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// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
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// vim:ts=8:sw=8:noet:ai:
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Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include "ass_bitmap.h"
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struct ass_synth_priv_s {
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static const unsigned int maxcolor = 255;
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static const unsigned base = 256;
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static const double blur_radius = 1.5;
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static int generate_tables(ass_synth_priv_t* priv, double radius)
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double A = log(1.0/base)/(radius*radius*2);
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double volume_diff, volume_factor = 0;
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priv->g_r = ceil(radius);
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priv->g_w = 2*priv->g_r+1;
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priv->g = malloc(priv->g_w * sizeof(unsigned));
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priv->gt2 = malloc(256 * priv->g_w * sizeof(unsigned));
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if (priv->g==NULL || priv->gt2==NULL) {
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// gaussian curve with volume = 256
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for (volume_diff=10000000; volume_diff>0.0000001; volume_diff*=0.5){
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volume_factor+= volume_diff;
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for (i = 0; i<priv->g_w; ++i) {
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priv->g[i] = (unsigned)(exp(A * (i-priv->g_r)*(i-priv->g_r)) * volume_factor + .5);
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if(volume>256) volume_factor-= volume_diff;
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for (i = 0; i<priv->g_w; ++i) {
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priv->g[i] = (unsigned)(exp(A * (i-priv->g_r)*(i-priv->g_r)) * volume_factor + .5);
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for(mx=0;mx<priv->g_w;mx++){
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priv->gt2[mx+i*priv->g_w] = i*priv->g[mx];
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static void resize_tmp(ass_synth_priv_t* priv, int w, int h)
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if (priv->tmp_w >= w && priv->tmp_h >= h)
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while (priv->tmp_w < w) priv->tmp_w *= 2;
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while (priv->tmp_h < h) priv->tmp_h *= 2;
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priv->tmp = malloc((priv->tmp_w + 1) * priv->tmp_h * sizeof(short));
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ass_synth_priv_t* ass_synth_init(void)
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ass_synth_priv_t* priv = calloc(1, sizeof(ass_synth_priv_t));
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generate_tables(priv, blur_radius);
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void ass_synth_done(ass_synth_priv_t* priv)
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static bitmap_t* alloc_bitmap(int w, int h)
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bm = calloc(1, sizeof(bitmap_t));
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bm->buffer = malloc(w*h);
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bm->left = bm->top = 0;
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void ass_free_bitmap(bitmap_t* bm)
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if (bm->buffer) free(bm->buffer);
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static bitmap_t* copy_bitmap(const bitmap_t* src)
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bitmap_t* dst = alloc_bitmap(src->w, src->h);
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dst->left = src->left;
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memcpy(dst->buffer, src->buffer, src->w * src->h);
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static bitmap_t* glyph_to_bitmap_internal(FT_Glyph glyph, int bord)
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error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 0);
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_To_BitmapError, error);
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bg = (FT_BitmapGlyph)glyph;
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if (bit->pixel_mode != FT_PIXEL_MODE_GRAY) {
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_UnsupportedPixelMode, (int)(bit->pixel_mode));
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FT_Done_Glyph(glyph);
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bm = alloc_bitmap(w + 2*bord, h + 2*bord);
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memset(bm->buffer, 0, bm->w * bm->h);
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bm->left = bg->left - bord;
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bm->top = - bg->top - bord;
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dst = bm->buffer + bord + bm->w * bord;
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for (i = 0; i < h; ++i) {
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* \brief fix outline bitmap and generate shadow bitmap
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* Two things are done here:
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* 1. Glyph bitmap is subtracted from outline bitmap. This way looks much better in some cases.
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* 2. Shadow bitmap is created as a sum of glyph and outline bitmaps.
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static bitmap_t* fix_outline_and_shadow(bitmap_t* bm_g, bitmap_t* bm_o)
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const int l = bm_o->left > bm_g->left ? bm_o->left : bm_g->left;
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const int t = bm_o->top > bm_g->top ? bm_o->top : bm_g->top;
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const int r = bm_o->left + bm_o->w < bm_g->left + bm_g->w ? bm_o->left + bm_o->w : bm_g->left + bm_g->w;
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const int b = bm_o->top + bm_o->h < bm_g->top + bm_g->h ? bm_o->top + bm_o->h : bm_g->top + bm_g->h;
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bitmap_t* bm_s = copy_bitmap(bm_o);
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unsigned char* g = bm_g->buffer + (t - bm_g->top) * bm_g->w + (l - bm_g->left);
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unsigned char* o = bm_o->buffer + (t - bm_o->top) * bm_o->w + (l - bm_o->left);
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unsigned char* s = bm_s->buffer + (t - bm_s->top) * bm_s->w + (l - bm_s->left);
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for (y = 0; y < b - t; ++y) {
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for (x = 0; x < r - l; ++x) {
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unsigned char c_g, c_o;
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o[x] = (c_o > c_g) ? c_o : 0;
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s[x] = (c_o < 0xFF - c_g) ? c_o + c_g : 0xFF;
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int glyph_to_bitmap(ass_synth_priv_t* priv, FT_Glyph glyph, FT_Glyph outline_glyph,
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bitmap_t** bm_g, bitmap_t** bm_o, bitmap_t** bm_s, int be)
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const int bord = be ? ceil(blur_radius) : 0;
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assert(bm_g && bm_o && bm_s);
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*bm_g = *bm_o = *bm_s = 0;
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*bm_g = glyph_to_bitmap_internal(glyph, bord);
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*bm_o = glyph_to_bitmap_internal(outline_glyph, bord);
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ass_free_bitmap(*bm_g);
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resize_tmp(priv, (*bm_o)->w, (*bm_o)->h);
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resize_tmp(priv, (*bm_g)->w, (*bm_g)->h);
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blur((*bm_g)->buffer, priv->tmp, (*bm_g)->w, (*bm_g)->h, (*bm_g)->w, (int*)priv->gt2, priv->g_r, priv->g_w);
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blur((*bm_o)->buffer, priv->tmp, (*bm_o)->w, (*bm_o)->h, (*bm_o)->w, (int*)priv->gt2, priv->g_r, priv->g_w);
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*bm_s = fix_outline_and_shadow(*bm_g, *bm_o);
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*bm_s = copy_bitmap(*bm_g);