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Correct font size in libass. 

Values from TrueType OS/2 table are used to reproduce VSFilter behaviour.
Magic 0.8 multiplier and scaling for the fractional part of font size are not
needed anymore.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23346 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
eugeni 2007-05-19 14:11:41 +00:00
parent b8b8271170
commit 1762cbe986
3 changed files with 28 additions and 10 deletions
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31
libass/ass_font.c
View File

@ -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);
}
}

3
libass/ass_mp.c
View File

@ -67,7 +67,6 @@ extern char* sub_cp;
static char* sub_cp = 0;
#endif
extern double ass_internal_font_size_coeff;
extern void process_force_style(ass_track_t* track);
ass_track_t* ass_default_track(ass_library_t* library) {
@ -92,7 +91,7 @@ ass_track_t* ass_default_track(ass_library_t* library) {
style->Name = strdup("Default");
style->FontName = (font_fontconfig && font_name) ? strdup(font_name) : strdup("Sans");
fs = track->PlayResY * text_font_scale_factor / 100. / ass_internal_font_size_coeff;
fs = track->PlayResY * text_font_scale_factor / 100.;
// approximate autoscale coefficients
if (subtitle_autoscale == 2)
fs *= 1.3;

4
libass/ass_render.c
View File

@ -506,8 +506,6 @@ static inline int mystrcmp(char** p, const char* sample) {
return 0;
}
double ass_internal_font_size_coeff = 0.8;
static void change_font_size(double sz)
{
double size = sz * frame_context.font_scale;
@ -2103,7 +2101,7 @@ static int ass_start_frame(ass_renderer_t *priv, ass_track_t* track, long long n
ass_lazy_track_init();
frame_context.font_scale = global_settings->font_size_coeff * ass_internal_font_size_coeff *
frame_context.font_scale = global_settings->font_size_coeff *
frame_context.orig_height / frame_context.track->PlayResY;
frame_context.border_scale = ((double)frame_context.orig_height) / frame_context.track->PlayResY;