Subtract instead of adding the negation.

core/fxge/ge/fx_ge_text.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <limits>
 
 #include "core/fxcodec/include/fx_codec.h"
 #include "core/fxge/ge/fx_text_int.h"
@@ skipping 1562 matching lines @@
       // sure |skew| != INT_MIN since -INT_MIN is undefined.
       if (skew <= 0 && skew != std::numeric_limits<int>::min() &&
           static_cast<size_t>(-skew) < ANGLESKEW_ARRAY_SIZE) {
         skew = -g_AngleSkew[-skew];
       } else {
         skew = -58;
       }
       if (pFont->IsVertical())
         ft_matrix.yx += ft_matrix.yy * skew / 100;
       else
-        ft_matrix.xy += -ft_matrix.xx * skew / 100;
+        ft_matrix.xy -= ft_matrix.xx * skew / 100;
     }
     if (pSubstFont->m_SubstFlags & FXFONT_SUBST_MM) {
       pFont->AdjustMMParams(glyph_index, dest_width,
                             pFont->GetSubstFont()->m_Weight);
     }
   }
   ScopedFontTransform scoped_transform(m_Face, &ft_matrix);
   int load_flags = (m_Face->face_flags & FT_FACE_FLAG_SFNT)
                        ? FXFT_LOAD_NO_BITMAP
                        : (FXFT_LOAD_NO_BITMAP | FT_LOAD_NO_HINTING);
@@ skipping 249 matching lines @@
       // sure |skew| != INT_MIN since -INT_MIN is undefined.
       if (skew <= 0 && skew != std::numeric_limits<int>::min() &&
           static_cast<size_t>(-skew) < ANGLESKEW_ARRAY_SIZE) {
         skew = -g_AngleSkew[-skew];
       } else {
         skew = -58;
       }
       if (m_bVertical)
         ft_matrix.yx += ft_matrix.yy * skew / 100;
       else
-        ft_matrix.xy += -ft_matrix.xx * skew / 100;
+        ft_matrix.xy -= ft_matrix.xx * skew / 100;
     }
     if (m_pSubstFont->m_SubstFlags & FXFONT_SUBST_MM) {
       AdjustMMParams(glyph_index, dest_width, m_pSubstFont->m_Weight);
     }
   }
   ScopedFontTransform scoped_transform(m_Face, &ft_matrix);
   int load_flags = FXFT_LOAD_NO_BITMAP;
   if (!(m_Face->face_flags & FT_FACE_FLAG_SFNT) || !FT_IS_TRICKY(m_Face)) {
     load_flags |= FT_LOAD_NO_HINTING;
   }
@@ skipping 43 matching lines @@
 void _CFX_UniqueKeyGen::Generate(int count, ...) {
   va_list argList;
   va_start(argList, count);
   for (int i = 0; i < count; i++) {
     int p = va_arg(argList, int);
     ((uint32_t*)m_Key)[i] = p;
   }
   va_end(argList);
   m_KeyLen = count * sizeof(uint32_t);
 }