diff --git a/include/QF/image.h b/include/QF/image.h
index 7ec7d00dc..2bbf7fb0a 100644
--- a/include/QF/image.h
+++ b/include/QF/image.h
@@ -53,6 +53,8 @@ typedef struct tex_s {
 
 tex_t *LoadImage (const char *imageFile, int load);
 
+size_t ImageSize (const tex_t *tex, int incl_struct) __attribute__((pure));
+
 typedef struct colcache_s colcache_t;
 
 colcache_t *ColorCache_New (void);
diff --git a/libs/image/image.c b/libs/image/image.c
index 4da1e5827..f619727f5 100644
--- a/libs/image/image.c
+++ b/libs/image/image.c
@@ -106,3 +106,31 @@ LoadImage (const char *imageFile, int load)
 	dstring_delete (tmpFile);
 	return (tex);
 }
+
+size_t
+ImageSize (const tex_t *tex, int incl_struct)
+{
+	size_t      w =tex->width;
+	size_t      h =tex->height;
+	size_t      bpp = 1;
+	switch (tex->format) {
+		case tex_palette:
+		case tex_rgb:
+			bpp = 3;
+			break;
+		case tex_l:
+		case tex_a:
+			bpp = 1;
+			break;
+		case tex_la:
+			bpp = 2;
+			break;
+		case tex_rgba:
+			bpp = 4;
+			break;
+		case tex_frgba:
+			bpp = 16;
+			break;
+	}
+	return bpp * w * h + (incl_struct ? sizeof (tex_t) : 0);
+}