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// Copyright 2017 The Chromium Authors. All rights reserved.
// 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/offscreen_canvas_resource_provider.h"
#include "base/memory/shared_memory.h"
#include "base/numerics/checked_math.h"
#include "components/viz/common/resources/bitmap_allocation.h"
#include "components/viz/common/resources/shared_bitmap.h"
#include "components/viz/common/resources/single_release_callback.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "gpu/command_buffer/common/capabilities.h"
#include "services/viz/public/interfaces/compositing/compositor_frame_sink.mojom-blink.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/canvas_resource.h"
#include "third_party/blink/renderer/platform/graphics/canvas_resource_dispatcher.h"
#include "third_party/blink/renderer/platform/graphics/gpu/shared_gpu_context.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/typed_arrays/array_buffer.h"
#include "third_party/blink/renderer/platform/wtf/typed_arrays/uint8_array.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkImage.h"
#include "third_party/skia/include/core/SkSwizzle.h"
#include "third_party/skia/include/gpu/GrContext.h"
namespace blink {
OffscreenCanvasResourceProvider::OffscreenCanvasResourceProvider(
int width,
int height,
CanvasResourceDispatcher* frame_dispatcher)
: frame_dispatcher_(frame_dispatcher), width_(width), height_(height) {}
OffscreenCanvasResourceProvider::~OffscreenCanvasResourceProvider() = default;
std::unique_ptr<OffscreenCanvasResourceProvider::FrameResource>
OffscreenCanvasResourceProvider::CreateOrRecycleFrameResource() {
if (recyclable_resource_) {
recyclable_resource_->spare_lock = true;
return std::move(recyclable_resource_);
}
return std::make_unique<FrameResource>();
}
void OffscreenCanvasResourceProvider::SetTransferableResourceToSharedBitmap(
viz::TransferableResource& resource,
scoped_refptr<StaticBitmapImage> image) {
std::unique_ptr<FrameResource> frame_resource =
CreateOrRecycleFrameResource();
if (!frame_resource->shared_memory) {
frame_resource->provider = this;
frame_resource->shared_bitmap_id = viz::SharedBitmap::GenerateId();
frame_resource->shared_memory =
viz::bitmap_allocation::AllocateMappedBitmap(gfx::Size(width_, height_),
resource.format);
frame_dispatcher_->DidAllocateSharedBitmap(
viz::bitmap_allocation::DuplicateAndCloseMappedBitmap(
frame_resource->shared_memory.get(), gfx::Size(width_, height_),
resource.format),
SharedBitmapIdToGpuMailboxPtr(frame_resource->shared_bitmap_id));
}
void* pixels = frame_resource->shared_memory->memory();
DCHECK(pixels);
// When |image| is texture backed, this function does a GPU readback which is
// required.
sk_sp<SkImage> sk_image = image->PaintImageForCurrentFrame().GetSkImage();
if (sk_image->bounds().isEmpty())
return;
SkImageInfo image_info = SkImageInfo::Make(
width_, height_, kN32_SkColorType,
image->IsPremultiplied() ? kPremul_SkAlphaType : kUnpremul_SkAlphaType,
sk_image->refColorSpace());
if (image_info.isEmpty())
return;
if (RuntimeEnabledFeatures::CanvasColorManagementEnabled()) {
image_info = image_info.makeColorType(sk_image->colorType());
}
// TODO(junov): Optimize to avoid copying pixels for non-texture-backed
// sk_image. See crbug.com/651456.
bool read_pixels_successful =
sk_image->readPixels(image_info, pixels, image_info.minRowBytes(), 0, 0);
DCHECK(read_pixels_successful);
if (!read_pixels_successful)
return;
resource.mailbox_holder.mailbox = frame_resource->shared_bitmap_id;
resource.mailbox_holder.texture_target = 0;
resource.is_software = true;
resource.id = next_resource_id_;
resource.format = viz::ResourceFormat::RGBA_8888;
resource.size = gfx::Size(width_, height_);
// This indicates the filtering on the resource inherently, not the desired
// filtering effect on the quad.
resource.filter = GL_NEAREST;
// TODO(crbug.com/646022): making this overlay-able.
resource.is_overlay_candidate = false;
resources_.insert(next_resource_id_, std::move(frame_resource));
}
void OffscreenCanvasResourceProvider::
SetTransferableResourceToStaticBitmapImage(
viz::TransferableResource* out_resource,
scoped_refptr<CanvasResource> image) {
DCHECK(image->IsAccelerated());
DCHECK(image->IsValid());
std::unique_ptr<FrameResource> frame_resource =
CreateOrRecycleFrameResource();
// TODO(junov): Using verified sync tokens for each offscreencanvas is
// suboptimal in the case where there are multiple offscreen canvases
// commiting frames. Would be more efficient to batch the verifications.
image->PrepareTransferableResource(
out_resource, &frame_resource->release_callback, kVerifiedSyncToken);
out_resource->id = next_resource_id_;
resources_.insert(next_resource_id_, std::move(frame_resource));
}
void OffscreenCanvasResourceProvider::ReclaimResources(
const WTF::Vector<viz::ReturnedResource>& resources) {
for (const auto& resource : resources) {
auto it = resources_.find(resource.id);
DCHECK(it != resources_.end());
if (it == resources_.end())
continue;
it->value->sync_token = resource.sync_token;
it->value->is_lost = resource.lost;
ReclaimResourceInternal(it);
}
}
void OffscreenCanvasResourceProvider::ReclaimResource(unsigned resource_id) {
auto it = resources_.find(resource_id);
if (it != resources_.end()) {
ReclaimResourceInternal(it);
}
}
void OffscreenCanvasResourceProvider::ReclaimResourceInternal(
const ResourceMap::iterator& it) {
if (it->value->spare_lock) {
it->value->spare_lock = false;
} else {
if (it->value->release_callback) {
it->value->release_callback->Run(it->value->sync_token,
it->value->is_lost);
}
// Recycle resource.
recyclable_resource_ = std::move(it->value);
recyclable_resource_->release_callback = nullptr;
recyclable_resource_->sync_token.Clear();
recyclable_resource_->is_lost = false;
resources_.erase(it);
}
}
OffscreenCanvasResourceProvider::FrameResource::~FrameResource() {
if (release_callback)
release_callback->Run(sync_token, is_lost);
if (provider && !shared_bitmap_id.IsZero()) {
provider->frame_dispatcher_->DidDeleteSharedBitmap(
SharedBitmapIdToGpuMailboxPtr(shared_bitmap_id));
}
}
} // namespace blink
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