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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkDropShadowImageFilter.h"
#include "SkBitmap.h"
#include "SkBlurImageFilter.h"
#include "SkCanvas.h"
#include "SkColorMatrixFilter.h"
#include "SkDevice.h"
#include "SkFlattenableBuffers.h"
SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigma, SkColor color, SkImageFilter* input)
: SkImageFilter(input)
, fDx(dx)
, fDy(dy)
, fSigma(sigma)
, fColor(color)
{
}
SkDropShadowImageFilter::SkDropShadowImageFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer)
{
fDx = buffer.readScalar();
fDy = buffer.readScalar();
fSigma = buffer.readScalar();
fColor = buffer.readColor();
buffer.validate(SkScalarIsFinite(fDx) &&
SkScalarIsFinite(fDy) &&
SkScalarIsFinite(fSigma));
}
void SkDropShadowImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const
{
this->INHERITED::flatten(buffer);
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.writeScalar(fSigma);
buffer.writeColor(fColor);
}
bool SkDropShadowImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source, const SkMatrix& matrix, SkBitmap* result, SkIPoint* loc)
{
SkBitmap src = source;
if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, loc))
return false;
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(src.width(), src.height()));
SkCanvas canvas(device.get());
SkAutoTUnref<SkImageFilter> blurFilter(new SkBlurImageFilter(fSigma, fSigma));
SkAutoTUnref<SkColorFilter> colorFilter(SkColorFilter::CreateModeFilter(fColor, SkXfermode::kSrcIn_Mode));
SkPaint paint;
paint.setImageFilter(blurFilter.get());
paint.setColorFilter(colorFilter.get());
paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
canvas.drawBitmap(src, fDx, fDy, &paint);
canvas.drawBitmap(src, 0, 0);
*result = device->accessBitmap(false);
return true;
}
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