Revert "Delete CC."

cc/quads/draw_quad.h

+// Copyright 2012 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_QUADS_DRAW_QUAD_H_
+#define CC_QUADS_DRAW_QUAD_H_
+
+#include "base/callback.h"
+#include "cc/quads/shared_quad_state.h"
+#include "cc/resources/resource_provider.h"
+
+namespace base {
+namespace trace_event {
+class TracedValue;
+}
+class Value;
+class DictionaryValue;
+}
+
+namespace cc {
+
+// DrawQuad is a bag of data used for drawing a quad. Because different
+// materials need different bits of per-quad data to render, classes that derive
+// from DrawQuad store additional data in their derived instance. The Material
+// enum is used to "safely" downcast to the derived class.
+// Note: quads contain rects and sizes, which live in different spaces. There is
+// the "content space", which is the arbitrary space in which the quad's
+// geometry is defined (generally related to the layer that produced the quad,
+// e.g. the content space for TiledLayerImpls, or the geometry space for
+// PictureLayerImpls). There is also the "target space", which is the space, in
+// "physical" pixels, of the render target where the quads is drawn. The quad's
+// transform maps the content space to the target space.
+class DrawQuad {
+ public:
+  enum Material {
+    INVALID,
+    CHECKERBOARD,
+    DEBUG_BORDER,
+    IO_SURFACE_CONTENT,
+    UNUSED_SPACE_FOR_PICTURE_CONTENT,
+    RENDER_PASS,
+    SOLID_COLOR,
+    STREAM_VIDEO_CONTENT,
+    SURFACE_CONTENT,
+    TEXTURE_CONTENT,
+    TILED_CONTENT,
+    YUV_VIDEO_CONTENT,
+    MATERIAL_LAST = YUV_VIDEO_CONTENT
+  };
+
+  virtual ~DrawQuad();
+
+  // TODO(danakj): Chromify or remove these SharedQuadState helpers.
+  const gfx::Transform& quadTransform() const {
+    return shared_quad_state->content_to_target_transform;
+  }
+  gfx::Rect visibleContentRect() const {
+    return shared_quad_state->visible_content_rect;
+  }
+  gfx::Rect clipRect() const { return shared_quad_state->clip_rect; }
+  bool isClipped() const { return shared_quad_state->is_clipped; }
+  float opacity() const { return shared_quad_state->opacity; }
+
+  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::Rect rect;
+
+  // This specifies the region of the quad that is opaque. This rect lives in
+  // content space.
+  gfx::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::Rect visible_rect;
+
+  // By default blending is used when some part of the quad is not opaque.
+  // With this setting, it is possible to force blending on regardless of the
+  // opaque area.
+  bool needs_blending;
+
+  // Stores state common to a large bundle of quads; kept separate for memory
+  // efficiency. There is special treatment to reconstruct these pointers
+  // during serialization.
+  const SharedQuadState* shared_quad_state;
+
+  bool IsDebugQuad() const { return material == DEBUG_BORDER; }
+
+  bool ShouldDrawWithBlending() const {
+    if (needs_blending || shared_quad_state->opacity < 1.0f)
+      return true;
+    if (visible_rect.IsEmpty())
+      return false;
+    return !opaque_rect.Contains(visible_rect);
+  }
+
+  typedef ResourceProvider::ResourceId ResourceId;
+  typedef base::Callback<ResourceId(ResourceId)> ResourceIteratorCallback;
+  virtual void IterateResources(const ResourceIteratorCallback& callback) = 0;
+
+  // Is the left edge of this tile aligned with the originating layer's
+  // left edge?
+  bool IsLeftEdge() const { return !rect.x(); }
+
+  // Is the top edge of this tile aligned with the originating layer's
+  // top edge?
+  bool IsTopEdge() const { return !rect.y(); }
+
+  // Is the right edge of this tile aligned with the originating layer's
+  // right edge?
+  bool IsRightEdge() const {
+    return rect.right() == shared_quad_state->content_bounds.width();
+  }
+
+  // Is the bottom edge of this tile aligned with the originating layer's
+  // bottom edge?
+  bool IsBottomEdge() const {
+    return rect.bottom() == shared_quad_state->content_bounds.height();
+  }
+
+  // Is any edge of this tile aligned with the originating layer's
+  // corresponding edge?
+  bool IsEdge() const {
+    return IsLeftEdge() || IsTopEdge() || IsRightEdge() || IsBottomEdge();
+  }
+
+  void AsValueInto(base::trace_event::TracedValue* value) const;
+
+ protected:
+  DrawQuad();
+
+  void SetAll(const SharedQuadState* shared_quad_state,
+              Material material,
+              const gfx::Rect& rect,
+              const gfx::Rect& opaque_rect,
+              const gfx::Rect& visible_rect,
+              bool needs_blending);
+  virtual void ExtendValue(base::trace_event::TracedValue* value) const = 0;
+};
+
+}  // namespace cc
+
+#endif  // CC_QUADS_DRAW_QUAD_H_