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