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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlurMaskFilter.h"
#include "SkBlurMask.h"
#include "SkBuffer.h"
#include "SkMaskFilter.h"
class SkBlurMaskFilterImpl : public SkMaskFilter {
public:
SkBlurMaskFilterImpl(SkScalar radius, SkBlurMaskFilter::BlurStyle,
uint32_t flags);
// overrides from SkMaskFilter
virtual SkMask::Format getFormat() SK_OVERRIDE;
virtual bool filterMask(SkMask* dst, const SkMask& src, const SkMatrix&,
SkIPoint* margin) SK_OVERRIDE;
virtual BlurType asABlur(BlurInfo*) const SK_OVERRIDE;
virtual void computeFastBounds(const SkRect& src, SkRect* dst) SK_OVERRIDE;
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurMaskFilterImpl)
private:
SkScalar fRadius;
SkBlurMaskFilter::BlurStyle fBlurStyle;
uint32_t fBlurFlags;
SkBlurMaskFilterImpl(SkFlattenableReadBuffer&);
virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
typedef SkMaskFilter INHERITED;
};
SkMaskFilter* SkBlurMaskFilter::Create(SkScalar radius,
SkBlurMaskFilter::BlurStyle style,
uint32_t flags) {
// use !(radius > 0) instead of radius <= 0 to reject NaN values
if (!(radius > 0) || (unsigned)style >= SkBlurMaskFilter::kBlurStyleCount
|| flags > SkBlurMaskFilter::kAll_BlurFlag) {
return NULL;
}
return SkNEW_ARGS(SkBlurMaskFilterImpl, (radius, style, flags));
}
///////////////////////////////////////////////////////////////////////////////
SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkScalar radius,
SkBlurMaskFilter::BlurStyle style,
uint32_t flags)
: fRadius(radius), fBlurStyle(style), fBlurFlags(flags) {
#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);
SkASSERT(flags <= SkBlurMaskFilter::kAll_BlurFlag);
}
SkMask::Format SkBlurMaskFilterImpl::getFormat() {
return SkMask::kA8_Format;
}
bool SkBlurMaskFilterImpl::filterMask(SkMask* dst, const SkMask& src,
const SkMatrix& matrix, SkIPoint* margin) {
SkScalar radius;
if (fBlurFlags & SkBlurMaskFilter::kIgnoreTransform_BlurFlag) {
radius = fRadius;
} else {
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);
SkBlurMask::Quality blurQuality =
(fBlurFlags & SkBlurMaskFilter::kHighQuality_BlurFlag) ?
SkBlurMask::kHigh_Quality : SkBlurMask::kLow_Quality;
return SkBlurMask::Blur(dst, src, radius, (SkBlurMask::Style)fBlurStyle,
blurQuality, margin);
}
void SkBlurMaskFilterImpl::computeFastBounds(const SkRect& src, SkRect* dst) {
dst->set(src.fLeft - fRadius, src.fTop - fRadius,
src.fRight + fRadius, src.fBottom + fRadius);
}
SkBlurMaskFilterImpl::SkBlurMaskFilterImpl(SkFlattenableReadBuffer& buffer)
: SkMaskFilter(buffer) {
fRadius = buffer.readScalar();
fBlurStyle = (SkBlurMaskFilter::BlurStyle)buffer.readS32();
fBlurFlags = buffer.readU32() & SkBlurMaskFilter::kAll_BlurFlag;
SkASSERT(fRadius >= 0);
SkASSERT((unsigned)fBlurStyle < SkBlurMaskFilter::kBlurStyleCount);
}
void SkBlurMaskFilterImpl::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fRadius);
buffer.write32(fBlurStyle);
buffer.write32(fBlurFlags);
}
static const SkMaskFilter::BlurType gBlurStyle2BlurType[] = {
SkMaskFilter::kNormal_BlurType,
SkMaskFilter::kSolid_BlurType,
SkMaskFilter::kOuter_BlurType,
SkMaskFilter::kInner_BlurType,
};
SkMaskFilter::BlurType SkBlurMaskFilterImpl::asABlur(BlurInfo* info) const {
if (info) {
info->fRadius = fRadius;
info->fIgnoreTransform = SkToBool(fBlurFlags & SkBlurMaskFilter::kIgnoreTransform_BlurFlag);
info->fHighQuality = SkToBool(fBlurFlags & SkBlurMaskFilter::kHighQuality_BlurFlag);
}
return gBlurStyle2BlurType[fBlurStyle];
}
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkBlurMaskFilter)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkBlurMaskFilterImpl)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
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