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