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/* include/graphics/SkTransparentShader.h
**
** Copyright 2006, Google Inc.
**
** 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.
*/
#ifndef SkTransparentShader_DEFINED
#define SkTransparentShader_DEFINED
#include "SkShader.h"
class SkTransparentShader : public SkShader {
public:
SkTransparentShader() {}
virtual uint32_t getFlags();
virtual bool setContext( const SkBitmap& device,
const SkPaint& paint,
const SkMatrix& matrix);
virtual void shadeSpan(int x, int y, SkPMColor[], int count);
virtual void shadeSpan16(int x, int y, uint16_t span[], int count);
// overrides for SkFlattenable
virtual Factory getFactory() { return Create; }
virtual void flatten(SkFlattenableWriteBuffer& buffer)
{
this->INHERITED::flatten(buffer);
}
private:
// these are a cache from the call to setContext()
const SkBitmap* fDevice;
uint8_t fAlpha;
SkTransparentShader(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {}
static SkFlattenable* Create(SkFlattenableReadBuffer& buffer)
{
return SkNEW_ARGS(SkTransparentShader, (buffer));
}
typedef SkShader INHERITED;
};
#endif
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