAutoTUnref<SkShader> shader(buffer.readShader());
SkAutoTUnref<SkColorFilter> filter(buffer.readColorFilter());
if (!shader.get() || !filter.get()) {
return nullptr;
}
return new SkFilterShader(shader, filter);
}
void SkFilterShader::flatten(SkWriteBuffer& buffer) const {
buffer.writeFlattenable(fShader);
buffer.writeFlattenable(fFilter);
}
uint32_t SkFilterShader::FilterShaderContext::getFlags() const {
const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
uint32_t shaderF = fShaderContext->getFlags();
uint32_t filterF = filterShader.fFilter->getFlags();
// filters don't support 16bit, so clear the matching bit in the shader
shaderF &= ~SkShader::kHasSpan16_Flag;
// if the filter might change alpha, clear the opaque flag in the shader
if (!(filterF & SkColorFilter::kAlphaUnchanged_Flag)) {
shaderF &= ~SkShader::kOpaqueAlpha_Flag;
}
return shaderF;
}
SkShader::Context* SkFilterShader::onCreateContext(const ContextRec& rec, void* storage) const {
char* shaderContextStorage = (char*)storage + sizeof(FilterShaderContext);
SkShader::Context* shaderContext = fShader->createContext(rec, shaderContextStorage);
if (nullptr == shaderContext) {
return nullptr;
}
return new (storage) FilterShaderContext(*this, shaderContext, rec);
}
size_t SkFilterShader::contextSize() const {
return sizeof(FilterShaderContext) + fShader->contextSize();
}
SkFilterShader::FilterShaderContext::FilterShaderContext(const SkFilterShader& filterShader,
SkShader::Context* shaderContext,
const ContextRec& rec)
: INHERITED(filterShader, rec)
, fShaderContext(shaderContext) {}
SkFilterShader::FilterShaderContext::~FilterShaderContext() {
fShaderContext->~Context();
}
void SkFilterShader::FilterShaderContext::shadeSpan(int x, int y, SkPMColor result[], int count) {
const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
fShaderContext->shadeSpan(x, y, result, count);
filterShader.fFilter->filterSpan(result, count, result);
}
#ifndef SK_IGNORE_TO_STRING
void SkFilterShader::toString(SkString* str) const {
str->append("SkFilterShader: (");
str->append("Shader: ");
fShader->toString(str);
str->append(" Filter: ");
// TODO: add "fFilter->toString(str);" once SkColorFilter::toString is added
this->INHERITED::toString(str);
str->append(")");
}
#endif
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