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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 "SkReadBuffer.h"
#include "SkWriteBuffer.h"
SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigma, SkColor color, SkImageFilter* input)
: INHERITED(input)
, fDx(dx)
, fDy(dy)
, fSigmaX(sigma)
, fSigmaY(sigma)
, fColor(color)
{
}
SkDropShadowImageFilter::SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor color, SkImageFilter* input, const CropRect* cropRect)
: INHERITED(input, cropRect)
, fDx(dx)
, fDy(dy)
, fSigmaX(sigmaX)
, fSigmaY(sigmaY)
, fColor(color)
{
}
SkDropShadowImageFilter::SkDropShadowImageFilter(SkReadBuffer& buffer)
: INHERITED(1, buffer) {
fDx = buffer.readScalar();
fDy = buffer.readScalar();
fSigmaX = buffer.readScalar();
fSigmaY = buffer.readScalar();
fColor = buffer.readColor();
buffer.validate(SkScalarIsFinite(fDx) &&
SkScalarIsFinite(fDy) &&
SkScalarIsFinite(fSigmaX) &&
SkScalarIsFinite(fSigmaY));
}
void SkDropShadowImageFilter::flatten(SkWriteBuffer& buffer) const
{
this->INHERITED::flatten(buffer);
buffer.writeScalar(fDx);
buffer.writeScalar(fDy);
buffer.writeScalar(fSigmaX);
buffer.writeScalar(fSigmaY);
buffer.writeColor(fColor);
}
bool SkDropShadowImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source, const Context& ctx, SkBitmap* result, SkIPoint* offset) const
{
SkBitmap src = source;
SkIPoint srcOffset = SkIPoint::Make(0, 0);
if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset))
return false;
SkIRect bounds;
src.getBounds(&bounds);
bounds.offset(srcOffset);
if (!this->applyCropRect(&bounds, ctx.ctm())) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device.get());
SkVector sigma, localSigma = SkVector::Make(fSigmaX, fSigmaY);
ctx.ctm().mapVectors(&sigma, &localSigma, 1);
sigma.fX = SkMaxScalar(0, sigma.fX);
sigma.fY = SkMaxScalar(0, sigma.fY);
SkAutoTUnref<SkImageFilter> blurFilter(SkBlurImageFilter::Create(sigma.fX, sigma.fY));
SkAutoTUnref<SkColorFilter> colorFilter(SkColorFilter::CreateModeFilter(fColor, SkXfermode::kSrcIn_Mode));
SkPaint paint;
paint.setImageFilter(blurFilter.get());
paint.setColorFilter(colorFilter.get());
paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
SkVector offsetVec, localOffsetVec = SkVector::Make(fDx, fDy);
ctx.ctm().mapVectors(&offsetVec, &localOffsetVec, 1);
canvas.translate(-SkIntToScalar(bounds.fLeft), -SkIntToScalar(bounds.fTop));
canvas.drawBitmap(src, offsetVec.fX, offsetVec.fY, &paint);
canvas.drawBitmap(src, 0, 0);
*result = device->accessBitmap(false);
offset->fX = bounds.fLeft;
offset->fY = bounds.fTop;
return true;
}
void SkDropShadowImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
if (getInput(0)) {
getInput(0)->computeFastBounds(src, dst);
} else {
*dst = src;
}
SkRect shadowBounds = *dst;
shadowBounds.offset(fDx, fDy);
shadowBounds.outset(SkScalarMul(fSigmaX, SkIntToScalar(3)),
SkScalarMul(fSigmaY, SkIntToScalar(3)));
dst->join(shadowBounds);
}
bool SkDropShadowImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) const {
SkIRect bounds = src;
if (getInput(0) && !getInput(0)->filterBounds(src, ctm, &bounds)) {
return false;
}
SkVector offsetVec, localOffsetVec = SkVector::Make(fDx, fDy);
ctm.mapVectors(&offsetVec, &localOffsetVec, 1);
bounds.offset(-SkScalarCeilToInt(offsetVec.x()),
-SkScalarCeilToInt(offsetVec.y()));
SkVector sigma, localSigma = SkVector::Make(fSigmaX, fSigmaY);
ctm.mapVectors(&sigma, &localSigma, 1);
bounds.outset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar(3))),
SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar(3))));
bounds.join(src);
*dst = bounds;
return true;
}
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