mirror of
https://github.com/mpv-player/mpv
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27b512e1f5
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@28837 b3059339-0415-0410-9bf9-f77b7e298cf2
338 lines
8.1 KiB
C
338 lines
8.1 KiB
C
// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
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// vim:ts=8:sw=8:noet:ai:
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/*
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* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
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*
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* This file is part of libass.
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*
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* libass 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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*
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* libass 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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*
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* You should have received a copy of the GNU General Public License along
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* with libass; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <assert.h>
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#include <ft2build.h>
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#include FT_GLYPH_H
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#include "mputils.h"
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#include "ass_bitmap.h"
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struct ass_synth_priv_s {
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int tmp_w, tmp_h;
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unsigned short* tmp;
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int g_r;
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int g_w;
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unsigned *g;
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unsigned *gt2;
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double radius;
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};
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static const unsigned int maxcolor = 255;
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static const unsigned base = 256;
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static int generate_tables(ass_synth_priv_t* priv, double radius)
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{
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double A = log(1.0/base)/(radius*radius*2);
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int mx, i;
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double volume_diff, volume_factor = 0;
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unsigned volume;
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if (priv->radius == radius)
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return 0;
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else
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priv->radius = radius;
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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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if (priv->g_r) {
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priv->g = realloc(priv->g, priv->g_w * sizeof(unsigned));
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priv->gt2 = realloc(priv->gt2, 256 * priv->g_w * sizeof(unsigned));
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if (priv->g==NULL || priv->gt2==NULL) {
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return -1;
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}
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}
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if (priv->g_r) {
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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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volume=0;
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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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volume+= priv->g[i];
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}
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if(volume>256) volume_factor-= volume_diff;
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}
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volume=0;
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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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volume+= priv->g[i];
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}
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// gauss table:
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for(mx=0;mx<priv->g_w;mx++){
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for(i=0;i<256;i++){
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priv->gt2[mx+i*priv->g_w] = i*priv->g[mx];
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}
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}
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}
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return 0;
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}
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static void resize_tmp(ass_synth_priv_t* priv, int w, int h)
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{
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if (priv->tmp_w >= w && priv->tmp_h >= h)
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return;
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if (priv->tmp_w == 0)
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priv->tmp_w = 64;
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if (priv->tmp_h == 0)
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priv->tmp_h = 64;
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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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if (priv->tmp)
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free(priv->tmp);
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priv->tmp = malloc((priv->tmp_w + 1) * priv->tmp_h * sizeof(short));
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}
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ass_synth_priv_t* ass_synth_init(double radius)
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{
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ass_synth_priv_t* priv = calloc(1, sizeof(ass_synth_priv_t));
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generate_tables(priv, radius);
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return priv;
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}
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void ass_synth_done(ass_synth_priv_t* priv)
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{
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if (priv->tmp)
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free(priv->tmp);
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if (priv->g)
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free(priv->g);
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if (priv->gt2)
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free(priv->gt2);
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free(priv);
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}
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static bitmap_t* alloc_bitmap(int w, int h)
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{
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bitmap_t* bm;
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bm = calloc(1, sizeof(bitmap_t));
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bm->buffer = malloc(w*h);
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bm->w = w;
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bm->h = h;
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bm->left = bm->top = 0;
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return bm;
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}
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void ass_free_bitmap(bitmap_t* bm)
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{
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if (bm) {
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if (bm->buffer) free(bm->buffer);
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free(bm);
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}
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}
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static bitmap_t* copy_bitmap(const bitmap_t* src)
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{
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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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dst->top = src->top;
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memcpy(dst->buffer, src->buffer, src->w * src->h);
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return dst;
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}
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static int check_glyph_area(FT_Glyph glyph)
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{
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FT_BBox bbox;
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long long dx, dy;
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FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_TRUNCATE, &bbox);
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dx = bbox.xMax - bbox.xMin;
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dy = bbox.yMax - bbox.yMin;
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if (dx * dy > 8000000) {
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_GlyphBBoxTooLarge, (int)dx, (int)dy);
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return 1;
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} else
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return 0;
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}
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static bitmap_t* glyph_to_bitmap_internal(FT_Glyph glyph, int bord)
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{
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FT_BitmapGlyph bg;
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FT_Bitmap* bit;
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bitmap_t* bm;
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int w, h;
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unsigned char* src;
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unsigned char* dst;
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int i;
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int error;
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if (check_glyph_area(glyph))
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return 0;
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error = FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 0);
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if (error) {
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mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FT_Glyph_To_BitmapError, error);
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return 0;
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}
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bg = (FT_BitmapGlyph)glyph;
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bit = &(bg->bitmap);
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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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return 0;
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}
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w = bit->width;
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h = bit->rows;
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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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src = bit->buffer;
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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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memcpy(dst, src, w);
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src += bit->pitch;
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dst += bm->w;
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}
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FT_Done_Glyph(glyph);
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return bm;
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}
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/**
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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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*/
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static bitmap_t* fix_outline_and_shadow(bitmap_t* bm_g, bitmap_t* bm_o)
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{
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int x, y;
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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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c_g = g[x];
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c_o = o[x];
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o[x] = (c_o > c_g) ? c_o - (c_g/2) : 0;
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s[x] = (c_o < 0xFF - c_g) ? c_o + c_g : 0xFF;
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}
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g += bm_g->w;
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o += bm_o->w;
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s += bm_s->w;
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}
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assert(bm_s);
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return bm_s;
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}
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/**
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* \brief Blur with [[1,2,1]. [2,4,2], [1,2,1]] kernel
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* This blur is the same as the one employed by vsfilter.
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*/
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static void be_blur(unsigned char *buf, int w, int h) {
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unsigned int x, y;
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unsigned int old_sum, new_sum;
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for (y=0; y<h; y++) {
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old_sum = 2 * buf[y*w];
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for (x=0; x<w-1; x++) {
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new_sum = buf[y*w+x] + buf[y*w+x+1];
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buf[y*w+x] = (old_sum + new_sum) >> 2;
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old_sum = new_sum;
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}
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}
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for (x=0; x<w; x++) {
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old_sum = 2 * buf[x];
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for (y=0; y<h-1; y++) {
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new_sum = buf[y*w+x] + buf[(y+1)*w+x];
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buf[y*w+x] = (old_sum + new_sum) >> 2;
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old_sum = new_sum;
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}
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}
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}
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int glyph_to_bitmap(ass_synth_priv_t* priv_blur,
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FT_Glyph glyph, FT_Glyph outline_glyph, bitmap_t** bm_g,
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bitmap_t** bm_o, bitmap_t** bm_s, int be, double blur_radius)
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{
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int bord = be ? (be/4+1) : 0;
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blur_radius *= 2;
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bord = (blur_radius > 0.0) ? blur_radius : bord;
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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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if (glyph)
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*bm_g = glyph_to_bitmap_internal(glyph, bord);
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if (!*bm_g)
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return 1;
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if (outline_glyph) {
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*bm_o = glyph_to_bitmap_internal(outline_glyph, bord);
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if (!*bm_o) {
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ass_free_bitmap(*bm_g);
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return 1;
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}
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}
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if (*bm_o)
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resize_tmp(priv_blur, (*bm_o)->w, (*bm_o)->h);
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resize_tmp(priv_blur, (*bm_g)->w, (*bm_g)->h);
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if (be) {
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while (be--) {
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if (*bm_o)
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be_blur((*bm_o)->buffer, (*bm_o)->w, (*bm_o)->h);
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else
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be_blur((*bm_g)->buffer, (*bm_g)->w, (*bm_g)->h);
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}
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} else {
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if (blur_radius > 0.0) {
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generate_tables(priv_blur, blur_radius);
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if (*bm_o)
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blur((*bm_o)->buffer, priv_blur->tmp, (*bm_o)->w, (*bm_o)->h, (*bm_o)->w, (int*)priv_blur->gt2, priv_blur->g_r, priv_blur->g_w);
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else
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blur((*bm_g)->buffer, priv_blur->tmp, (*bm_g)->w, (*bm_g)->h, (*bm_g)->w, (int*)priv_blur->gt2, priv_blur->g_r, priv_blur->g_w);
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}
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}
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if (*bm_o)
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*bm_s = fix_outline_and_shadow(*bm_g, *bm_o);
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else
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*bm_s = copy_bitmap(*bm_g);
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assert(bm_s);
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return 0;
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}
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