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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"
#include "GrSurfacePriv.h"
DECLARE_SKMESSAGEBUS_MESSAGE(GrPictureDeletedMessage);
#ifdef SK_DEBUG
void GrCachedLayer::validate(const GrTexture* backingTexture) const {
SkASSERT(SK_InvalidGenID != fKey.pictureID());
SkASSERT(fKey.start() >= 0);
if (fTexture) {
// If the layer is in some texture then it must occupy some rectangle
SkASSERT(!fRect.isEmpty());
if (!this->isAtlased()) {
// If it isn't atlased then the rectangle should start at the origin
SkASSERT(0.0f == fRect.fLeft && 0.0f == fRect.fTop);
}
} else {
SkASSERT(fRect.isEmpty());
SkASSERT(NULL == fPlot);
SkASSERT(!fLocked); // layers without a texture cannot be locked
}
if (fPlot) {
// If a layer has a plot (i.e., is atlased) then it must point to
// the backing texture. Additionally, its rect should be non-empty.
SkASSERT(fTexture && backingTexture == fTexture);
SkASSERT(!fRect.isEmpty());
}
if (fLocked) {
// If a layer is locked it must have a texture (though it need not be
// the atlas-backing texture) and occupy some space.
SkASSERT(fTexture);
SkASSERT(!fRect.isEmpty());
}
// Unfortunately there is a brief time where a layer can be locked
// but not used, so we can only check the "used implies locked"
// invariant.
if (fUses > 0) {
SkASSERT(fLocked);
} else {
SkASSERT(0 == fUses);
}
}
class GrAutoValidateLayer : ::SkNoncopyable {
public:
GrAutoValidateLayer(GrTexture* backingTexture, const GrCachedLayer* layer)
: fBackingTexture(backingTexture)
, fLayer(layer) {
if (fLayer) {
fLayer->validate(backingTexture);
}
}
~GrAutoValidateLayer() {
if (fLayer) {
fLayer->validate(fBackingTexture);
}
}
void setBackingTexture(GrTexture* backingTexture) {
SkASSERT(NULL == fBackingTexture || fBackingTexture == backingTexture);
fBackingTexture = backingTexture;
}
private:
const GrTexture* fBackingTexture;
const GrCachedLayer* fLayer;
};
#endif
GrLayerCache::GrLayerCache(GrContext* context)
: fContext(context) {
this->initAtlas();
memset(fPlotLocks, 0, sizeof(fPlotLocks));
}
GrLayerCache::~GrLayerCache() {
SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::Iter iter(&fLayerHash);
for (; !iter.done(); ++iter) {
GrCachedLayer* layer = &(*iter);
SkASSERT(0 == layer->uses());
this->unlock(layer);
SkDELETE(layer);
}
// The atlas only lets go of its texture when the atlas is deleted.
fAtlas.free();
}
void GrLayerCache::initAtlas() {
SkASSERT(NULL == fAtlas.get());
SkISize textureSize = SkISize::Make(kAtlasTextureWidth, kAtlasTextureHeight);
fAtlas.reset(SkNEW_ARGS(GrAtlas, (fContext->getGpu(), kSkia8888_GrPixelConfig,
kRenderTarget_GrTextureFlagBit,
textureSize, kNumPlotsX, kNumPlotsY, false)));
}
void GrLayerCache::freeAll() {
SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::Iter iter(&fLayerHash);
for (; !iter.done(); ++iter) {
GrCachedLayer* layer = &(*iter);
this->unlock(layer);
SkDELETE(layer);
}
fLayerHash.rewind();
// The atlas only lets go of its texture when the atlas is deleted.
fAtlas.free();
// GrLayerCache always assumes an atlas exists so recreate it. The atlas
// lazily allocates a replacement texture so reallocating a new
// atlas here won't disrupt a GrContext::abandonContext or freeGpuResources.
// TODO: Make GrLayerCache lazily allocate the atlas manager?
this->initAtlas();
}
GrCachedLayer* GrLayerCache::createLayer(uint32_t pictureID,
int start, int stop,
const SkMatrix& ctm,
const SkPaint* paint) {
SkASSERT(pictureID != SK_InvalidGenID && start >= 0 && stop > 0);
GrCachedLayer* layer = SkNEW_ARGS(GrCachedLayer, (pictureID, start, stop, ctm, paint));
fLayerHash.add(layer);
return layer;
}
GrCachedLayer* GrLayerCache::findLayer(uint32_t pictureID,
int start,
const SkMatrix& ctm) {
SkASSERT(pictureID != SK_InvalidGenID && start > 0);
return fLayerHash.find(GrCachedLayer::Key(pictureID, start, ctm));
}
GrCachedLayer* GrLayerCache::findLayerOrCreate(uint32_t pictureID,
int start, int stop,
const SkMatrix& ctm,
const SkPaint* paint) {
SkASSERT(pictureID != SK_InvalidGenID && start >= 0 && stop > 0);
GrCachedLayer* layer = fLayerHash.find(GrCachedLayer::Key(pictureID, start, ctm));
if (NULL == layer) {
layer = this->createLayer(pictureID, start, stop, ctm, paint);
}
return layer;
}
bool GrLayerCache::lock(GrCachedLayer* layer, const GrTextureDesc& desc, bool dontAtlas) {
SkDEBUGCODE(GrAutoValidateLayer avl(fAtlas->getTexture(), layer);)
if (layer->locked()) {
// This layer is already locked
#ifdef SK_DEBUG
if (layer->isAtlased()) {
// It claims to be atlased
SkASSERT(!dontAtlas);
SkASSERT(layer->rect().width() == desc.fWidth);
SkASSERT(layer->rect().height() == desc.fHeight);
}
#endif
return false;
}
if (layer->isAtlased()) {
// Hooray it is still in the atlas - make sure it stays there
SkASSERT(!dontAtlas);
layer->setLocked(true);
this->incPlotLock(layer->plot()->id());
return false;
} else if (!dontAtlas && PlausiblyAtlasable(desc.fWidth, desc.fHeight)) {
// Not in the atlas - will it fit?
GrPictureInfo* pictInfo = fPictureHash.find(layer->pictureID());
if (NULL == pictInfo) {
pictInfo = SkNEW_ARGS(GrPictureInfo, (layer->pictureID()));
fPictureHash.add(pictInfo);
}
SkIPoint16 loc;
for (int i = 0; i < 2; ++i) { // extra pass in case we fail to add but are able to purge
GrPlot* plot = fAtlas->addToAtlas(&pictInfo->fPlotUsage,
desc.fWidth, desc.fHeight,
NULL, &loc);
// addToAtlas can allocate the backing texture
SkDEBUGCODE(avl.setBackingTexture(fAtlas->getTexture()));
if (plot) {
// The layer was successfully added to the atlas
GrIRect16 bounds = GrIRect16::MakeXYWH(loc.fX, loc.fY,
SkToS16(desc.fWidth),
SkToS16(desc.fHeight));
layer->setTexture(fAtlas->getTexture(), bounds);
layer->setPlot(plot);
layer->setLocked(true);
this->incPlotLock(layer->plot()->id());
return true;
}
// The layer was rejected by the atlas (even though we know it is
// plausibly atlas-able). See if a plot can be purged and try again.
if (!this->purgePlot()) {
break; // We weren't able to purge any plots
}
}
}
// The texture wouldn't fit in the cache - give it it's own texture.
// This path always uses a new scratch texture and (thus) doesn't cache anything.
// This can yield a lot of re-rendering
SkAutoTUnref<GrTexture> tex(fContext->lockAndRefScratchTexture(desc,
GrContext::kApprox_ScratchTexMatch));
layer->setTexture(tex, GrIRect16::MakeWH(SkToS16(desc.fWidth), SkToS16(desc.fHeight)));
layer->setLocked(true);
return true;
}
void GrLayerCache::unlock(GrCachedLayer* layer) {
SkDEBUGCODE(GrAutoValidateLayer avl(fAtlas->getTexture(), layer);)
if (NULL == layer || !layer->locked()) {
// invalid or not locked
return;
}
if (layer->isAtlased()) {
const int plotID = layer->plot()->id();
this->decPlotLock(plotID);
// At this point we could aggressively clear out un-locked plots but
// by delaying we may be able to reuse some of the atlased layers later.
#if DISABLE_CACHING
// This testing code aggressively removes the atlased layers. This
// can be used to separate the performance contribution of less
// render target pingponging from that due to the re-use of cached layers
GrPictureInfo* pictInfo = fPictureHash.find(layer->pictureID());
SkASSERT(pictInfo);
GrAtlas::RemovePlot(&pictInfo->fPlotUsage, layer->plot());
layer->setPlot(NULL);
layer->setTexture(NULL, GrIRect16::MakeEmpty());
#endif
} else {
layer->setTexture(NULL, GrIRect16::MakeEmpty());
}
layer->setLocked(false);
}
#ifdef SK_DEBUG
void GrLayerCache::validate() const {
int plotLocks[kNumPlotsX * kNumPlotsY];
memset(plotLocks, 0, sizeof(plotLocks));
SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::ConstIter iter(&fLayerHash);
for (; !iter.done(); ++iter) {
const GrCachedLayer* layer = &(*iter);
layer->validate(fAtlas->getTexture());
const GrPictureInfo* pictInfo = fPictureHash.find(layer->pictureID());
if (pictInfo) {
// In aggressive cleanup mode a picture info should only exist if
// it has some atlased layers
#if !DISABLE_CACHING
SkASSERT(!pictInfo->fPlotUsage.isEmpty());
#endif
} else {
// If there is no picture info for this picture then all of its
// layers should be non-atlased.
SkASSERT(!layer->isAtlased());
}
if (layer->plot()) {
SkASSERT(pictInfo);
SkASSERT(pictInfo->fPictureID == layer->pictureID());
SkASSERT(pictInfo->fPlotUsage.contains(layer->plot()));
if (layer->locked()) {
plotLocks[layer->plot()->id()]++;
}
}
}
for (int i = 0; i < kNumPlotsX*kNumPlotsY; ++i) {
SkASSERT(plotLocks[i] == fPlotLocks[i]);
}
}
class GrAutoValidateCache : ::SkNoncopyable {
public:
explicit GrAutoValidateCache(GrLayerCache* cache)
: fCache(cache) {
fCache->validate();
}
~GrAutoValidateCache() {
fCache->validate();
}
private:
GrLayerCache* fCache;
};
#endif
void GrLayerCache::purge(uint32_t pictureID) {
SkDEBUGCODE(GrAutoValidateCache avc(this);)
// We need to find all the layers associated with 'picture' and remove them.
SkTDArray<GrCachedLayer*> toBeRemoved;
SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::Iter iter(&fLayerHash);
for (; !iter.done(); ++iter) {
if (pictureID == (*iter).pictureID()) {
*toBeRemoved.append() = &(*iter);
}
}
for (int i = 0; i < toBeRemoved.count(); ++i) {
SkASSERT(0 == toBeRemoved[i]->uses());
this->unlock(toBeRemoved[i]);
fLayerHash.remove(GrCachedLayer::GetKey(*toBeRemoved[i]));
SkDELETE(toBeRemoved[i]);
}
GrPictureInfo* pictInfo = fPictureHash.find(pictureID);
if (pictInfo) {
fPictureHash.remove(pictureID);
SkDELETE(pictInfo);
}
}
bool GrLayerCache::purgePlot() {
SkDEBUGCODE(GrAutoValidateCache avc(this);)
GrAtlas::PlotIter iter;
GrPlot* plot;
for (plot = fAtlas->iterInit(&iter, GrAtlas::kLRUFirst_IterOrder);
plot;
plot = iter.prev()) {
if (fPlotLocks[plot->id()] > 0) {
continue;
}
this->purgePlot(plot);
return true;
}
return false;
}
void GrLayerCache::purgePlot(GrPlot* plot) {
SkASSERT(0 == fPlotLocks[plot->id()]);
// We need to find all the layers in 'plot' and remove them.
SkTDArray<GrCachedLayer*> toBeRemoved;
SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::Iter iter(&fLayerHash);
for (; !iter.done(); ++iter) {
if (plot == (*iter).plot()) {
*toBeRemoved.append() = &(*iter);
}
}
for (int i = 0; i < toBeRemoved.count(); ++i) {
SkASSERT(0 == toBeRemoved[i]->uses());
SkASSERT(!toBeRemoved[i]->locked());
uint32_t pictureIDToRemove = toBeRemoved[i]->pictureID();
// Aggressively remove layers and, if it becomes totally uncached, delete the picture info
fLayerHash.remove(GrCachedLayer::GetKey(*toBeRemoved[i]));
SkDELETE(toBeRemoved[i]);
GrPictureInfo* pictInfo = fPictureHash.find(pictureIDToRemove);
if (pictInfo) {
GrAtlas::RemovePlot(&pictInfo->fPlotUsage, plot);
if (pictInfo->fPlotUsage.isEmpty()) {
fPictureHash.remove(pictInfo->fPictureID);
SkDELETE(pictInfo);
}
}
}
plot->resetRects();
}
void GrLayerCache::purgeAll() {
GrAtlas::PlotIter iter;
GrPlot* plot;
for (plot = fAtlas->iterInit(&iter, GrAtlas::kLRUFirst_IterOrder);
plot;
plot = iter.prev()) {
SkASSERT(0 == fPlotLocks[plot->id()]);
this->purgePlot(plot);
}
}
class GrPictureDeletionListener : public SkPicture::DeletionListener {
virtual void onDeletion(uint32_t pictureID) SK_OVERRIDE{
const GrPictureDeletedMessage message = { pictureID };
SkMessageBus<GrPictureDeletedMessage>::Post(message);
}
};
void GrLayerCache::trackPicture(const SkPicture* picture) {
if (NULL == fDeletionListener) {
fDeletionListener.reset(SkNEW(GrPictureDeletionListener));
}
picture->addDeletionListener(fDeletionListener);
}
void GrLayerCache::processDeletedPictures() {
SkTDArray<GrPictureDeletedMessage> deletedPictures;
fPictDeletionInbox.poll(&deletedPictures);
for (int i = 0; i < deletedPictures.count(); i++) {
this->purge(deletedPictures[i].pictureID);
}
}
#ifdef SK_DEVELOPER
void GrLayerCache::writeLayersToDisk(const SkString& dirName) {
GrTexture* atlasTexture = fAtlas->getTexture();
if (NULL != atlasTexture) {
SkString fileName(dirName);
fileName.append("\\atlas.png");
atlasTexture->surfacePriv().savePixels(fileName.c_str());
}
SkTDynamicHash<GrCachedLayer, GrCachedLayer::Key>::Iter iter(&fLayerHash);
for (; !iter.done(); ++iter) {
GrCachedLayer* layer = &(*iter);
if (layer->isAtlased() || !layer->texture()) {
continue;
}
SkString fileName(dirName);
fileName.append("\\");
fileName.appendU32(layer->fKey.pictureID());
fileName.append("-");
fileName.appendU32(layer->fKey.start());
fileName.append(".png");
layer->texture()->surfacePriv().savePixels(fileName.c_str());
}
}
#endif
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