cc/quads/texture_draw_quad.cc

   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 #include "cc/quads/texture_draw_quad.h"
   6
   7 #include "base/logging.h"
   8 #include "base/values.h"
   9 #include "cc/base/math_util.h"
  10 #include "ui/gfx/vector2d_f.h"
  11
  12 namespace cc {
  13
  14 TextureDrawQuad::TextureDrawQuad()
  15     : resource_id(0),
  16       premultiplied_alpha(false),
  17       background_color(SK_ColorTRANSPARENT),
  18       flipped(false) {
  19   this->vertex_opacity[0] = 0.f;
  20   this->vertex_opacity[1] = 0.f;
  21   this->vertex_opacity[2] = 0.f;
  22   this->vertex_opacity[3] = 0.f;
  23 }
  24
  25 scoped_ptr<TextureDrawQuad> TextureDrawQuad::Create() {
  26   return make_scoped_ptr(new TextureDrawQuad);
  27 }
  28
  29 void TextureDrawQuad::SetNew(const SharedQuadState* shared_quad_state,
  30                              gfx::Rect rect, gfx::Rect opaque_rect,
  31                              unsigned resource_id, bool premultiplied_alpha,
  32                              gfx::PointF uv_top_left,
  33                              gfx::PointF uv_bottom_right,
  34                              SkColor background_color,
  35                              const float vertex_opacity[4],
  36                              bool flipped) {
  37   gfx::Rect visible_rect = rect;
  38   bool needs_blending = vertex_opacity[0] != 1.0f || vertex_opacity[1] != 1.0f
  39       || vertex_opacity[2] != 1.0f || vertex_opacity[3] != 1.0f;
  40   DrawQuad::SetAll(shared_quad_state, DrawQuad::TEXTURE_CONTENT, rect,
  41                    opaque_rect, visible_rect, needs_blending);
  42   this->resource_id = resource_id;
  43   this->premultiplied_alpha = premultiplied_alpha;
  44   this->uv_top_left = uv_top_left;
  45   this->uv_bottom_right = uv_bottom_right;
  46   this->background_color = background_color;
  47   this->vertex_opacity[0] = vertex_opacity[0];
  48   this->vertex_opacity[1] = vertex_opacity[1];
  49   this->vertex_opacity[2] = vertex_opacity[2];
  50   this->vertex_opacity[3] = vertex_opacity[3];
  51   this->flipped = flipped;
  52 }
  53
  54 void TextureDrawQuad::SetAll(const SharedQuadState* shared_quad_state,
  55                              gfx::Rect rect, gfx::Rect opaque_rect,
  56                              gfx::Rect visible_rect, bool needs_blending,
  57                              unsigned resource_id, bool premultiplied_alpha,
  58                              gfx::PointF uv_top_left,
  59                              gfx::PointF uv_bottom_right,
  60                              SkColor background_color,
  61                              const float vertex_opacity[4],
  62                              bool flipped) {
  63   DrawQuad::SetAll(shared_quad_state, DrawQuad::TEXTURE_CONTENT, rect,
  64                    opaque_rect, visible_rect, needs_blending);
  65   this->resource_id = resource_id;
  66   this->premultiplied_alpha = premultiplied_alpha;
  67   this->uv_top_left = uv_top_left;
  68   this->uv_bottom_right = uv_bottom_right;
  69   this->background_color = background_color;
  70   this->vertex_opacity[0] = vertex_opacity[0];
  71   this->vertex_opacity[1] = vertex_opacity[1];
  72   this->vertex_opacity[2] = vertex_opacity[2];
  73   this->vertex_opacity[3] = vertex_opacity[3];
  74   this->flipped = flipped;
  75 }
  76
  77 void TextureDrawQuad::IterateResources(
  78     const ResourceIteratorCallback& callback) {
  79   resource_id = callback.Run(resource_id);
  80 }
  81
  82 const TextureDrawQuad* TextureDrawQuad::MaterialCast(const DrawQuad* quad) {
  83   DCHECK(quad->material == DrawQuad::TEXTURE_CONTENT);
  84   return static_cast<const TextureDrawQuad*>(quad);
  85 }
  86
  87 bool TextureDrawQuad::PerformClipping() {
  88   // This only occurs if the rect is only scaled and translated (and thus still
  89   // axis aligned).
  90   if (!quadTransform().IsPositiveScaleOrTranslation())
  91     return false;
  92
  93   // Grab our scale and make sure it's positive.
  94   float x_scale = static_cast<float>(quadTransform().matrix().getDouble(0, 0));
  95   float y_scale = static_cast<float>(quadTransform().matrix().getDouble(1, 1));
  96
  97   // Grab our offset.
  98   gfx::Vector2dF offset(
  99       static_cast<float>(quadTransform().matrix().getDouble(0, 3)),
 100       static_cast<float>(quadTransform().matrix().getDouble(1, 3)));
 101
 102   // Transform the rect by the scale and offset.
 103   gfx::RectF rect_f = rect;
 104   rect_f.Scale(x_scale, y_scale);
 105   rect_f += offset;
 106
 107   // Perform clipping and check to see if the result is empty.
 108   gfx::RectF clipped_rect = IntersectRects(rect_f, clipRect());
 109   if (clipped_rect.IsEmpty()) {
 110     rect = gfx::Rect();
 111     uv_top_left = gfx::PointF();
 112     uv_bottom_right = gfx::PointF();
 113     return true;
 114   }
 115
 116   // Create a new uv-rect by clipping the old one to the new bounds.
 117   gfx::Vector2dF uv_scale(uv_bottom_right - uv_top_left);
 118   uv_scale.Scale(1.f / rect_f.width(), 1.f / rect_f.height());
 119   uv_bottom_right = uv_top_left +
 120       gfx::ScaleVector2d(
 121           clipped_rect.bottom_right() - rect_f.origin(),
 122           uv_scale.x(),
 123           uv_scale.y());
 124   uv_top_left = uv_top_left +
 125       gfx::ScaleVector2d(
 126           clipped_rect.origin() - rect_f.origin(),
 127           uv_scale.x(),
 128           uv_scale.y());
 129
 130   // Indexing according to the quad vertex generation:
 131   // 1--2
 132   // |  |
 133   // 0--3
 134   if (vertex_opacity[0] != vertex_opacity[1]
 135       || vertex_opacity[0] != vertex_opacity[2]
 136       || vertex_opacity[0] != vertex_opacity[3]) {
 137     const float x1 = (clipped_rect.x() - rect_f.x()) / rect_f.width();
 138     const float y1 = (clipped_rect.y() - rect_f.y()) / rect_f.height();
 139     const float x3 = (clipped_rect.right() - rect_f.x()) / rect_f.width();
 140     const float y3 = (clipped_rect.bottom() - rect_f.y()) / rect_f.height();
 141     const float x1y1 = x1 * vertex_opacity[2] + (1.0f - x1) * vertex_opacity[1];
 142     const float x1y3 = x1 * vertex_opacity[3] + (1.0f - x1) * vertex_opacity[0];
 143     const float x3y1 = x3 * vertex_opacity[2] + (1.0f - x3) * vertex_opacity[1];
 144     const float x3y3 = x3 * vertex_opacity[3] + (1.0f - x3) * vertex_opacity[0];
 145     vertex_opacity[0] = y3 * x1y3 + (1.0f - y3) * x1y1;
 146     vertex_opacity[1] = y1 * x1y3 + (1.0f - y1) * x1y1;
 147     vertex_opacity[2] = y1 * x3y3 + (1.0f - y1) * x3y1;
 148     vertex_opacity[3] = y3 * x3y3 + (1.0f - y3) * x3y1;
 149   }
 150
 151   // Move the clipped rectangle back into its space.
 152   clipped_rect -= offset;
 153   clipped_rect.Scale(1.0f / x_scale, 1.0f / y_scale);
 154   rect = gfx::Rect(static_cast<int>(clipped_rect.x() + 0.5f),
 155                    static_cast<int>(clipped_rect.y() + 0.5f),
 156                    static_cast<int>(clipped_rect.width() + 0.5f),
 157                    static_cast<int>(clipped_rect.height() + 0.5f));
 158   return true;
 159 }
 160
 161 void TextureDrawQuad::ExtendValue(base::DictionaryValue* value) const {
 162   value->SetInteger("resource_id", resource_id);
 163   value->SetBoolean("premultiplied_alpha", premultiplied_alpha);
 164   value->Set("uv_top_left", MathUtil::AsValue(uv_top_left).release());
 165   value->Set("uv_bottom_right", MathUtil::AsValue(uv_bottom_right).release());
 166   value->SetInteger("background_color", background_color);
 167   scoped_ptr<ListValue> vertex_opacity_value(new ListValue);
 168   for (size_t i = 0; i < 4; ++i)
 169     vertex_opacity_value->AppendDouble(vertex_opacity[i]);
 170   value->Set("vertex_opacity", vertex_opacity_value.release());
 171   value->SetBoolean("flipped", flipped);
 172 }
 173
 174 }  // namespace cc