376 lines
9.9 KiB
C
376 lines
9.9 KiB
C
/******************************Module*Header*******************************\
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* Module Name: str.c
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*
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* Contains some 'C' inner-loop routines for our special-case StretchBlt.
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*
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* Copyright (c) 1993-1995 Microsoft Corporation
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\**************************************************************************/
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#include "precomp.h"
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/******************************Public*Routine******************************\
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*
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* Routine Name
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*
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* vDirectStretch8
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*
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* Routine Description:
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*
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* Stretch blt 8->8
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*
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* NOTE: This routine doesn't handle cases where the blt stretch starts
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* and ends in the same destination dword! vDirectStretchNarrow
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* is expected to have been called for that case.
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*
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* Arguments:
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*
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* pStrBlt - contains all params for blt
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*
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* Return Value:
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*
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* VOID
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*
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\**************************************************************************/
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VOID vDirectStretch8(
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STR_BLT* pStrBlt)
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{
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BYTE* pjSrc;
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BYTE* pjDstEnd;
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LONG WidthXAln;
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ULONG ulDst;
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ULONG xAccum;
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ULONG xTmp;
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ULONG yTmp;
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BYTE* pjOldScan;
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BYTE* pjBase;
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LONG cyDuplicate;
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PDEV* ppdev = pStrBlt->ppdev;
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LONG xDst = pStrBlt->XDstStart;
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LONG xSrc = pStrBlt->XSrcStart;
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BYTE* pjSrcScan = pStrBlt->pjSrcScan + xSrc;
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BYTE* pjDst = pStrBlt->pjDstScan + xDst;
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LONG yDst = pStrBlt->YDstStart;// + ppdev->yOffset;
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LONG yCount = pStrBlt->YDstCount;
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ULONG StartAln = (ULONG)((ULONG_PTR)pjDst & 0x03);
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LONG WidthX = pStrBlt->XDstEnd - xDst;
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ULONG EndAln = (ULONG)((ULONG_PTR)(pjDst + WidthX) & 0x03);
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ULONG xInt = pStrBlt->ulXDstToSrcIntCeil;
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ULONG xFrac = pStrBlt->ulXDstToSrcFracCeil;
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ULONG yAccum = pStrBlt->ulYFracAccumulator;
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ULONG yFrac = pStrBlt->ulYDstToSrcFracCeil;
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ULONG yInt = 0;
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LONG lDstStride = pStrBlt->lDeltaDst - WidthX;
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pjBase = ppdev->pjBase;
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WidthXAln = WidthX - EndAln - ((- (LONG) StartAln) & 0x03);
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//
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// if this is a shrinking blt, calc src scan line stride
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//
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if (pStrBlt->ulYDstToSrcIntCeil != 0)
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{
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yInt = pStrBlt->lDeltaSrc * pStrBlt->ulYDstToSrcIntCeil;
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}
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//
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// loop drawing each scan line
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//
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//
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// at least 7 wide (DST) blt
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//
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do {
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BYTE jSrc0,jSrc1,jSrc2,jSrc3;
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ULONG yTmp;
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pjSrc = pjSrcScan;
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xAccum = pStrBlt->ulXFracAccumulator;
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//
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// a single src scan line is being written
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//
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switch (StartAln) {
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case 1:
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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*pjDst++ = jSrc0;
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xAccum = xTmp;
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case 2:
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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*pjDst++ = jSrc0;
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xAccum = xTmp;
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case 3:
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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*pjDst++ = jSrc0;
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xAccum = xTmp;
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}
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pjDstEnd = pjDst + WidthXAln;
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while (pjDst != pjDstEnd)
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{
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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jSrc1 = *pjSrc;
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xAccum = xTmp + xFrac;
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pjSrc = pjSrc + xInt + (xAccum < xTmp);
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jSrc2 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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jSrc3 = *pjSrc;
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xAccum = xTmp + xFrac;
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pjSrc = pjSrc + xInt + (xAccum < xTmp);
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ulDst = (jSrc3 << 24) | (jSrc2 << 16) | (jSrc1 << 8) | jSrc0;
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*(PULONG)pjDst = ulDst;
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pjDst += 4;
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}
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switch (EndAln) {
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case 3:
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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*pjDst++ = jSrc0;
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xAccum = xTmp;
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case 2:
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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*pjDst++ = jSrc0;
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xAccum = xTmp;
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case 1:
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jSrc0 = *pjSrc;
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xTmp = xAccum + xFrac;
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pjSrc = pjSrc + xInt + (xTmp < xAccum);
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*pjDst++ = jSrc0;
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}
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pjOldScan = pjSrcScan;
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pjSrcScan += yInt;
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yTmp = yAccum + yFrac;
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if (yTmp < yAccum)
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{
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pjSrcScan += pStrBlt->lDeltaSrc;
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}
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yAccum = yTmp;
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pjDst = (pjDst + lDstStride);
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yDst++;
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yCount--;
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if ((yCount != 0) && (pjSrcScan == pjOldScan))
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{
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// It's an expanding stretch in 'y'; the scan we just laid down
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// will be copied at least once using the hardware:
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cyDuplicate = 0;
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do {
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cyDuplicate++;
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pjSrcScan += yInt;
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yTmp = yAccum + yFrac;
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if (yTmp < yAccum)
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{
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pjSrcScan += pStrBlt->lDeltaSrc;
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}
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yAccum = yTmp;
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pjDst = (pjDst + pStrBlt->lDeltaDst);
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yCount--;
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} while ((yCount != 0) && (pjSrcScan == pjOldScan));
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// The scan is to be copied 'cyDuplicate' times using the
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// hardware.
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do {
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CP_Y0(ppdev, pjBase, yDst - 1);
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CP_Y1(ppdev, pjBase, yDst - 1);
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CP_Y2(ppdev, pjBase, yDst);
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CP_Y3(ppdev, pjBase, yDst);
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yDst++;
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CP_START_BLT_WAIT(ppdev, pjBase);
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} while (--cyDuplicate != 0);
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}
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} while (yCount != 0);
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}
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/******************************Public*Routine******************************\
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*
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* Routine Name
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*
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* vDirectStretch16
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*
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* Routine Description:
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*
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* Stretch blt 16->16
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*
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* Arguments:
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*
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* pStrBlt - contains all params for blt
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*
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* Return Value:
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*
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* VOID
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*
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\**************************************************************************/
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VOID vDirectStretch16(
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STR_BLT* pStrBlt)
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{
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BYTE* pjOldScan;
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USHORT* pusSrc;
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USHORT* pusDstEnd;
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LONG WidthXAln;
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ULONG ulDst;
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ULONG xAccum;
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ULONG xTmp;
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ULONG yTmp;
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LONG cyDuplicate;
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BYTE* pjBase;
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PDEV* ppdev = pStrBlt->ppdev;
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LONG xDst = pStrBlt->XDstStart;
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LONG xSrc = pStrBlt->XSrcStart;
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BYTE* pjSrcScan = (pStrBlt->pjSrcScan) + xSrc * 2;
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USHORT* pusDst = (USHORT*)(pStrBlt->pjDstScan) + xDst;
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LONG yDst = pStrBlt->YDstStart;// + ppdev->yOffset;
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LONG yCount = pStrBlt->YDstCount;
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ULONG StartAln = (ULONG)(((ULONG_PTR)pusDst & 0x02) >> 1);
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LONG WidthX = pStrBlt->XDstEnd - xDst;
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ULONG EndAln = (ULONG)(((ULONG_PTR)(pusDst + WidthX) & 0x02) >> 1);
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ULONG xInt = pStrBlt->ulXDstToSrcIntCeil;
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ULONG xFrac = pStrBlt->ulXDstToSrcFracCeil;
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ULONG yAccum = pStrBlt->ulYFracAccumulator;
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ULONG yFrac = pStrBlt->ulYDstToSrcFracCeil;
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LONG lDstStride = pStrBlt->lDeltaDst - 2 * WidthX;
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ULONG yInt = 0;
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pjBase = ppdev->pjBase;
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WidthXAln = WidthX - EndAln - StartAln;
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//
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// if this is a shrinking blt, calc src scan line stride
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//
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if (pStrBlt->ulYDstToSrcIntCeil != 0)
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{
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yInt = pStrBlt->lDeltaSrc * pStrBlt->ulYDstToSrcIntCeil;
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}
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// Loop stretching each scan line
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do {
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USHORT usSrc0,usSrc1;
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ULONG yTmp;
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pusSrc = (USHORT*) pjSrcScan;
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xAccum = pStrBlt->ulXFracAccumulator;
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// A single source scan line is being written:
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if (StartAln)
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{
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usSrc0 = *pusSrc;
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xTmp = xAccum + xFrac;
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pusSrc = pusSrc + xInt + (xTmp < xAccum);
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*pusDst++ = usSrc0;
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xAccum = xTmp;
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}
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pusDstEnd = pusDst + WidthXAln;
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while (pusDst != pusDstEnd)
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{
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usSrc0 = *pusSrc;
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xTmp = xAccum + xFrac;
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pusSrc = pusSrc + xInt + (xTmp < xAccum);
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usSrc1 = *pusSrc;
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xAccum = xTmp + xFrac;
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pusSrc = pusSrc + xInt + (xAccum < xTmp);
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ulDst = (ULONG)((usSrc1 << 16) | usSrc0);
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*(ULONG*)pusDst = ulDst;
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pusDst+=2;
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}
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if (EndAln)
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{
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usSrc0 = *pusSrc;
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xTmp = xAccum + xFrac;
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pusSrc = pusSrc + xInt + (xTmp < xAccum);
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*pusDst++ = usSrc0;
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}
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pjOldScan = pjSrcScan;
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pjSrcScan += yInt;
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yTmp = yAccum + yFrac;
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if (yTmp < yAccum)
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{
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pjSrcScan += pStrBlt->lDeltaSrc;
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}
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yAccum = yTmp;
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pusDst = (USHORT*) ((BYTE*) pusDst + lDstStride);
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yDst++;
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yCount--;
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if ((yCount != 0) && (pjSrcScan == pjOldScan))
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{
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// It's an expanding stretch in 'y'; the scan we just laid down
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// will be copied at least once using the hardware:
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cyDuplicate = 0;
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do {
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cyDuplicate++;
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pjSrcScan += yInt;
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yTmp = yAccum + yFrac;
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if (yTmp < yAccum)
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{
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pjSrcScan += pStrBlt->lDeltaSrc;
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}
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yAccum = yTmp;
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pusDst = (USHORT*) ((BYTE*) pusDst + pStrBlt->lDeltaDst);
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yCount--;
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} while ((yCount != 0) && (pjSrcScan == pjOldScan));
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// The scan is to be copied 'cyDuplicate' times using the
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// hardware.
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do {
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CP_Y0(ppdev, pjBase, yDst - 1);
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CP_Y1(ppdev, pjBase, yDst - 1);
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CP_Y2(ppdev, pjBase, yDst);
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CP_Y3(ppdev, pjBase, yDst);
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yDst++;
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CP_START_BLT_WAIT(ppdev, pjBase);
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} while (--cyDuplicate != 0);
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}
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} while (yCount != 0);
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}
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