423 lines
13 KiB
C
423 lines
13 KiB
C
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/******************************Module*Header*******************************\
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* Module Name: fastfill.c
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*
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* Fills solid-coloured, unclipped, non-complex rectangles.
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*
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* Copyright (c) 1993-1994 Microsoft Corporation
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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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#define SWAP(a, b, tmp) { tmp = a; a = b; b = tmp; }
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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 lErrorDown; // DDA error adjustment
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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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} EDGEDATA; /* ed, ped */
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/******************************Public*Routine******************************\
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* bFastFill
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*
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* Draws a non-complex, unclipped polygon.
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*
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* Returns TRUE if the polygon was drawn; FALSE if the polygon was complex.
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*
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\**************************************************************************/
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BOOL bFastFill(
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PPDEV ppdev,
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LONG cEdges, // Includes close figure edge
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POINTFIX* pptfxFirst,
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ULONG ulHwMix,
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ULONG iSolidColor)
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{
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LONG yTrapezoid; // Top scan for next trapezoid
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LONG cyTrapezoid; // Number of scans in current trapezoid
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LONG yStart; // y-position of start point in current edge
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LONG dM; // Edge delta in FIX units in x direction
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LONG dN; // Edge delta in FIX units in y direction
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LONG i;
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POINTFIX* pptfxLast; // Points to the last point in the polygon array
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POINTFIX* pptfxTop; // Points to the top-most point in the polygon
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POINTFIX* pptfxOld; // Start point in current edge
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POINTFIX* pptfxScan; // Current edge pointer for finding pptfxTop
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LONG cScanEdges; // Number of edges scanned to find pptfxTop
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// (doesn't include the closefigure edge)
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LONG iEdge;
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LONG lQuotient;
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LONG lRemainder;
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EDGEDATA aed[2]; // DDA terms and stuff
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EDGEDATA* ped;
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pptfxScan = pptfxFirst;
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pptfxTop = pptfxFirst; // Assume for now that the first
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// point in path is the topmost
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pptfxLast = pptfxFirst + cEdges - 1;
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// 'pptfxScan' will always point to the first point in the current
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// edge, and 'cScanEdges' will the number of edges remaining, including
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// the current one:
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cScanEdges = cEdges - 1; // The number of edges, not counting close figure
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if ((pptfxScan + 1)->y > pptfxScan->y)
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{
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// Collect all downs:
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do {
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if (--cScanEdges == 0)
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goto SetUpForFilling;
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pptfxScan++;
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} while ((pptfxScan + 1)->y >= pptfxScan->y);
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// Collect all ups:
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do {
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if (--cScanEdges == 0)
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goto SetUpForFillingCheck;
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pptfxScan++;
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} while ((pptfxScan + 1)->y <= pptfxScan->y);
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// Collect all downs:
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pptfxTop = pptfxScan;
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do {
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if ((pptfxScan + 1)->y > pptfxFirst->y)
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break;
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if (--cScanEdges == 0)
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goto SetUpForFilling;
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pptfxScan++;
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} while ((pptfxScan + 1)->y >= pptfxScan->y);
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return(FALSE);
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}
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else
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{
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// Collect all ups:
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do {
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pptfxTop++; // We increment this now because we
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// want it to point to the very last
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// point if we early out in the next
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// statement...
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if (--cScanEdges == 0)
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goto SetUpForFilling;
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} while ((pptfxTop + 1)->y <= pptfxTop->y);
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// Collect all downs:
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pptfxScan = pptfxTop;
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do {
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if (--cScanEdges == 0)
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goto SetUpForFilling;
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pptfxScan++;
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} while ((pptfxScan + 1)->y >= pptfxScan->y);
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// Collect all ups:
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do {
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if ((pptfxScan + 1)->y < pptfxFirst->y)
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break;
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if (--cScanEdges == 0)
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goto SetUpForFilling;
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pptfxScan++;
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} while ((pptfxScan + 1)->y <= pptfxScan->y);
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return(FALSE);
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}
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SetUpForFillingCheck:
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// We check to see if the end of the current edge is higher
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// than the top edge we've found so far:
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if ((pptfxScan + 1)->y < pptfxTop->y)
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pptfxTop = pptfxScan + 1;
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SetUpForFilling:
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yTrapezoid = (pptfxTop->y + 15) >> 4;
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// We initialize the hardware for the colour, mix, pixel operation,
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// rectangle height of one, and the y position for the first scan:
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IO_FIFO_WAIT(ppdev, 5);
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IO_CUR_Y(ppdev, yTrapezoid);
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IO_FRGD_COLOR(ppdev, (INT) iSolidColor);
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IO_FRGD_MIX(ppdev, FOREGROUND_COLOR | (WORD) ulHwMix);
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IO_PIX_CNTL(ppdev, ALL_ONES);
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IO_MIN_AXIS_PCNT(ppdev, 0);
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// Make sure we initialize the DDAs appropriately:
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aed[LEFT].cy = 0;
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aed[RIGHT].cy = 0;
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// For now, guess as to which is the left and which is the right edge:
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aed[LEFT].dptfx = -(LONG) sizeof(POINTFIX);
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aed[RIGHT].dptfx = sizeof(POINTFIX);
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aed[LEFT].pptfx = pptfxTop;
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aed[RIGHT].pptfx = pptfxTop;
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NextEdge:
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// We loop through this routine on a per-trapezoid basis.
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for (iEdge = 1; iEdge >= 0; iEdge--)
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{
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ped = &aed[iEdge];
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if (ped->cy == 0)
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{
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// Need a new DDA:
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do {
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cEdges--;
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if (cEdges < 0)
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return(TRUE);
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// Find the next left edge, accounting for wrapping:
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pptfxOld = ped->pptfx;
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ped->pptfx = (POINTFIX*) ((BYTE*) ped->pptfx + ped->dptfx);
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if (ped->pptfx < pptfxFirst)
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ped->pptfx = pptfxLast;
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else if (ped->pptfx > pptfxLast)
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ped->pptfx = pptfxFirst;
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// Have to find the edge that spans yTrapezoid:
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ped->cy = ((ped->pptfx->y + 15) >> 4) - yTrapezoid;
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// With fractional coordinate end points, we may get edges
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// that don't cross any scans, in which case we try the
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// next one:
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} while (ped->cy <= 0);
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// 'pptfx' now points to the end point of the edge spanning
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// the scan 'yTrapezoid'.
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dN = ped->pptfx->y - pptfxOld->y;
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dM = ped->pptfx->x - pptfxOld->x;
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ASSERTDD(dN > 0, "Should be going down only");
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// Compute the DDA increment terms:
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if (dM < 0)
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{
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dM = -dM;
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if (dM < dN) // Can't be '<='
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{
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ped->dx = -1;
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ped->lErrorUp = dN - dM;
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}
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else
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{
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QUOTIENT_REMAINDER(dM, dN, lQuotient, lRemainder);
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ped->dx = -lQuotient; // - dM / dN
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ped->lErrorUp = lRemainder; // dM % dN
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if (ped->lErrorUp > 0)
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{
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ped->dx--;
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ped->lErrorUp = dN - ped->lErrorUp;
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}
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}
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}
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else
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{
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if (dM < dN) // Can't be '<='
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{
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ped->dx = 0;
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ped->lErrorUp = dM;
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}
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else
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{
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QUOTIENT_REMAINDER(dM, dN, lQuotient, lRemainder);
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ped->dx = lQuotient; // dM / dN
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ped->lErrorUp = lRemainder; // dM % dN
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}
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}
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ped->lErrorDown = dN; // DDA limit
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ped->lError = -1; // Error is initially zero (add dN - 1 for
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// the ceiling, but subtract off dN so that
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// we can check the sign instead of comparing
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// to dN)
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ped->x = pptfxOld->x;
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yStart = pptfxOld->y;
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if ((yStart & 15) != 0)
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{
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// Advance to the next integer y coordinate
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for (i = 16 - (yStart & 15); i != 0; i--)
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{
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ped->x += ped->dx;
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ped->lError += ped->lErrorUp;
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if (ped->lError >= 0)
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{
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ped->lError -= ped->lErrorDown;
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ped->x++;
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}
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}
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}
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if ((ped->x & 15) != 0)
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{
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ped->lError -= ped->lErrorDown * (16 - (ped->x & 15));
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ped->x += 15; // We'll want the ceiling in just a bit...
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}
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// Chop off those fractional bits:
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ped->x >>= 4;
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ped->lError >>= 4;
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}
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}
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cyTrapezoid = min(aed[LEFT].cy, aed[RIGHT].cy); // # of scans in this trap
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aed[LEFT].cy -= cyTrapezoid;
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aed[RIGHT].cy -= cyTrapezoid;
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yTrapezoid += cyTrapezoid; // Top scan in next trap
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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 (((aed[LEFT].lErrorUp | aed[RIGHT].lErrorUp) == 0) &&
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((aed[LEFT].dx | aed[RIGHT].dx) == 0) &&
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(cyTrapezoid > 1))
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{
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LONG lWidth;
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ContinueVertical:
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lWidth = aed[RIGHT].x - aed[LEFT].x - 1;
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if (lWidth >= 0)
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{
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IO_FIFO_WAIT(ppdev, 5);
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IO_MAJ_AXIS_PCNT(ppdev, lWidth);
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IO_MIN_AXIS_PCNT(ppdev, cyTrapezoid - 1);
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IO_CUR_X(ppdev, aed[LEFT].x);
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IO_CMD(ppdev, RECTANGLE_FILL | DRAWING_DIR_TBLRXM |
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DRAW | DIR_TYPE_XY |
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LAST_PIXEL_ON | MULTIPLE_PIXELS |
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WRITE);
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IO_MIN_AXIS_PCNT(ppdev, 0);
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}
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else if (lWidth == -1)
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{
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// If the rectangle was too thin to light any pels, we still
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// have to advance the y current position:
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IO_FIFO_WAIT(ppdev, 1);
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IO_CUR_Y(ppdev, yTrapezoid - cyTrapezoid + 1);
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}
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else
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{
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LONG lTmp;
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POINTFIX* pptfxTmp;
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SWAP(aed[LEFT].x, aed[RIGHT].x, lTmp);
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SWAP(aed[LEFT].cy, aed[RIGHT].cy, lTmp);
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SWAP(aed[LEFT].dptfx, aed[RIGHT].dptfx, lTmp);
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SWAP(aed[LEFT].pptfx, aed[RIGHT].pptfx, pptfxTmp);
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goto ContinueVertical;
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}
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goto NextEdge;
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}
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while (TRUE)
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{
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LONG lWidth;
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// The very first time through, make sure we set x:
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lWidth = aed[RIGHT].x - aed[LEFT].x - 1;
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if (lWidth >= 0)
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{
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IO_FIFO_WAIT(ppdev, 3);
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IO_MAJ_AXIS_PCNT(ppdev, lWidth);
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IO_CUR_X(ppdev, aed[LEFT].x);
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IO_CMD(ppdev, RECTANGLE_FILL | DRAWING_DIR_TBLRXM |
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DRAW | DIR_TYPE_XY |
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LAST_PIXEL_ON | MULTIPLE_PIXELS |
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WRITE);
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ContinueAfterZero:
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// Advance the right wall:
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aed[RIGHT].x += aed[RIGHT].dx;
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aed[RIGHT].lError += aed[RIGHT].lErrorUp;
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if (aed[RIGHT].lError >= 0)
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{
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aed[RIGHT].lError -= aed[RIGHT].lErrorDown;
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aed[RIGHT].x++;
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}
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// Advance the left wall:
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aed[LEFT].x += aed[LEFT].dx;
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aed[LEFT].lError += aed[LEFT].lErrorUp;
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if (aed[LEFT].lError >= 0)
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{
|
||
|
|
aed[LEFT].lError -= aed[LEFT].lErrorDown;
|
||
|
|
aed[LEFT].x++;
|
||
|
|
}
|
||
|
|
|
||
|
|
cyTrapezoid--;
|
||
|
|
if (cyTrapezoid == 0)
|
||
|
|
goto NextEdge;
|
||
|
|
}
|
||
|
|
else if (lWidth == -1)
|
||
|
|
{
|
||
|
|
IO_FIFO_WAIT(ppdev, 1);
|
||
|
|
IO_CUR_Y(ppdev, yTrapezoid - cyTrapezoid + 1);
|
||
|
|
goto ContinueAfterZero;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// We certainly don't want to optimize for this case because we
|
||
|
|
// should rarely get self-intersecting polygons (if we're slow,
|
||
|
|
// the app gets what it deserves):
|
||
|
|
|
||
|
|
LONG lTmp;
|
||
|
|
POINTFIX* pptfxTmp;
|
||
|
|
|
||
|
|
SWAP(aed[LEFT].x, aed[RIGHT].x, lTmp);
|
||
|
|
SWAP(aed[LEFT].dx, aed[RIGHT].dx, lTmp);
|
||
|
|
SWAP(aed[LEFT].lError, aed[RIGHT].lError, lTmp);
|
||
|
|
SWAP(aed[LEFT].lErrorUp, aed[RIGHT].lErrorUp, lTmp);
|
||
|
|
SWAP(aed[LEFT].lErrorDown, aed[RIGHT].lErrorDown, lTmp);
|
||
|
|
SWAP(aed[LEFT].cy, aed[RIGHT].cy, lTmp);
|
||
|
|
SWAP(aed[LEFT].dptfx, aed[RIGHT].dptfx, lTmp);
|
||
|
|
SWAP(aed[LEFT].pptfx, aed[RIGHT].pptfx, pptfxTmp);
|
||
|
|
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|