94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
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Copyright 1988, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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*/
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/* Author: Keith Packard, MIT X Consortium */
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#include "mifpoly.h" /* for ICEIL */
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/*
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* Polygon edge description for integer wide-line routines
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*/
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typedef struct _PolyEdge {
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int height; /* number of scanlines to process */
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int x; /* starting x coordinate */
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int stepx; /* fixed integral dx */
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int signdx; /* variable dx sign */
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int e; /* initial error term */
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int dy;
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int dx;
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} PolyEdgeRec, *PolyEdgePtr;
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#define SQSECANT 108.856472512142 /* 1/sin^2(11/2) - miter limit constant */
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/*
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* types for general polygon routines
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*/
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typedef struct _PolyVertex {
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double x, y;
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} PolyVertexRec, *PolyVertexPtr;
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typedef struct _PolySlope {
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int dx, dy;
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double k; /* x0 * dy - y0 * dx */
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} PolySlopeRec, *PolySlopePtr;
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/*
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* Line face description for caps/joins
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*/
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typedef struct _LineFace {
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double xa, ya;
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int dx, dy;
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int x, y;
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double k;
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} LineFaceRec, *LineFacePtr;
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/*
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* macros for polygon fillers
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*/
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#define MILINESETPIXEL(pDrawable, pGC, pixel, oldPixel) { \
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oldPixel = pGC->fgPixel; \
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if (pixel != oldPixel) { \
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ChangeGCVal gcval; \
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gcval.val = pixel; \
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ChangeGC (NullClient, pGC, GCForeground, &gcval); \
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ValidateGC (pDrawable, pGC); \
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} \
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}
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#define MILINERESETPIXEL(pDrawable, pGC, pixel, oldPixel) { \
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if (pixel != oldPixel) { \
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ChangeGCVal gcval; \
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gcval.val = oldPixel; \
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ChangeGC (NullClient, pGC, GCForeground, &gcval); \
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ValidateGC (pDrawable, pGC); \
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} \
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}
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