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libcaca/cucul/export.c

887 行
27 KiB
原始文件 Blame 文件历史 

  1. /*

  2.  *  libcucul      Canvas for ultrafast compositing of Unicode letters

  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; you can redistribute it and/or

  10.  *  modify it under the terms of the Do What The Fuck You Want To

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

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

  13.  */

  14. 

  15. /*

  16.  *  This file contains various export functions

  17.  */

  18. 

  19. #include "config.h"

  20. #include "common.h"

  21. 

  22. #if !defined(__KERNEL__)

  23. #   if defined(HAVE_ERRNO_H)

  24. #       include <errno.h>

  25. #   endif

  26. #   include <stdlib.h>

  27. #   include <stdio.h>

  28. #   include <string.h>

  29. #endif

  30. 

  31. #include "cucul.h"

  32. #include "cucul_internals.h"

  33. 

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

  35. {

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

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

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

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

  40.     return 4;

  41. }

  42. 

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

  44. {

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

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

  47.     return 2;

  48. }

  49. 

  50. static void *export_caca(cucul_canvas_t *, unsigned long int *);

  51. static void *export_ansi(cucul_canvas_t *, unsigned long int *);

  52. static void *export_utf8(cucul_canvas_t *, unsigned long int *, int);

  53. static void *export_html(cucul_canvas_t *, unsigned long int *);

  54. static void *export_html3(cucul_canvas_t *, unsigned long int *);

  55. static void *export_irc(cucul_canvas_t *, unsigned long int *);

  56. static void *export_ps(cucul_canvas_t *, unsigned long int *);

  57. static void *export_svg(cucul_canvas_t *, unsigned long int *);

  58. static void *export_tga(cucul_canvas_t *, unsigned long int *);

  59. 

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

  61.  *

  62.  *  This function exports a libcucul canvas into various foreign formats such

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

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

  65.  *

  66.  *  Valid values for \c format are:

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

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

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

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

  71.  *    most navigators, including textmode ones.

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

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

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

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

  76.  *

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

  78.  *  - \c EINVAL Unsupported format requested.

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

  80.  *

  81.  *  \param cv A libcucul canvas

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

  83.  *  \param bytes A pointer to an unsigned long integer where the number of

  84.  *         allocated bytes will be written.

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

  86.  */

  87. void *cucul_export_memory(cucul_canvas_t *cv, char const *format,

  88.                           unsigned long int *bytes)

  89. {

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

  91.         return export_caca(cv, bytes);

  92. 

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

  94.         return export_ansi(cv, bytes);

  95. 

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

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

  98. 

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

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

  101. 

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

  103.         return export_html(cv, bytes);

  104. 

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

  106.         return export_html3(cv, bytes);

  107. 

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

  109.         return export_irc(cv, bytes);

  110. 

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

  112.         return export_ps(cv, bytes);

  113. 

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

  115.         return export_svg(cv, bytes);

  116. 

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

  118.         return export_tga(cv, bytes);

  119. 

  120. #if defined(HAVE_ERRNO_H)

  121.     errno = EINVAL;

  122. #endif

  123.     return NULL;

  124. }

  125. 

  126. /** \brief Get available export formats

  127.  *

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

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

  130.  *  the export format, to be used with cucul_export_memory(), and a string

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

  132.  *

  133.  *  This function never fails.

  134.  *

  135.  *  \return An array of strings.

  136.  */

  137. char const * const * cucul_get_export_list(void)

  138. {

  139.     static char const * const list[] =

  140.     {

  141.         "caca", "native libcaca format",

  142.         "ansi", "ANSI",

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

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

  145.         "html", "HTML",

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

  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(cucul_canvas_t *cv, unsigned long int *bytes)

  163. {

  164.     uint32_t *attrs = cv->attrs;

  165.     uint32_t *chars = cv->chars;

  166.     char *data, *cur;

  167.     unsigned int n;

  168. 

  169.     /* 52 bytes for the header:

  170.      *  - 4 bytes for "\xCA\xCA" + "CV"

  171.      *  - 16 bytes for the canvas header

  172.      *  - 32 bytes for the frame info

  173.      * 8 bytes for each character cell */

  174.     *bytes = 52 + 8 * cv->width * cv->height;

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

  176. 

  177.     /* magic */

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

  179. 

  180.     /* canvas_header */

  181.     cur += sprintu32(cur, 16 + 32 * 1);

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

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

  184.     cur += sprintu32(cur, 1);

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

  186. 

  187.     /* frame_info */

  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[0].x);

  193.     cur += sprintu32(cur, cv->frames[0].y);

  194.     cur += sprintu32(cur, cv->frames[0].handlex);

  195.     cur += sprintu32(cur, cv->frames[0].handley);

  196. 

  197.     /* canvas_data */

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

  199.     {

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

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

  202.     }

  203. 

  204.     return data;

  205. }

  206. 

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

  208. static void *export_utf8(cucul_canvas_t *cv, unsigned long int *bytes, int cr)

  209. {

  210.     static uint8_t const palette[] =

  211.     {

  212.         0,  4,  2,  6, 1,  5,  3,  7,

  213.         8, 12, 10, 14, 9, 13, 11, 15

  214.     };

  215. 

  216.     char *data, *cur;

  217.     unsigned int x, y;

  218. 

  219.     /* 23 bytes assumed for max length per pixel ('\e[5;1;3x;4y;9x;10ym' plus

  220.      * 4 max bytes for a UTF-8 character).

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

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

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

  224. 

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

  226.     {

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

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

  229. 

  230.         uint8_t prevfg = 0x10;

  231.         uint8_t prevbg = 0x10;

  232. 

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

  234.         {

  235.             uint32_t attr = lineattr[x];

  236.             uint32_t ch = linechar[x];

  237.             uint8_t ansifg, ansibg, fg, bg;

  238. 

  239.             if(ch == CUCUL_MAGIC_FULLWIDTH)

  240.                 continue;

  241. 

  242.             ansifg = cucul_attr_to_ansi_fg(attr);

  243.             ansibg = cucul_attr_to_ansi_bg(attr);

  244. 

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

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

  247. 

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

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

  250.             {

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

  252. 

  253.                 if(fg < 8)

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

  255.                 else if(fg < 16)

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

  257. 

  258.                 if(bg < 8)

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

  260.                 else if(bg < 16)

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

  262. 

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

  264.             }

  265. 

  266.             cur += cucul_utf32_to_utf8(cur, ch);

  267. 

  268.             prevfg = fg;

  269.             prevbg = bg;

  270.         }

  271. 

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

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

  274. 

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

  276.     }

  277. 

  278.     /* Crop to really used size */

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

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

  281. 

  282.     return data;

  283. }

  284. 

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

  286. static void *export_ansi(cucul_canvas_t *cv, unsigned long int *bytes)

  287. {

  288.     static uint8_t const palette[] =

  289.     {

  290.         0,  4,  2,  6, 1,  5,  3,  7,

  291.         8, 12, 10, 14, 9, 13, 11, 15

  292.     };

  293. 

  294.     char *data, *cur;

  295.     unsigned int x, y;

  296. 

  297.     uint8_t prevfg = -1;

  298.     uint8_t prevbg = -1;

  299. 

  300.     /* 16 bytes assumed for max length per pixel ('\e[5;1;3x;4ym' plus

  301.      * 1 byte for a CP437 character).

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

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

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

  305. 

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

  307.     {

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

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

  310. 

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

  312.         {

  313.             uint8_t ansifg = cucul_attr_to_ansi_fg(lineattr[x]);

  314.             uint8_t ansibg = cucul_attr_to_ansi_bg(lineattr[x]);

  315.             uint8_t fg = ansifg < 0x10 ? palette[ansifg] : CUCUL_LIGHTGRAY;

  316.             uint8_t bg = ansibg < 0x10 ? palette[ansibg] : CUCUL_BLACK;

  317.             uint32_t ch = linechar[x];

  318. 

  319.             if(ch == CUCUL_MAGIC_FULLWIDTH)

  320.                 ch = '?';

  321. 

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

  323.             {

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

  325. 

  326.                 if(fg < 8)

  327.                     if(bg < 8)

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

  329.                     else

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

  331.                 else

  332.                     if(bg < 8)

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

  334.                     else

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

  336.             }

  337. 

  338.             *cur++ = cucul_utf32_to_cp437(ch);

  339. 

  340.             prevfg = fg;

  341.             prevbg = bg;

  342.         }

  343. 

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

  345.         {

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

  347.         }

  348.         else

  349.         {

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

  351.             prevfg = -1;

  352.             prevbg = -1;

  353.         }

  354.     }

  355. 

  356.     /* Crop to really used size */

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

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

  359. 

  360.     return data;

  361. }

  362. 

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

  364. static void *export_html(cucul_canvas_t *cv, unsigned long int *bytes)

  365. {

  366.     char *data, *cur;

  367.     unsigned int x, y, len;

  368. 

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

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

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

  372.      *          83 chars for ";font-weight..."

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

  374.      *          7 chars for "</span>" */

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

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

  377. 

  378.     /* HTML header */

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

  380.     cur += sprintf(cur, "<title>Generated by libcaca %s</title>\n", VERSION);

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

  382. 

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

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

  385. 

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

  387.     {

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

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

  390. 

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

  392.         {

  393.             cur += sprintf(cur, "<span style=\"color:#%.03x;"

  394.                                 "background-color:#%.03x",

  395.                                 _cucul_attr_to_rgb12fg(lineattr[x]),

  396.                                 _cucul_attr_to_rgb12bg(lineattr[x]));

  397.             if(lineattr[x] & CUCUL_BOLD)

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

  399.             if(lineattr[x] & CUCUL_ITALICS)

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

  401.             if(lineattr[x] & CUCUL_UNDERLINE)

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

  403.             if(lineattr[x] & CUCUL_BLINK)

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

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

  406. 

  407.             for(len = 0;

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

  409.                 len++)

  410.             {

  411.                 if(linechar[x + len] == CUCUL_MAGIC_FULLWIDTH)

  412.                     ;

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

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

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

  416.                     cur += sprintf(cur, "%c",

  417.                                    (unsigned char)linechar[x + len]);

  418.                 else

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

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

  421.             }

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

  423.         }

  424.         /* New line */

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

  426.     }

  427. 

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

  429. 

  430.     /* Crop to really used size */

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

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

  433. 

  434.     return data;

  435. }

  436. 

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

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

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

  440.  * correct header. */

  441. static void *export_html3(cucul_canvas_t *cv, unsigned long int *bytes)

  442. {

  443.     char *data, *cur;

  444.     unsigned int x, y, len;

  445. 

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

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

  448.      * A glyph: 40 chars for "<td bgcolor=#xxxxxx><font color=#xxxxxx>"

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

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

  451.      *          12 chars for "</font></td>" */

  452.     *bytes = 1000 + cv->height * (10 + cv->width * (40 + 36 + 9 + 12));

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

  454. 

  455.     /* Table */

  456.     cur += sprintf(cur, "<table cols='%d' cellpadding='0' cellspacing='0'>\n",

  457.                         cv->height);

  458. 

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

  460.     {

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

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

  463. 

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

  465. 

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

  467.         {

  468.             unsigned int i;

  469. 

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

  471.              * (see below) */

  472.             len = 1;

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

  474.                 len++;

  475. 

  476.             cur += sprintf(cur, "<td bgcolor=#%.06lx", (unsigned long int)

  477.                            _cucul_attr_to_rgb24bg(lineattr[x]));

  478. 

  479.             if(len > 1)

  480.                 cur += sprintf(cur, " colspan=%d", len);

  481. 

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

  483.                            _cucul_attr_to_rgb24fg(lineattr[x]));

  484. 

  485.             if(lineattr[x] & CUCUL_BOLD)

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

  487.             if(lineattr[x] & CUCUL_ITALICS)

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

  489.             if(lineattr[x] & CUCUL_UNDERLINE)

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

  491.             if(lineattr[x] & CUCUL_BLINK)

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

  493. 

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

  495.             {

  496.                 if(linechar[x + i] == CUCUL_MAGIC_FULLWIDTH)

  497.                     ;

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

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

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

  501.                     cur += sprintf(cur, "%c", (unsigned char)linechar[x + i]);

  502.                 else

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

  504.             }

  505. 

  506.             if(lineattr[x] & CUCUL_BLINK)

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

  508.             if(lineattr[x] & CUCUL_UNDERLINE)

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

  510.             if(lineattr[x] & CUCUL_ITALICS)

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

  512.             if(lineattr[x] & CUCUL_BOLD)

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

  514. 

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

  516.         }

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

  518.     }

  519. 

  520.     /* Footer */

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

  522. 

  523.     /* Crop to really used size */

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

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

  526. 

  527.     return data;

  528. }

  529. 

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

  531. static void *export_irc(cucul_canvas_t *cv, unsigned long int *bytes)

  532. {

  533.     static uint8_t const palette[] =

  534.     {

  535.         1, 2, 3, 10, 5, 6, 7, 15, /* Dark */

  536.         14, 12, 9, 11, 4, 13, 8, 0, /* Light */

  537.     };

  538. 

  539.     char *data, *cur;

  540.     unsigned int x, y;

  541. 

  542.     /* 14 bytes assumed for max length per pixel. Worst case scenario:

  543.      * ^Cxx,yy   6 bytes

  544.      * ^B^B      2 bytes

  545.      * ch        6 bytes

  546.      * 3 bytes for max length per line. Worst case scenario:

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

  548.      * \r\n      2 bytes

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

  550.      */

  551. 

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

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

  554. 

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

  556.     {

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

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

  559. 

  560.         uint8_t prevfg = 0x10;

  561.         uint8_t prevbg = 0x10;

  562. 

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

  564.         {

  565.             uint32_t attr = lineattr[x];

  566.             uint32_t ch = linechar[x];

  567.             uint8_t ansifg, ansibg, fg, bg;

  568. 

  569.             if(ch == CUCUL_MAGIC_FULLWIDTH)

  570.                 continue;

  571. 

  572.             ansifg = cucul_attr_to_ansi_fg(attr);

  573.             ansibg = cucul_attr_to_ansi_bg(attr);

  574. 

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

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

  577. 

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

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

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

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

  582.             {

  583.                 int need_escape = 0;

  584. 

  585.                 if(bg == 0x10)

  586.                 {

  587.                     if(fg == 0x10)

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

  589.                     else

  590.                     {

  591.                         if(prevbg == 0x10)

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

  593.                         else

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

  595. 

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

  597.                             need_escape = 1;

  598.                     }

  599.                 }

  600.                 else

  601.                 {

  602.                     if(fg == 0x10)

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

  604.                     else

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

  606.                 }

  607. 

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

  609.                     need_escape = 1;

  610. 

  611.                 if(need_escape)

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

  613.             }

  614. 

  615.             cur += cucul_utf32_to_utf8(cur, ch);

  616.             prevfg = fg;

  617.             prevbg = bg;

  618.         }

  619. 

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

  621.         if(!cv->width)

  622.             *cur++ = ' ';

  623. 

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

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

  626.     }

  627. 

  628.     /* Crop to really used size */

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

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

  631. 

  632.     return data;

  633. }

  634. 

  635. /* Export a PostScript document. */

  636. static void *export_ps(cucul_canvas_t *cv, unsigned long int *bytes)

  637. {

  638.     static char const *ps_header =

  639.         "%!\n"

  640.         "%% libcaca PDF export\n"

  641.         "%%LanguageLevel: 2\n"

  642.         "%%Pages: 1\n"

  643.         "%%DocumentData: Clean7Bit\n"

  644.         "/csquare {\n"

  645.         "  newpath\n"

  646.         "  0 0 moveto\n"

  647.         "  0 1 rlineto\n"

  648.         "  1 0 rlineto\n"

  649.         "  0 -1 rlineto\n"

  650.         "  closepath\n"

  651.         "  setrgbcolor\n"

  652.         "  fill\n"

  653.         "} def\n"

  654.         "/S {\n"

  655.         "  Show\n"

  656.         "} bind def\n"

  657.         "/Courier-Bold findfont\n"

  658.         "8 scalefont\n"

  659.         "setfont\n"

  660.         "gsave\n"

  661.         "6 10 scale\n";

  662. 

  663.     char *data, *cur;

  664.     unsigned int x, y;

  665. 

  666.     /* 200 is arbitrary but should be ok */

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

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

  669. 

  670.     /* Header */

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

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

  673. 

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

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

  676.     {

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

  678. 

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

  680.         {

  681.             uint8_t argb[8];

  682.             _cucul_attr_to_argb4(*lineattr++, argb);

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

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

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

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

  687.         }

  688. 

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

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

  691.     }

  692. 

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

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

  695. 

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

  697.     {

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

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

  700. 

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

  702.         {

  703.             uint8_t argb[8];

  704.             uint32_t ch = *linechar++;

  705. 

  706.             _cucul_attr_to_argb4(*lineattr++, argb);

  707. 

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

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

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

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

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

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

  714. 

  715.             if(ch < 0x00000020)

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

  717.             else if(ch >= 0x00000080)

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

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

  720.             {

  721.                 case '\\':

  722.                 case '(':

  723.                 case ')':

  724.                     cur += sprintf(cur, "(\\%c) show\n", (unsigned char)ch);

  725.                     break;

  726.                 default:

  727.                     cur += sprintf(cur, "(%c) show\n", (unsigned char)ch);

  728.                     break;

  729.             }

  730.         }

  731.     }

  732. 

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

  734. 

  735.     /* Crop to really used size */

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

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

  738. 

  739.     return data;

  740. }

  741. 

  742. /* Export an SVG vector image */

  743. static void *export_svg(cucul_canvas_t *cv, unsigned long int *bytes)

  744. {

  745.     static char const svg_header[] =

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

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

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

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

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

  751. 

  752.     char *data, *cur;

  753.     unsigned int x, y;

  754. 

  755.     /* 200 is arbitrary but should be ok */

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

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

  758. 

  759.     /* Header */

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

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

  762. 

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

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

  765. 

  766.     /* Background */

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

  768.     {

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

  770. 

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

  772.         {

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

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

  775.                                 _cucul_attr_to_rgb12bg(*lineattr++),

  776.                                 x * 6, y * 10);

  777.         }

  778.     }

  779. 

  780.     /* Text */

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

  782.     {

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

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

  785. 

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

  787.         {

  788.             uint32_t ch = *linechar++;

  789. 

  790.             if(ch == ' ' || ch == CUCUL_MAGIC_FULLWIDTH)

  791.             {

  792.                 lineattr++;

  793.                 continue;

  794.             }

  795. 

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

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

  798.                                 _cucul_attr_to_rgb12fg(*lineattr++),

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

  800. 

  801.             if(ch < 0x00000020)

  802.                 *cur++ = '?';

  803.             else if(ch > 0x0000007f)

  804.                 cur += cucul_utf32_to_utf8(cur, ch);

  805.             else switch((uint8_t)ch)

  806.             {

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

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

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

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

  811.             }

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

  813.         }

  814.     }

  815. 

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

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

  818. 

  819.     /* Crop to really used size */

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

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

  822. 

  823.     return data;

  824. }

  825. 

  826. /* Export a TGA image */

  827. static void *export_tga(cucul_canvas_t *cv, unsigned long int *bytes)

  828. {

  829.     char const * const *fontlist;

  830.     char *data, *cur;

  831.     cucul_font_t *f;

  832.     unsigned int i, w, h;

  833. 

  834.     fontlist = cucul_get_font_list();

  835.     if(!fontlist[0])

  836.     {

  837. #if defined(HAVE_ERRNO_H)

  838.         errno = EINVAL;

  839. #endif

  840.         return NULL;

  841.     }

  842. 

  843.     f = cucul_load_font(fontlist[0], 0);

  844. 

  845.     w = cucul_get_canvas_width(cv) * cucul_get_font_width(f);

  846.     h = cucul_get_canvas_height(cv) * cucul_get_font_height(f);

  847. 

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

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

  850. 

  851.     /* ID Length */

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

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

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

  855.     /* Image Type: uncompressed truecolor */

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

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

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

  859. 

  860.     /* Image Specification */

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

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

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

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

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

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

  867. 

  868.     /* Image ID: no ID */

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

  870. 

  871.     /* Image Data */

  872.     cucul_render_canvas(cv, f, cur, w, h, 4 * w);

  873. 

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

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

  876.     {

  877.         char w;

  878.         w = cur[i]; cur[i] = cur[i + 3]; cur[i + 3] = w;

  879.         w = cur[i + 1]; cur[i + 1] = cur[i + 2]; cur[i + 2] = w;

  880.     }

  881. 

  882.     cucul_free_font(f);

  883. 

  884.     return data;

  885. }