[Anniversary] [th01] Sariel: Restore the full spawn cross animation

Part of P0234, funded by Ember2528.

th01/main/boss/b20m.cpp

@@ -1076,25 +1076,15 @@ void near pattern_birds_on_ellipse_arc(void)
 			spawner_left.v += spawner_velocity_x.v;
 			spawner_top.v += spawner_velocity_y.v;
 
-			// ZUN bug: ZUN suddenly forgot that [spawner] uses subpixels, not
-			// pixels. Comparing its position to the pixel equivalent of
-			// 	((RES_X - SPAWNCROSS_W), (RES_Y - SPAWNCROSS_H))
-			// effectively clips the top-left coordinate of the spawner to a
-			// screen-space rectangle from (0, 0) to (38, 23). Since that's
-			// quite far from its actual position, the code below never gets
-			// executed.
 			if(overlap_xy_lrtb_le_ge(
 				spawner_left, spawner_top,
 				0, 0,
-				(RES_X - SPAWNCROSS_W), // should be subpixels
-				(RES_Y - SPAWNCROSS_H) // should be subpixels
+				to_sp(RES_X - SPAWNCROSS_W),
+				to_sp(RES_Y - SPAWNCROSS_H)
 			)) {
-				// ZUN bug: Also, here. Quite ironic given that there's a
-				// correct version of this blitting call above… Copy-pasta
-				// confirmed.
 				grc_put_8(
-					spawner_left, // should be pixels
-					spawner_top, // should be pixels
+					spawner_left.to_pixel(), // should be pixels
+					spawner_top.to_pixel(), // should be pixels
 					GRC_SLOT_SPAWNCROSS,
 					(boss_phase_frame % SPAWNCROSS_CELS),
 					((boss_phase_frame % 4) + 2)