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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 <algorithm>
#include <vector>
#include "core/fpdfapi/page/cpdf_image.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 {
CacheInfo(uint32_t t, CPDF_Stream* stream) : time(t), pStream(stream) {}
uint32_t time;
CPDF_Stream* pStream;
bool operator<(const CacheInfo& other) const { return time < other.time; }
};
} // 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();
std::vector<CacheInfo> cache_info;
cache_info.reserve(nCount);
for (const auto& it : m_ImageCache) {
cache_info.emplace_back(it.second->GetTimeCount(),
it.second->GetImage()->GetStream());
}
std::sort(cache_info.begin(), cache_info.end());
// Check if time value is about to roll over and reset all entries.
// The comparision is legal because uint32_t is an unsigned type.
uint32_t nTimeCount = m_nTimeCount;
if (nTimeCount + 1 < nTimeCount) {
for (size_t i = 0; i < nCount; i++)
m_ImageCache[cache_info[i].pStream]->m_dwTimeCount = i;
m_nTimeCount = nCount;
}
size_t i = 0;
while (i + 15 < nCount)
ClearImageCacheEntry(cache_info[i++].pStream);
while (i < nCount && m_nCacheSize > (uint32_t)dwLimitCacheSize)
ClearImageCacheEntry(cache_info[i++].pStream);
}
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(
const RetainPtr<CPDF_Image>& pImage,
bool bStdCS,
uint32_t GroupFamily,
bool bLoadMask,
CPDF_RenderStatus* pRenderStatus) {
CPDF_Stream* pStream = pImage->GetStream();
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->GetDocument(), pImage);
}
CPDF_DIBSource::LoadState ret = m_pCurImageCacheEntry->StartGetCachedBitmap(
pRenderStatus->GetFormResource(), m_pPage->m_pPageResources.Get(), bStdCS,
GroupFamily, bLoadMask, pRenderStatus);
if (ret == CPDF_DIBSource::LoadState::kContinue)
return true;
m_nTimeCount++;
if (!m_bCurFindCache)
m_ImageCache[pStream] = m_pCurImageCacheEntry;
if (ret == CPDF_DIBSource::LoadState::kFail)
m_nCacheSize += m_pCurImageCacheEntry->EstimateSize();
return false;
}
bool CPDF_PageRenderCache::Continue(PauseIndicatorIface* pPause,
CPDF_RenderStatus* pRenderStatus) {
bool ret = m_pCurImageCacheEntry->Continue(pPause, pRenderStatus);
if (ret)
return true;
m_nTimeCount++;
if (!m_bCurFindCache) {
m_ImageCache[m_pCurImageCacheEntry->GetImage()->GetStream()] =
m_pCurImageCacheEntry;
}
m_nCacheSize += m_pCurImageCacheEntry->EstimateSize();
return false;
}
void CPDF_PageRenderCache::ResetBitmap(const RetainPtr<CPDF_Image>& pImage,
const RetainPtr<CFX_DIBitmap>& pBitmap) {
CPDF_ImageCacheEntry* pEntry;
CPDF_Stream* pStream = pImage->GetStream();
const auto it = m_ImageCache.find(pStream);
if (it == m_ImageCache.end()) {
if (!pBitmap)
return;
pEntry = new CPDF_ImageCacheEntry(m_pPage->GetDocument(), pImage);
m_ImageCache[pStream] = pEntry;
} else {
pEntry = it->second;
}
m_nCacheSize -= pEntry->EstimateSize();
pEntry->Reset(pBitmap);
m_nCacheSize += pEntry->EstimateSize();
}
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