158 lines
3.6 KiB
C++
158 lines
3.6 KiB
C++
/**
|
|
* DGen's font renderer.
|
|
*/
|
|
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include "font.h" /* The interface functions */
|
|
|
|
#ifndef FONT_VISIBLE
|
|
#define FONT_VISIBLE 24
|
|
#endif
|
|
|
|
extern const short *dgen_font_8x13[0x80];
|
|
extern const short *dgen_font_16x26[0x80];
|
|
extern const short *dgen_font_7x5[0x80];
|
|
|
|
const struct dgen_font dgen_font[] = {
|
|
{ 16, 26, &dgen_font_16x26 },
|
|
{ 8, 13, &dgen_font_8x13 },
|
|
{ 7, 5, &dgen_font_7x5 },
|
|
{ 0, 0, NULL }
|
|
};
|
|
|
|
const struct dgen_font *font_select(unsigned int max_width,
|
|
unsigned int max_height,
|
|
enum font_type type)
|
|
{
|
|
const struct dgen_font *font = dgen_font;
|
|
|
|
assert(type <= FONT_TYPE_AUTO);
|
|
if (type != FONT_TYPE_AUTO) {
|
|
// Make sure we're able to display at least one character.
|
|
font = &font[type];
|
|
if ((max_width < font->w) || (max_height < font->h))
|
|
return NULL;
|
|
return font;
|
|
}
|
|
// Chose a font able to display at least FONT_VISIBLE characters.
|
|
while ((font->data != NULL) &&
|
|
((font->h > max_height) ||
|
|
((max_width / font->w) < FONT_VISIBLE))) {
|
|
++font;
|
|
continue;
|
|
}
|
|
if (font->data == NULL)
|
|
return NULL;
|
|
return font;
|
|
}
|
|
|
|
static void font_mark(uint8_t *buf,
|
|
unsigned int max_width, unsigned int max_height,
|
|
unsigned int bytes_per_pixel, unsigned int pitch,
|
|
unsigned int mark_x,
|
|
unsigned int font_w, unsigned int font_h)
|
|
{
|
|
unsigned int y;
|
|
|
|
if (((mark_x + font_w) > max_width) || (max_height < font_h))
|
|
return;
|
|
buf += (mark_x * bytes_per_pixel);
|
|
for (y = 0; (y != font_h); ++y) {
|
|
unsigned int x;
|
|
unsigned int len = (bytes_per_pixel * font_w);
|
|
|
|
for (x = 0; (x < len); ++x)
|
|
buf[x] ^= 0xff;
|
|
buf += pitch;
|
|
}
|
|
}
|
|
|
|
size_t font_text_width(const char *msg, size_t len,
|
|
unsigned int max_width, unsigned int max_height,
|
|
enum font_type type)
|
|
{
|
|
const struct dgen_font *font =
|
|
font_select(max_width, max_height, type);
|
|
size_t width = 0;
|
|
|
|
if (font == NULL)
|
|
return 0;
|
|
while ((*msg != '\0') && (len)) {
|
|
width += font->w;
|
|
++msg;
|
|
--len;
|
|
}
|
|
return width;
|
|
}
|
|
|
|
size_t font_text_max_len(unsigned int max_width, unsigned int max_height,
|
|
enum font_type type)
|
|
{
|
|
const struct dgen_font *font =
|
|
font_select(max_width, max_height, type);
|
|
|
|
if (font == NULL)
|
|
return ~(size_t)0;
|
|
return (max_width / font->w);
|
|
}
|
|
|
|
size_t font_text(uint8_t *buf,
|
|
unsigned int max_width, unsigned int max_height,
|
|
unsigned int bytes_per_pixel, unsigned int pitch,
|
|
const char *msg, size_t len, unsigned int mark,
|
|
enum font_type type)
|
|
{
|
|
const struct dgen_font *font;
|
|
uint8_t *p_max;
|
|
size_t r;
|
|
unsigned int x;
|
|
|
|
if (len == 0)
|
|
return 0;
|
|
if ((font = font_select(max_width, max_height, type)) == NULL) {
|
|
printf("info: %.*s\n", (unsigned int)len, msg);
|
|
if (mark <= len) {
|
|
printf(" ");
|
|
for (x = 0; (x != mark); ++x)
|
|
putchar(' ');
|
|
puts("^");
|
|
}
|
|
return len;
|
|
}
|
|
p_max = (buf + (pitch * max_height));
|
|
for (x = 0, r = 0;
|
|
((msg[r] != '\0') && (r != len) && ((x + font->w) <= max_width));
|
|
++r, x += font->w) {
|
|
const short *glyph = (*font->data)[(msg[r] & 0x7f)];
|
|
uint8_t *p = (buf + (x * bytes_per_pixel));
|
|
unsigned int n = 0;
|
|
short g;
|
|
|
|
if (glyph == NULL)
|
|
continue;
|
|
while ((g = *glyph) != -1) {
|
|
unsigned int i;
|
|
|
|
p += (((n += g) / font->w) * pitch);
|
|
n %= font->w;
|
|
for (i = 0; (i < bytes_per_pixel); ++i) {
|
|
uint8_t *tmp = &p[((n * bytes_per_pixel) + i)];
|
|
|
|
if (tmp < p_max)
|
|
*tmp = 0xff;
|
|
}
|
|
++glyph;
|
|
}
|
|
if (r == mark)
|
|
font_mark(buf, max_width, max_height, bytes_per_pixel,
|
|
pitch, x, font->w, font->h);
|
|
}
|
|
if (r == mark)
|
|
font_mark(buf, max_width, max_height, bytes_per_pixel, pitch,
|
|
x, font->w, font->h);
|
|
return r;
|
|
}
|