cc/output/overlay_strategy_common.cc

   1 // Copyright 2015 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/output/overlay_strategy_common.h"
   6
   7 #include <limits>
   8
   9 #include "cc/quads/solid_color_draw_quad.h"
  10 #include "cc/quads/stream_video_draw_quad.h"
  11 #include "cc/quads/texture_draw_quad.h"
  12 #include "cc/resources/resource_provider.h"
  13 #include "ui/gfx/geometry/point3_f.h"
  14 #include "ui/gfx/geometry/rect_conversions.h"
  15 #include "ui/gfx/transform.h"
  16
  17 namespace cc {
  18
  19 OverlayStrategyCommon::OverlayStrategyCommon(
  20     OverlayCandidateValidator* capability_checker,
  21     ResourceProvider* resource_provider)
  22     : capability_checker_(capability_checker),
  23       resource_provider_(resource_provider) {
  24 }
  25
  26 OverlayStrategyCommon::~OverlayStrategyCommon() {
  27 }
  28
  29 bool OverlayStrategyCommon::IsOverlayQuad(const DrawQuad* draw_quad) {
  30   unsigned int resource_id;
  31   switch (draw_quad->material) {
  32     case DrawQuad::TEXTURE_CONTENT:
  33       resource_id = TextureDrawQuad::MaterialCast(draw_quad)->resource_id();
  34       break;
  35     case DrawQuad::STREAM_VIDEO_CONTENT:
  36       resource_id = StreamVideoDrawQuad::MaterialCast(draw_quad)->resource_id();
  37       break;
  38     default:
  39       return false;
  40   }
  41   return resource_provider_->AllowOverlay(resource_id);
  42 }
  43
  44 bool OverlayStrategyCommon::IsInvisibleQuad(const DrawQuad* draw_quad) {
  45   if (draw_quad->material == DrawQuad::SOLID_COLOR) {
  46     const SolidColorDrawQuad* solid_quad =
  47         SolidColorDrawQuad::MaterialCast(draw_quad);
  48     SkColor color = solid_quad->color;
  49     float opacity = solid_quad->opacity();
  50     float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
  51     return solid_quad->ShouldDrawWithBlending() &&
  52            alpha < std::numeric_limits<float>::epsilon();
  53   }
  54   return false;
  55 }
  56
  57 bool OverlayStrategyCommon::GetTextureQuadInfo(const TextureDrawQuad& quad,
  58                                                OverlayCandidate* quad_info) {
  59   gfx::OverlayTransform overlay_transform =
  60       OverlayCandidate::GetOverlayTransform(quad.quadTransform(),
  61                                             quad.y_flipped);
  62   if (quad.background_color != SK_ColorTRANSPARENT ||
  63       quad.premultiplied_alpha ||
  64       overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
  65     return false;
  66   quad_info->resource_id = quad.resource_id();
  67   quad_info->transform = overlay_transform;
  68   quad_info->uv_rect = BoundingRect(quad.uv_top_left, quad.uv_bottom_right);
  69   return true;
  70 }
  71
  72 bool OverlayStrategyCommon::GetVideoQuadInfo(const StreamVideoDrawQuad& quad,
  73                                              OverlayCandidate* quad_info) {
  74   gfx::OverlayTransform overlay_transform =
  75       OverlayCandidate::GetOverlayTransform(quad.quadTransform(), false);
  76   if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
  77     return false;
  78   if (!quad.matrix.IsScaleOrTranslation()) {
  79     // We cannot handle anything other than scaling & translation for texture
  80     // coordinates yet.
  81     return false;
  82   }
  83   quad_info->resource_id = quad.resource_id();
  84   quad_info->transform = overlay_transform;
  85
  86   gfx::Point3F uv0 = gfx::Point3F(0, 0, 0);
  87   gfx::Point3F uv1 = gfx::Point3F(1, 1, 0);
  88   quad.matrix.TransformPoint(&uv0);
  89   quad.matrix.TransformPoint(&uv1);
  90   gfx::Vector3dF delta = uv1 - uv0;
  91   if (delta.x() < 0) {
  92     quad_info->transform = OverlayCandidate::ModifyTransform(
  93         quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL);
  94     float x0 = uv0.x();
  95     uv0.set_x(uv1.x());
  96     uv1.set_x(x0);
  97     delta.set_x(-delta.x());
  98   }
  99
 100   if (delta.y() < 0) {
 101     // In this situation, uv0y < uv1y. Since we overlay inverted, a request
 102     // to invert the source texture means we can just output the texture
 103     // normally and it will be correct.
 104     quad_info->uv_rect = gfx::RectF(uv0.x(), uv1.y(), delta.x(), -delta.y());
 105   } else {
 106     quad_info->transform = OverlayCandidate::ModifyTransform(
 107         quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL);
 108     quad_info->uv_rect = gfx::RectF(uv0.x(), uv0.y(), delta.x(), delta.y());
 109   }
 110   return true;
 111 }
 112
 113 bool OverlayStrategyCommon::GetCandidateQuadInfo(const DrawQuad& draw_quad,
 114                                                  OverlayCandidate* quad_info) {
 115   // All quad checks.
 116   if (draw_quad.needs_blending || draw_quad.shared_quad_state->opacity != 1.f ||
 117       draw_quad.shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode)
 118     return false;
 119
 120   if (draw_quad.material == DrawQuad::TEXTURE_CONTENT) {
 121     const TextureDrawQuad& quad = *TextureDrawQuad::MaterialCast(&draw_quad);
 122     if (!GetTextureQuadInfo(quad, quad_info))
 123       return false;
 124   } else if (draw_quad.material == DrawQuad::STREAM_VIDEO_CONTENT) {
 125     const StreamVideoDrawQuad& quad =
 126         *StreamVideoDrawQuad::MaterialCast(&draw_quad);
 127     if (!GetVideoQuadInfo(quad, quad_info))
 128       return false;
 129   }
 130
 131   quad_info->format = RGBA_8888;
 132   quad_info->display_rect = OverlayCandidate::GetOverlayRect(
 133       draw_quad.quadTransform(), draw_quad.rect);
 134   return true;
 135 }
 136
 137 }  // namespace cc