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/*
* libcaca Colour ASCII-Art library
* Copyright (c) 2002-2012 Sam Hocevar <sam@hocevar.net>
* All Rights Reserved
*
* This library is free software. It comes without any warranty, to
* the extent permitted by applicable law. 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://www.wtfpl.net/ for more details.
*/
/*
* This file contains box drawing functions, both filled and outline.
*/
#include "config.h"
#if !defined(__KERNEL__)
# include <stdlib.h>
#endif
#include "caca.h"
#include "caca_internals.h"
static int draw_box(caca_canvas_t *cv, int x, int y, int w, int h,
uint32_t const *chars);
/** \brief Draw a box on the canvas using the given character.
*
* This function never fails.
*
* \param cv The handle to the libcaca canvas.
* \param x X coordinate of the upper-left corner of the box.
* \param y Y coordinate of the upper-left corner of the box.
* \param w Width of the box.
* \param h Height of the box.
* \param ch UTF-32 character to be used to draw the box.
* \return This function always returns 0.
*/
int caca_draw_box(caca_canvas_t *cv, int x, int y, int w, int h, uint32_t ch)
{
int x2 = x + w - 1;
int y2 = y + h - 1;
caca_draw_line(cv, x, y, x, y2, ch);
caca_draw_line(cv, x, y2, x2, y2, ch);
caca_draw_line(cv, x2, y2, x2, y, ch);
caca_draw_line(cv, x2, y, x, y, ch);
return 0;
}
/** \brief Draw a thin box on the canvas.
*
* This function never fails.
*
* \param cv The handle to the libcaca canvas.
* \param x X coordinate of the upper-left corner of the box.
* \param y Y coordinate of the upper-left corner of the box.
* \param w Width of the box.
* \param h Height of the box.
* \return This function always returns 0.
*/
int caca_draw_thin_box(caca_canvas_t *cv, int x, int y, int w, int h)
{
static uint32_t const ascii_chars[] =
{
'-', '|', ',', '`', '.', '\''
};
return draw_box(cv, x, y, w, h, ascii_chars);
}
/** \brief Draw a box on the canvas using CP437 characters.
*
* This function never fails.
*
* \param cv The handle to the libcaca canvas.
* \param x X coordinate of the upper-left corner of the box.
* \param y Y coordinate of the upper-left corner of the box.
* \param w Width of the box.
* \param h Height of the box.
* \return This function always returns 0.
*/
int caca_draw_cp437_box(caca_canvas_t *cv, int x, int y, int w, int h)
{
static uint32_t const cp437_chars[] =
{
/* ─ │ ┌ └ ┐ ┘ */
0x2500, 0x2502, 0x250c, 0x2514, 0x2510, 0x2518
};
return draw_box(cv, x, y, w, h, cp437_chars);
}
/** \brief Fill a box on the canvas using the given character.
*
* This function never fails.
*
* \param cv The handle to the libcaca canvas.
* \param x X coordinate of the upper-left corner of the box.
* \param y Y coordinate of the upper-left corner of the box.
* \param w Width of the box.
* \param h Height of the box.
* \param ch UTF-32 character to be used to draw the box.
* \return This function always returns 0.
*/
int caca_fill_box(caca_canvas_t *cv, int x, int y, int w, int h,
uint32_t ch)
{
int i, j, xmax, ymax;
int x2 = x + w - 1;
int y2 = y + h - 1;
if(x > x2)
{
int tmp = x;
x = x2; x2 = tmp;
}
if(y > y2)
{
int tmp = y;
y = y2; y2 = tmp;
}
xmax = cv->width - 1;
ymax = cv->height - 1;
if(x2 < 0 || y2 < 0 || x > xmax || y > ymax)
return 0;
if(x < 0) x = 0;
if(y < 0) y = 0;
if(x2 > xmax) x2 = xmax;
if(y2 > ymax) y2 = ymax;
#if 0
/* FIXME: this fails with fullwidth character blits. Also, the dirty
* rectangle handling may miss fullwidth cells. */
/* Optimise dirty rectangle handling, part 1 */
cv->dirty_disabled++;
#endif
for(j = y; j <= y2; j++)
for(i = x; i <= x2; i++)
caca_put_char(cv, i, j, ch);
#if 0
/* Optimise dirty rectangle handling, part 2 */
cv->dirty_disabled--;
if(!cv->dirty_disabled)
caca_add_dirty_rect(cv, x, y, x2 - x + 1, y2 - y + 1);
#endif
return 0;
}
/*
* XXX: The following functions are local.
*/
static int draw_box(caca_canvas_t *cv, int x, int y, int w, int h,
uint32_t const *chars)
{
int i, j, xmax, ymax;
int x2 = x + w - 1;
int y2 = y + h - 1;
if(x > x2)
{
int tmp = x;
x = x2; x2 = tmp;
}
if(y > y2)
{
int tmp = y;
y = y2; y2 = tmp;
}
xmax = cv->width - 1;
ymax = cv->height - 1;
if(x2 < 0 || y2 < 0 || x > xmax || y > ymax)
return 0;
/* Draw edges */
if(y >= 0)
for(i = x < 0 ? 1 : x + 1; i < x2 && i < xmax; i++)
caca_put_char(cv, i, y, chars[0]);
if(y2 <= ymax)
for(i = x < 0 ? 1 : x + 1; i < x2 && i < xmax; i++)
caca_put_char(cv, i, y2, chars[0]);
if(x >= 0)
for(j = y < 0 ? 1 : y + 1; j < y2 && j < ymax; j++)
caca_put_char(cv, x, j, chars[1]);
if(x2 <= xmax)
for(j = y < 0 ? 1 : y + 1; j < y2 && j < ymax; j++)
caca_put_char(cv, x2, j, chars[1]);
/* Draw corners */
caca_put_char(cv, x, y, chars[2]);
caca_put_char(cv, x, y2, chars[3]);
caca_put_char(cv, x2, y, chars[4]);
caca_put_char(cv, x2, y2, chars[5]);
return 0;
}
/*
* XXX: The following functions are aliases.
*/
int cucul_draw_box(cucul_canvas_t *, int, int, int, int, uint32_t)
CACA_ALIAS(caca_draw_box);
int cucul_draw_thin_box(cucul_canvas_t *, int, int, int, int)
CACA_ALIAS(caca_draw_thin_box);
int cucul_draw_cp437_box(cucul_canvas_t *, int, int, int, int)
CACA_ALIAS(caca_draw_cp437_box);
int cucul_fill_box(cucul_canvas_t *, int, int, int, int, uint32_t)
CACA_ALIAS(caca_fill_box);
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