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fixed line back-tracking in Polygon to match forward-tracking. No overlap occurs between line and fill if pen width <= 1.

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svn path=/trunk/; revision=5606
This commit is contained in:
Royce Mitchell III 2003-08-16 21:17:20 +00:00
parent cc588fb0f4
commit 2ef7538593
2 changed files with 24 additions and 12 deletions
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18
reactos/apps/tests/polytest/polytest.cpp
View file

@ -268,6 +268,10 @@ POLYGONFILL_MakeEdge(POINT From, POINT To)
rc->ToX = From.x;
rc->ToY = From.y;
rc->YDirection = -1;
// lines that go up get walked backwards, so need to be offset
// by -1 in order to make the walk identically on a pixel-level
rc->Error = -1;
}
else
{
@ -276,6 +280,8 @@ POLYGONFILL_MakeEdge(POINT From, POINT To)
rc->ToX = To.x;
rc->ToY = To.y;
rc->YDirection = 1;
rc->Error = 0;
}
rc->x = rc->FromX;
@ -289,7 +295,7 @@ POLYGONFILL_MakeEdge(POINT From, POINT To)
rc->ErrorMax = MAX(rc->absdx,rc->absdy);
rc->Error = rc->ErrorMax / 2;
rc->Error += rc->ErrorMax / 2;
rc->XDirection = (rc->dx < 0)?(-1):(1);
@ -556,8 +562,8 @@ POLYGONFILL_FillScanLineAlternate(
while ( NULL != pRight )
{
int x1 = pLeft->XIntercept[1];
int x2 = pRight->XIntercept[0]+1;
int x1 = pLeft->XIntercept[1]+1;
int x2 = pRight->XIntercept[0];
if ( x2 > x1 )
{
RECTL BoundRect;
@ -606,8 +612,8 @@ POLYGONFILL_FillScanLineWinding(
while ( NULL != pRight )
{
int x1 = pLeft->XIntercept[1];
int x2 = pRight->XIntercept[0]+1;
int x1 = pLeft->XIntercept[1]+1;
int x2 = pRight->XIntercept[0];
if ( winding && x2 > x1 )
{
RECTL BoundRect;
@ -808,7 +814,7 @@ void main()
const int pts_count = sizeof(pts)/sizeof(pts[0]);
// use ALTERNATE or WINDING for 3rd param
Polygon ( pts, pts_count, ALTERNATE );
Polygon ( pts, pts_count, WINDING );
// print out our "screen"
for ( int y = 0; y < SCREENY; y++ )

18
reactos/subsys/win32k/objects/polyfill.c
View file

@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* $Id: polyfill.c,v 1.9 2003/08/16 05:12:37 royce Exp $
/* $Id: polyfill.c,v 1.10 2003/08/16 21:17:20 royce Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -145,6 +145,10 @@ POLYGONFILL_MakeEdge(POINT From, POINT To)
rc->ToX = From.x;
rc->ToY = From.y;
rc->YDirection = -1;
// lines that go up get walked backwards, so need to be offset
// by -1 in order to make the walk identically on a pixel-level
rc->Error = -1;
}
else
{
@ -153,6 +157,8 @@ POLYGONFILL_MakeEdge(POINT From, POINT To)
rc->ToX = To.x;
rc->ToY = To.y;
rc->YDirection = 1;
rc->Error = 0;
}
rc->x = rc->FromX;
@ -166,7 +172,7 @@ POLYGONFILL_MakeEdge(POINT From, POINT To)
rc->ErrorMax = MAX(rc->absdx,rc->absdy);
rc->Error = rc->ErrorMax / 2;
rc->Error += rc->ErrorMax / 2;
rc->XDirection = (rc->dx < 0)?(-1):(1);
@ -433,8 +439,8 @@ POLYGONFILL_FillScanLineAlternate(
while ( NULL != pRight )
{
int x1 = pLeft->XIntercept[1];
int x2 = pRight->XIntercept[0]+1;
int x1 = pLeft->XIntercept[1]+1;
int x2 = pRight->XIntercept[0];
if ( x2 > x1 )
{
RECTL BoundRect;
@ -483,8 +489,8 @@ POLYGONFILL_FillScanLineWinding(
while ( NULL != pRight )
{
int x1 = pLeft->XIntercept[1];
int x2 = pRight->XIntercept[0]+1;
int x1 = pLeft->XIntercept[1]+1;
int x2 = pRight->XIntercept[0];
if ( winding && x2 > x1 )
{
RECTL BoundRect;