cc: Fork OverlayCandidate to CALayerOverlay

cc/output/ca_layer_overlay.cc

+// Copyright 2015 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/ca_layer_overlay.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 "cc/quads/tile_draw_quad.h"
+#include "cc/resources/resource_provider.h"
+
+namespace cc {
+
+namespace {
+
+bool FromIOSurfaceQuad(ResourceProvider* resource_provider,

[alexst (slow to review), 2015/11/12 14:36:18]

const ResourceProvider? I don't see anything changing it. ditto below.

[ccameron, 2015/11/12 17:31:47]

It's true -- ResourceProvider has lots of const-correctness issues (see
GetResourceType, GetResourceTextureTarget, IsOverlayCandidate, et al). Probably
worth fixing, but might be a big change to roll into this one.

+                       const IOSurfaceDrawQuad* quad,
+                       CALayerOverlay* ca_layer_overlay) {
+  unsigned resource_id = quad->io_surface_resource_id();
+  if (!resource_provider->IsOverlayCandidate(resource_id))
+    return false;
+  ca_layer_overlay->contents_resource_id = resource_id;
+  ca_layer_overlay->contents_rect = gfx::RectF(0, 0, 1, 1);
+  return true;
+}
+
+bool FromStreamVideoQuad(ResourceProvider* resource_provider,
+                         const StreamVideoDrawQuad* quad,
+                         CALayerOverlay* ca_layer_overlay) {
+  unsigned resource_id = quad->resource_id();
+  if (!resource_provider->IsOverlayCandidate(resource_id))
+    return false;
+  ca_layer_overlay->contents_resource_id = resource_id;
+  // TODO(ccameron): Support merging at least some basic transforms into the
+  // layer transform.
+  if (!quad->matrix.IsIdentity())
+    return false;
+  ca_layer_overlay->contents_rect = gfx::RectF(0, 0, 1, 1);
+  return true;
+}
+
+bool FromSolidColorDrawQuad(const SolidColorDrawQuad* quad,
+                            CALayerOverlay* ca_layer_overlay,
+                            bool* skip) {
+  // Do not generate quads that are completely transparent.
+  if (SkColorGetA(quad->color) == 0) {
+    *skip = true;
+    return true;
+  }
+  ca_layer_overlay->background_color = quad->color;
+  return true;
+}
+
+bool FromTextureQuad(ResourceProvider* resource_provider,
+                     const TextureDrawQuad* quad,
+                     CALayerOverlay* ca_layer_overlay) {
+  unsigned resource_id = quad->resource_id();
+  if (!resource_provider->IsOverlayCandidate(resource_id))
+    return false;
+  // TODO(ccameron): Merge the y flip into the layer transform.
+  if (quad->y_flipped)
+    return false;
+  ca_layer_overlay->contents_resource_id = resource_id;
+  ca_layer_overlay->contents_rect =
+      BoundingRect(quad->uv_top_left, quad->uv_bottom_right);
+  ca_layer_overlay->background_color = quad->background_color;
+  return true;
+}
+
+bool FromTileQuad(ResourceProvider* resource_provider,
+                  const TileDrawQuad* quad,
+                  CALayerOverlay* ca_layer_overlay) {
+  unsigned resource_id = quad->resource_id();
+  if (!resource_provider->IsOverlayCandidate(resource_id))
+    return false;
+  ca_layer_overlay->contents_resource_id = resource_id;
+  ca_layer_overlay->contents_rect = quad->tex_coord_rect;
+  ca_layer_overlay->contents_rect.Scale(1.f / quad->texture_size.width(),
+                                        1.f / quad->texture_size.height());
+  return true;
+}
+
+bool FromDrawQuad(ResourceProvider* resource_provider,
+                  const gfx::RectF& display_rect,
+                  const DrawQuad* quad,
+                  CALayerOverlay* ca_layer_overlay,
+                  bool* skip) {
+  if (quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode)
+    return false;
+
+  // TODO(ccameron): Handle 3D transforms.
+  if (!quad->shared_quad_state->quad_to_target_transform.IsFlat())
+    return false;
+
+  // Early-out for invisible quads.
+  if (quad->shared_quad_state->opacity == 0.f) {
+    *skip = true;
+    return true;
+  }
+
+  // Check rect clipping.
+  gfx::RectF quad_rect(quad->rect);
+  if (quad->shared_quad_state->is_clipped) {
+    gfx::RectF clip_rect = gfx::RectF(quad->shared_quad_state->clip_rect);
+    gfx::RectF quad_rect_in_clip_space = gfx::RectF(quad->rect);
+    quad->shared_quad_state->quad_to_target_transform.TransformRect(
+        &quad_rect_in_clip_space);
+    quad_rect_in_clip_space.Intersect(display_rect);
+    // Skip quads that are entirely clipped.
+    if (!quad_rect_in_clip_space.Intersects(clip_rect)) {
+      *skip = true;
+      return true;
+    }
+    // Fall back if the clip rect actually has an effect.
+    // TODO(ccameron): Handle more clip rects.
+    if (!clip_rect.Contains(quad_rect_in_clip_space)) {
+      return false;
+    }
+  }
+
+  ca_layer_overlay->opacity = quad->shared_quad_state->opacity;
+  ca_layer_overlay->bounds_size = gfx::SizeF(quad->rect.size());
+  ca_layer_overlay->transform.setTranslate(quad->rect.x(), quad->rect.y(), 0);
+  ca_layer_overlay->transform.postConcat(
+      quad->shared_quad_state->quad_to_target_transform.matrix());
+
+  switch (quad->material) {
+    case DrawQuad::IO_SURFACE_CONTENT:
+      return FromIOSurfaceQuad(resource_provider,
+                               IOSurfaceDrawQuad::MaterialCast(quad),
+                               ca_layer_overlay);
+    case DrawQuad::TEXTURE_CONTENT:
+      return FromTextureQuad(resource_provider,
+                             TextureDrawQuad::MaterialCast(quad),
+                             ca_layer_overlay);
+    case DrawQuad::TILED_CONTENT:
+      return FromTileQuad(resource_provider, TileDrawQuad::MaterialCast(quad),
+                          ca_layer_overlay);
+    case DrawQuad::SOLID_COLOR:
+      return FromSolidColorDrawQuad(SolidColorDrawQuad::MaterialCast(quad),
+                                    ca_layer_overlay, skip);
+    case DrawQuad::STREAM_VIDEO_CONTENT:
+      return FromStreamVideoQuad(resource_provider,
+                                 StreamVideoDrawQuad::MaterialCast(quad),
+                                 ca_layer_overlay);
+    default:
+      return false;
+      break;
+  }
+
+  return true;
+}
+
+}  // namespace
+
+CALayerOverlay::CALayerOverlay()
+    : contents_resource_id(0),
+      opacity(1),
+      background_color(SK_ColorTRANSPARENT),
+      transform(SkMatrix44::kIdentity_Constructor) {}
+
+CALayerOverlay::~CALayerOverlay() {}
+
+bool ProcessForCALayerOverlays(ResourceProvider* resource_provider,
+                               const gfx::RectF& display_rect,
+                               const QuadList& quad_list,
+                               CALayerOverlayList* ca_layer_overlays) {
+  for (auto it = quad_list.BackToFrontBegin(); it != quad_list.BackToFrontEnd();
+       ++it) {
+    const DrawQuad* quad = *it;
+    CALayerOverlay ca_layer_overlay;
+    bool skip = false;
+    if (!FromDrawQuad(resource_provider, display_rect, quad, &ca_layer_overlay,
+                      &skip)) {
+      ca_layer_overlays->clear();
+      return false;
+    }
+    if (skip)
+      continue;
+    ca_layer_overlays->push_back(ca_layer_overlay);
+  }
+  return true;
+}
+
+}  // namespace cc