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     : capability_checker_(capability_checker) {
  22 }
  23
  24 OverlayStrategyCommon::~OverlayStrategyCommon() {
  25 }
  26
  27 bool OverlayStrategyCommon::Attempt(RenderPassList* render_passes_in_draw_order,
  28                                     OverlayCandidateList* candidate_list) {
  29   if (!capability_checker_)
  30     return false;
  31   RenderPass* root_render_pass = render_passes_in_draw_order->back();
  32   DCHECK(root_render_pass);
  33
  34   QuadList& quad_list = root_render_pass->quad_list;
  35   for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
  36     OverlayCandidate candidate;
  37     const DrawQuad* draw_quad = *it;
  38     if (IsOverlayQuad(draw_quad) &&
  39         GetCandidateQuadInfo(*draw_quad, &candidate) &&
  40         TryOverlay(capability_checker_, render_passes_in_draw_order,
  41                    candidate_list, candidate, it))
  42       return true;
  43   }
  44   return false;
  45 }
  46
  47 bool OverlayStrategyCommon::IsOverlayQuad(const DrawQuad* draw_quad) {
  48   switch (draw_quad->material) {
  49     case DrawQuad::TEXTURE_CONTENT:
  50       return TextureDrawQuad::MaterialCast(draw_quad)->allow_overlay();
  51     case DrawQuad::STREAM_VIDEO_CONTENT:
  52       return StreamVideoDrawQuad::MaterialCast(draw_quad)->allow_overlay();
  53     default:
  54       return false;
  55   }
  56 }
  57
  58 bool OverlayStrategyCommon::IsInvisibleQuad(const DrawQuad* draw_quad) {
  59   if (draw_quad->material == DrawQuad::SOLID_COLOR) {
  60     const SolidColorDrawQuad* solid_quad =
  61         SolidColorDrawQuad::MaterialCast(draw_quad);
  62     SkColor color = solid_quad->color;
  63     float opacity = solid_quad->shared_quad_state->opacity;
  64     float alpha = (SkColorGetA(color) * (1.0f / 255.0f)) * opacity;
  65     return solid_quad->ShouldDrawWithBlending() &&
  66            alpha < std::numeric_limits<float>::epsilon();
  67   }
  68   return false;
  69 }
  70
  71 bool OverlayStrategyCommon::GetTextureQuadInfo(const TextureDrawQuad& quad,
  72                                                OverlayCandidate* quad_info) {
  73   gfx::OverlayTransform overlay_transform =
  74       OverlayCandidate::GetOverlayTransform(
  75           quad.shared_quad_state->quad_to_target_transform, quad.y_flipped);
  76   if (quad.background_color != SK_ColorTRANSPARENT ||
  77       quad.premultiplied_alpha ||
  78       overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
  79     return false;
  80   quad_info->resource_id = quad.resource_id();
  81   quad_info->resource_size_in_pixels = quad.resource_size_in_pixels();
  82   quad_info->transform = overlay_transform;
  83   quad_info->uv_rect = BoundingRect(quad.uv_top_left, quad.uv_bottom_right);
  84   return true;
  85 }
  86
  87 bool OverlayStrategyCommon::GetVideoQuadInfo(const StreamVideoDrawQuad& quad,
  88                                              OverlayCandidate* quad_info) {
  89   gfx::OverlayTransform overlay_transform =
  90       OverlayCandidate::GetOverlayTransform(
  91           quad.shared_quad_state->quad_to_target_transform, false);
  92   if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
  93     return false;
  94   if (!quad.matrix.IsScaleOrTranslation()) {
  95     // We cannot handle anything other than scaling & translation for texture
  96     // coordinates yet.
  97     return false;
  98   }
  99   quad_info->resource_id = quad.resource_id();
 100   quad_info->resource_size_in_pixels = quad.resource_size_in_pixels();
 101   quad_info->transform = overlay_transform;
 102
 103   gfx::Point3F uv0 = gfx::Point3F(0, 0, 0);
 104   gfx::Point3F uv1 = gfx::Point3F(1, 1, 0);
 105   quad.matrix.TransformPoint(&uv0);
 106   quad.matrix.TransformPoint(&uv1);
 107   gfx::Vector3dF delta = uv1 - uv0;
 108   if (delta.x() < 0) {
 109     quad_info->transform = OverlayCandidate::ModifyTransform(
 110         quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL);
 111     float x0 = uv0.x();
 112     uv0.set_x(uv1.x());
 113     uv1.set_x(x0);
 114     delta.set_x(-delta.x());
 115   }
 116
 117   if (delta.y() < 0) {
 118     // In this situation, uv0y < uv1y. Since we overlay inverted, a request
 119     // to invert the source texture means we can just output the texture
 120     // normally and it will be correct.
 121     quad_info->uv_rect = gfx::RectF(uv0.x(), uv1.y(), delta.x(), -delta.y());
 122   } else {
 123     quad_info->transform = OverlayCandidate::ModifyTransform(
 124         quad_info->transform, gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL);
 125     quad_info->uv_rect = gfx::RectF(uv0.x(), uv0.y(), delta.x(), delta.y());
 126   }
 127   return true;
 128 }
 129
 130 bool OverlayStrategyCommon::GetCandidateQuadInfo(const DrawQuad& draw_quad,
 131                                                  OverlayCandidate* quad_info) {
 132   // All quad checks.
 133   if (draw_quad.needs_blending || draw_quad.shared_quad_state->opacity != 1.f ||
 134       draw_quad.shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode)
 135     return false;
 136
 137   if (draw_quad.material == DrawQuad::TEXTURE_CONTENT) {
 138     const TextureDrawQuad& quad = *TextureDrawQuad::MaterialCast(&draw_quad);
 139     if (!GetTextureQuadInfo(quad, quad_info))
 140       return false;
 141   } else if (draw_quad.material == DrawQuad::STREAM_VIDEO_CONTENT) {
 142     const StreamVideoDrawQuad& quad =
 143         *StreamVideoDrawQuad::MaterialCast(&draw_quad);
 144     if (!GetVideoQuadInfo(quad, quad_info))
 145       return false;
 146   }
 147
 148   quad_info->format = RGBA_8888;
 149   quad_info->display_rect = OverlayCandidate::GetOverlayRect(
 150       draw_quad.shared_quad_state->quad_to_target_transform, draw_quad.rect);
 151   return true;
 152 }
 153
 154 }  // namespace cc