Clean up CFX_RenderDevice::DrawNormalText().

Review-Url: https://codereview.chromium.org/1990583002

5 files changed, 438 insertions, 895 deletions

diff --git a/core/fpdfapi/fpdf_render/fpdf_render_text.cpp b/core/fpdfapi/fpdf_render/fpdf_render_text.cpp
index 225b6726e2..221d04fd70 100644
--- a/core/fpdfapi/fpdf_render/fpdf_render_text.cpp
+++ b/core/fpdfapi/fpdf_render/fpdf_render_text.cpp
@@ -348,13 +348,15 @@ class CPDF_RefType3Cache {
   uint32_t m_dwCount;
   CPDF_Type3Font* m_pType3Font;
 };
+
 FX_BOOL CPDF_RenderStatus::ProcessType3Text(const CPDF_TextObject* textobj,
                                             const CFX_Matrix* pObj2Device) {
   CPDF_Type3Font* pType3Font = textobj->m_TextState.GetFont()->AsType3Font();
-  for (int j = 0; j < m_Type3FontCache.GetSize(); j++) {
-    if (m_Type3FontCache.GetAt(j) == pType3Font)
+  for (int i = 0; i < m_Type3FontCache.GetSize(); ++i) {
+    if (m_Type3FontCache.GetAt(i) == pType3Font)
       return TRUE;
   }
+
   CFX_Matrix dCTM = m_pDevice->GetCTM();
   FX_FLOAT sa = FXSYS_fabs(dCTM.a);
   FX_FLOAT sd = FXSYS_fabs(dCTM.d);
@@ -366,44 +368,43 @@ FX_BOOL CPDF_RenderStatus::ProcessType3Text(const CPDF_TextObject* textobj,
   FX_ARGB fill_argb = GetFillArgb(textobj, TRUE);
   int fill_alpha = FXARGB_A(fill_argb);
   int device_class = m_pDevice->GetDeviceClass();
-  FXTEXT_GLYPHPOS* pGlyphAndPos = NULL;
-  if (device_class == FXDC_DISPLAY) {
-    pGlyphAndPos = FX_Alloc(FXTEXT_GLYPHPOS, textobj->m_nChars);
-  } else if (fill_alpha < 255) {
+  std::vector<FXTEXT_GLYPHPOS> glyphs;
+  if (device_class == FXDC_DISPLAY)
+    glyphs.resize(textobj->m_nChars);
+  else if (fill_alpha < 255)
     return FALSE;
-  }
+
   CPDF_RefType3Cache refTypeCache(pType3Font);
   uint32_t* pChars = textobj->m_pCharCodes;
-  if (textobj->m_nChars == 1) {
+  if (textobj->m_nChars == 1)
     pChars = (uint32_t*)(&textobj->m_pCharCodes);
-  }
+
   for (int iChar = 0; iChar < textobj->m_nChars; iChar++) {
     uint32_t charcode = pChars[iChar];
-    if (charcode == (uint32_t)-1) {
+    if (charcode == (uint32_t)-1)
       continue;
-    }
+
     CPDF_Type3Char* pType3Char = pType3Font->LoadChar(charcode);
-    if (!pType3Char) {
+    if (!pType3Char)
       continue;
-    }
+
     CFX_Matrix matrix = char_matrix;
     matrix.e += iChar ? textobj->m_pCharPos[iChar - 1] : 0;
     matrix.Concat(text_matrix);
     matrix.Concat(*pObj2Device);
     if (!pType3Char->LoadBitmap(m_pContext)) {
-      if (pGlyphAndPos) {
+      if (!glyphs.empty()) {
         for (int i = 0; i < iChar; i++) {
-          FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[i];
-          if (!glyph.m_pGlyph) {
+          const FXTEXT_GLYPHPOS& glyph = glyphs[i];
+          if (!glyph.m_pGlyph)
             continue;
-          }
+
           m_pDevice->SetBitMask(&glyph.m_pGlyph->m_Bitmap,
                                 glyph.m_OriginX + glyph.m_pGlyph->m_Left,
                                 glyph.m_OriginY - glyph.m_pGlyph->m_Top,
                                 fill_argb);
         }
-        FX_Free(pGlyphAndPos);
-        pGlyphAndPos = NULL;
+        glyphs.clear();
       }
       CPDF_GraphicStates* pStates = CloneObjStates(textobj, FALSE);
       CPDF_RenderOptions Options = m_Options;
@@ -453,18 +454,18 @@ FX_BOOL CPDF_RenderStatus::ProcessType3Text(const CPDF_TextObject* textobj,
         CPDF_Type3Cache* pCache = GetCachedType3(pType3Font);
         refTypeCache.m_dwCount++;
         CFX_GlyphBitmap* pBitmap = pCache->LoadGlyph(charcode, &matrix, sa, sd);
-        if (!pBitmap) {
+        if (!pBitmap)
           continue;
-        }
+
         int origin_x = FXSYS_round(matrix.e);
         int origin_y = FXSYS_round(matrix.f);
-        if (pGlyphAndPos) {
-          pGlyphAndPos[iChar].m_pGlyph = pBitmap;
-          pGlyphAndPos[iChar].m_OriginX = origin_x;
-          pGlyphAndPos[iChar].m_OriginY = origin_y;
-        } else {
+        if (glyphs.empty()) {
           m_pDevice->SetBitMask(&pBitmap->m_Bitmap, origin_x + pBitmap->m_Left,
                                 origin_y - pBitmap->m_Top, fill_argb);
+        } else {
+          glyphs[iChar].m_pGlyph = pBitmap;
+          glyphs[iChar].m_OriginX = origin_x;
+          glyphs[iChar].m_OriginY = origin_y;
         }
       } else {
         CFX_Matrix image_matrix = pType3Char->m_ImageMatrix;
@@ -479,33 +480,33 @@ FX_BOOL CPDF_RenderStatus::ProcessType3Text(const CPDF_TextObject* textobj,
       }
     }
   }
-  if (pGlyphAndPos) {
-    FX_RECT rect =
-        FXGE_GetGlyphsBBox(pGlyphAndPos, textobj->m_nChars, 0, sa, sd);
-    CFX_DIBitmap bitmap;
-    if (!bitmap.Create((int)(rect.Width() * sa), (int)(rect.Height() * sd),
-                       FXDIB_8bppMask)) {
-      FX_Free(pGlyphAndPos);
-      return TRUE;
-    }
-    bitmap.Clear(0);
-    for (int iChar = 0; iChar < textobj->m_nChars; iChar++) {
-      FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[iChar];
-      if (!glyph.m_pGlyph) {
-        continue;
-      }
-      bitmap.TransferBitmap(
-          (int)((glyph.m_OriginX + glyph.m_pGlyph->m_Left - rect.left) * sa),
-          (int)((glyph.m_OriginY - glyph.m_pGlyph->m_Top - rect.top) * sd),
-          glyph.m_pGlyph->m_Bitmap.GetWidth(),
-          glyph.m_pGlyph->m_Bitmap.GetHeight(), &glyph.m_pGlyph->m_Bitmap, 0,
-          0);
-    }
-    m_pDevice->SetBitMask(&bitmap, rect.left, rect.top, fill_argb);
-    FX_Free(pGlyphAndPos);
+
+  if (glyphs.empty())
+    return TRUE;
+
+  FX_RECT rect = FXGE_GetGlyphsBBox(glyphs, 0, sa, sd);
+  CFX_DIBitmap bitmap;
+  if (!bitmap.Create(static_cast<int>(rect.Width() * sa),
+                     static_cast<int>(rect.Height() * sd), FXDIB_8bppMask)) {
+    return TRUE;
   }
+  bitmap.Clear(0);
+  for (const FXTEXT_GLYPHPOS& glyph : glyphs) {
+    if (!glyph.m_pGlyph)
+      continue;
+
+    bitmap.TransferBitmap(
+        static_cast<int>(
+            (glyph.m_OriginX + glyph.m_pGlyph->m_Left - rect.left) * sa),
+        static_cast<int>((glyph.m_OriginY - glyph.m_pGlyph->m_Top - rect.top) *
+                         sd),
+        glyph.m_pGlyph->m_Bitmap.GetWidth(),
+        glyph.m_pGlyph->m_Bitmap.GetHeight(), &glyph.m_pGlyph->m_Bitmap, 0, 0);
+  }
+  m_pDevice->SetBitMask(&bitmap, rect.left, rect.top, fill_argb);
   return TRUE;
 }
+
 class CPDF_CharPosList {
  public:
   CPDF_CharPosList();
diff --git a/core/fxge/ge/fx_ge_text.cpp b/core/fxge/ge/fx_ge_text.cpp
index 46edaf7cbe..f2867aaf11 100644
--- a/core/fxge/ge/fx_ge_text.cpp
+++ b/core/fxge/ge/fx_ge_text.cpp
@@ -5,6 +5,7 @@
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <limits>
+#include <vector>
 
 #include "core/fxcodec/include/fx_codec.h"
 #include "core/fxge/ge/fx_text_int.h"
@@ -16,11 +17,6 @@
 #include "third_party/skia/include/core/SkTypeface.h"
 #endif
 
-#undef FX_GAMMA
-#undef FX_GAMMA_INVERSE
-#define FX_GAMMA(value) (value)
-#define FX_GAMMA_INVERSE(value) (value)
-
 namespace {
 
 void ResetTransform(FT_Face face) {
@@ -46,83 +42,33 @@ class ScopedFontTransform {
   FT_Face m_Face;
 };
 
-}  // namespace
-
-FX_RECT FXGE_GetGlyphsBBox(FXTEXT_GLYPHPOS* pGlyphAndPos,
-                           int nChars,
-                           int anti_alias,
-                           FX_FLOAT retinaScaleX,
-                           FX_FLOAT retinaScaleY) {
-  FX_RECT rect(0, 0, 0, 0);
-  FX_BOOL bStarted = FALSE;
-  for (int iChar = 0; iChar < nChars; iChar++) {
-    FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[iChar];
-    const CFX_GlyphBitmap* pGlyph = glyph.m_pGlyph;
-    if (!pGlyph) {
-      continue;
-    }
-    int char_left = glyph.m_OriginX + pGlyph->m_Left;
-    int char_width = (int)(pGlyph->m_Bitmap.GetWidth() / retinaScaleX);
-    if (anti_alias == FXFT_RENDER_MODE_LCD) {
-      char_width /= 3;
-    }
-    int char_right = char_left + char_width;
-    int char_top = glyph.m_OriginY - pGlyph->m_Top;
-    int char_bottom =
-        char_top + (int)(pGlyph->m_Bitmap.GetHeight() / retinaScaleY);
-    if (!bStarted) {
-      rect.left = char_left;
-      rect.right = char_right;
-      rect.top = char_top;
-      rect.bottom = char_bottom;
-      bStarted = TRUE;
-    } else {
-      if (rect.left > char_left) {
-        rect.left = char_left;
-      }
-      if (rect.right < char_right) {
-        rect.right = char_right;
-      }
-      if (rect.top > char_top) {
-        rect.top = char_top;
-      }
-      if (rect.bottom < char_bottom) {
-        rect.bottom = char_bottom;
-      }
-    }
-  }
-  return rect;
-}
-static void _AdjustGlyphSpace(FXTEXT_GLYPHPOS* pGlyphAndPos, int nChars) {
-  ASSERT(nChars > 1);
-  FX_BOOL bVertical = FALSE;
-  if (pGlyphAndPos[nChars - 1].m_OriginX == pGlyphAndPos[0].m_OriginX) {
-    bVertical = TRUE;
-  } else if (pGlyphAndPos[nChars - 1].m_OriginY != pGlyphAndPos[0].m_OriginY) {
+void AdjustGlyphSpace(std::vector<FXTEXT_GLYPHPOS>* pGlyphAndPos) {
+  ASSERT(pGlyphAndPos->size() > 1);
+  std::vector<FXTEXT_GLYPHPOS>& glyphs = *pGlyphAndPos;
+  bool bVertical = glyphs.back().m_OriginX == glyphs.front().m_OriginX;
+  if (!bVertical && (glyphs.back().m_OriginY != glyphs.front().m_OriginY))
     return;
-  }
-  int i = nChars - 1;
-  int* next_origin =
-      bVertical ? &pGlyphAndPos[i].m_OriginY : &pGlyphAndPos[i].m_OriginX;
-  FX_FLOAT next_origin_f =
-      bVertical ? pGlyphAndPos[i].m_fOriginY : pGlyphAndPos[i].m_fOriginX;
-  for (i--; i > 0; i--) {
-    int* this_origin =
-        bVertical ? &pGlyphAndPos[i].m_OriginY : &pGlyphAndPos[i].m_OriginX;
-    FX_FLOAT this_origin_f =
-        bVertical ? pGlyphAndPos[i].m_fOriginY : pGlyphAndPos[i].m_fOriginX;
-    int space = (*next_origin) - (*this_origin);
-    FX_FLOAT space_f = next_origin_f - this_origin_f;
+
+  for (size_t i = glyphs.size() - 1; i > 1; --i) {
+    FXTEXT_GLYPHPOS& next = glyphs[i];
+    int next_origin = bVertical ? next.m_OriginY : next.m_OriginX;
+    FX_FLOAT next_origin_f = bVertical ? next.m_fOriginY : next.m_fOriginX;
+
+    FXTEXT_GLYPHPOS& current = glyphs[i - 1];
+    int& current_origin = bVertical ? current.m_OriginY : current.m_OriginX;
+    FX_FLOAT current_origin_f =
+        bVertical ? current.m_fOriginY : current.m_fOriginX;
+
+    int space = next_origin - current_origin;
+    FX_FLOAT space_f = next_origin_f - current_origin_f;
     FX_FLOAT error =
-        (FX_FLOAT)(FXSYS_fabs(space_f) - FXSYS_fabs((FX_FLOAT)(space)));
-    if (error > 0.5f) {
-      *this_origin += space > 0 ? -1 : 1;
-    }
-    next_origin = this_origin;
-    next_origin_f = this_origin_f;
+        FXSYS_fabs(space_f) - FXSYS_fabs(static_cast<FX_FLOAT>(space));
+    if (error > 0.5f)
+      current_origin += space > 0 ? -1 : 1;
   }
 }
-static const uint8_t g_TextGammaAdjust[256] = {
+
+const uint8_t g_TextGammaAdjust[256] = {
     0,   2,   3,   4,   6,   7,   8,   10,  11,  12,  13,  15,  16,  17,  18,
     19,  21,  22,  23,  24,  25,  26,  27,  29,  30,  31,  32,  33,  34,  35,
     36,  38,  39,  40,  41,  42,  43,  44,  45,  46,  47,  48,  49,  51,  52,
@@ -142,12 +88,271 @@ static const uint8_t g_TextGammaAdjust[256] = {
     241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 250, 251, 252, 253, 254,
     255,
 };
-#define ADJUST_ALPHA(background, foreground, src_alpha, text_flags, a) \
-  src_alpha = g_TextGammaAdjust[(uint8_t)src_alpha];
-void _Color2Argb(FX_ARGB& argb,
-                 uint32_t color,
-                 int alpha_flag,
-                 void* pIccTransform) {
+
+int TextGammaAdjust(int value) {
+  ASSERT(value >= 0);
+  ASSERT(value <= 255);
+  return g_TextGammaAdjust[value];
+}
+
+int CalcAlpha(int src, int alpha) {
+  return src * alpha / 255;
+}
+
+void Merge(uint8_t src, int channel, int alpha, uint8_t* dest) {
+  *dest = FXDIB_ALPHA_MERGE(*dest, channel, CalcAlpha(src, alpha));
+}
+
+void MergeGammaAdjust(uint8_t src, int channel, int alpha, uint8_t* dest) {
+  *dest =
+      FXDIB_ALPHA_MERGE(*dest, channel, CalcAlpha(TextGammaAdjust(src), alpha));
+}
+
+void MergeGammaAdjustBgr(const uint8_t* src,
+                         int r,
+                         int g,
+                         int b,
+                         int a,
+                         uint8_t* dest) {
+  MergeGammaAdjust(src[0], b, a, &dest[0]);
+  MergeGammaAdjust(src[1], g, a, &dest[1]);
+  MergeGammaAdjust(src[2], r, a, &dest[2]);
+}
+
+void MergeGammaAdjustRgb(const uint8_t* src,
+                         int r,
+                         int g,
+                         int b,
+                         int a,
+                         uint8_t* dest) {
+  MergeGammaAdjust(src[2], b, a, &dest[0]);
+  MergeGammaAdjust(src[1], g, a, &dest[1]);
+  MergeGammaAdjust(src[0], r, a, &dest[2]);
+}
+
+int AverageRgb(const uint8_t* src) {
+  return (src[0] + src[1] + src[2]) / 3;
+}
+
+uint8_t CalculateDestAlpha(uint8_t back_alpha, int src_alpha) {
+  return back_alpha + src_alpha - back_alpha * src_alpha / 255;
+}
+
+void ApplyDestAlpha(uint8_t back_alpha,
+                    int src_alpha,
+                    int r,
+                    int g,
+                    int b,
+                    uint8_t* dest) {
+  uint8_t dest_alpha = CalculateDestAlpha(back_alpha, src_alpha);
+  int alpha_ratio = src_alpha * 255 / dest_alpha;
+  dest[0] = FXDIB_ALPHA_MERGE(dest[0], b, alpha_ratio);
+  dest[1] = FXDIB_ALPHA_MERGE(dest[1], g, alpha_ratio);
+  dest[2] = FXDIB_ALPHA_MERGE(dest[2], r, alpha_ratio);
+  dest[3] = dest_alpha;
+}
+
+void NormalizeRgbDst(int src_value, int r, int g, int b, int a, uint8_t* dest) {
+  int src_alpha = CalcAlpha(TextGammaAdjust(src_value), a);
+  dest[0] = FXDIB_ALPHA_MERGE(dest[0], b, src_alpha);
+  dest[1] = FXDIB_ALPHA_MERGE(dest[1], g, src_alpha);
+  dest[2] = FXDIB_ALPHA_MERGE(dest[2], r, src_alpha);
+}
+
+void NormalizeRgbSrc(int src_value, int r, int g, int b, int a, uint8_t* dest) {
+  int src_alpha = CalcAlpha(TextGammaAdjust(src_value), a);
+  if (src_alpha == 0)
+    return;
+
+  dest[0] = FXDIB_ALPHA_MERGE(dest[0], b, src_alpha);
+  dest[1] = FXDIB_ALPHA_MERGE(dest[1], g, src_alpha);
+  dest[2] = FXDIB_ALPHA_MERGE(dest[2], r, src_alpha);
+}
+
+void NormalizeArgbDest(int src_value,
+                       int r,
+                       int g,
+                       int b,
+                       int a,
+                       uint8_t* dest) {
+  int src_alpha = CalcAlpha(TextGammaAdjust(src_value), a);
+  uint8_t back_alpha = dest[3];
+  if (back_alpha == 0) {
+    FXARGB_SETDIB(dest, FXARGB_MAKE(src_alpha, r, g, b));
+  } else if (src_alpha != 0) {
+    ApplyDestAlpha(back_alpha, src_alpha, r, g, b, dest);
+  }
+}
+
+void NormalizeArgbSrc(int src_value,
+                      int r,
+                      int g,
+                      int b,
+                      int a,
+                      uint8_t* dest) {
+  int src_alpha = CalcAlpha(TextGammaAdjust(src_value), a);
+  if (src_alpha == 0)
+    return;
+
+  uint8_t back_alpha = dest[3];
+  if (back_alpha == 0) {
+    FXARGB_SETDIB(dest, FXARGB_MAKE(src_alpha, r, g, b));
+  } else {
+    ApplyDestAlpha(back_alpha, src_alpha, r, g, b, dest);
+  }
+}
+
+void NextPixel(uint8_t** src_scan, uint8_t** dst_scan, int bpp) {
+  *src_scan += 3;
+  *dst_scan += bpp;
+}
+
+void SetAlpha(uint8_t* alpha) {
+  alpha[3] = 255;
+}
+
+void SetAlphaDoNothing(uint8_t* alpha) {}
+
+void DrawNormalTextHelper(CFX_DIBitmap* bitmap,
+                          const CFX_DIBitmap* pGlyph,
+                          int nrows,
+                          int left,
+                          int top,
+                          int start_col,
+                          int end_col,
+                          bool bNormal,
+                          bool bBGRStripe,
+                          int x_subpixel,
+                          int a,
+                          int r,
+                          int g,
+                          int b) {
+  const bool has_alpha = bitmap->GetFormat() == FXDIB_Argb;
+  uint8_t* src_buf = pGlyph->GetBuffer();
+  int src_pitch = pGlyph->GetPitch();
+  uint8_t* dest_buf = bitmap->GetBuffer();
+  int dest_pitch = bitmap->GetPitch();
+  const int Bpp = has_alpha ? 4 : bitmap->GetBPP() / 8;
+  auto* pNormalizeSrcFunc = has_alpha ? &NormalizeArgbSrc : &NormalizeRgbDst;
+  auto* pNormalizeDstFunc = has_alpha ? &NormalizeArgbDest : &NormalizeRgbSrc;
+  auto* pSetAlpha = has_alpha ? &SetAlpha : &SetAlphaDoNothing;
+
+  for (int row = 0; row < nrows; row++) {
+    int dest_row = row + top;
+    if (dest_row < 0 || dest_row >= bitmap->GetHeight())
+      continue;
+
+    uint8_t* src_scan = src_buf + row * src_pitch + (start_col - left) * 3;
+    uint8_t* dest_scan = dest_buf + dest_row * dest_pitch + start_col * Bpp;
+    if (bBGRStripe) {
+      if (x_subpixel == 0) {
+        for (int col = start_col; col < end_col; col++) {
+          if (has_alpha) {
+            Merge(src_scan[2], r, a, &dest_scan[2]);
+            Merge(src_scan[1], g, a, &dest_scan[1]);
+            Merge(src_scan[0], b, a, &dest_scan[0]);
+          } else {
+            MergeGammaAdjustBgr(&src_scan[0], r, g, b, a, &dest_scan[0]);
+          }
+          pSetAlpha(dest_scan);
+          NextPixel(&src_scan, &dest_scan, Bpp);
+        }
+      } else if (x_subpixel == 1) {
+        MergeGammaAdjust(src_scan[1], r, a, &dest_scan[2]);
+        MergeGammaAdjust(src_scan[0], g, a, &dest_scan[1]);
+        if (start_col > left)
+          MergeGammaAdjust(src_scan[-1], b, a, &dest_scan[0]);
+        pSetAlpha(dest_scan);
+        NextPixel(&src_scan, &dest_scan, Bpp);
+        for (int col = start_col + 1; col < end_col - 1; col++) {
+          MergeGammaAdjustBgr(&src_scan[-1], r, g, b, a, &dest_scan[0]);
+          pSetAlpha(dest_scan);
+          NextPixel(&src_scan, &dest_scan, Bpp);
+        }
+      } else {
+        MergeGammaAdjust(src_scan[0], r, a, &dest_scan[2]);
+        if (start_col > left) {
+          MergeGammaAdjust(src_scan[-1], g, a, &dest_scan[1]);
+          MergeGammaAdjust(src_scan[-2], b, a, &dest_scan[0]);
+        }
+        pSetAlpha(dest_scan);
+        NextPixel(&src_scan, &dest_scan, Bpp);
+        for (int col = start_col + 1; col < end_col - 1; col++) {
+          MergeGammaAdjustBgr(&src_scan[-2], r, g, b, a, &dest_scan[0]);
+          pSetAlpha(dest_scan);
+          NextPixel(&src_scan, &dest_scan, Bpp);
+        }
+      }
+    } else {
+      if (x_subpixel == 0) {
+        for (int col = start_col; col < end_col; col++) {
+          if (bNormal) {
+            int src_value = AverageRgb(&src_scan[0]);
+            pNormalizeDstFunc(src_value, r, g, b, a, dest_scan);
+          } else {
+            MergeGammaAdjustRgb(&src_scan[0], r, g, b, a, &dest_scan[0]);
+            pSetAlpha(dest_scan);
+          }
+          NextPixel(&src_scan, &dest_scan, Bpp);
+        }
+      } else if (x_subpixel == 1) {
+        if (bNormal) {
+          int src_value = start_col > left ? AverageRgb(&src_scan[-1])
+                                           : (src_scan[0] + src_scan[1]) / 3;
+          pNormalizeSrcFunc(src_value, r, g, b, a, dest_scan);
+        } else {
+          if (start_col > left)
+            MergeGammaAdjust(src_scan[-1], r, a, &dest_scan[2]);
+          MergeGammaAdjust(src_scan[0], g, a, &dest_scan[1]);
+          MergeGammaAdjust(src_scan[1], b, a, &dest_scan[0]);
+          pSetAlpha(dest_scan);
+        }
+        NextPixel(&src_scan, &dest_scan, Bpp);
+        for (int col = start_col + 1; col < end_col; col++) {
+          if (bNormal) {
+            int src_value = AverageRgb(&src_scan[-1]);
+            pNormalizeDstFunc(src_value, r, g, b, a, dest_scan);
+          } else {
+            MergeGammaAdjustRgb(&src_scan[-1], r, g, b, a, &dest_scan[0]);
+            pSetAlpha(dest_scan);
+          }
+          NextPixel(&src_scan, &dest_scan, Bpp);
+        }
+      } else {
+        if (bNormal) {
+          int src_value =
+              start_col > left ? AverageRgb(&src_scan[-2]) : src_scan[0] / 3;
+          pNormalizeSrcFunc(src_value, r, g, b, a, dest_scan);
+        } else {
+          if (start_col > left) {
+            MergeGammaAdjust(src_scan[-2], r, a, &dest_scan[2]);
+            MergeGammaAdjust(src_scan[-1], g, a, &dest_scan[1]);
+          }
+          MergeGammaAdjust(src_scan[0], b, a, &dest_scan[0]);
+          pSetAlpha(dest_scan);
+        }
+        NextPixel(&src_scan, &dest_scan, Bpp);
+        for (int col = start_col + 1; col < end_col; col++) {
+          if (bNormal) {
+            int src_value = AverageRgb(&src_scan[-2]);
+            pNormalizeDstFunc(src_value, r, g, b, a, dest_scan);
+          } else {
+            MergeGammaAdjustRgb(&src_scan[-2], r, g, b, a, &dest_scan[0]);
+            pSetAlpha(dest_scan);
+          }
+          NextPixel(&src_scan, &dest_scan, Bpp);
+        }
+      }
+    }
+  }
+}
+
+}  // namespace
+
+void Color2Argb(FX_ARGB& argb,
+                uint32_t color,
+                int alpha_flag,
+                void* pIccTransform) {
   if (!pIccTransform && !FXGETFLAG_COLORTYPE(alpha_flag)) {
     argb = color;
     return;
@@ -178,6 +383,43 @@ void _Color2Argb(FX_ARGB& argb,
                                : FXGETFLAG_ALPHA_STROKE(alpha_flag);
   argb = FXARGB_MAKE(bgra[3], bgra[2], bgra[1], bgra[0]);
 }
+
+FX_RECT FXGE_GetGlyphsBBox(const std::vector<FXTEXT_GLYPHPOS>& glyphs,
+                           int anti_alias,
+                           FX_FLOAT retinaScaleX,
+                           FX_FLOAT retinaScaleY) {
+  FX_RECT rect(0, 0, 0, 0);
+  bool bStarted = false;
+  for (const FXTEXT_GLYPHPOS& glyph : glyphs) {
+    const CFX_GlyphBitmap* pGlyph = glyph.m_pGlyph;
+    if (!pGlyph)
+      continue;
+
+    int char_left = glyph.m_OriginX + pGlyph->m_Left;
+    int char_width = (int)(pGlyph->m_Bitmap.GetWidth() / retinaScaleX);
+    if (anti_alias == FXFT_RENDER_MODE_LCD) {
+      char_width /= 3;
+    }
+    int char_right = char_left + char_width;
+    int char_top = glyph.m_OriginY - pGlyph->m_Top;
+    int char_bottom =
+        char_top + (int)(pGlyph->m_Bitmap.GetHeight() / retinaScaleY);
+    if (!bStarted) {
+      rect.left = char_left;
+      rect.right = char_right;
+      rect.top = char_top;
+      rect.bottom = char_bottom;
+      bStarted = true;
+    } else {
+      rect.left = std::min(rect.left, char_left);
+      rect.right = std::max(rect.right, char_right);
+      rect.top = std::min(rect.top, char_top);
+      rect.bottom = std::max(rect.bottom, char_bottom);
+    }
+  }
+  return rect;
+}
+
 FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
                                          const FXTEXT_CHARPOS* pCharPos,
                                          CFX_Font* pFont,
@@ -228,7 +470,8 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
       return TRUE;
     }
   }
-  CFX_Matrix char2device, deviceCtm, text2Device;
+  CFX_Matrix char2device;
+  CFX_Matrix text2Device;
   if (pText2Device) {
     char2device = *pText2Device;
     text2Device = *pText2Device;
@@ -247,16 +490,9 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
     }
   }
   int anti_alias = FXFT_RENDER_MODE_MONO;
-  FX_BOOL bNormal = FALSE;
+  bool bNormal = false;
   if ((text_flags & FXTEXT_NOSMOOTH) == 0) {
     if (m_DeviceClass == FXDC_DISPLAY && m_bpp > 1) {
-      FX_BOOL bClearType;
-      if (!pFont->GetFace() &&
-          !(pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_CLEARTYPE)) {
-        bClearType = FALSE;
-      } else {
-        bClearType = text_flags & FXTEXT_CLEARTYPE;
-      }
       if (!CFX_GEModule::Get()->GetFontMgr()->FTLibrarySupportsHinting()) {
         // Some Freetype implementations (like the one packaged with Fedora) do
         // not support hinting due to patents 6219025, 6239783, 6307566,
@@ -266,35 +502,36 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
         anti_alias = FXFT_RENDER_MODE_NORMAL;
       } else if ((m_RenderCaps & (FXRC_ALPHA_OUTPUT | FXRC_CMYK_OUTPUT))) {
         anti_alias = FXFT_RENDER_MODE_LCD;
-        bNormal = TRUE;
+        bNormal = true;
       } else if (m_bpp < 16) {
         anti_alias = FXFT_RENDER_MODE_NORMAL;
       } else {
-        if (bClearType == FALSE) {
-          anti_alias = FXFT_RENDER_MODE_LCD;
-          bNormal = TRUE;
-        } else {
-          anti_alias = FXFT_RENDER_MODE_LCD;
+        anti_alias = FXFT_RENDER_MODE_LCD;
+
+        bool bClearType = false;
+        if (pFont->GetFace() ||
+            (pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_CLEARTYPE)) {
+          bClearType = !!(text_flags & FXTEXT_CLEARTYPE);
         }
+        bNormal = !bClearType;
       }
     }
   }
-  if (!pCache) {
+  if (!pCache)
     pCache = CFX_GEModule::Get()->GetFontCache();
-  }
+
   CFX_FaceCache* pFaceCache = pCache->GetCachedFace(pFont);
   FX_FONTCACHE_DEFINE(pCache, pFont);
-  FXTEXT_GLYPHPOS* pGlyphAndPos = FX_Alloc(FXTEXT_GLYPHPOS, nChars);
-  int iChar;
-  deviceCtm = char2device;
+  std::vector<FXTEXT_GLYPHPOS> glyphs(nChars);
   CFX_Matrix matrixCTM = GetCTM();
   FX_FLOAT scale_x = FXSYS_fabs(matrixCTM.a);
   FX_FLOAT scale_y = FXSYS_fabs(matrixCTM.d);
+  CFX_Matrix deviceCtm = char2device;
   deviceCtm.Concat(scale_x, 0, 0, scale_y, 0, 0);
   text2Device.Concat(scale_x, 0, 0, scale_y, 0, 0);
-  for (iChar = 0; iChar < nChars; iChar++) {
-    FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[iChar];
-    const FXTEXT_CHARPOS& charpos = pCharPos[iChar];
+  for (size_t i = 0; i < glyphs.size(); ++i) {
+    FXTEXT_GLYPHPOS& glyph = glyphs[i];
+    const FXTEXT_CHARPOS& charpos = pCharPos[i];
     glyph.m_fOriginX = charpos.m_OriginX;
     glyph.m_fOriginY = charpos.m_OriginY;
     text2Device.Transform(glyph.m_fOriginX, glyph.m_fOriginY);
@@ -318,10 +555,10 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
           charpos.m_FontCharWidth, anti_alias, nativetext_flags);
     }
   }
-  if (anti_alias < FXFT_RENDER_MODE_LCD && nChars > 1) {
-    _AdjustGlyphSpace(pGlyphAndPos, nChars);
-  }
-  FX_RECT bmp_rect1 = FXGE_GetGlyphsBBox(pGlyphAndPos, nChars, anti_alias);
+  if (anti_alias < FXFT_RENDER_MODE_LCD && glyphs.size() > 1)
+    AdjustGlyphSpace(&glyphs);
+
+  FX_RECT bmp_rect1 = FXGE_GetGlyphsBBox(glyphs, anti_alias);
   if (scale_x > 1 && scale_y > 1) {
     bmp_rect1.left--;
     bmp_rect1.top--;
@@ -333,79 +570,64 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
                    FXSYS_round((FX_FLOAT)bmp_rect1.right / scale_x),
                    FXSYS_round((FX_FLOAT)bmp_rect1.bottom / scale_y));
   bmp_rect.Intersect(m_ClipBox);
-  if (bmp_rect.IsEmpty()) {
-    FX_Free(pGlyphAndPos);
+  if (bmp_rect.IsEmpty())
     return TRUE;
-  }
+
   int pixel_width = FXSYS_round(bmp_rect.Width() * scale_x);
   int pixel_height = FXSYS_round(bmp_rect.Height() * scale_y);
   int pixel_left = FXSYS_round(bmp_rect.left * scale_x);
   int pixel_top = FXSYS_round(bmp_rect.top * scale_y);
   if (anti_alias == FXFT_RENDER_MODE_MONO) {
     CFX_DIBitmap bitmap;
-    if (!bitmap.Create(pixel_width, pixel_height, FXDIB_1bppMask)) {
-      FX_Free(pGlyphAndPos);
+    if (!bitmap.Create(pixel_width, pixel_height, FXDIB_1bppMask))
       return FALSE;
-    }
+
     bitmap.Clear(0);
-    for (iChar = 0; iChar < nChars; iChar++) {
-      FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[iChar];
-      if (!glyph.m_pGlyph) {
+    for (const FXTEXT_GLYPHPOS& glyph : glyphs) {
+      if (!glyph.m_pGlyph)
         continue;
-      }
+
       const CFX_DIBitmap* pGlyph = &glyph.m_pGlyph->m_Bitmap;
       bitmap.TransferBitmap(
           glyph.m_OriginX + glyph.m_pGlyph->m_Left - pixel_left,
           glyph.m_OriginY - glyph.m_pGlyph->m_Top - pixel_top,
           pGlyph->GetWidth(), pGlyph->GetHeight(), pGlyph, 0, 0);
     }
-    FX_Free(pGlyphAndPos);
     return SetBitMask(&bitmap, bmp_rect.left, bmp_rect.top, fill_color);
   }
   CFX_DIBitmap bitmap;
   if (m_bpp == 8) {
-    if (!bitmap.Create(pixel_width, pixel_height, FXDIB_8bppMask)) {
-      FX_Free(pGlyphAndPos);
+    if (!bitmap.Create(pixel_width, pixel_height, FXDIB_8bppMask))
       return FALSE;
-    }
   } else {
-    if (!CreateCompatibleBitmap(&bitmap, pixel_width, pixel_height)) {
-      FX_Free(pGlyphAndPos);
+    if (!CreateCompatibleBitmap(&bitmap, pixel_width, pixel_height))
       return FALSE;
-    }
   }
+
   if (!bitmap.HasAlpha() && !bitmap.IsAlphaMask()) {
     bitmap.Clear(0xFFFFFFFF);
-    if (!GetDIBits(&bitmap, bmp_rect.left, bmp_rect.top)) {
-      FX_Free(pGlyphAndPos);
+    if (!GetDIBits(&bitmap, bmp_rect.left, bmp_rect.top))
       return FALSE;
-    }
   } else {
     bitmap.Clear(0);
     if (bitmap.m_pAlphaMask) {
       bitmap.m_pAlphaMask->Clear(0);
     }
   }
+
   int dest_width = pixel_width;
-  uint8_t* dest_buf = bitmap.GetBuffer();
-  int dest_pitch = bitmap.GetPitch();
-  int Bpp = bitmap.GetBPP() / 8;
   int a = 0;
   int r = 0;
   int g = 0;
   int b = 0;
   if (anti_alias == FXFT_RENDER_MODE_LCD) {
-    _Color2Argb(fill_color, fill_color, alpha_flag | (1 << 24), pIccTransform);
+    Color2Argb(fill_color, fill_color, alpha_flag | (1 << 24), pIccTransform);
     ArgbDecode(fill_color, a, r, g, b);
-    r = FX_GAMMA(r);
-    g = FX_GAMMA(g);
-    b = FX_GAMMA(b);
   }
-  for (iChar = 0; iChar < nChars; iChar++) {
-    FXTEXT_GLYPHPOS& glyph = pGlyphAndPos[iChar];
-    if (!glyph.m_pGlyph) {
+  for (const FXTEXT_GLYPHPOS& glyph : glyphs) {
+    if (!glyph.m_pGlyph)
       continue;
-    }
+
     const CFX_DIBitmap* pGlyph = &glyph.m_pGlyph->m_Bitmap;
     int left = glyph.m_OriginX + glyph.m_pGlyph->m_Left - pixel_left;
     int top = glyph.m_OriginY - glyph.m_pGlyph->m_Top - pixel_top;
@@ -413,704 +635,23 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
     int nrows = pGlyph->GetHeight();
     if (anti_alias == FXFT_RENDER_MODE_NORMAL) {
       if (!bitmap.CompositeMask(left, top, ncols, nrows, pGlyph, fill_color, 0,
-                                0, FXDIB_BLEND_NORMAL, NULL, FALSE, alpha_flag,
-                                pIccTransform)) {
-        FX_Free(pGlyphAndPos);
+                                0, FXDIB_BLEND_NORMAL, nullptr, FALSE,
+                                alpha_flag, pIccTransform)) {
         return FALSE;
       }
       continue;
     }
+
     bool bBGRStripe = !!(text_flags & FXTEXT_BGR_STRIPE);
     ncols /= 3;
     int x_subpixel = (int)(glyph.m_fOriginX * 3) % 3;
-    uint8_t* src_buf = pGlyph->GetBuffer();
-    int src_pitch = pGlyph->GetPitch();
-    int start_col = left;
-    if (start_col < 0) {
-      start_col = 0;
-    }
-    int end_col = left + ncols;
-    if (end_col > dest_width) {
-      end_col = dest_width;
-    }
-    if (start_col >= end_col) {
+    int start_col = std::max(left, 0);
+    int end_col = std::min(left + ncols, dest_width);
+    if (start_col >= end_col)
       continue;
-    }
-    if (bitmap.GetFormat() == FXDIB_Argb) {
-      for (int row = 0; row < nrows; row++) {
-        int dest_row = row + top;
-        if (dest_row < 0 || dest_row >= bitmap.GetHeight()) {
-          continue;
-        }
-        uint8_t* src_scan = src_buf + row * src_pitch + (start_col - left) * 3;
-        uint8_t* dest_scan =
-            dest_buf + dest_row * dest_pitch + (start_col << 2);
-        if (bBGRStripe) {
-          if (x_subpixel == 0) {
-            for (int col = start_col; col < end_col; col++) {
-              int src_alpha = src_scan[2];
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[1];
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[0];
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-          } else if (x_subpixel == 1) {
-            int src_alpha = src_scan[1];
-            ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-            src_alpha = src_alpha * a / 255;
-            dest_scan[2] = FX_GAMMA_INVERSE(
-                FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-            src_alpha = src_scan[0];
-            ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-            src_alpha = src_alpha * a / 255;
-            dest_scan[1] = FX_GAMMA_INVERSE(
-                FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-            if (start_col > left) {
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-            }
-            dest_scan[3] = 255;
-            dest_scan += 4;
-            src_scan += 3;
-            for (int col = start_col + 1; col < end_col - 1; col++) {
-              int src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-          } else {
-            int src_alpha = src_scan[0];
-            ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-            src_alpha = src_alpha * a / 255;
-            dest_scan[2] = FX_GAMMA_INVERSE(
-                FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-            if (start_col > left) {
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[-2];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-            }
-            dest_scan[3] = 255;
-            dest_scan += 4;
-            src_scan += 3;
-            for (int col = start_col + 1; col < end_col - 1; col++) {
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[-2];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-          }
-        } else {
-          if (x_subpixel == 0) {
-            for (int col = start_col; col < end_col; col++) {
-              if (bNormal) {
-                int src_alpha1 = (src_scan[0] + src_scan[1] + src_scan[2]) / 3;
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-                src_alpha1 = src_alpha1 * a / 255;
-                uint8_t back_alpha = dest_scan[3];
-                if (back_alpha == 0) {
-                  FXARGB_SETDIB(dest_scan, FXARGB_MAKE(src_alpha1, r, g, b));
-                  dest_scan += 4;
-                  src_scan += 3;
-                  continue;
-                }
-                if (src_alpha1 == 0) {
-                  dest_scan += 4;
-                  src_scan += 3;
-                  continue;
-                }
-                uint8_t dest_alpha =
-                    back_alpha + src_alpha1 - back_alpha * src_alpha1 / 255;
-                dest_scan[3] = dest_alpha;
-                int alpha_ratio = src_alpha1 * 255 / dest_alpha;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, alpha_ratio));
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, alpha_ratio));
-                dest_scan[0] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, alpha_ratio));
-                dest_scan += 4;
-                src_scan += 3;
-                continue;
-              }
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[2];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-          } else if (x_subpixel == 1) {
-            if (bNormal) {
-              int src_alpha1 =
-                  start_col > left
-                      ? ((src_scan[-1] + src_scan[0] + src_scan[1]) / 3)
-                      : ((src_scan[0] + src_scan[1]) / 3);
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-              src_alpha1 = src_alpha1 * a / 255;
-              if (src_alpha1 == 0) {
-                dest_scan += 4;
-                src_scan += 3;
-              } else {
-                uint8_t back_alpha = dest_scan[3];
-                if (back_alpha == 0) {
-                  FXARGB_SETDIB(dest_scan, FXARGB_MAKE(src_alpha1, r, g, b));
-                } else {
-                  uint8_t dest_alpha =
-                      back_alpha + src_alpha1 - back_alpha * src_alpha1 / 255;
-                  dest_scan[3] = dest_alpha;
-                  int alpha_ratio = src_alpha1 * 255 / dest_alpha;
-                  dest_scan[2] = FX_GAMMA_INVERSE(FXDIB_ALPHA_MERGE(
-                      FX_GAMMA(dest_scan[2]), r, alpha_ratio));
-                  dest_scan[1] = FX_GAMMA_INVERSE(FXDIB_ALPHA_MERGE(
-                      FX_GAMMA(dest_scan[1]), g, alpha_ratio));
-                  dest_scan[0] = FX_GAMMA_INVERSE(FXDIB_ALPHA_MERGE(
-                      FX_GAMMA(dest_scan[0]), b, alpha_ratio));
-                }
-                dest_scan += 4;
-                src_scan += 3;
-              }
-            } else {
-              if (start_col > left) {
-                int src_alpha = src_scan[-1];
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-                src_alpha = src_alpha * a / 255;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              }
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-            for (int col = start_col + 1; col < end_col; col++) {
-              if (bNormal) {
-                int src_alpha1 = (src_scan[-1] + src_scan[0] + src_scan[1]) / 3;
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-                src_alpha1 = src_alpha1 * a / 255;
-                uint8_t back_alpha = dest_scan[3];
-                if (back_alpha == 0) {
-                  FXARGB_SETDIB(dest_scan, FXARGB_MAKE(src_alpha1, r, g, b));
-                  dest_scan += 4;
-                  src_scan += 3;
-                  continue;
-                }
-                if (src_alpha1 == 0) {
-                  dest_scan += 4;
-                  src_scan += 3;
-                  continue;
-                }
-                uint8_t dest_alpha =
-                    back_alpha + src_alpha1 - back_alpha * src_alpha1 / 255;
-                dest_scan[3] = dest_alpha;
-                int alpha_ratio = src_alpha1 * 255 / dest_alpha;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, alpha_ratio));
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, alpha_ratio));
-                dest_scan[0] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, alpha_ratio));
-                dest_scan += 4;
-                src_scan += 3;
-                continue;
-              }
-              int src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-          } else {
-            if (bNormal) {
-              int src_alpha1 =
-                  start_col > left
-                      ? ((src_scan[-2] + src_scan[-1] + src_scan[0]) / 3)
-                      : ((src_scan[0]) / 3);
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-              src_alpha1 = src_alpha1 * a / 255;
-              if (src_alpha1 == 0) {
-                dest_scan += 4;
-                src_scan += 3;
-              } else {
-                uint8_t back_alpha = dest_scan[3];
-                if (back_alpha == 0) {
-                  FXARGB_SETDIB(dest_scan, FXARGB_MAKE(src_alpha1, r, g, b));
-                } else {
-                  uint8_t dest_alpha =
-                      back_alpha + src_alpha1 - back_alpha * src_alpha1 / 255;
-                  dest_scan[3] = dest_alpha;
-                  int alpha_ratio = src_alpha1 * 255 / dest_alpha;
-                  dest_scan[2] = FX_GAMMA_INVERSE(FXDIB_ALPHA_MERGE(
-                      FX_GAMMA(dest_scan[2]), r, alpha_ratio));
-                  dest_scan[1] = FX_GAMMA_INVERSE(FXDIB_ALPHA_MERGE(
-                      FX_GAMMA(dest_scan[1]), g, alpha_ratio));
-                  dest_scan[0] = FX_GAMMA_INVERSE(FXDIB_ALPHA_MERGE(
-                      FX_GAMMA(dest_scan[0]), b, alpha_ratio));
-                }
-                dest_scan += 4;
-                src_scan += 3;
-              }
-            } else {
-              if (start_col > left) {
-                int src_alpha = src_scan[-2];
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-                src_alpha = src_alpha * a / 255;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-                src_alpha = src_scan[-1];
-                ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-                src_alpha = src_alpha * a / 255;
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              }
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-            for (int col = start_col + 1; col < end_col; col++) {
-              if (bNormal) {
-                int src_alpha1 =
-                    (src_scan[-2] + src_scan[-1] + src_scan[0]) / 3;
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-                src_alpha1 = src_alpha1 * a / 255;
-                uint8_t back_alpha = dest_scan[3];
-                if (back_alpha == 0) {
-                  FXARGB_SETDIB(dest_scan, FXARGB_MAKE(src_alpha1, r, g, b));
-                  dest_scan += 4;
-                  src_scan += 3;
-                  continue;
-                }
-                if (src_alpha1 == 0) {
-                  dest_scan += 4;
-                  src_scan += 3;
-                  continue;
-                }
-                uint8_t dest_alpha =
-                    back_alpha + src_alpha1 - back_alpha * src_alpha1 / 255;
-                dest_scan[3] = dest_alpha;
-                int alpha_ratio = src_alpha1 * 255 / dest_alpha;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, alpha_ratio));
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, alpha_ratio));
-                dest_scan[0] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, alpha_ratio));
-                dest_scan += 4;
-                src_scan += 3;
-                continue;
-              }
-              int src_alpha = src_scan[-2];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan[3] = 255;
-              dest_scan += 4;
-              src_scan += 3;
-            }
-          }
-        }
-      }
-    } else {
-      for (int row = 0; row < nrows; row++) {
-        int dest_row = row + top;
-        if (dest_row < 0 || dest_row >= bitmap.GetHeight()) {
-          continue;
-        }
-        uint8_t* src_scan = src_buf + row * src_pitch + (start_col - left) * 3;
-        uint8_t* dest_scan = dest_buf + dest_row * dest_pitch + start_col * Bpp;
-        if (bBGRStripe) {
-          if (x_subpixel == 0) {
-            for (int col = start_col; col < end_col; col++) {
-              int src_alpha = src_scan[2];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-          } else if (x_subpixel == 1) {
-            int src_alpha = src_scan[1];
-            ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-            src_alpha = src_alpha * a / 255;
-            dest_scan[2] = FX_GAMMA_INVERSE(
-                FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-            src_alpha = src_scan[0];
-            ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-            src_alpha = src_alpha * a / 255;
-            dest_scan[1] = FX_GAMMA_INVERSE(
-                FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-            if (start_col > left) {
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-            }
-            dest_scan += Bpp;
-            src_scan += 3;
-            for (int col = start_col + 1; col < end_col - 1; col++) {
-              int src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-          } else {
-            int src_alpha = src_scan[0];
-            ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-            src_alpha = src_alpha * a / 255;
-            dest_scan[2] = FX_GAMMA_INVERSE(
-                FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-            if (start_col > left) {
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[-2];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-            }
-            dest_scan += Bpp;
-            src_scan += 3;
-            for (int col = start_col + 1; col < end_col - 1; col++) {
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[-2];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-          }
-        } else {
-          if (x_subpixel == 0) {
-            for (int col = start_col; col < end_col; col++) {
-              if (bNormal) {
-                int src_alpha1 = (src_scan[0] + src_scan[1] + src_scan[2]) / 3;
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-                src_alpha1 = src_alpha1 * a / 255;
-                if (src_alpha1 == 0) {
-                  dest_scan += Bpp;
-                  src_scan += 3;
-                  continue;
-                }
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha1));
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha1));
-                dest_scan[0] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha1));
-                dest_scan += Bpp;
-                src_scan += 3;
-                continue;
-              }
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[2];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-          } else if (x_subpixel == 1) {
-            if (bNormal) {
-              int src_alpha1 =
-                  start_col > left
-                      ? (src_scan[0] + src_scan[1] + src_scan[-1]) / 3
-                      : (src_scan[0] + src_scan[1]) / 3;
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-              src_alpha1 = src_alpha1 * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha1));
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha1));
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha1));
-              dest_scan += Bpp;
-              src_scan += 3;
-            } else {
-              if (start_col > left) {
-                int src_alpha = src_scan[-1];
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-                src_alpha = src_alpha * a / 255;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              }
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-            for (int col = start_col + 1; col < end_col; col++) {
-              if (bNormal) {
-                int src_alpha1 = (src_scan[0] + src_scan[1] + src_scan[-1]) / 3;
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-                src_alpha1 = src_alpha1 * a / 255;
-                if (src_alpha1 == 0) {
-                  dest_scan += Bpp;
-                  src_scan += 3;
-                  continue;
-                }
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha1));
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha1));
-                dest_scan[0] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha1));
-                dest_scan += Bpp;
-                src_scan += 3;
-                continue;
-              }
-              int src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[1];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-          } else {
-            if (bNormal) {
-              int src_alpha1 =
-                  start_col > left
-                      ? (src_scan[0] + src_scan[-2] + src_scan[-1]) / 3
-                      : src_scan[0] / 3;
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-              src_alpha1 = src_alpha1 * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha1));
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha1));
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha1));
-              dest_scan += Bpp;
-              src_scan += 3;
-            } else {
-              if (start_col > left) {
-                int src_alpha = src_scan[-2];
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-                src_alpha = src_alpha * a / 255;
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-                src_alpha = src_scan[-1];
-                ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-                src_alpha = src_alpha * a / 255;
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              }
-              int src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-            for (int col = start_col + 1; col < end_col; col++) {
-              if (bNormal) {
-                int src_alpha1 = ((int)(src_scan[0]) + (int)(src_scan[-2]) +
-                                  (int)(src_scan[-1])) /
-                                 3;
-                ADJUST_ALPHA(dest_scan[2], r, src_alpha1, nativetext_flags, a);
-                src_alpha1 = src_alpha1 * a / 255;
-                if (src_alpha1 == 0) {
-                  dest_scan += Bpp;
-                  src_scan += 3;
-                  continue;
-                }
-                dest_scan[2] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha1));
-                dest_scan[1] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha1));
-                dest_scan[0] = FX_GAMMA_INVERSE(
-                    FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha1));
-                dest_scan += Bpp;
-                src_scan += 3;
-                continue;
-              }
-              int src_alpha = src_scan[-2];
-              ADJUST_ALPHA(dest_scan[2], r, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[2] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[2]), r, src_alpha));
-              src_alpha = src_scan[-1];
-              ADJUST_ALPHA(dest_scan[1], g, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[1] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[1]), g, src_alpha));
-              src_alpha = src_scan[0];
-              ADJUST_ALPHA(dest_scan[0], b, src_alpha, nativetext_flags, a);
-              src_alpha = src_alpha * a / 255;
-              dest_scan[0] = FX_GAMMA_INVERSE(
-                  FXDIB_ALPHA_MERGE(FX_GAMMA(dest_scan[0]), b, src_alpha));
-              dest_scan += Bpp;
-              src_scan += 3;
-            }
-          }
-        }
-      }
-    }
+
+    DrawNormalTextHelper(&bitmap, pGlyph, nrows, left, top, start_col, end_col,
+                         bNormal, bBGRStripe, x_subpixel, a, r, g, b);
   }
   if (bitmap.IsAlphaMask()) {
     SetBitMask(&bitmap, bmp_rect.left, bmp_rect.top, fill_color, alpha_flag,
@@ -1118,9 +659,10 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
   } else {
     SetDIBits(&bitmap, bmp_rect.left, bmp_rect.top);
   }
-  FX_Free(pGlyphAndPos);
+
   return TRUE;
 }
+
 FX_BOOL CFX_RenderDevice::DrawTextPath(int nChars,
                                        const FXTEXT_CHARPOS* pCharPos,
                                        CFX_Font* pFont,
diff --git a/core/fxge/include/fx_font.h b/core/fxge/include/fx_font.h
index 6bc9b2e4c2..762cdfaf87 100644
--- a/core/fxge/include/fx_font.h
+++ b/core/fxge/include/fx_font.h
@@ -528,8 +528,12 @@ struct FXTEXT_GLYPHPOS {
   FX_FLOAT m_fOriginY;
 };
 
-FX_RECT FXGE_GetGlyphsBBox(FXTEXT_GLYPHPOS* pGlyphAndPos,
-                           int nChars,
+void Color2Argb(FX_ARGB& argb,
+                uint32_t color,
+                int alpha_flag,
+                void* pIccTransform);
+
+FX_RECT FXGE_GetGlyphsBBox(const std::vector<FXTEXT_GLYPHPOS>& glyphs,
                            int anti_alias,
                            FX_FLOAT retinaScaleX = 1.0f,
                            FX_FLOAT retinaScaleY = 1.0f);
diff --git a/core/fxge/win32/fx_win32_device.cpp b/core/fxge/win32/fx_win32_device.cpp
index f8057e7d5d..3d96deb9e4 100644
--- a/core/fxge/win32/fx_win32_device.cpp
+++ b/core/fxge/win32/fx_win32_device.cpp
@@ -13,6 +13,7 @@
 #include "core/fxge/agg/fx_agg_driver.h"
 #include "core/fxge/dib/dib_int.h"
 #include "core/fxge/ge/fx_text_int.h"
+#include "core/fxge/include/fx_font.h"
 #include "core/fxge/include/fx_freetype.h"
 #include "core/fxge/include/fx_ge_win32.h"
 #include "core/fxge/win32/dwrite_int.h"
@@ -627,8 +628,7 @@ FX_BOOL CGdiDeviceDriver::GDI_StretchBitMask(const CFX_DIBitmap* pBitmap1,
   if (!pBitmap || dest_width == 0 || dest_height == 0) {
     return FALSE;
   }
-  _Color2Argb(bitmap_color, bitmap_color, alpha_flag | (1 << 24),
-              pIccTransform);
+  Color2Argb(bitmap_color, bitmap_color, alpha_flag | (1 << 24), pIccTransform);
   int width = pBitmap->GetWidth(), height = pBitmap->GetHeight();
   struct {
     BITMAPINFOHEADER bmiHeader;
@@ -855,8 +855,8 @@ FX_BOOL CGdiDeviceDriver::DrawPath(const CFX_PathData* pPathData,
   if (blend_type != FXDIB_BLEND_NORMAL) {
     return FALSE;
   }
-  _Color2Argb(fill_color, fill_color, alpha_flag | (1 << 24), pIccTransform);
-  _Color2Argb(stroke_color, stroke_color, alpha_flag, pIccTransform);
+  Color2Argb(fill_color, fill_color, alpha_flag | (1 << 24), pIccTransform);
+  Color2Argb(stroke_color, stroke_color, alpha_flag, pIccTransform);
   CWin32Platform* pPlatform =
       (CWin32Platform*)CFX_GEModule::Get()->GetPlatformData();
   if (!(pGraphState || stroke_color == 0) &&
@@ -963,7 +963,7 @@ FX_BOOL CGdiDeviceDriver::FillRect(const FX_RECT* pRect,
   if (blend_type != FXDIB_BLEND_NORMAL) {
     return FALSE;
   }
-  _Color2Argb(fill_color, fill_color, alpha_flag | (1 << 24), pIccTransform);
+  Color2Argb(fill_color, fill_color, alpha_flag | (1 << 24), pIccTransform);
   int alpha;
   FX_COLORREF rgb;
   ArgbDecode(fill_color, alpha, rgb);
@@ -1019,7 +1019,7 @@ FX_BOOL CGdiDeviceDriver::DrawCosmeticLine(FX_FLOAT x1,
   if (blend_type != FXDIB_BLEND_NORMAL) {
     return FALSE;
   }
-  _Color2Argb(color, color, alpha_flag | (1 << 24), pIccTransform);
+  Color2Argb(color, color, alpha_flag | (1 << 24), pIccTransform);
   int a;
   FX_COLORREF rgb;
   ArgbDecode(color, a, rgb);
diff --git a/core/fxge/win32/win32_int.h b/core/fxge/win32/win32_int.h
index 7916690817..619ac2fdae 100644
--- a/core/fxge/win32/win32_int.h
+++ b/core/fxge/win32/win32_int.h
@@ -361,9 +361,5 @@ class CPSPrinterDriver : public IFX_RenderDeviceDriver {
   CPSOutput* m_pPSOutput;
   CFX_PSRenderer m_PSRenderer;
 };
-void _Color2Argb(FX_ARGB& argb,
-                 uint32_t color,
-                 int alpha_flag,
-                 void* pIccTransform);
 
 #endif  // CORE_FXGE_WIN32_WIN32_INT_H_