Add new types for image points, regions

include/cammy/image.h

@@ -31,6 +31,14 @@ typedef struct _cammy_image {
     };
 } cammy_image;
 
+typedef struct _cammy_image_point {
+    size_t x, y;
+} cammy_image_point;
+
+typedef struct _cammy_image_region {
+    size_t x, y, width, height;
+} cammy_image_region;
+
 cammy_image *cammy_image_new(cammy_image_format format,
                              size_t width,
                              size_t height);