dibcall.c

/*****************************************************************************

Copyright (c) 2022  Michal Necasek

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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*****************************************************************************/


#include "winhack.h"
#include <gdidefs.h>
#include <dibeng.h>
#include "minidrv.h"

/*
 * What's this all about? Most of the required exported driver functions can
 * be passed straight to the DIB Engine. The DIB Engine in some cases requires
 * an additional parameter.
 *
 * See the dibthunk.asm module for functions that can be handled easily. Note
 * that although the logic could be implemented in C, it can be done more
 * efficiently in assembly. Forwarders turn into simple jumps, and functions
 * with an extra parameter can be implemented with very small overhead, saving
 * stack space and extra copying.
 *
 * This module deals with the very few functions that need additional logic but
 * are not hardware specific.
 */


/* Exported as DISPLAY.104 */
void WINAPI __loadds CheckCursor( void )
{
    if( wEnabled ) {
        DIB_CheckCursorExt( lpDriverPDevice );
    }
}

/* If there is no hardware screen-to-screen BitBlt, there's no point in
 * this and we can just forward BitBlt to the DIB Engine.
 */
#ifdef HWBLT

extern BOOL WINAPI (* BitBltDevProc)( LPDIBENGINE, WORD, WORD, LPPDEVICE, WORD, WORD,
                                      WORD, WORD, DWORD, LPBRUSH, LPDRAWMODE );

/* See if a hardware BitBlt can be done. */
BOOL WINAPI BitBlt( LPDIBENGINE lpDestDev, WORD wDestX, WORD wDestY, LPPDEVICE lpSrcDev,
                    WORD wSrcX, WORD wSrcY, WORD wXext, WORD wYext, DWORD dwRop3,
                    LPBRUSH lpPBrush, LPDRAWMODE lpDrawMode )
{
    WORD    dstFlags = lpDestDev->deFlags;

    /* The destination must be video memory and not busy. */
    if( (dstFlags & VRAM) && !(dstFlags & BUSY) ) {
        /* If palette translation is needed, only proceed if source
         * and destination device are identical.
         */
        if( !(dstFlags & PALETTE_XLAT) || (lpDestDev == lpSrcDev) ) {
            /* If there is a hardware acceleration callback, use it. */
            if( BitBltDevProc ) {
                return( BitBltDevProc( lpDestDev, wDestX, wDestY, lpSrcDev, wSrcX, wSrcY, wXext, wYext, dwRop3, lpPBrush, lpDrawMode ) );
            }
        }
    }
    return( DIB_BitBlt( lpDestDev, wDestX, wDestY, lpSrcDev, wSrcX, wSrcY, wXext, wYext, dwRop3, lpPBrush, lpDrawMode ) );
}

#endif