add framebuffer image support

2 files changed, 98 insertions, 0 deletions

diff --git a/lib/ff/ff.c b/lib/ff/ff.c
new file mode 100644
index 0000000..aa85073
--- /dev/null
+++ b/lib/ff/ff.c
@@ -0,0 +1,73 @@
+#include "ff.h"
+#include "../io/io.h"
+#include "../cstr/cstr.h"
+#include "../malloc/malloc.h"
+
+#define MAGIC_VALUE "farbfeld"
+
+u32 conv_to_int(u32 src)
+{
+	return ((src & 0xff) << 24) | ((src & 0xff00) << 8) | ((src & 0xff0000) >> 8) | ((src & 0xff000000) >> 24);
+}
+
+u32 read_u32_from_fd(int fd)
+{
+	u32 src;
+	read(fd, (char *)&src, 4);
+
+	return ((src & 0xff) << 24) | ((src & 0xff00) << 8) | ((src & 0xff0000) >> 8) | ((src & 0xff000000) >> 24);
+}
+
+
+image_t *new_image_from_fd(int fd)
+{
+	image_t *img = malloc(sizeof(image_t));
+	char magic[9] = { 0 };
+
+	read(fd, magic, 8);
+
+	if (cstr_compare(magic, MAGIC_VALUE) != 0) {
+		free(img);
+		return 0;
+	}
+
+	img->width = read_u32_from_fd(fd);
+	img->height = read_u32_from_fd(fd);
+
+	if (img->width * img->height == 0) {
+		free(img);
+		return 0;
+	}
+
+	img->data = malloc(sizeof(image_pixel_t) * img->width * img->height);
+	u64 s = 0;
+	u64 rs = 0;
+	while ((rs = read(fd, (char*)(img->data) + s, sizeof(image_pixel_t) * img->width * img->height - s))) {
+		s += rs;
+	}
+
+	return img;
+}
+
+
+void free_image(image_t *img)
+{
+	free(img->data);
+	free(img);
+}
+
+canvas_pixel_t image_pixel_to_canvas_pixel(image_pixel_t p)
+{
+	canvas_pixel_t cp;
+
+	cp.r = p.r;
+	cp.g = p.g;
+	cp.b = p.b;
+	cp.a = p.a;
+
+	cp.r = (long double)(cp.r) * ((long double)(p.a) / 0xffff);
+	cp.g = (long double)(cp.g) * ((long double)(p.a) / 0xffff);
+	cp.b = (long double)(cp.b) * ((long double)(p.a) / 0xffff);
+
+	return cp;
+}
diff --git a/lib/ff/ff.h b/lib/ff/ff.h
new file mode 100644
index 0000000..756bd16
--- /dev/null
+++ b/lib/ff/ff.h
@@ -0,0 +1,25 @@
+#ifndef FARBFELD_H
+#define FARBFELD_H
+
+#include "../sys/sizes.h"
+#include "../fb/fb.h"
+
+typedef struct {
+	u16 r;
+	u16 g;
+	u16 b;
+	u16 a;
+} image_pixel_t;
+
+typedef struct {
+	u32 width;
+	u32 height;
+	image_pixel_t *data;
+} image_t;
+
+
+image_t        *new_image_from_fd(int fd);
+void           free_image(image_t*);
+canvas_pixel_t image_pixel_to_canvas_pixel(image_pixel_t p);
+
+#endif