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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 "GrDrawContext.h"
#include "effects/GrTextureDomain.h"
#include "effects/GrSimpleTextureEffect.h"
#include "SkGr.h"
#endif
///////////////////////////////////////////////////////////////////////////////
SkXfermodeImageFilter::SkXfermodeImageFilter(SkXfermode* mode,
SkImageFilter* inputs[2],
const CropRect* cropRect)
: INHERITED(2, inputs, cropRect), 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());
}
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;
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (!this->filterInput(0, proxy, src, ctx, &background, &backgroundOffset)) {
background.reset();
}
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (!this->filterInput(1, 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 (nullptr == 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;
}
#ifndef SK_IGNORE_TO_STRING
void SkXfermodeImageFilter::toString(SkString* str) const {
str->appendf("SkXfermodeImageFilter: (");
str->appendf("xfermode: (");
if (fMode) {
fMode->toString(str);
}
str->append(")");
if (this->getInput(0)) {
str->appendf("foreground: (");
this->getInput(0)->toString(str);
str->appendf(")");
}
if (this->getInput(1)) {
str->appendf("background: (");
this->getInput(1)->toString(str);
str->appendf(")");
}
str->append(")");
}
#endif
#if SK_SUPPORT_GPU
bool SkXfermodeImageFilter::canFilterImageGPU() const {
return fMode && fMode->asFragmentProcessor(nullptr, nullptr) && !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 (!this->filterInputGPU(0, proxy, src, ctx, &background, &backgroundOffset)) {
return false;
}
GrTexture* backgroundTex = background.getTexture();
if (nullptr == backgroundTex) {
SkASSERT(false);
return false;
}
SkBitmap foreground = src;
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (!this->filterInputGPU(1, proxy, src, ctx, &foreground, &foregroundOffset)) {
return false;
}
GrTexture* foregroundTex = foreground.getTexture();
GrContext* context = foregroundTex->getContext();
const GrFragmentProcessor* xferFP = nullptr;
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = src.width();
desc.fHeight = src.height();
desc.fConfig = kSkia8888_GrPixelConfig;
SkAutoTUnref<GrTexture> dst(context->textureProvider()->createApproxTexture(desc));
if (!dst) {
return false;
}
GrPaint paint;
SkMatrix bgMatrix;
bgMatrix.setIDiv(backgroundTex->width(), backgroundTex->height());
SkAutoTUnref<const GrFragmentProcessor> bgFP(
GrSimpleTextureEffect::Create(backgroundTex, bgMatrix));
if (!fMode || !fMode->asFragmentProcessor(&xferFP, bgFP)) {
// 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);
SkAutoTUnref<const GrFragmentProcessor> foregroundDomain(GrTextureDomainEffect::Create(
foregroundTex, foregroundMatrix,
GrTextureDomain::MakeTexelDomain(foregroundTex, foreground.bounds()),
GrTextureDomain::kDecal_Mode,
GrTextureParams::kNone_FilterMode)
);
paint.addColorFragmentProcessor(foregroundDomain.get());
if (xferFP) {
paint.addColorFragmentProcessor(xferFP)->unref();
}
SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(dst->asRenderTarget()));
if (!drawContext) {
return false;
}
drawContext->drawRect(GrClip::WideOpen(), 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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