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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SkiaOpenGLReadback.h"
#include "Matrix.h"
#include "Properties.h"
#include <SkCanvas.h>
#include <SkSurface.h>
#include <gl/GrGLInterface.h>
#include <gl/GrGLTypes.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
using namespace android::uirenderer::renderthread;
namespace android {
namespace uirenderer {
namespace skiapipeline {
CopyResult SkiaOpenGLReadback::copyImageInto(EGLImageKHR eglImage, const Matrix4& imgTransform,
int imgWidth, int imgHeight, const Rect& srcRect, SkBitmap* bitmap) {
GLuint sourceTexId;
glGenTextures(1, &sourceTexId);
glBindTexture(GL_TEXTURE_EXTERNAL_OES, sourceTexId);
glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, eglImage);
sk_sp<GrContext> grContext = sk_ref_sp(mRenderThread.getGrContext());
if (Properties::getRenderPipelineType() == RenderPipelineType::SkiaVulkan) {
sk_sp<const GrGLInterface> glInterface(GrGLCreateNativeInterface());
LOG_ALWAYS_FATAL_IF(!glInterface.get());
grContext.reset(GrContext::Create(GrBackend::kOpenGL_GrBackend,
(GrBackendContext)glInterface.get()));
} else {
grContext->resetContext();
}
GrGLTextureInfo externalTexture;
externalTexture.fTarget = GL_TEXTURE_EXTERNAL_OES;
externalTexture.fID = sourceTexId;
GrBackendTextureDesc textureDescription;
textureDescription.fWidth = imgWidth;
textureDescription.fHeight = imgHeight;
textureDescription.fConfig = kRGBA_8888_GrPixelConfig;
textureDescription.fOrigin = kTopLeft_GrSurfaceOrigin;
textureDescription.fTextureHandle = reinterpret_cast<GrBackendObject>(&externalTexture);
CopyResult copyResult = CopyResult::UnknownError;
sk_sp<SkImage> image(SkImage::MakeFromAdoptedTexture(grContext.get(), textureDescription));
if (image) {
SkAutoLockPixels alp(*bitmap);
// convert to Skia data structures
const SkRect bufferRect = SkRect::MakeIWH(imgWidth, imgHeight);
SkRect skiaSrcRect = srcRect.toSkRect();
SkMatrix textureMatrix;
imgTransform.copyTo(textureMatrix);
// remove the y-flip applied to the matrix so that we can scale the srcRect.
// This flip is not needed as we specify the origin of the texture when we
// wrap it as an SkImage.
SkMatrix yFlip = SkMatrix::MakeScale(1, -1);
yFlip.postTranslate(0,1);
textureMatrix.preConcat(yFlip);
// copy the entire src if the rect is empty
if (skiaSrcRect.isEmpty()) {
skiaSrcRect = bufferRect;
}
// since the y-flip has been removed we can simply scale & translate
// the source rectangle
textureMatrix.mapRect(&skiaSrcRect);
if (skiaSrcRect.intersect(bufferRect)) {
SkPoint srcOrigin = SkPoint::Make(skiaSrcRect.fLeft, skiaSrcRect.fTop);
// if we need to scale the result we must render to an offscreen buffer
if (bitmap->width() != skiaSrcRect.width()
|| bitmap->height() != skiaSrcRect.height()) {
sk_sp<SkSurface> scaledSurface = SkSurface::MakeRenderTarget(
grContext.get(), SkBudgeted::kYes, bitmap->info());
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
scaledSurface->getCanvas()->drawImageRect(image, skiaSrcRect,
SkRect::MakeWH(bitmap->width(), bitmap->height()), &paint);
image = scaledSurface->makeImageSnapshot();
srcOrigin.set(0,0);
}
if (image->readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(),
srcOrigin.fX, srcOrigin.fY)) {
copyResult = CopyResult::Success;
}
}
}
// make sure that we have deleted the texture (in the SkImage) before we
// destroy the EGLImage that it was created from
image.reset();
return copyResult;
}
} /* namespace skiapipeline */
} /* namespace uirenderer */
} /* namespace android */
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