IABSD.fr/xenocara/xserver/fb/fbtile.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/fb/fbtile.c

• /*
   * Copyright © 1998 Keith Packard
   *
   * 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 "fb.h"
  
  /*
   * Accelerated tile fill -- tile width is a power of two not greater
   * than FB_UNIT
   */
  
  void
  fbEvenTile(FbBits * dst,
             FbStride dstStride,
             int dstX,
             int width,
             int height,
             FbBits * tile,
             FbStride tileStride,
             int tileHeight, int alu, FbBits pm, int xRot, int yRot)
  {
      FbBits *t, *tileEnd, bits;
      FbBits startmask, endmask;
      FbBits and, xor;
      int n, nmiddle;
      int tileX, tileY;
      int rot;
      int startbyte, endbyte;
  
      dst += dstX >> FB_SHIFT;
      dstX &= FB_MASK;
      FbMaskBitsBytes(dstX, width, FbDestInvarientRop(alu, pm),
                      startmask, startbyte, nmiddle, endmask, endbyte);
      if (startmask)
          dstStride--;
      dstStride -= nmiddle;
  
      /*
       * Compute tile start scanline and rotation parameters
       */
      tileEnd = tile + tileHeight * tileStride;
      modulus(-yRot, tileHeight, tileY);
      t = tile + tileY * tileStride;
      modulus(-xRot, FB_UNIT, tileX);
      rot = tileX;
  
      while (height--) {
  
          /*
           * Pick up bits for this scanline
           */
          bits = READ(t);
          t += tileStride;
          if (t >= tileEnd)
              t = tile;
          bits = FbRotLeft(bits, rot);
          and = fbAnd(alu, bits, pm);
          xor = fbXor(alu, bits, pm);
  
          if (startmask) {
              FbDoLeftMaskByteRRop(dst, startbyte, startmask, and, xor);
              dst++;
          }
          n = nmiddle;
          if (!and)
              while (n--)
                  WRITE(dst++, xor);
          else
              while (n--) {
                  WRITE(dst, FbDoRRop(READ(dst), and, xor));
                  dst++;
              }
          if (endmask)
              FbDoRightMaskByteRRop(dst, endbyte, endmask, and, xor);
          dst += dstStride;
      }
  }
  
  void
  fbOddTile(FbBits * dst,
            FbStride dstStride,
            int dstX,
            int width,
            int height,
            FbBits * tile,
            FbStride tileStride,
            int tileWidth,
            int tileHeight, int alu, FbBits pm, int bpp, int xRot, int yRot)
  {
      int tileX, tileY;
      int widthTmp;
      int h, w;
      int x, y;
  
      modulus(-yRot, tileHeight, tileY);
      y = 0;
      while (height) {
          h = tileHeight - tileY;
          if (h > height)
              h = height;
          height -= h;
          widthTmp = width;
          x = dstX;
          modulus(dstX - xRot, tileWidth, tileX);
          while (widthTmp) {
              w = tileWidth - tileX;
              if (w > widthTmp)
                  w = widthTmp;
              widthTmp -= w;
              fbBlt(tile + tileY * tileStride,
                    tileStride,
                    tileX,
                    dst + y * dstStride,
                    dstStride, x, w, h, alu, pm, bpp, FALSE, FALSE);
              x += w;
              tileX = 0;
          }
          y += h;
          tileY = 0;
      }
  }
  
  void
  fbTile(FbBits * dst,
         FbStride dstStride,
         int dstX,
         int width,
         int height,
         FbBits * tile,
         FbStride tileStride,
         int tileWidth,
         int tileHeight, int alu, FbBits pm, int bpp, int xRot, int yRot)
  {
      if (FbEvenTile(tileWidth))
          fbEvenTile(dst, dstStride, dstX, width, height,
                     tile, tileStride, tileHeight, alu, pm, xRot, yRot);
      else
          fbOddTile(dst, dstStride, dstX, width, height,
                    tile, tileStride, tileWidth, tileHeight,
                    alu, pm, bpp, xRot, yRot);
  }