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1 // Copyright 2011 The Chromium Authors. All rights reserved. | 1 // Copyright 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "cc/trees/layer_tree_host_common.h" | 5 #include "cc/trees/layer_tree_host_common.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/debug/trace_event.h" | 9 #include "base/debug/trace_event.h" |
10 #include "cc/base/math_util.h" | 10 #include "cc/base/math_util.h" |
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580 if (LayerIsInExisting3DRenderingContext(layer) && !layer->preserves_3d() && | 580 if (LayerIsInExisting3DRenderingContext(layer) && !layer->preserves_3d() && |
581 num_descendants_that_draw_content > 0) { | 581 num_descendants_that_draw_content > 0) { |
582 TRACE_EVENT_INSTANT0( | 582 TRACE_EVENT_INSTANT0( |
583 "cc", | 583 "cc", |
584 "LayerTreeHostCommon::SubtreeShouldRenderToSeparateSurface flattening", | 584 "LayerTreeHostCommon::SubtreeShouldRenderToSeparateSurface flattening", |
585 TRACE_EVENT_SCOPE_THREAD); | 585 TRACE_EVENT_SCOPE_THREAD); |
586 DCHECK(!is_root); | 586 DCHECK(!is_root); |
587 return true; | 587 return true; |
588 } | 588 } |
589 | 589 |
590 // If the layer has blending. | |
591 // TODO(rosca): this is temporary, until blending is implemented for other | |
592 // types of quads than RenderPassQuad. Layers having descendants that draw | |
593 // content will still create a separate rendering surface. | |
594 if (!layer->uses_default_blend_mode()) { | |
595 TRACE_EVENT_INSTANT0( | |
596 "cc", | |
597 "LayerTreeHostCommon::SubtreeShouldRenderToSeparateSurface blending", | |
598 TRACE_EVENT_SCOPE_THREAD); | |
599 DCHECK(!is_root); | |
600 return true; | |
601 } | |
602 | |
603 // If the layer has isolation. | |
604 // TODO(rosca): to be optimized - create separate rendering surface only when | |
605 // the blending descendants might have access to the content behind this layer | |
606 // (layer has transparent background or descendants overflow) | |
607 // https://code.google.com/p/chromium/issues/detail?id=301738 | |
608 if (layer->is_root_for_isolated_group()) { | |
609 TRACE_EVENT_INSTANT0( | |
610 "cc", | |
611 "LayerTreeHostCommon::SubtreeShouldRenderToSeparateSurface isolation", | |
612 TRACE_EVENT_SCOPE_THREAD); | |
613 DCHECK(!is_root); | |
enne (OOO)
2013/11/06 22:40:19
Why can't this be the root? In the cases above, we
rosca
2013/11/07 01:58:16
Agree. Done.
| |
614 return true; | |
615 } | |
616 | |
590 // If the layer clips its descendants but it is not axis-aligned with respect | 617 // If the layer clips its descendants but it is not axis-aligned with respect |
591 // to its parent. | 618 // to its parent. |
592 bool layer_clips_external_content = | 619 bool layer_clips_external_content = |
593 LayerClipsSubtree(layer) || layer->HasDelegatedContent(); | 620 LayerClipsSubtree(layer) || layer->HasDelegatedContent(); |
594 if (layer_clips_external_content && !axis_aligned_with_respect_to_parent && | 621 if (layer_clips_external_content && !axis_aligned_with_respect_to_parent && |
595 num_descendants_that_draw_content > 0) { | 622 num_descendants_that_draw_content > 0) { |
596 TRACE_EVENT_INSTANT0( | 623 TRACE_EVENT_INSTANT0( |
597 "cc", | 624 "cc", |
598 "LayerTreeHostCommon::SubtreeShouldRenderToSeparateSurface clipping", | 625 "LayerTreeHostCommon::SubtreeShouldRenderToSeparateSurface clipping", |
599 TRACE_EVENT_SCOPE_THREAD); | 626 TRACE_EVENT_SCOPE_THREAD); |
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2041 clipped_content_rect.set_width( | 2068 clipped_content_rect.set_width( |
2042 std::min(clipped_content_rect.width(), globals.max_texture_size)); | 2069 std::min(clipped_content_rect.width(), globals.max_texture_size)); |
2043 clipped_content_rect.set_height( | 2070 clipped_content_rect.set_height( |
2044 std::min(clipped_content_rect.height(), globals.max_texture_size)); | 2071 std::min(clipped_content_rect.height(), globals.max_texture_size)); |
2045 | 2072 |
2046 if (clipped_content_rect.IsEmpty()) { | 2073 if (clipped_content_rect.IsEmpty()) { |
2047 RemoveSurfaceForEarlyExit(layer, render_surface_layer_list); | 2074 RemoveSurfaceForEarlyExit(layer, render_surface_layer_list); |
2048 return; | 2075 return; |
2049 } | 2076 } |
2050 | 2077 |
2078 // Layers having a non-default blend mode will blend with the content | |
2079 // inside its parent's render target. This render target should be | |
2080 // either root_for_isolated_group, or the root of the layer tree. | |
2081 // Otherwise, this layer will use an incomplete backdrop, limited to its | |
2082 // render target and the blending result will be incorrect. | |
2083 DCHECK(layer->uses_default_blend_mode() || !layer->parent() || | |
2084 !layer->parent()->render_target() || | |
2085 IsRootLayer(layer->parent()->render_target()) || | |
2086 layer->parent()->render_target()->is_root_for_isolated_group()); | |
2087 | |
2051 render_surface->SetContentRect(clipped_content_rect); | 2088 render_surface->SetContentRect(clipped_content_rect); |
2052 | 2089 |
2053 // The owning layer's screen_space_transform has a scale from content to | 2090 // The owning layer's screen_space_transform has a scale from content to |
2054 // layer space which we need to undo and replace with a scale from the | 2091 // layer space which we need to undo and replace with a scale from the |
2055 // surface's subtree into layer space. | 2092 // surface's subtree into layer space. |
2056 gfx::Transform screen_space_transform = layer->screen_space_transform(); | 2093 gfx::Transform screen_space_transform = layer->screen_space_transform(); |
2057 screen_space_transform.Scale( | 2094 screen_space_transform.Scale( |
2058 layer->contents_scale_x() / render_surface_sublayer_scale.x(), | 2095 layer->contents_scale_x() / render_surface_sublayer_scale.x(), |
2059 layer->contents_scale_y() / render_surface_sublayer_scale.y()); | 2096 layer->contents_scale_y() / render_surface_sublayer_scale.y()); |
2060 render_surface->SetScreenSpaceTransform(screen_space_transform); | 2097 render_surface->SetScreenSpaceTransform(screen_space_transform); |
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2415 // At this point, we think the point does hit the touch event handler region | 2452 // At this point, we think the point does hit the touch event handler region |
2416 // on the layer, but we need to walk up the parents to ensure that the layer | 2453 // on the layer, but we need to walk up the parents to ensure that the layer |
2417 // was not clipped in such a way that the hit point actually should not hit | 2454 // was not clipped in such a way that the hit point actually should not hit |
2418 // the layer. | 2455 // the layer. |
2419 if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl)) | 2456 if (PointIsClippedBySurfaceOrClipRect(screen_space_point, layer_impl)) |
2420 return false; | 2457 return false; |
2421 | 2458 |
2422 return true; | 2459 return true; |
2423 } | 2460 } |
2424 } // namespace cc | 2461 } // namespace cc |
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