64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
/*
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* font.hpp
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* ZenithOS 8x16 VGA bitmap font rendering
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* Copyright (c) 2025 Daniel Hammer
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*/
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#pragma once
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#include "gui/gui.hpp"
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#include "gui/framebuffer.hpp"
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namespace gui {
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static constexpr int FONT_WIDTH = 8;
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static constexpr int FONT_HEIGHT = 16;
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// Defined in font_data.cpp
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extern const uint8_t font_data[256 * 16];
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inline void draw_char(Framebuffer& fb, int x, int y, char c, Color fg) {
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const uint8_t* glyph = &font_data[(unsigned char)c * FONT_HEIGHT];
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for (int row = 0; row < FONT_HEIGHT; row++) {
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uint8_t bits = glyph[row];
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for (int col = 0; col < FONT_WIDTH; col++) {
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if (bits & (0x80 >> col)) {
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fb.put_pixel(x + col, y + row, fg);
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}
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}
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}
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}
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inline void draw_char_bg(Framebuffer& fb, int x, int y, char c, Color fg, Color bg) {
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const uint8_t* glyph = &font_data[(unsigned char)c * FONT_HEIGHT];
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for (int row = 0; row < FONT_HEIGHT; row++) {
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uint8_t bits = glyph[row];
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for (int col = 0; col < FONT_WIDTH; col++) {
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if (bits & (0x80 >> col)) {
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fb.put_pixel(x + col, y + row, fg);
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} else {
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fb.put_pixel(x + col, y + row, bg);
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}
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}
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}
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}
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inline void draw_text(Framebuffer& fb, int x, int y, const char* text, Color fg) {
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for (int i = 0; text[i]; i++) {
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draw_char(fb, x + i * FONT_WIDTH, y, text[i], fg);
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}
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}
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inline void draw_text_bg(Framebuffer& fb, int x, int y, const char* text, Color fg, Color bg) {
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for (int i = 0; text[i]; i++) {
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draw_char_bg(fb, x + i * FONT_WIDTH, y, text[i], fg, bg);
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}
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}
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inline int text_width(const char* text) {
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int len = 0;
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while (text[len]) len++;
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return len * FONT_WIDTH;
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}
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} // namespace gui
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