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-rw-r--r--example/.gitignore2
-rwxr-xr-xexample/empty_examplebin17240 -> 0 bytes
-rw-r--r--example/empty_example.c7
-rw-r--r--example/line.c26
-rw-r--r--fbgl.h122
5 files changed, 118 insertions, 39 deletions
diff --git a/example/.gitignore b/example/.gitignore
new file mode 100644
index 0000000..07ac165
--- /dev/null
+++ b/example/.gitignore
@@ -0,0 +1,2 @@
+build/
+core.*
diff --git a/example/empty_example b/example/empty_example
deleted file mode 100755
index cf2f9a0..0000000
--- a/example/empty_example
+++ /dev/null
Binary files differ
diff --git a/example/empty_example.c b/example/empty_example.c
index 9ef21b3..aee9232 100644
--- a/example/empty_example.c
+++ b/example/empty_example.c
@@ -16,8 +16,8 @@ int main()
fprintf(stdout, "Error: could not open framebuffer device\n");
return -1;
}
+ int color = 0x00000000;
- fbgl_set_bg(&buffer, 0xFFFFFF); // Set background color to red
FT_Library library = fbgl_freetype_init();
if (!library) {
@@ -38,10 +38,15 @@ int main()
// Main loop checking for ESC key
int l = 0;
while (1) {
+
if (fbgl_check_esc_key()) {
fprintf(stdout, "ESC pressed\n");
break;
}
+ //fbgl_set_bg(&buffer, i++); // Set background color to
+ for(int i = 0x000000; i <= 0xFFFFFF; i++) {
+ fbgl_set_bg(&buffer, i);
+ }
}
fbgl_destroy(&buffer);
return 0;
diff --git a/example/line.c b/example/line.c
new file mode 100644
index 0000000..9d937cd
--- /dev/null
+++ b/example/line.c
@@ -0,0 +1,26 @@
+#define FBGL_IMPLEMENTATION
+#include "../fbgl.h"
+
+int main(int argc, char *argv[])
+{
+ fbgl_t buffer;
+ if (fbgl_init("/dev/fb0", &buffer) == -1) {
+ fprintf(stdout, "Error: could not open framebuffer device\n");
+ return -1;
+ }
+
+ fbgl_set_bg(&buffer, 0xFF0000);
+ fbgl_point_t start = { 0, 0 };
+ fbgl_point_t end = { 1020, 1020};
+ for(int i = 0; i < 1890; i++) {
+ start.x = i;
+ fbgl_draw_line(start, end, 0xFFFFFF, &buffer);
+ for(int j = 0; j < 10000000; j++){}
+ }
+ fbgl_draw_line(start, end, 0x000000, &buffer);
+
+ while (1) {
+ }
+
+ return 0;
+}
diff --git a/fbgl.h b/fbgl.h
index 9fb6948..bf9e928 100644
--- a/fbgl.h
+++ b/fbgl.h
@@ -58,6 +58,11 @@ typedef struct fbgl_psf2_header {
uint8_t *glyphs; // Pointer to the glyph data
} fbgl_psf2_header_t;
+typedef struct fbgl_point {
+ size_t x;
+ size_t y;
+} fbgl_point_t;
+
#ifdef FBGL_HIDE_CURSOR
#include <linux/kd.h>
int fbgl_hide_cursor(int fd)
@@ -82,8 +87,10 @@ int fbgl_hide_cursor(int fd)
#ifdef FBGL_USE_FREETYPE
FT_Library fbgl_freetype_init();
void fbgl_freetype_cleanup(FT_Library library);
-FT_Face fbgl_load_font(FT_Library library, const char *font_path, int font_size);
-void fbgl_render_freetype_text(fbgl_t *fb, FT_Library library, FT_Face face, const char *text, int x, int y);
+FT_Face fbgl_load_font(FT_Library library, const char *font_path,
+ int font_size);
+void fbgl_render_freetype_text(fbgl_t *fb, FT_Library library, FT_Face face,
+ const char *text, int x, int y);
#endif //FBGL_USE_FREETYPE
#ifdef __cplusplus
@@ -110,7 +117,7 @@ void fbgl_destroy(fbgl_t *fb);
*/
void fbgl_clear(uint32_t color);
void fbgl_put_pixel(int x, int y, uint32_t color, fbgl_t *fb);
-void fbgl_draw_line(int x0, int y0, int x1, int y1, uint32_t color);
+void fbgl_draw_line(fbgl_point_t x, fbgl_point_t y, uint32_t color, fbgl_t* fb);
void fbgl_set_bg();
/**
@@ -305,50 +312,89 @@ void fbgl_set_signal_handlers()
#endif
#ifdef FBGL_USE_FREETYPE
-FT_Library fbgl_freetype_init() {
- FT_Library library;
- if (FT_Init_FreeType(&library)) {
- fprintf(stderr, "Could not init FreeType Library\n");
- return NULL;
- }
- return library;
+FT_Library fbgl_freetype_init()
+{
+ FT_Library library;
+ if (FT_Init_FreeType(&library)) {
+ fprintf(stderr, "Could not init FreeType Library\n");
+ return NULL;
+ }
+ return library;
}
-void fbgl_freetype_cleanup(FT_Library library) {
- if (library) {
- FT_Done_FreeType(library);
- }
+void fbgl_freetype_cleanup(FT_Library library)
+{
+ if (library) {
+ FT_Done_FreeType(library);
+ }
}
-FT_Face fbgl_load_font(FT_Library library, const char *font_path, int font_size) {
- FT_Face face;
- if (FT_New_Face(library, font_path, 0, &face)) {
- fprintf(stderr, "Could not open font: %s\n", font_path);
- return NULL;
- }
- FT_Set_Pixel_Sizes(face, 0, font_size); // Set font size
- return face;
+FT_Face fbgl_load_font(FT_Library library, const char *font_path, int font_size)
+{
+ FT_Face face;
+ if (FT_New_Face(library, font_path, 0, &face)) {
+ fprintf(stderr, "Could not open font: %s\n", font_path);
+ return NULL;
+ }
+ FT_Set_Pixel_Sizes(face, 0, font_size); // Set font size
+ return face;
}
-void fbgl_render_freetype_text(fbgl_t *fb, FT_Library library, FT_Face face, const char *text, int x, int y) {
- while (*text) {
- FT_Load_Char(face, *text, FT_LOAD_RENDER);
- FT_Bitmap bitmap = face->glyph->bitmap;
-
- // Draw the bitmap to framebuffer
- for (int j = 0; j < bitmap.rows; j++) {
- for (int i = 0; i < bitmap.width; i++) {
- if (bitmap.buffer[j * bitmap.width + i]) { // Check pixel is not empty
- fbgl_put_pixel(x + i, y + j, 0xFF0000, fb); // Draw white pixel
- }
- }
- }
- x += face->glyph->advance.x >> 6; // Move to the next character position
- ++text;
- }
+void fbgl_render_freetype_text(fbgl_t *fb, FT_Library library, FT_Face face,
+ const char *text, int x, int y)
+{
+ while (*text) {
+ FT_Load_Char(face, *text, FT_LOAD_RENDER);
+ FT_Bitmap bitmap = face->glyph->bitmap;
+
+ // Draw the bitmap to framebuffer
+ for (int j = 0; j < bitmap.rows; j++) {
+ for (int i = 0; i < bitmap.width; i++) {
+ if (bitmap.buffer[j * bitmap.width +
+ i]) { // Check pixel is not empty
+ fbgl_put_pixel(x + i, y + j, 0xFF0000,
+ fb); // Draw white pixel
+ }
+ }
+ }
+ x += face->glyph->advance.x >>
+ 6; // Move to the next character position
+ ++text;
+ }
}
#endif // FBGL_USE_FREETYPE
+void fbgl_draw_line(fbgl_point_t x, fbgl_point_t y, uint32_t color, fbgl_t *buffer)
+{
+ int dx = abs(y.x - x.x);
+ int dy = abs(y.y - x.y);
+
+ int sx = (x.x < y.x) ? 1 : -1;
+ int sy = (x.y < y.y) ? 1 : -1;
+
+ int err = dx - dy;
+
+ while (1) {
+ // Set the pixel at the current position
+ fbgl_put_pixel(x.x, x.y, color, buffer);
+
+ // If we've reached the end point, break
+ if (x.x == y.x && x.y == y.y)
+ break;
+
+ int e2 = 2 * err;
+
+ if (e2 > -dy) {
+ err -= dy;
+ x.x += sx;
+ }
+
+ if (e2 < dx) {
+ err += dx;
+ x.y += sy;
+ }
+ }
+}
#ifdef __cplusplus
} // extern "C"
generated by cgit v1.2.3 (git 2.46.0) at 2026-05-02 18:41:11 +0000