Turn off Antialiasing for Rendering with Palette

[Glenn Wurster]

Authors:
  Doug Paul <doug at elemental.ath.cx>,
  Glenn Wurster <gwurster at scs.carleton.ca>

Description:
* When we are working with a palette, we need to disable antialiasing.
Antialiasing results in a lot of extra colour values which are not
mapped in the palette, causing bad display artifacts.

Changelog:
 * Disable antialiasing when working with the palette

===================================================================
RCS file: /home/wine/wine/dlls/x11drv/xrender.c,v
retrieving revision 1.47
diff -u -u -r1.47 xrender.c
--- dlls/x11drv/xrender.c	11 Aug 2004 23:45:34 -0000	1.47
+++ dlls/x11drv/xrender.c	29 Sep 2004 04:46:49 -0000
@@ -981,10 +981,38 @@
     HRGN saved_region = 0;
     UINT align = GetTextAlign( hdc );
     COLORREF textColor = GetTextColor( hdc );
-
+    BOOL antialias_disabled = FALSE;
+    AA_Type backup_aa = AA_None;
+    
+    textColor = X11DRV_PALETTE_ToPhysical( physDev, textColor );
+    textColor = ((textColor & 0xFF0000) >> 16) |
+                (textColor & 0xFF00) |
+                ((textColor & 0xFF) << 16);
+    
     TRACE("%p, %d, %d, %08x, %p, %s, %d, %p)\n", hdc, x, y, flags,
 	  lprect, debugstr_wn(wstr, count), count, lpDx);
 
+    do {
+        BITMAPOBJ *bmp;
+        HBITMAP hBitmap;
+        
+        hBitmap = GetCurrentObject( physDev->hdc, OBJ_BITMAP );
+        bmp = (BITMAPOBJ *)GDI_GetObjPtr( hBitmap, BITMAP_MAGIC );
+        if (!(bmp && bmp->dib)) {
+          TRACE("bitmap is not a DIB\n");
+          GDI_ReleaseObj( hBitmap );
+          break;
+        }
+
+        if (bmp->dib->dsBmih.biBitCount <= 8 && antialias) {
+          TRACE("Disabling antialiasing\n");
+          antialias = 0;
+          antialias_disabled = TRUE;
+        }
+        
+        GDI_ReleaseObj( hBitmap );
+    } while (0);  
+        
     if(flags & ETO_GLYPH_INDEX)
         glyphs = (LPWORD)wstr;
     else {
@@ -1020,7 +1048,7 @@
 
     if(flags & (ETO_CLIPPED | ETO_OPAQUE)) {
         if(!lprect) {
-	    if(flags & ETO_CLIPPED) return FALSE;
+	    if(flags & ETO_CLIPPED) { retv = FALSE; goto done2; }
 	        GetTextExtentPointI(hdc, glyphs, count, &sz);
 		done_extents = TRUE;
 		rc.left = x;
@@ -1267,6 +1295,10 @@
 
     EnterCriticalSection(&xrender_cs);
     entry = glyphsetCache + physDev->xrender->cache_index;
+    if (antialias_disabled) {
+      backup_aa = entry->aa;
+      entry->aa = AA_None;
+    }
 
     for(idx = 0; idx < count; idx++) {
         if(glyphs[idx] >= entry->nrealized || entry->realized[glyphs[idx]] == FALSE) {
@@ -1274,6 +1306,9 @@
 	}
     }
 
+    if (antialias_disabled) {
+      entry->aa = backup_aa;
+    }
 
     TRACE("Writing %s at %ld,%ld\n", debugstr_wn(wstr,count),
           physDev->org.x + x, physDev->org.y + y);
@@ -1516,6 +1551,8 @@
 done:
     X11DRV_UnlockDIBSection( physDev, TRUE );
     if(glyphs != wstr) HeapFree(GetProcessHeap(), 0, glyphs);
+done2:
+    if (antialias_disabled == TRUE) antialias = 1;
     return retv;
 }