Fix MINIMAL build warnings

fbink.c

@@ -1210,34 +1210,48 @@ static void
 
 // Public convenience wrapper around put/get pixels.
 // Performance is *not* a priority for these, avoid them if at all possible!
-void
-    fbink_put_pixel_gray(uint16_t x, uint16_t y, uint8_t v)
+int
+    fbink_put_pixel_gray(uint16_t x UNUSED_BY_NODRAW, uint16_t y UNUSED_BY_NODRAW, uint8_t v UNUSED_BY_NODRAW)
 {
 #ifdef FBINK_WITH_DRAW
 	const FBInkCoordinates coords = { .x = x, .y = y };
 	FBInkPixel             px     = pack_pixel_from_y8(v);
 	put_pixel(coords, &px, true);
+
+	return EXIT_SUCCESS;
 #else
 	WARN("Drawing primitives are disabled in this FBInk build");
 	return ERRCODE(ENOSYS);
 #endif
 }
 
-void
-    fbink_put_pixel_rgba(uint16_t x, uint16_t y, uint8_t r, uint8_t g, uint8_t b, uint8_t a)
+int
+    fbink_put_pixel_rgba(uint16_t x UNUSED_BY_NODRAW,
+			 uint16_t y UNUSED_BY_NODRAW,
+			 uint8_t r  UNUSED_BY_NODRAW,
+			 uint8_t g  UNUSED_BY_NODRAW,
+			 uint8_t b  UNUSED_BY_NODRAW,
+			 uint8_t a  UNUSED_BY_NODRAW)
 {
 #ifdef FBINK_WITH_DRAW
 	const FBInkCoordinates coords = { .x = x, .y = y };
 	FBInkPixel             px     = pack_pixel_from_rgba(r, g, b, a);
 	put_pixel(coords, &px, true);
+
+	return EXIT_SUCCESS;
 #else
 	WARN("Drawing primitives are disabled in this FBInk build");
 	return ERRCODE(ENOSYS);
 #endif
 }
 
-void
-    fbink_get_pixel(uint16_t x, uint16_t y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a)
+int
+    fbink_get_pixel(uint16_t x UNUSED_BY_NODRAW,
+		    uint16_t y UNUSED_BY_NODRAW,
+		    uint8_t* r UNUSED_BY_NODRAW,
+		    uint8_t* g UNUSED_BY_NODRAW,
+		    uint8_t* b UNUSED_BY_NODRAW,
+		    uint8_t* a UNUSED_BY_NODRAW)
 {
 #ifdef FBINK_WITH_DRAW
 	const FBInkCoordinates coords = { .x = x, .y = y };
@@ -1269,6 +1283,8 @@ void
 			*a = 0xFFu;
 		}
 	}
+
+	return EXIT_SUCCESS;
 #else
 	WARN("Drawing primitives are disabled in this FBInk build");
 	return ERRCODE(ENOSYS);

fbink.h

@@ -1512,20 +1512,20 @@ FBINK_API int fbink_fill_rect_rgba(int fbfd,
 // x:                   x coordinates
 // y:                   y coordinates
 // v:			8-bit luminance value
-FBINK_API void fbink_put_pixel_gray(uint16_t x, uint16_t y, uint8_t v);
+FBINK_API int fbink_put_pixel_gray(uint16_t x, uint16_t y, uint8_t v);
 // r:			8-bit red component value
 // g:			8-bit green component value
 // b:			8-bit blue component value
 // a:			8-bit alpha component value (opaque is 0xFFu).
-FBINK_API void fbink_put_pixel_rgba(uint16_t x, uint16_t y, uint8_t r, uint8_t g, uint8_t b, uint8_t a);
+FBINK_API int fbink_put_pixel_rgba(uint16_t x, uint16_t y, uint8_t r, uint8_t g, uint8_t b, uint8_t a);
 // *r:			out pointer, 8-bit red component value
 // *g:			out pointer, 8-bit green component value
 // *b:			out pointer, 8-bit blue component value
 // *a:			out pointer, 8-bit alpha component value (opaque is 0xFFu).
 // NOTE: If pixelformat is grayscale, r = g = b and a = 0xFF
 // NOTE: Red always means red, if there's a BGR swap involved, it's handled for you.
 //       Similarly, BGR565/RBG565 is unpacked to RGB32.
-FBINK_API void fbink_get_pixel(uint16_t x, uint16_t y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a);
+FBINK_API int fbink_get_pixel(uint16_t x, uint16_t y, uint8_t* r, uint8_t* g, uint8_t* b, uint8_t* a);
 
 // Forcefully wakeup the EPDC (Kobo Mk.8+ only)
 // We've found this to be helpful on a few otherwise crashy devices,