Rename CFX_DIBSource to CFX_DIBBase.

It is not a source from which you can get CFX_DIBs, but rather a
base class from which all DIBs inherit.

Do the same thing for the CPDF_DIBSource wrapper class.
Mechanical change apart from adding a one-line comment in cfx_dibbase.h

Change-Id: Id2bde87813ca301d9fafc55ce08d703dfc6a7184
Reviewed-on: https://pdfium-review.googlesource.com/41352
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

1 files changed, 0 insertions, 1350 deletions

diff --git a/core/fpdfapi/render/cpdf_dibsource.cpp b/core/fpdfapi/render/cpdf_dibsource.cpp
deleted file mode 100644
index 0c69852354..0000000000
--- a/core/fpdfapi/render/cpdf_dibsource.cpp
+++ /dev/null
@@ -1,1350 +0,0 @@
-// Copyright 2017 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_dibsource.h"
-
-#include <algorithm>
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "core/fpdfapi/cpdf_modulemgr.h"
-#include "core/fpdfapi/page/cpdf_docpagedata.h"
-#include "core/fpdfapi/page/cpdf_image.h"
-#include "core/fpdfapi/page/cpdf_imageobject.h"
-#include "core/fpdfapi/parser/cpdf_array.h"
-#include "core/fpdfapi/parser/cpdf_dictionary.h"
-#include "core/fpdfapi/parser/cpdf_document.h"
-#include "core/fpdfapi/parser/fpdf_parser_decode.h"
-#include "core/fpdfapi/render/cpdf_pagerendercache.h"
-#include "core/fpdfapi/render/cpdf_renderstatus.h"
-#include "core/fxcodec/codec/ccodec_basicmodule.h"
-#include "core/fxcodec/codec/ccodec_jbig2module.h"
-#include "core/fxcodec/codec/ccodec_jpegmodule.h"
-#include "core/fxcodec/codec/ccodec_jpxmodule.h"
-#include "core/fxcodec/codec/ccodec_scanlinedecoder.h"
-#include "core/fxcodec/codec/cjpx_decoder.h"
-#include "core/fxcodec/fx_codec.h"
-#include "core/fxcrt/cfx_fixedbufgrow.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "core/fxge/dib/cfx_dibitmap.h"
-#include "third_party/base/ptr_util.h"
-
-namespace {
-
-constexpr int kMaxImageDimension = 0x01FFFF;
-
-unsigned int GetBits8(const uint8_t* pData, uint64_t bitpos, size_t nbits) {
-  ASSERT(nbits == 1 || nbits == 2 || nbits == 4 || nbits == 8 || nbits == 16);
-  ASSERT((bitpos & (nbits - 1)) == 0);
-  unsigned int byte = pData[bitpos / 8];
-  if (nbits == 8)
-    return byte;
-
-  if (nbits == 16)
-    return byte * 256 + pData[bitpos / 8 + 1];
-
-  return (byte >> (8 - nbits - (bitpos % 8))) & ((1 << nbits) - 1);
-}
-
-bool GetBitValue(const uint8_t* pSrc, uint32_t pos) {
-  return pSrc[pos / 8] & (1 << (7 - pos % 8));
-}
-
-bool IsAllowedBPCValue(int bpc) {
-  return bpc == 1 || bpc == 2 || bpc == 4 || bpc == 8 || bpc == 16;
-}
-
-bool IsAllowedICCComponents(int nComp) {
-  return nComp == 1 || nComp == 3 || nComp == 4;
-}
-
-bool IsColorIndexOutOfBounds(uint8_t index, const DIB_COMP_DATA& comp_datum) {
-  return index < comp_datum.m_ColorKeyMin || index > comp_datum.m_ColorKeyMax;
-}
-
-bool AreColorIndicesOutOfBounds(const uint8_t* indices,
-                                const DIB_COMP_DATA* comp_data,
-                                size_t count) {
-  for (size_t i = 0; i < count; ++i) {
-    if (IsColorIndexOutOfBounds(indices[i], comp_data[i]))
-      return true;
-  }
-  return false;
-}
-
-// Wrapper class to use with std::unique_ptr for CJPX_Decoder.
-class JpxBitMapContext {
- public:
-  explicit JpxBitMapContext(CCodec_JpxModule* jpx_module)
-      : jpx_module_(jpx_module), decoder_(nullptr) {}
-
-  ~JpxBitMapContext() {}
-
-  void set_decoder(std::unique_ptr<CJPX_Decoder> decoder) {
-    decoder_ = std::move(decoder);
-  }
-
-  CJPX_Decoder* decoder() { return decoder_.get(); }
-
- private:
-  CCodec_JpxModule* const jpx_module_;  // Weak pointer.
-  std::unique_ptr<CJPX_Decoder> decoder_;
-
-  // Disallow evil constructors
-  JpxBitMapContext(const JpxBitMapContext&);
-  void operator=(const JpxBitMapContext&);
-};
-
-}  // namespace
-
-CPDF_DIBSource::CPDF_DIBSource() {}
-
-CPDF_DIBSource::~CPDF_DIBSource() {
-  if (m_pColorSpace && m_pDocument) {
-    auto* pPageData = m_pDocument->GetPageData();
-    if (pPageData) {
-      auto* pSpace = m_pColorSpace.Release();
-      pPageData->ReleaseColorSpace(pSpace->GetArray());
-    }
-  }
-}
-
-bool CPDF_DIBSource::Load(CPDF_Document* pDoc, const CPDF_Stream* pStream) {
-  if (!pStream)
-    return false;
-
-  m_pDocument = pDoc;
-  m_pDict = pStream->GetDict();
-  if (!m_pDict)
-    return false;
-
-  m_pStream = pStream;
-  m_Width = m_pDict->GetIntegerFor("Width");
-  m_Height = m_pDict->GetIntegerFor("Height");
-  if (m_Width <= 0 || m_Height <= 0 || m_Width > kMaxImageDimension ||
-      m_Height > kMaxImageDimension) {
-    return false;
-  }
-  m_GroupFamily = 0;
-  m_bLoadMask = false;
-  if (!LoadColorInfo(nullptr, nullptr))
-    return false;
-
-  if (m_bDoBpcCheck && (m_bpc == 0 || m_nComponents == 0))
-    return false;
-
-  FX_SAFE_UINT32 src_size =
-      CalculatePitch8(m_bpc, m_nComponents, m_Width) * m_Height;
-  if (!src_size.IsValid())
-    return false;
-
-  m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
-  m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
-  if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData())
-    return false;
-
-  if (CreateDecoder() == LoadState::kFail)
-    return false;
-
-  if (m_bImageMask) {
-    m_bpp = 1;
-    m_bpc = 1;
-    m_nComponents = 1;
-    m_AlphaFlag = 1;
-  } else if (m_bpc * m_nComponents == 1) {
-    m_bpp = 1;
-  } else if (m_bpc * m_nComponents <= 8) {
-    m_bpp = 8;
-  } else {
-    m_bpp = 24;
-  }
-  FX_SAFE_UINT32 pitch = CalculatePitch32(m_bpp, m_Width);
-  if (!pitch.IsValid())
-    return false;
-
-  m_pLineBuf.reset(FX_Alloc(uint8_t, pitch.ValueOrDie()));
-  LoadPalette();
-  if (m_bColorKey) {
-    m_bpp = 32;
-    m_AlphaFlag = 2;
-    pitch = CalculatePitch32(m_bpp, m_Width);
-    if (!pitch.IsValid())
-      return false;
-
-    m_pMaskedLine.reset(FX_Alloc(uint8_t, pitch.ValueOrDie()));
-  }
-  m_Pitch = pitch.ValueOrDie();
-  return true;
-}
-
-bool CPDF_DIBSource::ContinueToLoadMask() {
-  if (m_bImageMask) {
-    m_bpp = 1;
-    m_bpc = 1;
-    m_nComponents = 1;
-    m_AlphaFlag = 1;
-  } else if (m_bpc * m_nComponents == 1) {
-    m_bpp = 1;
-  } else if (m_bpc * m_nComponents <= 8) {
-    m_bpp = 8;
-  } else {
-    m_bpp = 24;
-  }
-  if (!m_bpc || !m_nComponents) {
-    return false;
-  }
-  FX_SAFE_UINT32 pitch = CalculatePitch32(m_bpp, m_Width);
-  if (!pitch.IsValid())
-    return false;
-
-  m_pLineBuf.reset(FX_Alloc(uint8_t, pitch.ValueOrDie()));
-  if (m_pColorSpace && m_bStdCS) {
-    m_pColorSpace->EnableStdConversion(true);
-  }
-  LoadPalette();
-  if (m_bColorKey) {
-    m_bpp = 32;
-    m_AlphaFlag = 2;
-    pitch = CalculatePitch32(m_bpp, m_Width);
-    if (!pitch.IsValid())
-      return false;
-    m_pMaskedLine.reset(FX_Alloc(uint8_t, pitch.ValueOrDie()));
-  }
-  m_Pitch = pitch.ValueOrDie();
-  return true;
-}
-
-CPDF_DIBSource::LoadState CPDF_DIBSource::StartLoadDIBSource(
-    CPDF_Document* pDoc,
-    const CPDF_Stream* pStream,
-    bool bHasMask,
-    const CPDF_Dictionary* pFormResources,
-    CPDF_Dictionary* pPageResources,
-    bool bStdCS,
-    uint32_t GroupFamily,
-    bool bLoadMask) {
-  if (!pStream)
-    return LoadState::kFail;
-
-  m_pDocument = pDoc;
-  m_pDict = pStream->GetDict();
-  m_pStream = pStream;
-  m_bStdCS = bStdCS;
-  m_bHasMask = bHasMask;
-  m_Width = m_pDict->GetIntegerFor("Width");
-  m_Height = m_pDict->GetIntegerFor("Height");
-  if (m_Width <= 0 || m_Height <= 0 || m_Width > kMaxImageDimension ||
-      m_Height > kMaxImageDimension) {
-    return LoadState::kFail;
-  }
-  m_GroupFamily = GroupFamily;
-  m_bLoadMask = bLoadMask;
-  if (!LoadColorInfo(m_pStream->IsInline() ? pFormResources : nullptr,
-                     pPageResources)) {
-    return LoadState::kFail;
-  }
-  if (m_bDoBpcCheck && (m_bpc == 0 || m_nComponents == 0))
-    return LoadState::kFail;
-
-  FX_SAFE_UINT32 src_size =
-      CalculatePitch8(m_bpc, m_nComponents, m_Width) * m_Height;
-  if (!src_size.IsValid())
-    return LoadState::kFail;
-
-  m_pStreamAcc = pdfium::MakeRetain<CPDF_StreamAcc>(pStream);
-  m_pStreamAcc->LoadAllData(false, src_size.ValueOrDie(), true);
-  if (m_pStreamAcc->GetSize() == 0 || !m_pStreamAcc->GetData())
-    return LoadState::kFail;
-
-  LoadState iCreatedDecoder = CreateDecoder();
-  if (iCreatedDecoder == LoadState::kFail)
-    return LoadState::kFail;
-
-  if (!ContinueToLoadMask())
-    return LoadState::kFail;
-
-  LoadState iLoadedMask = m_bHasMask ? StartLoadMask() : LoadState::kSuccess;
-  if (iCreatedDecoder == LoadState::kContinue ||
-      iLoadedMask == LoadState::kContinue) {
-    return LoadState::kContinue;
-  }
-
-  ASSERT(iCreatedDecoder == LoadState::kSuccess);
-  ASSERT(iLoadedMask == LoadState::kSuccess);
-  if (m_pColorSpace && m_bStdCS)
-    m_pColorSpace->EnableStdConversion(false);
-  return LoadState::kSuccess;
-}
-
-CPDF_DIBSource::LoadState CPDF_DIBSource::ContinueLoadDIBSource(
-    PauseIndicatorIface* pPause) {
-  if (m_Status == LoadState::kContinue)
-    return ContinueLoadMaskDIB(pPause);
-
-  if (m_Status == LoadState::kFail)
-    return LoadState::kFail;
-
-  if (m_pStreamAcc->GetImageDecoder() == "JPXDecode")
-    return LoadState::kFail;
-
-  FXCODEC_STATUS iDecodeStatus;
-  CCodec_Jbig2Module* pJbig2Module = CPDF_ModuleMgr::Get()->GetJbig2Module();
-  if (!m_pJbig2Context) {
-    m_pJbig2Context = pdfium::MakeUnique<CCodec_Jbig2Context>();
-    if (m_pStreamAcc->GetImageParam()) {
-      const CPDF_Stream* pGlobals =
-          m_pStreamAcc->GetImageParam()->GetStreamFor("JBIG2Globals");
-      if (pGlobals) {
-        m_pGlobalStream = pdfium::MakeRetain<CPDF_StreamAcc>(pGlobals);
-        m_pGlobalStream->LoadAllDataFiltered();
-      }
-    }
-    iDecodeStatus = pJbig2Module->StartDecode(
-        m_pJbig2Context.get(), m_pDocument->CodecContext(), m_Width, m_Height,
-        m_pStreamAcc, m_pGlobalStream, m_pCachedBitmap->GetBuffer(),
-        m_pCachedBitmap->GetPitch(), pPause);
-  } else {
-    iDecodeStatus = pJbig2Module->ContinueDecode(m_pJbig2Context.get(), pPause);
-  }
-
-  if (iDecodeStatus < 0) {
-    m_pJbig2Context.reset();
-    m_pCachedBitmap.Reset();
-    m_pGlobalStream.Reset();
-    return LoadState::kFail;
-  }
-  if (iDecodeStatus == FXCODEC_STATUS_DECODE_TOBECONTINUE)
-    return LoadState::kContinue;
-
-  LoadState iContinueStatus = LoadState::kSuccess;
-  if (m_bHasMask) {
-    if (ContinueLoadMaskDIB(pPause) == LoadState::kContinue) {
-      iContinueStatus = LoadState::kContinue;
-      m_Status = LoadState::kContinue;
-    }
-  }
-  if (iContinueStatus == LoadState::kContinue)
-    return LoadState::kContinue;
-
-  if (m_pColorSpace && m_bStdCS)
-    m_pColorSpace->EnableStdConversion(false);
-  return iContinueStatus;
-}
-
-bool CPDF_DIBSource::LoadColorInfo(const CPDF_Dictionary* pFormResources,
-                                   const CPDF_Dictionary* pPageResources) {
-  m_bpc_orig = m_pDict->GetIntegerFor("BitsPerComponent");
-  if (m_pDict->GetIntegerFor("ImageMask"))
-    m_bImageMask = true;
-
-  if (m_bImageMask || !m_pDict->KeyExist("ColorSpace")) {
-    if (!m_bImageMask) {
-      const CPDF_Object* pFilter = m_pDict->GetDirectObjectFor("Filter");
-      if (pFilter) {
-        ByteString filter;
-        if (pFilter->IsName()) {
-          filter = pFilter->GetString();
-        } else if (const CPDF_Array* pArray = pFilter->AsArray()) {
-          filter = pArray->GetStringAt(pArray->GetCount() - 1);
-        }
-
-        if (filter == "JPXDecode") {
-          m_bDoBpcCheck = false;
-          return true;
-        }
-      }
-    }
-    m_bImageMask = true;
-    m_bpc = m_nComponents = 1;
-    const CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
-    m_bDefaultDecode = !pDecode || !pDecode->GetIntegerAt(0);
-    return true;
-  }
-
-  const CPDF_Object* pCSObj = m_pDict->GetDirectObjectFor("ColorSpace");
-  if (!pCSObj)
-    return false;
-
-  CPDF_DocPageData* pDocPageData = m_pDocument->GetPageData();
-  if (pFormResources)
-    m_pColorSpace = pDocPageData->GetColorSpace(pCSObj, pFormResources);
-  if (!m_pColorSpace)
-    m_pColorSpace = pDocPageData->GetColorSpace(pCSObj, pPageResources);
-  if (!m_pColorSpace)
-    return false;
-
-  m_Family = m_pColorSpace->GetFamily();
-  m_nComponents = m_pColorSpace->CountComponents();
-  if (m_Family == PDFCS_ICCBASED && pCSObj->IsName()) {
-    ByteString cs = pCSObj->GetString();
-    if (cs == "DeviceGray")
-      m_nComponents = 1;
-    else if (cs == "DeviceRGB")
-      m_nComponents = 3;
-    else if (cs == "DeviceCMYK")
-      m_nComponents = 4;
-  }
-  ValidateDictParam();
-  return GetDecodeAndMaskArray(&m_bDefaultDecode, &m_bColorKey);
-}
-
-bool CPDF_DIBSource::GetDecodeAndMaskArray(bool* bDefaultDecode,
-                                           bool* bColorKey) {
-  if (!m_pColorSpace)
-    return false;
-
-  m_CompData.resize(m_nComponents);
-  int max_data = (1 << m_bpc) - 1;
-  const CPDF_Array* pDecode = m_pDict->GetArrayFor("Decode");
-  if (pDecode) {
-    for (uint32_t i = 0; i < m_nComponents; i++) {
-      m_CompData[i].m_DecodeMin = pDecode->GetNumberAt(i * 2);
-      float max = pDecode->GetNumberAt(i * 2 + 1);
-      m_CompData[i].m_DecodeStep = (max - m_CompData[i].m_DecodeMin) / max_data;
-      float def_value;
-      float def_min;
-      float def_max;
-      m_pColorSpace->GetDefaultValue(i, &def_value, &def_min, &def_max);
-      if (m_Family == PDFCS_INDEXED)
-        def_max = max_data;
-      if (def_min != m_CompData[i].m_DecodeMin || def_max != max)
-        *bDefaultDecode = false;
-    }
-  } else {
-    for (uint32_t i = 0; i < m_nComponents; i++) {
-      float def_value;
-      m_pColorSpace->GetDefaultValue(i, &def_value, &m_CompData[i].m_DecodeMin,
-                                     &m_CompData[i].m_DecodeStep);
-      if (m_Family == PDFCS_INDEXED)
-        m_CompData[i].m_DecodeStep = max_data;
-      m_CompData[i].m_DecodeStep =
-          (m_CompData[i].m_DecodeStep - m_CompData[i].m_DecodeMin) / max_data;
-    }
-  }
-  if (m_pDict->KeyExist("SMask"))
-    return true;
-
-  const CPDF_Object* pMask = m_pDict->GetDirectObjectFor("Mask");
-  if (!pMask)
-    return true;
-
-  if (const CPDF_Array* pArray = pMask->AsArray()) {
-    if (pArray->GetCount() >= m_nComponents * 2) {
-      for (uint32_t i = 0; i < m_nComponents; i++) {
-        int min_num = pArray->GetIntegerAt(i * 2);
-        int max_num = pArray->GetIntegerAt(i * 2 + 1);
-        m_CompData[i].m_ColorKeyMin = std::max(min_num, 0);
-        m_CompData[i].m_ColorKeyMax = std::min(max_num, max_data);
-      }
-    }
-    *bColorKey = true;
-  }
-  return true;
-}
-
-CPDF_DIBSource::LoadState CPDF_DIBSource::CreateDecoder() {
-  ByteString decoder = m_pStreamAcc->GetImageDecoder();
-  if (decoder.IsEmpty())
-    return LoadState::kSuccess;
-
-  if (m_bDoBpcCheck && m_bpc == 0)
-    return LoadState::kFail;
-
-  if (decoder == "JPXDecode") {
-    m_pCachedBitmap = LoadJpxBitmap();
-    return m_pCachedBitmap ? LoadState::kSuccess : LoadState::kFail;
-  }
-
-  if (decoder == "JBIG2Decode") {
-    m_pCachedBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
-    if (!m_pCachedBitmap->Create(
-            m_Width, m_Height, m_bImageMask ? FXDIB_1bppMask : FXDIB_1bppRgb)) {
-      m_pCachedBitmap.Reset();
-      return LoadState::kFail;
-    }
-    m_Status = LoadState::kSuccess;
-    return LoadState::kContinue;
-  }
-
-  const uint8_t* src_data = m_pStreamAcc->GetData();
-  uint32_t src_size = m_pStreamAcc->GetSize();
-  const CPDF_Dictionary* pParams = m_pStreamAcc->GetImageParam();
-  if (decoder == "CCITTFaxDecode") {
-    m_pDecoder = FPDFAPI_CreateFaxDecoder(src_data, src_size, m_Width, m_Height,
-                                          pParams);
-  } else if (decoder == "FlateDecode") {
-    m_pDecoder = FPDFAPI_CreateFlateDecoder(
-        src_data, src_size, m_Width, m_Height, m_nComponents, m_bpc, pParams);
-  } else if (decoder == "RunLengthDecode") {
-    CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
-    m_pDecoder = pEncoders->GetBasicModule()->CreateRunLengthDecoder(
-        src_data, src_size, m_Width, m_Height, m_nComponents, m_bpc);
-  } else if (decoder == "DCTDecode") {
-    if (!CreateDCTDecoder(src_data, src_size, pParams))
-      return LoadState::kFail;
-  }
-  if (!m_pDecoder)
-    return LoadState::kFail;
-
-  FX_SAFE_UINT32 requested_pitch =
-      CalculatePitch8(m_bpc, m_nComponents, m_Width);
-  if (!requested_pitch.IsValid())
-    return LoadState::kFail;
-  FX_SAFE_UINT32 provided_pitch = CalculatePitch8(
-      m_pDecoder->GetBPC(), m_pDecoder->CountComps(), m_pDecoder->GetWidth());
-  if (!provided_pitch.IsValid())
-    return LoadState::kFail;
-  if (provided_pitch.ValueOrDie() < requested_pitch.ValueOrDie())
-    return LoadState::kFail;
-  return LoadState::kSuccess;
-}
-
-bool CPDF_DIBSource::CreateDCTDecoder(const uint8_t* src_data,
-                                      uint32_t src_size,
-                                      const CPDF_Dictionary* pParams) {
-  CCodec_JpegModule* pJpegModule = CPDF_ModuleMgr::Get()->GetJpegModule();
-  m_pDecoder = pJpegModule->CreateDecoder(
-      src_data, src_size, m_Width, m_Height, m_nComponents,
-      !pParams || pParams->GetIntegerFor("ColorTransform", 1));
-  if (m_pDecoder)
-    return true;
-
-  bool bTransform = false;
-  int comps;
-  int bpc;
-  if (!pJpegModule->LoadInfo(src_data, src_size, &m_Width, &m_Height, &comps,
-                             &bpc, &bTransform)) {
-    return false;
-  }
-
-  if (m_nComponents == static_cast<uint32_t>(comps)) {
-    m_bpc = bpc;
-    m_pDecoder = pJpegModule->CreateDecoder(
-        src_data, src_size, m_Width, m_Height, m_nComponents, bTransform);
-    return true;
-  }
-
-  m_nComponents = static_cast<uint32_t>(comps);
-  m_CompData.clear();
-  if (m_pColorSpace) {
-    switch (m_Family) {
-      case PDFCS_DEVICEGRAY:
-      case PDFCS_DEVICERGB:
-      case PDFCS_DEVICECMYK: {
-        uint32_t dwMinComps = ComponentsForFamily(m_Family);
-        if (m_pColorSpace->CountComponents() < dwMinComps ||
-            m_nComponents < dwMinComps) {
-          return false;
-        }
-        break;
-      }
-      case PDFCS_LAB: {
-        if (m_nComponents != 3 || m_pColorSpace->CountComponents() < 3)
-          return false;
-        break;
-      }
-      case PDFCS_ICCBASED: {
-        if (!IsAllowedICCComponents(m_nComponents) ||
-            !IsAllowedICCComponents(m_pColorSpace->CountComponents()) ||
-            m_pColorSpace->CountComponents() < m_nComponents) {
-          return false;
-        }
-        break;
-      }
-      default: {
-        if (m_pColorSpace->CountComponents() != m_nComponents)
-          return false;
-        break;
-      }
-    }
-  } else {
-    if (m_Family == PDFCS_LAB && m_nComponents != 3)
-      return false;
-  }
-  if (!GetDecodeAndMaskArray(&m_bDefaultDecode, &m_bColorKey))
-    return false;
-
-  m_bpc = bpc;
-  m_pDecoder = pJpegModule->CreateDecoder(src_data, src_size, m_Width, m_Height,
-                                          m_nComponents, bTransform);
-  return true;
-}
-
-RetainPtr<CFX_DIBitmap> CPDF_DIBSource::LoadJpxBitmap() {
-  CCodec_JpxModule* pJpxModule = CPDF_ModuleMgr::Get()->GetJpxModule();
-  auto context = pdfium::MakeUnique<JpxBitMapContext>(pJpxModule);
-  context->set_decoder(pJpxModule->CreateDecoder(
-      m_pStreamAcc->GetData(), m_pStreamAcc->GetSize(), m_pColorSpace.Get()));
-  if (!context->decoder())
-    return nullptr;
-
-  uint32_t width = 0;
-  uint32_t height = 0;
-  uint32_t components = 0;
-  pJpxModule->GetImageInfo(context->decoder(), &width, &height, &components);
-  if (static_cast<int>(width) < m_Width || static_cast<int>(height) < m_Height)
-    return nullptr;
-
-  bool bSwapRGB = false;
-  if (m_pColorSpace) {
-    if (components != m_pColorSpace->CountComponents())
-      return nullptr;
-
-    if (m_pColorSpace == CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB)) {
-      bSwapRGB = true;
-      m_pColorSpace = nullptr;
-    }
-  } else {
-    if (components == 3) {
-      bSwapRGB = true;
-    } else if (components == 4) {
-      m_pColorSpace = CPDF_ColorSpace::GetStockCS(PDFCS_DEVICECMYK);
-    }
-    m_nComponents = components;
-  }
-
-  FXDIB_Format format;
-  if (components == 1) {
-    format = FXDIB_8bppRgb;
-  } else if (components <= 3) {
-    format = FXDIB_Rgb;
-  } else if (components == 4) {
-    format = FXDIB_Rgb32;
-  } else {
-    width = (width * components + 2) / 3;
-    format = FXDIB_Rgb;
-  }
-
-  auto pCachedBitmap = pdfium::MakeRetain<CFX_DIBitmap>();
-  if (!pCachedBitmap->Create(width, height, format))
-    return nullptr;
-
-  pCachedBitmap->Clear(0xFFFFFFFF);
-  std::vector<uint8_t> output_offsets(components);
-  for (uint32_t i = 0; i < components; ++i)
-    output_offsets[i] = i;
-  if (bSwapRGB) {
-    output_offsets[0] = 2;
-    output_offsets[2] = 0;
-  }
-  if (!pJpxModule->Decode(context->decoder(), pCachedBitmap->GetBuffer(),
-                          pCachedBitmap->GetPitch(), output_offsets)) {
-    return nullptr;
-  }
-
-  if (m_pColorSpace && m_pColorSpace->GetFamily() == PDFCS_INDEXED &&
-      m_bpc < 8) {
-    int scale = 8 - m_bpc;
-    for (uint32_t row = 0; row < height; ++row) {
-      uint8_t* scanline = pCachedBitmap->GetWritableScanline(row);
-      for (uint32_t col = 0; col < width; ++col) {
-        *scanline = (*scanline) >> scale;
-        ++scanline;
-      }
-    }
-  }
-  m_bpc = 8;
-  return pCachedBitmap;
-}
-
-CPDF_DIBSource::LoadState CPDF_DIBSource::StartLoadMask() {
-  m_MatteColor = 0XFFFFFFFF;
-  m_pMaskStream = m_pDict->GetStreamFor("SMask");
-  if (!m_pMaskStream) {
-    m_pMaskStream = ToStream(m_pDict->GetDirectObjectFor("Mask"));
-    return m_pMaskStream ? StartLoadMaskDIB() : LoadState::kSuccess;
-  }
-
-  const CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArrayFor("Matte");
-  if (pMatte && m_pColorSpace && m_Family != PDFCS_PATTERN &&
-      m_pColorSpace->CountComponents() <= m_nComponents) {
-    std::vector<float> colors(m_nComponents);
-    for (uint32_t i = 0; i < m_nComponents; i++)
-      colors[i] = pMatte->GetFloatAt(i);
-
-    float R;
-    float G;
-    float B;
-    m_pColorSpace->GetRGB(colors.data(), &R, &G, &B);
-    m_MatteColor = ArgbEncode(0, FXSYS_round(R * 255), FXSYS_round(G * 255),
-                              FXSYS_round(B * 255));
-  }
-  return StartLoadMaskDIB();
-}
-
-CPDF_DIBSource::LoadState CPDF_DIBSource::ContinueLoadMaskDIB(
-    PauseIndicatorIface* pPause) {
-  if (!m_pMask)
-    return LoadState::kSuccess;
-
-  LoadState ret = m_pMask->ContinueLoadDIBSource(pPause);
-  if (ret == LoadState::kContinue)
-    return LoadState::kContinue;
-
-  if (m_pColorSpace && m_bStdCS)
-    m_pColorSpace->EnableStdConversion(false);
-
-  if (ret == LoadState::kFail) {
-    m_pMask.Reset();
-    return LoadState::kFail;
-  }
-  return LoadState::kSuccess;
-}
-
-RetainPtr<CPDF_DIBSource> CPDF_DIBSource::DetachMask() {
-  return std::move(m_pMask);
-}
-
-bool CPDF_DIBSource::IsJBigImage() const {
-  return m_pStreamAcc->GetImageDecoder() == "JBIG2Decode";
-}
-
-CPDF_DIBSource::LoadState CPDF_DIBSource::StartLoadMaskDIB() {
-  m_pMask = pdfium::MakeRetain<CPDF_DIBSource>();
-  LoadState ret =
-      m_pMask->StartLoadDIBSource(m_pDocument.Get(), m_pMaskStream.Get(), false,
-                                  nullptr, nullptr, true, 0, false);
-  if (ret == LoadState::kContinue) {
-    if (m_Status == LoadState::kFail)
-      m_Status = LoadState::kContinue;
-    return LoadState::kContinue;
-  }
-  if (ret == LoadState::kFail)
-    m_pMask.Reset();
-  return LoadState::kSuccess;
-}
-
-void CPDF_DIBSource::LoadPalette() {
-  if (!m_pColorSpace || m_Family == PDFCS_PATTERN)
-    return;
-
-  if (m_bpc == 0 || m_bpc * m_nComponents > 8)
-    return;
-
-  if (m_bpc * m_nComponents == 1) {
-    if (m_bDefaultDecode &&
-        (m_Family == PDFCS_DEVICEGRAY || m_Family == PDFCS_DEVICERGB)) {
-      return;
-    }
-    if (m_pColorSpace->CountComponents() > 3) {
-      return;
-    }
-    float color_values[3];
-    color_values[0] = m_CompData[0].m_DecodeMin;
-    color_values[1] = color_values[0];
-    color_values[2] = color_values[0];
-
-    float R = 0.0f;
-    float G = 0.0f;
-    float B = 0.0f;
-    m_pColorSpace->GetRGB(color_values, &R, &G, &B);
-
-    FX_ARGB argb0 = ArgbEncode(255, FXSYS_round(R * 255), FXSYS_round(G * 255),
-                               FXSYS_round(B * 255));
-    color_values[0] += m_CompData[0].m_DecodeStep;
-    color_values[1] += m_CompData[0].m_DecodeStep;
-    color_values[2] += m_CompData[0].m_DecodeStep;
-    m_pColorSpace->GetRGB(color_values, &R, &G, &B);
-    FX_ARGB argb1 = ArgbEncode(255, FXSYS_round(R * 255), FXSYS_round(G * 255),
-                               FXSYS_round(B * 255));
-    if (argb0 != 0xFF000000 || argb1 != 0xFFFFFFFF) {
-      SetPaletteArgb(0, argb0);
-      SetPaletteArgb(1, argb1);
-    }
-    return;
-  }
-  if (m_bpc == 8 && m_bDefaultDecode &&
-      m_pColorSpace == CPDF_ColorSpace::GetStockCS(PDFCS_DEVICEGRAY)) {
-    return;
-  }
-
-  int palette_count = 1 << (m_bpc * m_nComponents);
-  // Using at least 16 elements due to the call m_pColorSpace->GetRGB().
-  std::vector<float> color_values(std::max(m_nComponents, 16u));
-  for (int i = 0; i < palette_count; i++) {
-    int color_data = i;
-    for (uint32_t j = 0; j < m_nComponents; j++) {
-      int encoded_component = color_data % (1 << m_bpc);
-      color_data /= 1 << m_bpc;
-      color_values[j] = m_CompData[j].m_DecodeMin +
-                        m_CompData[j].m_DecodeStep * encoded_component;
-    }
-    float R = 0;
-    float G = 0;
-    float B = 0;
-    if (m_nComponents == 1 && m_Family == PDFCS_ICCBASED &&
-        m_pColorSpace->CountComponents() > 1) {
-      int nComponents = m_pColorSpace->CountComponents();
-      std::vector<float> temp_buf(nComponents);
-      for (int k = 0; k < nComponents; ++k)
-        temp_buf[k] = color_values[0];
-      m_pColorSpace->GetRGB(temp_buf.data(), &R, &G, &B);
-    } else {
-      m_pColorSpace->GetRGB(color_values.data(), &R, &G, &B);
-    }
-    SetPaletteArgb(i, ArgbEncode(255, FXSYS_round(R * 255),
-                                 FXSYS_round(G * 255), FXSYS_round(B * 255)));
-  }
-}
-
-void CPDF_DIBSource::ValidateDictParam() {
-  m_bpc = m_bpc_orig;
-  const CPDF_Object* pFilter = m_pDict->GetDirectObjectFor("Filter");
-  if (pFilter) {
-    if (pFilter->IsName()) {
-      ByteString filter = pFilter->GetString();
-      if (filter == "CCITTFaxDecode" || filter == "JBIG2Decode") {
-        m_bpc = 1;
-        m_nComponents = 1;
-      } else if (filter == "RunLengthDecode") {
-        if (m_bpc != 1) {
-          m_bpc = 8;
-        }
-      } else if (filter == "DCTDecode") {
-        m_bpc = 8;
-      }
-    } else if (const CPDF_Array* pArray = pFilter->AsArray()) {
-      ByteString filter = pArray->GetStringAt(pArray->GetCount() - 1);
-      if (filter == "CCITTFaxDecode" || filter == "JBIG2Decode") {
-        m_bpc = 1;
-        m_nComponents = 1;
-      } else if (filter == "DCTDecode") {
-        // Previously, filter == "RunLengthDecode" was checked in the "if"
-        // statement as well, but too many documents don't conform to it.
-        m_bpc = 8;
-      }
-    }
-  }
-
-  if (!IsAllowedBPCValue(m_bpc))
-    m_bpc = 0;
-}
-
-void CPDF_DIBSource::TranslateScanline24bpp(uint8_t* dest_scan,
-                                            const uint8_t* src_scan) const {
-  if (m_bpc == 0)
-    return;
-
-  if (TranslateScanline24bppDefaultDecode(dest_scan, src_scan))
-    return;
-
-  // Using at least 16 elements due to the call m_pColorSpace->GetRGB().
-  std::vector<float> color_values(std::max(m_nComponents, 16u));
-  float R = 0.0f;
-  float G = 0.0f;
-  float B = 0.0f;
-  uint64_t src_bit_pos = 0;
-  uint64_t src_byte_pos = 0;
-  size_t dest_byte_pos = 0;
-  const bool bpp8 = m_bpc == 8;
-  for (int column = 0; column < m_Width; column++) {
-    for (uint32_t color = 0; color < m_nComponents; color++) {
-      if (bpp8) {
-        uint8_t data = src_scan[src_byte_pos++];
-        color_values[color] = m_CompData[color].m_DecodeMin +
-                              m_CompData[color].m_DecodeStep * data;
-      } else {
-        unsigned int data = GetBits8(src_scan, src_bit_pos, m_bpc);
-        color_values[color] = m_CompData[color].m_DecodeMin +
-                              m_CompData[color].m_DecodeStep * data;
-        src_bit_pos += m_bpc;
-      }
-    }
-
-    if (TransMask()) {
-      float k = 1.0f - color_values[3];
-      R = (1.0f - color_values[0]) * k;
-      G = (1.0f - color_values[1]) * k;
-      B = (1.0f - color_values[2]) * k;
-    } else if (m_Family != PDFCS_PATTERN) {
-      m_pColorSpace->GetRGB(color_values.data(), &R, &G, &B);
-    }
-    R = pdfium::clamp(R, 0.0f, 1.0f);
-    G = pdfium::clamp(G, 0.0f, 1.0f);
-    B = pdfium::clamp(B, 0.0f, 1.0f);
-    dest_scan[dest_byte_pos] = static_cast<uint8_t>(B * 255);
-    dest_scan[dest_byte_pos + 1] = static_cast<uint8_t>(G * 255);
-    dest_scan[dest_byte_pos + 2] = static_cast<uint8_t>(R * 255);
-    dest_byte_pos += 3;
-  }
-}
-
-bool CPDF_DIBSource::TranslateScanline24bppDefaultDecode(
-    uint8_t* dest_scan,
-    const uint8_t* src_scan) const {
-  if (!m_bDefaultDecode)
-    return false;
-
-  if (m_Family != PDFCS_DEVICERGB && m_Family != PDFCS_CALRGB) {
-    if (m_bpc != 8)
-      return false;
-
-    if (m_nComponents == m_pColorSpace->CountComponents()) {
-      m_pColorSpace->TranslateImageLine(dest_scan, src_scan, m_Width, m_Width,
-                                        m_Height, TransMask());
-    }
-    return true;
-  }
-
-  if (m_nComponents != 3)
-    return true;
-
-  const uint8_t* src_pos = src_scan;
-  switch (m_bpc) {
-    case 8:
-      for (int column = 0; column < m_Width; column++) {
-        *dest_scan++ = src_pos[2];
-        *dest_scan++ = src_pos[1];
-        *dest_scan++ = *src_pos;
-        src_pos += 3;
-      }
-      break;
-    case 16:
-      for (int col = 0; col < m_Width; col++) {
-        *dest_scan++ = src_pos[4];
-        *dest_scan++ = src_pos[2];
-        *dest_scan++ = *src_pos;
-        src_pos += 6;
-      }
-      break;
-    default:
-      const unsigned int max_data = (1 << m_bpc) - 1;
-      uint64_t src_bit_pos = 0;
-      size_t dest_byte_pos = 0;
-      for (int column = 0; column < m_Width; column++) {
-        unsigned int R = GetBits8(src_scan, src_bit_pos, m_bpc);
-        src_bit_pos += m_bpc;
-        unsigned int G = GetBits8(src_scan, src_bit_pos, m_bpc);
-        src_bit_pos += m_bpc;
-        unsigned int B = GetBits8(src_scan, src_bit_pos, m_bpc);
-        src_bit_pos += m_bpc;
-        R = std::min(R, max_data);
-        G = std::min(G, max_data);
-        B = std::min(B, max_data);
-        dest_scan[dest_byte_pos] = B * 255 / max_data;
-        dest_scan[dest_byte_pos + 1] = G * 255 / max_data;
-        dest_scan[dest_byte_pos + 2] = R * 255 / max_data;
-        dest_byte_pos += 3;
-      }
-      break;
-  }
-  return true;
-}
-
-uint8_t* CPDF_DIBSource::GetBuffer() const {
-  return m_pCachedBitmap ? m_pCachedBitmap->GetBuffer() : nullptr;
-}
-
-const uint8_t* CPDF_DIBSource::GetScanline(int line) const {
-  if (m_bpc == 0)
-    return nullptr;
-
-  FX_SAFE_UINT32 src_pitch = CalculatePitch8(m_bpc, m_nComponents, m_Width);
-  if (!src_pitch.IsValid())
-    return nullptr;
-  uint32_t src_pitch_value = src_pitch.ValueOrDie();
-
-  const uint8_t* pSrcLine = nullptr;
-  if (m_pCachedBitmap && src_pitch_value <= m_pCachedBitmap->GetPitch()) {
-    if (line >= m_pCachedBitmap->GetHeight()) {
-      line = m_pCachedBitmap->GetHeight() - 1;
-    }
-    pSrcLine = m_pCachedBitmap->GetScanline(line);
-  } else if (m_pDecoder) {
-    pSrcLine = m_pDecoder->GetScanline(line);
-  } else if (m_pStreamAcc->GetSize() >= (line + 1) * src_pitch_value) {
-    pSrcLine = m_pStreamAcc->GetData() + line * src_pitch_value;
-  }
-  if (!pSrcLine) {
-    uint8_t* pLineBuf = m_pMaskedLine ? m_pMaskedLine.get() : m_pLineBuf.get();
-    memset(pLineBuf, 0xFF, m_Pitch);
-    return pLineBuf;
-  }
-
-  if (m_bpc * m_nComponents == 1) {
-    if (m_bImageMask && m_bDefaultDecode) {
-      for (uint32_t i = 0; i < src_pitch_value; i++)
-        m_pLineBuf.get()[i] = ~pSrcLine[i];
-      return m_pLineBuf.get();
-    }
-
-    if (!m_bColorKey) {
-      memcpy(m_pLineBuf.get(), pSrcLine, src_pitch_value);
-      return m_pLineBuf.get();
-    }
-
-    uint32_t reset_argb = m_pPalette ? m_pPalette.get()[0] : 0xFF000000;
-    uint32_t set_argb = m_pPalette ? m_pPalette.get()[1] : 0xFFFFFFFF;
-    if (m_CompData[0].m_ColorKeyMin == 0)
-      reset_argb = 0;
-    if (m_CompData[0].m_ColorKeyMax == 1)
-      set_argb = 0;
-    set_argb = FXARGB_TODIB(set_argb);
-    reset_argb = FXARGB_TODIB(reset_argb);
-    uint32_t* dest_scan = reinterpret_cast<uint32_t*>(m_pMaskedLine.get());
-    for (int col = 0; col < m_Width; col++) {
-      *dest_scan = GetBitValue(pSrcLine, col) ? set_argb : reset_argb;
-      dest_scan++;
-    }
-    return m_pMaskedLine.get();
-  }
-  if (m_bpc * m_nComponents <= 8) {
-    if (m_bpc == 8) {
-      memcpy(m_pLineBuf.get(), pSrcLine, src_pitch_value);
-    } else {
-      uint64_t src_bit_pos = 0;
-      for (int col = 0; col < m_Width; col++) {
-        unsigned int color_index = 0;
-        for (uint32_t color = 0; color < m_nComponents; color++) {
-          unsigned int data = GetBits8(pSrcLine, src_bit_pos, m_bpc);
-          color_index |= data << (color * m_bpc);
-          src_bit_pos += m_bpc;
-        }
-        m_pLineBuf.get()[col] = color_index;
-      }
-    }
-    if (!m_bColorKey)
-      return m_pLineBuf.get();
-
-    uint8_t* pDestPixel = m_pMaskedLine.get();
-    const uint8_t* pSrcPixel = m_pLineBuf.get();
-    for (int col = 0; col < m_Width; col++) {
-      uint8_t index = *pSrcPixel++;
-      if (m_pPalette) {
-        *pDestPixel++ = FXARGB_B(m_pPalette.get()[index]);
-        *pDestPixel++ = FXARGB_G(m_pPalette.get()[index]);
-        *pDestPixel++ = FXARGB_R(m_pPalette.get()[index]);
-      } else {
-        *pDestPixel++ = index;
-        *pDestPixel++ = index;
-        *pDestPixel++ = index;
-      }
-      *pDestPixel = IsColorIndexOutOfBounds(index, m_CompData[0]) ? 0xFF : 0;
-      pDestPixel++;
-    }
-    return m_pMaskedLine.get();
-  }
-  if (m_bColorKey) {
-    if (m_nComponents == 3 && m_bpc == 8) {
-      uint8_t* alpha_channel = m_pMaskedLine.get() + 3;
-      for (int col = 0; col < m_Width; col++) {
-        const uint8_t* pPixel = pSrcLine + col * 3;
-        alpha_channel[col * 4] =
-            AreColorIndicesOutOfBounds(pPixel, m_CompData.data(), 3) ? 0xFF : 0;
-      }
-    } else {
-      memset(m_pMaskedLine.get(), 0xFF, m_Pitch);
-    }
-  }
-  if (m_pColorSpace) {
-    TranslateScanline24bpp(m_pLineBuf.get(), pSrcLine);
-    pSrcLine = m_pLineBuf.get();
-  }
-  if (!m_bColorKey)
-    return pSrcLine;
-
-  const uint8_t* pSrcPixel = pSrcLine;
-  uint8_t* pDestPixel = m_pMaskedLine.get();
-  for (int col = 0; col < m_Width; col++) {
-    *pDestPixel++ = *pSrcPixel++;
-    *pDestPixel++ = *pSrcPixel++;
-    *pDestPixel++ = *pSrcPixel++;
-    pDestPixel++;
-  }
-  return m_pMaskedLine.get();
-}
-
-bool CPDF_DIBSource::SkipToScanline(int line,
-                                    PauseIndicatorIface* pPause) const {
-  return m_pDecoder && m_pDecoder->SkipToScanline(line, pPause);
-}
-
-void CPDF_DIBSource::DownSampleScanline(int line,
-                                        uint8_t* dest_scan,
-                                        int dest_bpp,
-                                        int dest_width,
-                                        bool bFlipX,
-                                        int clip_left,
-                                        int clip_width) const {
-  if (line < 0 || !dest_scan || dest_bpp <= 0 || dest_width <= 0 ||
-      clip_left < 0 || clip_width <= 0) {
-    return;
-  }
-
-  uint32_t src_width = m_Width;
-  FX_SAFE_UINT32 pitch = CalculatePitch8(m_bpc, m_nComponents, m_Width);
-  if (!pitch.IsValid())
-    return;
-
-  const uint8_t* pSrcLine = nullptr;
-  if (m_pCachedBitmap) {
-    pSrcLine = m_pCachedBitmap->GetScanline(line);
-  } else if (m_pDecoder) {
-    pSrcLine = m_pDecoder->GetScanline(line);
-  } else {
-    uint32_t src_pitch = pitch.ValueOrDie();
-    pitch *= (line + 1);
-    if (!pitch.IsValid()) {
-      return;
-    }
-
-    if (m_pStreamAcc->GetSize() >= pitch.ValueOrDie()) {
-      pSrcLine = m_pStreamAcc->GetData() + line * src_pitch;
-    }
-  }
-  int orig_Bpp = m_bpc * m_nComponents / 8;
-  int dest_Bpp = dest_bpp / 8;
-  if (!pSrcLine) {
-    memset(dest_scan, 0xFF, dest_Bpp * clip_width);
-    return;
-  }
-
-  FX_SAFE_INT32 max_src_x = clip_left;
-  max_src_x += clip_width - 1;
-  max_src_x *= src_width;
-  max_src_x /= dest_width;
-  if (!max_src_x.IsValid())
-    return;
-
-  if (m_bpc * m_nComponents == 1) {
-    DownSampleScanline1Bit(orig_Bpp, dest_Bpp, src_width, pSrcLine, dest_scan,
-                           dest_width, bFlipX, clip_left, clip_width);
-  } else if (m_bpc * m_nComponents <= 8) {
-    DownSampleScanline8Bit(orig_Bpp, dest_Bpp, src_width, pSrcLine, dest_scan,
-                           dest_width, bFlipX, clip_left, clip_width);
-  } else {
-    DownSampleScanline32Bit(orig_Bpp, dest_Bpp, src_width, pSrcLine, dest_scan,
-                            dest_width, bFlipX, clip_left, clip_width);
-  }
-}
-
-void CPDF_DIBSource::DownSampleScanline1Bit(int orig_Bpp,
-                                            int dest_Bpp,
-                                            uint32_t src_width,
-                                            const uint8_t* pSrcLine,
-                                            uint8_t* dest_scan,
-                                            int dest_width,
-                                            bool bFlipX,
-                                            int clip_left,
-                                            int clip_width) const {
-  if (m_bColorKey && !m_bImageMask) {
-    uint32_t reset_argb = m_pPalette ? m_pPalette.get()[0] : 0xFF000000;
-    uint32_t set_argb = m_pPalette ? m_pPalette.get()[1] : 0xFFFFFFFF;
-    if (m_CompData[0].m_ColorKeyMin == 0)
-      reset_argb = 0;
-    if (m_CompData[0].m_ColorKeyMax == 1)
-      set_argb = 0;
-    set_argb = FXARGB_TODIB(set_argb);
-    reset_argb = FXARGB_TODIB(reset_argb);
-    uint32_t* dest_scan_dword = reinterpret_cast<uint32_t*>(dest_scan);
-    for (int i = 0; i < clip_width; i++) {
-      uint32_t src_x = (clip_left + i) * src_width / dest_width;
-      if (bFlipX)
-        src_x = src_width - src_x - 1;
-      src_x %= src_width;
-      dest_scan_dword[i] = GetBitValue(pSrcLine, src_x) ? set_argb : reset_argb;
-    }
-    return;
-  }
-
-  uint32_t set_argb = 0xFFFFFFFF;
-  uint32_t reset_argb = 0;
-  if (m_bImageMask) {
-    if (m_bDefaultDecode) {
-      set_argb = 0;
-      reset_argb = 0xFFFFFFFF;
-    }
-  } else if (m_pPalette && dest_Bpp != 1) {
-    reset_argb = m_pPalette.get()[0];
-    set_argb = m_pPalette.get()[1];
-  }
-  for (int i = 0; i < clip_width; i++) {
-    uint32_t src_x = (clip_left + i) * src_width / dest_width;
-    if (bFlipX)
-      src_x = src_width - src_x - 1;
-    src_x %= src_width;
-    int dest_pos = i * dest_Bpp;
-    uint32_t value_argb = GetBitValue(pSrcLine, src_x) ? set_argb : reset_argb;
-    if (dest_Bpp == 1) {
-      dest_scan[dest_pos] = static_cast<uint8_t>(value_argb);
-    } else if (dest_Bpp == 3) {
-      dest_scan[dest_pos] = FXARGB_B(value_argb);
-      dest_scan[dest_pos + 1] = FXARGB_G(value_argb);
-      dest_scan[dest_pos + 2] = FXARGB_R(value_argb);
-    } else {
-      *reinterpret_cast<uint32_t*>(dest_scan + dest_pos) = value_argb;
-    }
-  }
-}
-
-void CPDF_DIBSource::DownSampleScanline8Bit(int orig_Bpp,
-                                            int dest_Bpp,
-                                            uint32_t src_width,
-                                            const uint8_t* pSrcLine,
-                                            uint8_t* dest_scan,
-                                            int dest_width,
-                                            bool bFlipX,
-                                            int clip_left,
-                                            int clip_width) const {
-  if (m_bpc < 8) {
-    uint64_t src_bit_pos = 0;
-    for (uint32_t col = 0; col < src_width; col++) {
-      unsigned int color_index = 0;
-      for (uint32_t color = 0; color < m_nComponents; color++) {
-        unsigned int data = GetBits8(pSrcLine, src_bit_pos, m_bpc);
-        color_index |= data << (color * m_bpc);
-        src_bit_pos += m_bpc;
-      }
-      m_pLineBuf.get()[col] = color_index;
-    }
-    pSrcLine = m_pLineBuf.get();
-  }
-  if (m_bColorKey) {
-    for (int i = 0; i < clip_width; i++) {
-      uint32_t src_x = (clip_left + i) * src_width / dest_width;
-      if (bFlipX) {
-        src_x = src_width - src_x - 1;
-      }
-      src_x %= src_width;
-      uint8_t* pDestPixel = dest_scan + i * 4;
-      uint8_t index = pSrcLine[src_x];
-      if (m_pPalette) {
-        *pDestPixel++ = FXARGB_B(m_pPalette.get()[index]);
-        *pDestPixel++ = FXARGB_G(m_pPalette.get()[index]);
-        *pDestPixel++ = FXARGB_R(m_pPalette.get()[index]);
-      } else {
-        *pDestPixel++ = index;
-        *pDestPixel++ = index;
-        *pDestPixel++ = index;
-      }
-      *pDestPixel = (index < m_CompData[0].m_ColorKeyMin ||
-                     index > m_CompData[0].m_ColorKeyMax)
-                        ? 0xFF
-                        : 0;
-    }
-    return;
-  }
-  for (int i = 0; i < clip_width; i++) {
-    uint32_t src_x = (clip_left + i) * src_width / dest_width;
-    if (bFlipX)
-      src_x = src_width - src_x - 1;
-    src_x %= src_width;
-    uint8_t index = pSrcLine[src_x];
-    if (dest_Bpp == 1) {
-      dest_scan[i] = index;
-    } else {
-      int dest_pos = i * dest_Bpp;
-      FX_ARGB argb = m_pPalette.get()[index];
-      dest_scan[dest_pos] = FXARGB_B(argb);
-      dest_scan[dest_pos + 1] = FXARGB_G(argb);
-      dest_scan[dest_pos + 2] = FXARGB_R(argb);
-    }
-  }
-}
-
-void CPDF_DIBSource::DownSampleScanline32Bit(int orig_Bpp,
-                                             int dest_Bpp,
-                                             uint32_t src_width,
-                                             const uint8_t* pSrcLine,
-                                             uint8_t* dest_scan,
-                                             int dest_width,
-                                             bool bFlipX,
-                                             int clip_left,
-                                             int clip_width) const {
-  // last_src_x used to store the last seen src_x position which should be
-  // in [0, src_width). Set the initial value to be an invalid src_x value.
-  uint32_t last_src_x = src_width;
-  FX_ARGB last_argb = ArgbEncode(0xFF, 0xFF, 0xFF, 0xFF);
-  float unit_To8Bpc = 255.0f / ((1 << m_bpc) - 1);
-  for (int i = 0; i < clip_width; i++) {
-    int dest_x = clip_left + i;
-    uint32_t src_x = (bFlipX ? (dest_width - dest_x - 1) : dest_x) *
-                     (int64_t)src_width / dest_width;
-    src_x %= src_width;
-
-    uint8_t* pDestPixel = dest_scan + i * dest_Bpp;
-    FX_ARGB argb;
-    if (src_x == last_src_x) {
-      argb = last_argb;
-    } else {
-      CFX_FixedBufGrow<uint8_t, 16> extracted_components(m_nComponents);
-      const uint8_t* pSrcPixel = nullptr;
-      if (m_bpc % 8 != 0) {
-        // No need to check for 32-bit overflow, as |src_x| is bounded by
-        // |src_width| and DownSampleScanline() already checked for overflow
-        // with the pitch calculation.
-        size_t num_bits = src_x * m_bpc * m_nComponents;
-        uint64_t src_bit_pos = num_bits % 8;
-        pSrcPixel = pSrcLine + num_bits / 8;
-        for (uint32_t j = 0; j < m_nComponents; ++j) {
-          extracted_components[j] = static_cast<uint8_t>(
-              GetBits8(pSrcPixel, src_bit_pos, m_bpc) * unit_To8Bpc);
-          src_bit_pos += m_bpc;
-        }
-        pSrcPixel = extracted_components;
-      } else {
-        pSrcPixel = pSrcLine + src_x * orig_Bpp;
-        if (m_bpc == 16) {
-          for (uint32_t j = 0; j < m_nComponents; ++j)
-            extracted_components[j] = pSrcPixel[j * 2];
-          pSrcPixel = extracted_components;
-        }
-      }
-
-      if (m_pColorSpace) {
-        uint8_t color[4];
-        const bool bTransMask = TransMask();
-        if (!m_bDefaultDecode) {
-          for (uint32_t j = 0; j < m_nComponents; ++j) {
-            float component_value = static_cast<float>(pSrcPixel[j]);
-            int color_value = static_cast<int>(
-                (m_CompData[j].m_DecodeMin +
-                 m_CompData[j].m_DecodeStep * component_value) *
-                    255.0f +
-                0.5f);
-            extracted_components[j] = pdfium::clamp(color_value, 0, 255);
-          }
-        }
-        const uint8_t* pSrc =
-            m_bDefaultDecode ? pSrcPixel : extracted_components;
-        m_pColorSpace->TranslateImageLine(color, pSrc, 1, 0, 0, bTransMask);
-        argb = ArgbEncode(0xFF, color[2], color[1], color[0]);
-      } else {
-        argb = ArgbEncode(0xFF, pSrcPixel[2], pSrcPixel[1], pSrcPixel[0]);
-      }
-      if (m_bColorKey) {
-        int alpha = 0xFF;
-        if (m_nComponents == 3 && m_bpc == 8) {
-          alpha = (pSrcPixel[0] < m_CompData[0].m_ColorKeyMin ||
-                   pSrcPixel[0] > m_CompData[0].m_ColorKeyMax ||
-                   pSrcPixel[1] < m_CompData[1].m_ColorKeyMin ||
-                   pSrcPixel[1] > m_CompData[1].m_ColorKeyMax ||
-                   pSrcPixel[2] < m_CompData[2].m_ColorKeyMin ||
-                   pSrcPixel[2] > m_CompData[2].m_ColorKeyMax)
-                      ? 0xFF
-                      : 0;
-        }
-        argb &= 0xFFFFFF;
-        argb |= alpha << 24;
-      }
-      last_src_x = src_x;
-      last_argb = argb;
-    }
-    if (dest_Bpp == 4) {
-      *reinterpret_cast<uint32_t*>(pDestPixel) = FXARGB_TODIB(argb);
-    } else {
-      *pDestPixel++ = FXARGB_B(argb);
-      *pDestPixel++ = FXARGB_G(argb);
-      *pDestPixel = FXARGB_R(argb);
-    }
-  }
-}
-
-bool CPDF_DIBSource::TransMask() const {
-  return m_bLoadMask && m_GroupFamily == PDFCS_DEVICECMYK &&
-         m_Family == PDFCS_DEVICECMYK;
-}