1 files changed, 50 insertions, 0 deletions
diff --git a/src/user/lib/draw/draw.c b/src/user/lib/draw/draw.c
new file mode 100644
index 0000000..c4508da
--- /dev/null
+++ b/src/user/lib/draw/draw.c
@@ -0,0 +1,50 @@
+#include <camellia/syscalls.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <user/lib/draw/draw.h>
+
+void dirty_reset(struct rect *d) {
+	d->x1 = ~0; d->y1 = ~0;
+	d->x2 =  0; d->y2 =  0;
+}
+
+void dirty_mark(struct rect *d, uint32_t x, uint32_t y) {
+	if (d->x1 > x) d->x1 = x;
+	if (d->x2 < x) d->x2 = x;
+	if (d->y1 > y) d->y1 = y;
+	if (d->y2 < y) d->y2 = y;
+}
+
+int fb_setup(struct framebuf *fb, const char *base) {
+	char path[64], *spec;
+	size_t pos;
+	FILE *f;
+
+	f = fopen(base, "r");
+	if (!f) return -errno;
+
+	pos = strlen(base);
+	memcpy(path, base, pos);
+	spec = path + pos;
+	fread(spec, 1, sizeof(path) - pos, f);
+	/* assumes the read went correctly */
+	fclose(f);
+
+	fb->fd = _syscall_open(path, strlen(path), 0);
+	if (fb->fd < 0) return fb->fd;
+
+	fb->width  = strtol(spec, &spec, 0);
+	if (*spec++ != 'x') return -EINVAL;
+	fb->height = strtol(spec, &spec, 0);
+	if (*spec++ != 'x') return -EINVAL;
+	fb->bpp = strtol(spec, &spec, 0);
+	fb->len = _syscall_getsize(fb->fd);
+	fb->pitch = fb->len / fb->height;
+	fb->b = malloc(fb->len);
+
+	if (fb->bpp != 32) return -EINVAL;
+
+	return 0;
+}