IABSD.fr/xenocara/xserver/mi/miwideline.h

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• Author : matthieu
  Date : 2015-09-16 19:10:19
  Hash : 86ea9f12
  Message : Update to xserver 1.17.2. tested by dcoppa@, jsg@, jasper@ & naddy@

• xserver/mi/miwideline.h

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