text: // 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_imagecacheentry.h"
  
  #include <memory>
  #include <utility>
  
  #include "core/fpdfapi/page/cpdf_page.h"
  #include "core/fpdfapi/parser/cpdf_dictionary.h"
  #include "core/fpdfapi/parser/cpdf_document.h"
  #include "core/fpdfapi/parser/cpdf_stream.h"
  #include "core/fpdfapi/render/cpdf_dibsource.h"
  #include "core/fpdfapi/render/cpdf_pagerendercache.h"
  #include "core/fpdfapi/render/cpdf_rendercontext.h"
  #include "core/fpdfapi/render/cpdf_renderstatus.h"
  
  CPDF_ImageCacheEntry::CPDF_ImageCacheEntry(CPDF_Document* pDoc,
                                             CPDF_Stream* pStream)
      : m_dwTimeCount(0),
        m_MatteColor(0),
        m_pRenderStatus(nullptr),
        m_pDocument(pDoc),
        m_pStream(pStream),
        m_pCurBitmap(nullptr),
        m_pCurMask(nullptr),
        m_dwCacheSize(0) {}
  
  CPDF_ImageCacheEntry::~CPDF_ImageCacheEntry() {}
  
  void CPDF_ImageCacheEntry::Reset(const CFX_DIBitmap* pBitmap) {
    m_pCachedBitmap.reset();
    if (pBitmap)
      m_pCachedBitmap = pBitmap->Clone();
    CalcSize();
  }
  
  static uint32_t FPDF_ImageCache_EstimateImageSize(const CFX_DIBSource* pDIB) {
    return pDIB && pDIB->GetBuffer()
               ? (uint32_t)pDIB->GetHeight() * pDIB->GetPitch() +
                     (uint32_t)pDIB->GetPaletteSize() * 4
               : 0;
  }
  
  CFX_DIBSource* CPDF_ImageCacheEntry::DetachBitmap() {
    CFX_DIBSource* pDIBSource = m_pCurBitmap;
    m_pCurBitmap = nullptr;
    return pDIBSource;
  }
  
  CFX_DIBSource* CPDF_ImageCacheEntry::DetachMask() {
    CFX_DIBSource* pDIBSource = m_pCurMask;
    m_pCurMask = nullptr;
    return pDIBSource;
  }
  
  int CPDF_ImageCacheEntry::StartGetCachedBitmap(CPDF_Dictionary* pFormResources,
                                                 CPDF_Dictionary* pPageResources,
                                                 bool bStdCS,
                                                 uint32_t GroupFamily,
                                                 bool bLoadMask,
                                                 CPDF_RenderStatus* pRenderStatus,
                                                 int32_t downsampleWidth,
                                                 int32_t downsampleHeight) {
    if (m_pCachedBitmap) {
      m_pCurBitmap = m_pCachedBitmap.get();
      m_pCurMask = m_pCachedMask.get();
      return 1;
    }
    if (!pRenderStatus)
      return 0;
  
    m_pRenderStatus = pRenderStatus;
    m_pCurBitmap = new CPDF_DIBSource;
    int ret =
        ((CPDF_DIBSource*)m_pCurBitmap)
            ->StartLoadDIBSource(m_pDocument, m_pStream, true, pFormResources,
                                 pPageResources, bStdCS, GroupFamily, bLoadMask);
    if (ret == 2)
      return ret;
  
    if (!ret) {
      delete m_pCurBitmap;
      m_pCurBitmap = nullptr;
      return 0;
    }
    ContinueGetCachedBitmap();
    return 0;
  }
  
  void CPDF_ImageCacheEntry::ContinueGetCachedBitmap() {
    m_MatteColor = ((CPDF_DIBSource*)m_pCurBitmap)->GetMatteColor();
    m_pCurMask = ((CPDF_DIBSource*)m_pCurBitmap)->DetachMask();
    CPDF_RenderContext* pContext = m_pRenderStatus->GetContext();
    CPDF_PageRenderCache* pPageRenderCache = pContext->GetPageCache();
    m_dwTimeCount = pPageRenderCache->GetTimeCount();
    if (m_pCurBitmap->GetPitch() * m_pCurBitmap->GetHeight() <
        FPDF_HUGE_IMAGE_SIZE) {
      m_pCachedBitmap = m_pCurBitmap->Clone();
      delete m_pCurBitmap;
      m_pCurBitmap = nullptr;
    } else {
      m_pCachedBitmap = pdfium::WrapUnique<CFX_DIBSource>(m_pCurBitmap);
    }
    if (m_pCurMask) {
      m_pCachedMask = m_pCurMask->Clone();
      delete m_pCurMask;
      m_pCurMask = nullptr;
    }
    m_pCurBitmap = m_pCachedBitmap.get();
    m_pCurMask = m_pCachedMask.get();
    CalcSize();
  }
  
  int CPDF_ImageCacheEntry::Continue(IFX_Pause* pPause) {
    int ret = ((CPDF_DIBSource*)m_pCurBitmap)->ContinueLoadDIBSource(pPause);
    if (ret == 2)
      return ret;
  
    if (!ret) {
      delete m_pCurBitmap;
      m_pCurBitmap = nullptr;
      return 0;
    }
    ContinueGetCachedBitmap();
    return 0;
  }
  
  void CPDF_ImageCacheEntry::CalcSize() {
    m_dwCacheSize = FPDF_ImageCache_EstimateImageSize(m_pCachedBitmap.get()) +
                    FPDF_ImageCache_EstimateImageSize(m_pCachedMask.get());
  }
  