[PPAPI] Compositor API implementation

ppapi/shared_impl/compositor_layer_data.h

Index: ppapi/shared_impl/compositor_layer_data.h
diff --git a/ppapi/shared_impl/compositor_layer_data.h b/ppapi/shared_impl/compositor_layer_data.h
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+++ b/ppapi/shared_impl/compositor_layer_data.h
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+// Copyright 2014 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 PPAPI_SHARED_IMPL_COMPOSITOR_LAYER_DATA_H_
+#define PPAPI_SHARED_IMPL_COMPOSITOR_LAYER_DATA_H_
+
+#include <string.h>
+
+#include "gpu/command_buffer/common/mailbox.h"
+#include "ppapi/c/ppb_compositor_layer.h"
+#include "ppapi/shared_impl/host_resource.h"
+
+namespace ppapi {
+
+struct CompositorLayerData {
+  typedef int8_t Mailbox[GL_MAILBOX_SIZE_CHROMIUM];
+
+  enum Type {
+    TYPE_UNKNOWN = 0,
+    TYPE_COLOR,
+    TYPE_TEXTURE,
+    TYPE_IMAGE,
+    TYPE_LAST = TYPE_IMAGE,
+  };
+
+  CompositorLayerData()
+      : type(TYPE_UNKNOWN),
+        size(PP_MakeSize(0, 0)),
+        clip_rect(PP_MakeRectFromXYWH(0, 0, 0, 0)),
+        blend_mode(PP_BLENDMODE_SRC_OVER),
+        opacity(255) {
+    transform[0] = 1.0f;
+    transform[1] = 0.0f;
+    transform[2] = 0.0f;
+    transform[3] = 0.0f;
+    transform[4] = 0.0f;
+    transform[5] = 1.0f;
+    transform[6] = 0.0f;
+    transform[7] = 0.0f;
+    transform[8] = 0.0f;
+    transform[9] = 0.0f;
+    transform[10] = 1.0f;
+    transform[11] = 0.0f;
+    transform[12] = 0.0f;
+    transform[13] = 0.0f;
+    transform[14] = 0.0f;
+    transform[15] = 1.0f;
+
+    // Becasue texture is the biggest struct in the union, so
+    // we only need set it to 0.
+    memset(&texture, 0, sizeof(texture));
+  }
+
+  Type type;
+  PP_Size size;
+  PP_Rect clip_rect;
+  float transform[16];
+  PP_BlendMode blend_mode;
+  uint8_t opacity;
+
+  union {
+    // Properties for a color layer.
+    struct {
+      uint8_t red;
+      uint8_t green;
+      uint8_t blue;
+      uint8_t alpha;
+    } color;
+
+    // Properties for a texture layer.
+    struct {
+      int32_t id;
+      Mailbox mailbox;
+      uint32_t sync_point;
+      PP_FloatRect source_rect;
+      bool premult_alpha;
+    } texture;
+
+    // Properties for an image layer
+    struct {
+      int32_t id;
+      PP_Instance instance;
+      PP_Resource host_resource;
+      PP_FloatRect source_rect;
+    } image;
+  };
+};
+
+}  // namespace ppapi
+
+#endif  // PPAPI_SHARED_IMPL_COMPOSITOR_LAYER_DATA_H_