dumpBMP.c

/******************************Module*Header*******************************\
* Module Name: savebmp.c
*
*
* Created: 06-Jan-1992 10:59:36
*
* Copyright (C) 1993-1995 Microsoft Corporation
*
* Contains the main routine, SaveBitmapFile, for saving a DDB into file
* in DIB format.
*
* Dependencies:
*
*   (#defines)
*   (#includes)
*       #include <windows.h>
*
\**************************************************************************/
#define UNICODE
#include <windows.h>
#include <stdio.h>
#include "dumpBMP.h"

/******************************Public*Routine******************************\
* SaveBitmapFile
*
*
* Effects: Save pInfo->hBmpSaved into disk specified by pszFileName
*
* Warnings: assumes hBmpSaved is not selected into window's DC other than
*           pInfo->hwnd's DC
*
\**************************************************************************/

//typedef LPBITMAPINFO PBITMAPINFO; // hack to keep cygwin32b17 happy

void CreateBMPFile(LPCTSTR pszFileName, HBITMAP hBmp, HDC hDC)
{
    HANDLE      hFile;
    HBITMAP     hTmpBmp, hBmpOld;
    BITMAPFILEHEADER    bfh;
    LPBITMAPINFO pbmi;
    PBYTE       pBits;
    BITMAPINFO  bmi;
    PBYTE pjTmp, pjTmpBmi;
    ULONG sizBMI;
	DWORD 		dwBytesWritten;


#if 0
    if (ghPal) {
        SelectPalette(hDC, ghPal, FALSE);
        RealizePalette(hDC);
    }
#endif
    if (!hBmp) {
        fprintf(stderr, "There's no Bitmap to save!");
        return;
    }

    //
    // Let the graphics engine to retrieve the dimension of the bitmap for us
    // GetDIBits uses the size to determine if its BITMAPCOREINFO or BITMAPINFO
    // if BitCount != 0, color table will be retrieved
    //
    bmi.bmiHeader.biSize = 0x28;              // GDI need this to work
    bmi.bmiHeader.biBitCount = 0;             // dont get the color table
    if ((GetDIBits(hDC, hBmp, 0, 0, (LPSTR)NULL, &bmi, DIB_RGB_COLORS)) == 0) {
        fprintf(stderr, "GetDIBits failed!");
        return;
    }

    //
    // Now that we know the size of the image, alloc enough memory to retrieve
    // the actual bits
    //
    if ((pBits = (PBYTE)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT,
                bmi.bmiHeader.biSizeImage)) == NULL) {
        fprintf(stderr, "Failed in Memory Allocation for pBits!");
        return;
    }

    //
    // Note: 24 bits per pixel has no color table.  So, we dont have to
    // allocate memory for retrieving that.  Otherwise, we do.
    //
    pbmi = &bmi;                                      // assume no color table

    switch (bmi.bmiHeader.biBitCount) {
        case 24:                                      // has color table
            sizBMI = sizeof(BITMAPINFOHEADER);
            break;
        case 16:
        case 32:
            sizBMI = sizeof(BITMAPINFOHEADER)+sizeof(DWORD)*3;
            break;
        default:
            sizBMI = sizeof(BITMAPINFOHEADER)+sizeof(RGBQUAD)*(1<<bmi.bmiHeader.biBitCount);
            break;

    }

    //
    // Allocate memory for color table if it is not 24bpp...
    //
    if (sizBMI != sizeof(BITMAPINFOHEADER)) {
        ULONG       sizTmp;
        //
        // I need more memory for the color table
        //
        if ((pbmi = (LPBITMAPINFO)GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizBMI )) == NULL) {
            fprintf(stderr, "Failed in Memory Allocation for pbmi!");
            goto ErrExit1;
        }
        //
        // Now that weve a bigger chunk of memory, lets copy the Bitmap
        // info header data over
        //
        pjTmp = (PBYTE)pbmi;
        pjTmpBmi = (PBYTE)&bmi;
        sizTmp = sizeof(BITMAPINFOHEADER);

        while(sizTmp--)
        {
            *(pjTmp++) = *(pjTmpBmi++);
        }
    }

    //
    // Lets open the file and get ready for writing
    //
    if ((hFile = CreateFileW(pszFileName, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL))
          == INVALID_HANDLE_VALUE) {
        fprintf(stderr, "Failed in OpenFile!");
        goto ErrExit2;
    }

    //
    // But first, fill in the info for the BitmapFileHeader
    //
    bfh.bfType = 0x4D42;                            // BM
    bfh.bfSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+sizBMI+
        pbmi->bmiHeader.biSizeImage;
    bfh.bfReserved1 =
    bfh.bfReserved2 = 0;
    bfh.bfOffBits = sizeof(BITMAPFILEHEADER)+sizBMI;

    //
    // Write out the file header now
    //
    if (WriteFile(hFile, (LPCVOID)&bfh, sizeof(BITMAPFILEHEADER), &dwBytesWritten, NULL) == -1) {
        fprintf(stderr, "Failed in WriteFile!");
        goto ErrExit3;
    }

    //
    // Bitmap cant be selected into a DC when calling GetDIBits
    // Assume that the hDC is the DC where the bitmap would have been selected
    // if indeed it has been selected
    //
    hTmpBmp = CreateCompatibleBitmap(hDC, pbmi->bmiHeader.biWidth, pbmi->bmiHeader.biHeight);
    if (hTmpBmp) {
        hBmpOld = SelectObject(hDC, hTmpBmp);
        if ((GetDIBits(hDC, hBmp, 0, pbmi->bmiHeader.biHeight, (LPSTR)pBits, pbmi, DIB_RGB_COLORS))==0){
            fprintf(stderr, "Failed in GetDIBits!");
            goto ErrExit4;
        }
    } else {
        fprintf(stderr, "Failed in creating bitmap!");
        goto ErrExit3;
    }

    //
    // Now write out the BitmapInfoHeader and color table, if any
    //
    if (WriteFile(hFile, (LPCVOID)pbmi, sizBMI, &dwBytesWritten, NULL) == -1) {
        fprintf(stderr, "Failed in WriteFile!");
        goto ErrExit4;
    }

    //
    // write the bits also
    //
    if (WriteFile(hFile, (LPCVOID)pBits, pbmi->bmiHeader.biSizeImage, &dwBytesWritten, NULL) == -1) {
        fprintf(stderr, "Failed in WriteFile!");
        goto ErrExit4;
    }


ErrExit4:
    SelectObject(hDC, hBmpOld);
    DeleteObject(hTmpBmp);
ErrExit3:
    CloseHandle(hFile);
ErrExit2:
    GlobalFree(pbmi);
ErrExit1:
    GlobalFree(pBits);
    return;
}