Reland Submit Compositor Frame from OffscreenCanvas on main

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.cpp

+// Copyright 2016 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 "platform/graphics/OffscreenCanvasFrameDispatcherImpl.h"
+
+#include "cc/output/compositor_frame.h"
+#include "cc/output/delegated_frame_data.h"
+#include "cc/quads/render_pass.h"
+#include "cc/quads/shared_quad_state.h"
+#include "cc/quads/solid_color_draw_quad.h"
+#include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkXfermode.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace blink {
+
+OffscreenCanvasFrameDispatcherImpl::OffscreenCanvasFrameDispatcherImpl(uint32_t clientId, uint32_t localId, uint64_t nonce, int width, int height)
+    : m_surfaceId(cc::SurfaceId(clientId, localId, nonce))
+    , m_width(width)
+    , m_height(height)
+{
+    DCHECK(!m_service.is_bound());
+    Platform::current()->interfaceProvider()->getInterface(mojo::GetProxy(&m_service));
+}
+
+void OffscreenCanvasFrameDispatcherImpl::dispatchFrame()
+{
+    // TODO(563852/xlai): Currently this is just a simple solid-color compositor
+    // frame. We need to update this function to extract the image data from canvas.
+    cc::CompositorFrame frame;
+    frame.metadata.device_scale_factor = 1.0f;
+    frame.delegated_frame_data.reset(new cc::DelegatedFrameData);
+
+    const gfx::Rect bounds(m_width, m_height);
+    const cc::RenderPassId renderPassId(1, 1);
+    std::unique_ptr<cc::RenderPass> pass = cc::RenderPass::Create();
+    pass->SetAll(renderPassId, bounds, bounds, gfx::Transform(), false);
+
+    cc::SharedQuadState* sqs = pass->CreateAndAppendSharedQuadState();
+    sqs->SetAll(gfx::Transform(), bounds.size(), bounds, bounds, false, 1.f, SkXfermode::kSrcOver_Mode, 0);
+
+    cc::SolidColorDrawQuad* quad = pass->CreateAndAppendDrawQuad<cc::SolidColorDrawQuad>();
+    const bool forceAntialiasingOff = false;
+    quad->SetNew(sqs, bounds, bounds, SK_ColorGREEN, forceAntialiasingOff);
+
+    frame.delegated_frame_data->render_pass_list.push_back(std::move(pass));
+
+    m_service->SubmitCompositorFrame(m_surfaceId, std::move(frame));
+}
+
+} // namespace blink