Add CPDF_DIBSource::LoadState enum class.

Change-Id: I97819912e564e4b52fcdae4ce7f865188fb1a520
Reviewed-on: https://pdfium-review.googlesource.com/27850
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

2 files changed, 27 insertions, 48 deletions

diff --git a/core/fpdfapi/render/cpdf_dibsource.cpp b/core/fpdfapi/render/cpdf_dibsource.cpp
index 48715d2ecb..1a35826232 100644
--- a/core/fpdfapi/render/cpdf_dibsource.cpp
+++ b/core/fpdfapi/render/cpdf_dibsource.cpp
@@ -108,30 +108,7 @@ const int kMaxImageDimension = 0x01FFFF;
 
 }  // namespace
 
-CPDF_DIBSource::CPDF_DIBSource()
-    : m_pDocument(nullptr),
-      m_pStream(nullptr),
-      m_pDict(nullptr),
-      m_pColorSpace(nullptr),
-      m_Family(0),
-      m_bpc(0),
-      m_bpc_orig(0),
-      m_nComponents(0),
-      m_GroupFamily(0),
-      m_MatteColor(0),
-      m_bLoadMask(false),
-      m_bDefaultDecode(true),
-      m_bImageMask(false),
-      m_bDoBpcCheck(true),
-      m_bColorKey(false),
-      m_bHasMask(false),
-      m_bStdCS(false),
-      m_pCompData(nullptr),
-      m_pLineBuf(nullptr),
-      m_pMaskedLine(nullptr),
-      m_pMask(nullptr),
-      m_pMaskStream(nullptr),
-      m_Status(0) {}
+CPDF_DIBSource::CPDF_DIBSource() {}
 
 CPDF_DIBSource::~CPDF_DIBSource() {
   FX_Free(m_pMaskedLine);
@@ -310,10 +287,10 @@ int CPDF_DIBSource::StartLoadDIBSource(CPDF_Document* pDoc,
 }
 
 int CPDF_DIBSource::ContinueLoadDIBSource(IFX_PauseIndicator* pPause) {
-  if (m_Status == 2)
+  if (m_Status == LoadState::kContinue)
     return ContinueLoadMaskDIB(pPause);
 
-  if (m_Status != 1)
+  if (m_Status == LoadState::kFail)
     return 0;
 
   const ByteString& decoder = m_pStreamAcc->GetImageDecoder();
@@ -352,7 +329,7 @@ int CPDF_DIBSource::ContinueLoadDIBSource(IFX_PauseIndicator* pPause) {
   int iContinueStatus = 1;
   if (m_bHasMask) {
     iContinueStatus = ContinueLoadMaskDIB(pPause);
-    m_Status = 2;
+    m_Status = LoadState::kContinue;
   }
   if (iContinueStatus == 2)
     return 2;
@@ -493,7 +470,7 @@ int CPDF_DIBSource::CreateDecoder() {
       m_pCachedBitmap.Reset();
       return 0;
     }
-    m_Status = 1;
+    m_Status = LoadState::kSuccess;
     return 2;
   }
 
@@ -731,8 +708,8 @@ int CPDF_DIBSource::StartLoadMaskDIB() {
   int ret = m_pMask->StartLoadDIBSource(m_pDocument.Get(), m_pMaskStream.Get(),
                                         false, nullptr, nullptr, true);
   if (ret == 2) {
-    if (m_Status == 0)
-      m_Status = 2;
+    if (m_Status == LoadState::kFail)
+      m_Status = LoadState::kContinue;
     return 2;
   }
   if (!ret) {
diff --git a/core/fpdfapi/render/cpdf_dibsource.h b/core/fpdfapi/render/cpdf_dibsource.h
index bb4fdbad90..dce5a535c4 100644
--- a/core/fpdfapi/render/cpdf_dibsource.h
+++ b/core/fpdfapi/render/cpdf_dibsource.h
@@ -44,6 +44,8 @@ class CPDF_DIBSource : public CFX_DIBSource {
   template <typename T, typename... Args>
   friend RetainPtr<T> pdfium::MakeRetain(Args&&... args);
 
+  enum class LoadState : uint8_t { kFail, kSuccess, kContinue };
+
   ~CPDF_DIBSource() override;
 
   bool Load(CPDF_Document* pDoc, const CPDF_Stream* pStream);
@@ -126,30 +128,30 @@ class CPDF_DIBSource : public CFX_DIBSource {
   UnownedPtr<const CPDF_Stream> m_pStream;
   UnownedPtr<const CPDF_Dictionary> m_pDict;
   RetainPtr<CPDF_StreamAcc> m_pStreamAcc;
-  CPDF_ColorSpace* m_pColorSpace;
-  uint32_t m_Family;
-  uint32_t m_bpc;
-  uint32_t m_bpc_orig;
-  uint32_t m_nComponents;
-  uint32_t m_GroupFamily;
-  uint32_t m_MatteColor;
-  bool m_bLoadMask;
-  bool m_bDefaultDecode;
-  bool m_bImageMask;
-  bool m_bDoBpcCheck;
-  bool m_bColorKey;
-  bool m_bHasMask;
-  bool m_bStdCS;
-  DIB_COMP_DATA* m_pCompData;
-  uint8_t* m_pLineBuf;
-  uint8_t* m_pMaskedLine;
+  CPDF_ColorSpace* m_pColorSpace = nullptr;
+  uint32_t m_Family = 0;
+  uint32_t m_bpc = 0;
+  uint32_t m_bpc_orig = 0;
+  uint32_t m_nComponents = 0;
+  uint32_t m_GroupFamily = 0;
+  uint32_t m_MatteColor = 0;
+  bool m_bLoadMask = false;
+  bool m_bDefaultDecode = true;
+  bool m_bImageMask = false;
+  bool m_bDoBpcCheck = true;
+  bool m_bColorKey = false;
+  bool m_bHasMask = false;
+  bool m_bStdCS = false;
+  DIB_COMP_DATA* m_pCompData = nullptr;
+  uint8_t* m_pLineBuf = nullptr;
+  uint8_t* m_pMaskedLine = nullptr;
   RetainPtr<CFX_DIBitmap> m_pCachedBitmap;
   RetainPtr<CPDF_DIBSource> m_pMask;
   RetainPtr<CPDF_StreamAcc> m_pGlobalStream;
   std::unique_ptr<CCodec_ScanlineDecoder> m_pDecoder;
   std::unique_ptr<CCodec_Jbig2Context> m_pJbig2Context;
   UnownedPtr<CPDF_Stream> m_pMaskStream;
-  int m_Status;
+  LoadState m_Status = LoadState::kFail;
 };
 
 #endif  // CORE_FPDFAPI_RENDER_CPDF_DIBSOURCE_H_