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/*
* 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.
*/
#ifndef COBALT_RENDERER_RASTERIZER_BLITTER_SCRATCH_SURFACE_CACHE_H_
#define COBALT_RENDERER_RASTERIZER_BLITTER_SCRATCH_SURFACE_CACHE_H_
#include "cobalt/math/size.h"
#include "cobalt/renderer/rasterizer/common/scratch_surface_cache.h"
#include "starboard/blitter.h"
#if SB_HAS(BLITTER)
namespace cobalt {
namespace renderer {
namespace rasterizer {
namespace blitter {
// We define a blitter::ScratchSurfaceCache class here that decorates
// common::ScratchSurfaceCache by customizing it to be Blitter API specific.
// A Blitter API renderer can use this class to request temporary scratch
// SbBlitterSurfaces that can be automatically re-used over the course of a
// frame. CachedScratchSurface objects must be created in order to actually
// interact with ScratchSurfaceCache.
class ScratchSurfaceCache {
public:
// |device| specifies the |device| from which surfaces should be allocated
// from and |context| specifies which context to use when draw commands need
// to be issued (e.g. to clear a surface so it is ready for use).
ScratchSurfaceCache(SbBlitterDevice device, SbBlitterContext context,
int cache_capacity_in_bytes);
private:
class Delegate : public common::ScratchSurfaceCache::Delegate {
public:
Delegate(SbBlitterDevice device, SbBlitterContext context);
common::ScratchSurfaceCache::Surface* CreateSurface(
const math::Size& size) OVERRIDE;
void DestroySurface(common::ScratchSurfaceCache::Surface* surface) OVERRIDE;
void PrepareForUse(common::ScratchSurfaceCache::Surface* surface,
const math::Size& area) OVERRIDE;
private:
SbBlitterDevice device_;
SbBlitterContext context_;
};
Delegate delegate_;
common::ScratchSurfaceCache cache_;
friend class CachedScratchSurface;
};
// This class acts as the interface to ScratchSurfaceCache. It does so by
// decorating common::CachedScratchSurface and adding methods to obtain
// a reference to the Blitter API-specific SbBlitterSurface object.
class CachedScratchSurface {
public:
CachedScratchSurface(ScratchSurfaceCache* cache, const math::Size& size)
: common_scratch_surface_(&cache->cache_, size) {}
// Returns a pointer to the Blitter surface.
SbBlitterSurface GetSurface();
private:
common::CachedScratchSurface common_scratch_surface_;
};
} // namespace blitter
} // namespace rasterizer
} // namespace renderer
} // namespace cobalt
#endif // SB_HAS(BLITTER)
#endif // COBALT_RENDERER_RASTERIZER_BLITTER_SCRATCH_SURFACE_CACHE_H_