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/* libs/graphics/sgl/SkColorFilter.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkColorFilter.h"
#include "SkShader.h"
#include "SkUnPreMultiply.h"
bool SkColorFilter::asColorMode(SkColor* color, SkXfermode::Mode* mode) {
return false;
}
void SkColorFilter::filterSpan16(const uint16_t s[], int count, uint16_t d[]) {
SkASSERT(this->getFlags() & SkColorFilter::kHasFilter16_Flag);
SkASSERT(!"missing implementation of SkColorFilter::filterSpan16");
if (d != s) {
memcpy(d, s, count * sizeof(uint16_t));
}
}
SkColor SkColorFilter::filterColor(SkColor c) {
SkPMColor dst, src = SkPreMultiplyColor(c);
this->filterSpan(&src, 1, &dst);
return SkUnPreMultiply::PMColorToColor(dst);
}
///////////////////////////////////////////////////////////////////////////////
SkFilterShader::SkFilterShader(SkShader* shader, SkColorFilter* filter) {
fShader = shader; shader->ref();
fFilter = filter; filter->ref();
}
SkFilterShader::SkFilterShader(SkFlattenableReadBuffer& buffer) :
INHERITED(buffer) {
fShader = static_cast<SkShader*>(buffer.readFlattenable());
fFilter = static_cast<SkColorFilter*>(buffer.readFlattenable());
}
SkFilterShader::~SkFilterShader() {
fFilter->unref();
fShader->unref();
}
void SkFilterShader::beginSession() {
this->INHERITED::beginSession();
fShader->beginSession();
}
void SkFilterShader::endSession() {
fShader->endSession();
this->INHERITED::endSession();
}
void SkFilterShader::flatten(SkFlattenableWriteBuffer& buffer) {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fShader);
buffer.writeFlattenable(fFilter);
}
uint32_t SkFilterShader::getFlags() {
uint32_t shaderF = fShader->getFlags();
uint32_t filterF = 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;
}
bool SkFilterShader::setContext(const SkBitmap& device,
const SkPaint& paint,
const SkMatrix& matrix) {
return this->INHERITED::setContext(device, paint, matrix) &&
fShader->setContext(device, paint, matrix);
}
void SkFilterShader::shadeSpan(int x, int y, SkPMColor result[], int count) {
fShader->shadeSpan(x, y, result, count);
fFilter->filterSpan(result, count, result);
}
void SkFilterShader::shadeSpan16(int x, int y, uint16_t result[], int count) {
SkASSERT(fShader->getFlags() & SkShader::kHasSpan16_Flag);
SkASSERT(fFilter->getFlags() & SkColorFilter::kHasFilter16_Flag);
fShader->shadeSpan16(x, y, result, count);
fFilter->filterSpan16(result, count, result);
}
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