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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrAtlas.h"
#include "GrGpu.h"
#include "GrLayerCache.h"
/**
* PictureLayerKey just wraps a saveLayer's id in the picture for GrTHashTable.
*/
class GrLayerCache::PictureLayerKey {
public:
PictureLayerKey(uint32_t pictureID, int layerID)
: fPictureID(pictureID)
, fLayerID(layerID) {
}
uint32_t pictureID() const { return fPictureID; }
int layerID() const { return fLayerID; }
uint32_t getHash() const { return (fPictureID << 16) | fLayerID; }
static bool LessThan(const GrCachedLayer& layer, const PictureLayerKey& key) {
if (layer.pictureID() == key.pictureID()) {
return layer.layerID() < key.layerID();
}
return layer.pictureID() < key.pictureID();
}
static bool Equals(const GrCachedLayer& layer, const PictureLayerKey& key) {
return layer.pictureID() == key.pictureID() && layer.layerID() == key.layerID();
}
private:
uint32_t fPictureID;
int fLayerID;
};
GrLayerCache::GrLayerCache(GrContext* context)
: fContext(context)
, fLayerPool(16) { // TODO: may need to increase this later
}
GrLayerCache::~GrLayerCache() {
}
void GrLayerCache::init() {
static const int kAtlasTextureWidth = 1024;
static const int kAtlasTextureHeight = 1024;
SkASSERT(NULL == fAtlas.get());
// The layer cache only gets 1 plot
SkISize textureSize = SkISize::Make(kAtlasTextureWidth, kAtlasTextureHeight);
fAtlas.reset(SkNEW_ARGS(GrAtlas, (fContext->getGpu(), kSkia8888_GrPixelConfig,
textureSize, 1, 1, false)));
}
void GrLayerCache::freeAll() {
fLayerHash.deleteAll();
fAtlas.free();
}
GrCachedLayer* GrLayerCache::createLayer(const SkPicture* picture, int layerID) {
GrCachedLayer* layer = fLayerPool.alloc();
SkASSERT(picture->uniqueID() != SK_InvalidGenID);
layer->init(picture->uniqueID(), layerID);
fLayerHash.insert(PictureLayerKey(picture->uniqueID(), layerID), layer);
return layer;
}
GrCachedLayer* GrLayerCache::findLayer(const SkPicture* picture, int layerID) {
SkASSERT(picture->uniqueID() != SK_InvalidGenID);
return fLayerHash.find(PictureLayerKey(picture->uniqueID(), layerID));
}
GrCachedLayer* GrLayerCache::findLayerOrCreate(const SkPicture* picture, int layerID) {
SkASSERT(picture->uniqueID() != SK_InvalidGenID);
GrCachedLayer* layer = fLayerHash.find(PictureLayerKey(picture->uniqueID(), layerID));
if (NULL == layer) {
layer = this->createLayer(picture, layerID);
}
return layer;
}
bool GrLayerCache::lock(GrCachedLayer* layer, const GrTextureDesc& desc) {
SkASSERT(NULL == layer->getTexture());
// This just uses scratch textures and doesn't cache the texture.
// This can yield a lot of re-rendering
layer->setTexture(fContext->lockAndRefScratchTexture(desc, GrContext::kApprox_ScratchTexMatch));
return false;
}
void GrLayerCache::unlock(GrCachedLayer* layer) {
if (NULL == layer || NULL == layer->getTexture()) {
return;
}
fContext->unlockScratchTexture(layer->getTexture());
layer->setTexture(NULL);
}
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