546 lines
14 KiB
C
546 lines
14 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: Strips.c
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*
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* These are the line rendering routines of last resort, and are called
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* by 'bLines' when a line is clipped or otherwise cannot be drawn
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* directly by the hardware.
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*
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* We take advantage of the MGA's point-to-point vector drawing capability
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* to draw the strips. The MGA can automatically exclude the last pixel,
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* which makes our routines a little simpler.
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*
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* Copyright (c) 1992-1996 Microsoft Corporation
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* Copyright (c) 1993-1996 Matrox Electronic Systems, Ltd.
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\**************************************************************************/
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#include "precomp.h"
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/******************************Public*Routine******************************\
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* VOID vStripSolidHorizontal
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*
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* Draws left-to-right x-major near-horizontal lines using radial lines.
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*
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\**************************************************************************/
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VOID vStripSolidHorizontal(
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PDEV* ppdev,
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STRIP* pStrip,
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LINESTATE* pLineState)
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{
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BYTE* pjBase;
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LONG x;
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LONG y;
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LONG yDir;
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LONG* pStrips;
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LONG cStrips;
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LONG i;
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pjBase = ppdev->pjBase;
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x = pStrip->ptlStart.x + ppdev->xOffset;
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y = pStrip->ptlStart.y + ppdev->yOffset;
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yDir = (pStrip->flFlips & FL_FLIP_V) ? -1 : 1;
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pStrips = pStrip->alStrips;
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cStrips = pStrip->cStrips;
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for (i = cStrips; i != 0; i--)
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{
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CHECK_FIFO_SPACE(pjBase, 2);
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CP_WRITE(pjBase, DWG_XYSTRT, PACKXY(x, y));
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x += *pStrips++;
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CP_START(pjBase, DWG_XYEND, PACKXY(x, y));
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y += yDir;
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}
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pStrip->ptlStart.x = x - ppdev->xOffset;
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pStrip->ptlStart.y = y - ppdev->yOffset;
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}
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/******************************Public*Routine******************************\
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* VOID vStripSolidVertical
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*
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* Draws left-to-right y-major near-vertical lines using radial lines.
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*
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\**************************************************************************/
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VOID vStripSolidVertical(
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PDEV* ppdev,
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STRIP* pStrip,
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LINESTATE* pLineState)
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{
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BYTE* pjBase;
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LONG x;
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LONG y;
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LONG yDir;
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LONG* pStrips;
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LONG cStrips;
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LONG i;
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pjBase = ppdev->pjBase;
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x = pStrip->ptlStart.x + ppdev->xOffset;
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y = pStrip->ptlStart.y + ppdev->yOffset;
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yDir = (pStrip->flFlips & FL_FLIP_V) ? -1 : 1;
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pStrips = pStrip->alStrips;
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cStrips = pStrip->cStrips;
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for (i = cStrips; i != 0; i--)
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{
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CHECK_FIFO_SPACE(pjBase, 2);
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CP_WRITE(pjBase, DWG_XYSTRT, PACKXY(x, y));
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y += (yDir > 0) ? *pStrips : -*pStrips;
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pStrips++;
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CP_START(pjBase, DWG_XYEND, PACKXY(x, y));
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x++;
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}
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pStrip->ptlStart.x = x - ppdev->xOffset;
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pStrip->ptlStart.y = y - ppdev->yOffset;
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}
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/******************************Public*Routine******************************\
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* VOID vStripSolidDiagonalHorizontal
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*
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* Draws left-to-right x-major near-diagonal lines using radial lines.
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*
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\**************************************************************************/
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VOID vStripSolidDiagonalHorizontal(
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PDEV* ppdev,
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STRIP* pStrip,
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LINESTATE* pLineState)
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{
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BYTE* pjBase;
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LONG x;
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LONG y;
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LONG yDir;
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LONG* pStrips;
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LONG cStrips;
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LONG i;
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pjBase = ppdev->pjBase;
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x = pStrip->ptlStart.x + ppdev->xOffset;
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y = pStrip->ptlStart.y + ppdev->yOffset;
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yDir = (pStrip->flFlips & FL_FLIP_V) ? -1 : 1;
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pStrips = pStrip->alStrips;
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cStrips = pStrip->cStrips;
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for (i = cStrips; i != 0; i--)
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{
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CHECK_FIFO_SPACE(pjBase, 2);
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CP_WRITE(pjBase, DWG_XYSTRT, PACKXY(x, y));
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x += *pStrips;
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y += (yDir > 0) ? *pStrips : -*pStrips;
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pStrips++;
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CP_START(pjBase, DWG_XYEND, PACKXY(x, y));
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y -= yDir;
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}
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pStrip->ptlStart.x = x - ppdev->xOffset;
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pStrip->ptlStart.y = y - ppdev->yOffset;
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}
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/******************************Public*Routine******************************\
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* VOID vStripSolidDiagonalVertical
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*
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* Draws left-to-right y-major near-diagonal lines using radial lines.
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*
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\**************************************************************************/
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VOID vStripSolidDiagonalVertical(
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PDEV* ppdev,
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STRIP* pStrip,
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LINESTATE* pLineState)
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{
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BYTE* pjBase;
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LONG x;
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LONG y;
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LONG yDir;
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LONG* pStrips;
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LONG cStrips;
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LONG i;
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pjBase = ppdev->pjBase;
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x = pStrip->ptlStart.x + ppdev->xOffset;
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y = pStrip->ptlStart.y + ppdev->yOffset;
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yDir = (pStrip->flFlips & FL_FLIP_V) ? -1 : 1;
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pStrips = pStrip->alStrips;
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cStrips = pStrip->cStrips;
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for (i = cStrips; i != 0; i--)
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{
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CHECK_FIFO_SPACE(pjBase, 2);
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CP_WRITE(pjBase, DWG_XYSTRT, PACKXY(x, y));
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x += *pStrips;
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y += (yDir > 0) ? *pStrips : -*pStrips;
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pStrips++;
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CP_START(pjBase, DWG_XYEND, PACKXY(x, y));
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x--;
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}
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pStrip->ptlStart.x = x - ppdev->xOffset;
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pStrip->ptlStart.y = y - ppdev->yOffset;
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}
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/******************************Public*Routine******************************\
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* VOID vStripStyledHorizontal
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*
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* Takes the list of strips that define the pixels that would be lit for
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* a solid line, and breaks them into styling chunks according to the
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* styling information that is passed in.
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*
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* This particular routine handles x-major lines that run left-to-right,
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* and are comprised of horizontal strips. It draws the dashes using
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* short-stroke vectors.
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*
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* The performance of this routine could be improved significantly if
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* anyone cared enough about styled lines improve it.
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*
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\**************************************************************************/
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VOID vStripStyledHorizontal(
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PDEV* ppdev,
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STRIP* pstrip,
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LINESTATE* pls)
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{
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BYTE* pjBase;
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LONG x;
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LONG y;
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LONG dy;
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LONG* plStrip;
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LONG cStrips;
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LONG cStyle;
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LONG cStrip;
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LONG cThis;
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ULONG bIsGap;
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pjBase = ppdev->pjBase;
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if (pstrip->flFlips & FL_FLIP_V)
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{
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// The minor direction of the line is 90 degrees, and the major
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// direction is 0 (it's a left-to-right x-major line going up):
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dy = -1;
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}
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else
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{
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// The minor direction of the line is 270 degrees, and the major
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// direction is 0 (it's a left-to-right x-major line going down):
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dy = 1;
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}
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cStrips = pstrip->cStrips; // Total number of strips we'll do
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plStrip = pstrip->alStrips; // Points to current strip
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x = pstrip->ptlStart.x + ppdev->xOffset;
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// x position of start of first strip
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y = pstrip->ptlStart.y + ppdev->yOffset;
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// y position of start of first strip
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cStrip = *plStrip; // Number of pels in first strip
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cStyle = pls->spRemaining; // Number of pels in first 'gap' or 'dash'
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bIsGap = pls->ulStyleMask; // Tells whether in a 'gap' or a 'dash'
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// ulStyleMask is non-zero if we're in the middle of a 'gap',
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// and zero if we're in the middle of a 'dash':
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if (bIsGap)
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goto SkipAGap;
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else
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goto OutputADash;
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PrepareToSkipAGap:
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// Advance in the style-state array, so that we can find the next
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// 'dot' that we'll have to display:
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bIsGap = ~bIsGap;
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pls->psp++;
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if (pls->psp > pls->pspEnd)
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pls->psp = pls->pspStart;
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cStyle = *pls->psp;
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// If 'cStrip' is zero, we also need a new strip:
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if (cStrip != 0)
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goto SkipAGap;
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// Here, we're in the middle of a 'gap' where we don't have to
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// display anything. We simply cycle through all the strips
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// we can, keeping track of the current position, until we run
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// out of 'gap':
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while (TRUE)
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{
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// Each time we loop, we move to a new scan and need a new strip:
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y += dy;
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plStrip++;
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cStrips--;
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if (cStrips == 0)
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goto AllDone;
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cStrip = *plStrip;
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SkipAGap:
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cThis = min(cStrip, cStyle);
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cStyle -= cThis;
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cStrip -= cThis;
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x += cThis;
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if (cStyle == 0)
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goto PrepareToOutputADash;
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}
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PrepareToOutputADash:
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// Advance in the style-state array, so that we can find the next
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// 'dot' that we'll have to display:
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bIsGap = ~bIsGap;
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pls->psp++;
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if (pls->psp > pls->pspEnd)
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pls->psp = pls->pspStart;
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cStyle = *pls->psp;
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// If 'cStrip' is zero, we also need a new strip.
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if (cStrip != 0)
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{
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// There's more to be done in the current strip:
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goto OutputADash;
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}
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// We've finished with the current strip:
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while (TRUE)
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{
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// Each time we loop, we move to a new scan and need a new strip:
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y += dy;
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plStrip++;
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cStrips--;
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if (cStrips == 0)
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goto AllDone;
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cStrip = *plStrip;
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OutputADash:
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cThis = min(cStrip, cStyle);
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cStyle -= cThis;
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cStrip -= cThis;
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CHECK_FIFO_SPACE(pjBase, 2);
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CP_WRITE(pjBase, DWG_XYSTRT, PACKXY(x, y));
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x += cThis;
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CP_START(pjBase, DWG_XYEND, PACKXY(x, y));
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if (cStyle == 0)
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goto PrepareToSkipAGap;
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}
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AllDone:
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// Update our state variables so that the next line can continue
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// where we left off:
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pls->spRemaining = cStyle;
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pls->ulStyleMask = bIsGap;
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pstrip->ptlStart.x = x - ppdev->xOffset;
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pstrip->ptlStart.y = y - ppdev->yOffset;
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}
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/******************************Public*Routine******************************\
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* VOID vStripStyledVertical
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*
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* Takes the list of strips that define the pixels that would be lit for
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* a solid line, and breaks them into styling chunks according to the
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* styling information that is passed in.
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*
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* This particular routine handles y-major lines that run left-to-right,
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* and are comprised of vertical strips. It draws the dashes using
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* short-stroke vectors.
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*
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* The performance of this routine could be improved significantly if
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* anyone cared enough about styled lines improve it.
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*
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\**************************************************************************/
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VOID vStripStyledVertical(
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PDEV* ppdev,
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STRIP* pstrip,
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LINESTATE* pls)
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{
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BYTE* pjBase;
|
||
|
|
LONG x;
|
||
|
|
LONG y;
|
||
|
|
LONG dy;
|
||
|
|
LONG* plStrip;
|
||
|
|
LONG cStrips;
|
||
|
|
LONG cStyle;
|
||
|
|
LONG cStrip;
|
||
|
|
LONG cThis;
|
||
|
|
ULONG bIsGap;
|
||
|
|
|
||
|
|
pjBase = ppdev->pjBase;
|
||
|
|
|
||
|
|
if (pstrip->flFlips & FL_FLIP_V)
|
||
|
|
{
|
||
|
|
// The minor direction of the line is 0 degrees, and the major
|
||
|
|
// direction is 90 (it's a left-to-right y-major line going up):
|
||
|
|
|
||
|
|
dy = -1;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// The minor direction of the line is 0 degrees, and the major
|
||
|
|
// direction is 270 (it's a left-to-right y-major line going down):
|
||
|
|
|
||
|
|
dy = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
cStrips = pstrip->cStrips; // Total number of strips we'll do
|
||
|
|
plStrip = pstrip->alStrips; // Points to current strip
|
||
|
|
x = pstrip->ptlStart.x + ppdev->xOffset;
|
||
|
|
// x position of start of first strip
|
||
|
|
y = pstrip->ptlStart.y + ppdev->yOffset;
|
||
|
|
// y position of start of first strip
|
||
|
|
|
||
|
|
cStrip = *plStrip; // Number of pels in first strip
|
||
|
|
|
||
|
|
cStyle = pls->spRemaining; // Number of pels in first 'gap' or 'dash'
|
||
|
|
bIsGap = pls->ulStyleMask; // Tells whether in a 'gap' or a 'dash'
|
||
|
|
|
||
|
|
// ulStyleMask is non-zero if we're in the middle of a 'gap',
|
||
|
|
// and zero if we're in the middle of a 'dash':
|
||
|
|
|
||
|
|
if (bIsGap)
|
||
|
|
goto SkipAGap;
|
||
|
|
else
|
||
|
|
goto OutputADash;
|
||
|
|
|
||
|
|
PrepareToSkipAGap:
|
||
|
|
|
||
|
|
// Advance in the style-state array, so that we can find the next
|
||
|
|
// 'dot' that we'll have to display:
|
||
|
|
|
||
|
|
bIsGap = ~bIsGap;
|
||
|
|
pls->psp++;
|
||
|
|
if (pls->psp > pls->pspEnd)
|
||
|
|
pls->psp = pls->pspStart;
|
||
|
|
|
||
|
|
cStyle = *pls->psp;
|
||
|
|
|
||
|
|
// If 'cStrip' is zero, we also need a new strip:
|
||
|
|
|
||
|
|
if (cStrip != 0)
|
||
|
|
goto SkipAGap;
|
||
|
|
|
||
|
|
// Here, we're in the middle of a 'gap' where we don't have to
|
||
|
|
// display anything. We simply cycle through all the strips
|
||
|
|
// we can, keeping track of the current position, until we run
|
||
|
|
// out of 'gap':
|
||
|
|
|
||
|
|
while (TRUE)
|
||
|
|
{
|
||
|
|
// Each time we loop, we move to a new column and need a new strip:
|
||
|
|
|
||
|
|
x++;
|
||
|
|
|
||
|
|
plStrip++;
|
||
|
|
cStrips--;
|
||
|
|
if (cStrips == 0)
|
||
|
|
goto AllDone;
|
||
|
|
|
||
|
|
cStrip = *plStrip;
|
||
|
|
|
||
|
|
SkipAGap:
|
||
|
|
|
||
|
|
cThis = min(cStrip, cStyle);
|
||
|
|
cStyle -= cThis;
|
||
|
|
cStrip -= cThis;
|
||
|
|
|
||
|
|
y += (dy > 0) ? cThis : -cThis;
|
||
|
|
|
||
|
|
if (cStyle == 0)
|
||
|
|
goto PrepareToOutputADash;
|
||
|
|
}
|
||
|
|
|
||
|
|
PrepareToOutputADash:
|
||
|
|
|
||
|
|
// Advance in the style-state array, so that we can find the next
|
||
|
|
// 'dot' that we'll have to display:
|
||
|
|
|
||
|
|
bIsGap = ~bIsGap;
|
||
|
|
pls->psp++;
|
||
|
|
if (pls->psp > pls->pspEnd)
|
||
|
|
pls->psp = pls->pspStart;
|
||
|
|
|
||
|
|
cStyle = *pls->psp;
|
||
|
|
|
||
|
|
// If 'cStrip' is zero, we also need a new strip.
|
||
|
|
|
||
|
|
if (cStrip != 0)
|
||
|
|
{
|
||
|
|
// There's more to be done in the current strip:
|
||
|
|
|
||
|
|
goto OutputADash;
|
||
|
|
}
|
||
|
|
|
||
|
|
// We've finished with the current strip:
|
||
|
|
|
||
|
|
while (TRUE)
|
||
|
|
{
|
||
|
|
// Each time we loop, we move to a new column and need a new strip:
|
||
|
|
|
||
|
|
x++;
|
||
|
|
|
||
|
|
plStrip++;
|
||
|
|
cStrips--;
|
||
|
|
if (cStrips == 0)
|
||
|
|
goto AllDone;
|
||
|
|
|
||
|
|
cStrip = *plStrip;
|
||
|
|
|
||
|
|
OutputADash:
|
||
|
|
|
||
|
|
cThis = min(cStrip, cStyle);
|
||
|
|
cStyle -= cThis;
|
||
|
|
cStrip -= cThis;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 2);
|
||
|
|
CP_WRITE(pjBase, DWG_XYSTRT, PACKXY(x, y));
|
||
|
|
y += (dy > 0) ? cThis : -cThis;
|
||
|
|
CP_START(pjBase, DWG_XYEND, PACKXY(x, y));
|
||
|
|
|
||
|
|
if (cStyle == 0)
|
||
|
|
goto PrepareToSkipAGap;
|
||
|
|
}
|
||
|
|
|
||
|
|
AllDone:
|
||
|
|
|
||
|
|
// Update our state variables so that the next line can continue
|
||
|
|
// where we left off:
|
||
|
|
|
||
|
|
pls->spRemaining = cStyle;
|
||
|
|
pls->ulStyleMask = bIsGap;
|
||
|
|
pstrip->ptlStart.x = x - ppdev->xOffset;
|
||
|
|
pstrip->ptlStart.y = y - ppdev->yOffset;
|
||
|
|
}
|