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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 <GrBackendSurface.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;
GrBackendTexture backendTexture(imgWidth, imgHeight, kRGBA_8888_GrPixelConfig, externalTexture);
CopyResult copyResult = CopyResult::UnknownError;
sk_sp<SkImage> image(SkImage::MakeFromAdoptedTexture(grContext.get(), backendTexture,
kTopLeft_GrSurfaceOrigin));
if (image) {
SkMatrix textureMatrix;
imgTransform.copyTo(textureMatrix);
// remove the y-flip applied to the matrix
SkMatrix yFlip = SkMatrix::MakeScale(1, -1);
yFlip.postTranslate(0,1);
textureMatrix.preConcat(yFlip);
// multiply by image size, because textureMatrix maps to [0..1] range
textureMatrix[SkMatrix::kMTransX] *= imgWidth;
textureMatrix[SkMatrix::kMTransY] *= imgHeight;
// swap rotation and translation part of the matrix, because we convert from
// right-handed Cartesian to left-handed coordinate system.
std::swap(textureMatrix[SkMatrix::kMTransX], textureMatrix[SkMatrix::kMTransY]);
std::swap(textureMatrix[SkMatrix::kMSkewX], textureMatrix[SkMatrix::kMSkewY]);
// convert to Skia data structures
SkRect skiaSrcRect = srcRect.toSkRect();
SkMatrix textureMatrixInv;
SkRect skiaDestRect = SkRect::MakeWH(bitmap->width(), bitmap->height());
bool srcNotEmpty = false;
if (textureMatrix.invert(&textureMatrixInv)) {
if (skiaSrcRect.isEmpty()) {
skiaSrcRect = SkRect::MakeIWH(imgWidth, imgHeight);
srcNotEmpty = !skiaSrcRect.isEmpty();
} else {
// src and dest rectangles need to be converted into texture coordinates before the
// rotation matrix is applied (because drawImageRect preconcat its matrix).
textureMatrixInv.mapRect(&skiaSrcRect);
srcNotEmpty = skiaSrcRect.intersect(SkRect::MakeIWH(imgWidth, imgHeight));
}
textureMatrixInv.mapRect(&skiaDestRect);
}
if (srcNotEmpty) {
// we render in an offscreen buffer to scale and to avoid an issue b/62262733
// with reading incorrect data from EGLImage backed SkImage (likely a driver bug)
sk_sp<SkSurface> scaledSurface = SkSurface::MakeRenderTarget(
grContext.get(), SkBudgeted::kYes, bitmap->info());
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
scaledSurface->getCanvas()->concat(textureMatrix);
scaledSurface->getCanvas()->drawImageRect(image, skiaSrcRect, skiaDestRect, &paint);
image = scaledSurface->makeImageSnapshot();
if (image->readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(), 0, 0)) {
bitmap->notifyPixelsChanged();
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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