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#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <ft2build.h>
#include FT_GLYPH_H
#include "mp_msg.h"
#include "libvo/font_load.h" // for blur()
#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)
{
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* 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_GLOBAL, MSGL_WARN, "FT_Glyph_To_Bitmap error %d \n", error);
return 0;
}
bg = (FT_BitmapGlyph)glyph;
bit = &(bg->bitmap);
if (bit->pixel_mode != FT_PIXEL_MODE_GRAY) {
mp_msg(MSGT_GLOBAL, MSGL_WARN, "Unsupported pixel mode: %d\n", (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;
}
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);
assert(bm_g && bm_o);
if (glyph)
*bm_g = glyph_to_bitmap_internal(glyph, bord);
else
*bm_g = 0;
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;
}
} else
*bm_o = 0;
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)
fix_outline(*bm_g, *bm_o);
return 0;
}
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