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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(SkReadBuffer& buffer)
: INHERITED(buffer) {
fShader = buffer.readShader();
fFilter = buffer.readColorFilter();
}
SkFilterShader::~SkFilterShader() {
fFilter->unref();
fShader->unref();
}
void SkFilterShader::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
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();
// if the filter doesn't support 16bit, clear the matching bit in the shader
if (!(filterF & SkColorFilter::kHasFilter16_Flag)) {
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 | SkShader::kHasSpan16_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);
SkASSERT(shaderContext);
return SkNEW_PLACEMENT_ARGS(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);
}
void SkFilterShader::FilterShaderContext::shadeSpan16(int x, int y, uint16_t result[], int count) {
const SkFilterShader& filterShader = static_cast<const SkFilterShader&>(fShader);
SkASSERT(fShaderContext->getFlags() & SkShader::kHasSpan16_Flag);
SkASSERT(filterShader.fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag);
fShaderContext->shadeSpan16(x, y, result, count);
filterShader.fFilter->filterSpan16(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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