* src/pshinter/pshalgo.c: slight modification to the Postscript hinter
to slightly increase the contrast of smooth hinting. This is very similar
to what the auto-hinter does when it comes to stem width computations.
However, it produces better results with well-hinted fonts..
This commit is contained in:
David Turner
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71afa750bf
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21
ChangeLog
21
ChangeLog
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@ -1,12 +1,19 @@
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2002-08-29 David Turner <david@freetype.org>
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* src/pshinter/pshalgo.c: slight modification to the Postscript hinter
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to slightly increase the contrast of smooth hinting. This is very similar
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to what the auto-hinter does when it comes to stem width computations.
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However, it produces better results with well-hinted fonts..
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2002-08-27 David Turner <david@freetype.org>
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* massive re-formatting changes to many, many source files. I don't
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want to list them all here. The operations performed were all logical
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transformations of the sources:
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- trying to convert all enums and constants to CAPITALIZED_STYLE, with
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#define definitions like
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#define my_old_constants MY_NEW_CONSTANT
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- big, big update of the documentation comments
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@ -14,7 +21,7 @@
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* include/freetype/freetype.h, src/base/ftobjs.c, src/smooth/ftsmooth.c,
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include/freetype/ftimage.h: adding support for LCD-optimized rendering
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though the new constants/enums:
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FT_RENDER_MODE_LCD, FT_RENDER_MODE_LCD_V
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FT_PIXEL_MODE_LCD, FT_PIXEL_MODE_LCD_V
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@ -23,12 +30,12 @@
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* adding new FT_LOAD_XXX flags, used to specify both hinting and rendering
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targets:
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FT_LOAD_TARGET_NORMAL :: anti-aliased hinting & rendering
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FT_LOAD_TARGET_MONO :: monochrome bitmaps
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FT_LOAD_TARGET_LCD :: horizontal RGB/BGR decimated hinting & rendering
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FT_LOAD_TARGET_LCD_V :: vertical RGB/BGR decimated hinting & rendering
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note that FT_LOAD_TARGET_NORMAL is 0, which means that the default
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behaviour of the font engine is _unchanged_.
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@ -185,7 +192,7 @@
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2002-08-15 Graham Asher <graham.asher@btinternet.com>
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Implemented the incremental font loading system for the CFF driver.
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Implemented the incremental font loading system for the CFF driver.
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Tested using the GhostScript-to-FreeType bridge (under development).
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* src/cff/cffgload.c (cff_get_glyph_data, cff_free_glyph_data): New
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@ -300,7 +307,7 @@
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2002-07-18 Graham Asher <graham.asher@btinternet.com>
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Added types and structures to support incremental typeface loading.
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Added types and structures to support incremental typeface loading.
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The FT_Incremental_Interface structure, defined in freetype.h, is
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designed to be passed to FT_Open_Face to provide callback functions
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to obtain glyph recipes and metrics, for fonts like those passed
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@ -33,10 +33,8 @@
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#endif
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#undef SNAP_STEMS
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#undef ONLY_ALIGN_Y
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#define COMPUTE_INFLEXS
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#define COMPUTE_INFLEXS /* compute inflection points to optimize "S" and others */
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#define STRONGER /* slightly increase the contrast of smooth hinting */
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/*************************************************************************/
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/*************************************************************************/
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@ -412,7 +410,7 @@
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/* perform stem snapping when requested */
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no_snapping = ( dimension == 0 && !glyph->no_horz_snapping ) ||
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( dimension == 1 && !glyph->no_vert_snapping );
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if ( !no_snapping )
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{
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/* compute fitted width/height */
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@ -499,6 +497,58 @@
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}
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else
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{
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#ifdef STRONGER
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if ( len <= 64 )
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{
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/* the stem is less than one pixel, we will center it */
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/* around the nearest pixel center */
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/* */
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pos = ( pos + (len >> 1) & -64 );
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len = 64;
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}
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else
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{
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FT_Pos delta = len - dim->stdw.widths[0].cur;
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if ( delta < 0 )
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delta = -delta;
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if ( delta < 40 )
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{
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len = dim->stdw.widths[0].cur;
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if ( len < 32 )
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len = 32;
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}
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if ( len < 3 * 64 )
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{
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delta = ( len & 63 );
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len &= -64;
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if ( delta < 10 )
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len += delta;
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else if ( delta < 32 )
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len += 10;
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else if ( delta < 54 )
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len += 54;
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else
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len += delta;
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}
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else
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len = ( len + 32 ) & -64;
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}
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/* now that we have a good hinted stem width, try to position */
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/* the stem along a pixel grid integer coordinate */
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hint->cur_pos = pos + psh3_hint_snap_stem_side_delta( pos, len );
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hint->cur_len = len;
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#else /* !STRONGER */
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/* Stems less than one pixel wide are easy - we want to
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* make them as dark as possible, so they must fall within
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* one pixel. If the stem is split between two pixels
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@ -541,7 +591,7 @@
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FT_Fixed delta_a, delta_b;
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if ( len & 64 )
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if ( len & 64 )
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{
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delta_a = ( center & -64 ) + 32 - center;
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delta_b = ( ( center + 32 ) & - 64 ) - center;
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@ -573,6 +623,7 @@
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pos += delta_b;
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}
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hint->cur_pos = pos;
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#endif /* !STRONGER */
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}
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}
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}
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@ -1712,7 +1763,7 @@
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glyph->no_horz_hints = 0;
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glyph->no_vert_hints = 0;
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glyph->no_horz_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_NORMAL ||
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hint_mode == FT_RENDER_MODE_LCD_V );
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