cc: Implement UnionTraits for DrawQuads

cc/ipc/quads.mojom

 // 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.
 
 module cc.mojom;
 
 import "cc/ipc/filter_operations.mojom";
 import "cc/ipc/render_pass_id.mojom";
 import "cc/ipc/shared_quad_state.mojom";
 import "cc/ipc/surface_id.mojom";
@@ skipping 28 matching lines @@
   // Post-processing filters, applied to the pixels showing through the
   // background of the render pass, from behind it.
   cc.mojom.FilterOperations background_filters;
 };
 
 struct SolidColorQuadState {
   uint32 color;
   bool force_anti_aliasing_off;
 };
 
+struct StreamVideoQuadState {
+  uint32 resource_id;
+  gfx.mojom.Size resource_size_in_pixels;
+  gfx.mojom.Transform matrix;
+};
+
 struct SurfaceQuadState {
   cc.mojom.SurfaceId surface;
 };
 
 struct TextureQuadState {
   uint32 resource_id;
   bool premultiplied_alpha;
   gfx.mojom.PointF uv_top_left;
   gfx.mojom.PointF uv_bottom_right;
   uint32 background_color;
   array<float, 4> vertex_opacity;
   bool y_flipped;
   bool nearest_neighbor;
   bool secure_output_only;
 };
 
 struct TileQuadState {
   gfx.mojom.RectF tex_coord_rect;
   gfx.mojom.Size texture_size;
   bool swizzle_contents;
   uint32 resource_id;
   bool nearest_neighbor;
 };
 
-struct StreamVideoQuadState {
-  uint32 resource_id;
-  gfx.mojom.Size resource_size_in_pixels;
-  gfx.mojom.Transform matrix;
-};
-
 enum YUVColorSpace {
   REC_601,       // SDTV standard with restricted "studio swing" color range.
   REC_709,       // HDTV standard with restricted "studio swing" color range.
   JPEG,          // Full color range [0, 255] JPEG color space.
 };
 
 struct YUVVideoQuadState {
   gfx.mojom.RectF ya_tex_coord_rect;
   gfx.mojom.RectF uv_tex_coord_rect;
   gfx.mojom.Size ya_tex_size;
   gfx.mojom.Size uv_tex_size;
   uint32 y_plane_resource_id;
   uint32 u_plane_resource_id;
   uint32 v_plane_resource_id;
   uint32 a_plane_resource_id;
   YUVColorSpace color_space;
   float resource_offset;
   float resource_multiplier;
   uint32 bits_per_channel;
 };
 
-enum Material {
-  INVALID,
-  DEBUG_BORDER,
-  PICTURE_CONTENT,
-  RENDER_PASS,
-  SOLID_COLOR,
-  STREAM_VIDEO_CONTENT,
-  SURFACE_CONTENT,
-  TEXTURE_CONTENT,
-  TILED_CONTENT,
-  YUV_VIDEO_CONTENT,
+union DrawQuadState {
+  DebugBorderQuadState debug_border_quad_state;
+  RenderPassQuadState render_pass_quad_state;
+  SolidColorQuadState solid_color_quad_state;
+  StreamVideoQuadState stream_video_quad_state;
+  SurfaceQuadState surface_quad_state;
+  TextureQuadState texture_quad_state;
+  TileQuadState tile_quad_state;
+  YUVVideoQuadState yuv_video_quad_state;
 };
 
 struct DrawQuad {
-  Material material;
-
   // This rect, after applying the quad_transform(), gives the geometry that
   // this quad should draw to. This rect lives in content space.
   gfx.mojom.Rect rect;
 
   // This specifies the region of the quad that is opaque. This rect lives in
   // content space.
   gfx.mojom.Rect opaque_rect;
 
   // Allows changing the rect that gets drawn to make it smaller. This value
   // should be clipped to |rect|. This rect lives in content space.
   gfx.mojom.Rect visible_rect;
 
   // Allows changing the rect that gets drawn to make it smaller. This value
   // should be clipped to |rect|. This rect lives in content space.
   bool needs_blending;
 
   // Optionally holds a SharedQuadState (transforms etc) shared by multiple
   // quads.
   SharedQuadState? sqs;
 
-  // Only one of the following will be set, depending on the material.
-  DebugBorderQuadState? debug_border_quad_state;
-  RenderPassQuadState? render_pass_quad_state;
-  SolidColorQuadState? solid_color_quad_state;
-  SurfaceQuadState? surface_quad_state;
-  TextureQuadState? texture_quad_state;
-  TileQuadState? tile_quad_state;
-  StreamVideoQuadState? stream_video_quad_state;
-  YUVVideoQuadState? yuv_video_quad_state;
+  DrawQuadState draw_quad_state;
 };