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// Copyright 2016 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fpdfapi/render/cpdf_pagerendercache.h"
#include "core/fpdfapi/page/cpdf_page.h"
#include "core/fpdfapi/render/cpdf_imagecacheentry.h"
#include "core/fpdfapi/render/cpdf_renderstatus.h"
namespace {
struct CACHEINFO {
uint32_t time;
CPDF_Stream* pStream;
};
extern "C" {
static int compare(const void* data1, const void* data2) {
return ((CACHEINFO*)data1)->time - ((CACHEINFO*)data2)->time;
}
} // extern "C"
} // namespace
CPDF_PageRenderCache::CPDF_PageRenderCache(CPDF_Page* pPage)
: m_pPage(pPage),
m_pCurImageCacheEntry(nullptr),
m_nTimeCount(0),
m_nCacheSize(0),
m_bCurFindCache(false) {}
CPDF_PageRenderCache::~CPDF_PageRenderCache() {
for (const auto& it : m_ImageCache)
delete it.second;
}
void CPDF_PageRenderCache::CacheOptimization(int32_t dwLimitCacheSize) {
if (m_nCacheSize <= (uint32_t)dwLimitCacheSize)
return;
size_t nCount = m_ImageCache.size();
CACHEINFO* pCACHEINFO = FX_Alloc(CACHEINFO, nCount);
size_t i = 0;
for (const auto& it : m_ImageCache) {
pCACHEINFO[i].time = it.second->GetTimeCount();
pCACHEINFO[i++].pStream = it.second->GetStream();
}
FXSYS_qsort(pCACHEINFO, nCount, sizeof(CACHEINFO), compare);
uint32_t nTimeCount = m_nTimeCount;
// Check if time value is about to roll over and reset all entries.
// The comparision is legal because uint32_t is an unsigned type.
if (nTimeCount + 1 < nTimeCount) {
for (i = 0; i < nCount; i++)
m_ImageCache[pCACHEINFO[i].pStream]->m_dwTimeCount = i;
m_nTimeCount = nCount;
}
i = 0;
while (i + 15 < nCount)
ClearImageCacheEntry(pCACHEINFO[i++].pStream);
while (i < nCount && m_nCacheSize > (uint32_t)dwLimitCacheSize)
ClearImageCacheEntry(pCACHEINFO[i++].pStream);
FX_Free(pCACHEINFO);
}
void CPDF_PageRenderCache::ClearImageCacheEntry(CPDF_Stream* pStream) {
auto it = m_ImageCache.find(pStream);
if (it == m_ImageCache.end())
return;
m_nCacheSize -= it->second->EstimateSize();
delete it->second;
m_ImageCache.erase(it);
}
bool CPDF_PageRenderCache::StartGetCachedBitmap(
CPDF_Stream* pStream,
bool bStdCS,
uint32_t GroupFamily,
bool bLoadMask,
CPDF_RenderStatus* pRenderStatus,
int32_t downsampleWidth,
int32_t downsampleHeight) {
const auto it = m_ImageCache.find(pStream);
m_bCurFindCache = it != m_ImageCache.end();
if (m_bCurFindCache) {
m_pCurImageCacheEntry = it->second;
} else {
m_pCurImageCacheEntry =
new CPDF_ImageCacheEntry(m_pPage->m_pDocument, pStream);
}
int ret = m_pCurImageCacheEntry->StartGetCachedBitmap(
pRenderStatus->m_pFormResource, m_pPage->m_pPageResources, bStdCS,
GroupFamily, bLoadMask, pRenderStatus, downsampleWidth, downsampleHeight);
if (ret == 2)
return true;
m_nTimeCount++;
if (!m_bCurFindCache)
m_ImageCache[pStream] = m_pCurImageCacheEntry;
if (!ret)
m_nCacheSize += m_pCurImageCacheEntry->EstimateSize();
return false;
}
bool CPDF_PageRenderCache::Continue(IFX_Pause* pPause) {
int ret = m_pCurImageCacheEntry->Continue(pPause);
if (ret == 2)
return true;
m_nTimeCount++;
if (!m_bCurFindCache)
m_ImageCache[m_pCurImageCacheEntry->GetStream()] = m_pCurImageCacheEntry;
if (!ret)
m_nCacheSize += m_pCurImageCacheEntry->EstimateSize();
return false;
}
void CPDF_PageRenderCache::ResetBitmap(CPDF_Stream* pStream,
const CFX_DIBitmap* pBitmap) {
CPDF_ImageCacheEntry* pEntry;
const auto it = m_ImageCache.find(pStream);
if (it == m_ImageCache.end()) {
if (!pBitmap)
return;
pEntry = new CPDF_ImageCacheEntry(m_pPage->m_pDocument, pStream);
m_ImageCache[pStream] = pEntry;
} else {
pEntry = it->second;
}
m_nCacheSize -= pEntry->EstimateSize();
pEntry->Reset(pBitmap);
m_nCacheSize += pEntry->EstimateSize();
}
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