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DDutil.cpp

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Here is ddutil.cpp :


    


//-----------------------------------------------------------------------------

// File: ddutil.cpp

//

// Desc: Routines for loading bitmap and palettes from resources

//

//

// Copyright (c) 1995-1999 Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------


#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif

//-----------------------------------------------------------------------------

// Include files

//-----------------------------------------------------------------------------

#include <windows.h>
#include <windowsx.h>
#include <ddraw.h>
#include "ddutil.h"




//-----------------------------------------------------------------------------

// Name: DDLoadBitmap()
// Desc: Create a DirectDrawSurface from a bitmap resource.

//-----------------------------------------------------------------------------

extern "C" IDirectDrawSurface7 *
DDLoadBitmap(IDirectDraw7 * pdd, LPCSTR szBitmap, int dx, int dy)
{
HBITMAP hbm;
BITMAP bm;
DDSURFACEDESC2 ddsd;
IDirectDrawSurface7 *pdds;

//

// Try to load the bitmap as a resource, if that fails, try it as a file
//

hbm = (HBITMAP) LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, dx,
dy, LR_CREATEDIBSECTION);
if (hbm == NULL)
hbm = (HBITMAP) LoadImage(NULL, szBitmap, IMAGE_BITMAP, dx, dy,
LR_LOADFROMFILE | LR_CREATEDIBSECTION);
if (hbm == NULL)
return NULL;
//

// Get size of the bitmap

//

GetObject(hbm, sizeof(bm), &bm);
//

// Create a DirectDrawSurface for this bitmap

//

ZeroMemory(&ddsd, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH;
ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
ddsd.dwWidth = bm.bmWidth;
ddsd.dwHeight = bm.bmHeight;
if (pdd->CreateSurface(&ddsd, &pdds, NULL) != DD_OK)
return NULL;
DDCopyBitmap(pdds, hbm, 0, 0, 0, 0);
DeleteObject(hbm);
return pdds;
}




//-----------------------------------------------------------------------------

// Name: DDReLoadBitmap()
// Desc: Load a bitmap from a file or resource into a directdraw surface.

// normaly used to re-load a surface after a restore.

//-----------------------------------------------------------------------------

HRESULT
DDReLoadBitmap(IDirectDrawSurface7 * pdds, LPCSTR szBitmap)
{
HBITMAP hbm;
HRESULT hr;

//

// Try to load the bitmap as a resource, if that fails, try it as a file
//

hbm = (HBITMAP) LoadImage(GetModuleHandle(NULL), szBitmap, IMAGE_BITMAP, 0,
0, LR_CREATEDIBSECTION);
if (hbm == NULL)
hbm = (HBITMAP) LoadImage(NULL, szBitmap, IMAGE_BITMAP, 0, 0,
LR_LOADFROMFILE | LR_CREATEDIBSECTION);
if (hbm == NULL)
{
OutputDebugString("handle is null\n");
return E_FAIL;
}
hr = DDCopyBitmap(pdds, hbm, 0, 0, 0, 0);
if (hr != DD_OK)
{
OutputDebugString("ddcopybitmap failed\n");
}
DeleteObject(hbm);
return hr;
}




//-----------------------------------------------------------------------------

// Name: DDCopyBitmap()
// Desc: Draw a bitmap into a DirectDrawSurface

//-----------------------------------------------------------------------------

extern "C" HRESULT
DDCopyBitmap(IDirectDrawSurface7 * pdds, HBITMAP hbm, int x, int y,
int dx, int dy)
{
HDC hdcImage;
HDC hdc;
BITMAP bm;
DDSURFACEDESC2 ddsd;
HRESULT hr;

if (hbm == NULL || pdds == NULL)
return E_FAIL;
//

// Make sure this surface is restored.

//

pdds->Restore();
//

// Select bitmap into a memoryDC so we can use it.

//

hdcImage = CreateCompatibleDC(NULL);
if (!hdcImage)
OutputDebugString("createcompatible dc failed\n");
SelectObject(hdcImage, hbm);
//

// Get size of the bitmap

//

GetObject(hbm, sizeof(bm), &bm);
dx = dx == 0 ? bm.bmWidth : dx; // Use the passed size, unless zero
dy = dy == 0 ? bm.bmHeight : dy;
//

// Get size of surface.

//

ddsd.dwSize = sizeof(ddsd);
ddsd.dwFlags = DDSD_HEIGHT | DDSD_WIDTH;
pdds->GetSurfaceDesc(&ddsd);

if ((hr = pdds->GetDC(&hdc)) == DD_OK)
{
StretchBlt(hdc, 0, 0, ddsd.dwWidth, ddsd.dwHeight, hdcImage, x, y,
dx, dy, SRCCOPY);
pdds->ReleaseDC(hdc);
}
DeleteDC(hdcImage);
return hr;
}




//-----------------------------------------------------------------------------

// Name: DDLoadPalette()
// Desc: Create a DirectDraw palette object from a bitmap resource

// if the resource does not exist or NULL is passed create a

// default 332 palette.

//-----------------------------------------------------------------------------

extern "C" IDirectDrawPalette *
DDLoadPalette(IDirectDraw7 * pdd, LPCSTR szBitmap)
{
IDirectDrawPalette *ddpal;
int i;
int n;
int fh;
HRSRC h;
LPBITMAPINFOHEADER lpbi;
PALETTEENTRY ape[256];
RGBQUAD *prgb;

//

// Build a 332 palette as the default.

//

for (i = 0; i < 256; i++)
{
ape .peRed = (BYTE) (((i >> 5) & 0x07) * 255 / 7);
ape<i>.peGreen = (BYTE) (((i >> 2) & 0x07) * 255 / 7);
ape[i].peBlue = (BYTE) (((i >> 0) & 0x03) * 255 / 3);
ape[i].peFlags = (BYTE) 0;
}
//

// Get a pointer to the bitmap resource.

//

if (szBitmap && (h = FindResource(NULL, szBitmap, RT_BITMAP)))
{
lpbi = (LPBITMAPINFOHEADER) LockResource(LoadResource(NULL, h));
if (!lpbi)
OutputDebugString("lock resource failed\n");
prgb = (RGBQUAD *) ((BYTE *) lpbi + lpbi->biSize);
if (lpbi == NULL || lpbi->biSize < sizeof(BITMAPINFOHEADER))
n = 0;
else if (lpbi->biBitCount > 8)
n = 0;
else if (lpbi->biClrUsed == 0)
n = 1 << lpbi->biBitCount;
else
n = lpbi->biClrUsed;
//

// A DIB color table has its colors stored BGR not RGB

// so flip them around.

//

for (i = 0; i < n; i++)
{
ape[i].peRed = prgb[i].rgbRed;
ape[i].peGreen = prgb[i].rgbGreen;
ape[i].peBlue = prgb[i].rgbBlue;
ape[i].peFlags = 0;
}
}
else if (szBitmap && (fh = _lopen(szBitmap, OF_READ)) != -1)
{
BITMAPFILEHEADER bf;
BITMAPINFOHEADER bi;

_lread(fh, &bf, sizeof(bf));
_lread(fh, &bi, sizeof(bi));
_lread(fh, ape, sizeof(ape));
_lclose(fh);
if (bi.biSize != sizeof(BITMAPINFOHEADER))
n = 0;
else if (bi.biBitCount > 8)
n = 0;
else if (bi.biClrUsed == 0)
n = 1 << bi.biBitCount;
else
n = bi.biClrUsed;
//

// A DIB color table has its colors stored BGR not RGB

// so flip them around.

//

for (i = 0; i < n; i++)
{
BYTE r = ape[i].peRed;

ape[i].peRed = ape[i].peBlue;
ape[i].peBlue = r;
}
}
pdd->CreatePalette(DDPCAPS_8BIT, ape, &ddpal, NULL);
return ddpal;
}




//-----------------------------------------------------------------------------

// Name: DDColorMatch()
// Desc: Convert a RGB color to a pysical color.

// We do this by leting GDI SetPixel() do the color matching
// then we lock the memory and see what it got mapped to.

//-----------------------------------------------------------------------------

extern "C" DWORD
DDColorMatch(IDirectDrawSurface7 * pdds, COLORREF rgb)
{
COLORREF rgbT;
HDC hdc;
DWORD dw = CLR_INVALID;
DDSURFACEDESC2 ddsd;
HRESULT hres;

//

// Use GDI SetPixel to color match for us

//

if (rgb != CLR_INVALID && pdds->GetDC(&hdc) == DD_OK)
{
rgbT = GetPixel(hdc, 0, 0); // Save current pixel value

SetPixel(hdc, 0, 0, rgb); // Set our value

pdds->ReleaseDC(hdc);
}
//

// Now lock the surface so we can read back the converted color

//

ddsd.dwSize = sizeof(ddsd);
while ((hres = pdds->Lock(NULL, &ddsd, 0, NULL)) == DDERR_WASSTILLDRAWING)
;
if (hres == DD_OK)
{
dw = *(DWORD *) ddsd.lpSurface; // Get DWORD

if (ddsd.ddpfPixelFormat.dwRGBBitCount < 32)
dw &= (1 << ddsd.ddpfPixelFormat.dwRGBBitCount) - 1; // Mask it to bpp

pdds->Unlock(NULL);
}
//

// Now put the color that was there back.

//

if (rgb != CLR_INVALID && pdds->GetDC(&hdc) == DD_OK)
{
SetPixel(hdc, 0, 0, rgbT);
pdds->ReleaseDC(hdc);
}
return dw;
}




//-----------------------------------------------------------------------------

// Name: DDSetColorKey()
// Desc: Set a color key for a surface, given a RGB.
// If you pass CLR_INVALID as the color key, the pixel
// in the upper-left corner will be used.

//-----------------------------------------------------------------------------

extern "C" HRESULT
DDSetColorKey(IDirectDrawSurface7 * pdds, COLORREF rgb)
{
DDCOLORKEY ddck;

ddck.dwColorSpaceLowValue = DDColorMatch(pdds, rgb);
ddck.dwColorSpaceHighValue = ddck.dwColorSpaceLowValue;
return pdds->SetColorKey(DDCKEY_SRCBLT, &ddck);
}




Edited by - Prosper/LOADED on July 23, 2000 11:48:32 PM

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and ddutil.h :


    


/*==========================================================================
*
* Copyright (C) 1998-1999 Microsoft Corporation. All Rights Reserved.
*
* File: ddutil.cpp
* Content: Routines for loading bitmap and palettes from resources
*
***************************************************************************/

#ifdef __cplusplus
extern "C" { /* Assume C declarations for C++ */
#endif /* __cplusplus */

extern IDirectDrawPalette *DDLoadPalette(IDirectDraw7 *pdd, LPCSTR szBitmap);
extern IDirectDrawSurface7 *DDLoadBitmap(IDirectDraw7 *pdd, LPCSTR szBitmap, int dx, int dy);
extern HRESULT DDReLoadBitmap(IDirectDrawSurface7 *pdds, LPCSTR szBitmap);
extern HRESULT DDCopyBitmap(IDirectDrawSurface7 *pdds, HBITMAP hbm, int x, int y, int dx, int dy);
extern DWORD DDColorMatch(IDirectDrawSurface7 *pdds, COLORREF rgb);
extern HRESULT DDSetColorKey(IDirectDrawSurface7 *pdds, COLORREF rgb);

#ifdef __cplusplus
}
#endif /* __cplusplus */




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