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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/graphics/image_to_buffer_copier.h"
#include "gpu/GLES2/gl2extchromium.h"
#include "gpu/command_buffer/client/client_shared_image.h"
#include "gpu/command_buffer/client/shared_image_interface.h"
#include "gpu/command_buffer/common/shared_image_usage.h"
#include "third_party/blink/public/platform/platform.h"
#include "third_party/blink/public/platform/web_graphics_context_3d_provider.h"
#include "third_party/blink/renderer/platform/graphics/graphics_types_3d.h"
#include "third_party/blink/renderer/platform/graphics/image.h"
#include "third_party/blink/renderer/platform/graphics/static_bitmap_image.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
namespace blink {
ImageToBufferCopier::ImageToBufferCopier(
gpu::gles2::GLES2Interface* gl,
gpu::SharedImageInterface* sii)
: gl_(gl), sii_(sii) {}
ImageToBufferCopier::~ImageToBufferCopier() {
CleanupDestImage();
}
bool ImageToBufferCopier::EnsureDestImage(const gfx::Size& size) {
// Create a new SharedImage if the size has changed, or we don't have one.
if (dest_image_size_ != size || !dest_shared_image_) {
// Cleanup old copy image before allocating a new one.
CleanupDestImage();
dest_image_size_ = size;
viz::SharedImageFormat color_buffer_format =
viz::SinglePlaneFormat::kRGBA_8888;
#if BUILDFLAG(IS_MAC)
// For Mac, explicitly specify BGRA instead of RGBA so that IOSurface
// format matches shared image format. This is necessary for Graphite where
// IOSurfaces are always used to allow sharing between ANGLE and Dawn.
color_buffer_format = viz::SinglePlaneFormat::kBGRA_8888;
#endif // BUILDFLAG(IS_MAC)
// We copy the contents of the source image into the destination SharedImage
// via GL, followed by giving out the destination SharedImage's native
// buffer handle to eventually be read by the display compositor.
dest_shared_image_ = sii_->CreateSharedImage(
{color_buffer_format, size, gfx::ColorSpace(),
gpu::SHARED_IMAGE_USAGE_GLES2_WRITE, "ImageToBufferCopier"},
gpu::kNullSurfaceHandle, gfx::BufferUsage::SCANOUT);
CHECK(dest_shared_image_);
}
return true;
}
std::pair<gfx::GpuMemoryBufferHandle, gpu::SyncToken>
ImageToBufferCopier::CopyImage(Image* image) {
if (!image)
return {};
TRACE_EVENT0("gpu", "ImageToBufferCopier::CopyImage");
gfx::Size size = image->Size();
if (!EnsureDestImage(size))
return {};
// Bind the write framebuffer to copy image.
auto dest_si_texture = dest_shared_image_->CreateGLTexture(gl_);
auto dest_scoped_si_access =
dest_si_texture->BeginAccess(gpu::SyncToken(), /*readonly=*/false);
GLenum target = GL_TEXTURE_2D;
{
gl_->BindTexture(target, dest_scoped_si_access->texture_id());
gl_->TexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
gl_->TexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
gl_->TexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
gl_->TexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
gl_->BindTexture(GL_TEXTURE_2D, 0);
// Bind the read framebuffer to our image.
StaticBitmapImage* static_image = static_cast<StaticBitmapImage*>(image);
auto source_shared_image = static_image->GetSharedImage();
auto source_si_texture = source_shared_image->CreateGLTexture(gl_);
auto source_scoped_si_access =
source_si_texture->BeginAccess(gpu::SyncToken(), /*readonly=*/true);
gl_->CopySubTextureCHROMIUM(
source_scoped_si_access->texture_id(), 0, GL_TEXTURE_2D,
dest_scoped_si_access->texture_id(), 0, 0, 0, 0, 0, size.width(),
size.height(), false, false, false);
// Cleanup the read framebuffer and texture.
gpu::SharedImageTexture::ScopedAccess::EndAccess(
std::move(source_scoped_si_access));
source_si_texture.reset();
// Cleanup the draw framebuffer and texture.
gpu::SyncToken sync_token = gpu::SharedImageTexture::ScopedAccess::EndAccess(
std::move(dest_scoped_si_access));
sii_->VerifySyncToken(sync_token);
dest_shared_image_->UpdateDestructionSyncToken(sync_token);
dest_si_texture.reset();
static_image->UpdateSyncToken(sync_token);
return std::make_pair(dest_shared_image_
? dest_shared_image_->CloneGpuMemoryBufferHandle()
: gfx::GpuMemoryBufferHandle(),
sync_token);
}
void ImageToBufferCopier::CleanupDestImage() {
dest_shared_image_.reset();
}
} // namespace blink
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