Use std::span<> in CCodec_JPEGModule

Also rename .cpp file to match class name and .h file.
Modify some helper functions to operate on spans.
Move some initializations to member declarations.

Change-Id: Ie0889bda91daaef80fae6f5681f8ce068e92453b
Reviewed-on: https://pdfium-review.googlesource.com/41534
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

2 files changed, 10 insertions, 11 deletions

diff --git a/core/fpdfapi/render/cpdf_dibbase.cpp b/core/fpdfapi/render/cpdf_dibbase.cpp
index a1fae05bda..dd710f6e75 100644
--- a/core/fpdfapi/render/cpdf_dibbase.cpp
+++ b/core/fpdfapi/render/cpdf_dibbase.cpp
@@ -484,7 +484,7 @@ CPDF_DIBBase::LoadState CPDF_DIBBase::CreateDecoder() {
     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))
+    if (!CreateDCTDecoder({src_data, src_size}, pParams))
       return LoadState::kFail;
   }
   if (!m_pDecoder)
@@ -503,12 +503,11 @@ CPDF_DIBBase::LoadState CPDF_DIBBase::CreateDecoder() {
   return LoadState::kSuccess;
 }
 
-bool CPDF_DIBBase::CreateDCTDecoder(const uint8_t* src_data,
-                                    uint32_t src_size,
+bool CPDF_DIBBase::CreateDCTDecoder(pdfium::span<const uint8_t> src_span,
                                     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,
+      src_span, m_Width, m_Height, m_nComponents,
       !pParams || pParams->GetIntegerFor("ColorTransform", 1));
   if (m_pDecoder)
     return true;
@@ -516,15 +515,15 @@ bool CPDF_DIBBase::CreateDCTDecoder(const uint8_t* src_data,
   bool bTransform = false;
   int comps;
   int bpc;
-  if (!pJpegModule->LoadInfo(src_data, src_size, &m_Width, &m_Height, &comps,
-                             &bpc, &bTransform)) {
+  if (!pJpegModule->LoadInfo(src_span, &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);
+    m_pDecoder = pJpegModule->CreateDecoder(src_span, m_Width, m_Height,
+                                            m_nComponents, bTransform);
     return true;
   }
 
@@ -569,7 +568,7 @@ bool CPDF_DIBBase::CreateDCTDecoder(const uint8_t* src_data,
     return false;
 
   m_bpc = bpc;
-  m_pDecoder = pJpegModule->CreateDecoder(src_data, src_size, m_Width, m_Height,
+  m_pDecoder = pJpegModule->CreateDecoder(src_span, m_Width, m_Height,
                                           m_nComponents, bTransform);
   return true;
 }
diff --git a/core/fpdfapi/render/cpdf_dibbase.h b/core/fpdfapi/render/cpdf_dibbase.h
index 423069db25..be48c3182d 100644
--- a/core/fpdfapi/render/cpdf_dibbase.h
+++ b/core/fpdfapi/render/cpdf_dibbase.h
@@ -22,6 +22,7 @@
 #include "core/fxcrt/unowned_ptr.h"
 #include "core/fxge/cfx_defaultrenderdevice.h"
 #include "core/fxge/dib/cfx_dibbase.h"
+#include "third_party/base/span.h"
 
 class CCodec_Jbig2Context;
 class CCodec_ScanlineDecoder;
@@ -90,8 +91,7 @@ class CPDF_DIBBase final : public CFX_DIBBase {
   RetainPtr<CFX_DIBitmap> LoadJpxBitmap();
   void LoadPalette();
   LoadState CreateDecoder();
-  bool CreateDCTDecoder(const uint8_t* src_data,
-                        uint32_t src_size,
+  bool CreateDCTDecoder(pdfium::span<const uint8_t> src_data,
                         const CPDF_Dictionary* pParams);
   void TranslateScanline24bpp(uint8_t* dest_scan,
                               const uint8_t* src_scan) const;