Fix endian swaps, so makeobj works on big-endian machines.

Fix simgraph16.cc for big-endian platforms.  The code assumed that
tile_dirty had little-endian byte order.  The assignment to const *sp
was a compiler error.

Index: descriptor/writer/image_writer.cc
--- descriptor/writer/image_writer.cc.orig
+++ descriptor/writer/image_writer.cc
@@ -81,7 +81,7 @@ static uint16 pixrgb_to_pixval(uint32 rgb)
 		// else store color as 3 red, 4, green, 3 red
 		pix = ((rgb >> 14) & 0x0380) | ((rgb >>  9) & 0x0078) | ((rgb >> 5) & 0x07);
 		pix = 0x8020 + 31*31 + pix*31 + alpha;
-		return endian(pix);
+		return pix;
 	}
 
 
@@ -89,7 +89,7 @@ static uint16 pixrgb_to_pixval(uint32 rgb)
 	for (int i = 0; i < SPECIAL; i++) {
 		if (image_t::rgbtab[i] == (uint32)rgb) {
 			pix = 0x8000 + i;
-			return endian(pix);
+			return pix;
 		}
 	}
 
@@ -99,7 +99,7 @@ static uint16 pixrgb_to_pixval(uint32 rgb)
 
 	// RGB 555
 	pix = ((r & 0xF8) << 7) | ((g & 0xF8) << 2) | ((b & 0xF8) >> 3);
-	return endian(pix);
+	return pix;
 }
 
 
@@ -192,8 +192,8 @@ uint16 *image_writer_t::encode_image(int x, int y, dim
 				PIXVAL pixval = pixrgb_to_pixval(pix);
 				if(  pixval >= 0x8020  &&  !has_transparent  ) {
 					if(  count  ) {
-						*colored_run_counter = endian(count);
-						*dest++ = endian(0x8000);
+						*colored_run_counter = endian(uint16(count));
+						*dest++ = endian(uint16(0x8000));
 						colored_run_counter = dest++;
 						count = 0;
 					}
@@ -201,14 +201,14 @@ uint16 *image_writer_t::encode_image(int x, int y, dim
 				}
 				else if(  pixval < 0x8020  &&  has_transparent  ) {
 					if(  count  ) {
-						*colored_run_counter = endian(count+has_transparent);
-						*dest++ = endian(0x8000);
+						*colored_run_counter = endian(uint16(count+has_transparent));
+						*dest++ = endian(uint16(0x8000));
 						colored_run_counter = dest++;
 						count = 0;
 					}
 					has_transparent = 0;
 				}
-				*dest++ = pixval;
+				*dest++ = endian(uint16(pixval));
 				count++;
 				if (row_px_count >= img_width) { // end of line ?
 					break;
@@ -226,7 +226,7 @@ uint16 *image_writer_t::encode_image(int x, int y, dim
 				// this only happens at the end of a line, so no need to increment clear_colored_run_pair_count
 			}
 			else {
-				*colored_run_counter = endian(count + has_transparent);
+				*colored_run_counter = endian(uint16(count + has_transparent));
 				clear_colored_run_pair_count++;
 			}
 		} while(  row_px_count < img_width  );

Index: descriptor/writer/obj_node.cc
--- descriptor/writer/obj_node.cc.orig
+++ descriptor/writer/obj_node.cc
@@ -50,7 +50,7 @@ void obj_node_t::write(FILE* fp)
 		fseek(fp, write_offset - OBJ_NODE_INFO_SIZE, SEEK_SET);
 		uint32 type     = endian(desc.type);
 		uint16 children = endian(desc.children);
-		uint16 size16   = endian(desc.size);
+		uint16 size16   = endian(uint16(desc.size));
 		fwrite(&type, 4, 1, fp);
 		fwrite(&children, 2, 1, fp);
 		fwrite(&size16, 2, 1, fp);
@@ -60,7 +60,7 @@ void obj_node_t::write(FILE* fp)
 		fseek(fp, write_offset - EXT_OBJ_NODE_INFO_SIZE, SEEK_SET);
 		uint32 type     = endian(desc.type);
 		uint16 children = endian(desc.children);
-		uint16 size16   = endian(LARGE_RECORD_SIZE);
+		uint16 size16   = endian(uint16(LARGE_RECORD_SIZE));
 		uint32 size     = endian(desc.size);
 		fwrite(&type, 4, 1, fp);
 		fwrite(&children, 2, 1, fp);

Index: display/simgraph16.cc
--- display/simgraph16.cc.orig
+++ display/simgraph16.cc
@@ -981,7 +981,7 @@ static inline void mark_tile_dirty(const int x, const 
 #if 0
 	assert(bit / 8 < tile_buffer_length);
 #endif
-	((uint8*)tile_dirty)[bit >> 3] |= 1 << (bit & 7);
+	tile_dirty[bit >> 5] |= 1 << (bit & 31);
 }
 
 
@@ -1012,7 +1012,7 @@ static void mark_rect_dirty_nc(KOORD_VAL x1, KOORD_VAL
 		int bit = y1 * tile_buffer_per_line + x1;
 		const int end = bit + x2 - x1;
 		do {
-			((uint8*)tile_dirty)[bit >> 3] |= 1 << (bit & 7);
+			tile_dirty[bit >> 5] |= 1 << (bit & 31);
 		} while(  ++bit <= end  );
 	}
 }
@@ -2485,7 +2485,7 @@ static void display_img_nc(KOORD_VAL h, const KOORD_VA
 #ifdef SIM_BIG_ENDIAN
 					// low level c++ without any unrolling
 					while(  runlen--  ) {
-						*sp++ = *p++;
+						*p++ = *sp++;
 					}
 #else
 					// trying to merge reads and writes