[[ Cleanup ]] Prevent a large number of unused variable warnings.

peter-b · peter-b · commit 1271c1f6f5b3 · 2014-11-14T13:25:42.000Z
In the advanced_imaging_combiner() template function, two alpha
channel variables were being set while decomposing colour information
but were not being used.  Since it makes sense to decompose all
channels, even if not all channels are needed, add ATTRIBUTE_UNUSED.

This prevents a set-but-unused warning from being emitted for every
single instance of the template.
diff --git a/engine/src/combiners.cpp b/engine/src/combiners.cpp
@@ -655,8 +655,8 @@ template<int x_combiner, bool x_dst_alpha, bool x_src_alpha> INLINE uint32_t adv
 	uint16_t t_dst_alpha_src_red, t_dst_alpha_src_green, t_dst_alpha_src_blue, t_dst_alpha_src_alpha, t_dst_alpha_dst_alpha;
 	uint16_t t_dst_alpha_dst_red, t_dst_alpha_dst_green, t_dst_alpha_dst_blue;
 	uint16_t t_src_alpha_dst_red, t_src_alpha_dst_green, t_src_alpha_dst_blue, t_src_alpha_dst_alpha;
-	uint16_t t_inv_dst_alpha_src_red, t_inv_dst_alpha_src_green, t_inv_dst_alpha_src_blue, t_inv_dst_alpha_src_alpha;
-	uint16_t t_inv_src_alpha_dst_red, t_inv_src_alpha_dst_green, t_inv_src_alpha_dst_blue, t_inv_src_alpha_dst_alpha;
+	uint16_t t_inv_dst_alpha_src_red, t_inv_dst_alpha_src_green, t_inv_dst_alpha_src_blue, t_inv_dst_alpha_src_alpha ATTRIBUTE_UNUSED;
+	uint16_t t_inv_src_alpha_dst_red, t_inv_src_alpha_dst_green, t_inv_src_alpha_dst_blue, t_inv_src_alpha_dst_alpha ATTRIBUTE_UNUSED;
 	uint32_t t_dst_alpha_dst_alpha_src_alpha;
 	uint8_t t_red, t_green, t_blue, t_alpha;
 
