xenocara/xserver/fb/fbbltone.c

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24 KiB
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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"
/*
* Stipple masks are independent of bit/byte order as long
* as bitorder == byteorder. FB doesn't handle the case
* where these differ
*/
#define BitsMask(x,w) ((FB_ALLONES << ((x) & FB_MASK)) & \
(FB_ALLONES >> ((FB_UNIT - ((x) + (w))) & FB_MASK)))
#define Mask(x,w) BitsMask((x)*(w),(w))
#define SelMask(b,n,w) ((((b) >> n) & 1) * Mask(n,w))
#define C1(b,w) \
(SelMask(b,0,w))
#define C2(b,w) \
(SelMask(b,0,w) | \
SelMask(b,1,w))
#define C4(b,w) \
(SelMask(b,0,w) | \
SelMask(b,1,w) | \
SelMask(b,2,w) | \
SelMask(b,3,w))
#define C8(b,w) \
(SelMask(b,0,w) | \
SelMask(b,1,w) | \
SelMask(b,2,w) | \
SelMask(b,3,w) | \
SelMask(b,4,w) | \
SelMask(b,5,w) | \
SelMask(b,6,w) | \
SelMask(b,7,w))
static const FbBits fbStipple8Bits[256] = {
C8(0, 4), C8(1, 4), C8(2, 4), C8(3, 4), C8(4, 4), C8(5, 4),
C8(6, 4), C8(7, 4), C8(8, 4), C8(9, 4), C8(10, 4), C8(11, 4),
C8(12, 4), C8(13, 4), C8(14, 4), C8(15, 4), C8(16, 4), C8(17, 4),
C8(18, 4), C8(19, 4), C8(20, 4), C8(21, 4), C8(22, 4), C8(23, 4),
C8(24, 4), C8(25, 4), C8(26, 4), C8(27, 4), C8(28, 4), C8(29, 4),
C8(30, 4), C8(31, 4), C8(32, 4), C8(33, 4), C8(34, 4), C8(35, 4),
C8(36, 4), C8(37, 4), C8(38, 4), C8(39, 4), C8(40, 4), C8(41, 4),
C8(42, 4), C8(43, 4), C8(44, 4), C8(45, 4), C8(46, 4), C8(47, 4),
C8(48, 4), C8(49, 4), C8(50, 4), C8(51, 4), C8(52, 4), C8(53, 4),
C8(54, 4), C8(55, 4), C8(56, 4), C8(57, 4), C8(58, 4), C8(59, 4),
C8(60, 4), C8(61, 4), C8(62, 4), C8(63, 4), C8(64, 4), C8(65, 4),
C8(66, 4), C8(67, 4), C8(68, 4), C8(69, 4), C8(70, 4), C8(71, 4),
C8(72, 4), C8(73, 4), C8(74, 4), C8(75, 4), C8(76, 4), C8(77, 4),
C8(78, 4), C8(79, 4), C8(80, 4), C8(81, 4), C8(82, 4), C8(83, 4),
C8(84, 4), C8(85, 4), C8(86, 4), C8(87, 4), C8(88, 4), C8(89, 4),
C8(90, 4), C8(91, 4), C8(92, 4), C8(93, 4), C8(94, 4), C8(95, 4),
C8(96, 4), C8(97, 4), C8(98, 4), C8(99, 4), C8(100, 4), C8(101, 4),
C8(102, 4), C8(103, 4), C8(104, 4), C8(105, 4), C8(106, 4), C8(107, 4),
C8(108, 4), C8(109, 4), C8(110, 4), C8(111, 4), C8(112, 4), C8(113, 4),
C8(114, 4), C8(115, 4), C8(116, 4), C8(117, 4), C8(118, 4), C8(119, 4),
C8(120, 4), C8(121, 4), C8(122, 4), C8(123, 4), C8(124, 4), C8(125, 4),
C8(126, 4), C8(127, 4), C8(128, 4), C8(129, 4), C8(130, 4), C8(131, 4),
C8(132, 4), C8(133, 4), C8(134, 4), C8(135, 4), C8(136, 4), C8(137, 4),
C8(138, 4), C8(139, 4), C8(140, 4), C8(141, 4), C8(142, 4), C8(143, 4),
C8(144, 4), C8(145, 4), C8(146, 4), C8(147, 4), C8(148, 4), C8(149, 4),
C8(150, 4), C8(151, 4), C8(152, 4), C8(153, 4), C8(154, 4), C8(155, 4),
C8(156, 4), C8(157, 4), C8(158, 4), C8(159, 4), C8(160, 4), C8(161, 4),
C8(162, 4), C8(163, 4), C8(164, 4), C8(165, 4), C8(166, 4), C8(167, 4),
C8(168, 4), C8(169, 4), C8(170, 4), C8(171, 4), C8(172, 4), C8(173, 4),
C8(174, 4), C8(175, 4), C8(176, 4), C8(177, 4), C8(178, 4), C8(179, 4),
C8(180, 4), C8(181, 4), C8(182, 4), C8(183, 4), C8(184, 4), C8(185, 4),
C8(186, 4), C8(187, 4), C8(188, 4), C8(189, 4), C8(190, 4), C8(191, 4),
C8(192, 4), C8(193, 4), C8(194, 4), C8(195, 4), C8(196, 4), C8(197, 4),
C8(198, 4), C8(199, 4), C8(200, 4), C8(201, 4), C8(202, 4), C8(203, 4),
C8(204, 4), C8(205, 4), C8(206, 4), C8(207, 4), C8(208, 4), C8(209, 4),
C8(210, 4), C8(211, 4), C8(212, 4), C8(213, 4), C8(214, 4), C8(215, 4),
C8(216, 4), C8(217, 4), C8(218, 4), C8(219, 4), C8(220, 4), C8(221, 4),
C8(222, 4), C8(223, 4), C8(224, 4), C8(225, 4), C8(226, 4), C8(227, 4),
C8(228, 4), C8(229, 4), C8(230, 4), C8(231, 4), C8(232, 4), C8(233, 4),
C8(234, 4), C8(235, 4), C8(236, 4), C8(237, 4), C8(238, 4), C8(239, 4),
C8(240, 4), C8(241, 4), C8(242, 4), C8(243, 4), C8(244, 4), C8(245, 4),
C8(246, 4), C8(247, 4), C8(248, 4), C8(249, 4), C8(250, 4), C8(251, 4),
C8(252, 4), C8(253, 4), C8(254, 4), C8(255, 4),
};
static const FbBits fbStipple4Bits[16] = {
C4(0, 8), C4(1, 8), C4(2, 8), C4(3, 8), C4(4, 8), C4(5, 8),
C4(6, 8), C4(7, 8), C4(8, 8), C4(9, 8), C4(10, 8), C4(11, 8),
C4(12, 8), C4(13, 8), C4(14, 8), C4(15, 8),
};
static const FbBits fbStipple2Bits[4] = {
C2(0, 16), C2(1, 16), C2(2, 16), C2(3, 16),
};
static const FbBits fbStipple1Bits[2] = {
C1(0, 32), C1(1, 32),
};
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#ifdef __clang__
/* shift overflow is intentional */
#pragma clang diagnostic ignored "-Wshift-overflow"
#endif
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/*
* 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) { \
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bitsRight = (src < srcEnd ? READ(src++) : 0); \
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bits = (FbStipLeft (bitsLeft, leftShift) | \
FbStipRight(bitsRight, rightShift)); \
bitsLeft = bitsRight; \
} else \
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bits = (src < srcEnd ? READ(src++) : 0); \
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}
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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)
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{
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 */
int startbyte, endbyte;
if (dstBpp == 24) {
fbBltOne24(src, srcStride, srcX,
dst, dstStride, dstX, dstBpp,
width, height, fgand, fgxor, bgand, bgxor);
return;
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}
/*
* 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
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*/
unitsPerSrc = FB_STIP_UNIT / pixelsPerDst;
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copy = FALSE;
transparent = FALSE;
if (bgand == 0 && fgand == 0)
copy = TRUE;
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else if (bgand == FB_ALLONES && bgxor == 0)
transparent = TRUE;
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/*
* 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);
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/*
* 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;
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}
else {
rightShift = dstS - srcX;
leftShift = FB_STIP_UNIT - rightShift;
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}
/*
* Get pointer to stipple mask array for this depth
*/
fbBits = 0; /* unused */
switch (pixelsPerDst) {
case 8:
fbBits = fbStipple8Bits;
break;
case 4:
fbBits = fbStipple4Bits;
break;
case 2:
fbBits = fbStipple2Bits;
break;
case 1:
fbBits = fbStipple1Bits;
break;
default:
return;
}
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/*
* Compute total number of destination words written, but
* don't count endmask
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*/
nDst = nmiddle;
if (startmask)
nDst++;
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dstStride -= nDst;
/*
* Compute total number of source words consumed
*/
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srcinc = (nDst + unitsPerSrc - 1) / unitsPerSrc;
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if (srcX > dstS)
srcinc++;
if (endmask) {
endNeedsLoad = nDst % unitsPerSrc == 0;
if (endNeedsLoad)
srcinc++;
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}
srcStride -= srcinc;
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/*
* 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) {
mask = fbBits[FbLeftStipBits(bits, pixelsPerDst)];
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--) {
mask = fbBits[FbLeftStipBits(bits, pixelsPerDst)];
WRITE(dst, FbOpaqueStipple(mask, fgxor, bgxor));
dst++;
bits = FbStipLeft(bits, pixelsPerDst);
}
}
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;
}
mask = fbBits[FbLeftStipBits(bits, pixelsPerDst)];
if (mask || !transparent)
FbDoRightMaskByteStippleRRop(dst, mask, fgand, fgxor,
bgand, bgxor, endbyte, endmask);
}
dst += dstStride;
src += srcStride;
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}
}
/*
* 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 ? \
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0xffffffU >> Mask24Neg (x,r) : \
0xffffffU << Mask24Check(x,r)) : 0)
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#define SelMask24(b,n,r) ((((b) >> n) & 1) * Mask24(n,r))
#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] = {
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/* rotate 0 */
{
C2_24(0, 0), C2_24(1, 0), C2_24(2, 0), C2_24(3, 0),
},
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/* rotate 8 */
{
C2_24(0, 8), C2_24(1, 8), C2_24(2, 8), C2_24(3, 8),
},
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/* rotate 16 */
{
C2_24(0, 16), C2_24(1, 16), C2_24(2, 16), C2_24(3, 16),
}
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};
#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); \
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bits = (src < srcEnd ? READ(src++) : 0); \
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__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) {\
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bits = FbStipLeft (READ(src++),offset); \
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remain = FB_STIP_UNIT - offset; \
fbFirstStipBits(len,stip); \
stip = FbMergeStip24Bits (0, stip, len); \
}
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#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)
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{
FbStip *src, *srcEnd;
FbBits leftMask, rightMask, mask;
int nlMiddle, nl;
FbStip stip, bits;
int remain;
int dstS;
int firstlen;
int rot0, rot;
int nDst;
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/*
* 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);
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dstS = (dstX + 23) / 24;
firstlen = FbStip24Len - dstS;
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nDst = nlMiddle;
if (leftMask)
nDst++;
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dstStride -= nDst;
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/* 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;
}
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}
/* 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;
}
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}
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;
}
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}
}
/*
* Not very efficient, but simple -- copy a single plane
* from an N bit image to a 1 bit image
*/
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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)
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{
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;
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if (!width)
return;
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src += srcX >> FB_SHIFT;
srcX &= FB_MASK;
dst += dstX >> FB_STIP_SHIFT;
dstX &= FB_STIP_MASK;
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w = width / srcBpp;
pm = fbReplicatePixel(planeMask, srcBpp);
if (srcBpp == 24) {
int tmpw = 24;
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rot0 = FbFirst24Rot(srcX);
if (srcX + tmpw > FB_UNIT)
tmpw = FB_UNIT - srcX;
srcMaskFirst = FbRot24(pm, rot0) & FbBitsMask(srcX, tmpw);
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}
else {
rot0 = 0;
srcMaskFirst = pm & FbBitsMask(srcX, srcBpp);
srcMask0 = pm & FbBitsMask(0, srcBpp);
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}
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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}
}