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xserver/fb/fbbltone.c

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/*
* Copyright © 1998 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "fb.h"
#ifdef __clang__
/* shift overflow is intentional */
#pragma clang diagnostic ignored "-Wshift-overflow"
#endif
/*
* Example: srcX = 13 dstX = 8 (FB unit 32 dstBpp 8)
*
* **** **** **** **** **** **** **** ****
* ^
* ******** ******** ******** ********
* ^
* leftShift = 12
* rightShift = 20
*
* Example: srcX = 0 dstX = 8 (FB unit 32 dstBpp 8)
*
* **** **** **** **** **** **** **** ****
* ^
* ******** ******** ******** ********
* ^
*
* leftShift = 24
* rightShift = 8
*/
#define LoadBits {\
if (leftShift) { \
bitsRight = (src < srcEnd ? READ(src++) : 0); \
bits = (FbStipLeft (bitsLeft, leftShift) | \
FbStipRight(bitsRight, rightShift)); \
bitsLeft = bitsRight; \
} else \
bits = (src < srcEnd ? READ(src++) : 0); \
}
#define LaneCases1(n,a) case n: FbLaneCase(n,a); break
#define LaneCases2(n,a) LaneCases1(n,a); LaneCases1(n+1,a)
#define LaneCases4(n,a) LaneCases2(n,a); LaneCases2(n+2,a)
#define LaneCases8(n,a) LaneCases4(n,a); LaneCases4(n+4,a)
#define LaneCases16(n,a) LaneCases8(n,a); LaneCases8(n+8,a)
#define LaneCases32(n,a) LaneCases16(n,a); LaneCases16(n+16,a)
#define LaneCases64(n,a) LaneCases32(n,a); LaneCases32(n+32,a)
#define LaneCases128(n,a) LaneCases64(n,a); LaneCases64(n+64,a)
#define LaneCases256(n,a) LaneCases128(n,a); LaneCases128(n+128,a)
#if FB_SHIFT == 6
#define LaneCases(a) LaneCases256(0,a)
#endif
#if FB_SHIFT == 5
#define LaneCases(a) LaneCases16(0,a)
#endif
#if FB_SHIFT == 6
CARD8 fb8Lane[256] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78,
79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97,
98, 99, 100, 101, 102,103,104,105,106,107,108,109,110,111,112,113,114,115,
116, 117, 118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,
134, 135, 136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,
152, 153, 154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,
170, 171, 172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,
188, 189, 190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,
206, 207, 208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,
224, 225, 226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,
242, 243, 244,245,246,247,248,249,250,251,252,253,254,255,
};
CARD8 fb16Lane[256] = {
0x00, 0x03, 0x0c, 0x0f,
0x30, 0x33, 0x3c, 0x3f,
0xc0, 0xc3, 0xcc, 0xcf,
0xf0, 0xf3, 0xfc, 0xff,
};
CARD8 fb32Lane[16] = {
0x00, 0x0f, 0xf0, 0xff,
};
#endif
#if FB_SHIFT == 5
CARD8 fb8Lane[16] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
};
CARD8 fb16Lane[16] = {
0, 3, 12, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
CARD8 fb32Lane[16] = {
0, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
};
#endif
CARD8 *fbLaneTable[33] = {
0, 0, 0, 0, 0, 0, 0, 0,
fb8Lane, 0, 0, 0, 0, 0, 0, 0,
fb16Lane, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
fb32Lane
};
void
fbBltOne (FbStip *src,
FbStride srcStride, /* FbStip units per scanline */
int srcX, /* bit position of source */
FbBits *dst,
FbStride dstStride, /* FbBits units per scanline */
int dstX, /* bit position of dest */
int dstBpp, /* bits per destination unit */
int width, /* width in bits of destination */
int height, /* height in scanlines */
FbBits fgand, /* rrop values */
FbBits fgxor,
FbBits bgand,
FbBits bgxor)
{
const FbBits *fbBits;
FbBits *srcEnd;
int pixelsPerDst; /* dst pixels per FbBits */
int unitsPerSrc; /* src patterns per FbStip */
int leftShift, rightShift; /* align source with dest */
FbBits startmask, endmask; /* dest scanline masks */
FbStip bits=0, bitsLeft, bitsRight;/* source bits */
FbStip left;
FbBits mask;
int nDst; /* dest longwords (w.o. end) */
int w;
int n, nmiddle;
int dstS; /* stipple-relative dst X coordinate */
Bool copy; /* accelerate dest-invariant */
Bool transparent; /* accelerate 0 nop */
int srcinc; /* source units consumed */
Bool endNeedsLoad = FALSE; /* need load for endmask */
CARD8 *fbLane;
int startbyte, endbyte;
if (dstBpp == 24)
{
fbBltOne24 (src, srcStride, srcX,
dst, dstStride, dstX, dstBpp,
width, height,
fgand, fgxor, bgand, bgxor);
return;
}
/*
* Do not read past the end of the buffer!
*/
srcEnd = src + height * srcStride;
/*
* Number of destination units in FbBits == number of stipple pixels
* used each time
*/
pixelsPerDst = FB_UNIT / dstBpp;
/*
* Number of source stipple patterns in FbStip
*/
unitsPerSrc = FB_STIP_UNIT / pixelsPerDst;
copy = FALSE;
transparent = FALSE;
if (bgand == 0 && fgand == 0)
copy = TRUE;
else if (bgand == FB_ALLONES && bgxor == 0)
transparent = TRUE;
/*
* Adjust source and dest to nearest FbBits boundary
*/
src += srcX >> FB_STIP_SHIFT;
dst += dstX >> FB_SHIFT;
srcX &= FB_STIP_MASK;
dstX &= FB_MASK;
FbMaskBitsBytes(dstX, width, copy,
startmask, startbyte, nmiddle, endmask, endbyte);
/*
* Compute effective dest alignment requirement for
* source -- must align source to dest unit boundary
*/
dstS = dstX / dstBpp;
/*
* Compute shift constants for effective alignement
*/
if (srcX >= dstS)
{
leftShift = srcX - dstS;
rightShift = FB_STIP_UNIT - leftShift;
}
else
{
rightShift = dstS - srcX;
leftShift = FB_STIP_UNIT - rightShift;
}
/*
* Get pointer to stipple mask array for this depth
*/
fbBits = 0; /* unused */
if (pixelsPerDst <= 8)
fbBits = fbStippleTable[pixelsPerDst];
fbLane = 0;
if (transparent && fgand == 0 && dstBpp >= 8)
fbLane = fbLaneTable[dstBpp];
/*
* Compute total number of destination words written, but
* don't count endmask
*/
nDst = nmiddle;
if (startmask)
nDst++;
dstStride -= nDst;
/*
* Compute total number of source words consumed
*/
srcinc = (nDst + unitsPerSrc - 1) / unitsPerSrc;
if (srcX > dstS)
srcinc++;
if (endmask)
{
endNeedsLoad = nDst % unitsPerSrc == 0;
if (endNeedsLoad)
srcinc++;
}
srcStride -= srcinc;
/*
* Copy rectangle
*/
while (height--)
{
w = nDst; /* total units across scanline */
n = unitsPerSrc; /* units avail in single stipple */
if (n > w)
n = w;
bitsLeft = 0;
if (srcX > dstS)
bitsLeft = READ(src++);
if (n)
{
/*
* Load first set of stipple bits
*/
LoadBits;
/*
* Consume stipple bits for startmask
*/
if (startmask)
{
#if FB_UNIT > 32
if (pixelsPerDst == 16)
mask = FbStipple16Bits(FbLeftStipBits(bits,16));
else
#endif
mask = fbBits[FbLeftStipBits(bits,pixelsPerDst)];
if (fbLane)
{
fbTransparentSpan (dst, mask & startmask, fgxor, 1);
}
else
{
if (mask || !transparent)
FbDoLeftMaskByteStippleRRop (dst, mask,
fgand, fgxor, bgand, bgxor,
startbyte, startmask);
}
bits = FbStipLeft (bits, pixelsPerDst);
dst++;
n--;
w--;
}
/*
* Consume stipple bits across scanline
*/
for (;;)
{
w -= n;
if (copy)
{
while (n--)
{
#if FB_UNIT > 32
if (pixelsPerDst == 16)
mask = FbStipple16Bits(FbLeftStipBits(bits,16));
else
#endif
mask = fbBits[FbLeftStipBits(bits,pixelsPerDst)];
WRITE(dst, FbOpaqueStipple (mask, fgxor, bgxor));
dst++;
bits = FbStipLeft(bits, pixelsPerDst);
}
}
else
{
if (fbLane)
{
while (bits && n)
{
switch (fbLane[FbLeftStipBits(bits,pixelsPerDst)]) {
LaneCases((CARD8 *) dst);
}
bits = FbStipLeft(bits,pixelsPerDst);
dst++;
n--;
}
dst += n;
}
else
{
while (n--)
{
left = FbLeftStipBits(bits,pixelsPerDst);
if (left || !transparent)
{
mask = fbBits[left];
WRITE(dst, FbStippleRRop (READ(dst), mask,
fgand, fgxor, bgand, bgxor));
}
dst++;
bits = FbStipLeft(bits, pixelsPerDst);
}
}
}
if (!w)
break;
/*
* Load another set and reset number of available units
*/
LoadBits;
n = unitsPerSrc;
if (n > w)
n = w;
}
}
/*
* Consume stipple bits for endmask
*/
if (endmask)
{
if (endNeedsLoad)
{
LoadBits;
}
#if FB_UNIT > 32
if (pixelsPerDst == 16)
mask = FbStipple16Bits(FbLeftStipBits(bits,16));
else
#endif
mask = fbBits[FbLeftStipBits(bits,pixelsPerDst)];
if (fbLane)
{
fbTransparentSpan (dst, mask & endmask, fgxor, 1);
}
else
{
if (mask || !transparent)
FbDoRightMaskByteStippleRRop (dst, mask,
fgand, fgxor, bgand, bgxor,
endbyte, endmask);
}
}
dst += dstStride;
src += srcStride;
}
}
/*
* Crufty macros to initialize the mask array, most of this
* is to avoid compile-time warnings about shift overflow
*/
#if BITMAP_BIT_ORDER == MSBFirst
#define Mask24Pos(x,r) ((x)*24-(r))
#else
#define Mask24Pos(x,r) ((x)*24-((r) ? 24 - (r) : 0))
#endif
#define Mask24Neg(x,r) (Mask24Pos(x,r) < 0 ? -Mask24Pos(x,r) : 0)
#define Mask24Check(x,r) (Mask24Pos(x,r) < 0 ? 0 : \
Mask24Pos(x,r) >= FB_UNIT ? 0 : Mask24Pos(x,r))
#define Mask24(x,r) (Mask24Pos(x,r) < FB_UNIT ? \
(Mask24Pos(x,r) < 0 ? \
0xffffffU >> Mask24Neg (x,r) : \
0xffffffU << Mask24Check(x,r)) : 0)
#define SelMask24(b,n,r) ((((b) >> n) & 1) * Mask24(n,r))
/*
* Untested for MSBFirst or FB_UNIT == 32
*/
#if FB_UNIT == 64
#define C4_24(b,r) \
(SelMask24(b,0,r) | \
SelMask24(b,1,r) | \
SelMask24(b,2,r) | \
SelMask24(b,3,r))
#define FbStip24New(rot) (2 + (rot != 0))
#define FbStip24Len 4
const FbBits fbStipple24Bits[3][1 << FbStip24Len] = {
/* rotate 0 */
{
C4_24( 0, 0), C4_24( 1, 0), C4_24( 2, 0), C4_24( 3, 0),
C4_24( 4, 0), C4_24( 5, 0), C4_24( 6, 0), C4_24( 7, 0),
C4_24( 8, 0), C4_24( 9, 0), C4_24(10, 0), C4_24(11, 0),
C4_24(12, 0), C4_24(13, 0), C4_24(14, 0), C4_24(15, 0),
},
/* rotate 8 */
{
C4_24( 0, 8), C4_24( 1, 8), C4_24( 2, 8), C4_24( 3, 8),
C4_24( 4, 8), C4_24( 5, 8), C4_24( 6, 8), C4_24( 7, 8),
C4_24( 8, 8), C4_24( 9, 8), C4_24(10, 8), C4_24(11, 8),
C4_24(12, 8), C4_24(13, 8), C4_24(14, 8), C4_24(15, 8),
},
/* rotate 16 */
{
C4_24( 0,16), C4_24( 1,16), C4_24( 2,16), C4_24( 3,16),
C4_24( 4,16), C4_24( 5,16), C4_24( 6,16), C4_24( 7,16),
C4_24( 8,16), C4_24( 9,16), C4_24(10,16), C4_24(11,16),
C4_24(12,16), C4_24(13,16), C4_24(14,16), C4_24(15,16),
}
};
#endif
#if FB_UNIT == 32
#define C2_24(b,r) \
(SelMask24(b,0,r) | \
SelMask24(b,1,r))
#define FbStip24Len 2
#if BITMAP_BIT_ORDER == MSBFirst
#define FbStip24New(rot) (1 + (rot == 0))
#else
#define FbStip24New(rot) (1 + (rot == 8))
#endif
const FbBits fbStipple24Bits[3][1 << FbStip24Len] = {
/* rotate 0 */
{
C2_24( 0, 0), C2_24 ( 1, 0), C2_24 ( 2, 0), C2_24 ( 3, 0),
},
/* rotate 8 */
{
C2_24( 0, 8), C2_24 ( 1, 8), C2_24 ( 2, 8), C2_24 ( 3, 8),
},
/* rotate 16 */
{
C2_24( 0,16), C2_24 ( 1,16), C2_24 ( 2,16), C2_24 ( 3,16),
}
};
#endif
#if BITMAP_BIT_ORDER == LSBFirst
#define FbMergeStip24Bits(left, right, new) \
(FbStipLeft (left, new) | FbStipRight ((right), (FbStip24Len - (new))))
#define FbMergePartStip24Bits(left, right, llen, rlen) \
(left | FbStipRight(right, llen))
#else
#define FbMergeStip24Bits(left, right, new) \
((FbStipLeft (left, new) & ((1 << FbStip24Len) - 1)) | right)
#define FbMergePartStip24Bits(left, right, llen, rlen) \
(FbStipLeft(left, rlen) | right)
#endif
#define fbFirstStipBits(len,stip) {\
int __len = (len); \
if (len <= remain) { \
stip = FbLeftStipBits(bits, len); \
} else { \
stip = FbLeftStipBits(bits, remain); \
bits = (src < srcEnd ? READ(src++) : 0); \
__len = (len) - remain; \
stip = FbMergePartStip24Bits(stip, FbLeftStipBits(bits, __len), \
remain, __len); \
remain = FB_STIP_UNIT; \
} \
bits = FbStipLeft (bits, __len); \
remain -= __len; \
}
#define fbInitStipBits(offset,len,stip) {\
bits = FbStipLeft (READ(src++),offset); \
remain = FB_STIP_UNIT - offset; \
fbFirstStipBits(len,stip); \
stip = FbMergeStip24Bits (0, stip, len); \
}
#define fbNextStipBits(rot,stip) {\
int __new = FbStip24New(rot); \
FbStip __right; \
fbFirstStipBits(__new, __right); \
stip = FbMergeStip24Bits (stip, __right, __new); \
rot = FbNext24Rot (rot); \
}
/*
* Use deep mask tables that incorporate rotation, pull
* a variable number of bits out of the stipple and
* reuse the right bits as needed for the next write
*
* Yes, this is probably too much code, but most 24-bpp screens
* have no acceleration so this code is used for stipples, copyplane
* and text
*/
void
fbBltOne24 (FbStip *srcLine,
FbStride srcStride, /* FbStip units per scanline */
int srcX, /* bit position of source */
FbBits *dst,
FbStride dstStride, /* FbBits units per scanline */
int dstX, /* bit position of dest */
int dstBpp, /* bits per destination unit */
int width, /* width in bits of destination */
int height, /* height in scanlines */
FbBits fgand, /* rrop values */
FbBits fgxor,
FbBits bgand,
FbBits bgxor)
{
FbStip *src, *srcEnd;
FbBits leftMask, rightMask, mask;
int nlMiddle, nl;
FbStip stip, bits;
int remain;
int dstS;
int firstlen;
int rot0, rot;
int nDst;
/*
* Do not read past the end of the buffer!
*/
srcEnd = srcLine + height * srcStride;
srcLine += srcX >> FB_STIP_SHIFT;
dst += dstX >> FB_SHIFT;
srcX &= FB_STIP_MASK;
dstX &= FB_MASK;
rot0 = FbFirst24Rot (dstX);
FbMaskBits (dstX, width, leftMask, nlMiddle, rightMask);
dstS = (dstX + 23) / 24;
firstlen = FbStip24Len - dstS;
nDst = nlMiddle;
if (leftMask)
nDst++;
dstStride -= nDst;
/* opaque copy */
if (bgand == 0 && fgand == 0)
{
while (height--)
{
rot = rot0;
src = srcLine;
srcLine += srcStride;
fbInitStipBits (srcX,firstlen, stip);
if (leftMask)
{
mask = fbStipple24Bits[rot >> 3][stip];
WRITE(dst, (READ(dst) & ~leftMask) |
(FbOpaqueStipple (mask,
FbRot24(fgxor, rot),
FbRot24(bgxor, rot))
& leftMask));
dst++;
fbNextStipBits(rot,stip);
}
nl = nlMiddle;
while (nl--)
{
mask = fbStipple24Bits[rot>>3][stip];
WRITE(dst, FbOpaqueStipple (mask,
FbRot24(fgxor, rot),
FbRot24(bgxor, rot)));
dst++;
fbNextStipBits(rot,stip);
}
if (rightMask)
{
mask = fbStipple24Bits[rot >> 3][stip];
WRITE(dst, (READ(dst) & ~rightMask) |
(FbOpaqueStipple (mask,
FbRot24(fgxor, rot),
FbRot24(bgxor, rot))
& rightMask));
}
dst += dstStride;
src += srcStride;
}
}
/* transparent copy */
else if (bgand == FB_ALLONES && bgxor == 0 && fgand == 0)
{
while (height--)
{
rot = rot0;
src = srcLine;
srcLine += srcStride;
fbInitStipBits (srcX, firstlen, stip);
if (leftMask)
{
if (stip)
{
mask = fbStipple24Bits[rot >> 3][stip] & leftMask;
WRITE(dst, (READ(dst) & ~mask) | (FbRot24(fgxor, rot) & mask));
}
dst++;
fbNextStipBits (rot, stip);
}
nl = nlMiddle;
while (nl--)
{
if (stip)
{
mask = fbStipple24Bits[rot>>3][stip];
WRITE(dst, (READ(dst) & ~mask) | (FbRot24(fgxor,rot) & mask));
}
dst++;
fbNextStipBits (rot, stip);
}
if (rightMask)
{
if (stip)
{
mask = fbStipple24Bits[rot >> 3][stip] & rightMask;
WRITE(dst, (READ(dst) & ~mask) | (FbRot24(fgxor, rot) & mask));
}
}
dst += dstStride;
}
}
else
{
while (height--)
{
rot = rot0;
src = srcLine;
srcLine += srcStride;
fbInitStipBits (srcX, firstlen, stip);
if (leftMask)
{
mask = fbStipple24Bits[rot >> 3][stip];
WRITE(dst, FbStippleRRopMask (READ(dst), mask,
FbRot24(fgand, rot),
FbRot24(fgxor, rot),
FbRot24(bgand, rot),
FbRot24(bgxor, rot),
leftMask));
dst++;
fbNextStipBits(rot,stip);
}
nl = nlMiddle;
while (nl--)
{
mask = fbStipple24Bits[rot >> 3][stip];
WRITE(dst, FbStippleRRop (READ(dst), mask,
FbRot24(fgand, rot),
FbRot24(fgxor, rot),
FbRot24(bgand, rot),
FbRot24(bgxor, rot)));
dst++;
fbNextStipBits(rot,stip);
}
if (rightMask)
{
mask = fbStipple24Bits[rot >> 3][stip];
WRITE(dst, FbStippleRRopMask (READ(dst), mask,
FbRot24(fgand, rot),
FbRot24(fgxor, rot),
FbRot24(bgand, rot),
FbRot24(bgxor, rot),
rightMask));
}
dst += dstStride;
}
}
}
/*
* Not very efficient, but simple -- copy a single plane
* from an N bit image to a 1 bit image
*/
void
fbBltPlane (FbBits *src,
FbStride srcStride,
int srcX,
int srcBpp,
FbStip *dst,
FbStride dstStride,
int dstX,
int width,
int height,
FbStip fgand,
FbStip fgxor,
FbStip bgand,
FbStip bgxor,
Pixel planeMask)
{
FbBits *s;
FbBits pm;
FbBits srcMask;
FbBits srcMaskFirst;
FbBits srcMask0 = 0;
FbBits srcBits;
FbStip dstBits;
FbStip *d;
FbStip dstMask;
FbStip dstMaskFirst;
FbStip dstUnion;
int w;
int wt;
int rot0;
if (!width)
return;
src += srcX >> FB_SHIFT;
srcX &= FB_MASK;
dst += dstX >> FB_STIP_SHIFT;
dstX &= FB_STIP_MASK;
w = width / srcBpp;
pm = fbReplicatePixel (planeMask, srcBpp);
if (srcBpp == 24)
{
int w = 24;
rot0 = FbFirst24Rot (srcX);
if (srcX + w > FB_UNIT)
w = FB_UNIT - srcX;
srcMaskFirst = FbRot24(pm,rot0) & FbBitsMask(srcX,w);
}
else
{
rot0 = 0;
srcMaskFirst = pm & FbBitsMask(srcX, srcBpp);
srcMask0 = pm & FbBitsMask(0, srcBpp);
}
dstMaskFirst = FbStipMask(dstX,1);
while (height--)
{
d = dst;
dst += dstStride;
s = src;
src += srcStride;
srcMask = srcMaskFirst;
if (srcBpp == 24)
srcMask0 = FbRot24(pm,rot0) & FbBitsMask(0, srcBpp);
srcBits = READ(s++);
dstMask = dstMaskFirst;
dstUnion = 0;
dstBits = 0;
wt = w;
while (wt--)
{
if (!srcMask)
{
srcBits = READ(s++);
if (srcBpp == 24)
srcMask0 = FbNext24Pix(srcMask0) & FbBitsMask(0,24);
srcMask = srcMask0;
}
if (!dstMask)
{
WRITE(d, FbStippleRRopMask(READ(d), dstBits,
fgand, fgxor, bgand, bgxor,
dstUnion));
d++;
dstMask = FbStipMask(0,1);
dstUnion = 0;
dstBits = 0;
}
if (srcBits & srcMask)
dstBits |= dstMask;
dstUnion |= dstMask;
if (srcBpp == FB_UNIT)
srcMask = 0;
else
srcMask = FbScrRight(srcMask,srcBpp);
dstMask = FbStipRight(dstMask,1);
}
if (dstUnion)
WRITE(d, FbStippleRRopMask(READ(d),dstBits,
fgand, fgxor, bgand, bgxor,
dstUnion));
}
}
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