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/*
* Copyright (C) 2021 Mikhail Burakov. This file is part of Pui.
*
* Pui 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 3 of the License, or
* (at your option) any later version.
*
* Pui 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 Pui. If not, see <https://www.gnu.org/licenses/>.
*/
#include "font.h"
extern uint32_t kCp00[256 * 3];
extern uint32_t kCp04[256 * 3];
static int GetUnicode(const char** str) {
const char* character = *str;
if ((character[0] & 0xf8) == 0xf0 && (character[1] & 0xc0) == 0x80 &&
(character[2] & 0xc0) == 0x80 && (character[3] & 0xc0) == 0x80) {
(*str) += 4;
return ((character[0] & 0x07) << 18) | ((character[1] & 0x3f) << 12) |
((character[2] & 0x3f) << 6) | (character[3] & 0x3f);
}
if ((character[0] & 0xf0) == 0xe0 && (character[1] & 0xc0) == 0x80 &&
(character[2] & 0xc0) == 0x80) {
(*str) += 3;
return ((character[0] & 0x0f) << 12) | ((character[1] & 0x3f) << 6) |
(character[2] & 0x3f);
}
if ((character[0] & 0xe0) == 0xc0 && (character[1] & 0xc0) == 0x80) {
(*str) += 2;
return ((character[0] & 0x1f) << 6) | (character[1] & 0x3f);
}
if ((character[0] & 0x80) == 0x00) {
(*str) += 1;
return character[0];
}
return -1;
}
static size_t GlyphWidth(int point) {
const uint32_t* page;
switch (point >> 8) {
case 0:
if (point == 0x20) return 4;
page = kCp00;
break;
case 4:
page = kCp04;
point &= 0xff;
break;
default:
return 0;
}
uint32_t glyph = page[point * 3];
return (glyph >> 24) + 1;
}
static void BlockRender(uint32_t block, uint32_t* buffer, size_t stride,
uint32_t color) {
for (size_t counter = 31; block; block >>= 1, counter--) {
if (!(block & 1)) continue;
size_t x = counter & 0x7u;
size_t y = counter >> 3u;
buffer[x + y * stride] = color;
}
}
static void GlyphRender(int point, uint32_t* buffer, size_t stride,
uint32_t color) {
const uint32_t* page;
switch (point >> 8) {
case 0:
if (point == 0x20) return;
page = kCp00;
break;
case 4:
page = kCp04;
point &= 0xff;
break;
default:
return;
}
const uint32_t* glyph = page + point * 3;
BlockRender(glyph[2], buffer + stride * 7, stride, color);
BlockRender(glyph[1], buffer + stride * 3, stride, color);
BlockRender(glyph[0] & 0xffffff, buffer - stride, stride, color);
}
size_t PuiStringWidth(const char* str) {
size_t result = 0;
for (;;) {
int cp = GetUnicode(&str);
if (cp < 1) break;
result += GlyphWidth(cp);
}
return result;
}
size_t PuiStringCut(const char* str, size_t width) {
size_t result = 0;
for (size_t current = 0;;) {
const char* before = str;
int cp = GetUnicode(&str);
if (cp < 1) break;
current += GlyphWidth(cp);
if (current >= width) break;
result += (size_t)(str - before);
}
return result;
}
void PuiStringRender(const char* str, void* buffer, size_t stride,
uint32_t color) {
for (uint32_t* ptr = buffer;;) {
int cp = GetUnicode(&str);
if (cp < 1) break;
GlyphRender(cp, ptr, stride, color);
ptr += GlyphWidth(cp);
}
}
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