Update freetype sources (2.6.2) in third party.

third_party/freetype2/src/src/base/ftsynth.c

Index: third_party/freetype2/src/src/base/ftsynth.c
diff --git a/third_party/freetype2/src/src/base/ftsynth.c b/third_party/freetype2/src/src/base/ftsynth.c
new file mode 100644
index 0000000000000000000000000000000000000000..cd685339573fbdce70b5884b003da91d06918421
--- /dev/null
+++ b/third_party/freetype2/src/src/base/ftsynth.c
@@ -0,0 +1,163 @@
+/***************************************************************************/
+/*                                                                         */
+/*  ftsynth.c                                                              */
+/*                                                                         */
+/*    FreeType synthesizing code for emboldening and slanting (body).      */
+/*                                                                         */
+/*  Copyright 2000-2015 by                                                 */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used,       */
+/*  modified, and distributed under the terms of the FreeType project      */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_SYNTHESIS_H
+#include FT_INTERNAL_DEBUG_H
+#include FT_INTERNAL_OBJECTS_H
+#include FT_OUTLINE_H
+#include FT_BITMAP_H
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
+  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
+  /* messages during execution.                                            */
+  /*                                                                       */
+#undef  FT_COMPONENT
+#define FT_COMPONENT  trace_synth
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /****                                                                 ****/
+  /****   EXPERIMENTAL OBLIQUING SUPPORT                                ****/
+  /****                                                                 ****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+  /* documentation is in ftsynth.h */
+
+  FT_EXPORT_DEF( void )
+  FT_GlyphSlot_Oblique( FT_GlyphSlot  slot )
+  {
+    FT_Matrix    transform;
+    FT_Outline*  outline;
+
+
+    if ( !slot )
+      return;
+
+    outline = &slot->outline;
+
+    /* only oblique outline glyphs */
+    if ( slot->format != FT_GLYPH_FORMAT_OUTLINE )
+      return;
+
+    /* we don't touch the advance width */
+
+    /* For italic, simply apply a shear transform, with an angle */
+    /* of about 12 degrees.                                      */
+
+    transform.xx = 0x10000L;
+    transform.yx = 0x00000L;
+
+    transform.xy = 0x0366AL;
+    transform.yy = 0x10000L;
+
+    FT_Outline_Transform( outline, &transform );
+  }
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /****                                                                 ****/
+  /****   EXPERIMENTAL EMBOLDENING SUPPORT                              ****/
+  /****                                                                 ****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  /* documentation is in ftsynth.h */
+
+  FT_EXPORT_DEF( void )
+  FT_GlyphSlot_Embolden( FT_GlyphSlot  slot )
+  {
+    FT_Library  library;
+    FT_Face     face;
+    FT_Error    error;
+    FT_Pos      xstr, ystr;
+
+
+    if ( !slot )
+      return;
+
+    library = slot->library;
+    face    = slot->face;
+
+    if ( slot->format != FT_GLYPH_FORMAT_OUTLINE &&
+         slot->format != FT_GLYPH_FORMAT_BITMAP  )
+      return;
+
+    /* some reasonable strength */
+    xstr = FT_MulFix( face->units_per_EM,
+                      face->size->metrics.y_scale ) / 24;
+    ystr = xstr;
+
+    if ( slot->format == FT_GLYPH_FORMAT_OUTLINE )
+      FT_Outline_EmboldenXY( &slot->outline, xstr, ystr );
+
+    else /* slot->format == FT_GLYPH_FORMAT_BITMAP */
+    {
+      /* round to full pixels */
+      xstr &= ~63;
+      if ( xstr == 0 )
+        xstr = 1 << 6;
+      ystr &= ~63;
+
+      /*
+       * XXX: overflow check for 16-bit system, for compatibility
+       *      with FT_GlyphSlot_Embolden() since freetype-2.1.10.
+       *      unfortunately, this function return no informations
+       *      about the cause of error.
+       */
+      if ( ( ystr >> 6 ) > FT_INT_MAX || ( ystr >> 6 ) < FT_INT_MIN )
+      {
+        FT_TRACE1(( "FT_GlyphSlot_Embolden:" ));
+        FT_TRACE1(( "too strong embolding parameter ystr=%d\n", ystr ));
+        return;
+      }
+      error = FT_GlyphSlot_Own_Bitmap( slot );
+      if ( error )
+        return;
+
+      error = FT_Bitmap_Embolden( library, &slot->bitmap, xstr, ystr );
+      if ( error )
+        return;
+    }
+
+    if ( slot->advance.x )
+      slot->advance.x += xstr;
+
+    if ( slot->advance.y )
+      slot->advance.y += ystr;
+
+    slot->metrics.width        += xstr;
+    slot->metrics.height       += ystr;
+    slot->metrics.horiAdvance  += xstr;
+    slot->metrics.vertAdvance  += ystr;
+    slot->metrics.horiBearingY += ystr;
+
+    /* XXX: 16-bit overflow case must be excluded before here */
+    if ( slot->format == FT_GLYPH_FORMAT_BITMAP )
+      slot->bitmap_top += (FT_Int)( ystr >> 6 );
+  }
+
+
+/* END */