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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 sigmaX, SkScalar sigmaY, SkColor color,
ShadowMode shadowMode, SkImageFilter* input,
const CropRect* cropRect)
: INHERITED(1, &input, cropRect)
, fDx(dx)
, fDy(dy)
, fSigmaX(sigmaX)
, fSigmaY(sigmaY)
, fColor(color)
, fShadowMode(shadowMode)
{
}
SkFlattenable* SkDropShadowImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkScalar dx = buffer.readScalar();
SkScalar dy = buffer.readScalar();
SkScalar sigmaX = buffer.readScalar();
SkScalar sigmaY = buffer.readScalar();
SkColor color = buffer.readColor();
ShadowMode shadowMode = buffer.isVersionLT(SkReadBuffer::kDropShadowMode_Version) ?
kDrawShadowAndForeground_ShadowMode :
static_cast<ShadowMode>(buffer.readInt());
return Create(dx, dy, sigmaX, sigmaY, color, shadowMode, common.getInput(0),
&common.cropRect());
}
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);
buffer.writeInt(static_cast<int>(fShadowMode));
}
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;
if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device.get());
SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
ctx.ctm().mapVectors(&sigma, 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 = SkVector::Make(fDx, fDy);
ctx.ctm().mapVectors(&offsetVec, 1);
canvas.translate(SkIntToScalar(srcOffset.fX - bounds.fLeft),
SkIntToScalar(srcOffset.fY - bounds.fTop));
canvas.drawBitmap(src, offsetVec.fX, offsetVec.fY, &paint);
if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
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)));
if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
dst->join(shadowBounds);
} else {
*dst = shadowBounds;
}
}
bool SkDropShadowImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) const {
SkIRect bounds = src;
SkVector offsetVec = SkVector::Make(fDx, fDy);
ctm.mapVectors(&offsetVec, 1);
bounds.offset(-SkScalarCeilToInt(offsetVec.x()),
-SkScalarCeilToInt(offsetVec.y()));
SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
ctm.mapVectors(&sigma, 1);
bounds.outset(SkScalarCeilToInt(SkScalarMul(sigma.x(), SkIntToScalar(3))),
SkScalarCeilToInt(SkScalarMul(sigma.y(), SkIntToScalar(3))));
if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
bounds.join(src);
}
if (getInput(0) && !getInput(0)->filterBounds(bounds, ctm, &bounds)) {
return false;
}
*dst = bounds;
return true;
}
#ifndef SK_IGNORE_TO_STRING
void SkDropShadowImageFilter::toString(SkString* str) const {
str->appendf("SkDropShadowImageFilter: (");
str->appendf("dX: %f ", fDx);
str->appendf("dY: %f ", fDy);
str->appendf("sigmaX: %f ", fSigmaX);
str->appendf("sigmaY: %f ", fSigmaY);
str->append("Color: ");
str->appendHex(fColor);
static const char* gModeStrings[] = {
"kDrawShadowAndForeground", "kDrawShadowOnly"
};
SK_COMPILE_ASSERT(kShadowModeCount == SK_ARRAY_COUNT(gModeStrings), enum_mismatch);
str->appendf(" mode: %s", gModeStrings[fShadowMode]);
str->append(")");
}
#endif
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