Remove gamma code

The gamma value is always 2.2, which means the table entries all point
to themselves. Remove the usage of the gamma table.

Change-Id: Idbb06015e8acd9f106f4bd1da5ef06563fb26296
Reviewed-on: https://pdfium-review.googlesource.com/5352
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

3 files changed, 0 insertions, 27 deletions

diff --git a/core/fxge/cfx_gemodule.h b/core/fxge/cfx_gemodule.h
index e51ddde967..429f7d9a39 100644
--- a/core/fxge/cfx_gemodule.h
+++ b/core/fxge/cfx_gemodule.h
@@ -24,8 +24,6 @@ class CFX_GEModule {
   void Init(const char** pUserFontPaths);
   CFX_FontCache* GetFontCache();
   CFX_FontMgr* GetFontMgr() { return m_pFontMgr.get(); }
-  void SetTextGamma(float gammaValue);
-  const uint8_t* GetTextGammaTable() const;
 
   CCodec_ModuleMgr* GetCodecModule() { return m_pCodecModule.get(); }
   void* GetPlatformData() { return m_pPlatformData; }
@@ -37,7 +35,6 @@ class CFX_GEModule {
   void InitPlatform();
   void DestroyPlatform();
 
-  uint8_t m_GammaValue[256];
   std::unique_ptr<CFX_FontCache> m_pFontCache;
   std::unique_ptr<CFX_FontMgr> m_pFontMgr;
   std::unique_ptr<CCodec_ModuleMgr> m_pCodecModule;
diff --git a/core/fxge/ge/cfx_facecache.cpp b/core/fxge/ge/cfx_facecache.cpp
index 5ad7bdd99a..6d5e3d4355 100644
--- a/core/fxge/ge/cfx_facecache.cpp
+++ b/core/fxge/ge/cfx_facecache.cpp
@@ -35,15 +35,6 @@ namespace {
 
 constexpr uint32_t kInvalidGlyphIndex = static_cast<uint32_t>(-1);
 
-void GammaAdjust(uint8_t* pData,
-                 int nHeight,
-                 int src_pitch,
-                 const uint8_t* gammaTable) {
-  int count = nHeight * src_pitch;
-  for (int i = 0; i < count; i++)
-    pData[i] = gammaTable[pData[i]];
-}
-
 void ContrastAdjust(uint8_t* pDataIn,
                     uint8_t* pDataOut,
                     int nWidth,
@@ -227,8 +218,6 @@ std::unique_ptr<CFX_GlyphBitmap> CFX_FaceCache::RenderGlyph(
     } else {
       ContrastAdjust(pSrcBuf, pDestBuf, bmwidth, bmheight, src_pitch,
                      dest_pitch);
-      GammaAdjust(pDestBuf, bmheight, dest_pitch,
-                  CFX_GEModule::Get()->GetTextGammaTable());
     }
   }
   return pGlyphBitmap;
diff --git a/core/fxge/ge/cfx_gemodule.cpp b/core/fxge/ge/cfx_gemodule.cpp
index 2cd1e31144..d7ae098f31 100644
--- a/core/fxge/ge/cfx_gemodule.cpp
+++ b/core/fxge/ge/cfx_gemodule.cpp
@@ -47,7 +47,6 @@ void CFX_GEModule::Init(const char** userFontPaths) {
   ASSERT(g_pGEModule);
   m_pUserFontPaths = userFontPaths;
   InitPlatform();
-  SetTextGamma(2.2f);
 }
 
 CFX_FontCache* CFX_GEModule::GetFontCache() {
@@ -55,15 +54,3 @@ CFX_FontCache* CFX_GEModule::GetFontCache() {
     m_pFontCache = pdfium::MakeUnique<CFX_FontCache>();
   return m_pFontCache.get();
 }
-
-void CFX_GEModule::SetTextGamma(float gammaValue) {
-  gammaValue /= 2.2f;
-  for (int i = 0; i < 256; ++i) {
-    m_GammaValue[i] = static_cast<uint8_t>(
-        FXSYS_pow(static_cast<float>(i) / 255, gammaValue) * 255.0f + 0.5f);
-  }
-}
-
-const uint8_t* CFX_GEModule::GetTextGammaTable() const {
-  return m_GammaValue;
-}