// -*- c-basic-offset: 8; indent-tabs-mode: t -*- // vim:ts=8:sw=8:noet:ai: /* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdlib.h> #include <string.h> #include <math.h> #include <assert.h> #include <ft2build.h> #include FT_GLYPH_H #include "mputils.h" #include "ass_bitmap.h" struct ass_synth_priv_s { int tmp_w, tmp_h; unsigned short* tmp; int g_r; int g_w; unsigned *g; unsigned *gt2; }; static const unsigned int maxcolor = 255; static const unsigned base = 256; static const double blur_radius = 1.5; static int generate_tables(ass_synth_priv_t* priv, double radius) { double A = log(1.0/base)/(radius*radius*2); int mx, i; double volume_diff, volume_factor = 0; unsigned volume; priv->g_r = ceil(radius); priv->g_w = 2*priv->g_r+1; if (priv->g_r) { priv->g = malloc(priv->g_w * sizeof(unsigned)); priv->gt2 = malloc(256 * priv->g_w * sizeof(unsigned)); if (priv->g==NULL || priv->gt2==NULL) { return -1; } } if (priv->g_r) { // gaussian curve with volume = 256 for (volume_diff=10000000; volume_diff>0.0000001; volume_diff*=0.5){ volume_factor+= volume_diff; volume=0; for (i = 0; i<priv->g_w; ++i) { priv->g[i] = (unsigned)(exp(A * (i-priv->g_r)*(i-priv->g_r)) * volume_factor + .5); volume+= priv->g[i]; } if(volume>256) volume_factor-= volume_diff; } volume=0; for (i = 0; i<priv->g_w; ++i) { priv->g[i] = (unsigned)(exp(A * (i-priv->g_r)*(i-priv->g_r)) * volume_factor + .5); volume+= priv->g[i]; } // gauss table: for(mx=0;mx<priv->g_w;mx++){ for(i=0;i<256;i++){ priv->gt2[mx+i*priv->g_w] = i*priv->g[mx]; } } } return 0; } static void resize_tmp(ass_synth_priv_t* priv, int w, int h) { if (priv->tmp_w >= w && priv->tmp_h >= h) return; if (priv->tmp_w == 0) priv->tmp_w = 64; if (priv->tmp_h == 0) priv->tmp_h = 64; while (priv->tmp_w < w) priv->tmp_w *= 2; while (priv->tmp_h < h) priv->tmp_h *= 2; if (priv->tmp) free(priv->tmp); priv->tmp = malloc((priv->tmp_w + 1) * priv->tmp_h * sizeof(short)); } ass_synth_priv_t* ass_synth_init() { ass_synth_priv_t* priv = calloc(1, sizeof(ass_synth_priv_t)); generate_tables(priv, blur_radius); return priv; } void ass_synth_done(ass_synth_priv_t* priv) { if (priv->tmp) free(priv->tmp); if (priv->g) free(priv->g); if (priv->gt2) free(priv->gt2); free(priv); } static bitmap_t* alloc_bitmap(int w, int h) { bitmap_t* bm; bm = calloc(1, sizeof(bitmap_t)); bm->buffer = malloc(w*h); bm->w = w; bm->h = h; bm->left = bm->top = 0; return bm; } void ass_free_bitmap(bitmap_t* bm) { if (bm) { if (bm->buffer) free(bm->buffer); free(bm); } } static bitmap_t* copy_bitmap(const bitmap_t* src) { bitmap_t* dst = alloc_bitmap(src->w, src->h); dst->left = src->left; dst->top = src->top; memcpy(dst->buffer, src->buffer, src->w * src->h); return dst; } static bitmap_t* glyph_to_bitmap_internal(FT_Glyph glyph, int bord) { FT_BitmapGlyph bg; FT_Bitmap* bit; bitmap_t* bm; int w, h; unsigned char* src; unsigned char* dst; int i; int error; error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 0); if (error) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_To_BitmapError, error); return 0; } bg = (FT_BitmapGlyph)glyph; bit = &(bg->bitmap); if (bit->pixel_mode != FT_PIXEL_MODE_GRAY) { mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_UnsupportedPixelMode, (int)(bit->pixel_mode)); FT_Done_Glyph(glyph); return 0; } w = bit->width; h = bit->rows; bm = alloc_bitmap(w + 2*bord, h + 2*bord); memset(bm->buffer, 0, bm->w * bm->h); bm->left = bg->left - bord; bm->top = - bg->top - bord; src = bit->buffer; dst = bm->buffer + bord + bm->w * bord; for (i = 0; i < h; ++i) { memcpy(dst, src, w); src += bit->pitch; dst += bm->w; } return bm; } /** * \brief fix outline bitmap and generate shadow bitmap * Two things are done here: * 1. Glyph bitmap is subtracted from outline bitmap. This way looks much better in some cases. * 2. Shadow bitmap is created as a sum of glyph and outline bitmaps. */ static bitmap_t* fix_outline_and_shadow(bitmap_t* bm_g, bitmap_t* bm_o) { int x, y; const int l = bm_o->left > bm_g->left ? bm_o->left : bm_g->left; const int t = bm_o->top > bm_g->top ? bm_o->top : bm_g->top; 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; 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; bitmap_t* bm_s = copy_bitmap(bm_o); unsigned char* g = bm_g->buffer + (t - bm_g->top) * bm_g->w + (l - bm_g->left); unsigned char* o = bm_o->buffer + (t - bm_o->top) * bm_o->w + (l - bm_o->left); unsigned char* s = bm_s->buffer + (t - bm_s->top) * bm_s->w + (l - bm_s->left); for (y = 0; y < b - t; ++y) { for (x = 0; x < r - l; ++x) { unsigned char c_g, c_o; c_g = g[x]; c_o = o[x]; o[x] = (c_o > c_g) ? c_o : 0; s[x] = (c_o < 0xFF - c_g) ? c_o + c_g : 0xFF; } g += bm_g->w; o += bm_o->w; s += bm_s->w; } assert(bm_s); return bm_s; } int glyph_to_bitmap(ass_synth_priv_t* priv, FT_Glyph glyph, FT_Glyph outline_glyph, bitmap_t** bm_g, bitmap_t** bm_o, bitmap_t** bm_s, int be) { const int bord = be ? ceil(blur_radius) : 0; assert(bm_g && bm_o && bm_s); *bm_g = *bm_o = *bm_s = 0; if (glyph) *bm_g = glyph_to_bitmap_internal(glyph, bord); if (!*bm_g) return 1; if (outline_glyph) { *bm_o = glyph_to_bitmap_internal(outline_glyph, bord); if (!*bm_o) { ass_free_bitmap(*bm_g); return 1; } } if (*bm_o) resize_tmp(priv, (*bm_o)->w, (*bm_o)->h); resize_tmp(priv, (*bm_g)->w, (*bm_g)->h); if (be) { blur((*bm_g)->buffer, priv->tmp, (*bm_g)->w, (*bm_g)->h, (*bm_g)->w, (int*)priv->gt2, priv->g_r, priv->g_w); if (*bm_o) 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) *bm_s = fix_outline_and_shadow(*bm_g, *bm_o); else *bm_s = copy_bitmap(*bm_g); assert(bm_s); return 0; }