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* cacaview image viewer for libcaca
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* Copyright (c) 2003 Sam Hocevar <sam@zoy.org>
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* $Id: cacaview.c 257 2004-01-23 09:20:39Z sam $
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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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 GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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#if defined(HAVE_IMLIB2_H)
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#if defined(HAVE_SLEEP)
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#define STATUS_DITHERING 1
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#define STATUS_ANTIALIASING 2
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#define STATUS_BACKGROUND 3
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#define ZOOM_FACTOR 1.08f
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static void print_status(void);
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static void print_help(int, int);
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static void set_zoom(int);
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static void load_image(char const *);
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static void unload_image(void);
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static void draw_checkers(int, int, int, int);
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#if !defined(HAVE_IMLIB2_H)
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static int freadint(FILE *);
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static int freadshort(FILE *);
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static int freadchar(FILE *);
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#if defined(HAVE_IMLIB2_H)
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Imlib_Image image = NULL;
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struct caca_bitmap *bitmap = NULL;
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unsigned int w, h, depth, bpp, rmask, gmask, bmask, amask;
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#if !defined(HAVE_IMLIB2_H)
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unsigned int red[256], green[256], blue[256], alpha[256];
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float zoomtab[ZOOM_MAX + 1];
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float xfactor = 1.0, yfactor = 1.0, dx = 0.5, dy = 0.5;
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int zoom = 0, fullscreen = 0, mode, ww, wh;
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int main(int argc, char **argv)
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int quit = 0, update = 1, help = 0, status = 0;
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int current = 0, items = 0, opts = 1;
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/* Initialise libcaca */
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fprintf(stderr, "%s: unable to initialise libcaca\n", argv[0]);
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/* Set the window title */
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caca_set_window_title("cacaview");
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ww = caca_get_width();
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wh = caca_get_height();
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/* Fill the zoom table */
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for(i = 0; i < ZOOM_MAX; i++)
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zoomtab[i + 1] = zoomtab[i] * 1.08;
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/* Load items into playlist */
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for(i = 1; i < argc; i++)
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/* Skip options except after `--' */
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if(opts && argv[i][0] == '-')
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if(argv[i][1] == '-' && argv[i][2] == '\0')
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/* Add argv[i] to the list */
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list = realloc(list, (items + 1) * sizeof(char *));
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list = malloc(sizeof(char *));
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list[items] = argv[i];
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unsigned int const event_mask = CACA_EVENT_KEY_PRESS
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| CACA_EVENT_MOUSE_PRESS;
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unsigned int event, new_status = 0, new_help = 0;
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event = caca_get_event(event_mask);
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event = caca_wait_event(event_mask);
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if(event & CACA_EVENT_MOUSE_PRESS)
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if((event & 0x00ffffff) == 1)
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if(items) current = (current + 1) % items;
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else if((event & 0x00ffffff) == 2)
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if(items) current = (items + current - 1) % items;
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else if(event & CACA_EVENT_KEY_PRESS) switch(event & 0x00ffffff)
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if(items) current = (current + 1) % items;
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if(items) current = (items + current - 1) % items;
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fullscreen = ~fullscreen;
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i = 1 + caca_get_feature(CACA_BACKGROUND);
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if(i > CACA_BACKGROUND_MAX) i = CACA_BACKGROUND_MIN;
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new_status = STATUS_BACKGROUND;
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i = -1 + caca_get_feature(CACA_BACKGROUND);
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if(i < CACA_BACKGROUND_MIN) i = CACA_BACKGROUND_MAX;
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new_status = STATUS_BACKGROUND;
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i = 1 + caca_get_feature(CACA_ANTIALIASING);
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if(i > CACA_ANTIALIASING_MAX) i = CACA_ANTIALIASING_MIN;
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new_status = STATUS_ANTIALIASING;
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i = -1 + caca_get_feature(CACA_ANTIALIASING);
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if(i < CACA_ANTIALIASING_MIN) i = CACA_ANTIALIASING_MAX;
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new_status = STATUS_ANTIALIASING;
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i = 1 + caca_get_feature(CACA_DITHERING);
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if(i > CACA_DITHERING_MAX) i = CACA_DITHERING_MIN;
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new_status = STATUS_DITHERING;
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i = -1 + caca_get_feature(CACA_DITHERING);
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if(i < CACA_DITHERING_MIN) i = CACA_DITHERING_MAX;
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new_status = STATUS_DITHERING;
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if(yfactor > 1.0) dy -= PAD_STEP / yfactor;
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if(dy < 0.0) dy = 0.0;
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if(yfactor > 1.0) dy += PAD_STEP / yfactor;
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if(dy > 1.0) dy = 1.0;
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if(xfactor > 1.0) dx -= PAD_STEP / xfactor;
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if(dx < 0.0) dx = 0.0;
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if(xfactor > 1.0) dx += PAD_STEP / xfactor;
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if(dx > 1.0) dx = 1.0;
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else if(event == CACA_EVENT_RESIZE)
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ww = caca_get_width();
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wh = caca_get_height();
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if(status || new_status)
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event = caca_get_event(CACA_EVENT_KEY_PRESS);
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int len = strlen(" Loading `%s'... ") + strlen(list[current]);
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buffer = malloc(len);
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sprintf(buffer, " Loading `%s'... ", list[current]);
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caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
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caca_putstr((ww - strlen(buffer)) / 2, wh / 2, buffer);
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ww = caca_get_width();
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wh = caca_get_height();
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load_image(list[current]);
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/* Reset image-specific runtime variables */
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caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
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caca_printf(ww / 2 - 5, wh / 2, " No image. ");
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#if defined(HAVE_IMLIB2_H)
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# define ERROR_STRING " Error loading `%s'. "
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# define ERROR_STRING " Error loading `%s'. Only BMP is supported. "
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int len = strlen(ERROR_STRING) + strlen(list[current]);
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buffer = malloc(len);
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sprintf(buffer, ERROR_STRING, list[current]);
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caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
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caca_putstr((ww - strlen(buffer)) / 2, wh / 2, buffer);
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float xdelta, ydelta;
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y = fullscreen ? 0 : 1;
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height = fullscreen ? wh : wh - 3;
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xdelta = (xfactor > 1.0) ? dx : 0.5;
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ydelta = (yfactor > 1.0) ? dy : 0.5;
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draw_checkers(ww * (1.0 - xfactor) / 2,
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y + height * (1.0 - yfactor) / 2,
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ww * (1.0 + xfactor) / 2,
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y + height * (1.0 + yfactor) / 2);
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caca_draw_bitmap(ww * (1.0 - xfactor) * xdelta,
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y + height * (1.0 - yfactor) * ydelta,
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ww * (xdelta + (1.0 - xdelta) * xfactor),
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y + height * (ydelta + (1.0 - ydelta) * yfactor),
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caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);
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case STATUS_ANTIALIASING:
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caca_printf(0, wh - 1, "Antialiasing: %s",
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caca_get_feature_name(caca_get_feature(CACA_ANTIALIASING)));
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case STATUS_DITHERING:
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caca_printf(0, wh - 1, "Dithering: %s",
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caca_get_feature_name(caca_get_feature(CACA_DITHERING)));
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case STATUS_BACKGROUND:
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caca_printf(0, wh - 1, "Background: %s",
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caca_get_feature_name(caca_get_feature(CACA_BACKGROUND)));
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print_help(ww - 25, 2);
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static void print_status(void)
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caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
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caca_draw_line(0, 0, ww - 1, 0, ' ');
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caca_draw_line(0, wh - 2, ww - 1, wh - 2, '-');
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caca_putstr(0, 0, "q:Quit np:Next/Prev +-x:Zoom "
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"hjkl:Move d:Dithering a:Antialias");
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caca_putstr(ww - strlen("?:Help"), 0, "?:Help");
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caca_printf(3, wh - 2, "cacaview %s", VERSION);
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caca_printf(ww - 14, wh - 2, "(zoom: %s%i)", zoom > 0 ? "+" : "", zoom);
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caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);
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caca_draw_line(0, wh - 1, ww - 1, wh - 1, ' ');
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static void print_help(int x, int y)
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static char const *help[] =
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" ---------------------- ",
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" arrows: move view ",
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" ---------------------- ",
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" a: antialiasing method ",
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" d: dithering method ",
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" b: background mode ",
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" ---------------------- ",
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caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);
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for(i = 0; help[i]; i++)
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caca_putstr(x, y + i, help[i]);
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static void set_zoom(int new_zoom)
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if(zoom > ZOOM_MAX) zoom = ZOOM_MAX;
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if(zoom < -ZOOM_MAX) zoom = -ZOOM_MAX;
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ww = caca_get_width();
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height = fullscreen ? wh : wh - 3;
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xfactor = (zoom < 0) ? 1.0 / zoomtab[-zoom] : zoomtab[zoom];
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yfactor = xfactor * ww / height * h / w
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* caca_get_height() / caca_get_width()
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* caca_get_window_width() / caca_get_window_height();
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if(yfactor > xfactor)
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xfactor = tmp * tmp / yfactor;
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static void unload_image(void)
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#if defined(HAVE_IMLIB2_H)
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caca_free_bitmap(bitmap);
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static void load_image(char const *name)
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#if defined(HAVE_IMLIB2_H)
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/* Load the new image */
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image = imlib_load_image(name);
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imlib_context_set_image(image);
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pixels = (char *)imlib_image_get_data_for_reading_only();
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w = imlib_image_get_width();
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h = imlib_image_get_height();
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/* Create the libcaca bitmap */
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bitmap = caca_create_bitmap(bpp, w, h, depth * w,
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rmask, gmask, bmask, amask);
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/* Try to load a BMP file */
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unsigned int i, colors, offset, tmp, planes;
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fp = fopen(name, "rb");
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if(freadshort(fp) != 0x4d42)
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freadint(fp); /* size */
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freadshort(fp); /* reserved 1 */
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freadshort(fp); /* reserved 2 */
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offset = freadint(fp);
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tmp = freadint(fp); /* header size */
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planes = freadshort(fp);
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bpp = freadshort(fp);
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tmp = freadint(fp); /* compression */
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freadint(fp); /* sizeimage */
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freadint(fp); /* xpelspermeter */
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freadint(fp); /* ypelspermeter */
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freadint(fp); /* biclrused */
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freadint(fp); /* biclrimportantn */
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colors = (offset - 54) / 4;
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for(i = 0; i < colors && i < 256; i++)
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blue[i] = freadchar(fp) * 16;
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green[i] = freadchar(fp) * 16;
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red[i] = freadchar(fp) * 16;
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planes = freadshort(fp);
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bpp = freadshort(fp);
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colors = (offset - 26) / 3;
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for(i = 0; i < colors && i < 256; i++)
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blue[i] = freadchar(fp);
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green[i] = freadchar(fp);
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red[i] = freadchar(fp);
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/* Fill the rest of the palette */
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for(i = colors; i < 256; i++)
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blue[i] = green[i] = red[i] = alpha[i] = 0;
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depth = (bpp + 7) / 8;
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if(!w || w > 0x10000 || !h || h > 0x10000 || planes != 1 /*|| bpp != 24*/)
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/* Allocate the pixel buffer */
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pixels = malloc(w * h * depth);
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memset(pixels, 0, w * h * depth);
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/* Read the bitmap data */
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unsigned int j, k, bits = 0;
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for(j = 0; j < w; j++)
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pixels[w * i * depth + j] =
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(bits >> ((k & ~0xf) + 0xf - (k & 0xf))) & 0x1;
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for(j = 0; j < w; j++)
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pixels[w * i * depth + j] =
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(bits >> (4 * ((k & ~0x1) + 0x1 - (k & 0x1)))) & 0xf;
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/* Works for 8bpp, but also for 16, 24 etc. */
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fread(pixels + w * i * depth, w * depth, 1, fp);
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/* Pad reads to 4 bytes */
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tmp = (w * depth) % 4;
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case 2: /* XXX: those are the 16 bits values */
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rmask = gmask = bmask = amask = 0;
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/* Create the libcaca bitmap */
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bitmap = caca_create_bitmap(bpp, w, h, depth * w,
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rmask, gmask, bmask, amask);
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caca_set_bitmap_palette(bitmap, red, green, blue, alpha);
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static void draw_checkers(int x1, int y1, int x2, int y2)
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if(x2 + 1 > (int)caca_get_width()) x2 = caca_get_width() - 1;
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if(y2 + 1 > (int)caca_get_height()) y2 = caca_get_height() - 1;
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for(yn = y1 > 0 ? y1 : 0; yn <= y2; yn++)
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for(xn = x1 > 0 ? x1 : 0; xn <= x2; xn++)
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if((((xn - x1) / 5) ^ ((yn - y1) / 3)) & 1)
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caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_DARKGRAY);
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caca_set_color(CACA_COLOR_DARKGRAY, CACA_COLOR_LIGHTGRAY);
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caca_putchar(xn, yn, ' ');
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#if !defined(HAVE_IMLIB2_H)
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static int freadint(FILE *fp)
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unsigned char buffer[4];
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fread(buffer, 4, 1, fp);
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return ((int)buffer[3] << 24) | ((int)buffer[2] << 16)
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| ((int)buffer[1] << 8) | ((int)buffer[0]);
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static int freadshort(FILE *fp)
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unsigned char buffer[2];
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fread(buffer, 2, 1, fp);
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return ((int)buffer[1] << 8) | ((int)buffer[0]);
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static int freadchar(FILE *fp)
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unsigned char buffer;
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fread(&buffer, 1, 1, fp);
added
removed
examples/cacaview.c
