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