Add DCLayerOverlayProcessor and supporting DCLayer structures.

cc/output/dc_layer_overlay.h

Index: cc/output/dc_layer_overlay.h
diff --git a/cc/output/dc_layer_overlay.h b/cc/output/dc_layer_overlay.h
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+++ b/cc/output/dc_layer_overlay.h
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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.
+
+#ifndef CC_OUTPUT_DC_LAYER_OVERLAY_H_
+#define CC_OUTPUT_DC_LAYER_OVERLAY_H_
+
+#include "base/memory/ref_counted.h"
+#include "cc/quads/render_pass.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkMatrix44.h"
+#include "ui/gfx/geometry/rect_f.h"
+#include "ui/gl/dc_renderer_layer_params.h"
+
+namespace cc {
+class DrawQuad;
+class ResourceProvider;
+
+class CC_EXPORT DCLayerOverlaySharedState
+    : public base::RefCounted<DCLayerOverlaySharedState> {
+ public:
+  DCLayerOverlaySharedState() {}
+  int z_order = 0;
+  // If |is_clipped| is true, then clip to |clip_rect| in the target space.
+  bool is_clipped = false;
+  gfx::RectF clip_rect;
+  // The opacity property for the CAayer.
+  float opacity = 1;
+  // The transform to apply to the DCLayer.
+  SkMatrix44 transform = SkMatrix44(SkMatrix44::kIdentity_Constructor);
+
+ private:
+  friend class base::RefCounted<DCLayerOverlaySharedState>;
+  ~DCLayerOverlaySharedState() {}
+};
+
+// Holds all information necessary to construct a DCLayer from a DrawQuad.
+class CC_EXPORT DCLayerOverlay {
+ public:
+  DCLayerOverlay();
+  DCLayerOverlay(const DCLayerOverlay& other);
+  ~DCLayerOverlay();
+
+  // State that is frequently shared between consecutive DCLayerOverlays.
+  scoped_refptr<DCLayerOverlaySharedState> shared_state;
+
+  // Texture that corresponds to an IOSurface to set as the content of the
+  // DCLayer. If this is 0 then the DCLayer is a solid color.
+  unsigned contents_resource_id = 0;
+  // The contents rect property for the DCLayer.
+  gfx::RectF contents_rect;
+  // The bounds for the DCLayer in pixels.
+  gfx::RectF bounds_rect;
+  // The background color property for the DCLayer.
+  SkColor background_color = SK_ColorTRANSPARENT;
+  // The edge anti-aliasing mask property for the DCLayer.
+  unsigned edge_aa_mask = 0;
+  // The minification and magnification filters for the DCLayer.
+  unsigned filter;
+  // If |rpdq| is present, then the renderer must draw the filter effects and
+  // copy the result into an IOSurface.
+  const RenderPassDrawQuad* rpdq = nullptr;
+};
+
+typedef std::vector<DCLayerOverlay> DCLayerOverlayList;
+
+class DCLayerOverlayProcessor {
+ public:
+  enum DCLayerResult {
+    DC_LAYER_SUCCESS,
+    DC_LAYER_FAILED_QUAD_BLEND_MODE,
+    DC_LAYER_FAILED_TEXTURE_NOT_CANDIDATE,
+    DC_LAYER_FAILED_OCCLUDED,
+    DC_LAYER_FAILED_UNKNOWN
+  };
+
+  void Process(ResourceProvider* resource_provider,
+               const gfx::RectF& display_rect,
+               QuadList* quad_list,
+               gfx::Rect* overlay_damage_rect,
+               gfx::Rect* damage_rect,
+               DCLayerOverlayList* ca_layer_overlays);
+  void ClearOverlayState() {
+    previous_frame_underlay_rect_ = gfx::Rect();
+    previous_occlusion_bounding_box_ = gfx::Rect();
+  }
+
+ private:
+  DCLayerResult FromDrawQuad(ResourceProvider* resource_provider,
+                             const gfx::RectF& display_rect,
+                             QuadList::ConstIterator quad_list_begin,
+                             QuadList::ConstIterator quad,
+                             DCLayerOverlay* ca_layer_overlay);
+
+  gfx::Rect previous_frame_underlay_rect_;
+  gfx::Rect previous_occlusion_bounding_box_;
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_DC_LAYER_OVERLAY_H_