/src/freetype/src/base/ftsynth.c
https://bitbucket.org/cabalistic/ogredeps/ · C · 160 lines · 73 code · 32 blank · 55 comment · 18 complexity · 17e264b807b479fd9a41af44ac08749e MD5 · raw file
- /***************************************************************************/
- /* */
- /* ftsynth.c */
- /* */
- /* FreeType synthesizing code for emboldening and slanting (body). */
- /* */
- /* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2010 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 = &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 = 0x06000L;
- transform.yy = 0x10000L;
- FT_Outline_Transform( outline, &transform );
- }
- /*************************************************************************/
- /*************************************************************************/
- /**** ****/
- /**** EXPERIMENTAL EMBOLDENING/OUTLINING SUPPORT ****/
- /**** ****/
- /*************************************************************************/
- /*************************************************************************/
- /* documentation is in ftsynth.h */
- FT_EXPORT_DEF( void )
- FT_GlyphSlot_Embolden( FT_GlyphSlot slot )
- {
- FT_Library library = slot->library;
- FT_Face face = slot->face;
- FT_Error error;
- FT_Pos xstr, ystr;
- 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 )
- {
- /* ignore error */
- (void)FT_Outline_Embolden( &slot->outline, xstr );
- /* this is more than enough for most glyphs; if you need accurate */
- /* values, you have to call FT_Outline_Get_CBox */
- xstr = xstr * 2;
- ystr = xstr;
- }
- 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.horiBearingY += ystr;
- slot->metrics.horiAdvance += xstr;
- slot->metrics.vertBearingX -= xstr / 2;
- slot->metrics.vertBearingY += ystr;
- slot->metrics.vertAdvance += 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 */