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#include "SkBlurDrawLooper.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkPaint.h"
#include "SkMaskFilter.h"
SkBlurDrawLooper::SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy,
SkColor color)
: fDx(dx), fDy(dy), fBlurColor(color)
{
if (radius > 0)
fBlur = SkBlurMaskFilter::Create(radius,
SkBlurMaskFilter::kNormal_BlurStyle);
else
fBlur = NULL;
}
SkBlurDrawLooper::SkBlurDrawLooper(SkFlattenableReadBuffer& buffer)
{
fDx = buffer.readScalar();
fDy = buffer.readScalar();
fBlurColor = buffer.readU32();
fBlur = static_cast<SkMaskFilter*>(buffer.readFlattenable());
}
SkBlurDrawLooper::~SkBlurDrawLooper()
{
fBlur->safeUnref();
}
void SkBlurDrawLooper::flatten(SkFlattenableWriteBuffer& buffer)
{
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.write32(fBlurColor);
buffer.writeFlattenable(fBlur);
}
void SkBlurDrawLooper::init(SkCanvas* canvas, SkPaint* paint)
{
// we do nothing if a maskfilter is already installed
if (paint->getMaskFilter() != NULL)
fState = kDone;
else
{
fState = kBeforeEdge;
fPaint = paint;
fCanvas = canvas;
fSaveCount = canvas->getSaveCount();
}
}
bool SkBlurDrawLooper::next()
{
switch (fState) {
case kBeforeEdge:
fSavedColor = fPaint->getColor();
fPaint->setColor(fBlurColor);
fPaint->setMaskFilter(fBlur);
fCanvas->save(SkCanvas::kMatrix_SaveFlag);
fCanvas->translate(fDx, fDy);
fState = kAfterEdge;
return true;
case kAfterEdge:
fPaint->setColor(fSavedColor);
fPaint->setMaskFilter(NULL);
fCanvas->restore(); // to remove the translate we did earlier
fState = kDone;
return true;
default:
SkASSERT(kDone == fState);
return false;
}
}
void SkBlurDrawLooper::restore()
{
if (kAfterEdge == fState)
{
fPaint->setColor(fSavedColor);
fPaint->setMaskFilter(NULL);
fCanvas->restore(); // to remove the translate we did earlier
fState = kDone;
}
}
///////////////////////////////////////////////////////////////////////////////
static SkFlattenable::Registrar gReg("SkBlurDrawLooper",
SkBlurDrawLooper::CreateProc);
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