如何在C中显示BMP文件 ?

[nwpumtm]

有现成的调用函数最好.

[jingtian]

bmp文件有一个文件头，记录着该文件的信息，譬如分辨率调色版什么的，具体记不清楚了，查一下资料吧。不是很难的。

[rh]

/*==========================================================================
*
* Copyright (C) 1995-1999 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(IDirectDraw *pdd, LPCSTR szBitmap);
extern IDirectDrawSurface * DDLoadBitmap(IDirectDraw *pdd, LPCSTR szBitmap, int dx, int dy);
extern HRESULT DDReLoadBitmap(IDirectDrawSurface *pdds, LPCSTR szBitmap);
extern HRESULT DDCopyBitmap(IDirectDrawSurface *pdds, HBITMAP hbm, int x, int y, int dx, int dy);
extern DWORD DDColorMatch(IDirectDrawSurface *pdds, COLORREF rgb);
extern HRESULT DDSetColorKey(IDirectDrawSurface *pdds, COLORREF rgb);

#ifdef __cplusplus
}
#endif /* __cplusplus */


/////////////////////////下面是CPP文件//////////////////////////////
/*==========================================================================
*
* Copyright (C) 1995-1999 Microsoft Corporation. All Rights Reserved.
*
* File: ddutil.cpp
* Content: Routines for loading bitmap and palettes from resources
*
***************************************************************************/
#undef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <windowsx.h>
#include <ddraw.h>
#include "ddutil.h"

/*
* DDLoadBitmap
*
* create a DirectDrawSurface from a bitmap resource.
*
*/
extern "C" IDirectDrawSurface * DDLoadBitmap(IDirectDraw *pdd, LPCSTR szBitmap, int dx, int dy)
{
HBITMAP hbm;
BITMAP bm;
DDSURFACEDESC ddsd;
IDirectDrawSurface *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)
{
OutputDebugString( "Coould not find bitmap!\n" );
return NULL;
}

//
// get size of the bitmap
//
GetObject(hbm, sizeof(bm), &bm); // get size of bitmap

//
// 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;//|DDSCAPS_VIDEOMEMORY;
ddsd.dwWidth = bm.bmWidth;
ddsd.dwHeight = bm.bmHeight;

if (pdd->CreateSurface(&ddsd, &pdds, NULL) != DD_OK)
{
OutputDebugString( "CreateSurface() failed!\n" );
return NULL;
}

DDCopyBitmap(pdds, hbm, 0, 0,0,0);

DeleteObject(hbm);

return pdds;
}

/*
* DDReLoadBitmap
*
* load a bitmap from a file or resource into a directdraw surface.
* normaly used to re-load a surface after a restore.
*
*/
HRESULT DDReLoadBitmap(IDirectDrawSurface *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;
}

/*
* DDCopyBitmap
*
* draw a bitmap into a DirectDrawSurface
*
*/
extern "C" HRESULT DDCopyBitmap(IDirectDrawSurface *pdds, HBITMAP hbm, int x, int y, int dx, int dy)
{
HDC hdcImage;
HDC hdc;
BITMAP bm;
DDSURFACEDESC 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); // get size of bitmap
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;
}

//
// DDLoadPalette
//
// Create a DirectDraw palette object from a bitmap resoure
//
// if the resource does not exist or NULL is passed create a
// default 332 palette.
//
extern "C" IDirectDrawPalette * DDLoadPalette(IDirectDraw *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[i].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;
}

/*
* DDColorMatch
*
* 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(IDirectDrawSurface *pdds, COLORREF rgb)
{
COLORREF rgbT;
HDC hdc;
DWORD dw = CLR_INVALID;
DDSURFACEDESC 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;
}

/*
* DDSetColorKey
*
* 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(IDirectDrawSurface *pdds, COLORREF rgb)
{
DDCOLORKEY ddck;

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

[tryibest]

这是什么呀,不懂不懂

[leepb]

我也想知道答案！！！

[leepb]

要在Turbo C++中显示位图bmp 和 汉字！

汉字还可以放大的！！！

有现成的源码最好！！！