Initial checkin of the new Mozart compositor.

services/gfx/compositor/render/render_image.h

+// Copyright 2015 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.
+
+#ifndef SERVICES_GFX_COMPOSITOR_RENDER_RENDER_IMAGE_H_
+#define SERVICES_GFX_COMPOSITOR_RENDER_RENDER_IMAGE_H_
+
+#include <memory>
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2extmojo.h>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/task_runner.h"
+#include "services/gfx/compositor/render/painting.h"
+
+class SkImage;
+
+namespace compositor {
+
+// Describes an image which can be rendered by the compositor.
+//
+// Render objects are thread-safe, immutable, and reference counted via
+// std::shared_ptr.  They have no direct references to the scene graph.
+//
+// TODO(jeffbrown): Generalize this beyond mailbox textures.
+class RenderImage {
+ public:
+  RenderImage(const uint8_t mailbox_name[GL_MAILBOX_SIZE_CHROMIUM],
+              uint32_t sync_point,
+              uint32_t width,
+              uint32_t height,
+              const scoped_refptr<base::TaskRunner>& task_runner,
+              const base::Closure& release_callback);
+  ~RenderImage();
+
+  // Creates a new image backed by a mailbox texture.
+  // When the last reference is released, the associated release task is
+  // posted to the task runner.
+  static std::shared_ptr<RenderImage> FromMailboxTexture(
+      const uint8_t mailbox_name[GL_MAILBOX_SIZE_CHROMIUM],
+      uint32_t sync_point,
+      uint32_t width,
+      uint32_t height,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      const base::Closure& release_task) {
+    return std::make_shared<RenderImage>(mailbox_name, sync_point, width,
+                                         height, task_runner, release_task);
+  }
+
+  // Gets the dimensions of the image.
+  uint32_t width() const { return width_; }
+  uint32_t height() const { return height_; }
+
+  // Creates a Skia image from the underlying texture.
+  // Automatically inserts a sync point into the GL command stream.
+  // Returns null if the image could not be created.
+  skia::RefPtr<SkImage> CreateSkImage(
+      const PaintingScope& painting_scope) const;
+
+ private:
+  GLbyte mailbox_name_[GL_MAILBOX_SIZE_CHROMIUM];
+  uint32_t const sync_point_;
+  uint32_t const width_;
+  uint32_t const height_;
+
+  scoped_refptr<base::TaskRunner> const task_runner_;
+  base::Closure const release_task_;
+
+  DISALLOW_COPY_AND_ASSIGN(RenderImage);
+};
+
+}  // namespace compositor
+
+#endif  // SERVICES_GFX_COMPOSITOR_RENDER_RENDER_IMAGE_H_