mirror of
https://github.com/ByteWelder/Tactility.git
synced 2026-10-17 02:45:05 +00:00
4279a8ed72
Features: - Implemented terminal app based on BreezyBox - Implemented shell based on BreezyBox - Added font-module with fixed-width fonts Improvements: - Improved application standard-output and error-output routing, including dynamically loaded applications. - Updated shared icons and Material Symbols mappings. - Other improvements & fixes
35 lines
1.5 KiB
C++
35 lines
1.5 KiB
C++
// SPDX-License-Identifier: Apache-2.0
|
|
#include <font/render.h>
|
|
|
|
#include <cstring>
|
|
|
|
void font_render_char(const FixedWidthFont* font, char ch, uint16_t fg, uint16_t bg, uint16_t* buffer, int stride) {
|
|
// Anything outside the font's range renders as blank rather than as garbage. The comparison
|
|
// uses an unsigned value so that a byte above 0x7F cannot come out negative and pass the
|
|
// lower-bound test.
|
|
const auto raw = static_cast<unsigned char>(ch);
|
|
const unsigned char glyphChar = (raw >= font->first_codepoint && raw <= font->last_codepoint) ? raw : ' ';
|
|
const uint8_t* glyph = &font->glyph_bitmap[(glyphChar - font->first_codepoint) * font->glyph_height * font->glyph_bytes_per_row];
|
|
|
|
for (int y = 0; y < font->glyph_height; y++) {
|
|
const uint8_t* bits = &glyph[y * font->glyph_bytes_per_row];
|
|
uint16_t* out = &buffer[y * stride];
|
|
|
|
for (int x = 0; x < font->glyph_width; x++) {
|
|
// The font stores the leftmost pixel of each row byte in the most significant bit.
|
|
out[x] = (bits[x / 8] & (0x80U >> (x % 8))) ? fg : bg;
|
|
}
|
|
}
|
|
}
|
|
|
|
void font_render_string(const FixedWidthFont* font, const char* str, uint16_t fg, uint16_t bg, uint16_t* buffer, int stride) {
|
|
for (const char* p = str; *p != '\0'; p++) {
|
|
font_render_char(font, *p, fg, bg, buffer, stride);
|
|
buffer += font->glyph_width;
|
|
}
|
|
}
|
|
|
|
int font_get_string_length(const FixedWidthFont* font, const char* str) {
|
|
return static_cast<int>(strlen(str)) * font->glyph_width;
|
|
}
|