cc/quads/draw_quad.h

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CC_QUADS_DRAW_QUAD_H_
   6 #define CC_QUADS_DRAW_QUAD_H_
   7
   8 #include "base/callback.h"
   9 #include "cc/base/cc_export.h"
  10 #include "cc/base/resource_id.h"
  11 #include "cc/quads/shared_quad_state.h"
  12
  13 namespace base {
  14 namespace trace_event {
  15 class TracedValue;
  16 }
  17 class Value;
  18 class DictionaryValue;
  19 }
  20
  21 namespace cc {
  22
  23 // DrawQuad is a bag of data used for drawing a quad. Because different
  24 // materials need different bits of per-quad data to render, classes that derive
  25 // from DrawQuad store additional data in their derived instance. The Material
  26 // enum is used to "safely" downcast to the derived class.
  27 // Note: quads contain rects and sizes, which live in different spaces. There is
  28 // the "content space", which is the arbitrary space in which the quad's
  29 // geometry is defined (generally related to the layer that produced the quad,
  30 // e.g. the content space for TiledLayerImpls, or the geometry space for
  31 // PictureLayerImpls). There is also the "target space", which is the space, in
  32 // "physical" pixels, of the render target where the quads is drawn. The quad's
  33 // transform maps the content space to the target space.
  34 class CC_EXPORT DrawQuad {
  35  public:
  36   enum Material {
  37     INVALID,
  38     CHECKERBOARD,
  39     DEBUG_BORDER,
  40     IO_SURFACE_CONTENT,
  41     PICTURE_CONTENT,
  42     RENDER_PASS,
  43     SOLID_COLOR,
  44     STREAM_VIDEO_CONTENT,
  45     SURFACE_CONTENT,
  46     TEXTURE_CONTENT,
  47     TILED_CONTENT,
  48     YUV_VIDEO_CONTENT,
  49     MATERIAL_LAST = YUV_VIDEO_CONTENT
  50   };
  51
  52   virtual ~DrawQuad();
  53
  54   // TODO(danakj): Chromify or remove these SharedQuadState helpers.
  55   const gfx::Transform& quadTransform() const {
  56     return shared_quad_state->content_to_target_transform;
  57   }
  58   gfx::Rect visibleContentRect() const {
  59     return shared_quad_state->visible_content_rect;
  60   }
  61   gfx::Rect clipRect() const { return shared_quad_state->clip_rect; }
  62   bool isClipped() const { return shared_quad_state->is_clipped; }
  63   float opacity() const { return shared_quad_state->opacity; }
  64
  65   Material material;
  66
  67   // This rect, after applying the quad_transform(), gives the geometry that
  68   // this quad should draw to. This rect lives in content space.
  69   gfx::Rect rect;
  70
  71   // This specifies the region of the quad that is opaque. This rect lives in
  72   // content space.
  73   gfx::Rect opaque_rect;
  74
  75   // Allows changing the rect that gets drawn to make it smaller. This value
  76   // should be clipped to |rect|. This rect lives in content space.
  77   gfx::Rect visible_rect;
  78
  79   // By default blending is used when some part of the quad is not opaque.
  80   // With this setting, it is possible to force blending on regardless of the
  81   // opaque area.
  82   bool needs_blending;
  83
  84   // Stores state common to a large bundle of quads; kept separate for memory
  85   // efficiency. There is special treatment to reconstruct these pointers
  86   // during serialization.
  87   const SharedQuadState* shared_quad_state;
  88
  89   bool IsDebugQuad() const { return material == DEBUG_BORDER; }
  90
  91   bool ShouldDrawWithBlending() const {
  92     if (needs_blending || shared_quad_state->opacity < 1.0f)
  93       return true;
  94     if (visible_rect.IsEmpty())
  95       return false;
  96     return !opaque_rect.Contains(visible_rect);
  97   }
  98
  99   // Is the left edge of this tile aligned with the originating layer's
 100   // left edge?
 101   bool IsLeftEdge() const { return !rect.x(); }
 102
 103   // Is the top edge of this tile aligned with the originating layer's
 104   // top edge?
 105   bool IsTopEdge() const { return !rect.y(); }
 106
 107   // Is the right edge of this tile aligned with the originating layer's
 108   // right edge?
 109   bool IsRightEdge() const {
 110     return rect.right() == shared_quad_state->content_bounds.width();
 111   }
 112
 113   // Is the bottom edge of this tile aligned with the originating layer's
 114   // bottom edge?
 115   bool IsBottomEdge() const {
 116     return rect.bottom() == shared_quad_state->content_bounds.height();
 117   }
 118
 119   // Is any edge of this tile aligned with the originating layer's
 120   // corresponding edge?
 121   bool IsEdge() const {
 122     return IsLeftEdge() || IsTopEdge() || IsRightEdge() || IsBottomEdge();
 123   }
 124
 125   void AsValueInto(base::trace_event::TracedValue* value) const;
 126
 127   struct CC_EXPORT Resources {
 128     enum : size_t { kMaxResourceIdCount = 4 };
 129     Resources();
 130
 131     ResourceId* begin() { return ids; }
 132     ResourceId* end() {
 133       DCHECK_LE(count, kMaxResourceIdCount);
 134       return ids + count;
 135     }
 136
 137     size_t count;
 138     ResourceId ids[kMaxResourceIdCount];
 139   };
 140
 141   Resources resources;
 142
 143  protected:
 144   DrawQuad();
 145
 146   void SetAll(const SharedQuadState* shared_quad_state,
 147               Material material,
 148               const gfx::Rect& rect,
 149               const gfx::Rect& opaque_rect,
 150               const gfx::Rect& visible_rect,
 151               bool needs_blending);
 152   virtual void ExtendValue(base::trace_event::TracedValue* value) const = 0;
 153 };
 154
 155 }  // namespace cc
 156
 157 #endif  // CC_QUADS_DRAW_QUAD_H_