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      1 // Copyright 2016 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #include "core/fpdfapi/render/cpdf_imagecacheentry.h"
      8 
      9 #include <memory>
     10 #include <utility>
     11 
     12 #include "core/fpdfapi/page/cpdf_page.h"
     13 #include "core/fpdfapi/parser/cpdf_dictionary.h"
     14 #include "core/fpdfapi/parser/cpdf_document.h"
     15 #include "core/fpdfapi/parser/cpdf_stream.h"
     16 #include "core/fpdfapi/render/cpdf_dibsource.h"
     17 #include "core/fpdfapi/render/cpdf_pagerendercache.h"
     18 #include "core/fpdfapi/render/cpdf_rendercontext.h"
     19 #include "core/fpdfapi/render/cpdf_renderstatus.h"
     20 #include "core/fxge/dib/cfx_dibitmap.h"
     21 
     22 CPDF_ImageCacheEntry::CPDF_ImageCacheEntry(CPDF_Document* pDoc,
     23                                            const RetainPtr<CPDF_Image>& pImage)
     24     : m_dwTimeCount(0),
     25       m_MatteColor(0),
     26       m_pDocument(pDoc),
     27       m_pImage(pImage),
     28       m_dwCacheSize(0) {}
     29 
     30 CPDF_ImageCacheEntry::~CPDF_ImageCacheEntry() {}
     31 
     32 void CPDF_ImageCacheEntry::Reset(const RetainPtr<CFX_DIBitmap>& pBitmap) {
     33   m_pCachedBitmap.Reset();
     34   if (pBitmap)
     35     m_pCachedBitmap = pBitmap->Clone(nullptr);
     36   CalcSize();
     37 }
     38 
     39 static uint32_t FPDF_ImageCache_EstimateImageSize(
     40     const RetainPtr<CFX_DIBSource>& pDIB) {
     41   return pDIB && pDIB->GetBuffer()
     42              ? (uint32_t)pDIB->GetHeight() * pDIB->GetPitch() +
     43                    (uint32_t)pDIB->GetPaletteSize() * 4
     44              : 0;
     45 }
     46 
     47 RetainPtr<CFX_DIBSource> CPDF_ImageCacheEntry::DetachBitmap() {
     48   return std::move(m_pCurBitmap);
     49 }
     50 
     51 RetainPtr<CFX_DIBSource> CPDF_ImageCacheEntry::DetachMask() {
     52   return std::move(m_pCurMask);
     53 }
     54 
     55 int CPDF_ImageCacheEntry::StartGetCachedBitmap(
     56     CPDF_Dictionary* pFormResources,
     57     CPDF_Dictionary* pPageResources,
     58     bool bStdCS,
     59     uint32_t GroupFamily,
     60     bool bLoadMask,
     61     CPDF_RenderStatus* pRenderStatus) {
     62   ASSERT(pRenderStatus);
     63 
     64   if (m_pCachedBitmap) {
     65     m_pCurBitmap = m_pCachedBitmap;
     66     m_pCurMask = m_pCachedMask;
     67     return 1;
     68   }
     69 
     70   m_pCurBitmap = pdfium::MakeRetain<CPDF_DIBSource>();
     71   int ret = m_pCurBitmap.As<CPDF_DIBSource>()->StartLoadDIBSource(
     72       m_pDocument.Get(), m_pImage->GetStream(), true, pFormResources,
     73       pPageResources, bStdCS, GroupFamily, bLoadMask);
     74   if (ret == 2)
     75     return ret;
     76 
     77   if (!ret) {
     78     m_pCurBitmap.Reset();
     79     return 0;
     80   }
     81   ContinueGetCachedBitmap(pRenderStatus);
     82   return 0;
     83 }
     84 
     85 void CPDF_ImageCacheEntry::ContinueGetCachedBitmap(
     86     CPDF_RenderStatus* pRenderStatus) {
     87   m_MatteColor = m_pCurBitmap.As<CPDF_DIBSource>()->GetMatteColor();
     88   m_pCurMask = m_pCurBitmap.As<CPDF_DIBSource>()->DetachMask();
     89   CPDF_RenderContext* pContext = pRenderStatus->GetContext();
     90   CPDF_PageRenderCache* pPageRenderCache = pContext->GetPageCache();
     91   m_dwTimeCount = pPageRenderCache->GetTimeCount();
     92   if (m_pCurBitmap->GetPitch() * m_pCurBitmap->GetHeight() <
     93       FPDF_HUGE_IMAGE_SIZE) {
     94     m_pCachedBitmap = m_pCurBitmap->Clone(nullptr);
     95     m_pCurBitmap.Reset();
     96   } else {
     97     m_pCachedBitmap = m_pCurBitmap;
     98   }
     99   if (m_pCurMask) {
    100     m_pCachedMask = m_pCurMask->Clone(nullptr);
    101     m_pCurMask.Reset();
    102   }
    103   m_pCurBitmap = m_pCachedBitmap;
    104   m_pCurMask = m_pCachedMask;
    105   CalcSize();
    106 }
    107 
    108 int CPDF_ImageCacheEntry::Continue(IFX_PauseIndicator* pPause,
    109                                    CPDF_RenderStatus* pRenderStatus) {
    110   int ret = m_pCurBitmap.As<CPDF_DIBSource>()->ContinueLoadDIBSource(pPause);
    111   if (!ret) {
    112     m_pCurBitmap.Reset();
    113     return 0;
    114   }
    115   if (ret == 2)
    116     return ret;
    117 
    118   ContinueGetCachedBitmap(pRenderStatus);
    119   return 0;
    120 }
    121 
    122 void CPDF_ImageCacheEntry::CalcSize() {
    123   m_dwCacheSize = FPDF_ImageCache_EstimateImageSize(m_pCachedBitmap) +
    124                   FPDF_ImageCache_EstimateImageSize(m_pCachedMask);
    125 }
    126