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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  44  */
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <fcntl.h>
  48 #include <stdarg.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <sys/time.h>
  52 #include <X11/Xlib.h>
  53 #include <Imlib2.h>
  54
  55 #include "framehook.h"
  56
  57 typedef struct {
  58     int dummy;
  59     Imlib_Font fn;
  60     char *text;
  61     char *file;
  62     int r, g, b;
  63     int x;
  64     int y;
  65     struct _CachedImage *cache;
  66 } ContextInfo;
  67
  68 typedef struct _CachedImage {
  69     struct _CachedImage *next;
  70     Imlib_Image image;
  71     int width;
  72     int height;
  73 } CachedImage;
  74
  75
  76 int Configure(void **ctxp, int argc, char *argv[])
  77 {
  78     int c;
  79     ContextInfo *ci;
  80     char *font = "LucidaSansDemiBold/16";
  81     char *fp = getenv("FONTPATH");
  82     char *color = 0;
  83     FILE *f;
  84
  85     *ctxp = av_mallocz(sizeof(ContextInfo));
  86     ci = (ContextInfo *) *ctxp;
  87
  88     optind = 0;
  89
  90     if (fp)
  91         imlib_add_path_to_font_path(fp);
  92
  93     while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
  94         switch (c) {
  95             case 'c':
  96                 color = optarg;
  97                 break;
  98             case 'F':
  99                 font = optarg;
 100                 break;
 101             case 't':
 102                 ci->text = strdup(optarg);
 103                 break;
 104             case 'f':
 105                 ci->file = strdup(optarg);
 106                 break;
 107             case 'x':
 108                 ci->x = atoi(optarg);
 109                 break;
 110             case 'y':
 111                 ci->y = atoi(optarg);
 112                 break;
 113             case '?':
 114                 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
 115                 return -1;
 116         }
 117     }
 118
 119     ci->fn = imlib_load_font(font);
 120     if (!ci->fn) {
 121         fprintf(stderr, "Failed to load font '%s'\n", font);
 122         return -1;
 123     }
 124     imlib_context_set_font(ci->fn);
 125     imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
 126
 127     if (color) {
 128         char buff[256];
 129         int done = 0;
 130
 131         f = fopen("/usr/lib/X11/rgb.txt", "r");
 132         if (!f) {
 133             fprintf(stderr, "Failed to find rgb.txt\n");
 134             return -1;
 135         }
 136         while (fgets(buff, sizeof(buff), f)) {
 137             int r, g, b;
 138             char colname[80];
 139
 140             if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
 141                 strcasecmp(colname, color) == 0) {
 142                 ci->r = r;
 143                 ci->g = g;
 144                 ci->b = b;
 145                 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
 146                 done = 1;
 147                 break;
 148             }
 149         }
 150         fclose(f);
 151         if (!done) {
 152             fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
 153             return -1;
 154         }
 155     }
 156     imlib_context_set_color(ci->r, ci->g, ci->b, 255);
 157     return 0;
 158 }
 159
 160 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
 161 {
 162     CachedImage *cache;
 163
 164     for (cache = ci->cache; cache; cache = cache->next) {
 165         if (width == cache->width && height == cache->height)
 166             return cache->image;
 167     }
 168
 169     return NULL;
 170 }
 171
 172 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
 173 {
 174     CachedImage *cache = av_mallocz(sizeof(*cache));
 175
 176     cache->image = image;
 177     cache->width = width;
 178     cache->height = height;
 179     cache->next = ci->cache;
 180     ci->cache = cache;
 181 }
 182
 183 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
 184 {
 185     ContextInfo *ci = (ContextInfo *) ctx;
 186     AVPicture picture1;
 187     Imlib_Image image;
 188     DATA32 *data;
 189
 190     image = get_cached_image(ci, width, height);
 191
 192     if (!image) {
 193         image = imlib_create_image(width, height);
 194         put_cached_image(ci, image, width, height);
 195     }
 196
 197     imlib_context_set_image(image);
 198     data = imlib_image_get_data();
 199
 200     if (pix_fmt != PIX_FMT_BGRA32) {
 201         avpicture_fill(&picture1, (UINT8 *) data, PIX_FMT_BGRA32, width, height);
 202         if (img_convert(&picture1, PIX_FMT_BGRA32,
 203                         picture, pix_fmt, width, height) < 0) {
 204             goto done;
 205         }
 206     } else {
 207         av_abort();
 208     }
 209
 210     imlib_image_set_has_alpha(0);
 211
 212     {
 213         int wid, hig, h_a, v_a;
 214         char buff[1000];
 215         char tbuff[1000];
 216         char *tbp = ci->text;
 217         time_t now = time(0);
 218         char *p, *q;
 219         int x, y;
 220
 221         if (ci->file) {
 222             int fd = open(ci->file, O_RDONLY);
 223
 224             if (fd < 0) {
 225                 tbp = "[File not found]";
 226             } else {
 227                 int l = read(fd, tbuff, sizeof(tbuff) - 1);
 228
 229                 if (l >= 0) {
 230                     tbuff[l] = 0;
 231                     tbp = tbuff;
 232                 } else {
 233                     tbp = "[I/O Error]";
 234                 }
 235                 close(fd);
 236             }
 237         }
 238
 239         strftime(buff, sizeof(buff), tbp, localtime(&now));
 240
 241         x = ci->x;
 242         y = ci->y;
 243
 244         for (p = buff; p; p = q) {
 245             q = strchr(p, '\n');
 246             if (q)
 247                 *q++ = 0;
 248
 249             imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
 250             y += v_a;
 251         }
 252     }
 253
 254     if (pix_fmt != PIX_FMT_BGRA32) {
 255         if (img_convert(picture, pix_fmt,
 256                         &picture1, PIX_FMT_BGRA32, width, height) < 0) {
 257         }
 258     }
 259
 260 done:
 261     ;
 262 }
 263
 264 /* To ensure correct typing */
 265 FrameHookConfigureFn ConfigureFn = Configure;
 266 FrameHookProcessFn ProcessFn = Process;