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#include <assert.h>
#include <stdarg.h>
#include <stdlib.h>
#include "til_fb.h"
#include "ascii/ascii.h"
#include "txt.h"
struct txt_t {
int len, width, height;
char str[];
};
/* compute the rectangle dimensions of the string in rendered pixels */
static void measure_str(const char *str, int *res_width, int *res_height)
{
int rows = 1, cols = 0, col = 0;
char c;
assert(str);
assert(res_width);
assert(res_height);
while ((c = *str)) {
switch (c) {
case ' '...'~':
col++;
break;
case '\n':
if (col > cols)
cols = col;
col = 0;
rows++;
break;
default:
break;
}
str++;
}
*res_height = 1 + rows * (ASCII_HEIGHT + 1);
*res_width = 1 + cols * (ASCII_WIDTH + 1);
}
txt_t * txt_new(const char *str)
{
txt_t *txt;
int len;
assert(str);
len = strlen(str);
txt = calloc(1, sizeof(txt_t) + len + 1);
if (!txt)
return NULL;
txt->len = len;
memcpy(txt->str, str, len);
measure_str(txt->str, &txt->width, &txt->height);
return txt;
}
txt_t * txt_newf(const char *fmt, ...)
{
char buf[1024] = {}; /* XXX: it's not expected there will be long strings */
va_list ap;
assert(fmt);
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
va_end(ap);
return txt_new(buf);
}
txt_t * txt_free(txt_t *txt)
{
free(txt);
return NULL;
}
/* Adjusts x and y according to alignment, width, and height. Returning the adjusted x and y
* in res_x, res_y.
*
* res_x,res_y will be the coordinate of the upper left corner of the rect
* described by width,height when aligned relative to x,y according to the
* specified alignment.
*
* e.g. if an alignment of TXT_HALIGN_LEFT,TXT_VALIGN_TOP is supplied, x,y is returned verbatim
* in res_x,res_y.
* an alignment of TXT_HALIGN_CENTER,TXT_VALIGN_CENTER returns x-width/2 and y-width/2.
*/
static void justify(txt_align_t alignment, int x, int y, unsigned width, unsigned height, int *res_x, int *res_y)
{
assert(res_x);
assert(res_y);
switch (alignment.horiz) {
case TXT_HALIGN_CENTER:
x -= width >> 1;
break;
case TXT_HALIGN_LEFT:
break;
case TXT_HALIGN_RIGHT:
x -= width;
break;
default:
assert(0);
}
switch (alignment.vert) {
case TXT_VALIGN_CENTER:
y -= height >> 1;
break;
case TXT_VALIGN_TOP:
break;
case TXT_VALIGN_BOTTOM:
y -= height;
break;
default:
assert(0);
}
*res_x = x;
*res_y = y;
}
static int overlaps(int x1, int y1, unsigned w1, unsigned h1, int x2, int y2, unsigned w2, unsigned h2)
{
/* TODO */
return 1;
}
static inline void draw_char(til_fb_fragment_t *fragment, uint32_t color, int x, int y, char c)
{
/* TODO: this could be optimized to skip characters with no overlap */
for (int i = 0; i < ASCII_HEIGHT; i++) {
for (int j = 0; j < ASCII_WIDTH; j++) {
if (ascii_chars[c][i * ASCII_WIDTH + j])
til_fb_fragment_put_pixel_checked(fragment, 0, x + j, y + i, color);
}
}
}
void txt_render_fragment(txt_t *txt, til_fb_fragment_t *fragment, uint32_t color, int x, int y, txt_align_t alignment)
{
int jx, jy, col, row;
char c, *str;
assert(txt);
assert(fragment);
justify(alignment, x, y, txt->width, txt->height, &jx, &jy);
if (!overlaps(jx, jy, txt->width, txt->height,
fragment->x, fragment->y,
fragment->width, fragment->height))
return;
for (col = 0, row = 0, str = txt->str; *str; str++) {
switch (*str) {
case ' '...'~':
draw_char(fragment, color, jx + 1 + col * (ASCII_WIDTH + 1), jy + 1 + row * (ASCII_HEIGHT + 1), *str);
col++;
break;
case '\n':
col = 0;
row++;
break;
default:
break;
}
}
}
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