| /* |
| * Copyright 2016 Google Inc. All Rights Reserved. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "cobalt/renderer/rasterizer/skia/scratch_surface_cache.h" |
| |
| #include "cobalt/base/polymorphic_downcast.h" |
| #include "third_party/skia/include/core/SkCanvas.h" |
| |
| namespace cobalt { |
| namespace renderer { |
| namespace rasterizer { |
| namespace skia { |
| |
| namespace { |
| |
| class SkiaSurface : public common::ScratchSurfaceCache::Surface { |
| public: |
| SkiaSurface(SkSurface* surface, const math::Size& size) |
| : surface_(surface), size_(size) {} |
| |
| math::Size GetSize() const OVERRIDE { return size_; } |
| |
| SkSurface* sk_surface() { return surface_.get(); } |
| |
| private: |
| SkAutoTUnref<SkSurface> surface_; |
| math::Size size_; |
| }; |
| } // namespace |
| |
| ScratchSurfaceCache::ScratchSurfaceCache( |
| CreateSkSurfaceFunction create_sk_surface_function, |
| int cache_capacity_in_bytes) |
| : delegate_(create_sk_surface_function), |
| cache_(&delegate_, cache_capacity_in_bytes) {} |
| |
| ScratchSurfaceCache::Delegate::Delegate( |
| CreateSkSurfaceFunction create_sk_surface_function) |
| : create_sk_surface_function_(create_sk_surface_function) {} |
| |
| common::ScratchSurfaceCache::Surface* |
| ScratchSurfaceCache::Delegate::CreateSurface(const math::Size& size) { |
| return new SkiaSurface(create_sk_surface_function_.Run(size), size); |
| } |
| |
| void ScratchSurfaceCache::Delegate::DestroySurface( |
| common::ScratchSurfaceCache::Surface* surface) { |
| delete surface; |
| } |
| |
| void ScratchSurfaceCache::Delegate::PrepareForUse( |
| common::ScratchSurfaceCache::Surface* surface, const math::Size& area) { |
| SkSurface* sk_surface = |
| base::polymorphic_downcast<SkiaSurface*>(surface)->sk_surface(); |
| |
| // Reset the sk_surface's canvas settings such as transform matrix and clip. |
| SkCanvas* canvas = sk_surface->getCanvas(); |
| canvas->restoreToCount(1); |
| // Setup a save marker on the reset canvas so that we can restore this reset |
| // state when re-using the sk_surface. |
| canvas->save(); |
| |
| // Indicate that we do not care about the existing state of the canvas, which |
| // can allow for optimization on tile-based renderers. |
| canvas->discard(); |
| |
| // Setup a clip rect on the sk_surface to the requested area. This can save |
| // us from drawing to pixels outside of the requested area, since the actual |
| // sk_surface returned may be larger than the requested area. |
| canvas->clipRect(SkRect::MakeWH(area.width(), area.height()), |
| SkRegion::kReplace_Op); |
| |
| // Clear the draw area to RGBA(0, 0, 0, 0), as expected for a fresh scratch |
| // sk_surface, before returning. |
| canvas->drawARGB(0, 0, 0, 0, SkXfermode::kClear_Mode); |
| } |
| |
| SkSurface* CachedScratchSurface::GetSurface() { |
| return base::polymorphic_downcast<SkiaSurface*>( |
| common_scratch_surface_.GetSurface()) |
| ->sk_surface(); |
| } |
| |
| } // namespace skia |
| } // namespace rasterizer |
| } // namespace renderer |
| } // namespace cobalt |