The Net: Ultimate Internet Guide/WWLCD1.ISO/pc/directx2/sdk/samples/iklowns/cgscreen.cpp

C/C++ Source or Header | 1996-05-28 | 11.9 KB | 507 lines

/*===========================================================================*\
|
|  File:        cgscreen.cpp
|
|  Description:
|
|-----------------------------------------------------------------------------
|
|  Copyright (C) 1995-1996 Microsoft Corporation.  All Rights Reserved.
|
|  Written by Moss Bay Engineering, Inc. under contract to Microsoft Corporation
|
\*===========================================================================*/

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

    (C) Copyright 1995-1996 Microsoft Corp.  All rights reserved.

    You have a royalty-free right to use, modify, reproduce and
    distribute the Sample Files (and/or any modified version) in
    any way you find useful, provided that you agree that
    Microsoft has no warranty obligations or liability for any
    Sample Application Files which are modified.

    we do not recomend you base your game on IKlowns, start with one of
    the other simpler sample apps in the GDK

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

#include <windows.h>
#include <windowsx.h>
#include "cgdebug.h"
#include "cgbitbuf.h"
#include "cgscreen.h"

// read a .pal file & convert to PALETTEENTRY array
void
ReadPalFile( char* pFile, LPPALETTEENTRY ppe, int count )
{
    int fh;
    WORD i;
    unsigned char   pRgb[4];

    fh = _lopen( pFile, OF_READ);
    if( fh == -1 )
    {
        DB_LOG(DB_PROBLEM, "Can't open palette file.");
        return;
    }

    _llseek(fh, 24, SEEK_SET);

    for( i=0; i < min(256, count); i++ )
    {
        if( sizeof (pRgb) != _lread (fh, pRgb, sizeof (pRgb)))
        {
            _lclose( fh );
            return;
        }
        ppe[i].peRed = (BYTE)pRgb[0];
        ppe[i].peGreen = (BYTE)pRgb[1];
        ppe[i].peBlue = (BYTE)pRgb[2];
    }

    ppe[0].peRed = (BYTE)0;
    ppe[0].peGreen = (BYTE)0;
    ppe[0].peBlue = (BYTE)0;

    if (count >= 256)
    {
        ppe[255].peRed = (BYTE)255;
        ppe[255].peGreen = (BYTE)255;
        ppe[255].peBlue = (BYTE)255;
    }

    _lclose( fh );
}

/*---------------------------------------------------------------------------*\
|
|       Class CGameScreen
|
|  DESCRIPTION:
|       Encapsulates access to video display in Manhattan sample game
|
|
\*---------------------------------------------------------------------------*/
CGameScreen::CGameScreen(
        HWND hwnd,          // this window determines "screen" size
        int logWidth,
        int logHeight,
        int orgX,
        int orgY
        ) : mxCurrent( orgX ),
            myCurrent( orgY ),
            mhwnd( hwnd ),
            mOutWidth( 0 ),
            mOutHeight( 0 ),
            mOldPalette( NULL )
{
    DB_CHECK( hwnd, "DEBUG: NULL hwnd in CGameScreen.");

    if (hwnd)
    {
        HDC hdc = GetDC( hwnd );

        // save previous palette
                mOldPalette = (HPALETTE)GetCurrentObject( hdc, OBJ_PAL );

        //now tell Windows to let us set our palette
//      SetSystemPaletteUse( hdc, SYSPAL_NOSTATIC );

        // determine size of output bitmap
        if (GetClientRect( hwnd, &mScreenRect ))
        {
            mOutWidth = mScreenRect.right;
            mOutHeight = mScreenRect.bottom;

            PatBlt(hdc, 0,0,mOutWidth,mOutHeight,BLACKNESS);
        }
        else
        {
            DB_LOG( DB_PROBLEM, "DEBUG: GetClientRect failed in CGameScreen" );
        }

        ReleaseDC( hwnd, hdc );
    }
}

CGameScreen::~CGameScreen()
{
    HDC hdc = GetDC( HWND_DESKTOP );

    PatBlt(hdc, 0,0,mOutWidth,mOutHeight,BLACKNESS);
    if (mOldPalette)
    {
        SelectPalette( hdc, mOldPalette, FALSE );
    }

//  SetSystemPaletteUse( hdc, SYSPAL_STATIC );
    RealizePalette( hdc );

    ReleaseDC( HWND_DESKTOP, hdc );
}

void CGameScreen::SetPalette(HPALETTE hPal)
{
    HDC hdc = GetDC( HWND_DESKTOP );

    SelectPalette( hdc, hPal, FALSE );

    RealizePalette( hdc );

    ReleaseDC( HWND_DESKTOP, hdc );
}

/*---------------------------------------------------------------------------*\
|
|       Class CGameDDrawScreen
|
|  DESCRIPTION:
|       provide screen access via DirectDraw
|
|
\*---------------------------------------------------------------------------*/

#define FRONT_BUFFER 0
#define BACK_BUFFER 1

CGameDDrawScreen::CGameDDrawScreen(
        HWND hwnd,          // this window determines "screen" size
        int logWidth,
        int logHeight,
        int orgX,
        int orgY
        ) : CGameScreen( hwnd, logWidth, orgX, orgY ),
            mBackSurface( 1 )
{
    // create the primary surfaces (front & back)
    mpSurfaces[0] = new CGameDDrawScreenBuffer;
    mpSurfaces[1] = new CGameDDrawScreenBuffer(mpSurfaces[0]);
}

CGameDDrawScreen::~CGameDDrawScreen()
{
    delete mpSurfaces[1];
    delete mpSurfaces[0];
}

void CGameDDrawScreen::Render(
    int xDest,
    int yDest,
    int wDest,
    int hDest,
    CGameBitBuffer* pSrcBuffer,
    int xSrc,
    int ySrc,
    DWORD rop
    )
{
    pSrcBuffer->BltDDraw(
        mpSurfaces[BACK_BUFFER],
        xDest,
        yDest,
        wDest,
        hDest,
        xSrc,
        ySrc,
        rop
        );
}

void CGameDDrawScreen::TransRender(
    int xDest,
    int yDest,
    int wDest,
    int hDest,
    CGameBitBuffer* pSrcBuffer,
    int xSrc,
    int ySrc
    )
{
    pSrcBuffer->TransBltDDraw(
        (CGameDDrawBitBuffer*) mpSurfaces[BACK_BUFFER],
        xDest,
        yDest,
        wDest,
        hDest,
        xSrc,
        ySrc,
        1
        );
}

void CGameDDrawScreen::PageFlip()
{
    HRESULT result;

    int stopCount = DDRAW_RETRY;

    do
    {
        result = mpSurfaces[FRONT_BUFFER]->mpSurface->Flip(
                    NULL, DDFLIP_WAIT );
        if (result == DDERR_SURFACELOST )
        {
            mpSurfaces[FRONT_BUFFER]->mpSurface->Restore();
            mpSurfaces[BACK_BUFFER]->mpSurface->Restore();
        }
    }
    while( (result != DD_OK) && (--stopCount > 0));
}

void
CGameDDrawScreen::SetMode(
    int width,
    int height,
    int bits
    )
{
    mpSurfaces[FRONT_BUFFER]->SetMode(
                        width,
                        height,
                        bits
                        );
}

void
CGameDDrawScreen::ShowGDIPage()
{
    mpSurfaces[FRONT_BUFFER]->ShowGDIPage();
}

void
CGameDDrawScreen::RestoreMode()
{
    mpSurfaces[FRONT_BUFFER]->RestoreMode();
}

void
CGameDDrawScreen::Refresh()
{
    mpSurfaces[FRONT_BUFFER]->mpSurface->Restore();
    mpSurfaces[BACK_BUFFER]->mpSurface->Restore();
}


void
CGameDDrawScreen::ColorFill(
    LPRECT pRect,
    int palIndex
    )
{
    HRESULT result;
    DDBLTFX dbf;
    RECT tempR = *pRect;

    // rects are off by one
    tempR.right++;
    tempR.bottom++;

    memset( &dbf, 0, sizeof( dbf ) );
    dbf.dwSize = sizeof(dbf);
    dbf.dwFillColor = palIndex;

    int stopCount = DDRAW_RETRY;

    do
    {
        result = mpSurfaces[BACK_BUFFER]->mpSurface->Blt(
            &tempR,     // dest rect
            NULL,       // src surf
            NULL,       // src rect
            DDBLT_COLORFILL,// flags
            &dbf );     // bltfx

        // surface may have been lost due to mode switch
        if (result == DDERR_SURFACELOST)
        {
            mpSurfaces[FRONT_BUFFER]->mpSurface->Restore();
            mpSurfaces[BACK_BUFFER]->mpSurface->Restore();
            continue;
        }
    }
    while( (result != DD_OK) && (--stopCount > 0));
}

// read in a .pal file & set our palette to it
void CGameDDrawScreen::SetPalette( char* pFile )
{
    LPPALETTEENTRY  ppe;

    ppe = new PALETTEENTRY[256];

    ReadPalFile( pFile, ppe, 256 );

    mpSurfaces[FRONT_BUFFER]->SetPalette( ppe );
    delete[] ppe;
}

int
CGameDDrawScreen::GetVideoMemory()
{
    return mpSurfaces[FRONT_BUFFER]->GetVideoMemory();
}

/*---------------------------------------------------------------------------*\
|
|       Class CGameDSScreen
|
|  DESCRIPTION:
|       provide screen access via CreateDIBSection
|
|
\*---------------------------------------------------------------------------*/

CGameDSScreen::CGameDSScreen(
        HWND hwnd,  // this window determines "screen" size
        int logWidth,
        int logHeight,
        int orgX,
        int orgY
        ) : CGameScreen( hwnd, logWidth, orgX, orgY )
{
    LOGPALETTE* pPal;
    HPALETTE hOurPal = NULL;

    pPal = (LOGPALETTE*) GlobalAllocPtr( LPTR, sizeof(LOGPALETTE) + 256 * sizeof(PALETTEENTRY) );

    if (pPal)
    {
        pPal->palNumEntries = 256;
        pPal->palVersion    = 0x300;

        ReadPalFile( "iklowns.pal", pPal->palPalEntry, 256 );

        hOurPal = CreatePalette( pPal );
    }

    GlobalFreePtr( pPal );

    // create the primary surfaces (front & back)
    mpScreenDIB = new CGameDIB( logWidth, logHeight, hOurPal );
    mpBufferDIB = new CGameDIB( logWidth, logHeight, hOurPal );

    if (hwnd)
    {
        mhdcOut = GetDC( hwnd );

        mhdcBackBuffer = CreateCompatibleDC( mhdcOut );

        SelectPalette( mhdcOut, hOurPal, FALSE );
        RealizePalette( mhdcOut );

        SelectPalette( mhdcBackBuffer, hOurPal, FALSE );
        RealizePalette( mhdcBackBuffer );

                HBITMAP hbmOld = (HBITMAP)SelectObject( mhdcBackBuffer, mpBufferDIB->GetHBitmap() );

        if (hbmOld)
            DeleteObject( hbmOld );
    }

}

CGameDSScreen::~CGameDSScreen()
{
    if (mhdcOut)
    {
        // restore the old palette
        if (mOldPalette)
            SelectPalette( mhdcOut, mOldPalette, FALSE );

        ReleaseDC( mhwnd, mhdcOut );
    }

    // free up the backbuffer DC
    if (mhdcBackBuffer)
        DeleteDC( mhdcBackBuffer );

    delete mpBufferDIB;
    delete mpScreenDIB;
}

void CGameDSScreen::Render(
    int xDest,
    int yDest,
    int wDest,
    int hDest,
    CGameBitBuffer* pSrcBuffer,
    int xSrc,
    int ySrc,
    DWORD rop
    )
{
    int scanDest = mpBufferDIB->BytesPerScanline();
    int scanSrc = ((CGameDSBitBuffer*)pSrcBuffer)->mpDIB->BytesPerScanline();

    CopyDIBBits(
        mpBufferDIB->GetPixelAddress( xDest, yDest ),
        ((CGameDSBitBuffer*)pSrcBuffer)->mpDIB->GetPixelAddress( xSrc, ySrc ),
        wDest,  // width pixels
        hDest,
        (DWORD) -scanDest,
        (DWORD) -scanSrc
        );
}

void CGameDSScreen::TransRender(
    int xDest,
    int yDest,
    int wDest,
    int hDest,
    CGameBitBuffer* pSrcBuffer,
    int xSrc,
    int ySrc
    )
{
    int scanDest = mpBufferDIB->BytesPerScanline();
    int scanSrc = ((CGameDSBitBuffer*)pSrcBuffer)->mpDIB->BytesPerScanline();

    TransCopyDIBBits(
        mpBufferDIB->GetPixelAddress( xDest, yDest ),
        ((CGameDSBitBuffer*)pSrcBuffer)->mpDIB->GetPixelAddress( xSrc, ySrc ),
        wDest,  // width pixels
        hDest,
        (DWORD) -scanDest,
        (DWORD) -scanSrc,
        1
        );
}

// we emulate page flipping by simply blitting from back to front
void CGameDSScreen::PageFlip()
{
    BitBlt( mhdcOut, 0, 0, mOutWidth, mOutHeight, mhdcBackBuffer, 0, 0, SRCCOPY );
}

void
CGameDSScreen::ColorFill(
    LPRECT pRect,
    int palIndex
    )
{
    LPBYTE lpdest;
    int bytes = pRect->right - pRect->left + 1;

    for (int line=pRect->top; line<=pRect->bottom; line++)
    {
        lpdest = mpBufferDIB->GetPixelAddress( pRect->left, line );
        memset( lpdest, palIndex, bytes );
    }
}

void CGameDSScreen::SetPalette(HPALETTE hPal)
{
    CGameScreen::SetPalette( hPal );

    SelectPalette( mhdcBackBuffer, hPal, FALSE );
    RealizePalette( mhdcBackBuffer );
}

// read in a .pal file & set our palette to it
void CGameDSScreen::SetPalette( char* pFile )
{
}