diff options
Diffstat (limited to 'fbgl.h')
| -rw-r--r-- | fbgl.h | 201 |
1 files changed, 150 insertions, 51 deletions
@@ -41,6 +41,18 @@ typedef struct fbgl_window { fbgl_t *fb; // Pointer to the framebuffer context } fbgl_window_t; +typedef struct fbgl_psf2_header { + uint8_t magic[2]; // Magic number, should be {0x72, 0xB5} + uint8_t version; // Version of PSF2 (usually 0) + uint8_t header_size; // Size of the header (usually 32 bytes) + uint16_t flags; // Flags (usually 0) + uint16_t numglyphs; // Number of glyphs (characters) + uint16_t bytes_per_glyph; // Number of bytes per glyph (depends on font size) + uint16_t height; // Height of each character in pixels + uint16_t width; // Width of each character in pixels + uint8_t *glyphs; // Pointer to the glyph data +} fbgl_psf2_header_t; + #ifdef FBGL_HIDE_CURSOR #include <linux/kd.h> int fbgl_hide_cursor(int fd) @@ -75,7 +87,7 @@ void fbgl_enable_raw_mode(); void fbgl_disable_raw_mode(); void fbgl_cleanup(int sig); int fbgl_check_esc_key(); -void fbgl_set_signal_handlers(); +void fbgl_set_signal_handlers(); /*Create and destroy methods*/ int fbgl_init(const char *device, fbgl_t *fb); @@ -101,6 +113,16 @@ uint32_t *fb_get_data(void); int fb_get_width(void); int fb_get_height(void); +/** +* PSF2 Font Methods +*/ +fbgl_psf2_header_t *fbgl_load_psf2_font(const char *font_file); +void fbgl_render_char(fbgl_t *framebuffer, int fb_width, int fb_height, int x, + int y, char ch, fbgl_psf2_header_t *font); +void fbgl_render_text(fbgl_t *framebuffer, int fb_width, int fb_height, int x, + int y, const char *text, fbgl_psf2_header_t *font); +void fbgl_free_psf2_font(fbgl_psf2_header_t *font); + #ifdef FBGL_IMPLEMENTATION char const *fbgl_name_info(void) @@ -139,9 +161,9 @@ int fbgl_init(const char *device, fbgl_t *fb) } #ifdef FBGL_HIDE_CURSOR -fbgl_hide_cursor(fb->fd); - fbgl_set_signal_handlers(); - fbgl_enable_raw_mode(); + fbgl_hide_cursor(fb->fd); + fbgl_set_signal_handlers(); + fbgl_enable_raw_mode(); #endif //FBGL_HIDE_CURSOR fb->width = fb->vinfo.xres; @@ -176,9 +198,9 @@ void fbgl_destroy(fbgl_t *fb) close(fb->fd); fb->fd = -1; - #ifdef FBGL_HIDE_CURSOR +#ifdef FBGL_HIDE_CURSOR fbgl_disable_raw_mode(); - #endif // FBGL_HIDE_CURSOR +#endif // FBGL_HIDE_CURSOR } void fbgl_set_bg(fbgl_t *fb, uint32_t color) @@ -207,76 +229,153 @@ void fbgl_put_pixel(int x, int y, uint32_t color, fbgl_t *fb) size_t index = y * fb->width + x; fb->pixels[index] = color; - } +} - void fbgl_enable_raw_mode() +void fbgl_enable_raw_mode() { - struct termios raw; + struct termios raw; - if (tcgetattr(STDIN_FILENO, &orig_termios) == -1) { - perror("tcgetattr"); - exit(EXIT_FAILURE); - } - raw = orig_termios; - raw.c_lflag &= ~(ECHO | ICANON); - if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) { - perror("tcsetattr"); - exit(EXIT_FAILURE); - } + if (tcgetattr(STDIN_FILENO, &orig_termios) == -1) { + perror("tcgetattr"); + exit(EXIT_FAILURE); + } + raw = orig_termios; + raw.c_lflag &= ~(ECHO | ICANON); + if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) { + perror("tcsetattr"); + exit(EXIT_FAILURE); + } } void fbgl_disable_raw_mode() { - if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1) { - perror("tcsetattr"); - } + if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios) == -1) { + perror("tcsetattr"); + } } void fbgl_cleanup(int sig) { - fbgl_disable_raw_mode(); - printf("\033[2J\033[H"); // Clear the terminal screen and move the cursor to top-left - exit(sig); + fbgl_disable_raw_mode(); + printf("\033[2J\033[H"); // Clear the terminal screen and move the cursor to top-left + exit(sig); } int fbgl_check_esc_key() { - char c; - struct timeval tv = {0, 0}; - fd_set fds; - FD_ZERO(&fds); - FD_SET(STDIN_FILENO, &fds); - - // Check if there's input available - if (select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv) == -1) { - perror("select"); - return 0; + char c; + struct timeval tv = { 0, 0 }; + fd_set fds; + FD_ZERO(&fds); + FD_SET(STDIN_FILENO, &fds); + + // Check if there's input available + if (select(STDIN_FILENO + 1, &fds, NULL, NULL, &tv) == -1) { + perror("select"); + return 0; + } + + if (FD_ISSET(STDIN_FILENO, &fds)) { + if (read(STDIN_FILENO, &c, 1) == -1) { + perror("read"); + return 0; + } + return c == 27; // ASCII value of the `Esc` key + } + + return 0; +} + +void fbgl_set_signal_handlers() +{ + struct sigaction sa; + sa.sa_handler = fbgl_cleanup; + sa.sa_flags = 0; + sigemptyset(&sa.sa_mask); + + if (sigaction(SIGINT, &sa, NULL) == -1 || + sigaction(SIGTERM, &sa, NULL) == -1) { + perror("sigaction"); + exit(EXIT_FAILURE); + } +} + +fbgl_psf2_header_t *fbgl_load_psf2_font(const char *font_file) +{ + fbgl_psf2_header_t *font = NULL; + int fd = open(font_file, O_RDONLY); + if (fd == -1) { + perror("Error opening font file"); + return NULL; + } + + // Read the font header + font = (fbgl_psf2_header_t *)malloc(sizeof(fbgl_psf2_header_t)); + if (read(fd, font, sizeof(fbgl_psf2_header_t)) != + sizeof(fbgl_psf2_header_t)) { + perror("Error reading font header"); + free(font); + close(fd); + return NULL; + } + + // Check magic number + if (font->magic[0] != 0x72 || font->magic[1] != 0xB5) { + fprintf(stderr, "Invalid PSF2 font magic number.\n"); + free(font); + close(fd); + return NULL; + } + + // Read the font glyph data + font->glyphs = + (uint8_t *)malloc(font->numglyphs * font->bytes_per_glyph); + if (read(fd, font->glyphs, font->numglyphs * font->bytes_per_glyph) != + font->numglyphs * font->bytes_per_glyph) { + perror("Error reading glyph data"); + free(font->glyphs); + free(font); + close(fd); + return NULL; + } + + close(fd); + return font; } - if (FD_ISSET(STDIN_FILENO, &fds)) { - if (read(STDIN_FILENO, &c, 1) == -1) { - perror("read"); - return 0; + void fbgl_render_char(fbgl_t *framebuffer, int fb_width, int fb_height, int x, int y, char ch, fbgl_psf2_header_t *font) +{ + if (!framebuffer || !font) return; + + int glyph_idx = (uint8_t)ch; // Get the glyph index for the character + if (glyph_idx >= font->numglyphs) return; + + uint8_t *glyph_data = font->glyphs + (glyph_idx * font->bytes_per_glyph); + for (int j = 0; j < font->height; ++j) { + for (int i = 0; i < font->width; ++i) { + if (glyph_data[j] & (1 << (7 - i))) { + fbgl_put_pixel(x + i, y + j, 0xFFFFFF, framebuffer); + } } - return c == 27; // ASCII value of the `Esc` key } - - return 0; } -void fbgl_set_signal_handlers() +void fbgl_render_text(fbgl_t *framebuffer, int fb_width, int fb_height, int x, int y, const char *text, fbgl_psf2_header_t *font) { - struct sigaction sa; - sa.sa_handler = fbgl_cleanup; - sa.sa_flags = 0; - sigemptyset(&sa.sa_mask); - - if (sigaction(SIGINT, &sa, NULL) == -1 || sigaction(SIGTERM, &sa, NULL) == -1) { - perror("sigaction"); - exit(EXIT_FAILURE); + while (*text) { + fbgl_render_char(framebuffer, fb_width, fb_height, x, y, *text, font); + x += font->width; + ++text; } } +void fbgl_free_psf2_font(fbgl_psf2_header_t *font) +{ + if (font) { + free(font->glyphs); + free(font); + } +} #endif |