libcaca/cucul/export_svg.c

/*
 *  libcucul      Unicode canvas library
 *  Copyright (c) 2002-2006 Sam Hocevar <sam@zoy.org>
 *                All Rights Reserved
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the Do What The Fuck You Want To
 *  Public License, Version 2, as published by Sam Hocevar. See
 *  http://sam.zoy.org/wtfpl/COPYING for more details.
 */

/** \file export.c
 *  \version \$Id: export_irc.c 384 2006-03-13 18:07:35Z sam $
 *  \author Sam Hocevar <sam@zoy.org>
 *  \author Jean-Yves Lamoureux <jylam@lnxscene.org>
 *  \brief Export function
 *
 *  This file contains export functions for SVG (Scalable Vector Graphics files
 */

#include "config.h"

#if !defined(__KERNEL__)
#   include <stdlib.h>
#   include <stdio.h>
#   include <string.h>
#endif

#include "cucul.h"
#include "cucul_internals.h"

static char const *svg_header =
    "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
    "<svg width=\"%d\" height=\"%d\" viewBox=\"0 0 %d %d\""
    " xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" "
    "xml:space=\"preserve\" version=\"1.1\"  baseProfile=\"full\">\n"
    " <defs>\n"
    "  <style type=\"text/css\">\n"
    "    <![CDATA[\n";


/** \brief Generate SVG representation of current image.
 *
 *  This function generates and returns a SVG representation of
 *  the current image.
 */
void _cucul_get_svg(cucul_t *qq, struct cucul_buffer *ex)
{
    char *cur;
    int x, y;


    static int const palette[] =
    {
        0x000000, 0x000088, 0x008800, 0x008888,
        0x880000, 0x880088, 0x888800, 0x888888,
        0x444444, 0x4444ff, 0x44ff44, 0x44ffff,
        0xff4444, 0xff44ff, 0xffff44, 0xffffff,
    };

    /* 200 is arbitrary but should be ok */
    ex->size = strlen(svg_header) + (qq->width * qq->height * 200);
    ex->buffer = malloc(ex->size);

    cur = ex->buffer;

    /* Header */
    cur += sprintf(cur, svg_header, qq->width*6, qq->height*10, qq->width*6, qq->height*10);

    /* Precalc of colors in CSS style  */
    for(x = 0; x < 0x100; x++)
    {
        cur += sprintf(cur, ".b%02x {fill:#%06X}\n",
                       x,
		       palette[x >> 4 ]);

       cur += sprintf(cur, ".f%02x {fill:#%06X}\n",
                       x,
		       palette[x & 0xf ]);
    }

    cur += sprintf(cur, "]]>\n");
    cur += sprintf(cur, "</style>\n");
    cur += sprintf(cur, "</defs>\n");
    cur += sprintf(cur, "<g id=\"mainlayer\" font-size=\"12\">\n");


    /* Background */
    for(y=0; y<(int)(qq->height);y++) {
	uint8_t *lineattr = qq->attr + y * qq->width;
        for(x = 0; x < (int)qq->width; x++) {
	    cur += sprintf(cur, "<rect class=\"b%02x\" x=\"%d\" y=\"%d\" width=\"6\" height=\"10\"/>\n",
			   lineattr[x],
			   x*6,
			   y*10);
	}
    }

    /* Text */
    for(y=0; y<(int)(qq->height);y++) {
	uint8_t *lineattr = qq->attr + y * qq->width;
	uint32_t *linechar = qq->chars + y * qq->width;
        for(x = 0; x < (int)qq->width; x++) {
	    cur += sprintf(cur, "<text  class=\"f%02x\" x=\"%d\" y=\"%d\">%c</text>\n",
			   lineattr[x],
			   x*6,
			   (y*10)+10,
			   linechar[x]);
  	}
    }


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

    /* Crop to really used size */
    ex->size = strlen(ex->buffer) + 1;
    ex->buffer = realloc(ex->buffer, ex->size);
}