Mac Overlays: Add AllOrNothing strategy

cc/output/overlay_candidate.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/overlay_candidate.h"
 
 #include <algorithm>
 #include <limits>
 #include "base/logging.h"
 #include "cc/base/math_util.h"
+#include "cc/quads/io_surface_draw_quad.h"
+#include "cc/quads/solid_color_draw_quad.h"
+#include "cc/quads/stream_video_draw_quad.h"
+#include "cc/quads/texture_draw_quad.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/vector3d_f.h"
 
 namespace cc {
 
 namespace {
 // Tolerance for considering axis vector elements to be zero.
 const SkMScalar kEpsilon = std::numeric_limits<float>::epsilon();
 
 enum Axis { NONE, AXIS_POS_X, AXIS_NEG_X, AXIS_POS_Y, AXIS_NEG_Y };
@@ skipping 19 matching lines @@
       uv_rect(0.f, 0.f, 1.f, 1.f),
       is_clipped(false),
       use_output_surface_for_resource(false),
       resource_id(0),
       plane_z_order(0),
       overlay_handled(false) {}
 
 OverlayCandidate::~OverlayCandidate() {}
 
 // static
+bool OverlayCandidate::FromDrawQuad(const DrawQuad* quad,
+                                    OverlayCandidate* candidate) {
+  if (quad->needs_blending || quad->shared_quad_state->opacity != 1.f ||
+      quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode)
+    return false;
+
+  candidate->format = RGBA_8888;
+  candidate->display_rect = GetOverlayRect(

[ccameron, 2015/09/29 23:29:55]

Remove GetOverlayRect as a function and make it inline here -- having it next to
quad_rect_in_target_space will drive home the point that they two are the same.

[Andre, 2015/09/30 00:18:38]

Done.

+      quad->shared_quad_state->quad_to_target_transform, quad->rect);
+  candidate->quad_rect_in_target_space = MathUtil::MapEnclosingClippedRect(
+      quad->shared_quad_state->quad_to_target_transform, quad->rect);
+  candidate->clip_rect = quad->shared_quad_state->clip_rect;
+  candidate->is_clipped = quad->shared_quad_state->is_clipped;
+
+  switch (quad->material) {
+    case DrawQuad::TEXTURE_CONTENT:
+      return FromTextureQuad(TextureDrawQuad::MaterialCast(quad), candidate);
+    case DrawQuad::STREAM_VIDEO_CONTENT:
+      return FromStreamVideoQuad(StreamVideoDrawQuad::MaterialCast(quad),
+                                 candidate);
+    case DrawQuad::IO_SURFACE_CONTENT:
+      return FromIOSurfaceQuad(IOSurfaceDrawQuad::MaterialCast(quad),
+                               candidate);
+    default:
+      break;
+  }
+
+  return false;
+}
+
+// static
+bool OverlayCandidate::FromTextureQuad(const TextureDrawQuad* quad,
+                                       OverlayCandidate* candidate) {
+  if (!quad->allow_overlay())
+    return false;
+  gfx::OverlayTransform overlay_transform = GetOverlayTransform(
+      quad->shared_quad_state->quad_to_target_transform, quad->y_flipped);
+  if (quad->background_color != SK_ColorTRANSPARENT ||
+      quad->premultiplied_alpha ||
+      overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
+    return false;
+  candidate->resource_id = quad->resource_id();
+  candidate->resource_size_in_pixels = quad->resource_size_in_pixels();
+  candidate->transform = overlay_transform;
+  candidate->uv_rect = BoundingRect(quad->uv_top_left, quad->uv_bottom_right);
+  return true;
+}
+
+// static
+bool OverlayCandidate::FromStreamVideoQuad(const StreamVideoDrawQuad* quad,
+                                           OverlayCandidate* candidate) {
+  if (!quad->allow_overlay())
+    return false;
+  gfx::OverlayTransform overlay_transform = GetOverlayTransform(
+      quad->shared_quad_state->quad_to_target_transform, false);
+  if (overlay_transform == gfx::OVERLAY_TRANSFORM_INVALID)
+    return false;
+  if (!quad->matrix.IsScaleOrTranslation()) {
+    // We cannot handle anything other than scaling & translation for texture
+    // coordinates yet.
+    return false;
+  }
+  candidate->resource_id = quad->resource_id();
+  candidate->resource_size_in_pixels = quad->resource_size_in_pixels();
+  candidate->transform = overlay_transform;
+
+  gfx::Point3F uv0 = gfx::Point3F(0, 0, 0);
+  gfx::Point3F uv1 = gfx::Point3F(1, 1, 0);
+  quad->matrix.TransformPoint(&uv0);
+  quad->matrix.TransformPoint(&uv1);
+  gfx::Vector3dF delta = uv1 - uv0;
+  if (delta.x() < 0) {
+    candidate->transform = ModifyTransform(
+        candidate->transform, gfx::OVERLAY_TRANSFORM_FLIP_HORIZONTAL);
+    float x0 = uv0.x();
+    uv0.set_x(uv1.x());
+    uv1.set_x(x0);
+    delta.set_x(-delta.x());
+  }
+
+  if (delta.y() < 0) {
+    // In this situation, uv0y < uv1y. Since we overlay inverted, a request
+    // to invert the source texture means we can just output the texture
+    // normally and it will be correct.
+    candidate->uv_rect = gfx::RectF(uv0.x(), uv1.y(), delta.x(), -delta.y());
+  } else {
+    candidate->transform = ModifyTransform(
+        candidate->transform, gfx::OVERLAY_TRANSFORM_FLIP_VERTICAL);
+    candidate->uv_rect = gfx::RectF(uv0.x(), uv0.y(), delta.x(), delta.y());
+  }
+  return true;
+}
+
+// static
+bool OverlayCandidate::FromIOSurfaceQuad(const IOSurfaceDrawQuad* quad,
+                                         OverlayCandidate* candidate) {
+  if (!quad->allow_overlay)
+    return false;
+  gfx::OverlayTransform overlay_transform = GetOverlayTransform(
+      quad->shared_quad_state->quad_to_target_transform, false);
+  if (overlay_transform != gfx::OVERLAY_TRANSFORM_NONE)
+    return false;
+  candidate->resource_id = quad->io_surface_resource_id();
+  candidate->resource_size_in_pixels = quad->io_surface_size;
+  candidate->transform = overlay_transform;
+  candidate->uv_rect = gfx::RectF(1.f, 1.f);
+  return true;
+}
+
+// static
 gfx::OverlayTransform OverlayCandidate::GetOverlayTransform(
     const gfx::Transform& quad_transform,
     bool y_flipped) {
   if (!quad_transform.Preserves2dAxisAlignment()) {
     return gfx::OVERLAY_TRANSFORM_INVALID;
   }
 
   gfx::Vector3dF x_axis = MathUtil::GetXAxis(quad_transform);
   gfx::Vector3dF y_axis = MathUtil::GetYAxis(quad_transform);
   if (y_flipped) {
@@ skipping 120 matching lines @@
     const gfx::Transform& quad_transform,
     const gfx::Rect& rect) {
   DCHECK(quad_transform.Preserves2dAxisAlignment());
 
   gfx::RectF float_rect(rect);
   quad_transform.TransformRect(&float_rect);
   return float_rect;
 }
 
 }  // namespace cc