IABSD.fr/xenocara/xserver/render/mitrap.c

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  Commit

• Author : matthieu
  Date : 2012-06-10 13:21:05
  Hash : e60da745
  Message : Update to xserver 1.12.2. tested by naddy@, krw@, mpi@.

• xserver/render/mitrap.c

• /*
   *
   * Copyright © 2002 Keith Packard, member of The XFree86 Project, Inc.
   *
   * 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, and that the name of Keith Packard not be used in
   * advertising or publicity pertaining to distribution of the software without
   * specific, written prior permission.  Keith Packard makes no
   * representations about the suitability of this software for any purpose.  It
   * is provided "as is" without express or implied warranty.
   *
   * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
   * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
   * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
   * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
   * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
   * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
   * PERFORMANCE OF THIS SOFTWARE.
   */
  
  #ifdef HAVE_DIX_CONFIG_H
  #include <dix-config.h>
  #endif
  
  #include "scrnintstr.h"
  #include "gcstruct.h"
  #include "pixmapstr.h"
  #include "windowstr.h"
  #include "servermd.h"
  #include "mi.h"
  #include "picturestr.h"
  #include "mipict.h"
  
  static xFixed
  miLineFixedX(xLineFixed * l, xFixed y, Bool ceil)
  {
      xFixed dx = l->p2.x - l->p1.x;
      xFixed_32_32 ex = (xFixed_32_32) (y - l->p1.y) * dx;
      xFixed dy = l->p2.y - l->p1.y;
  
      if (ceil)
          ex += (dy - 1);
      return l->p1.x + (xFixed) (ex / dy);
  }
  
  void
  miTrapezoidBounds(int ntrap, xTrapezoid * traps, BoxPtr box)
  {
      box->y1 = MAXSHORT;
      box->y2 = MINSHORT;
      box->x1 = MAXSHORT;
      box->x2 = MINSHORT;
      for (; ntrap; ntrap--, traps++) {
          INT16 x1, y1, x2, y2;
  
          if (!xTrapezoidValid(traps))
              continue;
          y1 = xFixedToInt(traps->top);
          if (y1 < box->y1)
              box->y1 = y1;
  
          y2 = xFixedToInt(xFixedCeil(traps->bottom));
          if (y2 > box->y2)
              box->y2 = y2;
  
          x1 = xFixedToInt(min(miLineFixedX(&traps->left, traps->top, FALSE),
                               miLineFixedX(&traps->left, traps->bottom, FALSE)));
          if (x1 < box->x1)
              box->x1 = x1;
  
          x2 = xFixedToInt(xFixedCeil
                           (max
                            (miLineFixedX(&traps->right, traps->top, TRUE),
                             miLineFixedX(&traps->right, traps->bottom, TRUE))));
          if (x2 > box->x2)
              box->x2 = x2;
      }
  }