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libcaca/examples/cacaview.c

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  1. /*

  2.  *  cacaview      image viewer for libcaca

  3.  *  Copyright (c) 2003 Sam Hocevar <sam@zoy.org>

  4.  *                All Rights Reserved

  5.  *

  6.  *  $Id$

  7.  *

  8.  *  This program is free software; you can redistribute it and/or

  9.  *  modify it under the terms of the GNU Lesser General Public

  10.  *  License as published by the Free Software Foundation; either

  11.  *  version 2 of the License, or (at your option) any later version.

  12.  *

  13.  *  This program is distributed in the hope that it will be useful,

  14.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  *  Lesser General Public License for more details.

  17.  *

  18.  *  You should have received a copy of the GNU Lesser General Public

  19.  *  License along with this program; if not, write to the Free Software

  20.  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

  21.  *  02111-1307  USA

  22.  */

  23. 

  24. #include "config.h"

  25. 

  26. #include <stdio.h>

  27. #include <string.h>

  28. #include <stdlib.h>

  29. #include <unistd.h>

  30. 

  31. #if defined(HAVE_IMLIB2_H)

  32. #   include <Imlib2.h>

  33. #else

  34. #   include <stdio.h>

  35. #endif

  36. 

  37. #if defined(HAVE_SLEEP)

  38. #   include <windows.h>

  39. #endif

  40. 

  41. #include "caca.h"

  42. 

  43. /* Local macros */

  44. #define STATUS_DITHERING 1

  45. #define STATUS_ANTIALIASING 2

  46. #define STATUS_BACKGROUND 3

  47. 

  48. /* Local functions */

  49. static void load_image(char const *);

  50. static void unload_image(void);

  51. static void draw_checkers(unsigned int, unsigned int,

  52.                           unsigned int, unsigned int);

  53. #if !defined(HAVE_IMLIB2_H)

  54. static int freadint(FILE *);

  55. static int freadshort(FILE *);

  56. static int freadchar(FILE *);

  57. #endif

  58. 

  59. /* Local variables */

  60. #if defined(HAVE_IMLIB2_H)

  61. Imlib_Image image = NULL;

  62. #endif

  63. char *pixels = NULL;

  64. struct caca_bitmap *bitmap = NULL;

  65. int x, y;

  66. unsigned int w, h, depth, bpp, rmask, gmask, bmask, amask;

  67. #if !defined(HAVE_IMLIB2_H)

  68. unsigned int red[256], green[256], blue[256], alpha[256];

  69. #endif

  70. 

  71. int main(int argc, char **argv)

  72. {

  73.     int quit = 0, update = 1, help = 0, fullscreen = 0, status = 0;

  74.     int reload = 0, zoom = 0;

  75. 

  76.     char **list = NULL;

  77.     int current = 0, items = 0, opts = 1;

  78.     int i;

  79. 

  80.     /* Initialise libcaca */

  81.     if(caca_init())

  82.     {

  83.         fprintf(stderr, "%s: unable to initialise libcaca\n", argv[0]);

  84.         return 1;

  85.     }

  86. 

  87.     /* Load items into playlist */

  88.     for(i = 1; i < argc; i++)

  89.     {

  90.         /* Skip options except after `--' */

  91.         if(opts && argv[i][0] == '-')

  92.         {

  93.             if(argv[i][1] == '-' && argv[i][2] == '\0')

  94.                 opts = 0;

  95.             continue;

  96.         }

  97. 

  98.         /* Add argv[i] to the list */

  99.         if(items)

  100.             list = realloc(list, (items + 1) * sizeof(char *));

  101.         else

  102.             list = malloc(sizeof(char *));

  103.         list[items] = argv[i];

  104.         items++;

  105. 

  106.         reload = 1;

  107.     }

  108. 

  109.     /* Go ! */

  110.     while(!quit)

  111.     {

  112.         int ww = caca_get_width();

  113.         int wh = caca_get_height();

  114. 

  115.         unsigned int event, new_status = 0, new_help = 0;

  116. 

  117.         while((event = caca_get_event(CACA_EVENT_KEY_PRESS)))

  118.         {

  119.             unsigned int key = event & 0x00ffffff;

  120. 

  121.             switch(key)

  122.             {

  123.             case 'n':

  124.             case 'N':

  125.                 if(items) current = (current + 1) % items;

  126.                 reload = 1;

  127.                 break;

  128.             case 'p':

  129.             case 'P':

  130.                 if(items) current = (items + current - 1) % items;

  131.                 reload = 1;

  132.                 break;

  133.             case 'f':

  134.             case 'F':

  135.                 fullscreen = ~fullscreen;

  136.                 update = 1;

  137.                 break;

  138.             case 'b':

  139.                 i = 1 + caca_get_feature(CACA_BACKGROUND);

  140.                 if(i > CACA_BACKGROUND_MAX) i = CACA_BACKGROUND_MIN;

  141.                 caca_set_feature(i);

  142.                 new_status = STATUS_BACKGROUND;

  143.                 update = 1;

  144.                 break;

  145.             case 'B':

  146.                 i = -1 + caca_get_feature(CACA_BACKGROUND);

  147.                 if(i < CACA_BACKGROUND_MIN) i = CACA_BACKGROUND_MAX;

  148.                 caca_set_feature(i);

  149.                 new_status = STATUS_BACKGROUND;

  150.                 update = 1;

  151.                 break;

  152.             case 'a':

  153.                 i = 1 + caca_get_feature(CACA_ANTIALIASING);

  154.                 if(i > CACA_ANTIALIASING_MAX) i = CACA_ANTIALIASING_MIN;

  155.                 caca_set_feature(i);

  156.                 new_status = STATUS_ANTIALIASING;

  157.                 update = 1;

  158.                 break;

  159.             case 'A':

  160.                 i = -1 + caca_get_feature(CACA_ANTIALIASING);

  161.                 if(i < CACA_ANTIALIASING_MIN) i = CACA_ANTIALIASING_MAX;

  162.                 caca_set_feature(i);

  163.                 new_status = STATUS_ANTIALIASING;

  164.                 update = 1;

  165.                 break;

  166.             case 'd':

  167.                 i = 1 + caca_get_feature(CACA_DITHERING);

  168.                 if(i > CACA_DITHERING_MAX) i = CACA_DITHERING_MIN;

  169.                 caca_set_feature(i);

  170.                 new_status = STATUS_DITHERING;

  171.                 update = 1;

  172.                 break;

  173.             case 'D':

  174.                 i = -1 + caca_get_feature(CACA_DITHERING);

  175.                 if(i < CACA_DITHERING_MIN) i = CACA_DITHERING_MAX;

  176.                 caca_set_feature(i);

  177.                 new_status = STATUS_DITHERING;

  178.                 update = 1;

  179.                 break;

  180.             case '+':

  181.                 zoom++;

  182.                 if(zoom > 48) zoom = 48; else update = 1;

  183.                 break;

  184.             case '-':

  185.                 zoom--;

  186.                 if(zoom < -48) zoom = -48; else update = 1;

  187.                 break;

  188.             case 'x':

  189.             case 'X':

  190.                 zoom = 0;

  191.                 update = 1;

  192.                 break;

  193.             case 'k':

  194.             case 'K':

  195.             case CACA_KEY_UP:

  196.                 if(zoom > 0) y -= 1 + h / (2 + zoom) / 8;

  197.                 update = 1;

  198.                 break;

  199.             case 'j':

  200.             case 'J':

  201.             case CACA_KEY_DOWN:

  202.                 if(zoom > 0) y += 1 + h / (2 + zoom) / 8;

  203.                 update = 1;

  204.                 break;

  205.             case 'h':

  206.             case 'H':

  207.             case CACA_KEY_LEFT:

  208.                 if(zoom > 0) x -= 1 + w / (2 + zoom) / 8;

  209.                 update = 1;

  210.                 break;

  211.             case 'l':

  212.             case 'L':

  213.             case CACA_KEY_RIGHT:

  214.                 if(zoom > 0) x += 1 + w / (2 + zoom) / 8;

  215.                 update = 1;

  216.                 break;

  217.             case '?':

  218.                 new_help = !help;

  219.                 update = 1;

  220.                 break;

  221.             case 'q':

  222.             case 'Q':

  223.                 quit = 1;

  224.                 break;

  225.             }

  226. 

  227.             if(status || new_status)

  228.                 status = new_status;

  229. 

  230.             if(help || new_help)

  231.                 help = new_help;

  232.         }

  233. 

  234.         if(items && reload)

  235.         {

  236.             char *buffer;

  237.             int len = strlen(" Loading `%s'... ") + strlen(list[current]);

  238. 

  239.             if(len < ww + 1)

  240.                 len = ww + 1;

  241. 

  242.             buffer = malloc(len);

  243. 

  244.             /* Reset image-specific runtime variables */

  245.             zoom = 0;

  246. 

  247.             sprintf(buffer, " Loading `%s'... ", list[current]);

  248.             buffer[ww] = '\0';

  249.             caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);

  250.             caca_putstr((ww - strlen(buffer)) / 2, wh / 2, buffer);

  251.             caca_refresh();

  252. 

  253.             unload_image();

  254.             load_image(list[current]);

  255.             reload = 0;

  256.             update = 1;

  257. 

  258.             free(buffer);

  259.         }

  260. 

  261.         if(!update)

  262.         {

  263. #if defined(HAVE_USLEEP)

  264.             usleep(10000);

  265. #elif defined(HAVE_SLEEP)

  266.             Sleep(10);

  267. #endif

  268.             continue;

  269.         }

  270. 

  271.         caca_clear();

  272. 

  273.         if(!items)

  274.         {

  275.             caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);

  276.             caca_printf(ww / 2 - 5, wh / 2, " No image. ");

  277.         }

  278.         else if(!pixels)

  279.         {

  280. #if defined(HAVE_IMLIB2_H)

  281. #   define ERROR_STRING " Error loading `%s'. "

  282. #else

  283. #   define ERROR_STRING " Error loading `%s'. Only BMP is supported. "

  284. #endif

  285.             char *buffer;

  286.             int len = strlen(ERROR_STRING) + strlen(list[current]);

  287. 

  288.             if(len < ww + 1)

  289.                 len = ww + 1;

  290. 

  291.             buffer = malloc(len);

  292. 

  293.             sprintf(buffer, ERROR_STRING, list[current]);

  294.             buffer[ww] = '\0';

  295.             caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);

  296.             caca_putstr((ww - strlen(buffer)) / 2, wh / 2, buffer);

  297.             free(buffer);

  298.         }

  299.         else if(zoom < 0)

  300.         {

  301.             int xo = (ww - 1) / 2;

  302.             int yo = (wh - 1) / 2;

  303.             int xn = (ww - 1) / (2 - zoom);

  304.             int yn = (wh - 1) / (2 - zoom);

  305.             draw_checkers(xo - xn, yo - yn, xo + xn, yo + yn);

  306.             caca_draw_bitmap(xo - xn, yo - yn, xo + xn, yo + yn,

  307.                              bitmap, pixels);

  308.         }

  309.         else if(zoom > 0)

  310.         {

  311.             struct caca_bitmap *newbitmap;

  312.             int xn = w / (2 + zoom);

  313.             int yn = h / (2 + zoom);

  314.             if(x < xn) x = xn;

  315.             if(y < yn) y = yn;

  316.             if(xn + x > (int)w) x = w - xn;

  317.             if(yn + y > (int)h) y = h - yn;

  318.             newbitmap = caca_create_bitmap(bpp, 2 * xn, 2 * yn, depth * w,

  319.                                            rmask, gmask, bmask, amask);

  320. #if !defined(HAVE_IMLIB2_H)

  321.             if(bpp == 8)

  322.                 caca_set_bitmap_palette(newbitmap, red, green, blue, alpha);

  323. #endif

  324.             draw_checkers(0, fullscreen ? 0 : 1,

  325.                           ww - 1, fullscreen ? wh - 1 : wh - 3);

  326.             caca_draw_bitmap(0, fullscreen ? 0 : 1,

  327.                              ww - 1, fullscreen ? wh - 1 : wh - 3,

  328.                              newbitmap,

  329.                              pixels + depth * (x - xn) + depth * w * (y - yn));

  330.             caca_free_bitmap(newbitmap);

  331.         }

  332.         else

  333.         {

  334.             draw_checkers(0, fullscreen ? 0 : 1,

  335.                           ww - 1, fullscreen ? wh - 1 : wh - 3);

  336.             caca_draw_bitmap(0, fullscreen ? 0 : 1,

  337.                              ww - 1, fullscreen ? wh - 1 : wh - 3,

  338.                              bitmap, pixels);

  339.         }

  340. 

  341.         if(!fullscreen)

  342.         {

  343.             caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);

  344.             caca_draw_line(0, 0, ww - 1, 0, ' ');

  345.             caca_draw_line(0, wh - 2, ww - 1, wh - 2, '-');

  346.             caca_putstr(0, 0, "q:Quit  np:Next/Prev  +-x:Zoom  "

  347.                               "hjkl:Move  d:Dithering  a:Antialias");

  348.             caca_putstr(ww - strlen("?:Help"), 0, "?:Help");

  349.             caca_printf(3, wh - 2, "cacaview %s", VERSION);

  350.             caca_printf(ww - 14, wh - 2,

  351.                         "(zoom: %s%i)", zoom > 0 ? "+" : "", zoom);

  352. 

  353.             caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

  354.             caca_draw_line(0, wh - 1, ww - 1, wh - 1, ' ');

  355.             switch(status)

  356.             {

  357.                 case STATUS_ANTIALIASING:

  358.                     caca_printf(0, wh - 1, "Antialiasing: %s",

  359.                   caca_get_feature_name(caca_get_feature(CACA_ANTIALIASING)));

  360.                     break;

  361.                 case STATUS_DITHERING:

  362.                     caca_printf(0, wh - 1, "Dithering: %s",

  363.                   caca_get_feature_name(caca_get_feature(CACA_DITHERING)));

  364.                     break;

  365.                 case STATUS_BACKGROUND:

  366.                     caca_printf(0, wh - 1, "Background: %s",

  367.                   caca_get_feature_name(caca_get_feature(CACA_BACKGROUND)));

  368.                     break;

  369.             }

  370.         }

  371. 

  372.         if(help)

  373.         {

  374.             caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLUE);

  375.             caca_putstr(ww - 25, 2,  " +: zoom in             ");

  376.             caca_putstr(ww - 25, 3,  " -: zoom out            ");

  377.             caca_putstr(ww - 25, 4,  " x: reset zoom          ");

  378.             caca_putstr(ww - 25, 5,  " ---------------------- ");

  379.             caca_putstr(ww - 25, 6,  " hjkl: move view        ");

  380.             caca_putstr(ww - 25, 7,  " arrows: move view      ");

  381.             caca_putstr(ww - 25, 8,  " ---------------------- ");

  382.             caca_putstr(ww - 25, 9,  " a: antialiasing method ");

  383.             caca_putstr(ww - 25, 10, " d: dithering method    ");

  384.             caca_putstr(ww - 25, 11, " b: background mode     ");

  385.             caca_putstr(ww - 25, 12, " ---------------------- ");

  386.             caca_putstr(ww - 25, 13, " ?: help                ");

  387.             caca_putstr(ww - 25, 14, " q: quit                ");

  388.         }

  389. 

  390.         caca_refresh();

  391.         update = 0;

  392.     }

  393. 

  394.     /* Clean up */

  395.     unload_image();

  396.     caca_end();

  397. 

  398.     return 0;

  399. }

  400. 

  401. static void unload_image(void)

  402. {

  403. #if defined(HAVE_IMLIB2_H)

  404.     if(image)

  405.         imlib_free_image();

  406.     image = NULL;

  407.     pixels = NULL;

  408. #else

  409.     if(pixels)

  410.         free(pixels);

  411.     pixels = NULL;

  412. #endif

  413.     if(bitmap)

  414.         caca_free_bitmap(bitmap);

  415.     bitmap = NULL;

  416. }

  417. 

  418. static void load_image(char const *name)

  419. {

  420. #if defined(HAVE_IMLIB2_H)

  421.     /* Load the new image */

  422.     image = imlib_load_image(name);

  423. 

  424.     if(!image)

  425.         return;

  426. 

  427.     imlib_context_set_image(image);

  428.     pixels = (char *)imlib_image_get_data_for_reading_only();

  429.     w = imlib_image_get_width();

  430.     h = imlib_image_get_height();

  431.     rmask = 0x00ff0000;

  432.     gmask = 0x0000ff00;

  433.     bmask = 0x000000ff;

  434.     amask = 0xff000000;

  435.     bpp = 32;

  436.     depth = 4;

  437. 

  438.     /* Create the libcaca bitmap */

  439.     bitmap = caca_create_bitmap(bpp, w, h, depth * w,

  440.                                 rmask, gmask, bmask, amask);

  441.     if(!bitmap)

  442.     {

  443.         imlib_free_image();

  444.         image = NULL;

  445.     }

  446. 

  447. #else

  448.     /* Try to load a BMP file */

  449.     FILE *fp;

  450.     unsigned int i, colors, offset, tmp, planes;

  451. 

  452.     fp = fopen(name, "rb");

  453.     if(!fp)

  454.         return;

  455. 

  456.     if(freadshort(fp) != 0x4d42)

  457.     {

  458.         fclose(fp);

  459.         return;

  460.     }

  461. 

  462.     freadint(fp); /* size */

  463.     freadshort(fp); /* reserved 1 */

  464.     freadshort(fp); /* reserved 2 */

  465. 

  466.     offset = freadint(fp);

  467. 

  468.     tmp = freadint(fp); /* header size */

  469.     if(tmp == 40)

  470.     {

  471.         w = freadint(fp);

  472.         h = freadint(fp);

  473.         planes = freadshort(fp);

  474.         bpp = freadshort(fp);

  475. 

  476.         tmp = freadint(fp); /* compression */

  477.         if(tmp != 0)

  478.         {

  479.             fclose(fp);

  480.             return;

  481.         }

  482. 

  483.         freadint(fp); /* sizeimage */

  484.         freadint(fp); /* xpelspermeter */

  485.         freadint(fp); /* ypelspermeter */

  486.         freadint(fp); /* biclrused */

  487.         freadint(fp); /* biclrimportantn */

  488. 

  489.         colors = (offset - 54) / 4;

  490.         for(i = 0; i < colors && i < 256; i++)

  491.         {

  492.             blue[i] = freadchar(fp) * 16;

  493.             green[i] = freadchar(fp) * 16;

  494.             red[i] = freadchar(fp) * 16;

  495.             alpha[i] = 0;

  496.             freadchar(fp);

  497.         }

  498.     }

  499.     else if(tmp == 12)

  500.     {

  501.         w = freadint(fp);

  502.         h = freadint(fp);

  503.         planes = freadshort(fp);

  504.         bpp = freadshort(fp);

  505. 

  506.         colors = (offset - 26) / 3;

  507.         for(i = 0; i < colors && i < 256; i++)

  508.         {

  509.             blue[i] = freadchar(fp);

  510.             green[i] = freadchar(fp);

  511.             red[i] = freadchar(fp);

  512.             alpha[i] = 0;

  513.         }

  514.     }

  515.     else

  516.     {

  517.         fclose(fp);

  518.         return;

  519.     }

  520. 

  521.     /* Fill the rest of the palette */

  522.     for(i = colors; i < 256; i++)

  523.         blue[i] = green[i] = red[i] = alpha[i] = 0;

  524. 

  525.     depth = (bpp + 7) / 8;

  526. 

  527.     /* Sanity check */

  528.     if(!w || w > 0x10000 || !h || h > 0x10000 || planes != 1 /*|| bpp != 24*/)

  529.     {

  530.         fclose(fp);

  531.         return;

  532.     }

  533. 

  534.     /* Allocate the pixel buffer */

  535.     pixels = malloc(w * h * depth);

  536.     if(!pixels)

  537.     {

  538.         fclose(fp);

  539.         return;

  540.     }

  541. 

  542.     memset(pixels, 0, w * h * depth);

  543. 

  544.     /* Read the bitmap data */

  545.     for(i = h; i--; )

  546.     {

  547.         unsigned int j, k, bits = 0;

  548. 

  549.         switch(bpp)

  550.         {

  551.             case 1:

  552.                 for(j = 0; j < w; j++)

  553.                 {

  554.                     k = j % 32;

  555.                     if(k == 0)

  556.                         bits = freadint(fp);

  557.                     pixels[w * i * depth + j] =

  558.                         (bits >> ((k & ~0xf) + 0xf - (k & 0xf))) & 0x1;

  559.                 }

  560.                 break;

  561.             case 4:

  562.                 for(j = 0; j < w; j++)

  563.                 {

  564.                     k = j % 8;

  565.                     if(k == 0)

  566.                         bits = freadint(fp);

  567.                     pixels[w * i * depth + j] =

  568.                         (bits >> (4 * ((k & ~0x1) + 0x1 - (k & 0x1)))) & 0xf;

  569.                 }

  570.                 break;

  571.             default:

  572.                 /* Works for 8bpp, but also for 16, 24 etc. */

  573.                 fread(pixels + w * i * depth, w * depth, 1, fp);

  574.                 /* Pad reads to 4 bytes */

  575.                 tmp = (w * depth) % 4;

  576.                 tmp = (4 - tmp) % 4;

  577.                 while(tmp--)

  578.                     freadchar(fp);

  579.                 break;

  580.         }

  581.     }

  582. 

  583.     switch(depth)

  584.     {

  585.     case 3:

  586.         rmask = 0xff0000;

  587.         gmask = 0x00ff00;

  588.         bmask = 0x0000ff;

  589.         amask = 0x000000;

  590.         break;

  591.     case 2: /* XXX: those are the 16 bits values */

  592.         rmask = 0x7c00;

  593.         gmask = 0x03e0;

  594.         bmask = 0x001f;

  595.         amask = 0x0000;

  596.         break;

  597.     case 1:

  598.     default:

  599.         bpp = 8;

  600.         rmask = gmask = bmask = amask = 0;

  601.         break;

  602.     }

  603. 

  604.     fclose(fp);

  605. 

  606.     /* Create the libcaca bitmap */

  607.     bitmap = caca_create_bitmap(bpp, w, h, depth * w,

  608.                                 rmask, gmask, bmask, amask);

  609.     if(!bitmap)

  610.     {

  611.         free(pixels);

  612.         pixels = NULL;

  613.         return;

  614.     }

  615. 

  616.     if(bpp == 8)

  617.         caca_set_bitmap_palette(bitmap, red, green, blue, alpha);

  618. #endif

  619. 

  620.     x = w / 2;

  621.     y = h / 2;

  622. }

  623. 

  624. static void draw_checkers(unsigned int x1, unsigned int y1,

  625.                           unsigned int x2, unsigned int y2)

  626. {

  627.     unsigned int xn, yn;

  628. 

  629.     for(yn = y1; yn <= y2; yn++)

  630.         for(xn = x1; xn <= x2; xn++)

  631.     {

  632.         if((((xn - x1) / 5) ^ ((yn - y1) / 3)) & 1)

  633.             caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_DARKGRAY);

  634.         else

  635.             caca_set_color(CACA_COLOR_DARKGRAY, CACA_COLOR_LIGHTGRAY);

  636.         caca_putchar(xn, yn, ' ');

  637.     }

  638. }

  639. 

  640. #if !defined(HAVE_IMLIB2_H)

  641. static int freadint(FILE *fp)

  642. {

  643.     unsigned char buffer[4];

  644.     fread(buffer, 4, 1, fp);

  645.     return ((int)buffer[3] << 24) | ((int)buffer[2] << 16)

  646.              | ((int)buffer[1] << 8) | ((int)buffer[0]);

  647. }

  648. 

  649. static int freadshort(FILE *fp)

  650. {

  651.     unsigned char buffer[2];

  652.     fread(buffer, 2, 1, fp);

  653.     return ((int)buffer[1] << 8) | ((int)buffer[0]);

  654. }

  655. 

  656. static int freadchar(FILE *fp)

  657. {

  658.     unsigned char buffer;

  659.     fread(&buffer, 1, 1, fp);

  660.     return (int)buffer;

  661. }

  662. #endif