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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/GrConstColorProcessor.h"
#include "effects/GrTextureDomain.h"
#include "effects/GrSimpleTextureEffect.h"
#include "SkGr.h"
#endif
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkImageFilter> SkXfermodeImageFilter::Make(sk_sp<SkXfermode> mode,
sk_sp<SkImageFilter> background,
sk_sp<SkImageFilter> foreground,
const CropRect* cropRect) {
sk_sp<SkImageFilter> inputs[2] = { std::move(background), std::move(foreground) };
return sk_sp<SkImageFilter>(new SkXfermodeImageFilter(mode, inputs, cropRect));
}
SkXfermodeImageFilter::SkXfermodeImageFilter(sk_sp<SkXfermode> mode,
sk_sp<SkImageFilter> inputs[2],
const CropRect* cropRect)
: INHERITED(inputs, 2, cropRect)
, fMode(std::move(mode))
{}
sk_sp<SkFlattenable> SkXfermodeImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
sk_sp<SkXfermode> mode(buffer.readXfermode());
return Make(std::move(mode), common.getInput(0), common.getInput(1),
&common.cropRect());
}
void SkXfermodeImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fMode.get());
}
bool SkXfermodeImageFilter::onFilterImageDeprecated(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->filterInputDeprecated(0, proxy, src, ctx, &background, &backgroundOffset)) {
background.reset();
}
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (!this->filterInputDeprecated(1, proxy, src, ctx, &foreground, &foregroundOffset)) {
foreground.reset();
}
SkIRect foregroundBounds = foreground.bounds();
foregroundBounds.offset(foregroundOffset);
SkIRect srcBounds = background.bounds();
srcBounds.offset(backgroundOffset);
srcBounds.join(foregroundBounds);
SkIRect bounds;
if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
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 !this->cropRectIsSet();
}
#include "SkXfermode_proccoeff.h"
bool SkXfermodeImageFilter::filterImageGPUDeprecated(Proxy* proxy,
const SkBitmap& src,
const Context& ctx,
SkBitmap* result,
SkIPoint* offset) const {
GrContext* context = nullptr;
SkBitmap background = src;
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (!this->filterInputGPUDeprecated(0, proxy, src, ctx, &background, &backgroundOffset)) {
background.reset();
}
GrTexture* backgroundTex = background.getTexture();
if (backgroundTex) {
context = backgroundTex->getContext();
}
SkBitmap foreground = src;
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (!this->filterInputGPUDeprecated(1, proxy, src, ctx, &foreground, &foregroundOffset)) {
foreground.reset();
}
GrTexture* foregroundTex = foreground.getTexture();
if (foregroundTex) {
context = foregroundTex->getContext();
}
if (!context) {
return false;
}
SkIRect bounds = background.bounds().makeOffset(backgroundOffset.x(), backgroundOffset.y());
bounds.join(foreground.bounds().makeOffset(foregroundOffset.x(), foregroundOffset.y()));
if (bounds.isEmpty()) {
return false;
}
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = bounds.width();
desc.fHeight = bounds.height();
desc.fConfig = kSkia8888_GrPixelConfig;
SkAutoTUnref<GrTexture> dst(context->textureProvider()->createApproxTexture(desc));
if (!dst) {
return false;
}
GrPaint paint;
// SRGBTODO: AllowSRGBInputs?
SkAutoTUnref<const GrFragmentProcessor> bgFP;
if (backgroundTex) {
SkMatrix backgroundMatrix;
backgroundMatrix.setIDiv(backgroundTex->width(), backgroundTex->height());
backgroundMatrix.preTranslate(SkIntToScalar(-backgroundOffset.fX),
SkIntToScalar(-backgroundOffset.fY));
bgFP.reset(GrTextureDomainEffect::Create(
backgroundTex, backgroundMatrix,
GrTextureDomain::MakeTexelDomain(backgroundTex, background.bounds()),
GrTextureDomain::kDecal_Mode,
GrTextureParams::kNone_FilterMode));
} else {
bgFP.reset(GrConstColorProcessor::Create(GrColor_TRANSPARENT_BLACK,
GrConstColorProcessor::kIgnore_InputMode));
}
if (foregroundTex) {
SkMatrix foregroundMatrix;
foregroundMatrix.setIDiv(foregroundTex->width(), foregroundTex->height());
foregroundMatrix.preTranslate(SkIntToScalar(-foregroundOffset.fX),
SkIntToScalar(-foregroundOffset.fY));
SkAutoTUnref<const GrFragmentProcessor> foregroundFP;
foregroundFP.reset(GrTextureDomainEffect::Create(
foregroundTex, foregroundMatrix,
GrTextureDomain::MakeTexelDomain(foregroundTex, foreground.bounds()),
GrTextureDomain::kDecal_Mode,
GrTextureParams::kNone_FilterMode));
paint.addColorFragmentProcessor(foregroundFP.get());
// A null fMode is interpreted to mean kSrcOver_Mode (to match raster).
SkAutoTUnref<SkXfermode> mode(SkSafeRef(fMode.get()));
if (!mode) {
// It would be awesome to use SkXfermode::Create here but it knows better
// than us and won't return a kSrcOver_Mode SkXfermode. That means we
// have to get one the hard way.
struct ProcCoeff rec;
rec.fProc = SkXfermode::GetProc(SkXfermode::kSrcOver_Mode);
SkXfermode::ModeAsCoeff(SkXfermode::kSrcOver_Mode, &rec.fSC, &rec.fDC);
mode.reset(new SkProcCoeffXfermode(rec, SkXfermode::kSrcOver_Mode));
}
SkAutoTUnref<const GrFragmentProcessor> xferFP(mode->getFragmentProcessorForImageFilter(bgFP));
// A null 'xferFP' here means kSrc_Mode was used in which case we can just proceed
if (xferFP) {
paint.addColorFragmentProcessor(xferFP);
}
} else {
paint.addColorFragmentProcessor(bgFP);
}
paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
SkAutoTUnref<GrDrawContext> drawContext(context->drawContext(dst->asRenderTarget()));
if (!drawContext) {
return false;
}
SkMatrix matrix;
matrix.setTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
drawContext->drawRect(GrClip::WideOpen(), paint, matrix, SkRect::Make(bounds));
offset->fX = bounds.left();
offset->fY = bounds.top();
GrWrapTextureInBitmap(dst, bounds.width(), bounds.height(), false, result);
return true;
}
#endif
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