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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlurDrawLooper.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkMaskFilter.h"
#include "SkColorFilter.h"
SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy,
SkColor color, uint32_t flags)
: fDx(dx), fDy(dy), fBlurColor(color), fBlurFlags(flags), fState(kDone) {
SkASSERT(flags <= kAll_BlurFlag);
if (radius > 0) {
uint32_t blurFlags = flags & kIgnoreTransform_BlurFlag ?
SkBlurMaskFilter::kIgnoreTransform_BlurFlag :
SkBlurMaskFilter::kNone_BlurFlag;
blurFlags |= flags & kHighQuality_BlurFlag ?
SkBlurMaskFilter::kHighQuality_BlurFlag :
SkBlurMaskFilter::kNone_BlurFlag;
fBlur = SkBlurMaskFilter::Create(radius,
SkBlurMaskFilter::kNormal_BlurStyle,
blurFlags);
} else {
fBlur = NULL;
}
if (flags & kOverrideColor_BlurFlag) {
// Set alpha to 1 for the override since transparency will already
// be baked into the blurred mask.
SkColor opaqueColor = SkColorSetA(color, 255);
//The SrcIn xfer mode will multiply 'color' by the incoming alpha
fColorFilter = SkColorFilter::CreateModeFilter(opaqueColor,
SkXfermode::kSrcIn_Mode);
} else {
fColorFilter = NULL;
}
}
SkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer)
: INHERITED(buffer) {
fDx = buffer.readScalar();
fDy = buffer.readScalar();
fBlurColor = buffer.readU32();
fBlur = static_cast<SkMaskFilter*>(buffer.readFlattenable());
fColorFilter = static_cast<SkColorFilter*>(buffer.readFlattenable());
fBlurFlags = buffer.readU32() & kAll_BlurFlag;
}
SkBlurDrawLooper::~SkBlurDrawLooper() {
SkSafeUnref(fBlur);
SkSafeUnref(fColorFilter);
}
void SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.write32(fBlurColor);
buffer.writeFlattenable(fBlur);
buffer.writeFlattenable(fColorFilter);
buffer.write32(fBlurFlags);
}
void SkBlurDrawLooper::init(SkCanvas* canvas) {
fState = kBeforeEdge;
}
bool SkBlurDrawLooper::next(SkCanvas* canvas, SkPaint* paint) {
switch (fState) {
case kBeforeEdge:
// we do nothing if a maskfilter is already installed
if (paint->getMaskFilter()) {
fState = kDone;
return false;
}
#ifdef SK_BUILD_FOR_ANDROID
SkColor blurColor;
blurColor = fBlurColor;
if (SkColorGetA(blurColor) == 255) {
blurColor = SkColorSetA(blurColor, paint->getAlpha());
}
paint->setColor(blurColor);
#else
paint->setColor(fBlurColor);
#endif
paint->setMaskFilter(fBlur);
paint->setColorFilter(fColorFilter);
canvas->save(SkCanvas::kMatrix_SaveFlag);
if (fBlurFlags & kIgnoreTransform_BlurFlag) {
SkMatrix transform(canvas->getTotalMatrix());
transform.postTranslate(fDx, fDy);
canvas->setMatrix(transform);
} else {
canvas->translate(fDx, fDy);
}
fState = kAfterEdge;
return true;
case kAfterEdge:
canvas->restore();
fState = kDone;
return true;
default:
SkASSERT(kDone == fState);
return false;
}
}
///////////////////////////////////////////////////////////////////////////////
SK_DEFINE_FLATTENABLE_REGISTRAR(SkBlurDrawLooper)
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