283 lines
8.1 KiB
C
283 lines
8.1 KiB
C
/* blib - Library of useful things to hack the Blinkenlights
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*
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* Copyright (c) 2001-2002 The Blinkenlights Crew
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* Sven Neumann <sven@gimp.org>
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* Michael Natterer <mitch@gimp.org>
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*
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* This program 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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* This program 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <string.h>
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#include <glib-object.h>
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#include "btypes.h"
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#include "bmovie.h"
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#include "bmovie-gif-parser.h"
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#include "gif-load.h"
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/* #define DEBUG_GIF 1 */
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static void
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b_movie_gif_compose_frame (BMovie *movie,
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guchar *gray_buf,
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guchar *image_buf,
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gint image_colors,
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guchar *image_cmap,
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guchar *frame_buf,
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GIFDisposeType frame_disposal,
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gint frame_duration,
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gint frame_transparent,
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gint frame_width,
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gint frame_height,
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gint frame_off_x,
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gint frame_off_y,
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gint frame_colors,
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guchar *frame_cmap)
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{
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guchar *src;
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guchar *dest;
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guchar *d;
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guchar *cmap;
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gint colors;
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gint x, y;
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#if DEBUG_GIF
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g_printerr ("GIF frame: "
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"%dx%d @ %d,%d disposal: %d duration: %d transp: %d cmap: %s\n",
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frame_width, frame_height,
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frame_off_x, frame_off_y,
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frame_disposal,
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frame_duration,
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frame_transparent,
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frame_cmap ? "yes" : "no");
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#endif
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cmap = frame_cmap ? frame_cmap : image_cmap;
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colors = frame_cmap ? frame_colors : image_colors;
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src = frame_buf;
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dest = image_buf + frame_off_y * movie->width + frame_off_x;
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for (y = 0; y < frame_height; y++)
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{
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d = dest;
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for (x = 0; x < frame_width; x++)
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{
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if (frame_transparent > -1 &&
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*src == frame_transparent &&
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frame_disposal != DISPOSE_REPLACE)
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{
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d++;
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src++;
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}
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else
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{
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*d++ = *src++;
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}
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}
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dest += movie->width;
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}
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src = image_buf;
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dest = gray_buf;
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for (y = 0; y < movie->height; y++)
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{
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d = dest;
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for (x = 0; x < movie->width; x++)
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{
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if (*src < colors)
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{
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guchar *cmap_entry = cmap + *src * 3;
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#define INTENSITY_RED 0.30
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#define INTENSITY_GREEN 0.59
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#define INTENSITY_BLUE 0.11
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#define INTENSITY(r,g,b) ((r) * INTENSITY_RED + \
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(g) * INTENSITY_GREEN + \
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(b) * INTENSITY_BLUE + \
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(1) * (1.0 / 256.0))
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*d = INTENSITY (cmap_entry[0], cmap_entry[1], cmap_entry[2]);
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#undef INTENSITY_RED
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#undef INTENSITS_GREEN
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#undef INTENSITY_BLUE
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#undef INTENSITY
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}
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else
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{
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*d = 0;
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}
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d++;
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src++;
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}
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dest += movie->width;
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}
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b_movie_prepend_frame (movie, frame_duration, gray_buf);
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}
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gboolean
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b_movie_gif_parse_gif (BMovie *movie,
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GIOChannel *io,
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gboolean lazy,
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GError **error)
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{
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gint width;
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gint height;
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gint background;
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gint colors;
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guchar *cmap = NULL;
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GIFRecordType record_type;
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gint duration = 0;
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gchar *comment = NULL;
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guchar *buffer = NULL;
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guchar *frame_buffer = NULL;
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guchar *gray_buffer = NULL;
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gboolean success = FALSE;
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GIFDisposeType frame_disposal = DISPOSE_REPLACE;
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gint frame_delay = 100;
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gint frame_transparent = -1;
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if (! GIFDecodeHeader (io,
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TRUE, &width, &height, &background, &colors, &cmap))
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goto cleanup;
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movie->width = width;
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movie->height = height;
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#if DEBUG_GIF
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g_printerr ("GIF background: %d colors: %d\n", background, colors);
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#endif
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buffer = g_new0 (guchar, width * height);
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frame_buffer = g_new0 (guchar, width * height);
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gray_buffer = g_new0 (guchar, width * height);
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if (background > -1)
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memset (buffer, background, width * height);
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while (GIFDecodeRecordType (io, &record_type))
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{
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switch (record_type)
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{
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case IMAGE:
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{
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gint frame_width;
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gint frame_height;
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gint frame_off_x;
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gint frame_off_y;
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gint frame_colors;
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guchar *frame_cmap;
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if (! GIFDecodeImage (io,
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&frame_width, &frame_height,
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&frame_off_x, &frame_off_y,
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&frame_colors, &frame_cmap,
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frame_buffer))
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{
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g_set_error (error, 0, 0,
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"Broken or missing image frame");
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goto cleanup;
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}
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if (frame_delay < B_MOVIE_MIN_DELAY)
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{
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g_printerr ("Frame with %d ms duration, using %d ms instead\n",
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frame_delay, B_MOVIE_DEFAULT_DELAY);
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frame_delay = B_MOVIE_DEFAULT_DELAY;
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}
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duration += frame_delay;
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if (! lazy)
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{
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b_movie_gif_compose_frame (movie,
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gray_buffer,
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buffer,
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colors,
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cmap,
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frame_buffer,
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frame_disposal,
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frame_delay,
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frame_transparent,
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frame_width,
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frame_height,
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frame_off_x,
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frame_off_y,
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frame_colors,
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frame_cmap);
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}
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g_free (frame_cmap);
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}
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break;
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case GRAPHIC_CONTROL_EXTENSION:
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if (! GIFDecodeGraphicControlExt (io,
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&frame_disposal,
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&frame_delay,
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&frame_transparent))
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{
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g_set_error (error, 0, 0,
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"Broken or missing graphic control extension");
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goto cleanup;
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}
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break;
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case COMMENT_EXTENSION:
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if (! GIFDecodeCommentExt (io, &comment))
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{
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g_set_error (error, 0, 0,
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"Broken or missing comment extension");
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goto cleanup;
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}
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break;
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case UNKNOWN_EXTENSION:
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GIFDecodeUnknownExt (io);
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break;
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case TERMINATOR:
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success = TRUE;
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goto cleanup;
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}
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}
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cleanup:
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if (success && lazy)
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movie->duration = duration;
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g_free (cmap);
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g_free (buffer);
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g_free (frame_buffer);
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g_free (gray_buffer);
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g_free (comment);
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return success;
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}
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