1312 lines
40 KiB
C
1312 lines
40 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: fastfill.c
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*
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* Draws fast convex rectangles.
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*
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* Copyright (c) 1993-1996 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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#define RIGHT 0
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#define LEFT 1
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typedef struct _TRAPEZOIDDATA TRAPEZOIDDATA; // Handy forward declaration
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typedef VOID (FNTRAPEZOID)(TRAPEZOIDDATA*, LONG, LONG);
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// Prototype for trapezoid
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// drawing routines
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typedef struct _EDGEDATA {
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LONG x; // Current x position
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LONG dx; // # pixels to advance x on each scan
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LONG lError; // Current DDA error
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LONG lErrorUp; // DDA error increment on each scan
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LONG dN; // Signed delta-y in fixed point form (also known
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// as the DDA error adjustment, and used to be
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// called 'lErrorDown')
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LONG dM; // Signed delta-x in fixed point form
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POINTFIX* pptfx; // Points to start of current edge
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LONG dptfx; // Delta (in bytes) from pptfx to next point
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LONG cy; // Number of scans to go for this edge
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LONG bNew; // Set to TRUE when a new DDA must be started
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// for the edge.
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} EDGEDATA; /* ed, ped */
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typedef struct _TRAPEZOIDDATA {
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FNTRAPEZOID* pfnTrap; // Pointer to appropriate trapezoid drawing routine,
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// or trapezoid clip routine
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FNTRAPEZOID* pfnTrapClip;// Pointer to appropriate trapezoid drawing routine
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// if doing clipping
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PDEV* ppdev; // Pointer to PDEV
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EDGEDATA aed[2]; // DDA information for both edges
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POINTL ptlBrush; // Brush alignment
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LONG yClipTop; // Top of clip rectangle
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LONG yClipBottom;// Bottom of clip rectangle
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// MGA specific stuff below here:
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ULONG ulMgaSgn; // Current sign register, MGA specific
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ULONG ulLinear; // Linear offset to brush in off-screen memory
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} TRAPEZOIDDATA; /* td, ptd */
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/******************************Public*Routine******************************\
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* VOID vClipTrapezoid
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*
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* Clips a trapezoid.
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*
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* NOTE: This routine assumes that the polygon's dimensions are small
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* enough that its QUOTIENT_REMAINDER calculations won't overflow.
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* This means that large polygons must never make it here.
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*
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\**************************************************************************/
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VOID vClipTrapezoid(
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TRAPEZOIDDATA* ptd,
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LONG yTrapTop,
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LONG cyTrapezoid)
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{
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LONG yTrapBottom;
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LONG dN;
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LONG lNum;
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LONG xDelta;
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LONG lError;
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yTrapBottom = yTrapTop + cyTrapezoid;
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if (yTrapTop < ptd->yClipTop)
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{
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if ((ptd->aed[LEFT].bNew) &&
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(yTrapBottom + ptd->aed[LEFT].cy > ptd->yClipTop))
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{
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dN = ptd->aed[LEFT].dN;
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lNum = ptd->aed[LEFT].dM * (ptd->yClipTop - yTrapTop)
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+ (ptd->aed[LEFT].lError + dN);
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if (lNum >= 0)
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{
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QUOTIENT_REMAINDER(lNum, dN, xDelta, lError);
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}
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else
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{
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lNum = -lNum;
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QUOTIENT_REMAINDER(lNum, dN, xDelta, lError);
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xDelta = -xDelta;
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if (lError != 0)
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{
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xDelta--;
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lError = dN - lError;
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}
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}
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ptd->aed[LEFT].x += xDelta;
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ptd->aed[LEFT].lError = lError - dN;
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}
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if ((ptd->aed[RIGHT].bNew) &&
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(yTrapBottom + ptd->aed[RIGHT].cy > ptd->yClipTop))
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{
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dN = ptd->aed[RIGHT].dN;
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lNum = ptd->aed[RIGHT].dM * (ptd->yClipTop - yTrapTop)
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+ (ptd->aed[RIGHT].lError + dN);
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if (lNum >= 0)
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{
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QUOTIENT_REMAINDER(lNum, dN, xDelta, lError);
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}
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else
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{
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lNum = -lNum;
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QUOTIENT_REMAINDER(lNum, dN, xDelta, lError);
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xDelta = -xDelta;
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if (lError != 0)
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{
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xDelta--;
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lError = dN - lError;
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}
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}
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ptd->aed[RIGHT].x += xDelta;
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ptd->aed[RIGHT].lError = lError - dN;
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}
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}
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// If this trapezoid vertically intersects our clip rectangle, draw it:
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if ((yTrapBottom > ptd->yClipTop) &&
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(yTrapTop < ptd->yClipBottom))
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{
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if (yTrapTop <= ptd->yClipTop)
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{
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yTrapTop = ptd->yClipTop;
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// Have to let trapezoid drawer know that it has to load
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// its DDAs for very first trapezoid drawn:
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ptd->aed[RIGHT].bNew = TRUE;
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ptd->aed[LEFT].bNew = TRUE;
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}
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if (yTrapBottom >= ptd->yClipBottom)
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{
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yTrapBottom = ptd->yClipBottom;
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}
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ptd->pfnTrapClip(ptd, yTrapTop, yTrapBottom - yTrapTop);
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}
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}
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/******************************Public*Routine******************************\
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* VOID vHardwareTrapezoid
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*
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* Uses the MGA's hardware trapezoid capability to draw solid or two-colour
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* pattern trapezoids.
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*
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\**************************************************************************/
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VOID vHardwareTrapezoid(
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TRAPEZOIDDATA* ptd,
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LONG yTrapezoid,
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LONG cyTrapezoid)
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{
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PDEV* ppdev;
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LONG dM;
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LONG lError;
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BYTE* pjBase;
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ppdev = ptd->ppdev;
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pjBase = ppdev->pjBase;
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if (ptd->aed[LEFT].bNew)
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{
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dM = ptd->aed[LEFT].dM;
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if (dM >= 0)
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{
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ptd->ulMgaSgn &= ~sdxl_SUB;
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lError = -dM - ptd->aed[LEFT].lError - 1;
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dM = -dM;
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}
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else
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{
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ptd->ulMgaSgn |= sdxl_SUB;
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lError = dM + ptd->aed[LEFT].dN + ptd->aed[LEFT].lError;
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}
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CHECK_FIFO_SPACE(pjBase, 6);
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CP_WRITE(pjBase, DWG_AR2, dM);
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CP_WRITE(pjBase, DWG_AR1, lError);
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CP_WRITE(pjBase, DWG_AR0, ptd->aed[LEFT].dN);
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CP_WRITE(pjBase, DWG_FXLEFT, ptd->aed[LEFT].x + ppdev->xOffset);
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}
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if (ptd->aed[RIGHT].bNew)
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{
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dM = ptd->aed[RIGHT].dM;
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if (dM >= 0)
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{
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ptd->ulMgaSgn &= ~sdxr_DEC;
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lError = -dM - ptd->aed[RIGHT].lError - 1;
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dM = -dM;
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}
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else
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{
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ptd->ulMgaSgn |= sdxr_DEC;
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lError = dM + ptd->aed[RIGHT].dN + ptd->aed[RIGHT].lError;
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}
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CHECK_FIFO_SPACE(pjBase, 6);
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CP_WRITE(pjBase, DWG_AR5, dM);
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CP_WRITE(pjBase, DWG_AR4, lError);
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CP_WRITE(pjBase, DWG_AR6, ptd->aed[RIGHT].dN);
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CP_WRITE(pjBase, DWG_FXRIGHT, ptd->aed[RIGHT].x + ppdev->xOffset);
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}
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CP_WRITE(pjBase, DWG_SGN, ptd->ulMgaSgn);
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CP_START(pjBase, DWG_LEN, cyTrapezoid);
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}
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/******************************Public*Routine******************************\
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* VOID vMilSoftwareTrapezoid
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*
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* Draws a trapezoid using a software DDA.
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*
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\**************************************************************************/
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VOID vMilSoftwareTrapezoid(
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TRAPEZOIDDATA* ptd,
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LONG yTrapezoid,
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LONG cyTrapezoid)
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{
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PDEV* ppdev;
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LONG xOffset;
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LONG xBrush;
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ULONG ulOffset;
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ULONG ulLinear;
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ULONG ulScan;
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CHAR cFifo;
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LONG lLeftError;
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LONG xLeft;
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LONG lRightError;
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LONG xRight;
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ULONG ulAr0Adj;
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BYTE* pjBase;
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ppdev = ptd->ppdev;
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pjBase = ppdev->pjBase;
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xBrush = ptd->ptlBrush.x;
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ulOffset = ((yTrapezoid - ptd->ptlBrush.y) & 7) << PATTERN_PITCH_SHIFT;
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ulLinear = ptd->ulLinear;
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// For cjPelSize = 1, 2, 3, or 4,
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// ulAr0Adj = 2, 4, 0, or 6.
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if (ppdev->cjPelSize == 3)
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{
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ulAr0Adj = 0;
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}
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else
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{
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ulAr0Adj = (ppdev->cjPelSize + 2) & 0xfffffffe;
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}
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xOffset = ppdev->xOffset;
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yTrapezoid += ppdev->yOffset;
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// If the left and right edges are vertical, simply output as
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// a rectangle.
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if (((ptd->aed[LEFT].lErrorUp | ptd->aed[RIGHT].lErrorUp) == 0) &&
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((ptd->aed[LEFT].dx | ptd->aed[RIGHT].dx) == 0))
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{
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xLeft = ptd->aed[LEFT].x + xOffset;
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xRight = ptd->aed[RIGHT].x + xOffset - 1; // Inclusive of edge
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if (xLeft <= xRight)
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{
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CHECK_FIFO_SPACE(pjBase, 4);
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ulScan = ulLinear + ulOffset + ((xLeft - xBrush) & 7);
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CP_WRITE(pjBase, DWG_AR3, ulScan);
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if (ulAr0Adj)
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{
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CP_WRITE(pjBase, DWG_AR0, ((ulScan & 0xfffffff8) |
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((ulScan + ulAr0Adj) & 7)));
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}
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else
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{
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CP_WRITE(pjBase, DWG_AR0, (ulScan + 7));
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}
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CP_WRITE(pjBase, DWG_FXBNDRY,
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(xRight << bfxright_SHIFT) |
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(xLeft & bfxleft_MASK));
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CP_START(pjBase, DWG_YDSTLEN, (yTrapezoid << yval_SHIFT) |
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(cyTrapezoid & ylength_MASK));
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}
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}
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else
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{
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cFifo = 0;
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lLeftError = ptd->aed[LEFT].lError;
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xLeft = ptd->aed[LEFT].x + xOffset;
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lRightError = ptd->aed[RIGHT].lError;
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xRight = ptd->aed[RIGHT].x + xOffset - 1; // Inclusive of edge
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while (TRUE)
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{
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/////////////////////////////////////////////////////////////////
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// Run the DDAs
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if (xLeft <= xRight)
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{
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// We get a little tricky here and try to amortize the cost of
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// the read for checking the FIFO count on the MGA. Doing
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// so got us a 25% win on large triangles on a P90.
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cFifo -= 4;
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if (cFifo < 0)
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{
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do
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{
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cFifo = GET_FIFO_SPACE(pjBase) - 4;
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} while (cFifo < 0);
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}
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ulScan = ulLinear + ulOffset + ((xLeft - xBrush) & 7);
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CP_WRITE(pjBase, DWG_AR3, ulScan);
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if (ulAr0Adj)
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{
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CP_WRITE(pjBase, DWG_AR0, ((ulScan & 0xfffffff8) |
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((ulScan + ulAr0Adj) & 7)));
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}
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else
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{
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CP_WRITE(pjBase, DWG_AR0, (ulScan + 7));
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}
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CP_WRITE(pjBase, DWG_FXBNDRY, (xRight << bfxright_SHIFT) |
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(xLeft & bfxleft_MASK));
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CP_START(pjBase, DWG_YDSTLEN, (yTrapezoid << yval_SHIFT) |
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(1 & ylength_MASK));
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}
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ulOffset = (ulOffset + (1 << PATTERN_PITCH_SHIFT)) &
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(7 << PATTERN_PITCH_SHIFT);
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yTrapezoid++;
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// Advance the right wall.
|
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xRight += ptd->aed[RIGHT].dx;
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lRightError += ptd->aed[RIGHT].lErrorUp;
|
||
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if (lRightError >= 0)
|
||
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{
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lRightError -= ptd->aed[RIGHT].dN;
|
||
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xRight++;
|
||
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}
|
||
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// Advance the left wall.
|
||
|
|
xLeft += ptd->aed[LEFT].dx;
|
||
|
|
lLeftError += ptd->aed[LEFT].lErrorUp;
|
||
|
|
|
||
|
|
if (lLeftError >= 0)
|
||
|
|
{
|
||
|
|
lLeftError -= ptd->aed[LEFT].dN;
|
||
|
|
xLeft++;
|
||
|
|
}
|
||
|
|
|
||
|
|
cyTrapezoid--;
|
||
|
|
if (cyTrapezoid == 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
ptd->aed[LEFT].lError = lLeftError;
|
||
|
|
ptd->aed[LEFT].x = xLeft - xOffset;
|
||
|
|
ptd->aed[RIGHT].lError = lRightError;
|
||
|
|
ptd->aed[RIGHT].x = xRight - xOffset + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/******************************Public*Routine******************************\
|
||
|
|
* VOID vMilTrapezoidSetup
|
||
|
|
*
|
||
|
|
* Initialize the hardware and some state for doing trapezoids.
|
||
|
|
*
|
||
|
|
\**************************************************************************/
|
||
|
|
|
||
|
|
VOID vMilTrapezoidSetup(
|
||
|
|
PDEV* ppdev,
|
||
|
|
ULONG rop4,
|
||
|
|
ULONG iSolidColor,
|
||
|
|
RBRUSH* prb,
|
||
|
|
POINTL* pptlBrush,
|
||
|
|
TRAPEZOIDDATA* ptd,
|
||
|
|
LONG yStart, // First scan for drawing
|
||
|
|
RECTL* prclClip) // NULL if no clipping
|
||
|
|
{
|
||
|
|
ULONG ulHwMix;
|
||
|
|
ULONG ulDwg;
|
||
|
|
LONG xOffset;
|
||
|
|
LONG yOffset;
|
||
|
|
BRUSHENTRY* pbe;
|
||
|
|
BYTE* pjBase;
|
||
|
|
|
||
|
|
pjBase = ppdev->pjBase;
|
||
|
|
ptd->ppdev = ppdev;
|
||
|
|
ptd->ulMgaSgn = 0;
|
||
|
|
|
||
|
|
xOffset = ppdev->xOffset;
|
||
|
|
yOffset = ppdev->yOffset;
|
||
|
|
|
||
|
|
if ((prclClip != NULL) && (prclClip->top > yStart))
|
||
|
|
yStart = prclClip->top;
|
||
|
|
|
||
|
|
if (iSolidColor != -1)
|
||
|
|
{
|
||
|
|
// Solid fill.
|
||
|
|
ptd->pfnTrap = vHardwareTrapezoid;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 3);
|
||
|
|
|
||
|
|
if (rop4 == 0xf0f0)
|
||
|
|
{
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, (opcode_TRAP + atype_RPL +
|
||
|
|
solid_SOLID + bop_SRCCOPY +
|
||
|
|
transc_BG_OPAQUE));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ulHwMix = (rop4 & 0x03) + ((rop4 & 0x30) >> 2);
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, (opcode_TRAP + atype_RSTR +
|
||
|
|
solid_SOLID + (ulHwMix << 16) +
|
||
|
|
transc_BG_OPAQUE));
|
||
|
|
}
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_FCOL, COLOR_REPLICATE(ppdev, iSolidColor));
|
||
|
|
CP_WRITE(pjBase, DWG_YDST, yStart + yOffset);
|
||
|
|
|
||
|
|
ppdev->HopeFlags = PATTERN_CACHE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Pattern fill.
|
||
|
|
if (prb->fl & RBRUSH_2COLOR)
|
||
|
|
{
|
||
|
|
// Monochrome brush.
|
||
|
|
ptd->pfnTrap = vHardwareTrapezoid;
|
||
|
|
|
||
|
|
if ((rop4 & 0xff) == 0xf0)
|
||
|
|
{
|
||
|
|
ulDwg = opcode_TRAP + atype_RPL + bop_SRCCOPY;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ulHwMix = (rop4 & 0x03) + ((rop4 & 0x30) >> 2);
|
||
|
|
ulDwg = opcode_TRAP + atype_RSTR + (ulHwMix << 16);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (((rop4 >> 8) & 0xff) == (rop4 & 0xff))
|
||
|
|
{
|
||
|
|
// Normal opaque mode.
|
||
|
|
ulDwg |= transc_BG_OPAQUE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// GDI guarantees us that if the foreground and background
|
||
|
|
// ROPs are different, the background rop is LEAVEALONE.
|
||
|
|
ulDwg |= transc_BG_TRANSP;
|
||
|
|
}
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 9);
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, ulDwg);
|
||
|
|
CP_WRITE(pjBase, DWG_FCOL, COLOR_REPLICATE(ppdev, prb->ulColor[1]));
|
||
|
|
CP_WRITE(pjBase, DWG_BCOL, COLOR_REPLICATE(ppdev, prb->ulColor[0]));
|
||
|
|
CP_WRITE(pjBase, DWG_SRC0, prb->aulPattern[0]);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC1, prb->aulPattern[1]);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC2, prb->aulPattern[2]);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC3, prb->aulPattern[3]);
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_YDST, yStart + yOffset);
|
||
|
|
CP_WRITE(pjBase, DWG_SHIFT,
|
||
|
|
((-(pptlBrush->y + ppdev->yOffset) & 7) << 4) |
|
||
|
|
(-(pptlBrush->x + ppdev->xOffset) & 7));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Color brush.
|
||
|
|
// We have to ensure that no other brush took our spot in
|
||
|
|
// off-screen memory.
|
||
|
|
pbe = prb->apbe[IBOARD(ppdev)];
|
||
|
|
if (pbe->prbVerify != prb)
|
||
|
|
{
|
||
|
|
// Download the brush into the cache.
|
||
|
|
if (ppdev->cjPelSize != 3)
|
||
|
|
{
|
||
|
|
vMilPatRealize(ppdev, prb);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
vMilPatRealize24bpp(ppdev, prb);
|
||
|
|
}
|
||
|
|
pbe = prb->apbe[IBOARD(ppdev)];
|
||
|
|
}
|
||
|
|
|
||
|
|
ptd->pfnTrap = vMilSoftwareTrapezoid;
|
||
|
|
ptd->ulLinear = pbe->ulLinear;
|
||
|
|
ptd->ptlBrush = *pptlBrush;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 2);
|
||
|
|
|
||
|
|
if (rop4 == 0xf0f0) // PATCOPY
|
||
|
|
{
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, (opcode_BITBLT + atype_RPL +
|
||
|
|
sgnzero_ZERO + shftzero_ZERO +
|
||
|
|
bop_SRCCOPY + bltmod_BFCOL +
|
||
|
|
pattern_ON + transc_BG_OPAQUE));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ulHwMix = (rop4 & 0x03) + ((rop4 & 0x30) >> 2);
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, (opcode_BITBLT + atype_RSTR +
|
||
|
|
sgnzero_ZERO + shftzero_ZERO +
|
||
|
|
(ulHwMix << 16) +
|
||
|
|
bltmod_BFCOL + pattern_ON +
|
||
|
|
transc_BG_OPAQUE));
|
||
|
|
}
|
||
|
|
CP_WRITE(pjBase, DWG_AR5, PATTERN_PITCH);
|
||
|
|
}
|
||
|
|
|
||
|
|
ppdev->HopeFlags = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (prclClip != NULL)
|
||
|
|
{
|
||
|
|
ptd->pfnTrapClip = ptd->pfnTrap;
|
||
|
|
ptd->pfnTrap = vClipTrapezoid;
|
||
|
|
ptd->yClipTop = prclClip->top;
|
||
|
|
ptd->yClipBottom = prclClip->bottom;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 2);
|
||
|
|
CP_WRITE(pjBase, DWG_CXLEFT, prclClip->left + xOffset);
|
||
|
|
CP_WRITE(pjBase, DWG_CXRIGHT, prclClip->right + xOffset - 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/******************************Public*Routine******************************\
|
||
|
|
* VOID vMgaSoftwareTrapezoid
|
||
|
|
*
|
||
|
|
* Draws a trapezoid using a software DDA.
|
||
|
|
*
|
||
|
|
\**************************************************************************/
|
||
|
|
|
||
|
|
VOID vMgaSoftwareTrapezoid(
|
||
|
|
TRAPEZOIDDATA* ptd,
|
||
|
|
LONG yTrapezoid,
|
||
|
|
LONG cyTrapezoid)
|
||
|
|
{
|
||
|
|
PDEV* ppdev;
|
||
|
|
BYTE* pjBase;
|
||
|
|
LONG xOffset;
|
||
|
|
LONG xBrush;
|
||
|
|
ULONG ulOffset;
|
||
|
|
ULONG ulLinear;
|
||
|
|
ULONG ulScan;
|
||
|
|
CHAR cFifo;
|
||
|
|
LONG lLeftError;
|
||
|
|
LONG xLeft;
|
||
|
|
LONG lRightError;
|
||
|
|
LONG xRight;
|
||
|
|
|
||
|
|
ppdev = ptd->ppdev;
|
||
|
|
pjBase = ppdev->pjBase;
|
||
|
|
xBrush = ptd->ptlBrush.x;
|
||
|
|
|
||
|
|
ulOffset = ((yTrapezoid - ptd->ptlBrush.y) & 7) << 5;
|
||
|
|
ulLinear = ptd->ulLinear;
|
||
|
|
|
||
|
|
xOffset = ppdev->xOffset;
|
||
|
|
yTrapezoid += ppdev->yOffset;
|
||
|
|
|
||
|
|
// If the left and right edges are vertical, simply output as
|
||
|
|
// a rectangle:
|
||
|
|
|
||
|
|
if (((ptd->aed[LEFT].lErrorUp | ptd->aed[RIGHT].lErrorUp) == 0) &&
|
||
|
|
((ptd->aed[LEFT].dx | ptd->aed[RIGHT].dx) == 0))
|
||
|
|
{
|
||
|
|
xLeft = ptd->aed[LEFT].x + xOffset;
|
||
|
|
xRight = ptd->aed[RIGHT].x + xOffset - 1; // Inclusive of edge
|
||
|
|
if (xLeft <= xRight)
|
||
|
|
{
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 6);
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_FXLEFT, xLeft); // xOffset already added in
|
||
|
|
CP_WRITE(pjBase, DWG_FXRIGHT, xRight);
|
||
|
|
|
||
|
|
ulScan = ulLinear + ulOffset;
|
||
|
|
CP_WRITE(pjBase, DWG_AR3, ulScan + ((xLeft - xBrush) & 7));
|
||
|
|
CP_WRITE(pjBase, DWG_AR0, ulScan + 15);
|
||
|
|
CP_WRITE(pjBase, DWG_LEN, cyTrapezoid);
|
||
|
|
CP_START(pjBase, DWG_YDST, yTrapezoid);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
cFifo = 0;
|
||
|
|
lLeftError = ptd->aed[LEFT].lError;
|
||
|
|
xLeft = ptd->aed[LEFT].x + xOffset;
|
||
|
|
lRightError = ptd->aed[RIGHT].lError;
|
||
|
|
xRight = ptd->aed[RIGHT].x + xOffset - 1; // Inclusive of edge
|
||
|
|
|
||
|
|
while (TRUE)
|
||
|
|
{
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
// Run the DDAs
|
||
|
|
|
||
|
|
if (xLeft <= xRight)
|
||
|
|
{
|
||
|
|
// We get a little tricky here and try to amortize the cost of
|
||
|
|
// the read for checking the FIFO count on the MGA. Doing
|
||
|
|
// so got us a 25% win on large triangles on a P90:
|
||
|
|
|
||
|
|
cFifo -= 6;
|
||
|
|
if (cFifo < 0)
|
||
|
|
{
|
||
|
|
do {
|
||
|
|
cFifo = GET_FIFO_SPACE(pjBase) - 6;
|
||
|
|
} while (cFifo < 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_FXLEFT, xLeft);
|
||
|
|
CP_WRITE(pjBase, DWG_FXRIGHT, xRight);
|
||
|
|
|
||
|
|
ulScan = ulLinear + ulOffset;
|
||
|
|
CP_WRITE(pjBase, DWG_AR0, ulScan + 15);
|
||
|
|
CP_WRITE(pjBase, DWG_AR3, ulScan + ((xLeft - xBrush) & 7));
|
||
|
|
CP_WRITE(pjBase, DWG_LEN, 1);
|
||
|
|
CP_START(pjBase, DWG_YDST, yTrapezoid);
|
||
|
|
}
|
||
|
|
|
||
|
|
ulOffset = (ulOffset + (1 << 5)) & (7 << 5);
|
||
|
|
yTrapezoid++;
|
||
|
|
|
||
|
|
// Advance the right wall:
|
||
|
|
|
||
|
|
xRight += ptd->aed[RIGHT].dx;
|
||
|
|
lRightError += ptd->aed[RIGHT].lErrorUp;
|
||
|
|
|
||
|
|
if (lRightError >= 0)
|
||
|
|
{
|
||
|
|
lRightError -= ptd->aed[RIGHT].dN;
|
||
|
|
xRight++;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Advance the left wall:
|
||
|
|
|
||
|
|
xLeft += ptd->aed[LEFT].dx;
|
||
|
|
lLeftError += ptd->aed[LEFT].lErrorUp;
|
||
|
|
|
||
|
|
if (lLeftError >= 0)
|
||
|
|
{
|
||
|
|
lLeftError -= ptd->aed[LEFT].dN;
|
||
|
|
xLeft++;
|
||
|
|
}
|
||
|
|
|
||
|
|
cyTrapezoid--;
|
||
|
|
if (cyTrapezoid == 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
ptd->aed[LEFT].lError = lLeftError;
|
||
|
|
ptd->aed[LEFT].x = xLeft - xOffset;
|
||
|
|
ptd->aed[RIGHT].lError = lRightError;
|
||
|
|
ptd->aed[RIGHT].x = xRight - xOffset + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/******************************Public*Routine******************************\
|
||
|
|
* VOID vMgaTrapezoidSetup
|
||
|
|
*
|
||
|
|
* Initialize the hardware and some state for doing trapezoids.
|
||
|
|
*
|
||
|
|
\**************************************************************************/
|
||
|
|
|
||
|
|
VOID vMgaTrapezoidSetup(
|
||
|
|
PDEV* ppdev,
|
||
|
|
ULONG rop4,
|
||
|
|
ULONG iSolidColor,
|
||
|
|
RBRUSH* prb,
|
||
|
|
POINTL* pptlBrush,
|
||
|
|
TRAPEZOIDDATA* ptd,
|
||
|
|
LONG yStart, // First scan for drawing
|
||
|
|
RECTL* prclClip) // NULL if no clipping
|
||
|
|
{
|
||
|
|
BYTE* pjBase;
|
||
|
|
ULONG ulHwMix;
|
||
|
|
ULONG ulDwg;
|
||
|
|
BRUSHENTRY* pbe;
|
||
|
|
|
||
|
|
ptd->ppdev = ppdev;
|
||
|
|
ptd->ulMgaSgn = 0;
|
||
|
|
pjBase = ppdev->pjBase;
|
||
|
|
|
||
|
|
if ((prclClip != NULL) && (prclClip->top > yStart))
|
||
|
|
yStart = prclClip->top;
|
||
|
|
|
||
|
|
if (iSolidColor != -1)
|
||
|
|
{
|
||
|
|
ptd->pfnTrap = vHardwareTrapezoid;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 7);
|
||
|
|
|
||
|
|
if (rop4 == 0xf0f0)
|
||
|
|
{
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, opcode_TRAP + transc_BG_OPAQUE +
|
||
|
|
blockm_ON + atype_RPL + bop_SRCCOPY);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ulHwMix = (rop4 & 0x03) + ((rop4 & 0x30) >> 2);
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, opcode_TRAP + transc_BG_OPAQUE +
|
||
|
|
blockm_OFF + atype_RSTR +
|
||
|
|
(ulHwMix << 16));
|
||
|
|
}
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_FCOL, COLOR_REPLICATE(ppdev, iSolidColor));
|
||
|
|
CP_WRITE(pjBase, DWG_YDST, yStart + ppdev->yOffset);
|
||
|
|
|
||
|
|
if (!(GET_CACHE_FLAGS(ppdev, PATTERN_CACHE)))
|
||
|
|
{
|
||
|
|
CP_WRITE(pjBase, DWG_SRC0, 0xFFFFFFFF);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC1, 0xFFFFFFFF);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC2, 0xFFFFFFFF);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC3, 0xFFFFFFFF);
|
||
|
|
}
|
||
|
|
|
||
|
|
ppdev->HopeFlags = PATTERN_CACHE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (prb->fl & RBRUSH_2COLOR)
|
||
|
|
{
|
||
|
|
ptd->pfnTrap = vHardwareTrapezoid;
|
||
|
|
|
||
|
|
if ((rop4 & 0xff) == 0xf0)
|
||
|
|
{
|
||
|
|
ulDwg = opcode_TRAP + blockm_OFF + atype_RPL + bop_SRCCOPY;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
ulHwMix = (rop4 & 0x03) + ((rop4 & 0x30) >> 2);
|
||
|
|
|
||
|
|
ulDwg = opcode_TRAP + blockm_OFF + atype_RSTR + (ulHwMix << 16);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (((rop4 >> 8) & 0xff) == (rop4 & 0xff))
|
||
|
|
{
|
||
|
|
// Normal opaque mode:
|
||
|
|
|
||
|
|
ulDwg |= transc_BG_OPAQUE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// GDI guarantees us that if the foreground and background
|
||
|
|
// ROPs are different, the background rop is LEAVEALONE:
|
||
|
|
|
||
|
|
ulDwg |= transc_BG_TRANSP;
|
||
|
|
}
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 9);
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, ulDwg);
|
||
|
|
CP_WRITE(pjBase, DWG_FCOL, COLOR_REPLICATE(ppdev, prb->ulColor[1]));
|
||
|
|
CP_WRITE(pjBase, DWG_BCOL, COLOR_REPLICATE(ppdev, prb->ulColor[0]));
|
||
|
|
CP_WRITE(pjBase, DWG_SRC0, prb->aulPattern[0]);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC1, prb->aulPattern[1]);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC2, prb->aulPattern[2]);
|
||
|
|
CP_WRITE(pjBase, DWG_SRC3, prb->aulPattern[3]);
|
||
|
|
CP_WRITE(pjBase, DWG_YDST, yStart + ppdev->yOffset);
|
||
|
|
CP_WRITE(pjBase, DWG_SHIFT,
|
||
|
|
((-(pptlBrush->y + ppdev->yOffset) & 7) << 4) |
|
||
|
|
(-(pptlBrush->x + ppdev->xOffset) & 7));
|
||
|
|
|
||
|
|
ppdev->HopeFlags = 0;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// We have to ensure that no other brush took our spot in off-screen
|
||
|
|
// memory:
|
||
|
|
|
||
|
|
ASSERTDD(ppdev->iBitmapFormat == BMF_8BPP,
|
||
|
|
"Can only do 8bpp patterned fastfills");
|
||
|
|
|
||
|
|
if (prb->apbe[IBOARD(ppdev)]->prbVerify != prb)
|
||
|
|
{
|
||
|
|
vMgaPatRealize8bpp(ppdev, prb);
|
||
|
|
}
|
||
|
|
|
||
|
|
pjBase = ppdev->pjBase;
|
||
|
|
pbe = prb->apbe[IBOARD(ppdev)];
|
||
|
|
|
||
|
|
ptd->pfnTrap = vMgaSoftwareTrapezoid;
|
||
|
|
ptd->ulLinear = pbe->ulLinear;
|
||
|
|
ptd->ptlBrush = *pptlBrush;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 4);
|
||
|
|
|
||
|
|
if (rop4 == 0xf0f0) // PATCOPY
|
||
|
|
{
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, (opcode_BITBLT + atype_RPL + blockm_OFF +
|
||
|
|
trans_0 + bltmod_BFCOL + pattern_ON +
|
||
|
|
transc_BG_OPAQUE + bop_SRCCOPY));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
RIP("Shouldn't allow ROPs for now, because of h/w bug!");
|
||
|
|
|
||
|
|
ulHwMix = (rop4 & 0x03) + ((rop4 & 0x30) >> 2);
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_DWGCTL, (opcode_BITBLT + atype_RSTR + blockm_OFF +
|
||
|
|
trans_0 + bltmod_BFCOL + pattern_ON +
|
||
|
|
transc_BG_OPAQUE + (ulHwMix << 16)));
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!(GET_CACHE_FLAGS(ppdev, SIGN_CACHE)))
|
||
|
|
{
|
||
|
|
CP_WRITE(pjBase, DWG_SGN, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
ppdev->HopeFlags = SIGN_CACHE;
|
||
|
|
|
||
|
|
CP_WRITE(pjBase, DWG_SHIFT, 0);
|
||
|
|
CP_WRITE(pjBase, DWG_AR5, 32);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (prclClip != NULL)
|
||
|
|
{
|
||
|
|
ptd->pfnTrapClip = ptd->pfnTrap;
|
||
|
|
ptd->pfnTrap = vClipTrapezoid;
|
||
|
|
ptd->yClipTop = prclClip->top;
|
||
|
|
ptd->yClipBottom = prclClip->bottom;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 2);
|
||
|
|
CP_WRITE(pjBase, DWG_CXLEFT, ppdev->xOffset + prclClip->left);
|
||
|
|
CP_WRITE(pjBase, DWG_CXRIGHT, ppdev->xOffset + prclClip->right - 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/******************************Public*Routine******************************\
|
||
|
|
* BOOL bFastFill
|
||
|
|
*
|
||
|
|
* Draws a non-complex, unclipped polygon. 'Non-complex' is defined as
|
||
|
|
* having only two edges that are monotonic increasing in 'y'. That is,
|
||
|
|
* the polygon cannot have more than one disconnected segment on any given
|
||
|
|
* scan. Note that the edges of the polygon can self-intersect, so hourglass
|
||
|
|
* shapes are permissible. This restriction permits this routine to run two
|
||
|
|
* simultaneous DDAs, and no sorting of the edges is required.
|
||
|
|
*
|
||
|
|
* Note that NT's fill convention is different from that of Win 3.1 or Win95.
|
||
|
|
* With the additional complication of fractional end-points, our convention
|
||
|
|
* is the same as in 'X-Windows'. But a DDA is a DDA is a DDA, so once you
|
||
|
|
* figure out how we compute the DDA terms for NT, you're golden.
|
||
|
|
*
|
||
|
|
* Returns TRUE if the polygon was drawn; FALSE if the polygon was complex.
|
||
|
|
*
|
||
|
|
\**************************************************************************/
|
||
|
|
|
||
|
|
BOOL bFastFill(
|
||
|
|
PDEV* ppdev,
|
||
|
|
LONG cEdges, // Includes close figure edge
|
||
|
|
POINTFIX* pptfxFirst,
|
||
|
|
ULONG rop4,
|
||
|
|
ULONG iSolidColor,
|
||
|
|
RBRUSH* prb,
|
||
|
|
POINTL* pptlBrush,
|
||
|
|
RECTL* prclClip) // NULL if no clipping
|
||
|
|
{
|
||
|
|
LONG yTrapezoid; // Top scan for next trapezoid
|
||
|
|
LONG cyTrapezoid; // Number of scans in current trapezoid
|
||
|
|
LONG yStart; // y-position of start point in current edge
|
||
|
|
LONG dM; // Edge delta in FIX units in x direction
|
||
|
|
LONG dN; // Edge delta in FIX units in y direction
|
||
|
|
LONG i;
|
||
|
|
LONG lCross; // Cross-product result
|
||
|
|
POINTFIX* pptfxLast; // Points to the last point in the polygon array
|
||
|
|
POINTFIX* pptfxTop; // Points to the top-most point in the polygon
|
||
|
|
POINTFIX* pptfxOld; // Start point in current edge
|
||
|
|
POINTFIX* pptfxScan; // Current edge pointer for finding pptfxTop
|
||
|
|
LONG cScanEdges; // Number of edges scanned to find pptfxTop
|
||
|
|
// (doesn't include the closefigure edge)
|
||
|
|
LONG iEdge;
|
||
|
|
LONG lQuotient;
|
||
|
|
LONG lRemainder;
|
||
|
|
BYTE* pjBase;
|
||
|
|
|
||
|
|
TRAPEZOIDDATA td; // Edge data and stuff
|
||
|
|
EDGEDATA* ped; // Points to current edge being processed
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
// See if the polygon is convex
|
||
|
|
|
||
|
|
pptfxScan = pptfxFirst;
|
||
|
|
pptfxTop = pptfxFirst; // Assume for now that the first
|
||
|
|
// point in path is the topmost
|
||
|
|
pptfxLast = pptfxFirst + cEdges - 1;
|
||
|
|
|
||
|
|
// Watch for close figure points, because we have the later restriction
|
||
|
|
// that we won't allow coincident vertices:
|
||
|
|
|
||
|
|
if ((pptfxLast->x == pptfxFirst->x) && (pptfxLast->y == pptfxFirst->y))
|
||
|
|
{
|
||
|
|
pptfxLast--;
|
||
|
|
cEdges--;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cEdges <= 2)
|
||
|
|
goto ReturnTrue;
|
||
|
|
|
||
|
|
// 'pptfxScan' will always point to the first point in the current
|
||
|
|
// edge, and 'cScanEdges' will the number of edges remaining, including
|
||
|
|
// the current one:
|
||
|
|
|
||
|
|
cScanEdges = cEdges - 1; // The number of edges, not counting close figure
|
||
|
|
|
||
|
|
if ((pptfxScan + 1)->y > pptfxScan->y)
|
||
|
|
{
|
||
|
|
// Collect all downs:
|
||
|
|
|
||
|
|
do {
|
||
|
|
if (--cScanEdges == 0)
|
||
|
|
goto SetUpForFilling;
|
||
|
|
pptfxScan++;
|
||
|
|
} while ((pptfxScan + 1)->y >= pptfxScan->y);
|
||
|
|
|
||
|
|
// Collect all ups:
|
||
|
|
|
||
|
|
do {
|
||
|
|
if (--cScanEdges == 0)
|
||
|
|
goto SetUpForFillingCheck;
|
||
|
|
pptfxScan++;
|
||
|
|
} while ((pptfxScan + 1)->y <= pptfxScan->y);
|
||
|
|
|
||
|
|
// Collect all downs:
|
||
|
|
|
||
|
|
pptfxTop = pptfxScan;
|
||
|
|
|
||
|
|
do {
|
||
|
|
if ((pptfxScan + 1)->y > pptfxFirst->y)
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (--cScanEdges == 0)
|
||
|
|
goto SetUpForFilling;
|
||
|
|
pptfxScan++;
|
||
|
|
} while ((pptfxScan + 1)->y >= pptfxScan->y);
|
||
|
|
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Collect all ups:
|
||
|
|
|
||
|
|
do {
|
||
|
|
pptfxTop++; // We increment this now because we
|
||
|
|
// want it to point to the very last
|
||
|
|
// point if we early out in the next
|
||
|
|
// statement...
|
||
|
|
if (--cScanEdges == 0)
|
||
|
|
goto SetUpForFilling;
|
||
|
|
} while ((pptfxTop + 1)->y <= pptfxTop->y);
|
||
|
|
|
||
|
|
// Collect all downs:
|
||
|
|
|
||
|
|
pptfxScan = pptfxTop;
|
||
|
|
do {
|
||
|
|
if (--cScanEdges == 0)
|
||
|
|
goto SetUpForFilling;
|
||
|
|
pptfxScan++;
|
||
|
|
} while ((pptfxScan + 1)->y >= pptfxScan->y);
|
||
|
|
|
||
|
|
// Collect all ups:
|
||
|
|
|
||
|
|
do {
|
||
|
|
if ((pptfxScan + 1)->y < pptfxFirst->y)
|
||
|
|
break;
|
||
|
|
|
||
|
|
if (--cScanEdges == 0)
|
||
|
|
goto SetUpForFilling;
|
||
|
|
pptfxScan++;
|
||
|
|
} while ((pptfxScan + 1)->y <= pptfxScan->y);
|
||
|
|
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
|
||
|
|
SetUpForFillingCheck:
|
||
|
|
|
||
|
|
// We check to see if the end of the current edge is higher
|
||
|
|
// than the top edge we've found so far:
|
||
|
|
|
||
|
|
if ((pptfxScan + 1)->y < pptfxTop->y)
|
||
|
|
pptfxTop = pptfxScan + 1;
|
||
|
|
|
||
|
|
SetUpForFilling:
|
||
|
|
|
||
|
|
pptfxScan = pptfxFirst;
|
||
|
|
cScanEdges = cEdges - 2;
|
||
|
|
|
||
|
|
// NOTE: For a bit of speed and simplicity, we will assume that
|
||
|
|
// our cross product calculations will not overflow. A
|
||
|
|
// consequence of this is that the caller MUST ensure that
|
||
|
|
// the bounds of the polygon are small enough that there
|
||
|
|
// will be no overflow.
|
||
|
|
|
||
|
|
lCross = (((pptfxScan + 1)->x - (pptfxScan + 0)->x)
|
||
|
|
* ((pptfxScan + 2)->y - (pptfxScan + 1)->y)
|
||
|
|
- ((pptfxScan + 1)->y - (pptfxScan + 0)->y)
|
||
|
|
* ((pptfxScan + 2)->x - (pptfxScan + 1)->x));
|
||
|
|
|
||
|
|
if (lCross == 0)
|
||
|
|
{
|
||
|
|
// We don't allow any colinear points into FastFill. We do this
|
||
|
|
// here because we would need a non-zero cross product to determine
|
||
|
|
// which direction the rest of the edges should go. We do this
|
||
|
|
// later so that coincident vertices will never mess us up by
|
||
|
|
// hiding a cross product sign change.
|
||
|
|
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
else if (lCross > 0)
|
||
|
|
{
|
||
|
|
// Make sure all cross products are positive:
|
||
|
|
|
||
|
|
pptfxScan++;
|
||
|
|
while (--cScanEdges != 0)
|
||
|
|
{
|
||
|
|
if (((pptfxScan + 1)->x - (pptfxScan + 0)->x)
|
||
|
|
* ((pptfxScan + 2)->y - (pptfxScan + 1)->y)
|
||
|
|
- ((pptfxScan + 1)->y - (pptfxScan + 0)->y)
|
||
|
|
* ((pptfxScan + 2)->x - (pptfxScan + 1)->x) <= 0)
|
||
|
|
{
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
pptfxScan++;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check the angles formed by the closefigure edge:
|
||
|
|
|
||
|
|
if (((pptfxScan + 1)->x - (pptfxScan + 0)->x)
|
||
|
|
* ((pptfxFirst )->y - (pptfxScan + 1)->y)
|
||
|
|
- ((pptfxScan + 1)->y - (pptfxScan + 0)->y)
|
||
|
|
* ((pptfxFirst )->x - (pptfxScan + 1)->x) <= 0)
|
||
|
|
{
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (((pptfxFirst )->x - (pptfxScan + 1)->x)
|
||
|
|
* ((pptfxFirst + 1)->y - (pptfxFirst )->y)
|
||
|
|
- ((pptfxFirst )->y - (pptfxScan + 1)->y)
|
||
|
|
* ((pptfxFirst + 1)->x - (pptfxFirst )->x) <= 0)
|
||
|
|
{
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
|
||
|
|
// The figure has its points ordered in a clockwise direction:
|
||
|
|
|
||
|
|
td.aed[LEFT].dptfx = -(LONG) sizeof(POINTFIX);
|
||
|
|
td.aed[RIGHT].dptfx = sizeof(POINTFIX);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Make sure all cross products are negative:
|
||
|
|
|
||
|
|
pptfxScan++;
|
||
|
|
while (--cScanEdges != 0)
|
||
|
|
{
|
||
|
|
if (((pptfxScan + 1)->x - (pptfxScan + 0)->x)
|
||
|
|
* ((pptfxScan + 2)->y - (pptfxScan + 1)->y)
|
||
|
|
- ((pptfxScan + 1)->y - (pptfxScan + 0)->y)
|
||
|
|
* ((pptfxScan + 2)->x - (pptfxScan + 1)->x) >= 0)
|
||
|
|
{
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
pptfxScan++;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Check the angles formed by the closefigure edge:
|
||
|
|
|
||
|
|
if (((pptfxScan + 1)->x - (pptfxScan + 0)->x)
|
||
|
|
* ((pptfxFirst )->y - (pptfxScan + 1)->y)
|
||
|
|
- ((pptfxScan + 1)->y - (pptfxScan + 0)->y)
|
||
|
|
* ((pptfxFirst )->x - (pptfxScan + 1)->x) >= 0)
|
||
|
|
{
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (((pptfxFirst )->x - (pptfxScan + 1)->x)
|
||
|
|
* ((pptfxFirst + 1)->y - (pptfxFirst )->y)
|
||
|
|
- ((pptfxFirst )->y - (pptfxScan + 1)->y)
|
||
|
|
* ((pptfxFirst + 1)->x - (pptfxFirst )->x) >= 0)
|
||
|
|
{
|
||
|
|
goto ReturnFalse;
|
||
|
|
}
|
||
|
|
|
||
|
|
// The figure has its points ordered in a counter-clockwise direction:
|
||
|
|
|
||
|
|
td.aed[LEFT].dptfx = sizeof(POINTFIX);
|
||
|
|
td.aed[RIGHT].dptfx = -(LONG) sizeof(POINTFIX);
|
||
|
|
}
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
// Some Initialization
|
||
|
|
|
||
|
|
td.aed[LEFT].pptfx = pptfxTop;
|
||
|
|
td.aed[RIGHT].pptfx = pptfxTop;
|
||
|
|
|
||
|
|
yTrapezoid = (pptfxTop->y + 15) >> 4;
|
||
|
|
|
||
|
|
// Make sure we initialize the DDAs appropriately:
|
||
|
|
|
||
|
|
td.aed[LEFT].cy = 0;
|
||
|
|
td.aed[RIGHT].cy = 0;
|
||
|
|
|
||
|
|
if (ppdev->ulBoardId == MGA_STORM)
|
||
|
|
{
|
||
|
|
vMilTrapezoidSetup(ppdev, rop4, iSolidColor, prb, pptlBrush, &td,
|
||
|
|
yTrapezoid, prclClip);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
vMgaTrapezoidSetup(ppdev, rop4, iSolidColor, prb, pptlBrush, &td,
|
||
|
|
yTrapezoid, prclClip);
|
||
|
|
}
|
||
|
|
|
||
|
|
NewTrapezoid:
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////
|
||
|
|
// DDA initialization
|
||
|
|
|
||
|
|
for (iEdge = 1; iEdge >= 0; iEdge--)
|
||
|
|
{
|
||
|
|
ped = &td.aed[iEdge];
|
||
|
|
ped->bNew = FALSE;
|
||
|
|
if (ped->cy == 0)
|
||
|
|
{
|
||
|
|
// Our trapezoid drawing routine may want to be notified when
|
||
|
|
// it will have to reset its DDA to start a new edge:
|
||
|
|
|
||
|
|
ped->bNew = TRUE;
|
||
|
|
|
||
|
|
// Need a new DDA:
|
||
|
|
|
||
|
|
do {
|
||
|
|
cEdges--;
|
||
|
|
if (cEdges < 0)
|
||
|
|
goto ResetClippingAndReturnTrue;
|
||
|
|
|
||
|
|
// Find the next left edge, accounting for wrapping:
|
||
|
|
|
||
|
|
pptfxOld = ped->pptfx;
|
||
|
|
ped->pptfx = (POINTFIX*) ((BYTE*) ped->pptfx + ped->dptfx);
|
||
|
|
|
||
|
|
if (ped->pptfx < pptfxFirst)
|
||
|
|
ped->pptfx = pptfxLast;
|
||
|
|
else if (ped->pptfx > pptfxLast)
|
||
|
|
ped->pptfx = pptfxFirst;
|
||
|
|
|
||
|
|
// Have to find the edge that spans yTrapezoid:
|
||
|
|
|
||
|
|
ped->cy = ((ped->pptfx->y + 15) >> 4) - yTrapezoid;
|
||
|
|
|
||
|
|
// With fractional coordinate end points, we may get edges
|
||
|
|
// that don't cross any scans, in which case we try the
|
||
|
|
// next one:
|
||
|
|
|
||
|
|
} while (ped->cy <= 0);
|
||
|
|
|
||
|
|
// 'pptfx' now points to the end point of the edge spanning
|
||
|
|
// the scan 'yTrapezoid'.
|
||
|
|
|
||
|
|
dN = ped->pptfx->y - pptfxOld->y;
|
||
|
|
dM = ped->pptfx->x - pptfxOld->x;
|
||
|
|
|
||
|
|
ASSERTDD(dN > 0, "Should be going down only");
|
||
|
|
|
||
|
|
// Compute the DDA increment terms:
|
||
|
|
|
||
|
|
ped->dM = dM; // Not used for software trapezoid
|
||
|
|
|
||
|
|
if (dM < 0)
|
||
|
|
{
|
||
|
|
dM = -dM;
|
||
|
|
if (dM < dN) // Can't be '<='
|
||
|
|
{
|
||
|
|
ped->dx = -1;
|
||
|
|
ped->lErrorUp = dN - dM;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
QUOTIENT_REMAINDER(dM, dN, lQuotient, lRemainder);
|
||
|
|
|
||
|
|
ped->dx = -lQuotient; // - dM / dN
|
||
|
|
ped->lErrorUp = lRemainder; // dM % dN
|
||
|
|
if (ped->lErrorUp > 0)
|
||
|
|
{
|
||
|
|
ped->dx--;
|
||
|
|
ped->lErrorUp = dN - ped->lErrorUp;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (dM < dN) // Can't be '<='
|
||
|
|
{
|
||
|
|
ped->dx = 0;
|
||
|
|
ped->lErrorUp = dM;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
QUOTIENT_REMAINDER(dM, dN, lQuotient, lRemainder);
|
||
|
|
|
||
|
|
ped->dx = lQuotient; // dM / dN
|
||
|
|
ped->lErrorUp = lRemainder; // dM % dN
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
ped->dN = dN; // DDA limit
|
||
|
|
ped->lError = -1; // Error is initially zero (add dN - 1 for
|
||
|
|
// the ceiling, but subtract off dN so that
|
||
|
|
// we can check the sign instead of comparing
|
||
|
|
// to dN)
|
||
|
|
|
||
|
|
ped->x = pptfxOld->x;
|
||
|
|
yStart = pptfxOld->y;
|
||
|
|
|
||
|
|
if ((yStart & 15) != 0)
|
||
|
|
{
|
||
|
|
// Advance to the next integer y coordinate
|
||
|
|
|
||
|
|
for (i = 16 - (yStart & 15); i != 0; i--)
|
||
|
|
{
|
||
|
|
ped->x += ped->dx;
|
||
|
|
ped->lError += ped->lErrorUp;
|
||
|
|
if (ped->lError >= 0)
|
||
|
|
{
|
||
|
|
ped->lError -= ped->dN;
|
||
|
|
ped->x++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ((ped->x & 15) != 0)
|
||
|
|
{
|
||
|
|
ped->lError -= ped->dN * (16 - (ped->x & 15));
|
||
|
|
ped->x += 15; // We'll want the ceiling in just a bit...
|
||
|
|
}
|
||
|
|
|
||
|
|
// Chop off those fractional bits:
|
||
|
|
|
||
|
|
ped->x >>= 4;
|
||
|
|
ped->lError >>= 4;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
cyTrapezoid = min(td.aed[LEFT].cy, td.aed[RIGHT].cy); // # of scans in this trap
|
||
|
|
td.aed[LEFT].cy -= cyTrapezoid;
|
||
|
|
td.aed[RIGHT].cy -= cyTrapezoid;
|
||
|
|
|
||
|
|
td.pfnTrap(&td, yTrapezoid, cyTrapezoid);
|
||
|
|
|
||
|
|
yTrapezoid += cyTrapezoid;
|
||
|
|
|
||
|
|
goto NewTrapezoid;
|
||
|
|
|
||
|
|
ResetClippingAndReturnTrue:
|
||
|
|
|
||
|
|
if (prclClip != NULL)
|
||
|
|
{
|
||
|
|
pjBase = ppdev->pjBase;
|
||
|
|
|
||
|
|
CHECK_FIFO_SPACE(pjBase, 2);
|
||
|
|
CP_WRITE(pjBase, DWG_CXLEFT, 0);
|
||
|
|
CP_WRITE(pjBase, DWG_CXRIGHT, ppdev->cxMemory - 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
ReturnTrue:
|
||
|
|
|
||
|
|
return(TRUE);
|
||
|
|
|
||
|
|
ReturnFalse:
|
||
|
|
|
||
|
|
return(FALSE);
|
||
|
|
}
|
||
|
|
|