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mpv
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Subtract glyph bitmap from outline bitmap. 

It greatly improves display of glyphs with semitransparent primary color.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19862 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
eugeni 2006-09-16 19:01:56 +00:00
parent 565cfd4200
commit 5cdc829b9f
1 changed files with 22 additions and 0 deletions
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22
libass/ass_bitmap.c
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@ -159,6 +159,25 @@ static bitmap_t* glyph_to_bitmap_internal(FT_Glyph glyph, int bord)
return bm;
}
static void fix_outline(bitmap_t* bm_g, bitmap_t* bm_o)
{
int x, y;
int sx = bm_g->left - bm_o->left;
int sy = bm_g->top - bm_o->top;
if (sx < 0 || sy < 0) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "fix_outline failed \n");
return;
}
for (y = 0; y < bm_g->h; ++y)
for (x = 0; x < bm_g->w; ++x) {
unsigned char c_g, c_o;
c_o = bm_o->buffer[(y + sy) * bm_o->w + (x + sx)];
c_g = bm_g->buffer[y * bm_g->w + x];
bm_o->buffer[(y + sy) * bm_o->w + (x + sx)] = (c_o > c_g) ? c_o - c_g : 0;
}
}
int glyph_to_bitmap(ass_synth_priv_t* priv, FT_Glyph glyph, FT_Glyph outline_glyph, bitmap_t** bm_g, bitmap_t** bm_o, int be)
{
const int bord = ceil(blur_radius);
@ -187,6 +206,9 @@ int glyph_to_bitmap(ass_synth_priv_t* priv, FT_Glyph glyph, FT_Glyph outline_gly
blur((*bm_o)->buffer, priv->tmp, (*bm_o)->w, (*bm_o)->h, (*bm_o)->w, (int*)priv->gt2, priv->g_r, priv->g_w);
}
if (bm_o)
fix_outline(*bm_g, *bm_o);
return 0;
}