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/*
* Font lookup and rendering functions
*
* Copyright (C) 2019 Patrick McDermott
*
* This file is part of fbcon2png.
*
* fbcon2png 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.
*
* fbcon2png is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with fbcon2png. If not, see <http://www.gnu.org/licenses/>.
*/
#include "font.h"
#include <string.h>
#include <png.h>
#include <linux/font.h>
#define FONT_H(f) ((size_t) (f)->desc.height)
#define FONT_W(f) ((size_t) (f)->desc.width)
#define CHAR_PIXEL(f, c, x, y) (((((c) * FONT_H(f)) + (y)) * FONT_W(f)) + (x))
struct font {
const struct font_desc desc;
};
static const struct font_desc *fonts[] = {
&font_mplus_1mn_medium_10x14,
&font_mplus_1mn_regular_12x17,
&font_mplus_1mn_regular_14x19,
&font_mplus_1mn_regular_16x22,
};
struct font *
font_find(const char *name)
{
size_t i;
if (!name) {
return (struct font *) fonts[0];
}
for (i = 0; i < *(&fonts + 1) - fonts; ++i) {
if (strcmp(fonts[i]->name, name) == 0) {
return (struct font *) fonts[i];
}
}
return (struct font *) fonts[0];
}
int
font_get_width(struct font *font)
{
return font->desc.width;
}
int
font_get_height(struct font *font)
{
return font->desc.height;
}
void
font_render(struct font *font, png_const_colorp fg, png_const_colorp bg,
char ch, png_bytepp rows, int row, int col)
{
size_t y;
size_t r;
size_t x;
size_t c;
for (y = 0, r = row * FONT_H(font); y < FONT_H(font); ++y, ++r) {
for (x = 0, c = col * FONT_W(font); x < FONT_W(font); ++x, ++c){
if (CHAR_PIXEL(font, ch, x, y)) {
*(&rows[r][c] + 0) = fg->red;
*(&rows[r][c] + 1) = fg->green;
*(&rows[r][c] + 2) = fg->blue;
} else {
*(&rows[r][c] + 0) = bg->red;
*(&rows[r][c] + 1) = bg->green;
*(&rows[r][c] + 2) = bg->blue;
}
}
}
}
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