157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
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/****************************************************************************
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DVA surface provider for Chicago DIBENG
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***************************************************************************/
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#include <windows.h>
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#include "dva.h"
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#include "dibeng.inc"
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#include "lockbm.h"
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#define RP_TYPE 0x5250 // 'RP'
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// stuff in DVAVGA.C
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extern HDC hdcScreen;
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extern BOOL FAR PASCAL _loadds vga_open_surface(LPVOID pv);
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extern void FAR PASCAL _loadds vga_close_surface(LPVOID pv);
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/****************************************************************************
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***************************************************************************/
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BOOL CALLBACK dib_open_surface(LPVOID pv)
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{
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return TRUE;
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}
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/****************************************************************************
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***************************************************************************/
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void CALLBACK dib_close_surface(LPVOID pv)
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{
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}
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/****************************************************************************
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***************************************************************************/
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BOOL CALLBACK dib_begin_access(LPVOID pv, int x, int y, int AccessDX, int AccessDY)
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{
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//
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// on some SVGAs with 8514 like accelerators, a command Que may need to
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// be flushed before touching video memory.
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//
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// mini drivers should not need this "handholding" but the S3 driver
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// does
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//
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// if (hdcScreen)
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// GetPixel(hdcScreen, x, y);
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_asm {
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push ds
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; push si
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; push di
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lds bx,pv
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xor ax,ax
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test [bx].deFlags,DISABLED
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jnz exit
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mov cx,x
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mov dx,y
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mov si,cx
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add si,AccessDX
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mov di,y
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add di,AccessDY
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call dword ptr [bx].deCursorExclude
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mov ax,1
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exit:
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; pop di
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; pop si
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pop ds
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}
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}
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/****************************************************************************
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***************************************************************************/
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void FAR PASCAL dib_end_access(LPVOID pv)
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{
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_asm {
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push ds
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lds bx,pv
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call dword ptr [bx].deCursorUnexclude
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pop ds
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}
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}
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/****************************************************************************
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***************************************************************************/
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BOOL dib_get_surface(HDC hdc, int nSurface, DVASURFACEINFO FAR *pdva)
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{
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DIBENGINE FAR *pde;
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LPBITMAPINFOHEADER lpbi;
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if (nSurface != 0)
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return FALSE;
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pde = (DIBENGINE FAR *)GetPDevice(hdc);
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if (pde == NULL ||
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pde->deType != RP_TYPE ||
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pde->dePlanes != 1 ||
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pde->deBitsSelector == NULL ||
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pde->deBitmapInfo == NULL ||
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pde->deVersion != 0x0400)
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return FALSE;
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lpbi = &pdva->BitmapInfo;
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hmemcpy(lpbi, pde->deBitmapInfo, sizeof(BITMAPINFOHEADER));
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if (lpbi->biCompression != 0 &&
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lpbi->biCompression != BI_BITFIELDS)
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return FALSE;
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pdva->selSurface = pde->deBitsSelector;
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pdva->offSurface = pde->deBitsOffset;
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pdva->Flags = 0;
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pdva->Version = 0x0100;
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pdva->lpSurface = (LPVOID)pde;
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(FARPROC)pdva->OpenSurface = (FARPROC)vga_open_surface;
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(FARPROC)pdva->CloseSurface = (FARPROC)vga_close_surface;
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(FARPROC)pdva->BeginAccess = (FARPROC)dib_begin_access;
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(FARPROC)pdva->EndAccess = (FARPROC)dib_end_access;
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(FARPROC)pdva->ShowSurface = (FARPROC)NULL;
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if (!(pde->deFlags & CURSOREXCLUDE))
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{
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pdva->BeginAccess = NULL;
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pdva->EndAccess = NULL;
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}
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if (pde->deDeltaScan > 0)
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{
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lpbi->biWidth = (int)pde->deDeltaScan * 8 / (int)pde->deBitsPixel;
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lpbi->biHeight =-(int)pde->deHeight;
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lpbi->biSizeImage = pde->deDeltaScan * pde->deHeight;
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}
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else
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{
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lpbi->biWidth = -(int)pde->deDeltaScan * 8 / (int)pde->deBitsPixel;
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lpbi->biHeight = (int)pde->deHeight;
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lpbi->biSizeImage = -(int)pde->deDeltaScan * pde->deHeight;
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pdva->offSurface += (long)pde->deDeltaScan * (long)pde->deHeight-1;
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}
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//
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// mark the surface as 16:32 pointer access ONLY!
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//
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if (pde->deFlags & BANKEDVRAM)
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pdva->Flags |= DVAF_1632_ACCESS;
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return TRUE;
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}
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