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/*
* Id: fbtile.c,v 1.1 1999/11/02 03:54:45 keithp Exp $
*
* 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.
*/
/* $XFree86: xc/programs/Xserver/fb/fbtile.c,v 1.3 2000/02/12 03:39:43 dawes Exp $ */
#include "fb.h"
/*
* Accelerated tile fill -- tile width is a power of two not greater
* than FB_UNIT
*/
void
fbEvenTile (FbBits *dst,
FbStride dstStride,
int dstX,
int width,
int height,
FbBits *tile,
int tileHeight,
int alu,
FbBits pm,
int xRot,
int yRot)
{
FbBits *t, *tileEnd, bits;
FbBits startmask, endmask;
FbBits and, xor;
int n, nmiddle;
int tileX, tileY;
int rot;
int startbyte, endbyte;
dst += dstX >> FB_SHIFT;
dstX &= FB_MASK;
FbMaskBitsBytes(dstX, width, FbDestInvarientRop(alu, pm),
startmask, startbyte, nmiddle, endmask, endbyte);
if (startmask)
dstStride--;
dstStride -= nmiddle;
/*
* Compute tile start scanline and rotation parameters
*/
tileEnd = tile + tileHeight;
modulus (- yRot, tileHeight, tileY);
t = tile + tileY;
modulus (- xRot, FB_UNIT, tileX);
rot = tileX;
while (height--)
{
/*
* Pick up bits for this scanline
*/
bits = *t++;
if (t == tileEnd) t = tile;
bits = FbRotLeft(bits,rot);
and = fbAnd(alu,bits,pm);
xor = fbXor(alu,bits,pm);
if (startmask)
{
FbDoLeftMaskByteRRop(dst, startbyte, startmask, and, xor);
dst++;
}
n = nmiddle;
if (!and)
while (n--)
*dst++ = xor;
else
while (n--)
{
*dst = FbDoRRop (*dst, and, xor);
dst++;
}
if (endmask)
FbDoRightMaskByteRRop(dst, endbyte, endmask, and, xor);
dst += dstStride;
}
}
void
fbOddTile(FbBits *dst,
FbStride dstStride,
int dstX,
int width,
int height,
FbBits *tile,
FbStride tileStride,
int tileWidth,
int tileHeight,
int alu,
FbBits pm,
int bpp,
int xRot,
int yRot)
{
int tileX, tileY;
int widthTmp;
int h, w;
int x, y;
modulus (- yRot, tileHeight, tileY);
y = 0;
while (height)
{
h = tileHeight - tileY;
if (h > height)
h = height;
height -= h;
widthTmp = width;
x = dstX;
modulus (dstX - xRot, tileWidth, tileX);
while (widthTmp)
{
w = tileWidth - tileX;
if (w > widthTmp)
w = widthTmp;
widthTmp -= w;
fbBlt (tile + tileY * tileStride,
tileStride,
tileX,
dst + y * dstStride,
dstStride,
x,
w, h,
alu,
pm,
bpp,
FALSE,
FALSE);
x += w;
tileX = 0;
}
y += h;
tileY = 0;
}
}
void
fbTile (FbBits *dst,
FbStride dstStride,
int dstX,
int width,
int height,
FbBits *tile,
FbStride tileStride,
int tileWidth,
int tileHeight,
int alu,
FbBits pm,
int bpp,
int xRot,
int yRot)
{
if (FbEvenTile (tileWidth))
fbEvenTile (dst, dstStride, dstX, width, height,
tile, tileHeight,
alu, pm, xRot, yRot);
else
fbOddTile (dst, dstStride, dstX, width, height,
tile, tileStride, tileWidth, tileHeight,
alu, pm, bpp, xRot, yRot);
}
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