From 99c730ea57a9022357cce87208b5a02c6612c286 Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Sun, 13 Jan 2008 12:05:53 +0100
Subject: [PATCH] automatically detect byteorder of X server

---
 src/sim/g_smmaps.c     | 38 +++++++++++++++++++++-----------------
 src/sim/headers/view.h |  1 +
 src/sim/w_x.c          |  2 ++
 3 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/src/sim/g_smmaps.c b/src/sim/g_smmaps.c
index d2646a6..b29199b 100644
--- a/src/sim/g_smmaps.c
+++ b/src/sim/g_smmaps.c
@@ -84,63 +84,67 @@ int DynamicData[32];
       if (tile >= TILE_COUNT) tile -= TILE_COUNT;
 
 
-#if defined(MSDOS) || defined(OSF1) || defined(IS_INTEL)
-
-#define ROW1_8(n) \
+#define LE_ROW1_8(n) \
       l = mem[n]; \
       image[0] = l; \
       image[1] = l >>8; \
       image[2] = l >>16; \
       image += lineBytes;
 
-#define ROW1_16(n) \
+#define LE_ROW1_16(n) \
       memcpy((char *)image, ((char *)mem) + (n * 4 * 2), (3 * 2)); \
       image += lineBytes;
 
-#define ROW1_24(n) \
+#define LE_ROW1_24(n) \
       memcpy((char *)image, ((char *)mem) + (n * 4 * 3), (3 * 3)); \
       image += lineBytes;
 
-#define ROW1_32(n) \
+#define LE_ROW1_32(n) \
       memcpy((char *)image, ((char *)mem) + (n * 4 * 4), (3 * 4)); \
       image += lineBytes;
 
-#else
-
-#define ROW1_8(n) \
+#define BE_ROW1_8(n) \
       l = mem[n]; \
       image[0] = l >>24; \
       image[1] = l >>16; \
       image[2] = l >>8; \
       image += lineBytes;
 
-#define ROW1_16(n) \
+#define BE_ROW1_16(n) \
       l = mem[n]; /* XXX: WRONG. handle depth */ \
       image[0] = l >>24; \
       image[1] = l >>16; \
       image[2] = l >>8; \
       image += lineBytes;
 
-#define ROW1_24(n) \
+#define BE_ROW1_24(n) \
       l = mem[n]; /* XXX: WRONG. handle depth */ \
       image[0] = l >>24; \
       image[1] = l >>16; \
       image[2] = l >>8; \
       image += lineBytes;
 
-#define ROW1_32(n) \
+#define BE_ROW1_32(n) \
       l = mem[n]; /* XXX: WRONG. handle depth */ \
       image[0] = l >>24; \
       image[1] = l >>16; \
       image[2] = l >>8; \
       image += lineBytes;
 
-#endif
+#define LE_ROW3_8 LE_ROW1_8(0) LE_ROW1_8(1) LE_ROW1_8(2)
+#define LE_ROW3_16 LE_ROW1_16(0) LE_ROW1_16(1) LE_ROW1_16(2)
+#define LE_ROW3_24 LE_ROW1_24(0) LE_ROW1_24(1) LE_ROW1_24(2)
+#define LE_ROW3_32 LE_ROW1_32(0) LE_ROW1_32(1) LE_ROW1_32(2)
+
+#define BE_ROW3_8 BE_ROW1_8(0) BE_ROW1_8(1) BE_ROW1_8(2)
+#define BE_ROW3_16 BE_ROW1_16(0) BE_ROW1_16(1) BE_ROW1_16(2)
+#define BE_ROW3_24 BE_ROW1_24(0) BE_ROW1_24(1) BE_ROW1_24(2)
+#define BE_ROW3_32 BE_ROW1_32(0) BE_ROW1_32(1) BE_ROW1_32(2)
 
-#define ROW3_8 ROW1_8(0) ROW1_8(1) ROW1_8(2)
-#define ROW3_16 ROW1_16(0) ROW1_16(1) ROW1_16(2)
-#define ROW3_24 ROW1_24(0) ROW1_24(1) ROW1_24(2)
-#define ROW3_32 ROW1_32(0) ROW1_32(1) ROW1_32(2)
+#define ROW3_8 if (view->x->big_endian) { BE_ROW3_8 } else { LE_ROW3_8 }
+#define ROW3_16 if (view->x->big_endian) { BE_ROW3_16 } else { LE_ROW3_16 }
+#define ROW3_24 if (view->x->big_endian) { BE_ROW3_24 } else { LE_ROW3_24 }
+#define ROW3_32 if (view->x->big_endian) { BE_ROW3_32 } else { LE_ROW3_32 }
 
 #define ROW3 \
 	  switch (view->x->depth) { \
diff --git a/src/sim/headers/view.h b/src/sim/headers/view.h
index 39931a5..aabdafe 100644
--- a/src/sim/headers/view.h
+++ b/src/sim/headers/view.h
@@ -113,6 +113,7 @@ typedef struct XDisplay {
   Pixmap vert_stipple;
   Pixmap horiz_stipple;
   Pixmap diag_stipple;
+  int big_endian;
 } XDisplay;
 
 
diff --git a/src/sim/w_x.c b/src/sim/w_x.c
index a00d551..76e9ff6 100644
--- a/src/sim/w_x.c
+++ b/src/sim/w_x.c
@@ -584,6 +584,8 @@ InitNewView(SimView *view, char *title, int class, int w, int h)
     view->type = X_Mem_View;
   }
 
+  view->x->big_endian = (ImageByteOrder(view->x->dpy) == MSBFirst);
+
   GetPixmaps(view->x);
   view->pixels = view->x->pixels;
 
-- 
2.39.5