src/add-ons/accelerants/3dfx/cursor.cpp

   1 /*
   2         Copyright 1999, Be Incorporated.   All Rights Reserved.
   3         This file may be used under the terms of the Be Sample Code License.
   4
   5         Other authors:
   6         Gerald Zajac 2007-2010
   7 */
   8
   9 #include "accelerant.h"
  10
  11
  12 status_t
  13 SetCursorShape(uint16 width, uint16 height, uint16 hot_x, uint16 hot_y,
  14                                 uint8* andMask, uint8* xorMask)
  15 {
  16         // NOTE: Currently, for BeOS, cursor width and height must be equal to 16.
  17
  18         if ((width != 16) || (height != 16)) {
  19                 return B_ERROR;
  20         } else if ((hot_x >= width) || (hot_y >= height)) {
  21                 return B_ERROR;
  22         } else {
  23                 // Update cursor variables appropriately.
  24
  25                 SharedInfo& si = *gInfo.sharedInfo;
  26                 si.cursorHotX = hot_x;
  27                 si.cursorHotY = hot_y;
  28
  29                 if ( ! TDFX_LoadCursorImage(width, height, andMask, xorMask))
  30                         return B_ERROR;
  31         }
  32
  33         return B_OK;
  34 }
  35
  36
  37 void
  38 MoveCursor(uint16 xPos, uint16 yPos)
  39 {
  40         // Move the cursor to the specified position on the desktop.  If we're
  41         // using some kind of virtual desktop, adjust the display start position
  42         // accordingly and position the cursor in the proper "virtual" location.
  43
  44         int x = xPos;           // use signed int's since chip specific functions
  45         int y = yPos;           // need signed int to determine if cursor off screen
  46
  47         SharedInfo& si = *gInfo.sharedInfo;
  48         DisplayModeEx& dm = si.displayMode;
  49
  50         uint16 hds = dm.h_display_start;        // current horizontal starting pixel
  51         uint16 vds = dm.v_display_start;        // current vertical starting line
  52
  53         // Clamp cursor to virtual display.
  54         if (x >= dm.virtual_width)
  55                 x = dm.virtual_width - 1;
  56         if (y >= dm.virtual_height)
  57                 y = dm.virtual_height - 1;
  58
  59         // Adjust h/v display start to move cursor onto screen.
  60         if (x >= (dm.timing.h_display + hds))
  61                 hds = x - dm.timing.h_display + 1;
  62         else if (x < hds)
  63                 hds = x;
  64
  65         if (y >= (dm.timing.v_display + vds))
  66                 vds = y - dm.timing.v_display + 1;
  67         else if (y < vds)
  68                 vds = y;
  69
  70         // Reposition the desktop on the display if required.
  71         if (hds != dm.h_display_start || vds != dm.v_display_start)
  72                 MoveDisplay(hds, vds);
  73
  74         // Put cursor in correct physical position.
  75         x -= (hds + si.cursorHotX);
  76         y -= (vds + si.cursorHotY);
  77
  78         // Position the cursor on the display.
  79         TDFX_SetCursorPosition(x, y);
  80 }
  81