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|
/* SPDX-License-Identifier: MIT */
/*
* konfont.h
*
* Copyright (c) 2026 KonAki
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef KONFONT_H
#define KONFONT_H
#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdlib.h>
#include "konsofren.h"
#define KON_FONT_FIRST_CHAR 32
#define KON_FONT_NUM_CHARS 95
typedef struct kon_font kon_font_t;
/*** font declarations ***/
kon_font_t *kon_loadFont(const uint8_t *ttf_data, size_t size, float pixelHeight);
/* a small built in 8x13 bitmap font, needs no files. scale 1 is 13 pixels high, 2 is 26 and so on.
monospace, ascii only, the baseline is 10 rows below the top. kon_fontGetAtlas gives NULL for it */
kon_font_t *kon_loadBuiltinFont(int scale);
void kon_freeFont(kon_font_t *font);
kon_image *kon_fontGetAtlas(kon_font_t *font);
/* the ttf data has to stay alive for as long as the font, resizing bakes from it again */
float kon_fontPixelHeight(const kon_font_t *font);
int kon_fontResize(kon_font_t *font, float pixelHeight);
/*** text draw declarations ***/
/* x, y is the left end of the baseline. color is 0xAARRGGBB, the alpha fades the text. ascii only for now, anything else is skipped */
void kon_drawText(kon_framebuffer_t *fb, kon_font_t *font, int x, int y, const char *text, uint32_t color);
void kon_measureText(kon_font_t *font, const char *text, int *outWidth, int *outHeight);
/*** implementatoin ***/
#ifdef KONFONT_IMPLEMENTATION
#include "stb_truetype.h"
struct kon_font {
int builtin, scale;
const uint8_t *ttf;
stbtt_bakedchar chardata[KON_FONT_NUM_CHARS];
uint8_t *atlasPixels;
int atlasSize;
float pixelHeight;
};
/*** built in font ***/
/* 8x13 glyphs for ascii 32 to 126, one byte per row, leftmost pixel is the top bit. public domain misc-fixed derived font */
static const unsigned char kon_builtinGlyphs_[KON_FONT_NUM_CHARS][13] = {
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* */
{ 0x00, 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x10, 0x00, 0x00 }, /* ! */
{ 0x00, 0x00, 0x24, 0x24, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* " */
{ 0x00, 0x00, 0x00, 0x24, 0x24, 0x7E, 0x24, 0x7E, 0x24, 0x24, 0x00, 0x00, 0x00 }, /* # */
{ 0x00, 0x00, 0x10, 0x3C, 0x50, 0x50, 0x38, 0x14, 0x14, 0x78, 0x10, 0x00, 0x00 }, /* $ */
{ 0x00, 0x00, 0x22, 0x52, 0x24, 0x08, 0x08, 0x10, 0x24, 0x2A, 0x44, 0x00, 0x00 }, /* % */
{ 0x00, 0x00, 0x00, 0x00, 0x30, 0x48, 0x48, 0x30, 0x4A, 0x44, 0x3A, 0x00, 0x00 }, /* & */
{ 0x00, 0x00, 0x10, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* ' */
{ 0x00, 0x00, 0x04, 0x08, 0x08, 0x10, 0x10, 0x10, 0x08, 0x08, 0x04, 0x00, 0x00 }, /* ( */
{ 0x00, 0x00, 0x20, 0x10, 0x10, 0x08, 0x08, 0x08, 0x10, 0x10, 0x20, 0x00, 0x00 }, /* ) */
{ 0x00, 0x00, 0x00, 0x00, 0x24, 0x18, 0x7E, 0x18, 0x24, 0x00, 0x00, 0x00, 0x00 }, /* ch42 */
{ 0x00, 0x00, 0x00, 0x00, 0x10, 0x10, 0x7C, 0x10, 0x10, 0x00, 0x00, 0x00, 0x00 }, /* + */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x38, 0x30, 0x40, 0x00 }, /* , */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* - */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x10, 0x00 }, /* . */
{ 0x00, 0x00, 0x02, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x80, 0x00, 0x00 }, /* ch47 */
{ 0x00, 0x00, 0x18, 0x24, 0x42, 0x42, 0x42, 0x42, 0x42, 0x24, 0x18, 0x00, 0x00 }, /* 0 */
{ 0x00, 0x00, 0x10, 0x30, 0x50, 0x10, 0x10, 0x10, 0x10, 0x10, 0x7C, 0x00, 0x00 }, /* 1 */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x02, 0x04, 0x18, 0x20, 0x40, 0x7E, 0x00, 0x00 }, /* 2 */
{ 0x00, 0x00, 0x7E, 0x02, 0x04, 0x08, 0x1C, 0x02, 0x02, 0x42, 0x3C, 0x00, 0x00 }, /* 3 */
{ 0x00, 0x00, 0x04, 0x0C, 0x14, 0x24, 0x44, 0x44, 0x7E, 0x04, 0x04, 0x00, 0x00 }, /* 4 */
{ 0x00, 0x00, 0x7E, 0x40, 0x40, 0x5C, 0x62, 0x02, 0x02, 0x42, 0x3C, 0x00, 0x00 }, /* 5 */
{ 0x00, 0x00, 0x1C, 0x20, 0x40, 0x40, 0x5C, 0x62, 0x42, 0x42, 0x3C, 0x00, 0x00 }, /* 6 */
{ 0x00, 0x00, 0x7E, 0x02, 0x04, 0x08, 0x08, 0x10, 0x10, 0x20, 0x20, 0x00, 0x00 }, /* 7 */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x42, 0x3C, 0x42, 0x42, 0x42, 0x3C, 0x00, 0x00 }, /* 8 */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x46, 0x3A, 0x02, 0x02, 0x04, 0x38, 0x00, 0x00 }, /* 9 */
{ 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x10, 0x00, 0x00, 0x10, 0x38, 0x10, 0x00 }, /* : */
{ 0x00, 0x00, 0x00, 0x00, 0x10, 0x38, 0x10, 0x00, 0x00, 0x38, 0x30, 0x40, 0x00 }, /* ; */
{ 0x00, 0x00, 0x02, 0x04, 0x08, 0x10, 0x20, 0x10, 0x08, 0x04, 0x02, 0x00, 0x00 }, /* < */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x7E, 0x00, 0x00, 0x00, 0x00 }, /* = */
{ 0x00, 0x00, 0x40, 0x20, 0x10, 0x08, 0x04, 0x08, 0x10, 0x20, 0x40, 0x00, 0x00 }, /* > */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x02, 0x04, 0x08, 0x08, 0x00, 0x08, 0x00, 0x00 }, /* ? */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x4E, 0x52, 0x56, 0x4A, 0x40, 0x3C, 0x00, 0x00 }, /* @ */
{ 0x00, 0x00, 0x18, 0x24, 0x42, 0x42, 0x42, 0x7E, 0x42, 0x42, 0x42, 0x00, 0x00 }, /* A */
{ 0x00, 0x00, 0x78, 0x44, 0x42, 0x44, 0x78, 0x44, 0x42, 0x44, 0x78, 0x00, 0x00 }, /* B */
{ 0x00, 0x00, 0x3C, 0x42, 0x40, 0x40, 0x40, 0x40, 0x40, 0x42, 0x3C, 0x00, 0x00 }, /* C */
{ 0x00, 0x00, 0x78, 0x44, 0x42, 0x42, 0x42, 0x42, 0x42, 0x44, 0x78, 0x00, 0x00 }, /* D */
{ 0x00, 0x00, 0x7E, 0x40, 0x40, 0x40, 0x78, 0x40, 0x40, 0x40, 0x7E, 0x00, 0x00 }, /* E */
{ 0x00, 0x00, 0x7E, 0x40, 0x40, 0x40, 0x78, 0x40, 0x40, 0x40, 0x40, 0x00, 0x00 }, /* F */
{ 0x00, 0x00, 0x3C, 0x42, 0x40, 0x40, 0x40, 0x4E, 0x42, 0x46, 0x3A, 0x00, 0x00 }, /* G */
{ 0x00, 0x00, 0x42, 0x42, 0x42, 0x42, 0x7E, 0x42, 0x42, 0x42, 0x42, 0x00, 0x00 }, /* H */
{ 0x00, 0x00, 0x7C, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x7C, 0x00, 0x00 }, /* I */
{ 0x00, 0x00, 0x1F, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x44, 0x38, 0x00, 0x00 }, /* J */
{ 0x00, 0x00, 0x42, 0x44, 0x48, 0x50, 0x60, 0x50, 0x48, 0x44, 0x42, 0x00, 0x00 }, /* K */
{ 0x00, 0x00, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x7E, 0x00, 0x00 }, /* L */
{ 0x00, 0x00, 0x82, 0x82, 0xC6, 0xAA, 0x92, 0x92, 0x82, 0x82, 0x82, 0x00, 0x00 }, /* M */
{ 0x00, 0x00, 0x42, 0x42, 0x62, 0x52, 0x4A, 0x46, 0x42, 0x42, 0x42, 0x00, 0x00 }, /* N */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3C, 0x00, 0x00 }, /* O */
{ 0x00, 0x00, 0x7C, 0x42, 0x42, 0x42, 0x7C, 0x40, 0x40, 0x40, 0x40, 0x00, 0x00 }, /* P */
{ 0x00, 0x00, 0x3C, 0x42, 0x42, 0x42, 0x42, 0x42, 0x52, 0x4A, 0x3C, 0x02, 0x00 }, /* Q */
{ 0x00, 0x00, 0x7C, 0x42, 0x42, 0x42, 0x7C, 0x50, 0x48, 0x44, 0x42, 0x00, 0x00 }, /* R */
{ 0x00, 0x00, 0x3C, 0x42, 0x40, 0x40, 0x3C, 0x02, 0x02, 0x42, 0x3C, 0x00, 0x00 }, /* S */
{ 0x00, 0x00, 0xFE, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00 }, /* T */
{ 0x00, 0x00, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x3C, 0x00, 0x00 }, /* U */
{ 0x00, 0x00, 0x82, 0x82, 0x44, 0x44, 0x44, 0x28, 0x28, 0x28, 0x10, 0x00, 0x00 }, /* V */
{ 0x00, 0x00, 0x82, 0x82, 0x82, 0x82, 0x92, 0x92, 0x92, 0xAA, 0x44, 0x00, 0x00 }, /* W */
{ 0x00, 0x00, 0x82, 0x82, 0x44, 0x28, 0x10, 0x28, 0x44, 0x82, 0x82, 0x00, 0x00 }, /* X */
{ 0x00, 0x00, 0x82, 0x82, 0x44, 0x28, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00 }, /* Y */
{ 0x00, 0x00, 0x7E, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x40, 0x7E, 0x00, 0x00 }, /* Z */
{ 0x00, 0x00, 0x3C, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x3C, 0x00, 0x00 }, /* [ */
{ 0x00, 0x00, 0x80, 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x02, 0x00, 0x00 }, /* ch92 */
{ 0x00, 0x00, 0x78, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x78, 0x00, 0x00 }, /* ] */
{ 0x00, 0x00, 0x10, 0x28, 0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* ^ */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0x00 }, /* _ */
{ 0x00, 0x10, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* ` */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x02, 0x3E, 0x42, 0x46, 0x3A, 0x00, 0x00 }, /* a */
{ 0x00, 0x00, 0x40, 0x40, 0x40, 0x5C, 0x62, 0x42, 0x42, 0x62, 0x5C, 0x00, 0x00 }, /* b */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x42, 0x40, 0x40, 0x42, 0x3C, 0x00, 0x00 }, /* c */
{ 0x00, 0x00, 0x02, 0x02, 0x02, 0x3A, 0x46, 0x42, 0x42, 0x46, 0x3A, 0x00, 0x00 }, /* d */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x42, 0x7E, 0x40, 0x42, 0x3C, 0x00, 0x00 }, /* e */
{ 0x00, 0x00, 0x1C, 0x22, 0x20, 0x20, 0x7C, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00 }, /* f */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3A, 0x44, 0x44, 0x38, 0x40, 0x3C, 0x42, 0x3C }, /* g */
{ 0x00, 0x00, 0x40, 0x40, 0x40, 0x5C, 0x62, 0x42, 0x42, 0x42, 0x42, 0x00, 0x00 }, /* h */
{ 0x00, 0x00, 0x00, 0x10, 0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x7C, 0x00, 0x00 }, /* i */
{ 0x00, 0x00, 0x00, 0x04, 0x00, 0x0C, 0x04, 0x04, 0x04, 0x04, 0x44, 0x44, 0x38 }, /* j */
{ 0x00, 0x00, 0x40, 0x40, 0x40, 0x44, 0x48, 0x70, 0x48, 0x44, 0x42, 0x00, 0x00 }, /* k */
{ 0x00, 0x00, 0x30, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x7C, 0x00, 0x00 }, /* l */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0xEC, 0x92, 0x92, 0x92, 0x92, 0x82, 0x00, 0x00 }, /* m */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x5C, 0x62, 0x42, 0x42, 0x42, 0x42, 0x00, 0x00 }, /* n */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x42, 0x42, 0x42, 0x42, 0x3C, 0x00, 0x00 }, /* o */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x5C, 0x62, 0x42, 0x62, 0x5C, 0x40, 0x40, 0x40 }, /* p */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3A, 0x46, 0x42, 0x46, 0x3A, 0x02, 0x02, 0x02 }, /* q */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x5C, 0x22, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00 }, /* r */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x3C, 0x42, 0x30, 0x0C, 0x42, 0x3C, 0x00, 0x00 }, /* s */
{ 0x00, 0x00, 0x00, 0x20, 0x20, 0x7C, 0x20, 0x20, 0x20, 0x22, 0x1C, 0x00, 0x00 }, /* t */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x44, 0x44, 0x44, 0x44, 0x3A, 0x00, 0x00 }, /* u */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x44, 0x44, 0x28, 0x28, 0x10, 0x00, 0x00 }, /* v */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x82, 0x82, 0x92, 0x92, 0xAA, 0x44, 0x00, 0x00 }, /* w */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x00, 0x00 }, /* x */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x42, 0x42, 0x42, 0x46, 0x3A, 0x02, 0x42, 0x3C }, /* y */
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x7E, 0x04, 0x08, 0x10, 0x20, 0x7E, 0x00, 0x00 }, /* z */
{ 0x00, 0x00, 0x0E, 0x10, 0x10, 0x08, 0x30, 0x08, 0x10, 0x10, 0x0E, 0x00, 0x00 }, /* { */
{ 0x00, 0x00, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x00, 0x00 }, /* | */
{ 0x00, 0x00, 0x70, 0x08, 0x08, 0x10, 0x0C, 0x10, 0x08, 0x08, 0x70, 0x00, 0x00 }, /* } */
{ 0x00, 0x00, 0x24, 0x54, 0x48, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, /* ~ */
};
#define KON_BUILTIN_WIDTH 8
#define KON_BUILTIN_HEIGHT 13
#define KON_BUILTIN_BASELINE 10
#define KON_BUILTIN_MAX_SCALE 8
static void kon_fontDrawBuiltin_(kon_framebuffer_t *fb, const kon_font_t *font, int x, int y, const char *text, uint32_t color) {
int s = font->scale;
int top = y - KON_BUILTIN_BASELINE * s;
if (color >> 24 == 0) return;
for (const char *p = text; *p; p++) {
unsigned char c = (unsigned char)*p;
if (c < KON_FONT_FIRST_CHAR || c >= KON_FONT_FIRST_CHAR + KON_FONT_NUM_CHARS) continue;
for (int row = 0; row < KON_BUILTIN_HEIGHT; row++) {
unsigned char bits = kon_builtinGlyphs_[c - KON_FONT_FIRST_CHAR][row];
for (int bit = 0; bit < KON_BUILTIN_WIDTH; ) {
if (!(bits & (0x80 >> bit))) {
bit++;
continue;
}
int start = bit;
while (bit < KON_BUILTIN_WIDTH && (bits & (0x80 >> bit))) bit++;
kon_fillRectangle(fb, x + start * s, top + row * s, (bit - start) * s, s, color);
}
}
x += KON_BUILTIN_WIDTH * s;
}
}
kon_font_t *kon_loadBuiltinFont(int scale) {
if (scale < 1 || scale > KON_BUILTIN_MAX_SCALE) return NULL;
kon_font_t *font = calloc(1, sizeof(kon_font_t));
if (!font) return NULL;
font->builtin = 1;
font->scale = scale;
font->pixelHeight = (float)(KON_BUILTIN_HEIGHT * scale);
return font;
}
/*** private helpers ***/
static bool kon_fontBakeAtlas(kon_font_t *font, const uint8_t *ttf_data, float pixelHeight) {
int sizes[] = {256, 512, 1024, 2048};
for (int i = 0; i < 4; i++) {
int atlasSize = sizes[i];
uint8_t *bitmap = malloc((size_t)atlasSize * (size_t)atlasSize);
if (!bitmap) return false;
int result = stbtt_BakeFontBitmap(ttf_data, 0, pixelHeight, bitmap, atlasSize, atlasSize, KON_FONT_FIRST_CHAR, KON_FONT_NUM_CHARS, font->chardata);
if (result > 0) {
font->atlasPixels = bitmap;
font->atlasSize = atlasSize;
return true;
}
free(bitmap);
}
return false;
}
/*** font implementation ***/
kon_font_t *kon_loadFont(const uint8_t *ttf_data, size_t size, float pixelHeight) {
(void)size;
if (!ttf_data || pixelHeight <= 0.0f) return NULL;
kon_font_t *font = calloc(1, sizeof(kon_font_t));
if (!font) return NULL;
font->ttf = ttf_data;
font->atlasPixels = NULL;
font->pixelHeight = pixelHeight;
if (!kon_fontBakeAtlas(font, ttf_data, pixelHeight)) {
free(font);
return NULL;
}
return font;
}
void kon_freeFont(kon_font_t *font) {
if (!font) return;
free(font->atlasPixels);
free(font);
}
float kon_fontPixelHeight(const kon_font_t *font) {
return font ? font->pixelHeight : 0.0f;
}
int kon_fontResize(kon_font_t *font, float pixelHeight) {
kon_font_t next;
if (!font || pixelHeight <= 0.0f) return 0;
if (font->builtin) {
int scale = (int)(pixelHeight / (float)KON_BUILTIN_HEIGHT + 0.5f);
if (scale < 1) scale = 1;
if (scale > KON_BUILTIN_MAX_SCALE) scale = KON_BUILTIN_MAX_SCALE;
font->scale = scale;
font->pixelHeight = (float)(KON_BUILTIN_HEIGHT * scale);
return 1;
}
next = *font;
next.atlasPixels = NULL;
if (!kon_fontBakeAtlas(&next, font->ttf, pixelHeight)) return 0;
free(font->atlasPixels);
next.pixelHeight = pixelHeight;
*font = next;
return 1;
}
kon_image *kon_fontGetAtlas(kon_font_t *font) {
if (!font || font->builtin) return NULL;
int n = font->atlasSize * font->atlasSize;
uint8_t *rgba = malloc((size_t)n * 4);
if (!rgba) return NULL;
for (int i = 0; i < n; i++) {
uint8_t a = font->atlasPixels[i];
rgba[i * 4 + 0] = 255;
rgba[i * 4 + 1] = 255;
rgba[i * 4 + 2] = 255;
rgba[i * 4 + 3] = a;
}
kon_image *img = kon_loadImage(rgba, font->atlasSize, font->atlasSize, konFormatRGBA8);
free(rgba);
return img;
}
/*** text draw implementation ***/
void kon_drawText(kon_framebuffer_t *fb, kon_font_t *font, int x, int y, const char *text, uint32_t color) {
if (!fb || !font || !text) return;
if (font->builtin) {
kon_fontDrawBuiltin_(fb, font, x, y, text, color);
return;
}
uint32_t baseColor = color & 0x00FFFFFF;
uint32_t colorAlpha = color >> 24;
if (colorAlpha == 0) return;
float cursorX = (float)x;
float cursorY = (float)y;
for (const char *p = text; *p; p++) {
unsigned char c = (unsigned char)*p;
if (c < KON_FONT_FIRST_CHAR || c >= KON_FONT_FIRST_CHAR + KON_FONT_NUM_CHARS) continue;
stbtt_aligned_quad q;
stbtt_GetBakedQuad(font->chardata, font->atlasSize, font->atlasSize, c - KON_FONT_FIRST_CHAR, &cursorX, &cursorY, &q, 0);
int src_x0 = (int)(q.s0 * font->atlasSize);
int src_y0 = (int)(q.t0 * font->atlasSize);
int glyphW = (int)(q.x1 - q.x0);
int glyphH = (int)(q.y1 - q.y0);
int dstX = (int)q.x0;
int dstY = (int)q.y0;
int gx0 = 0, gy0 = 0;
if (dstX < 0) gx0 = -dstX;
if (dstY < 0) gy0 = -dstY;
int gx1 = glyphW, gy1 = glyphH;
if (dstX + gx1 > fb->width) gx1 = fb->width - dstX;
if (dstY + gy1 > fb->height) gy1 = fb->height - dstY;
for (int gy = gy0; gy < gy1; gy++) {
const uint8_t *in = font->atlasPixels + (size_t)(src_y0 + gy) * font->atlasSize + src_x0;
uint32_t *out = fb->data + (size_t)(dstY + gy) * fb->width + dstX;
for (int gx = gx0; gx < gx1; gx++) {
uint32_t alpha = in[gx];
if (colorAlpha != 0xFF) alpha = (alpha * colorAlpha + 127) / 255;
if (alpha == 0) continue;
if (alpha == 0xFF) {
out[gx] = 0xFF000000u | baseColor;
continue;
}
uint32_t dst = out[gx];
uint32_t inv = 255 - alpha;
uint32_t r = (((baseColor >> 16) & 0xFF) * alpha + ((dst >> 16) & 0xFF) * inv) / 255;
uint32_t g = (((baseColor >> 8) & 0xFF) * alpha + ((dst >> 8) & 0xFF) * inv) / 255;
uint32_t b = ((baseColor & 0xFF) * alpha + (dst & 0xFF) * inv) / 255;
out[gx] = (dst & 0xFF000000u) | (r << 16) | (g << 8) | b;
}
}
}
}
void kon_measureText(kon_font_t *font, const char *text, int *outWidth, int *outHeight) {
if (!font || !text) return;
if (font->builtin) {
int count = 0;
for (const char *p = text; *p; p++) {
unsigned char c = (unsigned char)*p;
if (c >= KON_FONT_FIRST_CHAR && c < KON_FONT_FIRST_CHAR + KON_FONT_NUM_CHARS) count++;
}
if (outWidth) *outWidth = count * KON_BUILTIN_WIDTH * font->scale;
if (outHeight) *outHeight = KON_BUILTIN_HEIGHT * font->scale;
return;
}
float cursorX = 0.0f;
float cursorY = 0.0f;
float maxX = 0.0f;
for (const char *p = text; *p; p++) {
unsigned char c = (unsigned char)*p;
if (c < KON_FONT_FIRST_CHAR || c >= KON_FONT_FIRST_CHAR + KON_FONT_NUM_CHARS) continue;
stbtt_aligned_quad q;
stbtt_GetBakedQuad(font->chardata, font->atlasSize, font->atlasSize, c - KON_FONT_FIRST_CHAR, &cursorX, &cursorY, &q, 0);
if (cursorX > maxX) maxX = cursorX;
}
if (outWidth) *outWidth = (int)maxX;
if (outHeight) *outHeight = (int)font->pixelHeight;
}
#endif /* KONFONT_IMPLEMENTATION */
#endif /* KONFONT_H */
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