142 lines
4.8 KiB
C
142 lines
4.8 KiB
C
// rendering characters in the framebuffer
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#include "engine.h"
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#include <stdint.h>
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/*
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* each character has 8 rows
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* only the lower 4 bits of each byte are used
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*/
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static const uint8_t font[128][FONT_ROWS] = {
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[' '] = { 0, 0, 0, 0, 0, 0, 0 },
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['A'] = { 0x0E, 0x11, 0x11, 0x1F, 0x11, 0x11, 0x11 },
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['B'] = { 0x1E, 0x11, 0x11, 0x1E, 0x11, 0x11, 0x1E },
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['C'] = { 0x0F, 0x10, 0x10, 0x10, 0x10, 0x10, 0x0F },
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['D'] = { 0x1E, 0x11, 0x11, 0x11, 0x11, 0x11, 0x1E },
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['E'] = { 0x1F, 0x10, 0x10, 0x1E, 0x10, 0x10, 0x1F },
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['F'] = { 0x1F, 0x10, 0x10, 0x1E, 0x10, 0x10, 0x10 },
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['G'] = { 0x0F, 0x10, 0x10, 0x17, 0x11, 0x11, 0x0F },
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['H'] = { 0x11, 0x11, 0x11, 0x1F, 0x11, 0x11, 0x11 },
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['I'] = { 0x1F, 0x04, 0x04, 0x04, 0x04, 0x04, 0x1F },
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['J'] = { 0x01, 0x01, 0x01, 0x01, 0x11, 0x11, 0x0E },
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['K'] = { 0x11, 0x12, 0x14, 0x18, 0x14, 0x12, 0x11 },
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['L'] = { 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x1F },
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['M'] = { 0x11, 0x1B, 0x15, 0x15, 0x11, 0x11, 0x11 },
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['N'] = { 0x11, 0x19, 0x15, 0x13, 0x11, 0x11, 0x11 },
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['O'] = { 0x0E, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0E },
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['P'] = { 0x1E, 0x11, 0x11, 0x1E, 0x10, 0x10, 0x10 },
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['Q'] = { 0x0E, 0x11, 0x11, 0x11, 0x15, 0x12, 0x0D },
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['R'] = { 0x1E, 0x11, 0x11, 0x1E, 0x14, 0x12, 0x11 },
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['S'] = { 0x0F, 0x10, 0x10, 0x0E, 0x01, 0x01, 0x1E },
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['T'] = { 0x1F, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04 },
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['U'] = { 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x0E },
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['V'] = { 0x11, 0x11, 0x11, 0x11, 0x11, 0x0A, 0x04 },
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['W'] = { 0x11, 0x11, 0x11, 0x15, 0x15, 0x15, 0x0A },
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['X'] = { 0x11, 0x11, 0x0A, 0x04, 0x0A, 0x11, 0x11 },
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['Y'] = { 0x11, 0x11, 0x0A, 0x04, 0x04, 0x04, 0x04 },
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['Z'] = { 0x1F, 0x01, 0x02, 0x04, 0x08, 0x10, 0x1F },
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['0'] = { 0x0E, 0x11, 0x13, 0x15, 0x19, 0x11, 0x0E },
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['1'] = { 0x04, 0x0C, 0x04, 0x04, 0x04, 0x04, 0x0E },
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['2'] = { 0x0E, 0x11, 0x01, 0x02, 0x04, 0x08, 0x1F },
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['3'] = { 0x1E, 0x01, 0x01, 0x0E, 0x01, 0x01, 0x1E },
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['4'] = { 0x02, 0x06, 0x0A, 0x12, 0x1F, 0x02, 0x02 },
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['5'] = { 0x1F, 0x10, 0x10, 0x1E, 0x01, 0x01, 0x1E },
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['6'] = { 0x0E, 0x10, 0x10, 0x1E, 0x11, 0x11, 0x0E },
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['7'] = { 0x1F, 0x01, 0x02, 0x04, 0x08, 0x08, 0x08 },
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['8'] = { 0x0E, 0x11, 0x11, 0x0E, 0x11, 0x11, 0x0E },
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['9'] = { 0x0E, 0x11, 0x11, 0x0F, 0x01, 0x01, 0x0E },
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['.'] = { 0, 0, 0, 0, 0, 0x0C, 0x0C },
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[','] = { 0, 0, 0, 0, 0, 0x0C, 0x08 },
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[':'] = { 0, 0x0C, 0x0C, 0, 0, 0x0C, 0x0C },
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[';'] = { 0, 0x0C, 0x0C, 0, 0, 0x0C, 0x08 },
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['!'] = { 0x04, 0x04, 0x04, 0x04, 0x04, 0, 0x04 },
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['?'] = { 0x0E, 0x11, 0x01, 0x02, 0x04, 0, 0x04 },
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['-'] = { 0, 0, 0, 0x1F, 0, 0, 0 },
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['_'] = { 0, 0, 0, 0, 0, 0, 0x1F },
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['+'] = { 0, 0x04, 0x04, 0x1F, 0x04, 0x04, 0 },
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['='] = { 0, 0x1F, 0, 0, 0x1F, 0, 0 },
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['/'] = { 0x01, 0x01, 0x02, 0x04, 0x08, 0x10, 0x10 },
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['\\'] = { 0x10, 0x10, 0x08, 0x04, 0x02, 0x01, 0x01 },
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['('] = { 0x02, 0x04, 0x08, 0x08, 0x08, 0x04, 0x02 },
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[')'] = { 0x08, 0x04, 0x02, 0x02, 0x02, 0x04, 0x08 },
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['['] = { 0x0E, 0x08, 0x08, 0x08, 0x08, 0x08, 0x0E },
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[']'] = { 0x0E, 0x02, 0x02, 0x02, 0x02, 0x02, 0x0E },
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['<'] = { 0x02, 0x04, 0x08, 0x10, 0x08, 0x04, 0x02 },
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['>'] = { 0x08, 0x04, 0x02, 0x01, 0x02, 0x04, 0x08 },
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['*'] = { 0, 0x15, 0x0E, 0x1F, 0x0E, 0x15, 0 },
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['#'] = { 0x0A, 0x0A, 0x1F, 0x0A, 0x1F, 0x0A, 0x0A },
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['%'] = { 0x19, 0x19, 0x02, 0x04, 0x08, 0x13, 0x13 },
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['@'] = { 0x0E, 0x11, 0x17, 0x15, 0x17, 0x10, 0x0F }
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};
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/**
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* put a char 'c' on 'x' and 'y' in the framebuffer
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* with a foreground color of 'color'
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*/
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void
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put_char(
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char c,
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uint32_t x,
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uint32_t y,
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uint32_t size,
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uint32_t fg_color,
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uint32_t bg_color
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) {
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// convert lowercase letters to uppercase
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if (c >= 'a' && c <= 'z') {
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c -= 'a' - 'A';
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}
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// avoid indexing outside font[128]
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if ((unsigned char)c >= 128) {
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c = '?';
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}
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for (uint32_t row = 0; row < FONT_ROWS; row++) {
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uint8_t bits = font[(unsigned char)c][row];
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for (uint32_t col = 0; col < FONT_COLS; col++) {
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uint32_t color =
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bits & (1u << (FONT_COLS - 1 - col))
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? fg_color : bg_color;
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put_rect(
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x + col * size,
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y + row * size,
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size,
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size,
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color
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);
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}
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}
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}
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void
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put_string(
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const char *text,
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uint32_t x,
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uint32_t y,
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uint32_t size,
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uint32_t spacing,
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uint32_t line_spacing,
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uint32_t fg_color,
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uint32_t bg_color
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) {
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uint32_t start_x = x;
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while (*text) {
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if (*text == '\n') {
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x = start_x;
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y += (FONT_ROWS + line_spacing) * size;
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} else {
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put_char(*text, x, y, size, fg_color, bg_color);
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x += (FONT_COLS + spacing) * size;
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}
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text++;
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}
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}
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