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libcaca/caca/codec/export.c

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  1. /*

  2.  *  libcaca       Colour ASCII-Art library

  3.  *  Copyright (c) 2002-2006 Sam Hocevar <sam@zoy.org>

  4.  *                2006 Jean-Yves Lamoureux <jylam@lnxscene.org>

  5.  *                All Rights Reserved

  6.  *

  7.  *  $Id$

  8.  *

  9.  *  This library is free software. It comes without any warranty, to

  10.  *  the extent permitted by applicable law. You can redistribute it

  11.  *  and/or modify it under the terms of the Do What The Fuck You Want

  12.  *  To Public License, Version 2, as published by Sam Hocevar. See

  13.  *  http://sam.zoy.org/wtfpl/COPYING for more details.

  14.  */

  15. 

  16. /*

  17.  *  This file contains various export functions

  18.  */

  19. 

  20. #include "config.h"

  21. 

  22. #if !defined(__KERNEL__)

  23. #   include <stdlib.h>

  24. #   include <stdio.h>

  25. #   include <string.h>

  26. #endif

  27. 

  28. #include "caca.h"

  29. #include "caca_internals.h"

  30. 

  31. static inline int sprintu32(char *s, uint32_t x)

  32. {

  33.     s[0] = (uint8_t)(x >> 24);

  34.     s[1] = (uint8_t)(x >> 16) & 0xff;

  35.     s[2] = (uint8_t)(x >>  8) & 0xff;

  36.     s[3] = (uint8_t)(x      ) & 0xff;

  37.     return 4;

  38. }

  39. 

  40. static inline int sprintu16(char *s, uint16_t x)

  41. {

  42.     s[0] = (uint8_t)(x >>  8) & 0xff;

  43.     s[1] = (uint8_t)(x      ) & 0xff;

  44.     return 2;

  45. }

  46. 

  47. static void *export_caca(caca_canvas_t const *, size_t *);

  48. static void *export_ansi(caca_canvas_t const *, size_t *);

  49. static void *export_utf8(caca_canvas_t const *, size_t *, int);

  50. static void *export_html(caca_canvas_t const *, size_t *);

  51. static void *export_html3(caca_canvas_t const *, size_t *);

  52. static void *export_bbfr(caca_canvas_t const *, size_t *);

  53. static void *export_irc(caca_canvas_t const *, size_t *);

  54. static void *export_ps(caca_canvas_t const *, size_t *);

  55. static void *export_svg(caca_canvas_t const *, size_t *);

  56. static void *export_tga(caca_canvas_t const *, size_t *);

  57. 

  58. /** \brief Export a canvas into a foreign format.

  59.  *

  60.  *  This function exports a libcaca canvas into various foreign formats such

  61.  *  as ANSI art, HTML, IRC colours, etc. The returned pointer should be passed

  62.  *  to free() to release the allocated storage when it is no longer needed.

  63.  *

  64.  *  Valid values for \c format are:

  65.  *  - \c "caca": export native libcaca files.

  66.  *  - \c "ansi": export ANSI art (CP437 charset with ANSI colour codes).

  67.  *  - \c "html": export an HTML page with CSS information.

  68.  *  - \c "html3": export an HTML table that should be compatible with

  69.  *    most navigators, including textmode ones.

  70.  *  - \c "irc": export UTF-8 text with mIRC colour codes.

  71.  *  - \c "ps": export a PostScript document.

  72.  *  - \c "svg": export an SVG vector image.

  73.  *  - \c "tga": export a TGA image.

  74.  *

  75.  *  If an error occurs, NULL is returned and \b errno is set accordingly:

  76.  *  - \c EINVAL Unsupported format requested.

  77.  *  - \c ENOMEM Not enough memory to allocate output buffer.

  78.  *

  79.  *  \param cv A libcaca canvas

  80.  *  \param format A string describing the requested output format.

  81.  *  \param bytes A pointer to a size_t where the number of allocated bytes

  82.  *         will be written.

  83.  *  \return A pointer to the exported memory area, or NULL in case of error.

  84.  */

  85. void *caca_export_memory(caca_canvas_t const *cv, char const *format,

  86.                           size_t *bytes)

  87. {

  88.     if(!strcasecmp("caca", format))

  89.         return export_caca(cv, bytes);

  90. 

  91.     if(!strcasecmp("ansi", format))

  92.         return export_ansi(cv, bytes);

  93. 

  94.     if(!strcasecmp("utf8", format))

  95.         return export_utf8(cv, bytes, 0);

  96. 

  97.     if(!strcasecmp("utf8cr", format))

  98.         return export_utf8(cv, bytes, 1);

  99. 

  100.     if(!strcasecmp("html", format))

  101.         return export_html(cv, bytes);

  102. 

  103.     if(!strcasecmp("html3", format))

  104.         return export_html3(cv, bytes);

  105. 

  106.     if(!strcasecmp("bbfr", format))

  107.         return export_bbfr(cv, bytes);

  108. 

  109.     if(!strcasecmp("irc", format))

  110.         return export_irc(cv, bytes);

  111. 

  112.     if(!strcasecmp("ps", format))

  113.         return export_ps(cv, bytes);

  114. 

  115.     if(!strcasecmp("svg", format))

  116.         return export_svg(cv, bytes);

  117. 

  118.     if(!strcasecmp("tga", format))

  119.         return export_tga(cv, bytes);

  120. 

  121.     seterrno(EINVAL);

  122.     return NULL;

  123. }

  124. 

  125. /** \brief Get available export formats

  126.  *

  127.  *  Return a list of available export formats. The list is a NULL-terminated

  128.  *  array of strings, interleaving a string containing the internal value for

  129.  *  the export format, to be used with caca_export_memory(), and a string

  130.  *  containing the natural language description for that export format.

  131.  *

  132.  *  This function never fails.

  133.  *

  134.  *  \return An array of strings.

  135.  */

  136. char const * const * caca_get_export_list(void)

  137. {

  138.     static char const * const list[] =

  139.     {

  140.         "caca", "native libcaca format",

  141.         "ansi", "ANSI",

  142.         "utf8", "UTF-8 with ANSI escape codes",

  143.         "utf8cr", "UTF-8 with ANSI escape codes and MS-DOS \\r",

  144.         "html", "HTML",

  145.         "html3", "backwards-compatible HTML",

  146.         "bbfr", "BBCode (French)",

  147.         "irc", "IRC with mIRC colours",

  148.         "ps", "PostScript document",

  149.         "svg", "SVG vector image",

  150.         "tga", "TGA image",

  151.         NULL, NULL

  152.     };

  153. 

  154.     return list;

  155. }

  156. 

  157. /*

  158.  * XXX: the following functions are local.

  159.  */

  160. 

  161. /* Generate a native libcaca canvas file. */

  162. static void *export_caca(caca_canvas_t const *cv, size_t *bytes)

  163. {

  164.     char *data, *cur;

  165.     int f, n;

  166. 

  167.     /* 52 bytes for the header:

  168.      *  - 4 bytes for "\xCA\xCA" + "CV"

  169.      *  - 16 bytes for the canvas header

  170.      *  - 32 bytes for the frame info

  171.      * 8 bytes for each character cell */

  172.     *bytes = 20 + (32 + 8 * cv->width * cv->height) * cv->framecount;

  173.     cur = data = malloc(*bytes);

  174. 

  175.     /* magic */

  176.     cur += sprintf(cur, "%s", "\xCA\xCA" "CV");

  177. 

  178.     /* canvas_header */

  179.     cur += sprintu32(cur, 16 + 32 * cv->framecount);

  180.     cur += sprintu32(cur, cv->width * cv->height * 8 * cv->framecount);

  181.     cur += sprintu16(cur, 0x0001);

  182.     cur += sprintu32(cur, cv->framecount);

  183.     cur += sprintu16(cur, 0x0000);

  184. 

  185.     /* frame_info */

  186.     for(f = 0; f < cv->framecount; f++)

  187.     {

  188.         cur += sprintu32(cur, cv->width);

  189.         cur += sprintu32(cur, cv->height);

  190.         cur += sprintu32(cur, 0);

  191.         cur += sprintu32(cur, cv->curattr);

  192.         cur += sprintu32(cur, cv->frames[f].x);

  193.         cur += sprintu32(cur, cv->frames[f].y);

  194.         cur += sprintu32(cur, cv->frames[f].handlex);

  195.         cur += sprintu32(cur, cv->frames[f].handley);

  196.     }

  197. 

  198.     /* canvas_data */

  199.     for(f = 0; f < cv->framecount; f++)

  200.     {

  201.         uint32_t *attrs = cv->frames[f].attrs;

  202.         uint32_t *chars = cv->frames[f].chars;

  203. 

  204.         for(n = cv->height * cv->width; n--; )

  205.         {

  206.             cur += sprintu32(cur, *chars++);

  207.             cur += sprintu32(cur, *attrs++);

  208.         }

  209.     }

  210. 

  211.     return data;

  212. }

  213. 

  214. /* Generate UTF-8 representation of current canvas. */

  215. static void *export_utf8(caca_canvas_t const *cv, size_t *bytes,

  216.                          int cr)

  217. {

  218.     static uint8_t const palette[] =

  219.     {

  220.         0,  4,  2,  6, 1,  5,  3,  7,

  221.         8, 12, 10, 14, 9, 13, 11, 15

  222.     };

  223. 

  224.     char *data, *cur;

  225.     int x, y;

  226. 

  227.     /* 23 bytes assumed for max length per pixel ('\e[5;1;3x;4y;9x;10ym' plus

  228.      * 4 max bytes for a UTF-8 character).

  229.      * Add height*9 to that (zeroes color at the end and jump to next line) */

  230.     *bytes = (cv->height * 9) + (cv->width * cv->height * 23);

  231.     cur = data = malloc(*bytes);

  232. 

  233.     for(y = 0; y < cv->height; y++)

  234.     {

  235.         uint32_t *lineattr = cv->attrs + y * cv->width;

  236.         uint32_t *linechar = cv->chars + y * cv->width;

  237. 

  238.         uint8_t prevfg = 0x10;

  239.         uint8_t prevbg = 0x10;

  240. 

  241.         for(x = 0; x < cv->width; x++)

  242.         {

  243.             uint32_t attr = lineattr[x];

  244.             uint32_t ch = linechar[x];

  245.             uint8_t ansifg, ansibg, fg, bg;

  246. 

  247.             if(ch == CACA_MAGIC_FULLWIDTH)

  248.                 continue;

  249. 

  250.             ansifg = caca_attr_to_ansi_fg(attr);

  251.             ansibg = caca_attr_to_ansi_bg(attr);

  252. 

  253.             fg = ansifg < 0x10 ? palette[ansifg] : 0x10;

  254.             bg = ansibg < 0x10 ? palette[ansibg] : 0x10;

  255. 

  256.             /* TODO: the [0 could be omitted in some cases */

  257.             if(fg != prevfg || bg != prevbg)

  258.             {

  259.                 cur += sprintf(cur, "\033[0");

  260. 

  261.                 if(fg < 8)

  262.                     cur += sprintf(cur, ";3%d", fg);

  263.                 else if(fg < 16)

  264.                     cur += sprintf(cur, ";1;3%d;9%d", fg - 8, fg - 8);

  265. 

  266.                 if(bg < 8)

  267.                     cur += sprintf(cur, ";4%d", bg);

  268.                 else if(bg < 16)

  269.                     cur += sprintf(cur, ";5;4%d;10%d", bg - 8, bg - 8);

  270. 

  271.                 cur += sprintf(cur, "m");

  272.             }

  273. 

  274.             cur += caca_utf32_to_utf8(cur, ch);

  275. 

  276.             prevfg = fg;

  277.             prevbg = bg;

  278.         }

  279. 

  280.         if(prevfg != 0x10 || prevbg != 0x10)

  281.             cur += sprintf(cur, "\033[0m");

  282. 

  283.         cur += sprintf(cur, cr ? "\r\n" : "\n");

  284.     }

  285. 

  286.     /* Crop to really used size */

  287.     debug("utf8 export: alloc %lu bytes, realloc %lu",

  288.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  289.     *bytes = (uintptr_t)(cur - data);

  290.     data = realloc(data, *bytes);

  291. 

  292.     return data;

  293. }

  294. 

  295. /* Generate ANSI representation of current canvas. */

  296. static void *export_ansi(caca_canvas_t const *cv, size_t *bytes)

  297. {

  298.     static uint8_t const palette[] =

  299.     {

  300.         0,  4,  2,  6, 1,  5,  3,  7,

  301.         8, 12, 10, 14, 9, 13, 11, 15

  302.     };

  303. 

  304.     char *data, *cur;

  305.     int x, y;

  306. 

  307.     uint8_t prevfg = -1;

  308.     uint8_t prevbg = -1;

  309. 

  310.     /* 16 bytes assumed for max length per pixel ('\e[5;1;3x;4ym' plus

  311.      * 1 byte for a CP437 character).

  312.      * Add height*9 to that (zeroes color at the end and jump to next line) */

  313.     *bytes = (cv->height * 9) + (cv->width * cv->height * 16);

  314.     cur = data = malloc(*bytes);

  315. 

  316.     for(y = 0; y < cv->height; y++)

  317.     {

  318.         uint32_t *lineattr = cv->attrs + y * cv->width;

  319.         uint32_t *linechar = cv->chars + y * cv->width;

  320. 

  321.         for(x = 0; x < cv->width; x++)

  322.         {

  323.             uint8_t ansifg = caca_attr_to_ansi_fg(lineattr[x]);

  324.             uint8_t ansibg = caca_attr_to_ansi_bg(lineattr[x]);

  325.             uint8_t fg = ansifg < 0x10 ? palette[ansifg] : CACA_LIGHTGRAY;

  326.             uint8_t bg = ansibg < 0x10 ? palette[ansibg] : CACA_BLACK;

  327.             uint32_t ch = linechar[x];

  328. 

  329.             if(ch == CACA_MAGIC_FULLWIDTH)

  330.                 ch = '?';

  331. 

  332.             if(fg != prevfg || bg != prevbg)

  333.             {

  334.                 cur += sprintf(cur, "\033[0;");

  335. 

  336.                 if(fg < 8)

  337.                     if(bg < 8)

  338.                         cur += sprintf(cur, "3%d;4%dm", fg, bg);

  339.                     else

  340.                         cur += sprintf(cur, "5;3%d;4%dm", fg, bg - 8);

  341.                 else

  342.                     if(bg < 8)

  343.                         cur += sprintf(cur, "1;3%d;4%dm", fg - 8, bg);

  344.                     else

  345.                         cur += sprintf(cur, "5;1;3%d;4%dm", fg - 8, bg - 8);

  346.             }

  347. 

  348.             *cur++ = caca_utf32_to_cp437(ch);

  349. 

  350.             prevfg = fg;

  351.             prevbg = bg;

  352.         }

  353. 

  354.         if(cv->width == 80)

  355.         {

  356.             cur += sprintf(cur, "\033[s\n\033[u");

  357.         }

  358.         else

  359.         {

  360.             cur += sprintf(cur, "\033[0m\r\n");

  361.             prevfg = -1;

  362.             prevbg = -1;

  363.         }

  364.     }

  365. 

  366.     /* Crop to really used size */

  367.     debug("ansi export: alloc %lu bytes, realloc %lu",

  368.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  369.     *bytes = (uintptr_t)(cur - data);

  370.     data = realloc(data, *bytes);

  371. 

  372.     return data;

  373. }

  374. 

  375. /* Generate HTML representation of current canvas. */

  376. static void *export_html(caca_canvas_t const *cv, size_t *bytes)

  377. {

  378.     char *data, *cur;

  379.     int x, y, len;

  380. 

  381.     /* The HTML header: less than 1000 bytes

  382.      * A line: 7 chars for "<br />\n"

  383.      * A glyph: 47 chars for "<span style="color:#xxx;background-color:#xxx">"

  384.      *          83 chars for ";font-weight..."

  385.      *          up to 9 chars for "&#xxxxxx;", far less for pure ASCII

  386.      *          7 chars for "</span>" */

  387.     *bytes = 1000 + cv->height * (7 + cv->width * (47 + 83 + 9 + 7));

  388.     cur = data = malloc(*bytes);

  389. 

  390.     /* HTML header */

  391.     cur += sprintf(cur, "<html><head>\n");

  392.     cur += sprintf(cur, "<title>Generated by libcaca %s</title>\n",

  393.                         caca_get_version());

  394.     cur += sprintf(cur, "</head><body>\n");

  395. 

  396.     cur += sprintf(cur, "<div cellpadding='0' cellspacing='0' style='%s'>\n",

  397.                         "font-family: monospace, fixed; font-weight: bold;");

  398. 

  399.     for(y = 0; y < cv->height; y++)

  400.     {

  401.         uint32_t *lineattr = cv->attrs + y * cv->width;

  402.         uint32_t *linechar = cv->chars + y * cv->width;

  403. 

  404.         for(x = 0; x < cv->width; x += len)

  405.         {

  406.             cur += sprintf(cur, "<span style=\"");

  407.             if(caca_attr_to_ansi_fg(lineattr[x]) < 0x10)

  408.                 cur += sprintf(cur, ";color:#%.03x",

  409.                                caca_attr_to_rgb12_fg(lineattr[x]));

  410.             if(caca_attr_to_ansi_bg(lineattr[x]) < 0x10)

  411.                 cur += sprintf(cur, ";background-color:#%.03x",

  412.                                caca_attr_to_rgb12_bg(lineattr[x]));

  413.             if(lineattr[x] & CACA_BOLD)

  414.                 cur += sprintf(cur, ";font-weight:bold");

  415.             if(lineattr[x] & CACA_ITALICS)

  416.                 cur += sprintf(cur, ";font-style:italic");

  417.             if(lineattr[x] & CACA_UNDERLINE)

  418.                 cur += sprintf(cur, ";text-decoration:underline");

  419.             if(lineattr[x] & CACA_BLINK)

  420.                 cur += sprintf(cur, ";text-decoration:blink");

  421.             cur += sprintf(cur, "\">");

  422. 

  423.             for(len = 0;

  424.                 x + len < cv->width && lineattr[x + len] == lineattr[x];

  425.                 len++)

  426.             {

  427.                 if(linechar[x + len] == CACA_MAGIC_FULLWIDTH)

  428.                     ;

  429.                 else if(linechar[x + len] <= 0x00000020)

  430.                     cur += sprintf(cur, "&nbsp;");

  431.                 else if(linechar[x + len] < 0x00000080)

  432.                     cur += sprintf(cur, "%c", (uint8_t)linechar[x + len]);

  433.                 else

  434.                     cur += sprintf(cur, "&#%i;",

  435.                                    (unsigned int)linechar[x + len]);

  436.             }

  437.             cur += sprintf(cur, "</span>");

  438.         }

  439.         /* New line */

  440.         cur += sprintf(cur, "<br />\n");

  441.     }

  442. 

  443.     cur += sprintf(cur, "</div></body></html>\n");

  444. 

  445.     /* Crop to really used size */

  446.     debug("html export: alloc %lu bytes, realloc %lu",

  447.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  448.     *bytes = (uintptr_t)(cur - data);

  449.     data = realloc(data, *bytes);

  450. 

  451.     return data;

  452. }

  453. 

  454. /* Export an HTML3 document. This function is way bigger than export_html(),

  455.  * but permits viewing in old browsers (or limited ones such as links). It

  456.  * will not work under gecko (mozilla rendering engine) unless you set a

  457.  * correct header. */

  458. static void *export_html3(caca_canvas_t const *cv, size_t *bytes)

  459. {

  460.     char *data, *cur;

  461.     int x, y, len;

  462.     int maxcols;

  463. 

  464.     /* Table */

  465.     maxcols = 0;

  466.     for(y = 0; y < cv->height; y++)

  467.     {

  468.         uint32_t *linechar = cv->chars + y * cv->width;

  469.         int cols = 0;

  470. 

  471.         for(x = 0; x < cv->width; x++)

  472.         {

  473.             if(linechar[x] == 0x00000009)

  474.                 while((cols + 1) % 8)

  475.                     cols ++;

  476.             cols ++;

  477.         }

  478.         if (cols > maxcols)

  479.             maxcols = cols;

  480.     }

  481.     

  482.     /* The HTML table markup: less than 1000 bytes

  483.      * A line: 10 chars for "<tr></tr>\n"

  484.      * A glyph: up to 48 chars for "<td bgcolor=\"#xxxxxx\"><tt><font color=\"#xxxxxx\">"

  485.      *          up to 36 chars for "<b><i><u><blink></blink></u></i></b>"

  486.      *          up to 9 chars for "&#xxxxxx;" (far less for pure ASCII)

  487.      *          17 chars for "</font></tt></td>" */

  488.     *bytes = 1000 + cv->height * (10 + maxcols * (48 + 36 + 9 + 17));

  489.     cur = data = malloc(*bytes);

  490. 

  491.     cur += sprintf(cur, "<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" summary=\"[libcaca canvas html3 export]\">\n");

  492. 

  493.     for(y = 0; y < cv->height; y++)

  494.     {

  495.         uint32_t *lineattr = cv->attrs + y * cv->width;

  496.         uint32_t *linechar = cv->chars + y * cv->width;

  497.         int taboff = 0;

  498. 

  499.         cur += sprintf(cur, "<tr>");

  500. 

  501.         for(x = 0; x < cv->width; x += len)

  502.         {

  503.             int i, needfont = 0;

  504.             int thistab = 0;

  505. 

  506.             /* Use colspan option to factor cells with same attributes

  507.              * (see below) */

  508.             len = 1;

  509.             while((x + len < cv->width)

  510.                   &&

  511.                   (caca_attr_to_ansi_bg(lineattr[x + len])

  512.                    ==

  513.                    caca_attr_to_ansi_bg(lineattr[x]))

  514.                   &&

  515.                   ((caca_attr_to_ansi_bg(lineattr[x]) < 0x10)

  516.                    ?

  517.                    (_caca_attr_to_rgb24bg(lineattr[x + len])

  518.                     &&

  519.                     _caca_attr_to_rgb24bg(lineattr[x]))

  520.                    :

  521.                    1))

  522.                 len++;

  523. 

  524.             for(i = 0; i < len; i++)

  525.                 if(linechar[x + i] == 0x00000009)

  526.                     while((x + i + taboff + thistab + 1) % 8)

  527.                         thistab ++;

  528. 

  529.             cur += sprintf(cur, "<td");

  530. 

  531.             if(caca_attr_to_ansi_bg(lineattr[x]) < 0x10)

  532.                 cur += sprintf(cur, " bgcolor=\"#%.06lx\"", (unsigned long int)

  533.                                _caca_attr_to_rgb24bg(lineattr[x]));

  534. 

  535.             if((len + thistab) > 1)

  536.                 cur += sprintf(cur, " colspan=\"%d\"", len + thistab);

  537. 

  538.             cur += sprintf(cur, ">");

  539. 

  540.             cur += sprintf(cur, "<tt>");

  541. 

  542.             for(i = 0; i < len; i++)

  543.             {

  544.                 if((! i) || (lineattr[x + i] != lineattr[x + i - 1]))

  545.                 {

  546.                     needfont = caca_attr_to_ansi_fg(lineattr[x + i]) < 0x10;

  547. 

  548.                     if(needfont)

  549.                         cur += sprintf(cur, "<font color=\"#%.06lx\">", (unsigned long int)

  550.                                        _caca_attr_to_rgb24fg(lineattr[x + i]));

  551. 

  552.                     if(lineattr[x + i] & CACA_BOLD)

  553.                         cur += sprintf(cur, "<b>");

  554.                     if(lineattr[x + i] & CACA_ITALICS)

  555.                         cur += sprintf(cur, "<i>");

  556.                     if(lineattr[x + i] & CACA_UNDERLINE)

  557.                         cur += sprintf(cur, "<u>");

  558.                     if(lineattr[x + i] & CACA_BLINK)

  559.                         cur += sprintf(cur, "<blink>");

  560.                 }

  561. 

  562.                 if(linechar[x + i] == CACA_MAGIC_FULLWIDTH)

  563.                     ;

  564.                 else if(linechar[x + i] <= 0x00000020)

  565.                 {

  566.                     /* Control characters and space converted to

  567.                      * U+00A0 NO-BREAK SPACE, a.k.a. "&nbsp;" in HTML,

  568.                      * but we use the equivalent numeric character

  569.                      * reference &#160; so this will work in plain

  570.                      * XHTML with no DTD too. We also expand tabs

  571.                      * here, since they are not honored in HTML. */

  572.                     if(linechar[x + i] == 0x00000009)

  573.                     {

  574.                         while((x + i + taboff + 1) % 8)

  575.                         {

  576.                             cur += sprintf(cur, "&#160;");

  577.                             taboff ++;

  578.                         }

  579.                     }

  580.                     cur += sprintf(cur, "&#160;");

  581.                 }

  582.                 else if(linechar[x + i] == '&')

  583.                     cur += sprintf(cur, "&amp;");

  584.                 else if(linechar[x + i] == '<')

  585.                     cur += sprintf(cur, "&lt;");

  586.                 else if(linechar[x + i] == '>')

  587.                     cur += sprintf(cur, "&gt;");

  588.                 else if(linechar[x + i] == '\"')

  589.                     cur += sprintf(cur, "&quot;");

  590.                 else if(linechar[x + i] == '\'')

  591.                     cur += sprintf(cur, "&#39;");

  592.                 else if(linechar[x + i] < 0x00000080)

  593.                     cur += sprintf(cur, "%c", (uint8_t)linechar[x + i]);

  594.                 else

  595.                     cur += sprintf(cur, "&#%i;", (unsigned int)linechar[x + i]);

  596. 

  597.                 if (((i + 1) == len) || (lineattr[x + i + 1] != lineattr[x + i]))

  598.                 {

  599.                     if(lineattr[x + i] & CACA_BLINK)

  600.                         cur += sprintf(cur, "</blink>");

  601.                     if(lineattr[x + i] & CACA_UNDERLINE)

  602.                         cur += sprintf(cur, "</u>");

  603.                     if(lineattr[x + i] & CACA_ITALICS)

  604.                         cur += sprintf(cur, "</i>");

  605.                     if(lineattr[x + i] & CACA_BOLD)

  606.                         cur += sprintf(cur, "</b>");

  607. 

  608.                     if(needfont)

  609.                         cur += sprintf(cur, "</font>");

  610.                 }

  611.             }

  612. 

  613.             cur += sprintf(cur, "</tt>");

  614.             cur += sprintf(cur, "</td>");

  615.         }

  616.         cur += sprintf(cur, "</tr>\n");

  617.     }

  618. 

  619.     /* Footer */

  620.     cur += sprintf(cur, "</table>\n");

  621. 

  622.     /* Crop to really used size */

  623.     debug("html3 export: alloc %lu bytes, realloc %lu",

  624.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  625.     *bytes = (uintptr_t)(cur - data);

  626.     data = realloc(data, *bytes);

  627. 

  628.     return data;

  629. }

  630. 

  631. static void *export_bbfr(caca_canvas_t const *cv, size_t *bytes)

  632. {

  633.     char *data, *cur;

  634.     int x, y, len;

  635. 

  636.     /* The font markup: less than 100 bytes

  637.      * A line: 1 char for "\n"

  638.      * A glyph: 22 chars for "[f=#xxxxxx][c=#xxxxxx]"

  639.      *          up to 21 chars for "[g][i][s][/s][/i][/g]"

  640.      *          up to 6 chars for the UTF-8 glyph

  641.      *          8 chars for "[/c][/f]" */

  642.     *bytes = 100 + cv->height * (1 + cv->width * (22 + 21 + 6 + 8));

  643.     cur = data = malloc(*bytes);

  644. 

  645.     /* Table */

  646.     cur += sprintf(cur, "[font=Courier New]");

  647. 

  648.     for(y = 0; y < cv->height; y++)

  649.     {

  650.         uint32_t *lineattr = cv->attrs + y * cv->width;

  651.         uint32_t *linechar = cv->chars + y * cv->width;

  652. 

  653.         for(x = 0; x < cv->width; x += len)

  654.         {

  655.             int i, needback, needfront;

  656. 

  657.             /* Use colspan option to factor cells with same attributes

  658.              * (see below) */

  659.             len = 1;

  660.             if(linechar[x] == ' ')

  661.                 while(x + len < cv->width && lineattr[x + len] == lineattr[x]

  662.                         && linechar[x] == ' ')

  663.                     len++;

  664.             else

  665.                 while(x + len < cv->width && lineattr[x + len] == lineattr[x]

  666.                         && linechar[x] != ' ')

  667.                     len++;

  668. 

  669.             needback = caca_attr_to_ansi_bg(lineattr[x]) < 0x10;

  670.             needfront = caca_attr_to_ansi_fg(lineattr[x]) < 0x10;

  671. 

  672.             if(needback)

  673.                 cur += sprintf(cur, "[f=#%.06lx]", (unsigned long int)

  674.                                _caca_attr_to_rgb24bg(lineattr[x]));

  675. 

  676.             if(linechar[x] == ' ')

  677.                 cur += sprintf(cur, "[c=#%.06lx]", (unsigned long int)

  678.                                _caca_attr_to_rgb24bg(lineattr[x]));

  679.             else if(needfront)

  680.                 cur += sprintf(cur, "[c=#%.06lx]", (unsigned long int)

  681.                                _caca_attr_to_rgb24fg(lineattr[x]));

  682. 

  683.             if(lineattr[x] & CACA_BOLD)

  684.                 cur += sprintf(cur, "[g]");

  685.             if(lineattr[x] & CACA_ITALICS)

  686.                 cur += sprintf(cur, "[i]");

  687.             if(lineattr[x] & CACA_UNDERLINE)

  688.                 cur += sprintf(cur, "[s]");

  689.             if(lineattr[x] & CACA_BLINK)

  690.                 ; /* FIXME */

  691. 

  692.             for(i = 0; i < len; i++)

  693.             {

  694.                 if(linechar[x + i] == CACA_MAGIC_FULLWIDTH)

  695.                     ;

  696.                 else if(linechar[x + i] == ' ')

  697.                     *cur++ = '_';

  698.                 else

  699.                     cur += caca_utf32_to_utf8(cur, linechar[x + i]);

  700.             }

  701. 

  702.             if(lineattr[x] & CACA_BLINK)

  703.                 ; /* FIXME */

  704.             if(lineattr[x] & CACA_UNDERLINE)

  705.                 cur += sprintf(cur, "[/s]");

  706.             if(lineattr[x] & CACA_ITALICS)

  707.                 cur += sprintf(cur, "[/i]");

  708.             if(lineattr[x] & CACA_BOLD)

  709.                 cur += sprintf(cur, "[/g]");

  710. 

  711.             if(linechar[x] == ' ' || needfront)

  712.                 cur += sprintf(cur, "[/c]");

  713.             if(needback)

  714.                 cur += sprintf(cur, "[/f]");

  715.         }

  716.         cur += sprintf(cur, "\n");

  717.     }

  718. 

  719.     /* Footer */

  720.     cur += sprintf(cur, "[/font]\n");

  721. 

  722.     /* Crop to really used size */

  723.     debug("bbfr export: alloc %lu bytes, realloc %lu",

  724.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  725.     *bytes = (uintptr_t)(cur - data);

  726.     data = realloc(data, *bytes);

  727. 

  728.     return data;

  729. }

  730. 

  731. /* Export a text file with IRC colours */

  732. static void *export_irc(caca_canvas_t const *cv, size_t *bytes)

  733. {

  734.     static uint8_t const palette[] =

  735.     {

  736.         1, 2, 3, 10, 5, 6, 7, 15, /* Dark */

  737.         14, 12, 9, 11, 4, 13, 8, 0, /* Light */

  738.     };

  739. 

  740.     char *data, *cur;

  741.     int x, y;

  742. 

  743.     /* 14 bytes assumed for max length per pixel. Worst case scenario:

  744.      * ^Cxx,yy   6 bytes

  745.      * ^B^B      2 bytes

  746.      * ch        6 bytes

  747.      * 3 bytes for max length per line. Worst case scenario:

  748.      * <spc>     1 byte (for empty lines)

  749.      * \r\n      2 bytes

  750.      * In real life, the average bytes per pixel value will be around 5.

  751.      */

  752. 

  753.     *bytes = 2 + cv->height * (3 + cv->width * 14);

  754.     cur = data = malloc(*bytes);

  755. 

  756.     for(y = 0; y < cv->height; y++)

  757.     {

  758.         uint32_t *lineattr = cv->attrs + y * cv->width;

  759.         uint32_t *linechar = cv->chars + y * cv->width;

  760. 

  761.         uint8_t prevfg = 0x10;

  762.         uint8_t prevbg = 0x10;

  763. 

  764.         for(x = 0; x < cv->width; x++)

  765.         {

  766.             uint32_t attr = lineattr[x];

  767.             uint32_t ch = linechar[x];

  768.             uint8_t ansifg, ansibg, fg, bg;

  769. 

  770.             if(ch == CACA_MAGIC_FULLWIDTH)

  771.                 continue;

  772. 

  773.             ansifg = caca_attr_to_ansi_fg(attr);

  774.             ansibg = caca_attr_to_ansi_bg(attr);

  775. 

  776.             fg = ansifg < 0x10 ? palette[ansifg] : 0x10;

  777.             bg = ansibg < 0x10 ? palette[ansibg] : 0x10;

  778. 

  779.             /* TODO: optimise series of same fg / same bg

  780.              *       don't change fg value if ch == ' '

  781.              *       make sure the \x03,%d trick works everywhere */

  782.             if(bg != prevbg || fg != prevfg)

  783.             {

  784.                 int need_escape = 0;

  785. 

  786.                 if(bg == 0x10)

  787.                 {

  788.                     if(fg == 0x10)

  789.                         cur += sprintf(cur, "\x0f");

  790.                     else

  791.                     {

  792.                         if(prevbg == 0x10)

  793.                             cur += sprintf(cur, "\x03%d", fg);

  794.                         else

  795.                             cur += sprintf(cur, "\x0f\x03%d", fg);

  796. 

  797.                         if(ch == (uint32_t)',')

  798.                             need_escape = 1;

  799.                     }

  800.                 }

  801.                 else

  802.                 {

  803.                     if(fg == 0x10)

  804.                         cur += sprintf(cur, "\x0f\x03,%d", bg);

  805.                     else

  806.                         cur += sprintf(cur, "\x03%d,%d", fg, bg);

  807.                 }

  808. 

  809.                 if(ch >= (uint32_t)'0' && ch <= (uint32_t)'9')

  810.                     need_escape = 1;

  811. 

  812.                 if(need_escape)

  813.                     cur += sprintf(cur, "\x02\x02");

  814.             }

  815. 

  816.             cur += caca_utf32_to_utf8(cur, ch);

  817.             prevfg = fg;

  818.             prevbg = bg;

  819.         }

  820. 

  821.         /* TODO: do the same the day we optimise whole lines above */

  822.         if(!cv->width)

  823.             *cur++ = ' ';

  824. 

  825.         *cur++ = '\r';

  826.         *cur++ = '\n';

  827.     }

  828. 

  829.     /* Crop to really used size */

  830.     debug("IRC export: alloc %lu bytes, realloc %lu",

  831.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  832.     *bytes = (uintptr_t)(cur - data);

  833.     data = realloc(data, *bytes);

  834. 

  835.     return data;

  836. }

  837. 

  838. /* Export a PostScript document. */

  839. static void *export_ps(caca_canvas_t const *cv, size_t *bytes)

  840. {

  841.     static char const *ps_header =

  842.         "%!\n"

  843.         "%% libcaca PDF export\n"

  844.         "%%LanguageLevel: 2\n"

  845.         "%%Pages: 1\n"

  846.         "%%DocumentData: Clean7Bit\n"

  847.         "/csquare {\n"

  848.         "  newpath\n"

  849.         "  0 0 moveto\n"

  850.         "  0 1 rlineto\n"

  851.         "  1 0 rlineto\n"

  852.         "  0 -1 rlineto\n"

  853.         "  closepath\n"

  854.         "  setrgbcolor\n"

  855.         "  fill\n"

  856.         "} def\n"

  857.         "/S {\n"

  858.         "  Show\n"

  859.         "} bind def\n"

  860.         "/Courier-Bold findfont\n"

  861.         "8 scalefont\n"

  862.         "setfont\n"

  863.         "gsave\n"

  864.         "6 10 scale\n";

  865. 

  866.     char *data, *cur;

  867.     int x, y;

  868. 

  869.     /* 200 is arbitrary but should be ok */

  870.     *bytes = strlen(ps_header) + 100 + cv->height * (32 + cv->width * 200);

  871.     cur = data = malloc(*bytes);

  872. 

  873.     /* Header */

  874.     cur += sprintf(cur, "%s", ps_header);

  875.     cur += sprintf(cur, "0 %d translate\n", cv->height);

  876. 

  877.     /* Background, drawn using csquare macro defined in header */

  878.     for(y = cv->height; y--; )

  879.     {

  880.         uint32_t *lineattr = cv->attrs + y * cv->width;

  881. 

  882.         for(x = 0; x < cv->width; x++)

  883.         {

  884.             uint8_t argb[8];

  885.             caca_attr_to_argb64(*lineattr++, argb);

  886.             cur += sprintf(cur, "1 0 translate\n %f %f %f csquare\n",

  887.                            (float)argb[1] * (1.0 / 0xf),

  888.                            (float)argb[2] * (1.0 / 0xf),

  889.                            (float)argb[3] * (1.0 / 0xf));

  890.         }

  891. 

  892.         /* Return to beginning of the line, and jump to the next one */

  893.         cur += sprintf(cur, "-%d 1 translate\n", cv->width);

  894.     }

  895. 

  896.     cur += sprintf(cur, "grestore\n"); /* Restore transformation matrix */

  897.     cur += sprintf(cur, "0 %d translate\n", cv->height*10);

  898. 

  899.     for(y = cv->height; y--; )

  900.     {

  901.         uint32_t *lineattr = cv->attrs + (cv->height - y - 1) * cv->width;

  902.         uint32_t *linechar = cv->chars + (cv->height - y - 1) * cv->width;

  903. 

  904.         for(x = 0; x < cv->width; x++)

  905.         {

  906.             uint8_t argb[8];

  907.             uint32_t ch = *linechar++;

  908. 

  909.             caca_attr_to_argb64(*lineattr++, argb);

  910. 

  911.             cur += sprintf(cur, "newpath\n");

  912.             cur += sprintf(cur, "%d %d moveto\n", (x + 1) * 6, y * 10 + 2);

  913.             cur += sprintf(cur, "%f %f %f setrgbcolor\n",

  914.                            (float)argb[5] * (1.0 / 0xf),

  915.                            (float)argb[6] * (1.0 / 0xf),

  916.                            (float)argb[7] * (1.0 / 0xf));

  917. 

  918.             if(ch < 0x00000020)

  919.                 cur += sprintf(cur, "(?) show\n");

  920.             else if(ch >= 0x00000080)

  921.                 cur += sprintf(cur, "(?) show\n");

  922.             else switch((uint8_t)(ch & 0x7f))

  923.             {

  924.                 case '\\':

  925.                 case '(':

  926.                 case ')':

  927.                     cur += sprintf(cur, "(\\%c) show\n", (uint8_t)ch);

  928.                     break;

  929.                 default:

  930.                     cur += sprintf(cur, "(%c) show\n", (uint8_t)ch);

  931.                     break;

  932.             }

  933.         }

  934.     }

  935. 

  936.     cur += sprintf(cur, "showpage\n");

  937. 

  938.     /* Crop to really used size */

  939.     debug("PS export: alloc %lu bytes, realloc %lu",

  940.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  941.     *bytes = (uintptr_t)(cur - data);

  942.     data = realloc(data, *bytes);

  943. 

  944.     return data;

  945. }

  946. 

  947. /* Export an SVG vector image */

  948. static void *export_svg(caca_canvas_t const *cv, size_t *bytes)

  949. {

  950.     static char const svg_header[] =

  951.         "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"

  952.         "<svg width=\"%d\" height=\"%d\" viewBox=\"0 0 %d %d\""

  953.         " xmlns=\"http://www.w3.org/2000/svg\""

  954.         " xmlns:xlink=\"http://www.w3.org/1999/xlink\""

  955.         " xml:space=\"preserve\" version=\"1.1\"  baseProfile=\"full\">\n";

  956. 

  957.     char *data, *cur;

  958.     int x, y;

  959. 

  960.     /* 200 is arbitrary but should be ok */

  961.     *bytes = strlen(svg_header) + 128 + cv->width * cv->height * 200;

  962.     cur = data = malloc(*bytes);

  963. 

  964.     /* Header */

  965.     cur += sprintf(cur, svg_header, cv->width * 6, cv->height * 10,

  966.                                     cv->width * 6, cv->height * 10);

  967. 

  968.     cur += sprintf(cur, " <g id=\"mainlayer\" font-size=\"10\""

  969.                         " style=\"font-family: monospace\">\n");

  970. 

  971.     /* Background */

  972.     for(y = 0; y < cv->height; y++)

  973.     {

  974.         uint32_t *lineattr = cv->attrs + y * cv->width;

  975. 

  976.         for(x = 0; x < cv->width; x++)

  977.         {

  978.             cur += sprintf(cur, "<rect style=\"fill:#%.03x\" x=\"%d\" y=\"%d\""

  979.                                 " width=\"6\" height=\"10\"/>\n",

  980.                                 caca_attr_to_rgb12_bg(*lineattr++),

  981.                                 x * 6, y * 10);

  982.         }

  983.     }

  984. 

  985.     /* Text */

  986.     for(y = 0; y < cv->height; y++)

  987.     {

  988.         uint32_t *lineattr = cv->attrs + y * cv->width;

  989.         uint32_t *linechar = cv->chars + y * cv->width;

  990. 

  991.         for(x = 0; x < cv->width; x++)

  992.         {

  993.             uint32_t ch = *linechar++;

  994. 

  995.             if(ch == ' ' || ch == CACA_MAGIC_FULLWIDTH)

  996.             {

  997.                 lineattr++;

  998.                 continue;

  999.             }

  1000. 

  1001.             cur += sprintf(cur, "<text style=\"fill:#%.03x\" "

  1002.                                 "x=\"%d\" y=\"%d\">",

  1003.                                 caca_attr_to_rgb12_fg(*lineattr++),

  1004.                                 x * 6, (y * 10) + 8);

  1005. 

  1006.             if(ch < 0x00000020)

  1007.                 *cur++ = '?';

  1008.             else if(ch > 0x0000007f)

  1009.                 cur += caca_utf32_to_utf8(cur, ch);

  1010.             else switch((uint8_t)ch)

  1011.             {

  1012.                 case '>': cur += sprintf(cur, "&gt;"); break;

  1013.                 case '<': cur += sprintf(cur, "&lt;"); break;

  1014.                 case '&': cur += sprintf(cur, "&amp;"); break;

  1015.                 default: *cur++ = ch; break;

  1016.             }

  1017.             cur += sprintf(cur, "</text>\n");

  1018.         }

  1019.     }

  1020. 

  1021.     cur += sprintf(cur, " </g>\n");

  1022.     cur += sprintf(cur, "</svg>\n");

  1023. 

  1024.     /* Crop to really used size */

  1025.     debug("SVG export: alloc %lu bytes, realloc %lu",

  1026.           (unsigned long int)*bytes, (unsigned long int)(cur - data));

  1027.     *bytes = (uintptr_t)(cur - data);

  1028.     data = realloc(data, *bytes);

  1029. 

  1030.     return data;

  1031. }

  1032. 

  1033. /* Export a TGA image */

  1034. static void *export_tga(caca_canvas_t const *cv, size_t *bytes)

  1035. {

  1036.     char const * const *fontlist;

  1037.     char *data, *cur;

  1038.     caca_font_t *f;

  1039.     int i, w, h;

  1040. 

  1041.     fontlist = caca_get_font_list();

  1042.     if(!fontlist[0])

  1043.     {

  1044.         seterrno(EINVAL);

  1045.         return NULL;

  1046.     }

  1047. 

  1048.     f = caca_load_font(fontlist[0], 0);

  1049. 

  1050.     w = caca_get_canvas_width(cv) * caca_get_font_width(f);

  1051.     h = caca_get_canvas_height(cv) * caca_get_font_height(f);

  1052. 

  1053.     *bytes = w * h * 4 + 18; /* 32 bpp + 18 bytes for the header */

  1054.     cur = data = malloc(*bytes);

  1055. 

  1056.     /* ID Length */

  1057.     cur += sprintf(cur, "%c", 0);

  1058.     /* Color Map Type: no colormap */

  1059.     cur += sprintf(cur, "%c", 0);

  1060.     /* Image Type: uncompressed truecolor */

  1061.     cur += sprintf(cur, "%c", 2);

  1062.     /* Color Map Specification: no color map */

  1063.     memset(cur, 0, 5); cur += 5;

  1064. 

  1065.     /* Image Specification */

  1066.     cur += sprintf(cur, "%c%c", 0, 0); /* X Origin */

  1067.     cur += sprintf(cur, "%c%c", 0, 0); /* Y Origin */

  1068.     cur += sprintf(cur, "%c%c", w & 0xff, w >> 8); /* Width */

  1069.     cur += sprintf(cur, "%c%c", h & 0xff, h >> 8); /* Height */

  1070.     cur += sprintf(cur, "%c", 32); /* Pixel Depth */

  1071.     cur += sprintf(cur, "%c", 40); /* Image Descriptor */

  1072. 

  1073.     /* Image ID: no ID */

  1074.     /* Color Map Data: no colormap */

  1075. 

  1076.     /* Image Data */

  1077.     caca_render_canvas(cv, f, cur, w, h, 4 * w);

  1078. 

  1079.     /* Swap bytes. What a waste of time. */

  1080.     for(i = 0; i < w * h * 4; i += 4)

  1081.     {

  1082.         char c;

  1083.         c = cur[i]; cur[i] = cur[i + 3]; cur[i + 3] = c;

  1084.         c = cur[i + 1]; cur[i + 1] = cur[i + 2]; cur[i + 2] = c;

  1085.     }

  1086. 

  1087.     caca_free_font(f);

  1088. 

  1089.     return data;

  1090. }

  1091. 

  1092. /*

  1093.  * XXX: The following functions are aliases.

  1094.  */

  1095. 

  1096. void *cucul_export_memory(cucul_canvas_t const *, char const *,

  1097.                           size_t *) CACA_ALIAS(caca_export_memory);

  1098. char const * const * cucul_get_export_list(void)

  1099.          CACA_ALIAS(caca_get_export_list);