graphics/dispdib.c

   1 /*
   2  * DISPDIB.dll
   3  *
   4  * Copyright 1998 Ove Kåven (with some help from Marcus Meissner)
   5  *
   6  */
   7
   8 #include <string.h>
   9 #include "miscemu.h"
  10 #include "dispdib.h"
  11 #include "vga.h"
  12 #include "debug.h"
  13
  14 DEFAULT_DEBUG_CHANNEL(ddraw)
  15
  16 static int dispdib_multi = 0;
  17
  18 static WORD DISPDIB_Begin(WORD wFlags)
  19 {
  20     unsigned Xres,Yres,Depth;
  21
  22     switch(wFlags&DISPLAYDIB_MODE) {
  23         case DISPLAYDIB_MODE_DEFAULT:
  24             /* FIXME: is this supposed to autodetect? */
  25         case DISPLAYDIB_MODE_320x200x8:
  26             Xres=320; Yres=200; Depth=8; break;
  27         case DISPLAYDIB_MODE_320x240x8:
  28             Xres=320; Yres=240; Depth=8; break;
  29         default:
  30             return DISPLAYDIB_NOTSUPPORTED;
  31     }
  32     /* more or less dummy calls to Death/Resurrection, for completeness */
  33     /* FIXME: what arguments should they get? */
  34     Death16(0);
  35     if (VGA_SetMode(Xres,Yres,Depth)) {
  36          Resurrection16(0,0,0,0,0,0,0);
  37          return DISPLAYDIB_NOTSUPPORTED;
  38     }
  39     return DISPLAYDIB_NOERROR;
  40 }
  41
  42 static void DISPDIB_End(void)
  43 {
  44     Resurrection16(0,0,0,0,0,0,0); /* FIXME: arguments */
  45     VGA_Exit();
  46 }
  47
  48 static void DISPDIB_Palette(LPBITMAPINFO lpbi)
  49 {
  50     VGA_SetQuadPalette(lpbi->bmiColors,0,256);
  51 }
  52
  53 static void DISPDIB_Show(LPBITMAPINFOHEADER lpbi,LPSTR lpBits,WORD uFlags)
  54 {
  55     int Xofs,Yofs,Width=lpbi->biWidth,Height=lpbi->biHeight,Delta;
  56     unsigned Pitch=(Width+3)&~3,sPitch,sWidth,sHeight;
  57     LPSTR surf = DOSMEM_MapDosToLinear(0xa0000);
  58
  59     if (VGA_GetMode(&sHeight,&sWidth,NULL)) return;
  60     sPitch=320;
  61
  62     Delta=(Height<0)*2-1;
  63     Height*=-Delta; Pitch*=Delta;
  64
  65     if (uFlags&DISPLAYDIB_NOCENTER) {
  66         Xofs=0; Yofs=0;
  67     } else {
  68         Xofs=(sWidth-Width)/2;
  69         Yofs=(sHeight-Height)/2;
  70     }
  71     surf += (Yofs*sPitch)+Xofs;
  72     if (Pitch<0) lpBits-=Pitch*(Height-1);
  73     for (; Height; Height--,lpBits+=Pitch,surf+=sPitch) {
  74         memcpy(surf,lpBits,Width);
  75     }
  76
  77     VGA_Poll(0);
  78 }
  79
  80 /*********************************************************************
  81  *      DisplayDib      (DISPDIB.1)
  82  *
  83  *  Disables GDI and takes over the VGA screen to show DIBs in full screen.
  84  *
  85  * FLAGS
  86  *
  87  *  DISPLAYDIB_NOPALETTE: don't change palette
  88  *  DISPLAYDIB_NOCENTER: don't center bitmap
  89  *  DISPLAYDIB_NOWAIT: don't wait (for keypress) before returning
  90  *  DISPLAYDIB_BEGIN: start of multiple calls (does not restore the screen)
  91  *  DISPLAYDIB_END: end of multiple calls (restores the screen)
  92  *  DISPLAYDIB_MODE_DEFAULT: default display mode
  93  *  DISPLAYDIB_MODE_320x200x8: Standard VGA 320x200 256 colors
  94  *  DISPLAYDIB_MODE_320x240x8: Tweaked VGA 320x240 256 colors
  95  *
  96  * RETURNS
  97  *
  98  *  DISPLAYDIB_NOERROR: success
  99  *  DISPLAYDIB_NOTSUPPORTED: function not supported
 100  *  DISPLAYDIB_INVALIDDIB: null or invalid DIB header
 101  *  DISPLAYDIB_INVALIDFORMAT: invalid DIB format
 102  *  DISPLAYDIB_INVALIDTASK: not called from current task
 103  *
 104  * BUGS
 105  *
 106  *  Waiting for keypresses is not implemented.
 107  */
 108 WORD WINAPI DisplayDib(
 109                 LPBITMAPINFO lpbi, /* DIB header with resolution and palette */
 110                 LPSTR lpBits, /* Bitmap bits to show */
 111                 WORD wFlags
 112         )
 113 {
 114     WORD ret;
 115
 116     if (wFlags&DISPLAYDIB_END) {
 117         if (dispdib_multi) DISPDIB_End();
 118         dispdib_multi = 0;
 119         return DISPLAYDIB_NOERROR;
 120     }
 121     if (!dispdib_multi) {
 122         ret=DISPDIB_Begin(wFlags);
 123         if (ret) return ret;
 124     }
 125     if (wFlags&DISPLAYDIB_BEGIN) dispdib_multi = 1;
 126     if (!(wFlags&DISPLAYDIB_NOPALETTE)) {
 127         DISPDIB_Palette(lpbi);
 128     }
 129     /* FIXME: not sure if it's valid to draw images in DISPLAYDIB_BEGIN, so... */
 130     if (lpBits) {
 131         DISPDIB_Show(&(lpbi->bmiHeader),lpBits,wFlags);
 132     }
 133     if (!(wFlags&DISPLAYDIB_NOWAIT)) {
 134         FIXME(ddraw,"wait not implemented\n");
 135     }
 136     if (!dispdib_multi) DISPDIB_End();
 137     return DISPLAYDIB_NOERROR;
 138 }