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/*
* Copyright 2013 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkXfermodeImageFilter.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkColorPriv.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkXfermode.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "effects/GrSimpleTextureEffect.h"
#include "SkGr.h"
#endif
///////////////////////////////////////////////////////////////////////////////
SkXfermodeImageFilter::SkXfermodeImageFilter(SkXfermode* mode,
SkImageFilter* inputs[2],
const CropRect* cropRect,
uint32_t uniqueID)
: INHERITED(2, inputs, cropRect, uniqueID), fMode(mode) {
SkSafeRef(fMode);
}
SkXfermodeImageFilter::~SkXfermodeImageFilter() {
SkSafeUnref(fMode);
}
SkFlattenable* SkXfermodeImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
SkAutoTUnref<SkXfermode> mode(buffer.readXfermode());
return Create(mode, common.getInput(0), common.getInput(1), &common.cropRect(), common.uniqueID());
}
void SkXfermodeImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fMode);
}
bool SkXfermodeImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& src,
const Context& ctx,
SkBitmap* dst,
SkIPoint* offset) const {
SkBitmap background = src, foreground = src;
SkImageFilter* backgroundInput = getInput(0);
SkImageFilter* foregroundInput = getInput(1);
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (backgroundInput &&
!backgroundInput->filterImage(proxy, src, ctx, &background, &backgroundOffset)) {
background.reset();
}
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (foregroundInput &&
!foregroundInput->filterImage(proxy, src, ctx, &foreground, &foregroundOffset)) {
foreground.reset();
}
SkIRect bounds, foregroundBounds;
if (!applyCropRect(ctx, foreground, foregroundOffset, &foregroundBounds)) {
foregroundBounds.setEmpty();
foreground.reset();
}
if (!applyCropRect(ctx, background, backgroundOffset, &bounds)) {
bounds.setEmpty();
background.reset();
}
bounds.join(foregroundBounds);
if (bounds.isEmpty()) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device);
canvas.translate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas.drawBitmap(background, SkIntToScalar(backgroundOffset.fX),
SkIntToScalar(backgroundOffset.fY), &paint);
paint.setXfermode(fMode);
canvas.drawBitmap(foreground, SkIntToScalar(foregroundOffset.fX),
SkIntToScalar(foregroundOffset.fY), &paint);
canvas.clipRect(SkRect::Make(foregroundBounds), SkRegion::kDifference_Op);
paint.setColor(SK_ColorTRANSPARENT);
canvas.drawPaint(paint);
*dst = device->accessBitmap(false);
offset->fX = bounds.left();
offset->fY = bounds.top();
return true;
}
#if SK_SUPPORT_GPU
bool SkXfermodeImageFilter::canFilterImageGPU() const {
return fMode && fMode->asFragmentProcessor(NULL, NULL) && !cropRectIsSet();
}
bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
const SkBitmap& src,
const Context& ctx,
SkBitmap* result,
SkIPoint* offset) const {
SkBitmap background = src;
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &background,
&backgroundOffset)) {
return onFilterImage(proxy, src, ctx, result, offset);
}
GrTexture* backgroundTex = background.getTexture();
SkBitmap foreground = src;
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (getInput(1) && !getInput(1)->getInputResultGPU(proxy, src, ctx, &foreground,
&foregroundOffset)) {
return onFilterImage(proxy, src, ctx, result, offset);
}
GrTexture* foregroundTex = foreground.getTexture();
GrContext* context = foregroundTex->getContext();
GrFragmentProcessor* xferProcessor = NULL;
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag | kNoStencil_GrSurfaceFlag;
desc.fWidth = src.width();
desc.fHeight = src.height();
desc.fConfig = kSkia8888_GrPixelConfig;
SkAutoTUnref<GrTexture> dst(
context->refScratchTexture(desc, GrContext::kApprox_ScratchTexMatch));
if (!dst) {
return false;
}
GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
if (!fMode || !fMode->asFragmentProcessor(&xferProcessor, backgroundTex)) {
// canFilterImageGPU() should've taken care of this
SkASSERT(false);
return false;
}
SkMatrix foregroundMatrix = GrCoordTransform::MakeDivByTextureWHMatrix(foregroundTex);
foregroundMatrix.preTranslate(SkIntToScalar(backgroundOffset.fX-foregroundOffset.fX),
SkIntToScalar(backgroundOffset.fY-foregroundOffset.fY));
SkRect srcRect;
src.getBounds(&srcRect);
GrPaint paint;
paint.addColorTextureProcessor(foregroundTex, foregroundMatrix);
paint.addColorProcessor(xferProcessor)->unref();
context->drawRect(paint, SkMatrix::I(), srcRect);
offset->fX = backgroundOffset.fX;
offset->fY = backgroundOffset.fY;
WrapTexture(dst, src.width(), src.height(), result);
return true;
}
#endif
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