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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 "Readback.h"
#include "Caches.h"
#include "Image.h"
#include "GlopBuilder.h"
#include "renderstate/RenderState.h"
#include "renderthread/EglManager.h"
#include "utils/GLUtils.h"
#include <GLES2/gl2.h>
#include <ui/Fence.h>
#include <ui/GraphicBuffer.h>
namespace android {
namespace uirenderer {
CopyResult Readback::copySurfaceInto(renderthread::RenderThread& renderThread,
Surface& surface, SkBitmap* bitmap) {
// TODO: Clean this up and unify it with LayerRenderer::copyLayer,
// of which most of this is copied from.
renderThread.eglManager().initialize();
Caches& caches = Caches::getInstance();
RenderState& renderState = renderThread.renderState();
int destWidth = bitmap->width();
int destHeight = bitmap->height();
if (destWidth > caches.maxTextureSize
|| destHeight > caches.maxTextureSize) {
ALOGW("Can't copy surface into bitmap, %dx%d exceeds max texture size %d",
destWidth, destHeight, caches.maxTextureSize);
return CopyResult::DestinationInvalid;
}
GLuint fbo = renderState.createFramebuffer();
if (!fbo) {
ALOGW("Could not obtain an FBO");
return CopyResult::UnknownError;
}
SkAutoLockPixels alp(*bitmap);
GLuint texture;
GLenum format;
GLenum type;
switch (bitmap->colorType()) {
case kAlpha_8_SkColorType:
format = GL_ALPHA;
type = GL_UNSIGNED_BYTE;
break;
case kRGB_565_SkColorType:
format = GL_RGB;
type = GL_UNSIGNED_SHORT_5_6_5;
break;
case kARGB_4444_SkColorType:
format = GL_RGBA;
type = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case kN32_SkColorType:
default:
format = GL_RGBA;
type = GL_UNSIGNED_BYTE;
break;
}
renderState.bindFramebuffer(fbo);
// TODO: Use layerPool or something to get this maybe? But since we
// need explicit format control we can't currently.
// Setup the rendertarget
glGenTextures(1, &texture);
caches.textureState().activateTexture(0);
caches.textureState().bindTexture(texture);
glPixelStorei(GL_PACK_ALIGNMENT, bitmap->bytesPerPixel());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, format, destWidth, destHeight,
0, format, type, nullptr);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, texture, 0);
// Setup the source
sp<GraphicBuffer> sourceBuffer;
sp<Fence> sourceFence;
Matrix4 texTransform;
status_t err = surface.getLastQueuedBuffer(&sourceBuffer, &sourceFence,
texTransform.data);
texTransform.invalidateType();
if (err != NO_ERROR) {
ALOGW("Failed to get last queued buffer, error = %d", err);
return CopyResult::UnknownError;
}
if (!sourceBuffer.get()) {
ALOGW("Surface doesn't have any previously queued frames, nothing to readback from");
return CopyResult::SourceEmpty;
}
if (sourceBuffer->getUsage() & GRALLOC_USAGE_PROTECTED) {
ALOGW("Surface is protected, unable to copy from it");
return CopyResult::SourceInvalid;
}
err = sourceFence->wait(500 /* ms */);
if (err != NO_ERROR) {
ALOGE("Timeout (500ms) exceeded waiting for buffer fence, abandoning readback attempt");
return CopyResult::Timeout;
}
// TODO: Can't use Image helper since it forces GL_TEXTURE_2D usage via
// GL_OES_EGL_image, which doesn't work since we need samplerExternalOES
// to be able to properly sample from the buffer.
// Create the EGLImage object that maps the GraphicBuffer
EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
EGLClientBuffer clientBuffer = (EGLClientBuffer) sourceBuffer->getNativeBuffer();
EGLint attrs[] = { EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE };
EGLImageKHR sourceImage = eglCreateImageKHR(display, EGL_NO_CONTEXT,
EGL_NATIVE_BUFFER_ANDROID, clientBuffer, attrs);
if (sourceImage == EGL_NO_IMAGE_KHR) {
ALOGW("Error creating image (%#x)", eglGetError());
return CopyResult::UnknownError;
}
GLuint sourceTexId;
// Create a 2D texture to sample from the EGLImage
glGenTextures(1, &sourceTexId);
Caches::getInstance().textureState().bindTexture(GL_TEXTURE_EXTERNAL_OES, sourceTexId);
glEGLImageTargetTexture2DOES(GL_TEXTURE_EXTERNAL_OES, sourceImage);
GLenum status = GL_NO_ERROR;
while ((status = glGetError()) != GL_NO_ERROR) {
ALOGW("Error creating image (%#x)", status);
return CopyResult::UnknownError;
}
Texture sourceTexture(caches);
sourceTexture.wrap(sourceTexId,
sourceBuffer->getWidth(), sourceBuffer->getHeight(), 0 /* total lie */);
{
// Draw & readback
renderState.setViewport(destWidth, destHeight);
renderState.scissor().setEnabled(false);
renderState.blend().syncEnabled();
renderState.stencil().disable();
Rect destRect(destWidth, destHeight);
Glop glop;
GlopBuilder(renderState, caches, &glop)
.setRoundRectClipState(nullptr)
.setMeshTexturedUnitQuad(nullptr)
.setFillExternalTexture(sourceTexture, texTransform)
.setTransform(Matrix4::identity(), TransformFlags::None)
.setModelViewMapUnitToRect(destRect)
.build();
Matrix4 ortho;
ortho.loadOrtho(destWidth, destHeight);
renderState.render(glop, ortho);
glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
type, bitmap->getPixels());
}
// Cleanup
caches.textureState().deleteTexture(texture);
renderState.deleteFramebuffer(fbo);
GL_CHECKPOINT(MODERATE);
return CopyResult::Success;
}
} // namespace uirenderer
} // namespace android
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