3 * Copyright (c) 2002 Philip Gladstone
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
12 * -c <color> The color of the text
13 * -F <fontname> The font face and size
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
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
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.
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.
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.
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
56 #include "framehook.h"
66 struct _CachedImage *cache;
69 typedef struct _CachedImage {
70 struct _CachedImage *next;
77 int Configure(void **ctxp, int argc, char *argv[])
81 char *font = "LucidaSansDemiBold/16";
82 char *fp = getenv("FONTPATH");
86 *ctxp = av_mallocz(sizeof(ContextInfo));
87 ci = (ContextInfo *) *ctxp;
92 imlib_add_path_to_font_path(fp);
94 while ((c = getopt(argc, argv, "c:f:F:t:x:y:")) > 0) {
103 ci->text = strdup(optarg);
106 ci->file = strdup(optarg);
109 ci->x = atoi(optarg);
112 ci->y = atoi(optarg);
115 fprintf(stderr, "Unrecognized argument '%s'\n", argv[optind]);
120 ci->fn = imlib_load_font(font);
122 fprintf(stderr, "Failed to load font '%s'\n", font);
125 imlib_context_set_font(ci->fn);
126 imlib_context_set_direction(IMLIB_TEXT_TO_RIGHT);
132 f = fopen("/usr/lib/X11/rgb.txt", "r");
134 fprintf(stderr, "Failed to find rgb.txt\n");
137 while (fgets(buff, sizeof(buff), f)) {
141 if (sscanf(buff, "%d %d %d %64s", &r, &g, &b, colname) == 4 &&
142 strcasecmp(colname, color) == 0) {
146 /* fprintf(stderr, "%s -> %d,%d,%d\n", colname, r, g, b); */
153 fprintf(stderr, "Unable to find color '%s' in rgb.txt\n", color);
157 imlib_context_set_color(ci->r, ci->g, ci->b, 255);
161 static Imlib_Image get_cached_image(ContextInfo *ci, int width, int height)
165 for (cache = ci->cache; cache; cache = cache->next) {
166 if (width == cache->width && height == cache->height)
173 static void put_cached_image(ContextInfo *ci, Imlib_Image image, int width, int height)
175 CachedImage *cache = av_mallocz(sizeof(*cache));
177 cache->image = image;
178 cache->width = width;
179 cache->height = height;
180 cache->next = ci->cache;
184 void Process(void *ctx, AVPicture *picture, enum PixelFormat pix_fmt, int width, int height, INT64 pts)
186 ContextInfo *ci = (ContextInfo *) ctx;
191 image = get_cached_image(ci, width, height);
194 image = imlib_create_image(width, height);
195 put_cached_image(ci, image, width, height);
198 imlib_context_set_image(image);
199 data = imlib_image_get_data();
201 if (pix_fmt != PIX_FMT_BGRA32) {
202 avpicture_fill(&picture1, (UINT8 *) data, PIX_FMT_BGRA32, width, height);
203 if (img_convert(&picture1, PIX_FMT_BGRA32,
204 picture, pix_fmt, width, height) < 0) {
211 imlib_image_set_has_alpha(0);
214 int wid, hig, h_a, v_a;
217 char *tbp = ci->text;
218 time_t now = time(0);
223 int fd = open(ci->file, O_RDONLY);
226 tbp = "[File not found]";
228 int l = read(fd, tbuff, sizeof(tbuff) - 1);
240 strftime(buff, sizeof(buff), tbp, localtime(&now));
245 for (p = buff; p; p = q) {
250 imlib_text_draw_with_return_metrics(x, y, p, &wid, &hig, &h_a, &v_a);
255 if (pix_fmt != PIX_FMT_BGRA32) {
256 if (img_convert(picture, pix_fmt,
257 &picture1, PIX_FMT_BGRA32, width, height) < 0) {
265 /* To ensure correct typing */
266 FrameHookConfigureFn ConfigureFn = Configure;
267 FrameHookProcessFn ProcessFn = Process;