Cleanup dead code in CPDF_DIBSource::LoadJpxBitmap() and friends.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1310603006 .

4 files changed, 92 insertions, 101 deletions

diff --git a/core/include/fxcodec/fx_codec.h b/core/include/fxcodec/fx_codec.h
index 39fd764ea9..48c1a3086f 100644
--- a/core/include/fxcodec/fx_codec.h
+++ b/core/include/fxcodec/fx_codec.h
@@ -13,6 +13,7 @@
 #include "fx_codec_provider.h"
 
 class CFX_DIBSource;
+class CJPX_Decoder;
 class ICodec_ScanlineDecoder;
 class ICodec_BasicModule;
 class ICodec_FaxModule;
@@ -196,28 +197,28 @@ class ICodec_JpegModule {
   virtual FX_DWORD GetAvailInput(void* pContext,
                                  uint8_t** avail_buf_ptr = NULL) = 0;
 };
+
 class ICodec_JpxModule {
  public:
   virtual ~ICodec_JpxModule() {}
 
-  virtual void* CreateDecoder(const uint8_t* src_buf,
-                              FX_DWORD src_size,
-                              FX_BOOL useColorSpace = FALSE) = 0;
+  virtual CJPX_Decoder* CreateDecoder(const uint8_t* src_buf,
+                                      FX_DWORD src_size,
+                                      bool use_colorspace) = 0;
 
-  virtual void GetImageInfo(void* ctx,
-                            FX_DWORD& width,
-                            FX_DWORD& height,
-                            FX_DWORD& codestream_nComps,
-                            FX_DWORD& output_nComps) = 0;
+  virtual void GetImageInfo(CJPX_Decoder* pDecoder,
+                            FX_DWORD* width,
+                            FX_DWORD* height,
+                            FX_DWORD* components) = 0;
 
-  virtual FX_BOOL Decode(void* ctx,
+  virtual FX_BOOL Decode(CJPX_Decoder* pDecoder,
                          uint8_t* dest_data,
                          int pitch,
-                         FX_BOOL bTranslateColor,
                          uint8_t* offsets) = 0;
 
-  virtual void DestroyDecoder(void* ctx) = 0;
+  virtual void DestroyDecoder(CJPX_Decoder* pDecoder) = 0;
 };
+
 class ICodec_Jbig2Module {
  public:
   virtual ~ICodec_Jbig2Module() {}
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
index 977abe1b7b..f75453557d 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
@@ -62,17 +62,17 @@ FX_SAFE_DWORD CalculatePitch32(int bpp, int width) {
 class JpxBitMapContext {
  public:
   explicit JpxBitMapContext(ICodec_JpxModule* jpx_module)
-      : jpx_module_(jpx_module), ctx_(nullptr), output_offsets_(nullptr) {}
+      : jpx_module_(jpx_module), decoder_(nullptr), output_offsets_(nullptr) {}
 
   ~JpxBitMapContext() {
     FX_Free(output_offsets_);
-    jpx_module_->DestroyDecoder(ctx_);
+    jpx_module_->DestroyDecoder(decoder_);
   }
 
-  // Takes ownership of |ctx|.
-  void set_context(void* ctx) { ctx_ = ctx; }
+  // Takes ownership of |decoder|.
+  void set_decoder(CJPX_Decoder* decoder) { decoder_ = decoder; }
 
-  void* context() { return ctx_; }
+  CJPX_Decoder* decoder() { return decoder_; }
 
   // Takes ownership of |output_offsets|.
   void set_output_offsets(unsigned char* output_offsets) {
@@ -83,7 +83,7 @@ class JpxBitMapContext {
 
  private:
   ICodec_JpxModule* jpx_module_;   // Weak pointer.
-  void* ctx_;                      // Decoder context, owned.
+  CJPX_Decoder* decoder_;          // Decoder, owned.
   unsigned char* output_offsets_;  // Output offsets for decoding, owned.
 
   // Disallow evil constructors
@@ -698,74 +698,64 @@ void CPDF_DIBSource::LoadJpxBitmap() {
 
   nonstd::unique_ptr<JpxBitMapContext> context(
       new JpxBitMapContext(pJpxModule));
-  context->set_context(pJpxModule->CreateDecoder(m_pStreamAcc->GetData(),
+  context->set_decoder(pJpxModule->CreateDecoder(m_pStreamAcc->GetData(),
                                                  m_pStreamAcc->GetSize(),
                                                  m_pColorSpace != nullptr));
-  if (!context->context())
+  if (!context->decoder())
     return;
 
   FX_DWORD width = 0;
   FX_DWORD height = 0;
-  FX_DWORD codestream_nComps = 0;
-  FX_DWORD image_nComps = 0;
-  pJpxModule->GetImageInfo(context->context(), width, height, codestream_nComps,
-                           image_nComps);
+  FX_DWORD components = 0;
+  pJpxModule->GetImageInfo(context->decoder(), &width, &height, &components);
   if ((int)width < m_Width || (int)height < m_Height)
     return;
 
-  int output_nComps;
-  FX_BOOL bTranslateColor;
   FX_BOOL bSwapRGB = FALSE;
   if (m_pColorSpace) {
-    if (codestream_nComps != (FX_DWORD)m_pColorSpace->CountComponents())
+    if (components != (FX_DWORD)m_pColorSpace->CountComponents())
       return;
-    output_nComps = codestream_nComps;
-    bTranslateColor = FALSE;
+
     if (m_pColorSpace == CPDF_ColorSpace::GetStockCS(PDFCS_DEVICERGB)) {
       bSwapRGB = TRUE;
       m_pColorSpace = nullptr;
     }
   } else {
-    bTranslateColor = TRUE;
-    if (image_nComps) {
-      output_nComps = image_nComps;
-    } else {
-      output_nComps = codestream_nComps;
-    }
-    if (output_nComps == 3) {
+    if (components == 3) {
       bSwapRGB = TRUE;
-    } else if (output_nComps == 4) {
+    } else if (components == 4) {
       m_pColorSpace = CPDF_ColorSpace::GetStockCS(PDFCS_DEVICECMYK);
-      bTranslateColor = FALSE;
     }
-    m_nComponents = output_nComps;
+    m_nComponents = components;
   }
+
   FXDIB_Format format;
-  if (output_nComps == 1) {
+  if (components == 1) {
     format = FXDIB_8bppRgb;
-  } else if (output_nComps <= 3) {
+  } else if (components <= 3) {
     format = FXDIB_Rgb;
-  } else if (output_nComps == 4) {
+  } else if (components == 4) {
     format = FXDIB_Rgb32;
   } else {
-    width = (width * output_nComps + 2) / 3;
+    width = (width * components + 2) / 3;
     format = FXDIB_Rgb;
   }
+
   m_pCachedBitmap.reset(new CFX_DIBitmap);
   if (!m_pCachedBitmap->Create(width, height, format)) {
     m_pCachedBitmap.reset();
     return;
   }
   m_pCachedBitmap->Clear(0xFFFFFFFF);
-  context->set_output_offsets(FX_Alloc(uint8_t, output_nComps));
-  for (int i = 0; i < output_nComps; ++i)
+  context->set_output_offsets(FX_Alloc(uint8_t, components));
+  for (int i = 0; i < components; ++i)
     context->output_offsets()[i] = i;
   if (bSwapRGB) {
     context->output_offsets()[0] = 2;
     context->output_offsets()[2] = 0;
   }
-  if (!pJpxModule->Decode(context->context(), m_pCachedBitmap->GetBuffer(),
-                          m_pCachedBitmap->GetPitch(), bTranslateColor,
+  if (!pJpxModule->Decode(context->decoder(), m_pCachedBitmap->GetBuffer(),
+                          m_pCachedBitmap->GetPitch(),
                           context->output_offsets())) {
     m_pCachedBitmap.reset();
     return;
diff --git a/core/src/fxcodec/codec/codec_int.h b/core/src/fxcodec/codec/codec_int.h
index 4bcdeed7ad..ebd34cac26 100644
--- a/core/src/fxcodec/codec/codec_int.h
+++ b/core/src/fxcodec/codec/codec_int.h
@@ -247,20 +247,21 @@ class CCodec_IccModule : public ICodec_IccModule {
 class CCodec_JpxModule : public ICodec_JpxModule {
  public:
   CCodec_JpxModule();
-  void* CreateDecoder(const uint8_t* src_buf,
-                      FX_DWORD src_size,
-                      FX_BOOL useColorSpace = FALSE);
-  void GetImageInfo(void* ctx,
-                    FX_DWORD& width,
-                    FX_DWORD& height,
-                    FX_DWORD& codestream_nComps,
-                    FX_DWORD& output_nComps);
-  FX_BOOL Decode(void* ctx,
+  ~CCodec_JpxModule() override;
+
+  // ICodec_JpxModule:
+  CJPX_Decoder* CreateDecoder(const uint8_t* src_buf,
+                              FX_DWORD src_size,
+                              bool use_colorspace) override;
+  void GetImageInfo(CJPX_Decoder* pDecoder,
+                    FX_DWORD* width,
+                    FX_DWORD* height,
+                    FX_DWORD* components) override;
+  FX_BOOL Decode(CJPX_Decoder* pDecoder,
                  uint8_t* dest_data,
                  int pitch,
-                 FX_BOOL bTranslateColor,
-                 uint8_t* offsets);
-  void DestroyDecoder(void* ctx);
+                 uint8_t* offsets) override;
+  void DestroyDecoder(CJPX_Decoder* pDecoder) override;
 };
 
 class CPDF_Jbig2Interface : public CJBig2_Module {
diff --git a/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp b/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
index e1b9d255de..81de30e58a 100644
--- a/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
+++ b/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp
@@ -613,26 +613,30 @@ void color_apply_conversion(opj_image_t* image) {
 }
 class CJPX_Decoder {
  public:
-  CJPX_Decoder();
+  explicit CJPX_Decoder(bool use_colorspace);
   ~CJPX_Decoder();
   FX_BOOL Init(const unsigned char* src_data, int src_size);
-  void GetInfo(FX_DWORD& width,
-               FX_DWORD& height,
-               FX_DWORD& codestream_nComps,
-               FX_DWORD& output_nComps);
+  void GetInfo(FX_DWORD* width, FX_DWORD* height, FX_DWORD* components);
   FX_BOOL Decode(uint8_t* dest_buf,
                  int pitch,
-                 FX_BOOL bTranslateColor,
                  uint8_t* offsets);
+
+ private:
   const uint8_t* m_SrcData;
   int m_SrcSize;
   opj_image_t* image;
   opj_codec_t* l_codec;
   opj_stream_t* l_stream;
-  FX_BOOL m_useColorSpace;
+  bool m_UseColorSpace;
 };
-CJPX_Decoder::CJPX_Decoder()
-    : image(NULL), l_codec(NULL), l_stream(NULL), m_useColorSpace(FALSE) {}
+
+CJPX_Decoder::CJPX_Decoder(bool use_colorspace)
+    : image(nullptr),
+      l_codec(nullptr),
+      l_stream(nullptr),
+      m_UseColorSpace(use_colorspace) {
+}
+
 CJPX_Decoder::~CJPX_Decoder() {
   if (l_codec) {
     opj_destroy_codec(l_codec);
@@ -644,6 +648,7 @@ CJPX_Decoder::~CJPX_Decoder() {
     opj_image_destroy(image);
   }
 }
+
 FX_BOOL CJPX_Decoder::Init(const unsigned char* src_data, int src_size) {
   static const unsigned char szJP2Header[] = {
       0x00, 0x00, 0x00, 0x0c, 0x6a, 0x50, 0x20, 0x20, 0x0d, 0x0a, 0x87, 0x0a};
@@ -722,17 +727,17 @@ FX_BOOL CJPX_Decoder::Init(const unsigned char* src_data, int src_size) {
   }
   return TRUE;
 }
-void CJPX_Decoder::GetInfo(FX_DWORD& width,
-                           FX_DWORD& height,
-                           FX_DWORD& codestream_nComps,
-                           FX_DWORD& output_nComps) {
-  width = (FX_DWORD)image->x1;
-  height = (FX_DWORD)image->y1;
-  output_nComps = codestream_nComps = (FX_DWORD)image->numcomps;
+
+void CJPX_Decoder::GetInfo(FX_DWORD* width,
+                           FX_DWORD* height,
+                           FX_DWORD* components) {
+  *width = (FX_DWORD)image->x1;
+  *height = (FX_DWORD)image->y1;
+  *components = (FX_DWORD)image->numcomps;
 }
+
 FX_BOOL CJPX_Decoder::Decode(uint8_t* dest_buf,
                              int pitch,
-                             FX_BOOL bTranslateColor,
                              uint8_t* offsets) {
   int i, wid, hei, row, col, channel, src;
   uint8_t* pChannel;
@@ -815,38 +820,32 @@ done:
   FX_Free(adjust_comps);
   return result;
 }
-void initialize_transition_table();
-void initialize_significance_luts();
-void initialize_sign_lut();
+
 CCodec_JpxModule::CCodec_JpxModule() {}
-void* CCodec_JpxModule::CreateDecoder(const uint8_t* src_buf,
-                                      FX_DWORD src_size,
-                                      FX_BOOL useColorSpace) {
-  CJPX_Decoder* pDecoder = new CJPX_Decoder;
-  pDecoder->m_useColorSpace = useColorSpace;
-  if (!pDecoder->Init(src_buf, src_size)) {
-    delete pDecoder;
-    return NULL;
-  }
-  return pDecoder;
+CCodec_JpxModule::~CCodec_JpxModule() {
 }
-void CCodec_JpxModule::GetImageInfo(void* ctx,
-                                    FX_DWORD& width,
-                                    FX_DWORD& height,
-                                    FX_DWORD& codestream_nComps,
-                                    FX_DWORD& output_nComps) {
-  CJPX_Decoder* pDecoder = (CJPX_Decoder*)ctx;
-  pDecoder->GetInfo(width, height, codestream_nComps, output_nComps);
+
+CJPX_Decoder* CCodec_JpxModule::CreateDecoder(const uint8_t* src_buf,
+                                              FX_DWORD src_size,
+                                              bool use_colorspace) {
+  nonstd::unique_ptr<CJPX_Decoder> decoder(new CJPX_Decoder(use_colorspace));
+  return decoder->Init(src_buf, src_size) ? decoder.release() : nullptr;
 }
-FX_BOOL CCodec_JpxModule::Decode(void* ctx,
+
+void CCodec_JpxModule::GetImageInfo(CJPX_Decoder* pDecoder,
+                                    FX_DWORD* width,
+                                    FX_DWORD* height,
+                                    FX_DWORD* components) {
+  pDecoder->GetInfo(width, height, components);
+}
+
+FX_BOOL CCodec_JpxModule::Decode(CJPX_Decoder* pDecoder,
                                  uint8_t* dest_data,
                                  int pitch,
-                                 FX_BOOL bTranslateColor,
                                  uint8_t* offsets) {
-  CJPX_Decoder* pDecoder = (CJPX_Decoder*)ctx;
-  return pDecoder->Decode(dest_data, pitch, bTranslateColor, offsets);
+  return pDecoder->Decode(dest_data, pitch, offsets);
 }
-void CCodec_JpxModule::DestroyDecoder(void* ctx) {
-  CJPX_Decoder* pDecoder = (CJPX_Decoder*)ctx;
+
+void CCodec_JpxModule::DestroyDecoder(CJPX_Decoder* pDecoder) {
   delete pDecoder;
 }