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/* libs/graphics/effects/SkBlurMaskFilter.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 "SkBlurMaskFilter.h"
#include "SkBlurMask.h"
#include "SkBuffer.h"
#include "SkMaskFilter.h"
class SkBlurMaskFilterImpl : public SkMaskFilter {
public:
SkBlurMaskFilterImpl(SkScalar radius, SkBlurMaskFilter::BlurStyle style);
// overrides from SkMaskFilter
virtual SkMask::Format getFormat();
virtual bool filterMask(SkMask* dst, const SkMask& src, const SkMatrix& matrix, SkIPoint* margin);
// overrides from SkFlattenable
// This method is not exported to java.
virtual Factory getFactory();
// This method is not exported to java.
virtual void flatten(SkFlattenableWriteBuffer&);
static SkFlattenable* CreateProc(SkFlattenableReadBuffer&);
private:
SkScalar fRadius;
SkBlurMaskFilter::BlurStyle fBlurStyle;
SkBlurMaskFilterImpl(SkFlattenableReadBuffer&);
typedef SkMaskFilter INHERITED;
};
SkMaskFilter* SkBlurMaskFilter::Create(SkScalar radius, SkBlurMaskFilter::BlurStyle style)
{
if (radius <= 0 || (unsigned)style >= SkBlurMaskFilter::kBlurStyleCount)
return NULL;
return SkNEW_ARGS(SkBlurMaskFilterImpl, (radius, style));
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkScalar radius, SkBlurMaskFilter::BlurStyle style)
: fRadius(radius), fBlurStyle(style)
{
#if 0
fGamma = NULL;
if (gammaScale)
{
fGamma = new U8[256];
if (gammaScale > 0)
SkBlurMask::BuildSqrGamma(fGamma, gammaScale);
else
SkBlurMask::BuildSqrtGamma(fGamma, -gammaScale);
}
#endif
SkASSERT(radius >= 0);
SkASSERT((unsigned)style < SkBlurMaskFilter::kBlurStyleCount);
}
SkMask::Format SkBlurMaskFilterImpl::getFormat()
{
return SkMask::kA8_Format;
}
bool SkBlurMaskFilterImpl::filterMask(SkMask* dst, const SkMask& src, const SkMatrix& matrix, SkIPoint* margin)
{
SkScalar radius = matrix.mapRadius(fRadius);
// To avoid unseemly allocation requests (esp. for finite platforms like
// handset) we limit the radius so something manageable. (as opposed to
// a request like 10,000)
static const SkScalar MAX_RADIUS = SkIntToScalar(128);
radius = SkMinScalar(radius, MAX_RADIUS);
if (SkBlurMask::Blur(dst, src, radius, (SkBlurMask::Style)fBlurStyle))
{
if (margin) {
// we need to integralize radius for our margin, so take the ceil
// just to be safe.
margin->set(SkScalarCeil(radius), SkScalarCeil(radius));
}
return true;
}
return false;
}
SkFlattenable* SkBlurMaskFilterImpl::CreateProc(SkFlattenableReadBuffer& buffer)
{
return SkNEW_ARGS(SkBlurMaskFilterImpl, (buffer));
}
SkFlattenable::Factory SkBlurMaskFilterImpl::getFactory()
{
return CreateProc;
}
SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkFlattenableReadBuffer& buffer) : SkMaskFilter(buffer)
{
fRadius = buffer.readScalar();
fBlurStyle = (SkBlurMaskFilter::BlurStyle)buffer.readS32();
SkASSERT(fRadius >= 0);
SkASSERT((unsigned)fBlurStyle < SkBlurMaskFilter::kBlurStyleCount);
}
void SkBlurMaskFilterImpl::flatten(SkFlattenableWriteBuffer& buffer)
{
this->INHERITED::flatten(buffer);
buffer.writeScalar(fRadius);
buffer.write32(fBlurStyle);
}
///////////////////////////////////////////////////////////////////////////////
static SkFlattenable::Registrar gReg("SkBlurMaskFilter",
SkBlurMaskFilterImpl::CreateProc);
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