The Tor Browser: gfx/skia/trunk/src/gpu/effects/GrTextureStripAtlas.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/effects/GrTextureStripAtlas.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/effects/GrTextureStripAtlas.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "GrTextureStripAtlas.h"
 #include "SkPixelRef.h"
 #include "SkTSearch.h"
 #include "GrTexture.h"
 #ifdef SK_DEBUG
     #define VALIDATE this->validate()
 #else
     #define VALIDATE
 #endif
 int32_t GrTextureStripAtlas::gCacheCount = 0;
 GrTHashTable<GrTextureStripAtlas::AtlasEntry,
                 GrTextureStripAtlas::AtlasHashKey, 8>*
                             GrTextureStripAtlas::gAtlasCache = NULL;
 GrTHashTable<GrTextureStripAtlas::AtlasEntry, GrTextureStripAtlas::AtlasHashKey, 8>*
 GrTextureStripAtlas::GetCache() {
     if (NULL == gAtlasCache) {
         gAtlasCache = SkNEW((GrTHashTable<AtlasEntry, AtlasHashKey, 8>));
     }
     return gAtlasCache;
 }
 // Remove the specified atlas from the cache
 void GrTextureStripAtlas::CleanUp(const GrContext*, void* info) {
     SkASSERT(NULL != info);
     AtlasEntry* entry = static_cast<AtlasEntry*>(info);
     // remove the cache entry
     GetCache()->remove(entry->fKey, entry);
     // remove the actual entry
     SkDELETE(entry);
     if (0 == GetCache()->count()) {
         SkDELETE(gAtlasCache);
         gAtlasCache = NULL;
     }
 }
 GrTextureStripAtlas* GrTextureStripAtlas::GetAtlas(const GrTextureStripAtlas::Desc& desc) {
     AtlasHashKey key;
     key.setKeyData(desc.asKey());
     AtlasEntry* entry = GetCache()->find(key);
     if (NULL == entry) {
         entry = SkNEW(AtlasEntry);
         entry->fAtlas = SkNEW_ARGS(GrTextureStripAtlas, (desc));
         entry->fKey = key;
         desc.fContext->addCleanUp(CleanUp, entry);
         GetCache()->insert(key, entry);
     }
     return entry->fAtlas;
 }
 GrTextureStripAtlas::GrTextureStripAtlas(GrTextureStripAtlas::Desc desc)
     : fCacheKey(sk_atomic_inc(&gCacheCount))
     , fLockedRows(0)
     , fDesc(desc)
     , fNumRows(desc.fHeight / desc.fRowHeight)
     , fTexture(NULL)
     , fRows(SkNEW_ARRAY(AtlasRow, fNumRows))
     , fLRUFront(NULL)
     , fLRUBack(NULL) {
     SkASSERT(fNumRows * fDesc.fRowHeight == fDesc.fHeight);
     this->initLRU();
     VALIDATE;
 }
 GrTextureStripAtlas::~GrTextureStripAtlas() {
     SkDELETE_ARRAY(fRows);
 }
 int GrTextureStripAtlas::lockRow(const SkBitmap& data) {
     VALIDATE;
     if (0 == fLockedRows) {
         this->lockTexture();
     }
     int key = data.getGenerationID();
     int rowNumber = -1;
     int index = this->searchByKey(key);
     if (index >= 0) {
         // We already have the data in a row, so we can just return that row
         AtlasRow* row = fKeyTable[index];
         if (0 == row->fLocks) {
             this->removeFromLRU(row);
         }
         ++row->fLocks;
         ++fLockedRows;
         // Since all the rows are always stored in a contiguous array, we can save the memory
         // required for storing row numbers and just compute it with some pointer arithmetic
         rowNumber = static_cast<int>(row - fRows);
     } else {
         // ~index is the index where we will insert the new key to keep things sorted
         index = ~index;
         // We don't have this data cached, so pick the least recently used row to copy into
         AtlasRow* row = this->getLRU();
         ++fLockedRows;
         if (NULL == row) {
             // force a flush, which should unlock all the rows; then try again
             fDesc.fContext->flush();
             row = this->getLRU();
             if (NULL == row) {
                 --fLockedRows;
                 return -1;
             }
         }
         this->removeFromLRU(row);
         uint32_t oldKey = row->fKey;
         // If we are writing into a row that already held bitmap data, we need to remove the
         // reference to that genID which is stored in our sorted table of key values.
         if (oldKey != kEmptyAtlasRowKey) {
             // Find the entry in the list; if it's before the index where we plan on adding the new
             // entry, we decrement since it will shift elements ahead of it back by one.
             int oldIndex = this->searchByKey(oldKey);
             if (oldIndex < index) {
                 --index;
             }
             fKeyTable.remove(oldIndex);
         }
         row->fKey = key;
         row->fLocks = 1;
         fKeyTable.insert(index, 1, &row);
         rowNumber = static_cast<int>(row - fRows);
         SkAutoLockPixels lock(data);
         // Pass in the kDontFlush flag, since we know we're writing to a part of this texture
         // that is not currently in use
         fDesc.fContext->writeTexturePixels(fTexture,
 ,  rowNumber * fDesc.fRowHeight,
                                            fDesc.fWidth, fDesc.fRowHeight,
                                            SkBitmapConfig2GrPixelConfig(data.config()),
                                            data.getPixels(),
                                            data.rowBytes(),
                                            GrContext::kDontFlush_PixelOpsFlag);
     }
     SkASSERT(rowNumber >= 0);
     VALIDATE;
     return rowNumber;
 }
 void GrTextureStripAtlas::unlockRow(int row) {
     VALIDATE;
     --fRows[row].fLocks;
     --fLockedRows;
     SkASSERT(fRows[row].fLocks >= 0 && fLockedRows >= 0);
     if (0 == fRows[row].fLocks) {
         this->appendLRU(fRows + row);
     }
     if (0 == fLockedRows) {
         this->unlockTexture();
     }
     VALIDATE;
 }
 GrTextureStripAtlas::AtlasRow* GrTextureStripAtlas::getLRU() {
     // Front is least-recently-used
     AtlasRow* row = fLRUFront;
     return row;
 }
 void GrTextureStripAtlas::lockTexture() {
     GrTextureParams params;
     GrTextureDesc texDesc;
     texDesc.fWidth = fDesc.fWidth;
     texDesc.fHeight = fDesc.fHeight;
     texDesc.fConfig = fDesc.fConfig;
     static const GrCacheID::Domain gTextureStripAtlasDomain = GrCacheID::GenerateDomain();
     GrCacheID::Key key;
     *key.fData32 = fCacheKey;
     memset(key.fData32 + 1, 0, sizeof(key) - sizeof(uint32_t));
     GrCacheID cacheID(gTextureStripAtlasDomain, key);
     fTexture = fDesc.fContext->findAndRefTexture(texDesc, cacheID, &params);
     if (NULL == fTexture) {
         fTexture = fDesc.fContext->createTexture(&params, texDesc, cacheID, NULL, 0);
         // This is a new texture, so all of our cache info is now invalid
         this->initLRU();
         fKeyTable.rewind();
     }
     SkASSERT(NULL != fTexture);
 }
 void GrTextureStripAtlas::unlockTexture() {
     SkASSERT(NULL != fTexture && 0 == fLockedRows);
     fTexture->unref();
     fTexture = NULL;
     fDesc.fContext->purgeCache();
 }
 void GrTextureStripAtlas::initLRU() {
     fLRUFront = NULL;
     fLRUBack = NULL;
     // Initially all the rows are in the LRU list
     for (int i = 0; i < fNumRows; ++i) {
         fRows[i].fKey = kEmptyAtlasRowKey;
         fRows[i].fNext = NULL;
         fRows[i].fPrev = NULL;
         this->appendLRU(fRows + i);
     }
     SkASSERT(NULL == fLRUFront || NULL == fLRUFront->fPrev);
     SkASSERT(NULL == fLRUBack || NULL == fLRUBack->fNext);
 }
 void GrTextureStripAtlas::appendLRU(AtlasRow* row) {
     SkASSERT(NULL == row->fPrev && NULL == row->fNext);
     if (NULL == fLRUFront && NULL == fLRUBack) {
         fLRUFront = row;
         fLRUBack = row;
     } else {
         row->fPrev = fLRUBack;
         fLRUBack->fNext = row;
         fLRUBack = row;
     }
 }
 void GrTextureStripAtlas::removeFromLRU(AtlasRow* row) {
     SkASSERT(NULL != row);
     if (NULL != row->fNext && NULL != row->fPrev) {
         row->fPrev->fNext = row->fNext;
         row->fNext->fPrev = row->fPrev;
     } else {
         if (NULL == row->fNext) {
             SkASSERT(row == fLRUBack);
             fLRUBack = row->fPrev;
             if (fLRUBack) {
                 fLRUBack->fNext = NULL;
             }
         }
         if (NULL == row->fPrev) {
             SkASSERT(row == fLRUFront);
             fLRUFront = row->fNext;
             if (fLRUFront) {
                 fLRUFront->fPrev = NULL;
             }
         }
     }
     row->fNext = NULL;
     row->fPrev = NULL;
 }
 int GrTextureStripAtlas::searchByKey(uint32_t key) {
     AtlasRow target;
     target.fKey = key;
     return SkTSearch<const AtlasRow,
                      GrTextureStripAtlas::KeyLess>((const AtlasRow**)fKeyTable.begin(),
                                                    fKeyTable.count(),
                                                    &target,
                                                    sizeof(AtlasRow*));
 }
 #ifdef SK_DEBUG
 void GrTextureStripAtlas::validate() {
     // Our key table should be sorted
     uint32_t prev = 1 > fKeyTable.count() ? 0 : fKeyTable[0]->fKey;
     for (int i = 1; i < fKeyTable.count(); ++i) {
         SkASSERT(prev < fKeyTable[i]->fKey);
         SkASSERT(fKeyTable[i]->fKey != kEmptyAtlasRowKey);
         prev = fKeyTable[i]->fKey;
     }
     int lruCount = 0;
     // Validate LRU pointers, and count LRU entries
     SkASSERT(NULL == fLRUFront || NULL == fLRUFront->fPrev);
     SkASSERT(NULL == fLRUBack  || NULL == fLRUBack->fNext);
     for (AtlasRow* r = fLRUFront; r != NULL; r = r->fNext) {
         if (NULL == r->fNext) {
             SkASSERT(r == fLRUBack);
         } else {
             SkASSERT(r->fNext->fPrev == r);
         }
         ++lruCount;
     }
     int rowLocks = 0;
     int freeRows = 0;
     for (int i = 0; i < fNumRows; ++i) {
         rowLocks += fRows[i].fLocks;
         if (0 == fRows[i].fLocks) {
             ++freeRows;
             bool inLRU = false;
             // Step through the LRU and make sure it's present
             for (AtlasRow* r = fLRUFront; r != NULL; r = r->fNext) {
                 if (r == &fRows[i]) {
                     inLRU = true;
                     break;
                 }
             }
             SkASSERT(inLRU);
         } else {
             // If we are locked, we should have a key
             SkASSERT(kEmptyAtlasRowKey != fRows[i].fKey);
         }
         // If we have a key != kEmptyAtlasRowKey, it should be in the key table
         SkASSERT(fRows[i].fKey == kEmptyAtlasRowKey || this->searchByKey(fRows[i].fKey) >= 0);
     }
     // Our count of locks should equal the sum of row locks, unless we ran out of rows and flushed,
     // in which case we'll have one more lock than recorded in the rows (to represent the pending
     // lock of a row; which ensures we don't unlock the texture prematurely).
     SkASSERT(rowLocks == fLockedRows || rowLocks + 1 == fLockedRows);
     // We should have one lru entry for each free row
     SkASSERT(freeRows == lruCount);
     // If we have locked rows, we should have a locked texture, otherwise
     // it should be unlocked
     if (fLockedRows == 0) {
         SkASSERT(NULL == fTexture);
     } else {
         SkASSERT(NULL != fTexture);
     }
 }
 #endif

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gfx/skia/trunk/src/gpu/effects/GrTextureStripAtlas.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/gpu/effects/GrTextureStripAtlas.cpp