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tools/libtxt/edit.c: forgot to commit in 67a3ecc798

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This commit is contained in:
Werner Almesberger 2012-06-30 11:44:09 -03:00
parent 3ef4fb3ca2
commit e2eced62a2
1 changed files with 96 additions and 0 deletions
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tools/libtxt/edit.c Normal file
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/*
* tools/libtxt/edit.c - Editing and rendering
*
* Written 2012 by Werner Almesberger
* Copyright 2012 Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdint.h>
#include <stdlib.h>
#include "libtxt.h"
static int *do_edit(uint8_t *canvas, int width, int height,
const struct edit *e, const char **error)
{
struct image *img;
struct font *font = NULL;
int x = 0, y = 0, max = 0;
int spc = 1;
const char *s;
int xo, yo;
while (e) {
switch (e->type) {
case edit_string:
for (s = e->u.s; *s; s++) {
xo = draw_char(canvas, width, height,
font, *s, x, y);
yo = char_height(font, *s);
if (yo > max)
max = yo;
x += xo+spc;
}
break;
case edit_font:
free_font(font);
img = load_image(e->u.s, error);
if (!img)
return 0;
font = make_font(img, error);
if (!font)
goto fail;
break;
case edit_spc:
spc = e->u.n;
break;
case edit_xoff:
x += e->u.n;
break;
case edit_xpos:
x = e->u.n;
break;
case edit_yoff:
y += e->u.n;
break;
case edit_ypos:
y = e->u.n;
break;
case edit_nl:
x = 0;
y += max+1;
max = 0;
break;
default:
abort();
}
e = e->next;
}
fail:
free_image(img);
free_font(font);
return 0;
}
void *apply_edits(int width, int height, const struct edit *e,
const char **error)
{
uint8_t *canvas;
canvas = calloc(1, (width*height+7) >> 3);
if (!canvas)
abort();
if (do_edit(canvas, width, height, e, error))
return canvas;
free(canvas);
return NULL;
}