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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 <assert.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <png.h>
#include <linux/font.h>
#include "image.h"
#define BIT_TO_BYTE(i) ((i) / CHAR_BIT)
#define BITS_TO_BYTES(i) BIT_TO_BYTE((i) + CHAR_BIT - 1)
#define BIT_BYTE_SHIFT(i) (CHAR_BIT - 1 - ((i) % CHAR_BIT))
#define FONT_H(f) ((size_t) (f)->desc.height)
#define FONT_W(f) ((size_t) (f)->desc.width)
#define FONT_W_BYTES(f) BITS_TO_BYTES(FONT_W(f))
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,
};
void
font_list(FILE *stream)
{
size_t i;
assert(stream);
for (i = 0; i < *(&fonts + 1) - fonts; ++i) {
fprintf(stream, "%s\n", fonts[i]->name);
}
}
struct font *
font_default(void)
{
struct font *font;
int pref;
size_t i;
font = NULL;
pref = -10000;
for (i = 0; i < *(&fonts + 1) - fonts; ++i) {
if (fonts[i]->pref > pref) {
font = (struct font *) fonts[i];
pref = fonts[i]->pref;
}
}
return font;
}
struct font *
font_find(const char *name)
{
size_t i;
assert(name);
if (!name) {
return NULL;
}
for (i = 0; i < *(&fonts + 1) - fonts; ++i) {
if (strcmp(fonts[i]->name, name) == 0) {
return (struct font *) fonts[i];
}
}
return NULL;
}
int
font_get_width(const struct font *font)
{
assert(font);
return font->desc.width;
}
int
font_get_height(const struct font *font)
{
assert(font);
return font->desc.height;
}
void
font_render(const struct font *font, png_const_colorp fg, png_const_colorp bg,
unsigned char ch, png_bytepp rows, int row, int col)
{
size_t y;
size_t r;
size_t x;
size_t c;
size_t byte;
unsigned char font_ch;
assert(font);
assert(fg);
assert(bg);
assert(rows && *rows);
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){
byte = ((ch * FONT_H(font)) + y) * FONT_W_BYTES(font) +
BIT_TO_BYTE(x);
font_ch = font->desc.data[byte];
if ((font_ch >> (BIT_BYTE_SHIFT(x))) & 0x01) {
rows[r][c * IMAGE_PIXEL_SIZE + 0] = fg->red;
rows[r][c * IMAGE_PIXEL_SIZE + 1] = fg->green;
rows[r][c * IMAGE_PIXEL_SIZE + 2] = fg->blue;
} else {
rows[r][c * IMAGE_PIXEL_SIZE + 0] = bg->red;
rows[r][c * IMAGE_PIXEL_SIZE + 1] = bg->green;
rows[r][c * IMAGE_PIXEL_SIZE + 2] = bg->blue;
}
}
}
}
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