vhook/imlib2.c

   1 /*
   2  * imlib2 based hook
   3  * Copyright (c) 2002 Philip Gladstone
   4  *
   5  * This module implements a text overlay for a video image. Currently it
   6  * supports a fixed overlay or reading the text from a file. The string
   7  * is passed through strftime so that it is easy to imprint the date and
   8  * time onto the image.
   9  *
  10  * Options:
  11  *
  12  * -c <color>           The color of the text
  13  * -F <fontname>        The font face and size
  14  * -t <text>            The text
  15  * -f <filename>        The filename to read text from
  16  * -x <num>             X coordinate to start text
  17  * -y <num>             Y coordinate to start text
  18  *
  19  * This module is very much intended as an example of what could be done.
  20  * For example, you could overlay an image (even semi-transparent) like
  21  * TV stations do. You can manipulate the image using imlib2 functions
  22  * in any way.
  23  *
  24  * One caution is that this is an expensive process -- in particular the
  25  * conversion of the image into RGB and back is time consuming. For some
  26  * special cases -- e.g. painting black text -- it would be faster to paint
  27  * the text into a bitmap and then combine it directly into the YUV
  28  * image. However, this code is fast enough to handle 10 fps of 320x240 on a
  29  * 900MHz Duron in maybe 15% of the CPU.
  30  *
  31  * This library is free software; you can redistribute it and/or
  32  * modify it under the terms of the GNU Lesser General Public
  33  * License as published by the Free Software Foundation; either
  34  * version 2 of the License, or (at your option) any later version.
  35  *
  36  * This library is distributed in the hope that it will be useful,
  37  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  38  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  39  * Lesser General Public License for more details.
  40  *
  41  * You should have received a copy of the GNU Lesser General Public
  42  * License along with this library; if not, write to the Free Software
  43  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  44  */
  45
  46 #include "framehook.h"
  47
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <fcntl.h>
  51 #include <stdarg.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #undef time
  55 #include <sys/time.h>
  56 #include <time.h>
  57 #include <X11/Xlib.h>
  58 #include <Imlib2.h>
  59
  60 typedef struct {
  61     int dummy;
  62     Imlib_Font fn;
  63     char *text;
  64     char *file;
  65     int r, g, b;
  66     int x;
  67     int y;
  68     struct _CachedImage *cache;
  69 } ContextInfo;
  70
  71 typedef struct _CachedImage {
  72     struct _CachedImage *next;
  73     Imlib_Image image;
  74     int width;
  75     int height;
  76 } CachedImage;
  77
  78 void Release(void *ctx)
  79 {
  80     ContextInfo *ci;
  81     ci = (ContextInfo *) ctx;
  82
  83     if (ci->cache) {
  84         imlib_context_set_image(ci->cache->image);
  85         imlib_free_image();
  86         av_free(ci->cache);
  87     }
  88     if (ctx)
  89         av_free(ctx);
  90 }
  91
  92 int Configure(void **ctxp, int argc, char *argv[])
  93 {
  94     int c;
  95     ContextInfo *ci;
  96     char *font = "LucidaSansDemiBold/16";
  97     char *fp = getenv("FONTPATH");
  98     char *color = 0;
  99     FILE *f;
 100
 101     *ctxp = av_mallocz(sizeof(ContextInfo));
 102     ci = (ContextInfo *) *ctxp;
 103
 104     optind = 0;
 105
 106     if (fp)
 107         imlib_add_path_to_font_path(fp);
 108
 109     while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
 110         switch (c) {
 111             case 'c':
 112                 color = optarg;
 113                 break;
 114             case 'F':
 115                 font = optarg;
 116                 break;
 117             case 't':
 118                 ci->text = av_strdup(optarg);
 119                 break;
 120             case 'f':
 121                 ci->file = av_strdup(optarg);
 122                 break;
 123             case 'x':
 124                 ci->x = atoi(optarg);
 125                 break;
 126             case 'y':
 127                 ci->y = atoi(optarg);
 128                 break;
 129             case '?':
 130                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 131                 return -1;
 132         }
 133     }
 134
 135     ci->fn = imlib_load_font(font);
 136     if (!ci->fn) {
 137         fprintf(stderr, "Failed to load font '%s'\n", font);
 138         return -1;
 139     }
 140     imlib_context_set_font(ci->fn);
 141     imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
 142
 143     if (color) {
 144         char buff[256];
 145         int done = 0;
 146
 147         f = fopen("/usr/share/X11/rgb.txt", "r");
 148         if (!f)
 149             f = fopen("/usr/lib/X11/rgb.txt", "r");
 150         if (!f) {
 151             fprintf(stderr, "Failed to find rgb.txt\n");
 152             return -1;
 153         }
 154         while (fgets(buff, sizeof(buff), f)) {
 155             int r, g, b;
 156             char colname[80];
 157
 158             if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
 159                 strcasecmp(colname, color) == 0) {
 160                 ci->r = r;
 161                 ci->g = g;
 162                 ci->b = b;
 163                 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
 164                 done = 1;
 165                 break;
 166             }
 167         }
 168         fclose(f);
 169         if (!done) {
 170             fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
 171             return -1;
 172         }
 173     }
 174     imlib_context_set_color(ci->r, ci->g, ci->b, 255);
 175     return 0;
 176 }
 177
 178 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
 179 {
 180     CachedImage *cache;
 181
 182     for (cache = ci->cache; cache; cache = cache->next) {
 183         if (width == cache->width && height == cache->height)
 184             return cache->image;
 185     }
 186
 187     return NULL;
 188 }
 189
 190 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
 191 {
 192     CachedImage *cache = av_mallocz(sizeof(*cache));
 193
 194     cache->image = image;
 195     cache->width = width;
 196     cache->height = height;
 197     cache->next = ci->cache;
 198     ci->cache = cache;
 199 }
 200
 201 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, int64_t pts)
 202 {
 203     ContextInfo *ci = (ContextInfo *) ctx;
 204     AVPicture picture1;
 205     Imlib_Image image;
 206     DATA32 *data;
 207
 208     image = get_cached_image(ci, width, height);
 209
 210     if (!image) {
 211         image = imlib_create_image(width, height);
 212         put_cached_image(ci, image, width, height);
 213     }
 214
 215     imlib_context_set_image(image);
 216     data = imlib_image_get_data();
 217
 218         avpicture_fill(&picture1, (uint8_t *) data, PIX_FMT_RGBA32, width, height);
 219     if (pix_fmt != PIX_FMT_RGBA32) {
 220         if (img_convert(&picture1, PIX_FMT_RGBA32,
 221                         picture, pix_fmt, width, height) < 0) {
 222             goto done;
 223         }
 224     } else {
 225         img_copy(&picture1, picture, PIX_FMT_RGBA32, width, height);
 226     }
 227
 228     imlib_image_set_has_alpha(0);
 229
 230     {
 231         int wid, hig, h_a, v_a;
 232         char buff[1000];
 233         char tbuff[1000];
 234         char *tbp = ci->text;
 235         time_t now = time(0);
 236         char *p, *q;
 237         int x, y;
 238
 239         if (ci->file) {
 240             int fd = open(ci->file, O_RDONLY);
 241
 242             if (fd < 0) {
 243                 tbp = "[File not found]";
 244             } else {
 245                 int l = read(fd, tbuff, sizeof(tbuff) - 1);
 246
 247                 if (l >= 0) {
 248                     tbuff[l] = 0;
 249                     tbp = tbuff;
 250                 } else {
 251                     tbp = "[I/O Error]";
 252                 }
 253                 close(fd);
 254             }
 255         }
 256
 257         strftime(buff, sizeof(buff), tbp ? tbp : "[No data]", localtime(&now));
 258
 259         x = ci->x;
 260         y = ci->y;
 261
 262         for (p = buff; p; p = q) {
 263             q = strchr(p, '\n');
 264             if (q)
 265                 *q++ = 0;
 266
 267             imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
 268             y += v_a;
 269         }
 270     }
 271
 272     if (pix_fmt != PIX_FMT_RGBA32) {
 273         if (img_convert(picture, pix_fmt,
 274                         &picture1, PIX_FMT_RGBA32, width, height) < 0) {
 275         }
 276     } else {
 277         img_copy(picture, &picture1, PIX_FMT_RGBA32, width, height);
 278     }
 279
 280 done:
 281     ;
 282 }
 283