diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index e5b0cfb653..d8633c9883 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -402,7 +402,54 @@ static const cirrus_bitblt_rop_t cirrus_bkwd_rop[16] = {
     cirrus_bitblt_rop_bkwd_notsrc_or_dst,
     cirrus_bitblt_rop_bkwd_notsrc_and_notdst,
 };
-    
+
+#define TRANSP_ROP(name) {\
+    name ## _8,\
+    name ## _16,\
+        }
+#define TRANSP_NOP(func) {\
+    func,\
+    func,\
+        }
+
+static const cirrus_bitblt_rop_t cirrus_fwd_transp_rop[16][2] = {
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_0),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src_and_dst),
+    TRANSP_NOP(cirrus_bitblt_rop_nop),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src_and_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_1),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_notsrc_and_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src_xor_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src_or_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_notsrc_or_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src_notxor_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_src_or_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_notsrc),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_notsrc_or_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_fwd_transp_notsrc_and_notdst),
+};
+
+static const cirrus_bitblt_rop_t cirrus_bkwd_transp_rop[16][2] = {
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_0),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src_and_dst),
+    TRANSP_NOP(cirrus_bitblt_rop_nop),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src_and_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_1),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_notsrc_and_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src_xor_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src_or_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_notsrc_or_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src_notxor_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_src_or_notdst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_notsrc),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_notsrc_or_dst),
+    TRANSP_ROP(cirrus_bitblt_rop_bkwd_transp_notsrc_and_notdst),
+};
+
 #define ROP2(name) {\
     name ## _8,\
     name ## _16,\
@@ -950,15 +997,28 @@ static void cirrus_bitblt_start(CirrusVGAState * s)
                 s->cirrus_rop = cirrus_patternfill[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1];
             }
         } else {
-            if (s->cirrus_blt_mode & CIRRUS_BLTMODE_BACKWARDS) {
-                s->cirrus_blt_dstpitch = -s->cirrus_blt_dstpitch;
-                s->cirrus_blt_srcpitch = -s->cirrus_blt_srcpitch;
-                s->cirrus_rop = cirrus_bkwd_rop[rop_to_index[blt_rop]];
-            } else {
-                s->cirrus_rop = cirrus_fwd_rop[rop_to_index[blt_rop]];
-            }
-        }
-        
+	    if (s->cirrus_blt_mode & CIRRUS_BLTMODE_TRANSPARENTCOMP) {
+		if (s->cirrus_blt_pixelwidth > 2) {
+		    printf("src transparent without colorexpand must be 8bpp or 16bpp\n");
+		    goto bitblt_ignore;
+		}
+		if (s->cirrus_blt_mode & CIRRUS_BLTMODE_BACKWARDS) {
+		    s->cirrus_blt_dstpitch = -s->cirrus_blt_dstpitch;
+		    s->cirrus_blt_srcpitch = -s->cirrus_blt_srcpitch;
+		    s->cirrus_rop = cirrus_bkwd_transp_rop[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1];
+		} else {
+		    s->cirrus_rop = cirrus_fwd_transp_rop[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1];
+		}
+	    } else {
+		if (s->cirrus_blt_mode & CIRRUS_BLTMODE_BACKWARDS) {
+		    s->cirrus_blt_dstpitch = -s->cirrus_blt_dstpitch;
+		    s->cirrus_blt_srcpitch = -s->cirrus_blt_srcpitch;
+		    s->cirrus_rop = cirrus_bkwd_rop[rop_to_index[blt_rop]];
+		} else {
+		    s->cirrus_rop = cirrus_fwd_rop[rop_to_index[blt_rop]];
+		}
+	    }
+	}
         // setup bitblt engine.
         if (s->cirrus_blt_mode & CIRRUS_BLTMODE_MEMSYSSRC) {
             if (!cirrus_bitblt_cputovideo(s))
diff --git a/hw/cirrus_vga_rop.h b/hw/cirrus_vga_rop.h
index c54f1258b3..fbee6edeb1 100644
--- a/hw/cirrus_vga_rop.h
+++ b/hw/cirrus_vga_rop.h
@@ -62,6 +62,108 @@ glue(cirrus_bitblt_rop_bkwd_, ROP_NAME)(CirrusVGAState *s,
     }
 }
 
+static void
+glue(glue(cirrus_bitblt_rop_fwd_transp_, ROP_NAME),_8)(CirrusVGAState *s,
+						       uint8_t *dst,const uint8_t *src,
+						       int dstpitch,int srcpitch,
+						       int bltwidth,int bltheight)
+{
+    int x,y;
+    uint8_t p;
+    dstpitch -= bltwidth;
+    srcpitch -= bltwidth;
+    for (y = 0; y < bltheight; y++) {
+        for (x = 0; x < bltwidth; x++) {
+	    p = *dst;
+            ROP_OP(p, *src);
+	    if (p != s->gr[0x34]) *dst = p;
+            dst++;
+            src++;
+        }
+        dst += dstpitch;
+        src += srcpitch;
+    }
+}
+
+static void
+glue(glue(cirrus_bitblt_rop_bkwd_transp_, ROP_NAME),_8)(CirrusVGAState *s,
+							uint8_t *dst,const uint8_t *src,
+							int dstpitch,int srcpitch,
+							int bltwidth,int bltheight)
+{
+    int x,y;
+    uint8_t p;
+    dstpitch += bltwidth;
+    srcpitch += bltwidth;
+    for (y = 0; y < bltheight; y++) {
+        for (x = 0; x < bltwidth; x++) {
+	    p = *dst;
+            ROP_OP(p, *src);
+	    if (p != s->gr[0x34]) *dst = p;
+            dst--;
+            src--;
+        }
+        dst += dstpitch;
+        src += srcpitch;
+    }
+}
+
+static void
+glue(glue(cirrus_bitblt_rop_fwd_transp_, ROP_NAME),_16)(CirrusVGAState *s,
+							uint8_t *dst,const uint8_t *src,
+							int dstpitch,int srcpitch,
+							int bltwidth,int bltheight)
+{
+    int x,y;
+    uint8_t p1, p2;
+    dstpitch -= bltwidth;
+    srcpitch -= bltwidth;
+    for (y = 0; y < bltheight; y++) {
+        for (x = 0; x < bltwidth; x+=2) {
+	    p1 = *dst;
+	    p2 = *(dst+1);
+            ROP_OP(p1, *src);
+            ROP_OP(p2, *(src+1));
+	    if ((p1 != s->gr[0x34]) || (p2 != s->gr[0x35])) {
+		*dst = p1;
+		*(dst+1) = p2;
+	    }
+            dst+=2;
+            src+=2;
+        }
+        dst += dstpitch;
+        src += srcpitch;
+    }
+}
+
+static void
+glue(glue(cirrus_bitblt_rop_bkwd_transp_, ROP_NAME),_16)(CirrusVGAState *s,
+							 uint8_t *dst,const uint8_t *src,
+							 int dstpitch,int srcpitch,
+							 int bltwidth,int bltheight)
+{
+    int x,y;
+    uint8_t p1, p2;
+    dstpitch += bltwidth;
+    srcpitch += bltwidth;
+    for (y = 0; y < bltheight; y++) {
+        for (x = 0; x < bltwidth; x+=2) {
+	    p1 = *(dst-1);
+	    p2 = *dst;
+            ROP_OP(p1, *(src-1));
+            ROP_OP(p2, *src);
+	    if ((p1 != s->gr[0x34]) || (p2 != s->gr[0x35])) {
+		*(dst-1) = p1;
+		*dst = p2;
+	    }
+            dst-=2;
+            src-=2;
+        }
+        dst += dstpitch;
+        src += srcpitch;
+    }
+}
+
 #define DEPTH 8
 #include "cirrus_vga_rop2.h"