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

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

gfx/skia/trunk/src/gpu/GrBufferAllocPool.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 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "GrBufferAllocPool.h"
 #include "GrDrawTargetCaps.h"
 #include "GrGpu.h"
 #include "GrIndexBuffer.h"
 #include "GrTypes.h"
 #include "GrVertexBuffer.h"
 #ifdef SK_DEBUG
     #define VALIDATE validate
 #else
     static void VALIDATE(bool = false) {}
 #endif
 // page size
 #define GrBufferAllocPool_MIN_BLOCK_SIZE ((size_t)1 << 12)
 GrBufferAllocPool::GrBufferAllocPool(GrGpu* gpu,
                                      BufferType bufferType,
                                      bool frequentResetHint,
                                      size_t blockSize,
                                      int preallocBufferCnt) :
         fBlocks(GrMax(8, 2*preallocBufferCnt)) {
     SkASSERT(NULL != gpu);
     fGpu = gpu;
     fGpu->ref();
     fGpuIsReffed = true;
     fBufferType = bufferType;
     fFrequentResetHint = frequentResetHint;
     fBufferPtr = NULL;
     fMinBlockSize = GrMax(GrBufferAllocPool_MIN_BLOCK_SIZE, blockSize);
     fBytesInUse = 0;
     fPreallocBuffersInUse = 0;
     fPreallocBufferStartIdx = 0;
     for (int i = 0; i < preallocBufferCnt; ++i) {
         GrGeometryBuffer* buffer = this->createBuffer(fMinBlockSize);
         if (NULL != buffer) {
             *fPreallocBuffers.append() = buffer;
         }
     }
 }
 GrBufferAllocPool::~GrBufferAllocPool() {
     VALIDATE();
     if (fBlocks.count()) {
         GrGeometryBuffer* buffer = fBlocks.back().fBuffer;
         if (buffer->isLocked()) {
             buffer->unlock();
         }
     }
     while (!fBlocks.empty()) {
         destroyBlock();
     }
     fPreallocBuffers.unrefAll();
     releaseGpuRef();
 }
 void GrBufferAllocPool::releaseGpuRef() {
     if (fGpuIsReffed) {
         fGpu->unref();
         fGpuIsReffed = false;
     }
 }
 void GrBufferAllocPool::reset() {
     VALIDATE();
     fBytesInUse = 0;
     if (fBlocks.count()) {
         GrGeometryBuffer* buffer = fBlocks.back().fBuffer;
         if (buffer->isLocked()) {
             buffer->unlock();
         }
     }
     // fPreallocBuffersInUse will be decremented down to zero in the while loop
     int preallocBuffersInUse = fPreallocBuffersInUse;
     while (!fBlocks.empty()) {
         this->destroyBlock();
     }
     if (fPreallocBuffers.count()) {
         // must set this after above loop.
         fPreallocBufferStartIdx = (fPreallocBufferStartIdx +
                                    preallocBuffersInUse) %
                                   fPreallocBuffers.count();
     }
     // we may have created a large cpu mirror of a large VB. Reset the size
     // to match our pre-allocated VBs.
     fCpuData.reset(fMinBlockSize);
     SkASSERT(0 == fPreallocBuffersInUse);
     VALIDATE();
 }
 void GrBufferAllocPool::unlock() {
     VALIDATE();
     if (NULL != fBufferPtr) {
         BufferBlock& block = fBlocks.back();
         if (block.fBuffer->isLocked()) {
             block.fBuffer->unlock();
         } else {
             size_t flushSize = block.fBuffer->sizeInBytes() - block.fBytesFree;
             flushCpuData(fBlocks.back().fBuffer, flushSize);
         }
         fBufferPtr = NULL;
     }
     VALIDATE();
 }
 #ifdef SK_DEBUG
 void GrBufferAllocPool::validate(bool unusedBlockAllowed) const {
     if (NULL != fBufferPtr) {
         SkASSERT(!fBlocks.empty());
         if (fBlocks.back().fBuffer->isLocked()) {
             GrGeometryBuffer* buf = fBlocks.back().fBuffer;
             SkASSERT(buf->lockPtr() == fBufferPtr);
         } else {
             SkASSERT(fCpuData.get() == fBufferPtr);
         }
     } else {
         SkASSERT(fBlocks.empty() || !fBlocks.back().fBuffer->isLocked());
     }
     size_t bytesInUse = 0;
     for (int i = 0; i < fBlocks.count() - 1; ++i) {
         SkASSERT(!fBlocks[i].fBuffer->isLocked());
     }
     for (int i = 0; i < fBlocks.count(); ++i) {
         size_t bytes = fBlocks[i].fBuffer->sizeInBytes() - fBlocks[i].fBytesFree;
         bytesInUse += bytes;
         SkASSERT(bytes || unusedBlockAllowed);
     }
     SkASSERT(bytesInUse == fBytesInUse);
     if (unusedBlockAllowed) {
         SkASSERT((fBytesInUse && !fBlocks.empty()) ||
                  (!fBytesInUse && (fBlocks.count() < 2)));
     } else {
         SkASSERT((0 == fBytesInUse) == fBlocks.empty());
     }
 }
 #endif
 void* GrBufferAllocPool::makeSpace(size_t size,
                                    size_t alignment,
                                    const GrGeometryBuffer** buffer,
                                    size_t* offset) {
     VALIDATE();
     SkASSERT(NULL != buffer);
     SkASSERT(NULL != offset);
     if (NULL != fBufferPtr) {
         BufferBlock& back = fBlocks.back();
         size_t usedBytes = back.fBuffer->sizeInBytes() - back.fBytesFree;
         size_t pad = GrSizeAlignUpPad(usedBytes,
                                       alignment);
         if ((size + pad) <= back.fBytesFree) {
             usedBytes += pad;
             *offset = usedBytes;
             *buffer = back.fBuffer;
             back.fBytesFree -= size + pad;
             fBytesInUse += size + pad;
             VALIDATE();
             return (void*)(reinterpret_cast<intptr_t>(fBufferPtr) + usedBytes);
         }
     }
     // We could honor the space request using by a partial update of the current
     // VB (if there is room). But we don't currently use draw calls to GL that
     // allow the driver to know that previously issued draws won't read from
     // the part of the buffer we update. Also, the GL buffer implementation
     // may be cheating on the actual buffer size by shrinking the buffer on
     // updateData() if the amount of data passed is less than the full buffer
     // size.
     if (!createBlock(size)) {
         return NULL;
     }
     SkASSERT(NULL != fBufferPtr);
     *offset = 0;
     BufferBlock& back = fBlocks.back();
     *buffer = back.fBuffer;
     back.fBytesFree -= size;
     fBytesInUse += size;
     VALIDATE();
     return fBufferPtr;
 }
 int GrBufferAllocPool::currentBufferItems(size_t itemSize) const {
     VALIDATE();
     if (NULL != fBufferPtr) {
         const BufferBlock& back = fBlocks.back();
         size_t usedBytes = back.fBuffer->sizeInBytes() - back.fBytesFree;
         size_t pad = GrSizeAlignUpPad(usedBytes, itemSize);
         return static_cast<int>((back.fBytesFree - pad) / itemSize);
     } else if (fPreallocBuffersInUse < fPreallocBuffers.count()) {
         return static_cast<int>(fMinBlockSize / itemSize);
     }
     return 0;
 }
 int GrBufferAllocPool::preallocatedBuffersRemaining() const {
     return fPreallocBuffers.count() - fPreallocBuffersInUse;
 }
 int GrBufferAllocPool::preallocatedBufferCount() const {
     return fPreallocBuffers.count();
 }
 void GrBufferAllocPool::putBack(size_t bytes) {
     VALIDATE();
     // if the putBack unwinds all the preallocated buffers then we will
     // advance the starting index. As blocks are destroyed fPreallocBuffersInUse
     // will be decremented. I will reach zero if all blocks using preallocated
     // buffers are released.
     int preallocBuffersInUse = fPreallocBuffersInUse;
     while (bytes) {
         // caller shouldnt try to put back more than they've taken
         SkASSERT(!fBlocks.empty());
         BufferBlock& block = fBlocks.back();
         size_t bytesUsed = block.fBuffer->sizeInBytes() - block.fBytesFree;
         if (bytes >= bytesUsed) {
             bytes -= bytesUsed;
             fBytesInUse -= bytesUsed;
             // if we locked a vb to satisfy the make space and we're releasing
             // beyond it, then unlock it.
             if (block.fBuffer->isLocked()) {
                 block.fBuffer->unlock();
             }
             this->destroyBlock();
         } else {
             block.fBytesFree += bytes;
             fBytesInUse -= bytes;
             bytes = 0;
             break;
         }
     }
     if (!fPreallocBuffersInUse && fPreallocBuffers.count()) {
             fPreallocBufferStartIdx = (fPreallocBufferStartIdx +
                                        preallocBuffersInUse) %
                                       fPreallocBuffers.count();
     }
     VALIDATE();
 }
 bool GrBufferAllocPool::createBlock(size_t requestSize) {
     size_t size = GrMax(requestSize, fMinBlockSize);
     SkASSERT(size >= GrBufferAllocPool_MIN_BLOCK_SIZE);
     VALIDATE();
     BufferBlock& block = fBlocks.push_back();
     if (size == fMinBlockSize &&
         fPreallocBuffersInUse < fPreallocBuffers.count()) {
         uint32_t nextBuffer = (fPreallocBuffersInUse +
                                fPreallocBufferStartIdx) %
                               fPreallocBuffers.count();
         block.fBuffer = fPreallocBuffers[nextBuffer];
         block.fBuffer->ref();
         ++fPreallocBuffersInUse;
     } else {
         block.fBuffer = this->createBuffer(size);
         if (NULL == block.fBuffer) {
             fBlocks.pop_back();
             return false;
         }
     }
     block.fBytesFree = size;
     if (NULL != fBufferPtr) {
         SkASSERT(fBlocks.count() > 1);
         BufferBlock& prev = fBlocks.fromBack(1);
         if (prev.fBuffer->isLocked()) {
             prev.fBuffer->unlock();
         } else {
             flushCpuData(prev.fBuffer,
                          prev.fBuffer->sizeInBytes() - prev.fBytesFree);
         }
         fBufferPtr = NULL;
     }
     SkASSERT(NULL == fBufferPtr);
     // If the buffer is CPU-backed we lock it because it is free to do so and saves a copy.
     // Otherwise when buffer locking is supported:
     //      a) If the frequently reset hint is set we only lock when the requested size meets a
     //      threshold (since we don't expect it is likely that we will see more vertex data)
     //      b) If the hint is not set we lock if the buffer size is greater than the threshold.
     bool attemptLock = block.fBuffer->isCPUBacked();
     if (!attemptLock && fGpu->caps()->bufferLockSupport()) {
         if (fFrequentResetHint) {
             attemptLock = requestSize > GR_GEOM_BUFFER_LOCK_THRESHOLD;
         } else {
             attemptLock = size > GR_GEOM_BUFFER_LOCK_THRESHOLD;
         }
     }
     if (attemptLock) {
         fBufferPtr = block.fBuffer->lock();
     }
     if (NULL == fBufferPtr) {
         fBufferPtr = fCpuData.reset(size);
     }
     VALIDATE(true);
     return true;
 }
 void GrBufferAllocPool::destroyBlock() {
     SkASSERT(!fBlocks.empty());
     BufferBlock& block = fBlocks.back();
     if (fPreallocBuffersInUse > 0) {
         uint32_t prevPreallocBuffer = (fPreallocBuffersInUse +
                                        fPreallocBufferStartIdx +
                                        (fPreallocBuffers.count() - 1)) %
                                       fPreallocBuffers.count();
         if (block.fBuffer == fPreallocBuffers[prevPreallocBuffer]) {
             --fPreallocBuffersInUse;
         }
     }
     SkASSERT(!block.fBuffer->isLocked());
     block.fBuffer->unref();
     fBlocks.pop_back();
     fBufferPtr = NULL;
 }
 void GrBufferAllocPool::flushCpuData(GrGeometryBuffer* buffer,
                                      size_t flushSize) {
     SkASSERT(NULL != buffer);
     SkASSERT(!buffer->isLocked());
     SkASSERT(fCpuData.get() == fBufferPtr);
     SkASSERT(flushSize <= buffer->sizeInBytes());
     VALIDATE(true);
     if (fGpu->caps()->bufferLockSupport() &&
         flushSize > GR_GEOM_BUFFER_LOCK_THRESHOLD) {
         void* data = buffer->lock();
         if (NULL != data) {
             memcpy(data, fBufferPtr, flushSize);
             buffer->unlock();
             return;
         }
     }
     buffer->updateData(fBufferPtr, flushSize);
     VALIDATE(true);
 }
 GrGeometryBuffer* GrBufferAllocPool::createBuffer(size_t size) {
     if (kIndex_BufferType == fBufferType) {
         return fGpu->createIndexBuffer(size, true);
     } else {
         SkASSERT(kVertex_BufferType == fBufferType);
         return fGpu->createVertexBuffer(size, true);
     }
 }
 ////////////////////////////////////////////////////////////////////////////////
 GrVertexBufferAllocPool::GrVertexBufferAllocPool(GrGpu* gpu,
                                                  bool frequentResetHint,
                                                  size_t bufferSize,
                                                  int preallocBufferCnt)
 : GrBufferAllocPool(gpu,
                     kVertex_BufferType,
                     frequentResetHint,
                     bufferSize,
                     preallocBufferCnt) {
 }
 void* GrVertexBufferAllocPool::makeSpace(size_t vertexSize,
                                          int vertexCount,
                                          const GrVertexBuffer** buffer,
                                          int* startVertex) {
     SkASSERT(vertexCount >= 0);
     SkASSERT(NULL != buffer);
     SkASSERT(NULL != startVertex);
     size_t offset = 0; // assign to suppress warning
     const GrGeometryBuffer* geomBuffer = NULL; // assign to suppress warning
     void* ptr = INHERITED::makeSpace(vertexSize * vertexCount,
                                      vertexSize,
                                      &geomBuffer,
                                      &offset);
     *buffer = (const GrVertexBuffer*) geomBuffer;
     SkASSERT(0 == offset % vertexSize);
     *startVertex = static_cast<int>(offset / vertexSize);
     return ptr;
 }
 bool GrVertexBufferAllocPool::appendVertices(size_t vertexSize,
                                              int vertexCount,
                                              const void* vertices,
                                              const GrVertexBuffer** buffer,
                                              int* startVertex) {
     void* space = makeSpace(vertexSize, vertexCount, buffer, startVertex);
     if (NULL != space) {
         memcpy(space,
                vertices,
                vertexSize * vertexCount);
         return true;
     } else {
         return false;
     }
 }
 int GrVertexBufferAllocPool::preallocatedBufferVertices(size_t vertexSize) const {
     return static_cast<int>(INHERITED::preallocatedBufferSize() / vertexSize);
 }
 int GrVertexBufferAllocPool::currentBufferVertices(size_t vertexSize) const {
     return currentBufferItems(vertexSize);
 }
 ////////////////////////////////////////////////////////////////////////////////
 GrIndexBufferAllocPool::GrIndexBufferAllocPool(GrGpu* gpu,
                                                bool frequentResetHint,
                                                size_t bufferSize,
                                                int preallocBufferCnt)
 : GrBufferAllocPool(gpu,
                     kIndex_BufferType,
                     frequentResetHint,
                     bufferSize,
                     preallocBufferCnt) {
 }
 void* GrIndexBufferAllocPool::makeSpace(int indexCount,
                                         const GrIndexBuffer** buffer,
                                         int* startIndex) {
     SkASSERT(indexCount >= 0);
     SkASSERT(NULL != buffer);
     SkASSERT(NULL != startIndex);
     size_t offset = 0; // assign to suppress warning
     const GrGeometryBuffer* geomBuffer = NULL; // assign to suppress warning
     void* ptr = INHERITED::makeSpace(indexCount * sizeof(uint16_t),
                                      sizeof(uint16_t),
                                      &geomBuffer,
                                      &offset);
     *buffer = (const GrIndexBuffer*) geomBuffer;
     SkASSERT(0 == offset % sizeof(uint16_t));
     *startIndex = static_cast<int>(offset / sizeof(uint16_t));
     return ptr;
 }
 bool GrIndexBufferAllocPool::appendIndices(int indexCount,
                                            const void* indices,
                                            const GrIndexBuffer** buffer,
                                            int* startIndex) {
     void* space = makeSpace(indexCount, buffer, startIndex);
     if (NULL != space) {
         memcpy(space, indices, sizeof(uint16_t) * indexCount);
         return true;
     } else {
         return false;
     }
 }
 int GrIndexBufferAllocPool::preallocatedBufferIndices() const {
     return static_cast<int>(INHERITED::preallocatedBufferSize() / sizeof(uint16_t));
 }
 int GrIndexBufferAllocPool::currentBufferIndices() const {
     return currentBufferItems(sizeof(uint16_t));
 }

The Tor Browser / annotate

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

gfx/skia/trunk/src/gpu/GrBufferAllocPool.cpp