gusucode.com > VC++ EMF图片浏览器(可读emf、wmf、emz、wmz、png……等)-源码程序 > VC++ EMF图片浏览器(可读emf、wmf、emz、wmz、png……等)-源码程序/code/Src/Client/scwinlib/MSDib.cpp
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/*
* This file is part of the EMFexplorer projet.
* Copyright (C) 2004 Smith Charles.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* Extension: for commercial use, apply the Equity Public License, which
* adds to the normal terms of the GLPL a condition of donation to the author.
* If you are interested in support for this source code,
* contact Smith Charles <smith.charles@free.fr> for more information.
*/
#include "stdafx.h"
#include "MSDib.h"
#ifndef SC_USE_MSDIBCODE
#error "Provide your implementation for DIBNumColors,..."
#else
////////////////////////////////////////////////////////////////////////////////////////
// (c) Microsoft, 1991-1998 / MSDN / DIBUTIL.C, DIB.C
//
/*************************************************************************
* This function calculates the number of colors in the DIB's color table
* by finding the bits per pixel for the DIB (whether Win3.0 or other-style
* DIB). If bits per pixel is 1: colors=2, if 4: colors=16, if 8: colors=256,
* if 24, no colors in color table.
*
************************************************************************/
WORD WINAPI DIBNumColors(LPBITMAPINFOHEADER lpbi)
{
WORD wBitCount; // DIB bit count
/* If this is a Windows-style DIB, the number of colors in the
* color table can be less than the number of bits per pixel
* allows for (i.e. lpbi->biClrUsed can be set to some value).
* If this is the case, return the appropriate value.
*/
if (IS_WIN30_DIB(lpbi))
{
DWORD dwClrUsed;
dwClrUsed = ((LPBITMAPINFOHEADER)lpbi)->biClrUsed;
if (dwClrUsed != 0)
return (WORD)dwClrUsed;
}
/* Calculate the number of colors in the color table based on
* the number of bits per pixel for the DIB.
*/
if (IS_WIN30_DIB(lpbi))
wBitCount = ((LPBITMAPINFOHEADER)lpbi)->biBitCount;
else
wBitCount = ((LPBITMAPCOREHEADER)lpbi)->bcBitCount;
/* return number of colors based on bits per pixel */
switch (wBitCount)
{
case 1:
return 2;
case 4:
return 16;
case 8:
return 256;
default:
return 0;
}
}
/*************************************************************************
* This function gets the size required to store the DIB's palette by
* multiplying the number of colors by the size of an RGBQUAD (for a
* Windows 3.0-style DIB) or by the size of an RGBTRIPLE (for an other-
* style DIB).
*
************************************************************************/
WORD WINAPI PaletteSize(LPBITMAPINFOHEADER lpbi)
{
/* calculate the size required by the palette */
if (IS_WIN30_DIB (lpbi))
return (WORD)(::DIBNumColors(lpbi) * sizeof(RGBQUAD));
else
return (WORD)(::DIBNumColors(lpbi) * sizeof(RGBTRIPLE));
}
// dib.c
/****************************************************************************
* *
* FUNCTION : DibFromBitmap() *
* *
* PURPOSE : Will create a global memory block in DIB format that *
* represents the Device-dependent bitmap (DDB) passed in. *
* *
* RETURNS : A handle to the DIB *
* *
****************************************************************************/
HANDLE DibFromBitmap(HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal)
{
BITMAP bm;
BITMAPINFOHEADER bi;
LPBITMAPINFOHEADER lpbi;
DWORD dwLen;
HANDLE hdib;
HANDLE h;
HDC hdc;
if (!hbm)
return NULL;
if (hpal == NULL)
hpal = (HPALETTE)GetStockObject(DEFAULT_PALETTE);
GetObject(hbm,sizeof(bm),(LPSTR)&bm);
if (biBits == 0)
biBits = bm.bmPlanes * bm.bmBitsPixel;
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biCompression = biStyle;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwLen = bi.biSize + PaletteSize(&bi);
hdc = GetDC(NULL);
hpal = SelectPalette(hdc,hpal,FALSE);
RealizePalette(hdc);
hdib = GlobalAlloc(GHND,dwLen);
if (!hdib)
{
SelectPalette(hdc,hpal,FALSE);
ReleaseDC(NULL,hdc);
return NULL;
}
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hdib);
*lpbi = bi;
/* call GetDIBits with a NULL lpBits param, so it will calculate the
* biSizeImage field for us
*/
GetDIBits(hdc, hbm, 0, (WORD)bi.biHeight,
NULL, (LPBITMAPINFO)lpbi, DIB_RGB_COLORS);
bi = *lpbi;
GlobalUnlock(hdib);
/* If the driver did not fill in the biSizeImage field, make one up */
if (bi.biSizeImage == 0)
{
bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
if (biStyle != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
}
/* realloc the buffer big enough to hold all the bits */
dwLen = bi.biSize + PaletteSize(&bi) + bi.biSizeImage;
if (h = GlobalReAlloc(hdib,dwLen,0))
hdib = h;
else
{
GlobalFree(hdib);
hdib = NULL;
SelectPalette(hdc,hpal,FALSE);
ReleaseDC(NULL,hdc);
return hdib;
}
/* call GetDIBits with a NON-NULL lpBits param, and actualy get the
* bits this time
*/
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hdib);
if (GetDIBits( hdc,
hbm,
0,
(WORD)bi.biHeight,
(LPSTR)lpbi + (WORD)lpbi->biSize + PaletteSize(lpbi),
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS) == 0)
{
GlobalUnlock(hdib);
hdib = NULL;
SelectPalette(hdc,hpal,FALSE);
ReleaseDC(NULL,hdc);
return NULL;
}
bi = *lpbi;
GlobalUnlock(hdib);
SelectPalette(hdc,hpal,FALSE);
ReleaseDC(NULL,hdc);
return hdib;
}
#endif
// End of Microsoft code
////////////////////////////////////////////////////////////////////////////////////////////