/******************************Module*Header*******************************\
* Module Name: stretch.c
*
* Copyright (c) 1993-1995 Microsoft Corporation
\**************************************************************************/
#include "precomp.h"
#define STRETCH_MAX_EXTENT 32767
/******************************Public*Routine******************************\
*
* Routine Name
*
* vDirectStretch8
*
* Routine Description:
*
* Stretch blt 8->8
*
* NOTE: This routine doesn't handle cases where the blt stretch starts
* and ends in the same destination dword! vDirectStretchNarrow
* is expected to have been called for that case.
*
* Arguments:
*
* pStrBlt - contains all params for blt
*
* Return Value:
*
* VOID
*
\**************************************************************************/
VOID vDirectStretch8(
STR_BLT* pStrBlt)
{
BYTE* pjSrc;
BYTE* pjDstEnd;
LONG WidthXAln;
ULONG ulDst;
ULONG xAccum;
ULONG xTmp;
ULONG yTmp;
BYTE* pjOldScan;
LONG cyDuplicate;
PDEV* ppdev = pStrBlt->ppdev;
LONG xDst = pStrBlt->XDstStart;
LONG xSrc = pStrBlt->XSrcStart;
BYTE* pjSrcScan = pStrBlt->pjSrcScan + xSrc;
BYTE* pjDst = pStrBlt->pjDstScan + xDst;
LONG yDst = pStrBlt->YDstStart; // + ppdev->yOffset;
LONG yCount = pStrBlt->YDstCount;
ULONG StartAln = (ULONG)((ULONG_PTR)pjDst & 0x03);
LONG WidthX = pStrBlt->XDstEnd - xDst;
ULONG EndAln = (ULONG)((ULONG_PTR)(pjDst + WidthX) & 0x03);
ULONG xInt = pStrBlt->ulXDstToSrcIntCeil;
ULONG xFrac = pStrBlt->ulXDstToSrcFracCeil;
ULONG yAccum = pStrBlt->ulYFracAccumulator;
ULONG yFrac = pStrBlt->ulYDstToSrcFracCeil;
ULONG yInt = 0;
LONG lDstStride = pStrBlt->lDeltaDst - WidthX;
BYTE* pjBase = ppdev->pjBase;
LONG cBpp = 1;
LONG lDelta = ppdev->lDelta;
ULONG ulSrcAddr = yDst * lDelta + xDst * cBpp + ppdev->xyOffset;
WidthXAln = WidthX - EndAln - ((- (LONG) StartAln) & 0x03);
//
// if this is a shrinking blt, calc src scan line stride
//
if (pStrBlt->ulYDstToSrcIntCeil != 0)
{
yInt = pStrBlt->lDeltaSrc * pStrBlt->ulYDstToSrcIntCeil;
}
//
// loop drawing each scan line
//
//
// at least 7 wide (DST) blt
//
WAIT_FOR_EMPTY_ACL_QUEUE(ppdev, pjBase);
CP_XCNT(ppdev, pjBase, (WidthX * cBpp) - 1);
CP_YCNT(ppdev, pjBase, 0); // we'll do one line at a time
do {
BYTE jSrc0,jSrc1,jSrc2,jSrc3;
ULONG yTmp;
pjSrc = pjSrcScan;
xAccum = pStrBlt->ulXFracAccumulator;
//
// a single src scan line is being written
//
switch (StartAln) {
case 1:
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
*pjDst++ = jSrc0;
xAccum = xTmp;
case 2:
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
*pjDst++ = jSrc0;
xAccum = xTmp;
case 3:
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
*pjDst++ = jSrc0;
xAccum = xTmp;
}
pjDstEnd = pjDst + WidthXAln;
while (pjDst != pjDstEnd)
{
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
jSrc1 = *pjSrc;
xAccum = xTmp + xFrac;
pjSrc = pjSrc + xInt + (xAccum < xTmp);
jSrc2 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
jSrc3 = *pjSrc;
xAccum = xTmp + xFrac;
pjSrc = pjSrc + xInt + (xAccum < xTmp);
ulDst = (jSrc3 << 24) | (jSrc2 << 16) | (jSrc1 << 8) | jSrc0;
*(PULONG)pjDst = ulDst;
pjDst += 4;
}
switch (EndAln) {
case 3:
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
*pjDst++ = jSrc0;
xAccum = xTmp;
case 2:
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
*pjDst++ = jSrc0;
xAccum = xTmp;
case 1:
jSrc0 = *pjSrc;
xTmp = xAccum + xFrac;
pjSrc = pjSrc + xInt + (xTmp < xAccum);
*pjDst++ = jSrc0;
}
pjOldScan = pjSrcScan;
pjSrcScan += yInt;
yTmp = yAccum + yFrac;
if (yTmp < yAccum)
{
pjSrcScan += pStrBlt->lDeltaSrc;
}
yAccum = yTmp;
pjDst = (pjDst + lDstStride);
yCount--;
if ((yCount != 0) && (pjSrcScan == pjOldScan))
{
// It's an expanding stretch in 'y'; the scan we just laid down
// will be copied at least once using the hardware:
cyDuplicate = 0;
do {
cyDuplicate++;
pjSrcScan += yInt;
yTmp = yAccum + yFrac;
if (yTmp < yAccum)
{
pjSrcScan += pStrBlt->lDeltaSrc;
}
yAccum = yTmp;
pjDst = (pjDst + pStrBlt->lDeltaDst);
yCount--;
} while ((yCount != 0) && (pjSrcScan == pjOldScan));
WAIT_FOR_EMPTY_ACL_QUEUE(ppdev, pjBase);
CP_SRC_ADDR(ppdev, pjBase, ulSrcAddr);
while (cyDuplicate)
{
// Set the blt destination address as the base address of MMU aperture 2
// Then start the accelerated operation by writing something to this
// aperture.
//
// NOTE: The destination is the ulSrcAddr + lDetla. Additionally,
// ulSrcAddr must be incremented by lDelta for each time through
// this loop. So, instead of maintaining a ulDstAddr, we'll
// just piggy back off of ulSrcAddr.
ulSrcAddr += lDelta;
SET_DEST_ADDR_ABS(ppdev, ulSrcAddr);
START_ACL(ppdev);
if (--cyDuplicate)
{
//
// Only wait if we are going to loop again!
//
WAIT_FOR_EMPTY_ACL_QUEUE(ppdev, pjBase);
}
}
}
ulSrcAddr += lDelta;
} while (yCount != 0);
}
/******************************Public*Routine******************************\
*
* Routine Name
*
* vDirectStretch16
*
* Routine Description:
*
* Stretch blt 16->16
*
* Arguments:
*
* pStrBlt - contains all params for blt
*
* Return Value:
*
* VOID
*
\**************************************************************************/
VOID vDirectStretch16(
STR_BLT* pStrBlt)
{
BYTE* pjOldScan;
USHORT* pusSrc;
USHORT* pusDstEnd;
LONG WidthXAln;
ULONG ulDst;
ULONG xAccum;
ULONG xTmp;
ULONG yTmp;
LONG cyDuplicate;
PDEV* ppdev = pStrBlt->ppdev;
LONG xDst = pStrBlt->XDstStart;
LONG xSrc = pStrBlt->XSrcStart;
BYTE* pjSrcScan = (pStrBlt->pjSrcScan) + xSrc * 2;
USHORT* pusDst = (USHORT*)(pStrBlt->pjDstScan) + xDst;
LONG yDst = pStrBlt->YDstStart; // + ppdev->yOffset;
LONG yCount = pStrBlt->YDstCount;
ULONG StartAln = (ULONG)(((ULONG_PTR)pusDst & 0x02) >> 1);
LONG WidthX = pStrBlt->XDstEnd - xDst;
ULONG EndAln = (ULONG)(((ULONG_PTR)(pusDst + WidthX) & 0x02) >> 1);
ULONG xInt = pStrBlt->ulXDstToSrcIntCeil;
ULONG xFrac = pStrBlt->ulXDstToSrcFracCeil;
ULONG yAccum = pStrBlt->ulYFracAccumulator;
ULONG yFrac = pStrBlt->ulYDstToSrcFracCeil;
LONG lDstStride = pStrBlt->lDeltaDst - 2 * WidthX;
ULONG yInt = 0;
BYTE* pjBase = ppdev->pjBase;
LONG cBpp = 2;
LONG lDelta = ppdev->lDelta;
ULONG ulSrcAddr = yDst * lDelta + xDst * cBpp + ppdev->xyOffset;
WidthXAln = WidthX - EndAln - StartAln;
//
// if this is a shrinking blt, calc src scan line stride
//
if (pStrBlt->ulYDstToSrcIntCeil != 0)
{
yInt = pStrBlt->lDeltaSrc * pStrBlt->ulYDstToSrcIntCeil;
}
// Loop stretching each scan line
WAIT_FOR_EMPTY_ACL_QUEUE(ppdev, pjBase);
CP_XCNT(ppdev, pjBase, (WidthX * cBpp) - 1);
CP_YCNT(ppdev, pjBase, 0); // we'll do one line at a time
do {
USHORT usSrc0,usSrc1;
ULONG yTmp;
pusSrc = (USHORT*) pjSrcScan;
xAccum = pStrBlt->ulXFracAccumulator;
// A single source scan line is being written:
if (StartAln)
{
usSrc0 = *pusSrc;
xTmp = xAccum + xFrac;
pusSrc = pusSrc + xInt + (xTmp < xAccum);
*pusDst++ = usSrc0;
xAccum = xTmp;
}
pusDstEnd = pusDst + WidthXAln;
while (pusDst != pusDstEnd)
{
usSrc0 = *pusSrc;
xTmp = xAccum + xFrac;
pusSrc = pusSrc + xInt + (xTmp < xAccum);
usSrc1 = *pusSrc;
xAccum = xTmp + xFrac;
pusSrc = pusSrc + xInt + (xAccum < xTmp);
ulDst = (ULONG)((usSrc1 << 16) | usSrc0);
*(ULONG*)pusDst = ulDst;
pusDst+=2;
}
if (EndAln)
{
usSrc0 = *pusSrc;
xTmp = xAccum + xFrac;
pusSrc = pusSrc + xInt + (xTmp < xAccum);
*pusDst++ = usSrc0;
}
pjOldScan = pjSrcScan;
pjSrcScan += yInt;
yTmp = yAccum + yFrac;
if (yTmp < yAccum)
{
pjSrcScan += pStrBlt->lDeltaSrc;
}
yAccum = yTmp;
pusDst = (USHORT*) ((BYTE*) pusDst + lDstStride);
yCount--;
if ((yCount != 0) && (pjSrcScan == pjOldScan))
{
// It's an expanding stretch in 'y'; the scan we just laid down
// will be copied at least once using the hardware:
cyDuplicate = 0;
do {
cyDuplicate++;
pjSrcScan += yInt;
yTmp = yAccum + yFrac;
if (yTmp < yAccum)
{
pjSrcScan += pStrBlt->lDeltaSrc;
}
yAccum = yTmp;
pusDst = (USHORT*) ((BYTE*) pusDst + pStrBlt->lDeltaDst);
yCount--;
} while ((yCount != 0) && (pjSrcScan == pjOldScan));
WAIT_FOR_EMPTY_ACL_QUEUE(ppdev, pjBase);
CP_SRC_ADDR(ppdev, pjBase, ulSrcAddr);
while (cyDuplicate)
{
// Set the blt destination address as the base address of MMU aperture 2
// Then start the accelerated operation by writing something to this
// aperture.
//
// NOTE: The destination is the ulSrcAddr + lDetla. Additionally,
// ulSrcAddr must be incremented by lDelta for each time through
// this loop. So, instead of maintaining a ulDstAddr, we'll
// just piggy back off of ulSrcAddr.
ulSrcAddr += lDelta;
SET_DEST_ADDR_ABS(ppdev, ulSrcAddr);
START_ACL(ppdev);
if (--cyDuplicate)
{
//
// Only wait if we are going to loop again!
//
WAIT_FOR_EMPTY_ACL_QUEUE(ppdev, pjBase);
}
}
}
ulSrcAddr += lDelta;
} while (yCount != 0);
}