diff options
Diffstat (limited to 'libass/ass_font.c')
-rw-r--r-- | libass/ass_font.c | 31 |
1 files changed, 26 insertions, 5 deletions
diff --git a/libass/ass_font.c b/libass/ass_font.c index 40060876e6..0d38a7604c 100644 --- a/libass/ass_font.c +++ b/libass/ass_font.c @@ -25,6 +25,7 @@ #include FT_FREETYPE_H #include FT_SYNTHESIS_H #include FT_GLYPH_H +#include FT_TRUETYPE_TABLES_H #include "ass.h" #include "ass_library.h" @@ -67,9 +68,8 @@ static void update_transform(ass_font_t* font) { int i; FT_Matrix m; - double size_scale = font->size / (int)font->size; - m.xx = double_to_d16(font->scale_x * size_scale); - m.yy = double_to_d16(font->scale_y * size_scale); + m.xx = double_to_d16(font->scale_x); + m.yy = double_to_d16(font->scale_y); m.xy = m.yx = 0; for (i = 0; i < font->n_faces; ++i) FT_Set_Transform(font->faces[i], &m, &font->v); @@ -154,6 +154,28 @@ void ass_font_set_transform(ass_font_t* font, double scale_x, double scale_y, FT update_transform(font); } +static void face_set_size(FT_Face face, double size) +{ + TT_HoriHeader *hori = FT_Get_Sfnt_Table(face, ft_sfnt_hhea); + TT_OS2 *os2 = FT_Get_Sfnt_Table(face, ft_sfnt_os2); + double mscale = 1.; + FT_Size_RequestRec rq; + FT_Size_Metrics *m = &face->size->metrics; + // VSFilter uses metrics from TrueType OS/2 table + // The idea was borrowed from asa (http://asa.diac24.net) + if (hori && os2) + mscale = ((double)(hori->Ascender - hori->Descender)) / (os2->usWinAscent + os2->usWinDescent); + memset(&rq, 0, sizeof(rq)); + rq.type = FT_SIZE_REQUEST_TYPE_REAL_DIM; + rq.width = 0; + rq.height = double_to_d6(size * mscale); + rq.horiResolution = rq.vertResolution = 0; + FT_Request_Size(face, &rq); + m->ascender /= mscale; + m->descender /= mscale; + m->height /= mscale; +} + /** * \brief Set font size **/ @@ -163,8 +185,7 @@ void ass_font_set_size(ass_font_t* font, double size) if (font->size != size) { font->size = size; for (i = 0; i < font->n_faces; ++i) - FT_Set_Pixel_Sizes(font->faces[i], 0, (int)size); - update_transform(font); + face_set_size(font->faces[i], size); } } |