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674 lines
16 KiB
C
674 lines
16 KiB
C
/*
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* ReactOS W32 Subsystem
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* $Id$
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* PURPOSE: Various Polygon Filling routines for Polygon()
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* FILE: subsys/win32k/objects/polyfill.c
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* PROGRAMER: Mark Tempel
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* REVISION HISTORY:
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* 21/2/2003: Created
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*/
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#include <w32k.h>
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#define NDEBUG
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#include <debug.h>
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INT __cdecl abs(INT nm);
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#define FILL_EDGE_ALLOC_TAG 0x45465044
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/*
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** This struct is used for book keeping during polygon filling routines.
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*/
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typedef struct _tagFILL_EDGE
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{
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/*Basic line information*/
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int FromX;
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int FromY;
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int ToX;
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int ToY;
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int dx;
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int dy;
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int absdx, absdy;
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int x, y;
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int xmajor;
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/*Active Edge List information*/
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int XIntercept[2];
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int Error;
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int ErrorMax;
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int XDirection, YDirection;
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/* The next edge in the active Edge List*/
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struct _tagFILL_EDGE * pNext;
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} FILL_EDGE;
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typedef struct _FILL_EDGE_LIST
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{
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int Count;
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FILL_EDGE** Edges;
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} FILL_EDGE_LIST;
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#if 0
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static
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void
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DEBUG_PRINT_ACTIVE_EDGELIST ( FILL_EDGE* list )
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{
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FILL_EDGE* pThis = list;
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if (0 == list)
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{
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DPRINT1("List is NULL\n");
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return;
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}
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while(0 != pThis)
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{
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//DPRINT1("EDGE: (%d, %d) to (%d, %d)\n", pThis->FromX, pThis->FromY, pThis->ToX, pThis->ToY);
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DPRINT1("EDGE: [%d,%d]\n", pThis->XIntercept[0], pThis->XIntercept[1] );
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pThis = pThis->pNext;
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}
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}
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#else
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#define DEBUG_PRINT_ACTIVE_EDGELIST(x)
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#endif
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/*
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** Hide memory clean up.
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*/
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static
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void
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FASTCALL
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POLYGONFILL_DestroyEdgeList(FILL_EDGE_LIST* list)
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{
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int i;
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if ( list )
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{
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if ( list->Edges )
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{
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for ( i = 0; i < list->Count; i++ )
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{
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if ( list->Edges[i] )
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EngFreeMem ( list->Edges[i] );
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}
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EngFreeMem ( list->Edges );
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}
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EngFreeMem ( list );
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}
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}
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/*
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** This makes and initiaizes an Edge struct for a line between two points.
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*/
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static
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FILL_EDGE*
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FASTCALL
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POLYGONFILL_MakeEdge(POINT From, POINT To)
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{
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FILL_EDGE* rc = (FILL_EDGE*)EngAllocMem(FL_ZERO_MEMORY, sizeof(FILL_EDGE), FILL_EDGE_ALLOC_TAG);
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if (0 == rc)
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return NULL;
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//DPRINT1("Making Edge: (%d, %d) to (%d, %d)\n", From.x, From.y, To.x, To.y);
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//Now Fill the struct.
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if ( To.y < From.y )
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{
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rc->FromX = To.x;
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rc->FromY = To.y;
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rc->ToX = From.x;
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rc->ToY = From.y;
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rc->YDirection = -1;
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// lines that go up get walked backwards, so need to be offset
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// by -1 in order to make the walk identically on a pixel-level
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rc->Error = -1;
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}
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else
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{
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rc->FromX = From.x;
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rc->FromY = From.y;
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rc->ToX = To.x;
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rc->ToY = To.y;
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rc->YDirection = 1;
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rc->Error = 0;
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}
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rc->x = rc->FromX;
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rc->y = rc->FromY;
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rc->dx = rc->ToX - rc->FromX;
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rc->dy = rc->ToY - rc->FromY;
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rc->absdx = abs(rc->dx);
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rc->absdy = abs(rc->dy);
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rc->xmajor = rc->absdx > rc->absdy;
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rc->ErrorMax = max(rc->absdx,rc->absdy);
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rc->Error += rc->ErrorMax / 2;
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rc->XDirection = (rc->dx < 0)?(-1):(1);
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rc->pNext = 0;
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//DPRINT("MakeEdge (%i,%i)->(%i,%i) d=(%i,%i) dir=(%i,%i) err=%i max=%i\n",
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// From.x, From.y, To.x, To.y, rc->dx, rc->dy, rc->XDirection, rc->YDirection, rc->Error, rc->ErrorMax );
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return rc;
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}
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/*
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** My Edge comparison routine.
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** This is for scan converting polygon fill.
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** First sort by MinY, then Minx, then slope.
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**
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** This comparison will help us determine which
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** lines will become active first when scanning from
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** top (min y) to bottom (max y).
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**
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** Return Value Meaning
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** Negative integer element1 < element2
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** Zero element1 = element2
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** Positive integer element1 > element2
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*/
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static
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INT
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FASTCALL
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FILL_EDGE_Compare(FILL_EDGE* Edge1, FILL_EDGE* Edge2)
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{
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int e1 = Edge1->XIntercept[0] + Edge1->XIntercept[1];
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int e2 = Edge2->XIntercept[0] + Edge2->XIntercept[1];
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return e1 - e2;
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}
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/*
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** Insert an edge into a list keeping the list in order.
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*/
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static
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void
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FASTCALL
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POLYGONFILL_ActiveListInsert(FILL_EDGE** activehead, FILL_EDGE* NewEdge )
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{
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FILL_EDGE *pPrev, *pThis;
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//DPRINT1("In POLYGONFILL_ActiveListInsert()\n");
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ASSERT ( activehead && NewEdge );
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if ( !*activehead )
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{
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NewEdge->pNext = NULL;
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*activehead = NewEdge;
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return;
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}
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/*
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** First lets check to see if we have a new smallest value.
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*/
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if (FILL_EDGE_Compare(NewEdge, *activehead) <= 0)
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{
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NewEdge->pNext = *activehead;
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*activehead = NewEdge;
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return;
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}
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/*
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** Ok, now scan to the next spot to put this item.
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*/
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pThis = *activehead;
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pPrev = NULL;
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while ( pThis && FILL_EDGE_Compare(pThis, NewEdge) < 0 )
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{
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pPrev = pThis;
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pThis = pThis->pNext;
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}
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ASSERT(pPrev);
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NewEdge->pNext = pPrev->pNext;
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pPrev->pNext = NewEdge;
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//DEBUG_PRINT_ACTIVE_EDGELIST(*activehead);
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}
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/*
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** Create a list of edges for a list of points.
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*/
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static
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FILL_EDGE_LIST*
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FASTCALL
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POLYGONFILL_MakeEdgeList(PPOINT Points, int Count)
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{
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int CurPt = 0;
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FILL_EDGE_LIST* list = 0;
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FILL_EDGE* e = 0;
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if ( 0 == Points || 2 > Count )
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return 0;
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list = (FILL_EDGE_LIST*)EngAllocMem(FL_ZERO_MEMORY, sizeof(FILL_EDGE_LIST), FILL_EDGE_ALLOC_TAG);
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if ( 0 == list )
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goto fail;
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list->Count = 0;
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list->Edges = (FILL_EDGE**)EngAllocMem(FL_ZERO_MEMORY, Count*sizeof(FILL_EDGE*), FILL_EDGE_ALLOC_TAG);
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if ( !list->Edges )
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goto fail;
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memset ( list->Edges, 0, Count * sizeof(FILL_EDGE*) );
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for ( CurPt = 1; CurPt < Count; ++CurPt )
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{
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e = POLYGONFILL_MakeEdge ( Points[CurPt-1], Points[CurPt] );
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if ( !e )
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goto fail;
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// if a straight horizontal line - who cares?
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if ( !e->absdy )
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EngFreeMem ( e );
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else
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list->Edges[list->Count++] = e;
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}
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e = POLYGONFILL_MakeEdge ( Points[CurPt-1], Points[0] );
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if ( !e )
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goto fail;
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if ( !e->absdy )
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EngFreeMem ( e );
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else
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list->Edges[list->Count++] = e;
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return list;
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fail:
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DPRINT1("Out Of MEMORY!!\n");
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POLYGONFILL_DestroyEdgeList ( list );
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return 0;
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}
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/*
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** This slow routine uses the data stored in the edge list to
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** calculate the x intercepts for each line in the edge list
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** for scanline Scanline.
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**TODO: Get rid of this floating point arithmetic
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*/
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static
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void
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FASTCALL
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POLYGONFILL_UpdateScanline(FILL_EDGE* pEdge, int Scanline)
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{
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if ( 0 == pEdge->dy )
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return;
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ASSERT ( pEdge->FromY <= Scanline && pEdge->ToY > Scanline );
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if ( pEdge->xmajor )
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{
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int steps;
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ASSERT ( pEdge->y == Scanline );
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// now shoot to end of scanline collision
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steps = (pEdge->ErrorMax-pEdge->Error-1)/pEdge->absdy;
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if ( steps )
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{
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// record first collision with scanline
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int x1 = pEdge->x;
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pEdge->x += steps * pEdge->XDirection;
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pEdge->Error += steps * pEdge->absdy;
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ASSERT ( pEdge->Error < pEdge->ErrorMax );
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pEdge->XIntercept[0] = min(x1,pEdge->x);
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pEdge->XIntercept[1] = max(x1,pEdge->x);
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}
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else
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{
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pEdge->XIntercept[0] = pEdge->x;
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pEdge->XIntercept[1] = pEdge->x;
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}
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// we should require exactly 1 step to step onto next scanline...
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ASSERT ( (pEdge->ErrorMax-pEdge->Error-1) / pEdge->absdy == 0 );
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pEdge->x += pEdge->XDirection;
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pEdge->Error += pEdge->absdy;
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ASSERT ( pEdge->Error >= pEdge->ErrorMax );
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// now step onto next scanline...
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pEdge->Error -= pEdge->absdx;
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pEdge->y++;
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}
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else // then this is a y-major line
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{
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pEdge->XIntercept[0] = pEdge->x;
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pEdge->XIntercept[1] = pEdge->x;
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pEdge->Error += pEdge->absdx;
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pEdge->y++;
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if ( pEdge->Error >= pEdge->ErrorMax )
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{
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pEdge->Error -= pEdge->ErrorMax;
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pEdge->x += pEdge->XDirection;
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ASSERT ( pEdge->Error < pEdge->ErrorMax );
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}
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}
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//DPRINT("Line (%d, %d) to (%d, %d) intersects scanline %d at (%d,%d)\n",
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// pEdge->FromX, pEdge->FromY, pEdge->ToX, pEdge->ToY, Scanline, pEdge->XIntercept[0], pEdge->XIntercept[1] );
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}
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/*
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** This method updates the Active edge collection for the scanline Scanline.
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*/
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static
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void
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APIENTRY
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POLYGONFILL_BuildActiveList ( int Scanline, FILL_EDGE_LIST* list, FILL_EDGE** ActiveHead )
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{
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int i;
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ASSERT ( list && ActiveHead );
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*ActiveHead = 0;
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for ( i = 0; i < list->Count; i++ )
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{
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FILL_EDGE* pEdge = list->Edges[i];
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ASSERT(pEdge);
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if ( pEdge->FromY <= Scanline && pEdge->ToY > Scanline )
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{
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POLYGONFILL_UpdateScanline ( pEdge, Scanline );
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POLYGONFILL_ActiveListInsert ( ActiveHead, pEdge );
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}
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}
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}
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/*
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** This method fills the portion of the polygon that intersects with the scanline
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** Scanline.
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*/
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static
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void
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APIENTRY
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POLYGONFILL_FillScanLineAlternate(
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PDC dc,
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int ScanLine,
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FILL_EDGE* ActiveHead,
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SURFACE *psurf,
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BRUSHOBJ *BrushObj,
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MIX RopMode )
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{
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FILL_EDGE *pLeft, *pRight;
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if ( !ActiveHead )
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return;
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pLeft = ActiveHead;
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pRight = pLeft->pNext;
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ASSERT(pRight);
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while ( NULL != pRight )
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{
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int x1 = pLeft->XIntercept[0];
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int x2 = pRight->XIntercept[1];
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if ( x2 > x1 )
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{
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RECTL BoundRect;
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BoundRect.top = ScanLine;
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BoundRect.bottom = ScanLine + 1;
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BoundRect.left = x1;
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BoundRect.right = x2;
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//DPRINT("Fill Line (%d, %d) to (%d, %d)\n",x1, ScanLine, x2, ScanLine);
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IntEngLineTo(&psurf->SurfObj,
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dc->rosdc.CombinedClip,
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BrushObj,
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x1,
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ScanLine,
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x2,
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ScanLine,
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&BoundRect, // Bounding rectangle
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RopMode); // MIX
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}
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pLeft = pRight->pNext;
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pRight = pLeft ? pLeft->pNext : NULL;
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}
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}
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static
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void
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APIENTRY
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POLYGONFILL_FillScanLineWinding(
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PDC dc,
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int ScanLine,
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FILL_EDGE* ActiveHead,
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SURFACE *psurf,
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BRUSHOBJ *BrushObj,
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MIX RopMode )
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{
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FILL_EDGE *pLeft, *pRight;
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int x1, x2, winding = 0;
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RECTL BoundRect;
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if ( !ActiveHead )
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return;
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BoundRect.top = ScanLine;
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BoundRect.bottom = ScanLine + 1;
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pLeft = ActiveHead;
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winding = pLeft->YDirection;
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pRight = pLeft->pNext;
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ASSERT(pRight);
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// setup first line...
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x1 = pLeft->XIntercept[0];
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x2 = pRight->XIntercept[1];
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pLeft = pRight;
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pRight = pLeft->pNext;
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winding += pLeft->YDirection;
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while ( NULL != pRight )
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{
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int newx1 = pLeft->XIntercept[0];
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int newx2 = pRight->XIntercept[1];
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if ( winding )
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{
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// check and see if this new line touches the previous...
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if ( (newx1 >= x1 && newx1 <= x2)
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|| (newx2 >= x1 && newx2 <= x2)
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|| (x1 >= newx1 && x1 <= newx2)
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|| (x2 >= newx2 && x2 <= newx2)
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)
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{
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// yup, just tack it on to our existing line
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x1 = min(x1,newx1);
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x2 = max(x2,newx2);
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}
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else
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{
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// nope - render the old line..
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BoundRect.left = x1;
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BoundRect.right = x2;
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//DPRINT("Fill Line (%d, %d) to (%d, %d)\n",x1, ScanLine, x2, ScanLine);
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IntEngLineTo(&psurf->SurfObj,
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dc->rosdc.CombinedClip,
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BrushObj,
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x1,
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ScanLine,
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x2,
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ScanLine,
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&BoundRect, // Bounding rectangle
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RopMode); // MIX
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x1 = newx1;
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x2 = newx2;
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}
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}
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pLeft = pRight;
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pRight = pLeft->pNext;
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winding += pLeft->YDirection;
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}
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// there will always be a line left-over, render it now...
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BoundRect.left = x1;
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BoundRect.right = x2;
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//DPRINT("Fill Line (%d, %d) to (%d, %d)\n",x1, ScanLine, x2, ScanLine);
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IntEngLineTo(&psurf->SurfObj,
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dc->rosdc.CombinedClip,
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BrushObj,
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x1,
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ScanLine,
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x2,
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ScanLine,
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&BoundRect, // Bounding rectangle
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RopMode); // MIX
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}
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//When the fill mode is ALTERNATE, GDI fills the area between odd-numbered and
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//even-numbered polygon sides on each scan line. That is, GDI fills the area between the
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//first and second side, between the third and fourth side, and so on.
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//WINDING Selects winding mode (fills any region with a nonzero winding value).
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//When the fill mode is WINDING, GDI fills any region that has a nonzero winding value.
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//This value is defined as the number of times a pen used to draw the polygon would go around the region.
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//The direction of each edge of the polygon is important.
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BOOL
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APIENTRY
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FillPolygon(
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PDC dc,
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SURFACE *psurf,
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BRUSHOBJ *BrushObj,
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MIX RopMode,
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CONST PPOINT Points,
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int Count,
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RECTL BoundRect )
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{
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FILL_EDGE_LIST *list = 0;
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FILL_EDGE *ActiveHead = 0;
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int ScanLine;
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PDC_ATTR pdcattr = dc->pdcattr;
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void
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(APIENTRY *FillScanLine)(
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PDC dc,
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int ScanLine,
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FILL_EDGE* ActiveHead,
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SURFACE *psurf,
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BRUSHOBJ *BrushObj,
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MIX RopMode );
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|
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//DPRINT("FillPolygon\n");
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/* Create Edge List. */
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list = POLYGONFILL_MakeEdgeList(Points, Count);
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/* DEBUG_PRINT_EDGELIST(list); */
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if (NULL == list)
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return FALSE;
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if ( WINDING == pdcattr->jFillMode )
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FillScanLine = POLYGONFILL_FillScanLineWinding;
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else /* default */
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FillScanLine = POLYGONFILL_FillScanLineAlternate;
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/* For each Scanline from BoundRect.bottom to BoundRect.top,
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* determine line segments to draw
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*/
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for ( ScanLine = BoundRect.top; ScanLine < BoundRect.bottom; ++ScanLine )
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{
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POLYGONFILL_BuildActiveList(ScanLine, list, &ActiveHead);
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//DEBUG_PRINT_ACTIVE_EDGELIST(ActiveHead);
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FillScanLine ( dc, ScanLine, ActiveHead, psurf, BrushObj, RopMode );
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}
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/* Free Edge List. If any are left. */
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POLYGONFILL_DestroyEdgeList(list);
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|
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return TRUE;
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}
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|
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|
BOOL FASTCALL
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|
IntFillPolygon(
|
|
PDC dc,
|
|
SURFACE *psurf,
|
|
BRUSHOBJ *BrushObj,
|
|
CONST PPOINT Points,
|
|
int Count,
|
|
RECTL DestRect,
|
|
POINTL *BrushOrigin)
|
|
{
|
|
FILL_EDGE_LIST *list = 0;
|
|
FILL_EDGE *ActiveHead = 0;
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|
FILL_EDGE *pLeft, *pRight;
|
|
int ScanLine;
|
|
|
|
//DPRINT("IntFillPolygon\n");
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|
|
|
/* Create Edge List. */
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|
list = POLYGONFILL_MakeEdgeList(Points, Count);
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|
/* DEBUG_PRINT_EDGELIST(list); */
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if (NULL == list)
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return FALSE;
|
|
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|
/* For each Scanline from DestRect.top to DestRect.bottom, determine line segments to draw */
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|
for ( ScanLine = DestRect.top; ScanLine < DestRect.bottom; ++ScanLine )
|
|
{
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POLYGONFILL_BuildActiveList(ScanLine, list, &ActiveHead);
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|
//DEBUG_PRINT_ACTIVE_EDGELIST(ActiveHead);
|
|
|
|
if ( !ActiveHead )
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|
return FALSE;
|
|
|
|
pLeft = ActiveHead;
|
|
pRight = pLeft->pNext;
|
|
ASSERT(pRight);
|
|
|
|
while ( NULL != pRight )
|
|
{
|
|
int x1 = pLeft->XIntercept[0];
|
|
int x2 = pRight->XIntercept[1];
|
|
if ( x2 > x1 )
|
|
{
|
|
RECTL LineRect;
|
|
LineRect.top = ScanLine;
|
|
LineRect.bottom = ScanLine + 1;
|
|
LineRect.left = x1;
|
|
LineRect.right = x2;
|
|
|
|
IntEngBitBlt(&psurf->SurfObj,
|
|
NULL,
|
|
NULL,
|
|
dc->rosdc.CombinedClip,
|
|
NULL,
|
|
&LineRect,
|
|
NULL,
|
|
NULL,
|
|
BrushObj,
|
|
BrushOrigin,
|
|
ROP3_TO_ROP4(PATCOPY));
|
|
}
|
|
pLeft = pRight->pNext;
|
|
pRight = pLeft ? pLeft->pNext : NULL;
|
|
}
|
|
}
|
|
|
|
/* Free Edge List. If any are left. */
|
|
POLYGONFILL_DestroyEdgeList(list);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* EOF */
|