cirrus: stop passing around dst pointers in the blitter

Instead pass around the address (aka offset into vga memory).  Calculate
the pointer in the rop_* functions, after applying the mask to the
address, to make sure the address stays within the valid range.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1489574872-8679-1-git-send-email-kraxel@redhat.com

1 files changed, 49 insertions, 48 deletions

diff --git a/hw/display/cirrus_vga_rop2.h b/hw/display/cirrus_vga_rop2.h
index d28bcc6..bc92f0e 100644
--- a/hw/display/cirrus_vga_rop2.h
+++ b/hw/display/cirrus_vga_rop2.h
@@ -23,27 +23,29 @@
  */
 
 #if DEPTH == 8
-#define PUTPIXEL()    ROP_OP(&d[0], col)
+#define PUTPIXEL(s, a, c)    ROP_OP(s, a, c)
 #elif DEPTH == 16
-#define PUTPIXEL()    ROP_OP_16((uint16_t *)&d[0], col)
+#define PUTPIXEL(s, a, c)    ROP_OP_16(s, a, c)
 #elif DEPTH == 24
-#define PUTPIXEL()    ROP_OP(&d[0], col);        \
-                      ROP_OP(&d[1], (col >> 8)); \
-                      ROP_OP(&d[2], (col >> 16))
+#define PUTPIXEL(s, a, c)    do {          \
+        ROP_OP(s, a,     c);               \
+        ROP_OP(s, a + 1, (col >> 8));      \
+        ROP_OP(s, a + 2, (col >> 16));     \
+    } while (0)
 #elif DEPTH == 32
-#define PUTPIXEL()    ROP_OP_32(((uint32_t *)&d[0]), col)
+#define PUTPIXEL(s, a, c)    ROP_OP_32(s, a, c)
 #else
 #error unsupported DEPTH
 #endif
 
 static void
 glue(glue(glue(cirrus_patternfill_, ROP_NAME), _),DEPTH)
-     (CirrusVGAState * s, uint8_t * dst,
-      const uint8_t * src,
+     (CirrusVGAState *s, uint32_t dstaddr,
+      const uint8_t *src,
       int dstpitch, int srcpitch,
       int bltwidth, int bltheight)
 {
-    uint8_t *d;
+    uint32_t addr;
     int x, y, pattern_y, pattern_pitch, pattern_x;
     unsigned int col;
     const uint8_t *src1;
@@ -63,7 +65,7 @@ glue(glue(glue(cirrus_patternfill_, ROP_NAME), _),DEPTH)
     pattern_y = s->cirrus_blt_srcaddr & 7;
     for(y = 0; y < bltheight; y++) {
         pattern_x = skipleft;
-        d = dst + skipleft;
+        addr = dstaddr + skipleft;
         src1 = src + pattern_y * pattern_pitch;
         for (x = skipleft; x < bltwidth; x += (DEPTH / 8)) {
 #if DEPTH == 8
@@ -82,23 +84,23 @@ glue(glue(glue(cirrus_patternfill_, ROP_NAME), _),DEPTH)
             col = ((uint32_t *)(src1 + pattern_x))[0];
             pattern_x = (pattern_x + 4) & 31;
 #endif
-            PUTPIXEL();
-            d += (DEPTH / 8);
+            PUTPIXEL(s, addr, col);
+            addr += (DEPTH / 8);
         }
         pattern_y = (pattern_y + 1) & 7;
-        dst += dstpitch;
+        dstaddr += dstpitch;
     }
 }
 
 /* NOTE: srcpitch is ignored */
 static void
 glue(glue(glue(cirrus_colorexpand_transp_, ROP_NAME), _),DEPTH)
-     (CirrusVGAState * s, uint8_t * dst,
-      const uint8_t * src,
+     (CirrusVGAState *s, uint32_t dstaddr,
+      const uint8_t *src,
       int dstpitch, int srcpitch,
       int bltwidth, int bltheight)
 {
-    uint8_t *d;
+    uint32_t addr;
     int x, y;
     unsigned bits, bits_xor;
     unsigned int col;
@@ -123,7 +125,7 @@ glue(glue(glue(cirrus_colorexpand_transp_, ROP_NAME), _),DEPTH)
     for(y = 0; y < bltheight; y++) {
         bitmask = 0x80 >> srcskipleft;
         bits = *src++ ^ bits_xor;
-        d = dst + dstskipleft;
+        addr = dstaddr + dstskipleft;
         for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) {
             if ((bitmask & 0xff) == 0) {
                 bitmask = 0x80;
@@ -131,24 +133,24 @@ glue(glue(glue(cirrus_colorexpand_transp_, ROP_NAME), _),DEPTH)
             }
             index = (bits & bitmask);
             if (index) {
-                PUTPIXEL();
+                PUTPIXEL(s, addr, col);
             }
-            d += (DEPTH / 8);
+            addr += (DEPTH / 8);
             bitmask >>= 1;
         }
-        dst += dstpitch;
+        dstaddr += dstpitch;
     }
 }
 
 static void
 glue(glue(glue(cirrus_colorexpand_, ROP_NAME), _),DEPTH)
-     (CirrusVGAState * s, uint8_t * dst,
-      const uint8_t * src,
+     (CirrusVGAState *s, uint32_t dstaddr,
+      const uint8_t *src,
       int dstpitch, int srcpitch,
       int bltwidth, int bltheight)
 {
     uint32_t colors[2];
-    uint8_t *d;
+    uint32_t addr;
     int x, y;
     unsigned bits;
     unsigned int col;
@@ -161,29 +163,29 @@ glue(glue(glue(cirrus_colorexpand_, ROP_NAME), _),DEPTH)
     for(y = 0; y < bltheight; y++) {
         bitmask = 0x80 >> srcskipleft;
         bits = *src++;
-        d = dst + dstskipleft;
+        addr = dstaddr + dstskipleft;
         for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) {
             if ((bitmask & 0xff) == 0) {
                 bitmask = 0x80;
                 bits = *src++;
             }
             col = colors[!!(bits & bitmask)];
-            PUTPIXEL();
-            d += (DEPTH / 8);
+            PUTPIXEL(s, addr, col);
+            addr += (DEPTH / 8);
             bitmask >>= 1;
         }
-        dst += dstpitch;
+        dstaddr += dstpitch;
     }
 }
 
 static void
 glue(glue(glue(cirrus_colorexpand_pattern_transp_, ROP_NAME), _),DEPTH)
-     (CirrusVGAState * s, uint8_t * dst,
-      const uint8_t * src,
+     (CirrusVGAState *s, uint32_t dstaddr,
+      const uint8_t *src,
       int dstpitch, int srcpitch,
       int bltwidth, int bltheight)
 {
-    uint8_t *d;
+    uint32_t addr;
     int x, y, bitpos, pattern_y;
     unsigned int bits, bits_xor;
     unsigned int col;
@@ -207,28 +209,28 @@ glue(glue(glue(cirrus_colorexpand_pattern_transp_, ROP_NAME), _),DEPTH)
     for(y = 0; y < bltheight; y++) {
         bits = src[pattern_y] ^ bits_xor;
         bitpos = 7 - srcskipleft;
-        d = dst + dstskipleft;
+        addr = dstaddr + dstskipleft;
         for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) {
             if ((bits >> bitpos) & 1) {
-                PUTPIXEL();
+                PUTPIXEL(s, addr, col);
             }
-            d += (DEPTH / 8);
+            addr += (DEPTH / 8);
             bitpos = (bitpos - 1) & 7;
         }
         pattern_y = (pattern_y + 1) & 7;
-        dst += dstpitch;
+        dstaddr += dstpitch;
     }
 }
 
 static void
 glue(glue(glue(cirrus_colorexpand_pattern_, ROP_NAME), _),DEPTH)
-     (CirrusVGAState * s, uint8_t * dst,
-      const uint8_t * src,
+     (CirrusVGAState *s, uint32_t dstaddr,
+      const uint8_t *src,
       int dstpitch, int srcpitch,
       int bltwidth, int bltheight)
 {
     uint32_t colors[2];
-    uint8_t *d;
+    uint32_t addr;
     int x, y, bitpos, pattern_y;
     unsigned int bits;
     unsigned int col;
@@ -242,38 +244,37 @@ glue(glue(glue(cirrus_colorexpand_pattern_, ROP_NAME), _),DEPTH)
     for(y = 0; y < bltheight; y++) {
         bits = src[pattern_y];
         bitpos = 7 - srcskipleft;
-        d = dst + dstskipleft;
+        addr = dstaddr + dstskipleft;
         for (x = dstskipleft; x < bltwidth; x += (DEPTH / 8)) {
             col = colors[(bits >> bitpos) & 1];
-            PUTPIXEL();
-            d += (DEPTH / 8);
+            PUTPIXEL(s, addr, col);
+            addr += (DEPTH / 8);
             bitpos = (bitpos - 1) & 7;
         }
         pattern_y = (pattern_y + 1) & 7;
-        dst += dstpitch;
+        dstaddr += dstpitch;
     }
 }
 
 static void
 glue(glue(glue(cirrus_fill_, ROP_NAME), _),DEPTH)
      (CirrusVGAState *s,
-      uint8_t *dst, int dst_pitch,
+      uint32_t dstaddr, int dst_pitch,
       int width, int height)
 {
-    uint8_t *d, *d1;
+    uint32_t addr;
     uint32_t col;
     int x, y;
 
     col = s->cirrus_blt_fgcol;
 
-    d1 = dst;
     for(y = 0; y < height; y++) {
-        d = d1;
+        addr = dstaddr;
         for(x = 0; x < width; x += (DEPTH / 8)) {
-            PUTPIXEL();
-            d += (DEPTH / 8);
+            PUTPIXEL(s, addr, col);
+            addr += (DEPTH / 8);
         }
-        d1 += dst_pitch;
+        dstaddr += dst_pitch;
     }
 }