[Decompilation] Move palette loops to common macros

You'd really want to overload `operator =` for those.

Part of P0165, funded by Ember2528.

pc98.h

@@ -117,6 +117,25 @@ typedef int8_t uint4_t;
 
 	typedef RGB<uint4_t, 16> RGB4;
 	typedef Palette<RGB4> Palette4;
+
+	#define palette_foreach(tmp_col, tmp_comp, func) { \
+		for(tmp_col = 0; tmp_col < COLOR_COUNT; tmp_col++) { \
+			for(tmp_comp = 0; tmp_comp < COMPONENT_COUNT; tmp_comp++) { \
+				func \
+			} \
+		} \
+	}
+
+	// Sets all components of all colors to the given grayscale [value].
+	#define palette_set_grayscale(dst, value, tmp_col, tmp_comp) \
+		palette_foreach(tmp_col, tmp_comp, { \
+			dst[tmp_col].v[tmp_comp] = value; \
+		})
+
+	#define palette_copy(dst, src, tmp_col, tmp_comp) \
+		palette_foreach(tmp_col, tmp_comp, { \
+			dst[col].v[comp] = src[col].v[comp]; \
+		})
 #endif
 /// --------
 

th01/formats/grp.cpp

@@ -58,11 +58,9 @@ int getkanji(FILE *fp)
 
 void grp_palette_set_all(const Palette4& pal)
 {
-	for(int col = 0; col < COLOR_COUNT; col++) {
-		for(int comp = 0; comp < COMPONENT_COUNT; comp++) {
-			grp_palette[col].v[comp] = pal[col].v[comp];
-		}
-	}
+	int col;
+	int comp;
+	palette_copy(grp_palette, pal, col, comp);
 }
 
 int grp_put_palette_show(const char *fn)

th01/hardware/palette.h

@@ -44,19 +44,16 @@ void z_palette_white_in(void);
 void z_palette_black_out(void);
 void z_palette_white_out(void);
 
-#define z_Palettes_set_func_and_show(tmp_col, tmp_comp, func) \
-	for(tmp_col = 0; tmp_col < COLOR_COUNT; tmp_col++) { \
-		for(tmp_comp = 0; tmp_comp < COMPONENT_COUNT; tmp_comp++) { \
-			func \
-		} \
-	} \
-	z_palette_set_all_show(z_Palettes);
+#define z_Palettes_set_func_and_show(tmp_col, tmp_comp, func) { \
+	palette_foreach(tmp_col, tmp_comp, func); \
+	z_palette_set_all_show(z_Palettes); \
+}
 
 // Sets all colors in both the hardware palette and z_Palettes to #000.
-#define z_palette_set_black(tmp_col, tmp_comp) \
-	z_Palettes_set_func_and_show(tmp_col, tmp_comp, { \
-		z_Palettes[tmp_col].v[tmp_comp] = 0; \
-	})
+#define z_palette_set_black(tmp_col, tmp_comp) { \
+	palette_set_grayscale(z_Palettes, 0, tmp_col, tmp_comp); \
+	z_palette_set_all_show(z_Palettes); \
+}
 
 // Performs a single black-out step.
 #define z_palette_black_out_step(tmp_col, tmp_comp) \

th01/hardware/ptrans_d.cpp

@@ -75,17 +75,15 @@ void pagetrans_diagonal_8x8_with_palette(
 			: (tip_top + INTERLEAVE_H);
 
 		if((frame % (FRAME_COUNT / COLOR_COUNT)) == 0) {
-			for(col = 0; col < COLOR_COUNT; col++) {
 			// Not identical to the ramping loop in z_palette_fade_from()!
-				for(comp = 0; comp < COMPONENT_COUNT; comp++) {
+			palette_foreach(col, comp, {
 				if(pal_cur[col].v[comp] != pal_target[col].v[comp]) {
 					pal_cur.colors[col].v[comp] +=
 						(pal_cur[col].v[comp] > pal_target[col].v[comp])
 						? -1
 						:  1;
 				}
-				}
-			}
+			});
 			z_palette_set_all_show(pal_cur);
 		}
 

th01/main/boss/palette.hpp

@@ -1,12 +1,11 @@
 // The intended palette for a boss, with no effects applied.
 extern Palette4 boss_palette;
 
-#define boss_palette_snap_inlined() \
-	for(int col = 0; col < COLOR_COUNT; col++) { \
-		for(int comp = 0; comp < COMPONENT_COUNT; comp++) { \
-			boss_palette[col].v[comp] = z_Palettes[col].v[comp]; \
-		} \
-	}
+#define boss_palette_snap_inlined() { \
+	int col; \
+	int comp; \
+	palette_copy(boss_palette, z_Palettes, col, comp); \
+}
 
 // Overwrites [boss_palette] with [z_Palettes].
 void boss_palette_snap(void);

th01/main/stage/palette.cpp

@@ -2,9 +2,7 @@
 
 void stage_palette_set(const Palette4 &pal)
 {
-	for(int col = 0; col < COLOR_COUNT; col++) {
-		for(int comp = 0; comp < COMPONENT_COUNT; comp++) {
-			stage_palette[col].v[comp] = pal[col].v[comp];
-		}
-	}
+	int col;
+	int comp;
+	palette_copy(stage_palette, pal, col, comp);
 }