diff options
Diffstat (limited to 'pango/pangofc-font.c')
| -rw-r--r-- | pango/pangofc-font.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/pango/pangofc-font.c b/pango/pangofc-font.c index 18530ded..de43513d 100644 --- a/pango/pangofc-font.c +++ b/pango/pangofc-font.c @@ -26,6 +26,8 @@ #include "pango-modules.h" #include "pango-utils.h" +#include FT_TRUETYPE_TABLES_H + #define PANGO_SCALE_26_6 (PANGO_SCALE / (1<<6)) #define PANGO_PIXELS_26_6(d) \ (((d) >= 0) ? \ @@ -209,6 +211,28 @@ pango_fc_font_get_coverage (PangoFont *font, fcfont->font_pattern); } +static void +quantize_position (int *thickness, + int *position) +{ + int thickness_pixels = (*thickness + PANGO_SCALE / 2) / PANGO_SCALE; + if (thickness_pixels == 0) + thickness_pixels = 1; + + if (thickness_pixels & 1) + { + int new_center = ((*position - *thickness / 2) & ~(PANGO_SCALE - 1)) + PANGO_SCALE / 2; + *position = new_center + (PANGO_SCALE * thickness_pixels) / 2; + } + else + { + int new_center = ((*position - *thickness / 2 + PANGO_SCALE / 2) & ~(PANGO_SCALE - 1)); + *position = new_center + (PANGO_SCALE * thickness_pixels) / 2; + } + + *thickness = thickness_pixels * PANGO_SCALE; +} + /* For Xft, it would be slightly more efficient to simply to * call Xft, and also more robust against changes in Xft. * But for now, we simply use the same code for all backends. @@ -220,10 +244,16 @@ static void get_face_metrics (PangoFcFont *fcfont, PangoFontMetrics *metrics) { + FcBool hinting; FT_Face face = pango_fc_font_lock_face (fcfont); FcMatrix *fc_matrix; FT_Matrix ft_matrix; + TT_OS2 *os2; gboolean have_transform = FALSE; + + if (FcPatternGetBool (fcfont->font_pattern, + FC_HINTING, 0, &hinting) != FcResultMatch) + hinting = FcTrue; if (FcPatternGetMatrix (fcfont->font_pattern, FC_MATRIX, 0, &fc_matrix) == FcResultMatch) @@ -256,6 +286,51 @@ get_face_metrics (PangoFcFont *fcfont, metrics->descent = - PANGO_UNITS_26_6 (face->size->metrics.descender); metrics->ascent = PANGO_UNITS_26_6 (face->size->metrics.ascender); } + + /* Versions of FreeType < 2.1.8 get underline thickness wrong + * for Postscript fonts (always zero), so we need a fallback + */ + if (face->underline_thickness == 0) + { + metrics->underline_thickness = (PANGO_SCALE * face->size->metrics.y_ppem) / 14; + metrics->underline_position = - metrics->underline_thickness; + } + else + { + FT_Fixed ft_thickness, ft_position; + + ft_thickness = FT_MulFix (face->underline_thickness, face->size->metrics.y_scale); + metrics->underline_thickness = PANGO_UNITS_26_6 (ft_thickness); + + ft_position = FT_MulFix (face->underline_position, face->size->metrics.y_scale); + metrics->underline_position = PANGO_UNITS_26_6 (ft_position); + } + + os2 = FT_Get_Sfnt_Table (face, ft_sfnt_os2); + if (os2 && os2->version != 0xFFFF && os2->yStrikeoutSize != 0) + { + FT_Fixed ft_thickness, ft_position; + + ft_thickness = FT_MulFix (os2->yStrikeoutSize, face->size->metrics.y_scale); + metrics->strikethrough_thickness = PANGO_UNITS_26_6 (ft_thickness); + + ft_position = FT_MulFix (os2->yStrikeoutPosition, face->size->metrics.y_scale); + metrics->strikethrough_position = PANGO_UNITS_26_6 (ft_position); + } + else + { + metrics->strikethrough_thickness = metrics->underline_thickness; + metrics->strikethrough_position = (PANGO_SCALE * face->size->metrics.y_ppem) / 4; + } + + /* If hinting is on for this font, quantize the underline and strikethrough position + * to integer values. + */ + if (hinting) + { + quantize_position (&metrics->underline_thickness, &metrics->underline_position); + quantize_position (&metrics->strikethrough_thickness, &metrics->strikethrough_position); + } pango_fc_font_unlock_face (fcfont); } |