Cleanup CPDF_RenderOptions colour members.

This CL removes the fore/back colours in favour of just using the
colours inline and converts the m_ColorMode to an enum.

Change-Id: I1796e200d5c470680126af8625d45fc3062a1042
Reviewed-on: https://pdfium-review.googlesource.com/7751
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Nicolás Peña <npm@chromium.org>
Commit-Queue: dsinclair <dsinclair@chromium.org>

4 files changed, 20 insertions, 47 deletions

diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
index 6fcf89c83a..e6280772c8 100644
--- a/core/fpdfapi/render/cpdf_imagerenderer.cpp
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -76,7 +76,7 @@ bool CPDF_ImageRenderer::StartRenderDIBSource() {
   CPDF_GeneralState& state = m_pImageObject->m_GeneralState;
   m_BitmapAlpha = FXSYS_round(255 * state.GetFillAlpha());
   m_pDIBSource = m_Loader.m_pBitmap;
-  if (m_pRenderStatus->m_Options.m_ColorMode == RENDER_COLOR_ALPHA &&
+  if (m_pRenderStatus->m_Options.m_ColorMode == CPDF_RenderOptions::kAlpha &&
       !m_Loader.m_pMask) {
     return StartBitmapAlpha();
   }
@@ -103,10 +103,10 @@ bool CPDF_ImageRenderer::StartRenderDIBSource() {
         m_bPatternColor = true;
     }
     m_FillArgb = m_pRenderStatus->GetFillArgb(m_pImageObject.Get());
-  } else if (m_pRenderStatus->m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
+  } else if (m_pRenderStatus->m_Options.m_ColorMode ==
+             CPDF_RenderOptions::kGray) {
     m_pClone = m_pDIBSource->Clone(nullptr);
-    m_pClone->ConvertColorScale(m_pRenderStatus->m_Options.m_BackColor,
-                                m_pRenderStatus->m_Options.m_ForeColor);
+    m_pClone->ConvertColorScale(0xffffff, 0);
     m_pDIBSource = m_pClone;
   }
   m_Flags = 0;
diff --git a/core/fpdfapi/render/cpdf_renderoptions.cpp b/core/fpdfapi/render/cpdf_renderoptions.cpp
index b452405c3d..7916243cba 100644
--- a/core/fpdfapi/render/cpdf_renderoptions.cpp
+++ b/core/fpdfapi/render/cpdf_renderoptions.cpp
@@ -7,15 +7,13 @@
 #include "core/fpdfapi/render/cpdf_renderoptions.h"
 
 CPDF_RenderOptions::CPDF_RenderOptions()
-    : m_ColorMode(RENDER_COLOR_NORMAL),
+    : m_ColorMode(kNormal),
       m_Flags(RENDER_CLEARTYPE),
       m_dwLimitCacheSize(1024 * 1024 * 100),
       m_bDrawAnnots(false) {}
 
 CPDF_RenderOptions::CPDF_RenderOptions(const CPDF_RenderOptions& rhs)
     : m_ColorMode(rhs.m_ColorMode),
-      m_BackColor(rhs.m_BackColor),
-      m_ForeColor(rhs.m_ForeColor),
       m_Flags(rhs.m_Flags),
       m_dwLimitCacheSize(rhs.m_dwLimitCacheSize),
       m_bDrawAnnots(rhs.m_bDrawAnnots),
@@ -24,10 +22,9 @@ CPDF_RenderOptions::CPDF_RenderOptions(const CPDF_RenderOptions& rhs)
 CPDF_RenderOptions::~CPDF_RenderOptions() {}
 
 FX_ARGB CPDF_RenderOptions::TranslateColor(FX_ARGB argb) const {
-  if (m_ColorMode == RENDER_COLOR_NORMAL)
+  if (m_ColorMode == kNormal)
     return argb;
-
-  if (m_ColorMode == RENDER_COLOR_ALPHA)
+  if (m_ColorMode == kAlpha)
     return argb;
 
   int a;
@@ -36,25 +33,5 @@ FX_ARGB CPDF_RenderOptions::TranslateColor(FX_ARGB argb) const {
   int b;
   std::tie(a, r, g, b) = ArgbDecode(argb);
   int gray = FXRGB2GRAY(r, g, b);
-  if (m_ColorMode == RENDER_COLOR_TWOCOLOR) {
-    int color = (r - gray) * (r - gray) + (g - gray) * (g - gray) +
-                (b - gray) * (b - gray);
-    if (gray < 35 && color < 20)
-      return ArgbEncode(a, m_ForeColor);
-
-    if (gray > 221 && color < 20)
-      return ArgbEncode(a, m_BackColor);
-
-    return argb;
-  }
-  int fr = FXSYS_GetRValue(m_ForeColor);
-  int fg = FXSYS_GetGValue(m_ForeColor);
-  int fb = FXSYS_GetBValue(m_ForeColor);
-  int br = FXSYS_GetRValue(m_BackColor);
-  int bg = FXSYS_GetGValue(m_BackColor);
-  int bb = FXSYS_GetBValue(m_BackColor);
-  r = (br - fr) * gray / 255 + fr;
-  g = (bg - fg) * gray / 255 + fg;
-  b = (bb - fb) * gray / 255 + fb;
-  return ArgbEncode(a, r, g, b);
+  return ArgbEncode(a, gray, gray, gray);
 }
diff --git a/core/fpdfapi/render/cpdf_renderoptions.h b/core/fpdfapi/render/cpdf_renderoptions.h
index bdcae55ad3..aa48b4e5dc 100644
--- a/core/fpdfapi/render/cpdf_renderoptions.h
+++ b/core/fpdfapi/render/cpdf_renderoptions.h
@@ -12,10 +12,6 @@
 #include "core/fxcrt/fx_system.h"
 #include "core/fxge/fx_dib.h"
 
-#define RENDER_COLOR_NORMAL 0
-#define RENDER_COLOR_GRAY 1
-#define RENDER_COLOR_TWOCOLOR 2
-#define RENDER_COLOR_ALPHA 3
 #define RENDER_CLEARTYPE 0x00000001
 #define RENDER_PRINTGRAPHICTEXT 0x00000002
 #define RENDER_FORCE_DOWNSAMPLE 0x00000004
@@ -36,15 +32,15 @@
 
 class CPDF_RenderOptions {
  public:
+  enum Type { kNormal = 0, kGray, kAlpha };
+
   CPDF_RenderOptions();
   CPDF_RenderOptions(const CPDF_RenderOptions& rhs);
   ~CPDF_RenderOptions();
 
   FX_ARGB TranslateColor(FX_ARGB argb) const;
 
-  int m_ColorMode;
-  FX_COLORREF m_BackColor;
-  FX_COLORREF m_ForeColor;
+  Type m_ColorMode;
   uint32_t m_Flags;
   uint32_t m_dwLimitCacheSize;
   bool m_bDrawAnnots;
diff --git a/core/fpdfapi/render/cpdf_renderstatus.cpp b/core/fpdfapi/render/cpdf_renderstatus.cpp
index a3b1bb8567..ccbe39ea07 100644
--- a/core/fpdfapi/render/cpdf_renderstatus.cpp
+++ b/core/fpdfapi/render/cpdf_renderstatus.cpp
@@ -937,7 +937,7 @@ CFX_RetainPtr<CFX_DIBitmap> DrawPatternBitmap(CPDF_Document* pDoc,
   mtPattern2Bitmap.Concat(mtAdjust);
   CPDF_RenderOptions options;
   if (!pPattern->colored())
-    options.m_ColorMode = RENDER_COLOR_ALPHA;
+    options.m_ColorMode = CPDF_RenderOptions::kAlpha;
 
   flags |= RENDER_FORCE_HALFTONE;
   options.m_Flags = flags;
@@ -2138,8 +2138,8 @@ void CPDF_RenderStatus::DrawShading(CPDF_ShadingPattern* pPattern,
   if (bAlphaMode)
     pBitmap->LoadChannel(FXDIB_Red, pBitmap, FXDIB_Alpha);
 
-  if (m_Options.m_ColorMode == RENDER_COLOR_GRAY)
-    pBitmap->ConvertColorScale(m_Options.m_ForeColor, m_Options.m_BackColor);
+  if (m_Options.m_ColorMode == CPDF_RenderOptions::kGray)
+    pBitmap->ConvertColorScale(0, 0xffffff);
   buffer.OutputToDevice();
 }
 
@@ -2170,7 +2170,7 @@ void CPDF_RenderStatus::DrawShadingPattern(CPDF_ShadingPattern* pattern,
       FXSYS_round(255 * (bStroke ? pPageObj->m_GeneralState.GetStrokeAlpha()
                                  : pPageObj->m_GeneralState.GetFillAlpha()));
   DrawShading(pattern, &matrix, rect, alpha,
-              m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
+              m_Options.m_ColorMode == CPDF_RenderOptions::kAlpha);
 }
 
 void CPDF_RenderStatus::ProcessShading(const CPDF_ShadingObject* pShadingObj,
@@ -2185,7 +2185,7 @@ void CPDF_RenderStatus::ProcessShading(const CPDF_ShadingObject* pShadingObj,
   matrix.Concat(*pObj2Device);
   DrawShading(pShadingObj->m_pShading.Get(), &matrix, rect,
               FXSYS_round(255 * pShadingObj->m_GeneralState.GetFillAlpha()),
-              m_Options.m_ColorMode == RENDER_COLOR_ALPHA);
+              m_Options.m_ColorMode == CPDF_RenderOptions::kAlpha);
 }
 
 void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
@@ -2310,9 +2310,8 @@ void CPDF_RenderStatus::DrawTilingPattern(CPDF_TilingPattern* pPattern,
   if (!pPatternBitmap)
     return;
 
-  if (m_Options.m_ColorMode == RENDER_COLOR_GRAY) {
-    pPatternBitmap->ConvertColorScale(m_Options.m_ForeColor,
-                                      m_Options.m_BackColor);
+  if (m_Options.m_ColorMode == CPDF_RenderOptions::kGray) {
+    pPatternBitmap->ConvertColorScale(0, 0xffffff);
   }
   FX_ARGB fill_argb = GetFillArgb(pPageObj);
   int clip_width = clip_box.right - clip_box.left;
@@ -2616,7 +2615,8 @@ CFX_RetainPtr<CFX_DIBitmap> CPDF_RenderStatus::LoadSMask(
     pFormResource = form.m_pFormDict->GetDictFor("Resources");
   }
   CPDF_RenderOptions options;
-  options.m_ColorMode = bLuminosity ? RENDER_COLOR_NORMAL : RENDER_COLOR_ALPHA;
+  options.m_ColorMode =
+      bLuminosity ? CPDF_RenderOptions::kNormal : CPDF_RenderOptions::kAlpha;
   CPDF_RenderStatus status;
   status.Initialize(m_pContext.Get(), &bitmap_device, nullptr, nullptr, nullptr,
                     nullptr, &options, 0, m_bDropObjects, pFormResource, true,