本文详细介绍了设备独立位图（DIB）API的功能原型和常量，涵盖了DIB的创建、销毁、读取及属性获取等操作。通过宏定义和函数说明，帮助读者理解DIB在文件中如何表示及其在不同上下文中的使用。
/********************************************************************************
* DIBAPI.H
*
* Header file for Device-Independent Bitmap (DIB) API. Provides
* function prototypes and constants for DIB functions
********************************************************************************/
#ifndef __DIBAPI_H_
#define __DIBAPI_H_
//////////////////////////////////////////////////////////
/* Handle to a DIB */
#define HDIB HANDLE
// Dib Header Marker - used in writing DIBs to files
#define DIB_HEADER_MARKER ((WORD) ('M' << 8) | 'B')
/* DIB constants */
#define PALVERSION 0x300
/* DIB copy constants */
#define PW_WINDOW 1
#define PW_CLIENT 2
/* DIB Macros*/
// WIDTHBYTES performs DWORD-aligning of DIB scanlines. The "bits"
// parameter is the bit count for the scanline (biWidth * biBitCount),
// and this macro returns the number of DWORD-aligned bytes needed
// to hold those bits.
#define WIDTHBYTES(bits) (((bits) + 31) / 32 * 4)
#define IS_WIN30_DIB(lpbi) ((*(LPDWORD)(lpbi)) == sizeof(BITMAPINFOHEADER))
#define RECTWIDTH(lpRect) ((lpRect)->right - (lpRect)->left)
#define RECTHEIGHT(lpRect) ((lpRect)->bottom - (lpRect)->top)
#define WaitCursorBegin() HCURSOR hcURSOR = SetCursor(LoadCursor(NULL, IDC_WAIT))
#define WaitCursorEnd() SetCursor(hcURSOR)
/* function prototypes */
// DIB initialization
HDIB CreateDIB(DWORD, DWORD, WORD);
HDIB CreateDefaultDIB(DWORD dwWidth, DWORD dwHeight);
void DestroyDIB(HDIB);
HDIB LoadDIB (LPTSTR);
BOOL SaveDIB (HDIB, LPTSTR);
HDIB ReadDIBFile(HANDLE);
// DIB attributes
DWORD BytesPerLine(LPBYTE lpDIB);
DWORD BytesPerLine(HDIB hDIB);
DWORD DIBlockSize(HDIB hDIB);
DWORD DIBlockSize(LPBYTE lpDIB);
DWORD DIBHeight (LPBYTE lpDIB);
DWORD DIBHeight (HDIB hDIB);
DWORD DIBWidth (LPBYTE lpDIB);
DWORD DIBWidth (HDIB hDIB);
WORD DIBNumColors (LPBYTE lpDIB);
WORD DIBNumColors (HDIB hDIB);
WORD DIBBitCount (LPBYTE lpDIB);
WORD DIBBitCount (HDIB hDIB);
LPBYTE FindDIBBits (LPBYTE lpDIB);
WORD PaletteSize (LPBYTE lpDIB);
WORD PaletteSize (HDIB hDIB);
// DIB display
BOOL PaintBitmap(HDC, LPRECT, HBITMAP, LPRECT, HPALETTE, DWORD);
BOOL PaintDIB(HDC, LPRECT, HDIB, LPRECT, HPALETTE, DWORD);
// DIB operations
HBITMAP DIBToDIBSection(LPBYTE lpDIB);
HBITMAP DIBToDIBSection(HDIB hDIB);
HDIB DIBSectionToDIB(HBITMAP hBitmap);
HDIB ConvertDIBFormat(LPBYTE lpSrcDIB, UINT nWidth, UINT nHeight, UINT nbpp, BOOL bStretch, HPALETTE hPalSrc);
HDIB ConvertDIBFormat(HDIB hDIB, UINT nWidth, UINT nHeight, UINT nbpp, BOOL bStretch, HPALETTE hPalSrc);
HDIB ConvertDIBFormat(LPBYTE lpSrcDIB, UINT nbpp, HPALETTE hPalSrc);
HDIB ConvertDIBFormat(HDIB hDIB, UINT nbpp, HPALETTE hPalSrc);
HDIB BitmapToDIB (HBITMAP, HPALETTE);
HDIB BitmapToDIB (HBITMAP, HPALETTE, WORD);
HDIB ChangeBitmapFormat (HBITMAP, WORD, DWORD, HPALETTE);
HBITMAP DIBToBitmap (HDIB hDIB, HPALETTE hPal);
HDIB ChangeDIBFormat (HDIB, WORD, DWORD);
BOOL CopyColorTable( LPBITMAPINFO lpTarget, LPBITMAPINFO lpSource, HPALETTE hPalSrc );
// DIB palette
HPALETTE CreateDIBPalette(LPBYTE lpDIB);
HPALETTE CreateDIBPalette(HDIB hDIB);
BOOL DisplayPalette(HDC hDC, LPRECT lpRect, HPALETTE hPal);
HPALETTE CopyPalette(HPALETTE hPalSrc);
HPALETTE GetSystemPalette(void);
int PalEntriesOnDevice (HDC hDC);
HPALETTE CreateIdentifyPalette(HPALETTE hPalSrc);
BOOL MapDIBColorsToPalette(HDIB hDIB, HPALETTE hPalette);
// DIB capture
HBITMAP CopyScreenToBitmap (LPRECT);
HBITMAP CopyWindowToBitmap (HWND, WORD);
HBITMAP CopyClientRectToBitmap(HWND hWnd, LPRECT lpRect);
HDIB CopyScreenToDIB (LPRECT);
HDIB CopyWindowToDIB (HWND, WORD);
HDIB CopyClientRectToDIB(HWND hWnd, LPRECT lpRect);
// Color quantization
HPALETTE CreateOctreePalette(HDIB hDIB, UINT nMaxColors, UINT nColorBits);
HPALETTE CreateOctreePalette(LPBYTE lpDIB, UINT nMaxColors, UINT nColorBits);
HANDLE CopyHandle(HANDLE h);
//////////////////////////////////////////////////////////
#endif //__DIBAPI_H_
==================================================================================
//**********************************************************************
//
// AIBAPI.CPP
//
// Source file for Device-Independent Bitmap (DIB) API.
//
//**********************************************************************
#define STRICT // enable strict type checking
#include "stdafx.h"
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <direct.h>
#include <stdlib.h>
#include <assert.h>
#include <windows.h>
#include <windowsx.h>
#include <mmsystem.h>
#include "dibapi.h"
/*************************************************************************
*
* CreateDIB()
*
* Parameters:
*
* DWORD dwWidth - Width for new bitmap, in pixels
* DWORD dwHeight - Height for new bitmap
* WORD wBitCount - Bit Count for new DIB (1, 4, 8, or 24)
*
* Return Value:
*
* HDIB - Handle to new DIB
*
* Description:
*
* This function allocates memory for and initializes a new DIB by
* filling in the BITMAPINFOHEADER, allocating memory for the color
* table, and allocating memory for the bitmap bits. As with all
* HDIBs, the header, colortable and bits are all in one contiguous
* memory block. This function is similar to the CreateBitmap()
* Windows API.
*
* The colortable and bitmap bits are left uninitialized (zeroed) in the
* returned HDIB.
*
*
************************************************************************/
HDIB CreateDIB(DWORD dwWidth, DWORD dwHeight, WORD wBitCount)
{
BITMAPINFOHEADER bi; // bitmap header
LPBITMAPINFOHEADER lpbi; // pointer to BITMAPINFOHEADER
DWORD dwLen; // size of memory block
HDIB hDIB;
DWORD dwBytesPerLine; // Number of bytes per scanline
// Make sure bits per pixel is valid
if (wBitCount <= 1)
wBitCount = 1;
else if (wBitCount <= 4)
wBitCount = 4;
else if (wBitCount <= 8)
wBitCount = 8;
else if (wBitCount <= 24)
wBitCount = 24;
else
wBitCount = 4; // set default value to 4 if parameter is bogus
// initialize BITMAPINFOHEADER
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = dwWidth; // fill in width from parameter
bi.biHeight = dwHeight; // fill in height from parameter
bi.biPlanes = 1; // must be 1
bi.biBitCount = wBitCount; // from parameter
bi.biCompression = BI_RGB;
bi.biSizeImage = 0; // 0's here mean "default"
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
// calculate size of memory block required to store the DIB. This
// block should be big enough to hold the BITMAPINFOHEADER, the color
// table, and the bits
dwBytesPerLine = WIDTHBYTES(wBitCount * dwWidth);
dwLen = bi.biSize + PaletteSize((LPBYTE)&bi) + (dwBytesPerLine * dwHeight);
// alloc memory block to store our bitmap
hDIB = GlobalAlloc(GHND, dwLen);
// major bummer if we couldn't get memory block
if (!hDIB)
return NULL;
// lock memory and get pointer to it
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
// use our bitmap info structure to fill in first part of
// our DIB with the BITMAPINFOHEADER
*lpbi = bi;
// Since we don't know what the colortable and bits should contain,
// just leave these blank. Unlock the DIB and return the HDIB.
GlobalUnlock(hDIB);
//return handle to the DIB
return hDIB;
}
/*************************************************************************
*
* CreateDefaultDIB()
*
* Parameters:
*
* DWORD dwWidth - Width for new bitmap, in pixels
* DWORD dwHeight - Height for new bitmap
*
* Return Value:
*
* HDIB - Handle to new DIB
*
* Description:
*
* This function allocates memory for and initializes a new DIB by
* filling in the BITMAPINFOHEADER, allocating memory for the color
* table, and allocating memory for the bitmap bits. As with all
* HDIBs, the header, colortable and bits are all in one contiguous
* memory block. This function is similar to the CreateBitmap()
* Windows API.
*
* The colortable is initialized with system palette, but bitmap bits
* are left uninitialized (zeroed) in the returned HDIB.
*
*
************************************************************************/
HDIB CreateDefaultDIB(DWORD dwWidth, DWORD dwHeight)
{
// Get DC
HDC hDC = GetDC(NULL);
if (!hDC)
return NULL;
// DC bts/pixel
int nDeviceBitsPixel = GetDeviceCaps(hDC, BITSPIXEL);
// create DIB according to DC
HDIB hDIB = CreateDIB(dwWidth, dwHeight, nDeviceBitsPixel);
// DIB buffer
LPBITMAPINFO lpbmi = (LPBITMAPINFO)GlobalLock(hDIB);
LPBYTE lpDIBBits = FindDIBBits((LPBYTE)lpbmi);
DWORD dwBitsSize = lpbmi->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpbmi->bmiHeader));
// set DIB color to White
for (DWORD l=0; l<dwBitsSize; ++l)
lpDIBBits[l] = 0xff;
// if no palette, return DIB handle
if (nDeviceBitsPixel > 8)
{
GlobalUnlock(hDIB);
ReleaseDC(NULL, hDC);
return hDIB;
}
// if there is palette, set system palette to DIB
// colors in system palette
int nColors = PalEntriesOnDevice(hDC); // Number of palette entries
// Copy the current system palette into our logical palette
PALETTEENTRY pe[256];
GetSystemPaletteEntries(hDC, 0, nColors, pe);
// set color table
for (int i=0; i<nColors; ++i)
{
lpbmi->bmiColors[i].rgbRed = pe[i].peRed;
lpbmi->bmiColors[i].rgbGreen = pe[i].peGreen;
lpbmi->bmiColors[i].rgbBlue = pe[i].peBlue;
lpbmi->bmiColors[i].rgbReserved = 0;
}
// clean up
GlobalUnlock(hDIB);
ReleaseDC(NULL, hDC);
return hDIB;
}
/*************************************************************************
*
* DestroyDIB ()
*
* Purpose: Frees memory associated with a DIB
*
* Returns: none
*
*************************************************************************/
void DestroyDIB(HDIB hDib)
{
GlobalFree(hDib);
}
/*************************************************************************
*
* Function: ReadDIBFile (int)
*
* Purpose: Reads in the specified DIB file into a global chunk of
* memory.
*
* Returns: A handle to a dib (hDIB) if successful.
* NULL if an error occurs.
*
* Comments: BITMAPFILEHEADER is stripped off of the DIB. Everything
* from the end of the BITMAPFILEHEADER structure on is
* returned in the global memory handle.
*
*
* NOTE: The DIB API were not written to handle OS/2 DIBs, so this
* function will reject any file that is not a Windows DIB.
*
*************************************************************************/
HANDLE ReadDIBFile(HANDLE hFile)
{
BITMAPFILEHEADER bmfHeader;
DWORD dwBitsSize;
UINT nNumColors; // Number of colors in table
HANDLE hDIB;
HANDLE hDIBtmp; // Used for GlobalRealloc() //MPB
LPBITMAPINFOHEADER lpbi;
DWORD offBits;
DWORD dwRead;
// get length of DIB in bytes for use when reading
dwBitsSize = GetFileSize(hFile, NULL);
// Allocate memory for header & color table. We'll enlarge this
// memory as needed.
hDIB = GlobalAlloc(GMEM_MOVEABLE, (DWORD)(sizeof(BITMAPINFOHEADER) +
256 * sizeof(RGBQUAD)));
if (!hDIB)
return NULL;
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
if (!lpbi)
{
GlobalFree(hDIB);
return NULL;
}
// read the BITMAPFILEHEADER from our file
if (!ReadFile(hFile, (LPBYTE)&bmfHeader, sizeof (BITMAPFILEHEADER),
&dwRead, NULL))
goto ErrExit;
if (sizeof (BITMAPFILEHEADER) != dwRead)
goto ErrExit;
if (bmfHeader.bfType != 0x4d42) // 'BM'
goto ErrExit;
// read the BITMAPINFOHEADER
if (!ReadFile(hFile, (LPBYTE)lpbi, sizeof(BITMAPINFOHEADER), &dwRead,
NULL))
goto ErrExit;
if (sizeof(BITMAPINFOHEADER) != dwRead)
goto ErrExit;
// Check to see that it's a Windows DIB -- an OS/2 DIB would cause
// strange problems with the rest of the DIB API since the fields
// in the header are different and the color table entries are
// smaller.
//
// If it's not a Windows DIB (e.g. if biSize is wrong), return NULL.
if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
goto ErrExit;
// Now determine the size of the color table and read it. Since the
// bitmap bits are offset in the file by bfOffBits, we need to do some
// special processing here to make sure the bits directly follow
// the color table (because that's the format we are susposed to pass
// back)
if (!(nNumColors = (UINT)lpbi->biClrUsed))
{
// no color table for 24-bit, default size otherwise
if (lpbi->biBitCount != 24)
nNumColors = 1 << lpbi->biBitCount; // standard size table
}
// fill in some default values if they are zero
if (lpbi->biClrUsed == 0)
lpbi->biClrUsed = nNumColors;
if (lpbi->biSizeImage == 0)
{
lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) +
31) & ~31) >> 3) * lpbi->biHeight;
}
// get a proper-sized buffer for header, color table and bits
GlobalUnlock(hDIB);
hDIBtmp = GlobalReAlloc(hDIB, lpbi->biSize + nNumColors *
sizeof(RGBQUAD) + lpbi->biSizeImage, 0);
if (!hDIBtmp) // can't resize buffer for loading
goto ErrExitNoUnlock; //MPB
else
hDIB = hDIBtmp;
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
// read the color table
ReadFile (hFile, (LPBYTE)(lpbi) + lpbi->biSize,
nNumColors * sizeof(RGBQUAD), &dwRead, NULL);
// offset to the bits from start of DIB header
offBits = lpbi->biSize + nNumColors * sizeof(RGBQUAD);
// If the bfOffBits field is non-zero, then the bits might *not* be
// directly following the color table in the file. Use the value in
// bfOffBits to seek the bits.
if (bmfHeader.bfOffBits != 0L)
SetFilePointer(hFile, bmfHeader.bfOffBits, NULL, FILE_BEGIN);
if (ReadFile(hFile, (LPBYTE)lpbi + offBits, lpbi->biSizeImage, &dwRead,
NULL))
goto OKExit;
ErrExit:
GlobalUnlock(hDIB);
ErrExitNoUnlock:
GlobalFree(hDIB);
return NULL;
OKExit:
GlobalUnlock(hDIB);
return hDIB;
}
/*************************************************************************
*
* LoadDIB()
*
* Loads the specified DIB from a file, allocates memory for it,
* and reads the disk file into the memory.
*
*
* Parameters:
*
* LPCTSTR lpFileName - specifies the file to load a DIB from
*
* Returns: A handle to a DIB, or NULL if unsuccessful.
*
* NOTE: The DIB API were not written to handle OS/2 DIBs; This
* function will reject any file that is not a Windows DIB.
*
*************************************************************************/
HDIB LoadDIB(LPCTSTR lpFileName)
{
HDIB hDIB;
HANDLE hFile;
// Set the cursor to a hourglass, in case the loading operation
// takes more than a sec, the user will know what's going on.
SetCursor(LoadCursor(NULL, IDC_WAIT));
if ((hFile = CreateFile(lpFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,
NULL)) != INVALID_HANDLE_VALUE)
{
hDIB = ReadDIBFile(hFile);
CloseHandle(hFile);
SetCursor(LoadCursor(NULL, IDC_ARROW));
return hDIB;
}
else
{
SetCursor(LoadCursor(NULL, IDC_ARROW));
return NULL;
}
}
/*************************************************************************
*
* SaveDIB()
*
* Saves the specified DIB into the specified file name on disk. No
* error checking is done, so if the file already exists, it will be
* written over.
*
* Parameters:
*
* HDIB hDib - Handle to the dib to save
*
* LPCTSTR lpFileName - pointer to full pathname to save DIB under
*
* Return value: TRUE if successful
* FALSE if failure
*
*************************************************************************/
BOOL SaveDIB(HDIB hDib, LPCTSTR lpFileName)
{
BITMAPFILEHEADER bmfHdr; // Header for Bitmap file
LPBITMAPINFOHEADER lpBI; // Pointer to DIB info structure
HANDLE fh; // file handle for opened file
DWORD dwDIBSize;
DWORD dwWritten;
if (!hDib)
return FALSE;
fh = CreateFile(lpFileName, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fh == INVALID_HANDLE_VALUE)
return FALSE;
// Get a pointer to the DIB memory, the first of which contains
// a BITMAPINFO structure
lpBI = (LPBITMAPINFOHEADER)GlobalLock(hDib);
if (!lpBI)
{
CloseHandle(fh);
return FALSE;
}
// Check to see if we're dealing with an OS/2 DIB. If so, don't
// save it because our functions aren't written to deal with these
// DIBs.
if (lpBI->biSize != sizeof(BITMAPINFOHEADER))
{
GlobalUnlock(hDib);
CloseHandle(fh);
return FALSE;
}
// Fill in the fields of the file header
// Fill in file type (first 2 bytes must be "BM" for a bitmap)
bmfHdr.bfType = DIB_HEADER_MARKER; // "BM"
// Calculating the size of the DIB is a bit tricky (if we want to
// do it right). The easiest way to do this is to call GlobalSize()
// on our global handle, but since the size of our global memory may have
// been padded a few bytes, we may end up writing out a few too
// many bytes to the file (which may cause problems with some apps,
// like HC 3.0).
//
// So, instead let's calculate the size manually.
//
// To do this, find size of header plus size of color table. Since the
// first DWORD in both BITMAPINFOHEADER and BITMAPCOREHEADER conains
// the size of the structure, let's use this.
// Partial Calculation
dwDIBSize = *(LPDWORD)lpBI + PaletteSize((LPBYTE)lpBI);
// Now calculate the size of the image
// It's an RLE bitmap, we can't calculate size, so trust the biSizeImage
// field
if ((lpBI->biCompression == BI_RLE8) || (lpBI->biCompression == BI_RLE4))
dwDIBSize += lpBI->biSizeImage;
else
{
DWORD dwBmBitsSize; // Size of Bitmap Bits only
// It's not RLE, so size is Width (DWORD aligned) * Height
dwBmBitsSize = WIDTHBYTES((lpBI->biWidth)*((DWORD)lpBI->biBitCount)) *
lpBI->biHeight;
dwDIBSize += dwBmBitsSize;
// Now, since we have calculated the correct size, why don't we
// fill in the biSizeImage field (this will fix any .BMP files which
// have this field incorrect).
lpBI->biSizeImage = dwBmBitsSize;
}
// Calculate the file size by adding the DIB size to sizeof(BITMAPFILEHEADER)
bmfHdr.bfSize = dwDIBSize + sizeof(BITMAPFILEHEADER);
bmfHdr.bfReserved1 = 0;
bmfHdr.bfReserved2 = 0;
// Now, calculate the offset the actual bitmap bits will be in
// the file -- It's the Bitmap file header plus the DIB header,
// plus the size of the color table.
bmfHdr.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + lpBI->biSize +
PaletteSize((LPBYTE)lpBI);
// Write the file header
WriteFile(fh, (LPBYTE)&bmfHdr, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
// Write the DIB header and the bits -- use local version of
// MyWrite, so we can write more than 32767 bytes of data
WriteFile(fh, (LPBYTE)lpBI, dwDIBSize, &dwWritten, NULL);
GlobalUnlock(hDib);
CloseHandle(fh);
if (dwWritten == 0)
return FALSE; // oops, something happened in the write
else
return TRUE; // Success code
}
/*************************************************************************
*
* FindDIBBits()
*
* Parameter:
*
* LPBYTE lpDIB - pointer to packed-DIB memory block
*
* Return Value:
*
* LPBYTE - pointer to the DIB bits
*
* Description:
*
* This function calculates the address of the DIB's bits and returns a
* pointer to the DIB bits.
*
************************************************************************/
LPBYTE FindDIBBits(LPBYTE lpDIB)
{
return (lpDIB + *(LPDWORD)lpDIB + PaletteSize(lpDIB));
}
/*************************************************************************
*
* DIBWidth()
*
* Parameter:
*
* LPBYTE lpDIB - pointer to packed-DIB memory block
*
* Return Value:
*
* DWORD - width of the DIB
*
* Description:
*
* This function gets the width of the DIB from the BITMAPINFOHEADER
* width field if it is a Windows 3.0-style DIB or from the BITMAPCOREHEADER
* width field if it is an OS/2-style DIB.
*
************************************************************************/
DWORD DIBWidth(LPBYTE lpDIB)
{
LPBITMAPINFOHEADER lpbmi; // pointer to a Win 3.0-style DIB
LPBITMAPCOREHEADER lpbmc; // pointer to an OS/2-style DIB
// point to the header (whether Win 3.0 and OS/2)
lpbmi = (LPBITMAPINFOHEADER)lpDIB;
lpbmc = (LPBITMAPCOREHEADER)lpDIB;
// return the DIB width if it is a Win 3.0 DIB
if (lpbmi->biSize == sizeof(BITMAPINFOHEADER))
return lpbmi->biWidth;
else // it is an OS/2 DIB, so return its width
return (DWORD)lpbmc->bcWidth;
}
DWORD DIBWidth(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
DWORD dw = DIBWidth(lpDIB);
GlobalUnlock(hDIB);
return dw;
}
/*************************************************************************
*
* DIBHeight()
*
* Parameter:
*
* LPBYTE lpDIB - pointer to packed-DIB memory block
*
* Return Value:
*
* DWORD - height of the DIB
*
* Description:
*
* This function gets the height of the DIB from the BITMAPINFOHEADER
* height field if it is a Windows 3.0-style DIB or from the BITMAPCOREHEADER
* height field if it is an OS/2-style DIB.
*
************************************************************************/
DWORD DIBHeight(LPBYTE lpDIB)
{
LPBITMAPINFOHEADER lpbmi; // pointer to a Win 3.0-style DIB
LPBITMAPCOREHEADER lpbmc; // pointer to an OS/2-style DIB
// point to the header (whether OS/2 or Win 3.0
lpbmi = (LPBITMAPINFOHEADER)lpDIB;
lpbmc = (LPBITMAPCOREHEADER)lpDIB;
// return the DIB height if it is a Win 3.0 DIB
if (lpbmi->biSize == sizeof(BITMAPINFOHEADER))
return lpbmi->biHeight;
else // it is an OS/2 DIB, so return its height
return (DWORD)lpbmc->bcHeight;
}
DWORD DIBHeight(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
DWORD dw = DIBHeight(lpDIB);
GlobalUnlock(hDIB);
return dw;
}
/*************************************************************************
*
* PaletteSize()
*
* Parameter:
*
* LPBYTE lpDIB - pointer to packed-DIB memory block
*
* Return Value:
*
* WORD - size of the color palette of the DIB
*
* Description:
*
* 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 OS/2-
* style DIB).
*
************************************************************************/
WORD PaletteSize(LPBYTE lpDIB)
{
// calculate the size required by the palette
if (IS_WIN30_DIB (lpDIB))
return (DIBNumColors(lpDIB) * sizeof(RGBQUAD));
else
return (DIBNumColors(lpDIB) * sizeof(RGBTRIPLE));
}
WORD PaletteSize(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
WORD wSize = PaletteSize(lpDIB);
GlobalUnlock(hDIB);
return wSize;
}
/*************************************************************************
*
* DIBNumColors()
*
* Parameter:
*
* LPBYTE lpDIB - pointer to packed-DIB memory block
*
* Return Value:
*
* WORD - number of colors in the color table
*
* Description:
*
* 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 OS/2-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 DIBNumColors(LPBYTE lpDIB)
{
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(lpDIB))
{
DWORD dwClrUsed;
dwClrUsed = ((LPBITMAPINFOHEADER)lpDIB)->biClrUsed;
if (dwClrUsed)
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(lpDIB))
wBitCount = ((LPBITMAPINFOHEADER)lpDIB)->biBitCount;
else
wBitCount = ((LPBITMAPCOREHEADER)lpDIB)->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;
}
}
WORD DIBNumColors(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
WORD wSize = DIBNumColors(lpDIB);
GlobalUnlock(hDIB);
return wSize;
}
WORD DIBBitCount(LPBYTE lpDIB)
{
if (IS_WIN30_DIB(lpDIB))
return ((LPBITMAPINFOHEADER)lpDIB)->biBitCount;
else
return ((LPBITMAPCOREHEADER)lpDIB)->bcBitCount;
}
WORD DIBBitCount(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
WORD wSize = DIBBitCount(lpDIB);
GlobalUnlock(hDIB);
return wSize;
}
/****************************************************************************
*
* FUNCTION: BytesPerLine
*
* PURPOSE: Calculates the number of bytes in one scan line.
*
* PARAMS: LPBYTE lpDIB - pointer to the BITMAPINFOHEADER
that begins the CF_DIB block
*
* RETURNS: DWORD - number of bytes in one scan line (DWORD aligned)
*
/****************************************************************************/
DWORD BytesPerLine(LPBYTE lpDIB)
{
return WIDTHBYTES(((LPBITMAPINFOHEADER)lpDIB)->biWidth * ((LPBITMAPINFOHEADER)lpDIB)->biPlanes * ((LPBITMAPINFOHEADER)lpDIB)->biBitCount);
}
DWORD BytesPerLine(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
DWORD dw = BytesPerLine(lpDIB);
GlobalUnlock(hDIB);
return dw;
}
/****************************************************************************
*
* FUNCTION: DIBlockSize
*
* PURPOSE: Calculates the number of bytes in one scan line.
*
* PARAMS: LPBYTE lpDIB - pointer to the BITMAPINFOHEADER
that begins the CF_DIB block
*
* RETURNS: DWORD - DIB block size
*
/****************************************************************************/
DWORD DIBlockSize(LPBYTE lpDIB)
{
if (((LPBITMAPINFOHEADER)lpDIB)->biSizeImage == 0)
((LPBITMAPINFOHEADER)lpDIB)->biSizeImage = BytesPerLine(lpDIB) * ((LPBITMAPINFOHEADER)lpDIB)->biHeight;
return ((LPBITMAPINFOHEADER)lpDIB)->biSize + PaletteSize(lpDIB) + ((LPBITMAPINFOHEADER)lpDIB)->biSizeImage;
}
DWORD DIBlockSize(HDIB hDIB)
{
LPBYTE lpDIB = (LPBYTE)GlobalLock(hDIB);
DWORD dw = DIBlockSize(lpDIB);
GlobalUnlock(hDIB);
return dw;
}
/*************************************************************************
*
* CreateDIBPalette()
*
* Parameter:
*
* LPBYTE lpbi - specifies the DIB
*
* Return Value:
*
* HPALETTE - specifies the palette
*
* Description:
*
* This function creates a palette from a DIB by allocating memory for the
* logical palette, reading and storing the colors from the DIB's color table
* into the logical palette, creating a palette from this logical palette,
* and then returning the palette's handle. This allows the DIB to be
* displayed using the best possible colors (important for DIBs with 256 or
* more colors).
*
************************************************************************/
HPALETTE CreateDIBPalette(LPBYTE lpbi)
{
LPLOGPALETTE lpPal; // pointer to a logical palette
HANDLE hLogPal; // handle to a logical palette
HPALETTE hPal = NULL; // handle to a palette
int i, wNumColors; // loop index, number of colors in color table
LPBITMAPINFO lpbmi; // pointer to BITMAPINFO structure (Win3.0)
LPBITMAPCOREINFO lpbmc; // pointer to BITMAPCOREINFO structure (OS/2)
BOOL bWinStyleDIB; // Win3.0 DIB?
// if handle to DIB is invalid, return NULL
if (! lpbi)
return NULL;
// get pointer to BITMAPINFO (Win 3.0)
lpbmi = (LPBITMAPINFO)lpbi;
// get pointer to BITMAPCOREINFO (OS/2 1.x)
lpbmc = (LPBITMAPCOREINFO)lpbi;
// get the number of colors in the DIB
wNumColors = DIBNumColors(lpbi);
// is this a Win 3.0 DIB?
bWinStyleDIB = IS_WIN30_DIB(lpbi);
if (wNumColors)
{
// allocate memory block for logical palette
hLogPal = GlobalAlloc(GHND, sizeof(LOGPALETTE) +
sizeof(PALETTEENTRY) * wNumColors);
// if not enough memory, clean up and return NULL
if (!hLogPal)
return NULL;
// lock memory block and get pointer to it
lpPal = (LPLOGPALETTE)GlobalLock(hLogPal);
// set version and number of palette entries
lpPal->palVersion = PALVERSION;
lpPal->palNumEntries = wNumColors;
// store RGB triples (if Win 3.0 DIB) or RGB quads (if OS/2 DIB)
// into palette
for (i = 0; i < wNumColors; i++)
{
if (bWinStyleDIB)
{
lpPal->palPalEntry[i].peRed = lpbmi->bmiColors[i].rgbRed;
lpPal->palPalEntry[i].peGreen = lpbmi->bmiColors[i].rgbGreen;
lpPal->palPalEntry[i].peBlue = lpbmi->bmiColors[i].rgbBlue;
lpPal->palPalEntry[i].peFlags = 0;
}
else
{
lpPal->palPalEntry[i].peRed = lpbmc->bmciColors[i].rgbtRed;
lpPal->palPalEntry[i].peGreen = lpbmc->bmciColors[i].rgbtGreen;
lpPal->palPalEntry[i].peBlue = lpbmc->bmciColors[i].rgbtBlue;
lpPal->palPalEntry[i].peFlags = 0;
}
}
// create the palette and get handle to it
hPal = CreatePalette(lpPal);
// if error getting handle to palette, clean up and return NULL
if (!hPal)
{
GlobalUnlock(hLogPal);
GlobalFree(hLogPal);
return NULL;
}
}
// return handle to DIB's palette
return hPal;
}
/*************************************************************************
*
* CreateDIBPalette()
*
* Parameter:
*
* HDIB hDIB - specifies the DIB
*
* Return Value:
*
* HPALETTE - specifies the palette
*
* Description:
*
* This function creates a palette from a DIB by allocating memory for the
* logical palette, reading and storing the colors from the DIB's color table
* into the logical palette, creating a palette from this logical palette,
* and then returning the palette's handle. This allows the DIB to be
* displayed using the best possible colors (important for DIBs with 256 or
* more colors).
*
************************************************************************/
HPALETTE CreateDIBPalette(HDIB hDIB)
{
HPALETTE hPal = NULL; // handle to a palette
LPBYTE lpbi; // pointer to packed-DIB
// if handle to DIB is invalid, return NULL
if (!hDIB)
return NULL;
// lock DIB memory block and get a pointer to it
lpbi = (LPBYTE)GlobalLock(hDIB);
hPal = CreateDIBPalette(lpbi);
// Unlock hDIB
GlobalUnlock(hDIB);
// return handle to DIB's palette
return hPal;
}
/*************************************************************************
*
* DIBToBitmap()
*
* Parameters:
*
* HDIB hDIB - specifies the DIB to convert
*
* HPALETTE hPal - specifies the palette to use with the bitmap
*
* Return Value:
*
* HBITMAP - identifies the device-dependent bitmap
*
* Description:
*
* This function creates a bitmap from a DIB using the specified palette.
* If no palette is specified, default is used.
*
* NOTE:
*
* The bitmap returned from this funciton is always a bitmap compatible
* with the screen (e.g. same bits/pixel and color planes) rather than
* a bitmap with the same attributes as the DIB. This behavior is by
* design, and occurs because this function calls CreateDIBitmap to
* do its work, and CreateDIBitmap always creates a bitmap compatible
* with the hDC parameter passed in (because it in turn calls
* CreateCompatibleBitmap).
*
* So for instance, if your DIB is a monochrome DIB and you call this
* function, you will not get back a monochrome HBITMAP -- you will
* get an HBITMAP compatible with the screen DC, but with only 2
* colors used in the bitmap.
*
* If your application requires a monochrome HBITMAP returned for a
* monochrome DIB, use the function SetDIBits().
*
* Also, the DIBpassed in to the function is not destroyed on exit. This
* must be done later, once it is no longer needed.
*
************************************************************************/
HBITMAP DIBToBitmap(HDIB hDIB, HPALETTE hPal)
{
LPBYTE lpDIBHdr, lpDIBBits; // pointer to DIB header, pointer to DIB bits
HBITMAP hBitmap; // handle to device-dependent bitmap
HDC hDC; // handle to DC
HPALETTE hOldPal = NULL; // handle to a palette
// if invalid handle, return NULL
if (!hDIB)
return NULL;
// lock memory block and get a pointer to it
lpDIBHdr = (LPBYTE)GlobalLock(hDIB);
// get a pointer to the DIB bits
lpDIBBits = FindDIBBits(lpDIBHdr);
// get a DC
hDC = GetDC(NULL);
if (!hDC)
{
// clean up and return NULL
GlobalUnlock(hDIB);
return NULL;
}
// select and realize palette
if (hPal)
{
hOldPal = SelectPalette(hDC, hPal, FALSE);
RealizePalette(hDC);
}
// create bitmap from DIB info and bits
hBitmap = CreateDIBitmap(hDC,
(LPBITMAPINFOHEADER)lpDIBHdr,
CBM_INIT,
lpDIBBits,
(LPBITMAPINFO)lpDIBHdr,
DIB_RGB_COLORS);
// restore previous palette
if (hOldPal)
SelectPalette(hDC, hOldPal, FALSE);
// clean up
ReleaseDC(NULL, hDC);
GlobalUnlock(hDIB);
// return handle to the bitmap
return hBitmap;
}
/*************************************************************************
*
* BitmapToDIB()
*
* Parameters:
*
* HBITMAP hBitmap - specifies the bitmap to convert
*
* HPALETTE hPal - specifies the palette to use with the bitmap
*
* Return Value:
*
* HDIB - identifies the device-dependent bitmap
*
* Description:
*
* This function creates a DIB from a bitmap using the specified palette.
*
************************************************************************/
HDIB BitmapToDIB(HBITMAP hBitmap, HPALETTE hPal)
{
BITMAP bm; // bitmap structure
BITMAPINFOHEADER bi; // bitmap header
LPBITMAPINFOHEADER lpbi; // pointer to BITMAPINFOHEADER
DWORD dwLen; // size of memory block
HANDLE hDIB, h; // handle to DIB, temp handle
HDC hDC; // handle to DC
WORD biBits; // bits per pixel
// check if bitmap handle is valid
if (!hBitmap)
return NULL;
// fill in BITMAP structure, return NULL if it didn't work
if (!GetObject(hBitmap, sizeof(bm), (LPBYTE)&bm))
return NULL;
// if no palette is specified, use default palette
if (hPal == NULL)
hPal = (HPALETTE)GetStockObject(DEFAULT_PALETTE);
// calculate bits per pixel
biBits = bm.bmPlanes * bm.bmBitsPixel;
// make sure bits per pixel is valid
if (biBits <= 1)
biBits = 1;
else if (biBits <= 4)
biBits = 4;
else if (biBits <= 8)
biBits = 8;
else // if greater than 8-bit, force to 24-bit
biBits = 24;
// initialize BITMAPINFOHEADER
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biCompression = BI_RGB;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
// calculate size of memory block required to store BITMAPINFO
dwLen = bi.biSize + PaletteSize((LPBYTE)&bi);
// get a DC
hDC = GetDC(NULL);
// select and realize our palette
hPal = SelectPalette(hDC, hPal, FALSE);
RealizePalette(hDC);
// alloc memory block to store our bitmap
hDIB = GlobalAlloc(GHND, dwLen);
// if we couldn't get memory block
if (!hDIB)
{
// clean up and return NULL
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
return NULL;
}
// lock memory and get pointer to it
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
/// use our bitmap info. to fill BITMAPINFOHEADER
*lpbi = bi;
// call GetDIBits with a NULL lpBits param, so it will calculate the
// biSizeImage field for us
GetDIBits(hDC, hBitmap, 0, (UINT)bi.biHeight, NULL, (LPBITMAPINFO)lpbi,
DIB_RGB_COLORS);
// get the info. returned by GetDIBits and unlock memory block
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;
// realloc the buffer big enough to hold all the bits
dwLen = bi.biSize + PaletteSize((LPBYTE)&bi) + bi.biSizeImage;
if (h = GlobalReAlloc(hDIB, dwLen, 0))
hDIB = h;
else
{
// clean up and return NULL
GlobalFree(hDIB);
hDIB = NULL;
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
return NULL;
}
// lock memory block and get pointer to it */
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
// call GetDIBits with a NON-NULL lpBits param, and actualy get the
// bits this time
if (GetDIBits(hDC, hBitmap, 0, (UINT)bi.biHeight, (LPBYTE)lpbi +
(WORD)lpbi->biSize + PaletteSize((LPBYTE)lpbi), (LPBITMAPINFO)lpbi,
DIB_RGB_COLORS) == 0)
{
// clean up and return NULL
GlobalUnlock(hDIB);
hDIB = NULL;
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
return NULL;
}
bi = *lpbi;
// clean up
GlobalUnlock(hDIB);
SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
// return handle to the DIB
return hDIB;
}
/*************************************************************************
*
* BitmapToDIB()
*
* Parameters:
*
* HBITMAP hBitmap - specifies the bitmap to convert
*
* HPALETTE hPal - specifies the palette to use with the bitmap
*
* WORD wBitCount - specifies the DIB colorbits
*
* Return Value:
*
* HDIB - identifies the device-dependent bitmap
*
* Description:
*
* This function creates a DIB from a bitmap using the specified palette.
*
************************************************************************/
HDIB BitmapToDIB(HBITMAP hBitmap, HPALETTE hPalette, WORD wBitCount)
{
HDIB hNewDib;
if (! hBitmap)
return NULL;
// get bitmap info
BITMAP bm; // bitmap structure
GetObject(hBitmap, sizeof(bm), (LPBYTE)&bm);
int biBits = bm.bmPlanes * bm.bmBitsPixel;
// make sure bits per pixel is valid
if (biBits <= 1)
biBits = 1;
else if (biBits <= 4)
biBits = 4;
else if (biBits <= 8)
biBits = 8;
else // if greater than 8-bit, force to 24-bit
biBits = 24;
// get DIB handle from current bitmap
HDIB hDib = BitmapToDIB(hBitmap, hPalette);
if (! hDib)
return NULL;
if (wBitCount == biBits)
hNewDib = hDib;
else
{
// DIB bits/pixel is not the same as device
// convert dib format to accordingly
hNewDib = ConvertDIBFormat(hDib, wBitCount, hPalette);
// cleanup hDib
GlobalFree(hDib);
}
return hNewDib;
}
/*************************************************************************
*
* ChangeBitmapFormat()
*
* Parameter:
*
* HBITMAP - handle to a bitmap
*
* WORD - desired bits per pixel
*
* DWORD - desired compression format
*
* HPALETTE - handle to palette
*
* Return Value:
*
* HDIB - handle to the new DIB if successful, else NULL
*
* Description:
*
* This function will convert a bitmap to the specified bits per pixel
* and compression format. The bitmap and it's palette will remain
* after calling this function.
*
************************************************************************/
HDIB ChangeBitmapFormat (HBITMAP hbm, WORD biBits, DWORD biCompression, 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),(LPBYTE)&bm);
if (biBits == 0)
{
biBits = bm.bmPlanes * bm.bmBitsPixel;
// make sure bits per pixel is valid
if (biBits <= 1)
biBits = 1;
else if (biBits <= 4)
biBits = 4;
else if (biBits <= 8)
biBits = 8;
else // if greater than 8-bit, force to 24-bit
biBits = 24;
}
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biCompression = biCompression;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwLen = bi.biSize + PaletteSize((LPBYTE)&bi);
hdc = GetDC(NULL);
HPALETTE hpalT = SelectPalette(hdc,hpal,FALSE);
RealizePalette(hdc);
hdib = GlobalAlloc(GHND,dwLen);
if (!hdib)
{
SelectPalette(hdc,hpalT,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, 0L, (DWORD)bi.biHeight,
(LPBYTE)NULL, (LPBITMAPINFO)lpbi, (DWORD)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 (biCompression != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
}
/* realloc the buffer big enough to hold all the bits */
dwLen = bi.biSize + PaletteSize((LPBYTE)&bi) + bi.biSizeImage;
if (h = GlobalReAlloc(hdib,dwLen,0))
hdib = h;
else
{
GlobalFree(hdib);
hdib = NULL;
SelectPalette(hdc,hpalT,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,
0L,
(DWORD)bi.biHeight,
(LPBYTE)lpbi + (WORD)lpbi->biSize + PaletteSize((LPBYTE)lpbi),
(LPBITMAPINFO)lpbi,
(DWORD)DIB_RGB_COLORS))
{
GlobalUnlock(hdib);
hdib = NULL;
SelectPalette(hdc,hpalT,FALSE);
ReleaseDC(NULL,hdc);
return NULL;
}
bi = *lpbi;
GlobalUnlock(hdib);
SelectPalette(hdc,hpalT,FALSE);
ReleaseDC(NULL,hdc);
return hdib;
}
/*************************************************************************
*
* ChangeDIBFormat()
*
* Parameter:
*
* HDIB - handle to packed-DIB in memory
*
* WORD - desired bits per pixel
*
* DWORD - desired compression format
*
* Return Value:
*
* HDIB - handle to the new DIB if successful, else NULL
*
* Description:
*
* This function will convert the bits per pixel and/or the compression
* format of the specified DIB. Note: If the conversion was unsuccessful,
* we return NULL. The original DIB is left alone. Don't use code like the
* following:
*
* hMyDIB = ChangeDIBFormat(hMyDIB, 8, BI_RLE4);
*
* The conversion will fail, but hMyDIB will now be NULL and the original
* DIB will now hang around in memory. We could have returned the old
* DIB, but we wanted to allow the programmer to check whether this
* conversion succeeded or failed.
*
************************************************************************/
HDIB ChangeDIBFormat(HDIB hDIB, WORD wBitCount, DWORD dwCompression)
{
HBITMAP hBitmap; // Handle to bitmap
HDIB hNewDIB = NULL; // Handle to new DIB
HPALETTE hPal; // Handle to palette
// Check for a valid DIB handle
if (!hDIB)
return NULL;
// Save the old DIB's palette
hPal = CreateDIBPalette(hDIB);
if (hPal == NULL)
hPal = (HPALETTE)GetStockObject(DEFAULT_PALETTE);
// Convert old DIB to a bitmap
hBitmap = DIBToBitmap(hDIB, hPal);
if (!hBitmap)
{
DeleteObject(hPal);
return NULL;
}
// Change bitmap format
hNewDIB = ChangeBitmapFormat(hBitmap, wBitCount, dwCompression, hPal);
// Clean up and return
DeleteObject(hBitmap);
DeleteObject(hPal);
return hNewDIB;
}
/****************************************************************************
*
* FUNCTION: ConvertDIBFormat
*
* PURPOSE: Creates a new DIB of the requested format, copies the source
* image to the new DIB.
*
* PARAMS: LPBITMAPINFO lpSrcDIB - the source CF_DIB
* UINT nWidth - width for new DIB
* UINT nHeight - height for new DIB
* UINT nbpp - bpp for new DIB
* BOOL bStretch - TRUE to stretch source to dest
* FALSE to take upper left of image
* HPALETTE hPalSrc - Palette used to set new DIB
* DWORD dwSize - return the size of new DIB pointer
*
* RETURNS: HDIB - Handle of CF_DIB memory block with new image
* NULL on failure
*
/****************************************************************************/
HDIB ConvertDIBFormat(LPBYTE lpDIB, UINT nWidth, UINT nHeight, UINT nbpp, BOOL bStretch, HPALETTE hPalSrc)
{
LPBITMAPINFO lpSrcDIB = (LPBITMAPINFO)lpDIB;
LPBITMAPINFO lpbmi = NULL;
LPBYTE lpSourceBits, lpTargetBits, lpResult;
HDC hDC = NULL, hSourceDC, hTargetDC;
HBITMAP hSourceBitmap, hTargetBitmap, hOldTargetBitmap, hOldSourceBitmap;
DWORD dwSourceBitsSize, dwTargetBitsSize, dwTargetHeaderSize, dwColorNum;
HDIB hDib;
// Allocate and fill out a BITMAPINFO struct for the new DIB
if (nbpp <= 8)
dwColorNum = 1 << nbpp;
else
dwColorNum = 0;
dwTargetHeaderSize = sizeof( BITMAPINFO ) + ( dwColorNum * sizeof( RGBQUAD ) );
lpbmi = (LPBITMAPINFO)malloc( dwTargetHeaderSize );
lpbmi->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
lpbmi->bmiHeader.biWidth = nWidth;
lpbmi->bmiHeader.biHeight = nHeight;
lpbmi->bmiHeader.biPlanes = 1;
lpbmi->bmiHeader.biBitCount = nbpp;
lpbmi->bmiHeader.biCompression = BI_RGB;
lpbmi->bmiHeader.biSizeImage = 0;
lpbmi->bmiHeader.biXPelsPerMeter = 0;
lpbmi->bmiHeader.biYPelsPerMeter = 0;
lpbmi->bmiHeader.biClrUsed = 0;
lpbmi->bmiHeader.biClrImportant = 0;
// Fill in the color table
if( ! CopyColorTable( lpbmi, (LPBITMAPINFO)lpSrcDIB, hPalSrc ) )
{
free( lpbmi );
return NULL;
}
// Gonna use DIBSections and BitBlt() to do the conversion, so make 'em
hDC = GetDC( NULL );
hTargetBitmap = CreateDIBSection( hDC, lpbmi, DIB_RGB_COLORS, (VOID **)&lpTargetBits, NULL, 0 );
hSourceBitmap = CreateDIBSection( hDC, lpSrcDIB, DIB_RGB_COLORS, (VOID **)&lpSourceBits, NULL, 0 );
hSourceDC = CreateCompatibleDC( hDC );
hTargetDC = CreateCompatibleDC( hDC );
// Flip the bits on the source DIBSection to match the source DIB
dwSourceBitsSize = lpSrcDIB->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpSrcDIB->bmiHeader));
dwTargetBitsSize = lpbmi->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpbmi->bmiHeader));
memcpy( lpSourceBits, FindDIBBits((LPBYTE)lpSrcDIB), dwSourceBitsSize );
lpbmi->bmiHeader.biSizeImage = dwTargetBitsSize;
// Select DIBSections into DCs
hOldSourceBitmap = (HBITMAP)SelectObject( hSourceDC, hSourceBitmap );
hOldTargetBitmap = (HBITMAP)SelectObject( hTargetDC, hTargetBitmap );
// Set the color tables for the DIBSections
if( lpSrcDIB->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hSourceDC, 0, 1 << lpSrcDIB->bmiHeader.biBitCount, lpSrcDIB->bmiColors );
if( lpbmi->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hTargetDC, 0, 1 << lpbmi->bmiHeader.biBitCount, lpbmi->bmiColors );
// If we are asking for a straight copy, do it
if( (lpSrcDIB->bmiHeader.biWidth==lpbmi->bmiHeader.biWidth) && (lpSrcDIB->bmiHeader.biHeight==lpbmi->bmiHeader.biHeight) )
{
BitBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, SRCCOPY );
}
else
{
// else, should we stretch it?
if( bStretch )
{
SetStretchBltMode( hTargetDC, COLORONCOLOR );
StretchBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, lpSrcDIB->bmiHeader.biWidth, lpSrcDIB->bmiHeader.biHeight, SRCCOPY );
}
else
{
// or just take the upper left corner of the source
BitBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, SRCCOPY );
}
}
// Clean up and delete the DCs
SelectObject( hSourceDC, hOldSourceBitmap );
SelectObject( hTargetDC, hOldTargetBitmap );
DeleteDC( hSourceDC );
DeleteDC( hTargetDC );
ReleaseDC( NULL, hDC );
// Flush the GDI batch, so we can play with the bits
GdiFlush();
// Allocate enough memory for the new CF_DIB, and copy bits
hDib = GlobalAlloc(GHND, dwTargetHeaderSize + dwTargetBitsSize );
lpResult = (LPBYTE)GlobalLock(hDib);
memcpy( lpResult, lpbmi, dwTargetHeaderSize );
memcpy( FindDIBBits( (LPBYTE)lpResult ), lpTargetBits, dwTargetBitsSize );
// final cleanup
DeleteObject( hTargetBitmap );
DeleteObject( hSourceBitmap );
free( lpbmi );
GlobalUnlock(hDib);
return hDib;
}
/* End ConvertDIBFormat() 1***************************************************/
/****************************************************************************
*
* FUNCTION: ConvertDIBFormat
*
* PURPOSE: Creates a new DIB of the requested format, copies the source
* image to the new DIB.
*
* PARAMS: HDIB hDIB - the source CF_DIB
* UINT nWidth - width for new DIB
* UINT nHeight - height for new DIB
* UINT nbpp - bpp for new DIB
* BOOL bStretch - TRUE to stretch source to dest
* FALSE to take upper left of image
* HPALETTE hPalSrc - Palette used to set new DIB
*
* RETURNS: HDIB - new CF_DIB handle
*
/****************************************************************************/
HDIB ConvertDIBFormat(HDIB hDIB, UINT nWidth, UINT nHeight, UINT nbpp, BOOL bStretch, HPALETTE hPalSrc)
{
LPBITMAPINFO lpbmi = NULL;
LPBYTE lpSourceBits, lpTargetBits, lpResult;
HDC hDC = NULL, hSourceDC, hTargetDC;
HBITMAP hSourceBitmap, hTargetBitmap, hOldTargetBitmap, hOldSourceBitmap;
DWORD dwSourceBitsSize, dwTargetBitsSize, dwTargetHeaderSize, dwColorNum;
HDIB hNewDIB;
DWORD dwSize;
// Get DIB pointer
if (! hDIB)
return NULL;
LPBITMAPINFO lpSrcDIB = (LPBITMAPINFO)GlobalLock(hDIB);
if (! lpSrcDIB)
return NULL;
// Allocate and fill out a BITMAPINFO struct for the new DIB
if (nbpp <= 8)
dwColorNum = 1 << nbpp;
else
dwColorNum = 0;
dwTargetHeaderSize = sizeof( BITMAPINFO ) + ( dwColorNum * sizeof( RGBQUAD ) );
lpbmi = (LPBITMAPINFO)malloc( dwTargetHeaderSize );
lpbmi->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
lpbmi->bmiHeader.biWidth = nWidth;
lpbmi->bmiHeader.biHeight = nHeight;
lpbmi->bmiHeader.biPlanes = 1;
lpbmi->bmiHeader.biBitCount = nbpp;
lpbmi->bmiHeader.biCompression = BI_RGB;
lpbmi->bmiHeader.biSizeImage = 0;
lpbmi->bmiHeader.biXPelsPerMeter = 0;
lpbmi->bmiHeader.biYPelsPerMeter = 0;
lpbmi->bmiHeader.biClrUsed = 0;
lpbmi->bmiHeader.biClrImportant = 0;
// Fill in the color table
if( ! CopyColorTable( lpbmi, (LPBITMAPINFO)lpSrcDIB, hPalSrc ) )
{
free( lpbmi );
return NULL;
}
// Gonna use DIBSections and BitBlt() to do the conversion, so make 'em
hDC = GetDC( NULL );
hTargetBitmap = CreateDIBSection( hDC, lpbmi, DIB_RGB_COLORS, (VOID **)&lpTargetBits, NULL, 0 );
hSourceBitmap = CreateDIBSection( hDC, lpSrcDIB, DIB_RGB_COLORS, (VOID **)&lpSourceBits, NULL, 0 );
hSourceDC = CreateCompatibleDC( hDC );
hTargetDC = CreateCompatibleDC( hDC );
// Flip the bits on the source DIBSection to match the source DIB
dwSourceBitsSize = lpSrcDIB->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpSrcDIB->bmiHeader));
dwTargetBitsSize = lpbmi->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpbmi->bmiHeader));
memcpy( lpSourceBits, FindDIBBits((LPBYTE)lpSrcDIB), dwSourceBitsSize );
lpbmi->bmiHeader.biSizeImage = dwTargetBitsSize;
// Select DIBSections into DCs
hOldSourceBitmap = (HBITMAP)SelectObject( hSourceDC, hSourceBitmap );
hOldTargetBitmap = (HBITMAP)SelectObject( hTargetDC, hTargetBitmap );
// Set the color tables for the DIBSections
if( lpSrcDIB->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hSourceDC, 0, 1 << lpSrcDIB->bmiHeader.biBitCount, lpSrcDIB->bmiColors );
if( lpbmi->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hTargetDC, 0, 1 << lpbmi->bmiHeader.biBitCount, lpbmi->bmiColors );
// If we are asking for a straight copy, do it
if( (lpSrcDIB->bmiHeader.biWidth==lpbmi->bmiHeader.biWidth) && (lpSrcDIB->bmiHeader.biHeight==lpbmi->bmiHeader.biHeight) )
{
BitBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, SRCCOPY );
}
else
{
// else, should we stretch it?
if( bStretch )
{
SetStretchBltMode( hTargetDC, COLORONCOLOR );
StretchBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, lpSrcDIB->bmiHeader.biWidth, lpSrcDIB->bmiHeader.biHeight, SRCCOPY );
}
else
{
// or just take the upper left corner of the source
BitBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, SRCCOPY );
}
}
// Clean up and delete the DCs
SelectObject( hSourceDC, hOldSourceBitmap );
SelectObject( hTargetDC, hOldTargetBitmap );
DeleteDC( hSourceDC );
DeleteDC( hTargetDC );
ReleaseDC( NULL, hDC );
// Flush the GDI batch, so we can play with the bits
GdiFlush();
// Allocate enough memory for the new CF_DIB, and copy bits
dwSize = dwTargetHeaderSize + dwTargetBitsSize;
hNewDIB = GlobalAlloc(GHND, dwSize);
lpResult = (LPBYTE)GlobalLock(hNewDIB);//malloc( dwTargetHeaderSize + dwTargetBitsSize );
memcpy( lpResult, lpbmi, dwTargetHeaderSize );
memcpy( FindDIBBits( (LPBYTE)lpResult ), lpTargetBits, dwTargetBitsSize );
// final cleanup
DeleteObject( hTargetBitmap );
DeleteObject( hSourceBitmap );
free( lpbmi );
GlobalUnlock(hDIB);
GlobalUnlock(hNewDIB);
return hNewDIB;
}
/* End ConvertDIBFormat() 2***************************************************/
/****************************************************************************
*
* FUNCTION: ConvertDIBFormat
*
* PURPOSE: Creates a new DIB of the requested format, copies the source
* image to the new DIB.
*
* PARAMS: LPBYTE lpDIB - the source CF_DIB
* UINT nbpp - bpp for new DIB
* HPALETTE hPalSrc - Palette used to set new DIB
*
* RETURNS: HDIB - new CF_DIB handle
*
/****************************************************************************/
HDIB ConvertDIBFormat(LPBYTE lpDIB, UINT nbpp, HPALETTE hPalSrc)
{
LPBITMAPINFO lpSrcDIB = (LPBITMAPINFO)lpDIB;
LPBITMAPINFO lpbmi = NULL;
LPBYTE lpSourceBits, lpTargetBits, lpResult;
HDC hDC = NULL, hSourceDC, hTargetDC;
HBITMAP hSourceBitmap, hTargetBitmap, hOldTargetBitmap, hOldSourceBitmap;
DWORD dwSourceBitsSize, dwTargetBitsSize, dwTargetHeaderSize, dwColorNum;
HDIB hNewDIB;
DWORD dwSize;
int nWidth, nHeight;
nWidth = lpSrcDIB->bmiHeader.biWidth;
nHeight = lpSrcDIB->bmiHeader.biHeight;
// Allocate and fill out a BITMAPINFO struct for the new DIB
if (nbpp <= 8)
dwColorNum = 1 << nbpp;
else
dwColorNum = 0;
dwTargetHeaderSize = sizeof( BITMAPINFO ) + ( dwColorNum * sizeof( RGBQUAD ) );
lpbmi = (LPBITMAPINFO)malloc( dwTargetHeaderSize );
lpbmi->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
lpbmi->bmiHeader.biWidth = nWidth;
lpbmi->bmiHeader.biHeight = nHeight;
lpbmi->bmiHeader.biPlanes = 1;
lpbmi->bmiHeader.biBitCount = nbpp;
lpbmi->bmiHeader.biCompression = BI_RGB;
lpbmi->bmiHeader.biSizeImage = 0;
lpbmi->bmiHeader.biXPelsPerMeter = 0;
lpbmi->bmiHeader.biYPelsPerMeter = 0;
lpbmi->bmiHeader.biClrUsed = 0;
lpbmi->bmiHeader.biClrImportant = 0;
// Fill in the color table
if( ! CopyColorTable( lpbmi, (LPBITMAPINFO)lpSrcDIB, hPalSrc ) )
{
free( lpbmi );
return NULL;
}
// Gonna use DIBSections and BitBlt() to do the conversion, so make 'em
hDC = GetDC( NULL );
hTargetBitmap = CreateDIBSection( hDC, lpbmi, DIB_RGB_COLORS, (VOID **)&lpTargetBits, NULL, 0 );
hSourceBitmap = CreateDIBSection( hDC, lpSrcDIB, DIB_RGB_COLORS, (VOID **)&lpSourceBits, NULL, 0 );
hSourceDC = CreateCompatibleDC( hDC );
hTargetDC = CreateCompatibleDC( hDC );
// Flip the bits on the source DIBSection to match the source DIB
dwSourceBitsSize = lpSrcDIB->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpSrcDIB->bmiHeader));
dwTargetBitsSize = lpbmi->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpbmi->bmiHeader));
memcpy( lpSourceBits, FindDIBBits((LPBYTE)lpSrcDIB), dwSourceBitsSize );
lpbmi->bmiHeader.biSizeImage = dwTargetBitsSize;
// Select DIBSections into DCs
hOldSourceBitmap = (HBITMAP)SelectObject( hSourceDC, hSourceBitmap );
hOldTargetBitmap = (HBITMAP)SelectObject( hTargetDC, hTargetBitmap );
// Set the color tables for the DIBSections
if( lpSrcDIB->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hSourceDC, 0, 1 << lpSrcDIB->bmiHeader.biBitCount, lpSrcDIB->bmiColors );
if( lpbmi->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hTargetDC, 0, 1 << lpbmi->bmiHeader.biBitCount, lpbmi->bmiColors );
// We are asking for a straight copy, do it
BitBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, SRCCOPY );
// Clean up and delete the DCs
SelectObject( hSourceDC, hOldSourceBitmap );
SelectObject( hTargetDC, hOldTargetBitmap );
DeleteDC( hSourceDC );
DeleteDC( hTargetDC );
ReleaseDC( NULL, hDC );
// Flush the GDI batch, so we can play with the bits
GdiFlush();
// Allocate enough memory for the new CF_DIB, and copy bits
dwSize = dwTargetHeaderSize + dwTargetBitsSize;
hNewDIB = GlobalAlloc(GHND, dwSize);
lpResult = (LPBYTE)GlobalLock(hNewDIB);//malloc( dwTargetHeaderSize + dwTargetBitsSize );
memcpy( lpResult, lpbmi, dwTargetHeaderSize );
memcpy( FindDIBBits( (LPBYTE)lpResult ), lpTargetBits, dwTargetBitsSize );
// final cleanup
DeleteObject( hTargetBitmap );
DeleteObject( hSourceBitmap );
free( lpbmi );
GlobalUnlock(hNewDIB);
return hNewDIB;
}
/* End ConvertDIBFormat() 3***************************************************/
/****************************************************************************
*
* FUNCTION: ConvertDIBFormat
*
* PURPOSE: Creates a new DIB of the requested format, copies the source
* image to the new DIB.
*
* PARAMS: HDIB hDIB - the source CF_DIB
* UINT nbpp - bpp for new DIB
* HPALETTE hPalSrc - Palette used to set new DIB
*
* RETURNS: HDIB - new CF_DIB handle
*
/****************************************************************************/
HDIB ConvertDIBFormat(HDIB hDIB, UINT nbpp, HPALETTE hPalSrc)
{
LPBITMAPINFO lpbmi = NULL;
LPBYTE lpSourceBits, lpTargetBits, lpResult;
HDC hDC = NULL, hSourceDC, hTargetDC;
HBITMAP hSourceBitmap, hTargetBitmap, hOldTargetBitmap, hOldSourceBitmap;
DWORD dwSourceBitsSize, dwTargetBitsSize, dwTargetHeaderSize, dwColorNum;
HANDLE hNewDIB;
DWORD dwSize;
int nWidth, nHeight;
// Get DIB pointer
if (! hDIB)
return NULL;
LPBITMAPINFO lpSrcDIB = (LPBITMAPINFO)GlobalLock(hDIB);
if (! lpSrcDIB)
return NULL;
nWidth = lpSrcDIB->bmiHeader.biWidth;
nHeight = lpSrcDIB->bmiHeader.biHeight;
// Allocate and fill out a BITMAPINFO struct for the new DIB
if (nbpp <= 8)
dwColorNum = 1 << nbpp;
else
dwColorNum = 0;
dwTargetHeaderSize = sizeof( BITMAPINFO ) + ( dwColorNum * sizeof( RGBQUAD ) );
lpbmi = (LPBITMAPINFO)malloc( dwTargetHeaderSize );
lpbmi->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
lpbmi->bmiHeader.biWidth = nWidth;
lpbmi->bmiHeader.biHeight = nHeight;
lpbmi->bmiHeader.biPlanes = 1;
lpbmi->bmiHeader.biBitCount = nbpp;
lpbmi->bmiHeader.biCompression = BI_RGB;
lpbmi->bmiHeader.biSizeImage = 0;
lpbmi->bmiHeader.biXPelsPerMeter = 0;
lpbmi->bmiHeader.biYPelsPerMeter = 0;
lpbmi->bmiHeader.biClrUsed = 0;
lpbmi->bmiHeader.biClrImportant = 0;
// Fill in the color table
if( ! CopyColorTable( lpbmi, (LPBITMAPINFO)lpSrcDIB, hPalSrc ) )
{
free( lpbmi );
return NULL;
}
// Gonna use DIBSections and BitBlt() to do the conversion, so make 'em
hDC = GetDC( NULL );
hTargetBitmap = CreateDIBSection( hDC, lpbmi, DIB_RGB_COLORS, (VOID **)&lpTargetBits, NULL, 0 );
hSourceBitmap = CreateDIBSection( hDC, lpSrcDIB, DIB_RGB_COLORS, (VOID **)&lpSourceBits, NULL, 0 );
hSourceDC = CreateCompatibleDC( hDC );
hTargetDC = CreateCompatibleDC( hDC );
// Flip the bits on the source DIBSection to match the source DIB
dwSourceBitsSize = lpSrcDIB->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpSrcDIB->bmiHeader));
dwTargetBitsSize = lpbmi->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpbmi->bmiHeader));
memcpy( lpSourceBits, FindDIBBits((LPBYTE)lpSrcDIB), dwSourceBitsSize );
lpbmi->bmiHeader.biSizeImage = dwTargetBitsSize;
// Select DIBSections into DCs
hOldSourceBitmap = (HBITMAP)SelectObject( hSourceDC, hSourceBitmap );
hOldTargetBitmap = (HBITMAP)SelectObject( hTargetDC, hTargetBitmap );
// Set the color tables for the DIBSections
if( lpSrcDIB->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hSourceDC, 0, 1 << lpSrcDIB->bmiHeader.biBitCount, lpSrcDIB->bmiColors );
if( lpbmi->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hTargetDC, 0, 1 << lpbmi->bmiHeader.biBitCount, lpbmi->bmiColors );
// We are asking for a straight copy, do it
BitBlt( hTargetDC, 0, 0, lpbmi->bmiHeader.biWidth, lpbmi->bmiHeader.biHeight, hSourceDC, 0, 0, SRCCOPY );
// Clean up and delete the DCs
SelectObject( hSourceDC, hOldSourceBitmap );
SelectObject( hTargetDC, hOldTargetBitmap );
DeleteDC( hSourceDC );
DeleteDC( hTargetDC );
ReleaseDC( NULL, hDC );
// Flush the GDI batch, so we can play with the bits
GdiFlush();
// Allocate enough memory for the new CF_DIB, and copy bits
dwSize = dwTargetHeaderSize + dwTargetBitsSize;
hNewDIB = GlobalAlloc(GHND, dwSize);
lpResult = (LPBYTE)GlobalLock(hNewDIB);//malloc( dwTargetHeaderSize + dwTargetBitsSize );
memcpy( lpResult, lpbmi, dwTargetHeaderSize );
memcpy( FindDIBBits( (LPBYTE)lpResult ), lpTargetBits, dwTargetBitsSize );
// final cleanup
DeleteObject( hTargetBitmap );
DeleteObject( hSourceBitmap );
free( lpbmi );
GlobalUnlock(hDIB);
GlobalUnlock(hNewDIB);
return hNewDIB;
}
/* End ConvertDIBFormat() 4***************************************************/
/****************************************************************************
*
* FUNCTION: CopyColorTable
*
* PURPOSE: Copies the color table from one CF_DIB to another.
*
* PARAMS: LPBITMAPINFO lpTarget - pointer to target DIB
* LPBITMAPINFO lpSource - pointer to source DIB
*
* RETURNS: BOOL - TRUE for success, FALSE for failure
*
/****************************************************************************/
BOOL CopyColorTable( LPBITMAPINFO lpTarget, LPBITMAPINFO lpSource, HPALETTE hPalSrc )
{
// What we do depends on the target's color depth
switch( lpTarget->bmiHeader.biBitCount )
{
// 8bpp - need 256 entry color table
case 8:
if (hPalSrc)
{ // Palette is provided, use it
PALETTEENTRY pe[256];
UINT i;
GetPaletteEntries( hPalSrc, 0, 256, pe );
for(i=0;i<256;i++)
{
lpTarget->bmiColors[i].rgbRed = pe[i].peRed;
lpTarget->bmiColors[i].rgbGreen = pe[i].peGreen;
lpTarget->bmiColors[i].rgbBlue = pe[i].peBlue;
lpTarget->bmiColors[i].rgbReserved = 0;
}
}
else
{ // no palette povided
if( lpSource->bmiHeader.biBitCount == 8 )
{ // Source is 8bpp too, copy color table
memcpy( lpTarget->bmiColors, lpSource->bmiColors, 256*sizeof(RGBQUAD) );
}
else
{ // Source is != 8bpp, use Octree algorithm to create palette
HPALETTE hPal;
HDC hDC = GetDC( NULL );
PALETTEENTRY pe[256];
UINT i;
hPal = CreateOctreePalette((LPBYTE)lpSource, 236, 8);
if (! hPal) // use halftone palette
hPal = CreateHalftonePalette( hDC );
ReleaseDC( NULL, hDC );
GetPaletteEntries( hPal, 0, 256, pe );
DeleteObject( hPal );
for(i=0;i<256;i++)
{
lpTarget->bmiColors[i].rgbRed = pe[i].peRed;
lpTarget->bmiColors[i].rgbGreen = pe[i].peGreen;
lpTarget->bmiColors[i].rgbBlue = pe[i].peBlue;
lpTarget->bmiColors[i].rgbReserved = pe[i].peFlags;
}
}
}
break; // end 8bpp
// 4bpp - need 16 entry color table
case 4:
if (hPalSrc)
{ // Palette is provided, use it
PALETTEENTRY pe[16];
UINT i;
GetPaletteEntries( hPalSrc, 0, 16, pe );
for(i=0;i<16;i++)
{
lpTarget->bmiColors[i].rgbRed = pe[i].peRed;
lpTarget->bmiColors[i].rgbGreen = pe[i].peGreen;
lpTarget->bmiColors[i].rgbBlue = pe[i].peBlue;
lpTarget->bmiColors[i].rgbReserved = 0;
}
}
else
{ // No palette is provided
if( lpSource->bmiHeader.biBitCount == 4 )
{ // Source is 4bpp too, copy color table
memcpy( lpTarget->bmiColors, lpSource->bmiColors, 16*sizeof(RGBQUAD) );
}
else
{ // Source is != 4bpp, use system palette
HPALETTE hPal;
PALETTEENTRY pe[256];
UINT i;
hPal = (HPALETTE)GetStockObject( DEFAULT_PALETTE );
GetPaletteEntries( hPal, 0, 16, pe );
for(i=0;i<16;i++)
{
lpTarget->bmiColors[i].rgbRed = pe[i].peRed;
lpTarget->bmiColors[i].rgbGreen = pe[i].peGreen;
lpTarget->bmiColors[i].rgbBlue = pe[i].peBlue;
lpTarget->bmiColors[i].rgbReserved = pe[i].peFlags;
}
}
}
break; // end 4bpp
// 1bpp - need 2 entry mono color table
case 1:
lpTarget->bmiColors[0].rgbRed = 0;
lpTarget->bmiColors[0].rgbGreen = 0;
lpTarget->bmiColors[0].rgbBlue = 0;
lpTarget->bmiColors[0].rgbReserved = 0;
lpTarget->bmiColors[1].rgbRed = 255;
lpTarget->bmiColors[1].rgbGreen = 255;
lpTarget->bmiColors[1].rgbBlue = 255;
lpTarget->bmiColors[1].rgbReserved = 0;
break; // end 1bpp
// no color table for the > 8bpp modes
case 32:
case 24:
case 16:
default:
break;
}
return TRUE;
}
/* End CopyColorTable() *****************************************************/
/****************************************************************************
*
* FUNCTION: DIBToDIBSection
*
* PURPOSE: Create DIBSECTION from DIB
*
* PARAMS: LPBYTE lpDIB - pointer to DIB data buffer
*
* RETURNS: HBITMAP - handle of DIBSECTION, or NULL for failure
*
/****************************************************************************/
HBITMAP DIBToDIBSection(LPBYTE lpDIB)
{
LPBYTE lpSourceBits;
HDC hDC = NULL, hSourceDC;
HBITMAP hSourceBitmap, hOldSourceBitmap;
DWORD dwSourceBitsSize;
LPBITMAPINFO lpSrcDIB = (LPBITMAPINFO)lpDIB;
if (! lpSrcDIB)
return NULL;
// Gonna use DIBSections and BitBlt() to do the conversion, so make 'em
hDC = GetDC( NULL );
hSourceBitmap = CreateDIBSection( hDC, lpSrcDIB, DIB_RGB_COLORS, (VOID **)&lpSourceBits, NULL, 0 );
hSourceDC = CreateCompatibleDC( hDC );
// Flip the bits on the source DIBSection to match the source DIB
dwSourceBitsSize = lpSrcDIB->bmiHeader.biHeight * BytesPerLine((LPBYTE)&(lpSrcDIB->bmiHeader));
memcpy( lpSourceBits, FindDIBBits((LPBYTE)lpSrcDIB), dwSourceBitsSize );
// Select DIBSections into DCs
hOldSourceBitmap = (HBITMAP)SelectObject( hSourceDC, hSourceBitmap );
// Set the color tables for the DIBSections
if( lpSrcDIB->bmiHeader.biBitCount <= 8 )
SetDIBColorTable( hSourceDC, 0, 1 << lpSrcDIB->bmiHeader.biBitCount, lpSrcDIB->bmiColors );
// Clean up and delete the DCs
SelectObject( hSourceDC, hOldSourceBitmap );
DeleteDC( hSourceDC );
ReleaseDC( NULL, hDC );
// Flush the GDI batch, so we can play with the bits
GdiFlush();
return hSourceBitmap;
}
// Create DIBSECTION from DIB
HBITMAP DIBToDIBSection(HDIB hDIB)
{
HBITMAP hSourceBitmap;
// Get DIB pointer
if (! hDIB)
return NULL;
LPBYTE lpSrcDIB = (LPBYTE)GlobalLock(hDIB);
if (! lpSrcDIB)
return NULL;
hSourceBitmap = DIBToDIBSection(lpSrcDIB);
// final cleanup
GlobalUnlock(hDIB);
return hSourceBitmap;
}
/****************************************************************************
*
* FUNCTION: DIBSectionToDIB
*
* PURPOSE: Create DIB from DIBSECTION
*
* PARAMS: HBITMAP - handle of DIBSECTION, or NULL for failure
*
* RETURNS: HBITMAP hBitmap - DIB handle
*
/****************************************************************************/
HDIB DIBSectionToDIB(HBITMAP hBitmap)
{
HDC hDC = NULL, hSourceDC;
HBITMAP hOldSourceBitmap;
HANDLE hNewDIB;
LPBITMAPINFO lpbmi = NULL;
DWORD dwSize;
DIBSECTION ds;
DWORD dwColorNum;
// get DIB info
GetObject(hBitmap, sizeof(DIBSECTION), &ds);
dwColorNum = ds.dsBmih.biClrUsed;
if (dwColorNum == 0 && ds.dsBmih.biBitCount <= 8)
dwColorNum = 1 << ds.dsBmih.biBitCount;
// Allocate and fill out a BITMAPINFO struct for the new DIB
dwSize = sizeof(BITMAPINFOHEADER) + (dwColorNum * sizeof(RGBQUAD)) + ds.dsBmih.biSizeImage;
hNewDIB = GlobalAlloc(GHND, dwSize);
if (! hNewDIB)
return NULL;
lpbmi = (LPBITMAPINFO)GlobalLock(hNewDIB);
if (! lpbmi)
return NULL;
lpbmi->bmiHeader.biSize = sizeof( BITMAPINFOHEADER );
lpbmi->bmiHeader.biWidth = ds.dsBm.bmWidth;
lpbmi->bmiHeader.biHeight = ds.dsBm.bmHeight;
lpbmi->bmiHeader.biPlanes = 1;
lpbmi->bmiHeader.biBitCount = ds.dsBmih.biBitCount;
lpbmi->bmiHeader.biCompression = ds.dsBmih.biCompression;
lpbmi->bmiHeader.biSizeImage = ds.dsBmih.biSizeImage;
lpbmi->bmiHeader.biXPelsPerMeter = ds.dsBmih.biXPelsPerMeter;
lpbmi->bmiHeader.biYPelsPerMeter = ds.dsBmih.biYPelsPerMeter;
lpbmi->bmiHeader.biClrUsed = ds.dsBmih.biClrUsed;
lpbmi->bmiHeader.biClrImportant = ds.dsBmih.biClrImportant;
// get DC for operation
hDC = GetDC( NULL );
// get DIB bits
if (! GetDIBits(hDC,
hBitmap,
0L,
(DWORD)ds.dsBm.bmHeight,
(LPBYTE)lpbmi + (WORD)lpbmi->bmiHeader.biSize + (dwColorNum*sizeof(RGBQUAD)),
(LPBITMAPINFO)lpbmi,
(DWORD)DIB_RGB_COLORS))
{
GlobalUnlock(hNewDIB);
ReleaseDC(NULL,hDC);
return NULL;
}
// memory DC
hSourceDC = CreateCompatibleDC( hDC );
// Select DIBSections into DCs
hOldSourceBitmap = (HBITMAP)SelectObject( hSourceDC, hBitmap );
// Fill in the color table from DIBSection
if( lpbmi->bmiHeader.biBitCount <= 8 )
GetDIBColorTable( hSourceDC, 0, 1 << lpbmi->bmiHeader.biBitCount, lpbmi->bmiColors );
// Clean up and delete the DCs
SelectObject( hSourceDC, hOldSourceBitmap );
DeleteDC( hSourceDC );
ReleaseDC( NULL, hDC );
GlobalUnlock(hNewDIB);
return hNewDIB;
}
/*************************************************************************
*
* CopyScreenToBitmap()
*
* Parameter:
*
* LPRECT lpRect - specifies the window
*
* Return Value:
*
* HDIB - identifies the device-dependent bitmap
*
* Description:
*
* This function copies the specified part of the screen to a device-
* dependent bitmap.
*
*
************************************************************************/
HBITMAP CopyScreenToBitmap(LPRECT lpRect)
{
HDC hScrDC, hMemDC; // screen DC and memory DC
HBITMAP hBitmap, hOldBitmap; // handles to deice-dependent bitmaps
int nX, nY, nX2, nY2; // coordinates of rectangle to grab
int nWidth, nHeight; // DIB width and height
int xScrn, yScrn; // screen resolution
// check for an empty rectangle
if (IsRectEmpty(lpRect))
return NULL;
// create a DC for the screen and create
// a memory DC compatible to screen DC
hScrDC = CreateDC("DISPLAY", NULL, NULL, NULL);
hMemDC = CreateCompatibleDC(hScrDC);
// get points of rectangle to grab
nX = lpRect->left;
nY = lpRect->top;
nX2 = lpRect->right;
nY2 = lpRect->bottom;
// get screen resolution
xScrn = GetDeviceCaps(hScrDC, HORZRES);
yScrn = GetDeviceCaps(hScrDC, VERTRES);
//make sure bitmap rectangle is visible
if (nX < 0)
nX = 0;
if (nY < 0)
nY = 0;
if (nX2 > xScrn)
nX2 = xScrn;
if (nY2 > yScrn)
nY2 = yScrn;
nWidth = nX2 - nX;
nHeight = nY2 - nY;
// create a bitmap compatible with the screen DC
hBitmap = CreateCompatibleBitmap(hScrDC, nWidth, nHeight);
// select new bitmap into memory DC
hOldBitmap = (HBITMAP)SelectObject(hMemDC, hBitmap);
// bitblt screen DC to memory DC
BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, nX, nY, SRCCOPY);
// select old bitmap back into memory DC and get handle to
// bitmap of the screen
hBitmap = (HBITMAP)SelectObject(hMemDC, hOldBitmap);
// clean up
DeleteDC(hScrDC);
DeleteDC(hMemDC);
// return handle to the bitmap
return hBitmap;
}
/*************************************************************************
*
* CopyWindowToBitmap()
*
* Parameters:
*
* HWND hWnd - specifies the window
*
* WORD fPrintArea - specifies the window area to copy into the device-
* dependent bitmap
*
* Return Value:
*
* HDIB - identifies the device-dependent bitmap
*
* Description:
*
* This function copies the specified part(s) of the window to a device-
* dependent bitmap.
*
*
************************************************************************/
HBITMAP CopyWindowToBitmap(HWND hWnd, WORD fPrintArea)
{
HBITMAP hBitmap = NULL; // handle to device-dependent bitmap
// check for a valid window handle
if (!hWnd)
return NULL;
switch (fPrintArea)
{
case PW_WINDOW: // copy entire window
{
RECT rectWnd;
// get the window rectangle
GetWindowRect(hWnd, &rectWnd);
// get the bitmap of that window by calling
// CopyScreenToBitmap and passing it the window rect
hBitmap = CopyScreenToBitmap(&rectWnd);
break;
}
case PW_CLIENT: // copy client area
{
RECT rectClient;
POINT pt1, pt2;
// get client dimensions
GetClientRect(hWnd, &rectClient);
// convert client coords to screen coords
pt1.x = rectClient.left;
pt1.y = rectClient.top;
pt2.x = rectClient.right;
pt2.y = rectClient.bottom;
ClientToScreen(hWnd, &pt1);
ClientToScreen(hWnd, &pt2);
rectClient.left = pt1.x;
rectClient.top = pt1.y;
rectClient.right = pt2.x;
rectClient.bottom = pt2.y;
// get the bitmap of the client area by calling
// CopyScreenToBitmap and passing it the client rect
hBitmap = CopyScreenToBitmap(&rectClient);
break;
}
default: // invalid print area
return NULL;
}
// return handle to the bitmap
return hBitmap;
}
/*************************************************************************
*
* CopyClientRectToBitmap()
*
* Parameters:
*
* HWND hWnd - specifies the window
*
* LPRECT lpRect - specifies the client area rect to copy into the device-
* independent bitmap
*
* Return Value:
*
* HDIB - identifies the device-independent bitmap
*
* Description:
*
* This function copies the specified part(s) of the window client to a
* device-independent bitmap.
*
************************************************************************/
HBITMAP CopyClientRectToBitmap(HWND hWnd, LPRECT lpRect)
{
HBITMAP hBitmap = NULL; // handle to DIB
// check for a valid window handle
if (!hWnd)
return NULL;
POINT pt1, pt2;
// convert client coords to screen coords
pt1.x = lpRect->left;
pt1.y = lpRect->top;
pt2.x = lpRect->right;
pt2.y = lpRect->bottom;
ClientToScreen(hWnd, &pt1);
ClientToScreen(hWnd, &pt2);
lpRect->left = pt1.x;
lpRect->top = pt1.y;
lpRect->right = pt2.x;
lpRect->bottom = pt2.y;
// get the DIB of the client area by calling
// CopyScreenToDIB and passing it the client rect
hBitmap = CopyScreenToBitmap(lpRect);
// restore lpRect
pt1.x = lpRect->left;
pt1.y = lpRect->top;
pt2.x = lpRect->right;
pt2.y = lpRect->bottom;
ScreenToClient(hWnd, &pt1);
ScreenToClient(hWnd, &pt2);
lpRect->left = pt1.x;
lpRect->top = pt1.y;
lpRect->right = pt2.x;
lpRect->bottom = pt2.y;
// return the handle to the DIB
return hBitmap;
}
/*************************************************************************
*
* CopyScreenToDIB()
*
* Parameter:
*
* LPRECT lpRect - specifies the window
*
* Return Value:
*
* HDIB - identifies the device-independent bitmap
*
* Description:
*
* This function copies the specified part of the screen to a device-
* independent bitmap.
*
************************************************************************/
HDIB CopyScreenToDIB(LPRECT lpRect)
{
HBITMAP hBitmap; // handle to device-dependent bitmap
HPALETTE hPalette; // handle to palette
HDIB hDIB = NULL; // handle to DIB
// get the device-dependent bitmap in lpRect by calling
// CopyScreenToBitmap and passing it the rectangle to grab
hBitmap = CopyScreenToBitmap(lpRect);
// check for a valid bitmap handle
if (!hBitmap)
return NULL;
// get the current palette
hPalette = GetSystemPalette();
// convert the bitmap to a DIB
hDIB = BitmapToDIB(hBitmap, hPalette);
// clean up
DeleteObject(hPalette);
DeleteObject(hBitmap);
// return handle to the packed-DIB
return hDIB;
}
/*************************************************************************
*
* CopyWindowToDIB()
*
* Parameters:
*
* HWND hWnd - specifies the window
*
* WORD fPrintArea - specifies the window area to copy into the device-
* independent bitmap
*
* Return Value:
*
* HDIB - identifies the device-independent bitmap
*
* Description:
*
* This function copies the specified part(s) of the window to a device-
* independent bitmap.
*
************************************************************************/
HDIB CopyWindowToDIB(HWND hWnd, WORD fPrintArea)
{
HDIB hDIB = NULL; // handle to DIB
// check for a valid window handle
if (!hWnd)
return NULL;
switch (fPrintArea)
{
case PW_WINDOW: // copy entire window
{
RECT rectWnd;
// get the window rectangle
GetWindowRect(hWnd, &rectWnd);
// get the DIB of the window by calling
// CopyScreenToDIB and passing it the window rect
hDIB = CopyScreenToDIB(&rectWnd);
break;
}
case PW_CLIENT: // copy client area
{
RECT rectClient;
POINT pt1, pt2;
// get the client area dimensions
GetClientRect(hWnd, &rectClient);
// convert client coords to screen coords
pt1.x = rectClient.left;
pt1.y = rectClient.top;
pt2.x = rectClient.right;
pt2.y = rectClient.bottom;
ClientToScreen(hWnd, &pt1);
ClientToScreen(hWnd, &pt2);
rectClient.left = pt1.x;
rectClient.top = pt1.y;
rectClient.right = pt2.x;
rectClient.bottom = pt2.y;
// get the DIB of the client area by calling
// CopyScreenToDIB and passing it the client rect
hDIB = CopyScreenToDIB(&rectClient);
break;
}
default: // invalid print area
return NULL;
}
// return the handle to the DIB
return hDIB;
}
/*************************************************************************
*
* CopyClientRectToDIB()
*
* Parameters:
*
* HWND hWnd - specifies the window
*
* LPRECT lpRect - specifies the client area rect to copy into the device-
* independent bitmap
*
* Return Value:
*
* HDIB - identifies the device-independent bitmap
*
* Description:
*
* This function copies the specified part(s) of the window client to a
* device-independent bitmap.
*
************************************************************************/
HDIB CopyClientRectToDIB(HWND hWnd, LPRECT lpRect)
{
HDIB hDIB = NULL; // handle to DIB
// check for a valid window handle
if (!hWnd)
return NULL;
POINT pt1, pt2;
// convert client coords to screen coords
pt1.x = lpRect->left;
pt1.y = lpRect->top;
pt2.x = lpRect->right;
pt2.y = lpRect->bottom;
ClientToScreen(hWnd, &pt1);
ClientToScreen(hWnd, &pt2);
lpRect->left = pt1.x;
lpRect->top = pt1.y;
lpRect->right = pt2.x;
lpRect->bottom = pt2.y;
// get the DIB of the client area by calling
// CopyScreenToDIB and passing it the client rect
hDIB = CopyScreenToDIB(lpRect);
// restore lpRect
pt1.x = lpRect->left;
pt1.y = lpRect->top;
pt2.x = lpRect->right;
pt2.y = lpRect->bottom;
ScreenToClient(hWnd, &pt1);
ScreenToClient(hWnd, &pt2);
lpRect->left = pt1.x;
lpRect->top = pt1.y;
lpRect->right = pt2.x;
lpRect->bottom = pt2.y;
// return the handle to the DIB
return hDIB;
}
/*************************************************************************
*
* PaintDIB()
*
* Parameters:
*
* HDC hDC - DC to do output to
*
* LPRECT lpDCRect - rectangle on DC to do output to
*
* HDIB hDIB - handle to global memory with a DIB spec
* in it followed by the DIB bits
*
* LPRECT lpDIBRect - rectangle of DIB to output into lpDCRect
*
* HPALETTE hPal - Palette used to diaplsy DIB, if is NULL,
* use DIB palette to display
*
* DWORD dwRop - ROP mode to display DIB
*
* Return Value:
*
* BOOL - TRUE if DIB was drawn, FALSE otherwise
*
* Description:
* Painting routine for a DIB. Calls StretchDIBits() or
* SetDIBitsToDevice() to paint the DIB. The DIB is
* output to the specified DC, at the coordinates given
* in lpDCRect. The area of the DIB to be output is
* given by lpDIBRect.
*
* NOTE: This function always selects the palette as background. Before
* calling this function, be sure your palette is selected to desired
* priority (foreground or background).
*
*
************************************************************************/
BOOL PaintDIB(HDC hDC, LPRECT lpDCRect, HDIB hDIB, LPRECT lpDIBRect,
HPALETTE hPal, DWORD dwRop)
{
LPBYTE lpDIBHdr; // Pointer to BITMAPINFOHEADER
LPBYTE lpDIBBits; // Pointer to DIB bits
BOOL bSuccess=FALSE; // Success/fail flag
HPALETTE hOldPal=NULL; // Previous palette
// Check for valid DIB handle
if (!hDIB)
return FALSE;
// Lock down the DIB, and get a pointer to the beginning of the bit
// buffer
lpDIBHdr = (LPBYTE)GlobalLock(hDIB);
lpDIBBits = FindDIBBits(lpDIBHdr);
// if no palette provided, create one from DIB
if (! hPal)
hPal = CreateDIBPalette(lpDIBHdr);
// Select and realize our palette as background
if (hPal)
{
hOldPal = SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
}
// Make sure to use the stretching mode best for color pictures
SetStretchBltMode(hDC, COLORONCOLOR);
// Call StretchDIBits() with dwRop
bSuccess = StretchDIBits(hDC,
lpDCRect->left,
lpDCRect->top,
RECTWIDTH(lpDCRect),
RECTHEIGHT(lpDCRect),
lpDIBRect->left,
(int)DIBHeight(lpDIBHdr) - lpDIBRect->top - RECTHEIGHT(lpDIBRect),
RECTWIDTH(lpDIBRect),
RECTHEIGHT(lpDIBRect),
lpDIBBits,
(LPBITMAPINFO)lpDIBHdr,
DIB_RGB_COLORS,
SRCCOPY);
// Unlock the memory block
GlobalUnlock(hDIB);
// Reselect old palette
if (hOldPal)
SelectPalette(hDC, hOldPal, FALSE);
// Return with success/fail flag
return bSuccess;
}
/*************************************************************************
*
* PaintBitmap()
*
* Parameters:
*
* HDC hDC - DC to do output to
*
* LPRECT lpDCRect - rectangle on DC to do output to
*
* HBITMAP hDDB - handle to device-dependent bitmap (DDB)
*
* LPRECT lpDDBRect - rectangle of DDB to output into lpDCRect
*
* HPALETTE hPalette - handle to the palette to use with hDDB
*
* Return Value:
*
* BOOL - TRUE if bitmap was drawn, FLASE otherwise
*
* Description:
*
* Painting routine for a DDB. Calls BitBlt() or
* StretchBlt() to paint the DDB. The DDB is
* output to the specified DC, at the coordinates given
* in lpDCRect. The area of the DDB to be output is
* given by lpDDBRect. The specified palette is used.
*
* NOTE: This function always selects the palette as background. Before
* calling this function, be sure your palette is selected to desired
* priority (foreground or background).
*
************************************************************************/
BOOL PaintBitmap(HDC hDC, LPRECT lpDCRect, HBITMAP hDDB, LPRECT lpDDBRect,
HPALETTE hPal, DWORD dwRop)
{
HDC hMemDC; // Handle to memory DC
HBITMAP hOldBitmap; // Handle to previous bitmap
HPALETTE hOldPal1 = NULL; // Handle to previous palette
HPALETTE hOldPal2 = NULL; // Handle to previous palette
BOOL bSuccess = FALSE; // Success/fail flag
// Create a memory DC
hMemDC = CreateCompatibleDC (hDC);
// If this failed, return FALSE
if (!hMemDC)
return FALSE;
// If we have a palette, select and realize it
if (hPal)
{
hOldPal1 = SelectPalette(hMemDC, hPal, TRUE);
hOldPal2 = SelectPalette(hDC, hPal, TRUE);
RealizePalette(hDC);
}
// Select bitmap into the memory DC
hOldBitmap = (HBITMAP)SelectObject (hMemDC, hDDB);
// Make sure to use the stretching mode best for color pictures
SetStretchBltMode (hDC, COLORONCOLOR);
// Determine whether to call StretchBlt() or BitBlt()
if ((RECTWIDTH(lpDCRect) == RECTWIDTH(lpDDBRect)) &&
(RECTHEIGHT(lpDCRect) == RECTHEIGHT(lpDDBRect)))
bSuccess = BitBlt(hDC, lpDCRect->left, lpDCRect->top,
lpDCRect->right - lpDCRect->left,
lpDCRect->bottom - lpDCRect->top, hMemDC, lpDDBRect->left,
lpDDBRect->top, dwRop);
else
bSuccess = StretchBlt(hDC, lpDCRect->left, lpDCRect->top,
lpDCRect->right - lpDCRect->left,
lpDCRect->bottom - lpDCRect->top, hMemDC, lpDDBRect->left,
lpDDBRect->top, lpDDBRect->right - lpDDBRect->left,
lpDDBRect->bottom - lpDDBRect->top, dwRop);
// Clean up
SelectObject(hMemDC, hOldBitmap);
if (hOldPal1)
SelectPalette (hMemDC, hOldPal1, FALSE);
if (hOldPal2)
SelectPalette (hDC, hOldPal2, FALSE);
DeleteDC (hMemDC);
// Return with success/fail flag
return bSuccess;
}
/*************************************************************************
*
* DisplayPalette ()
*
* Parameter:
*
* HDC hDC - handle of device context to display palette
* LPRECT lpRect - rect range to show palette
* HPALETTE hPal - handle of palette to display
*
* Return Value:
*
* BOOL - TRUE, if success, else FALSE
*
* Description:
*
* This function displays palette on the specified rectangle in a device context
*
************************************************************************/
BOOL DisplayPalette(HDC hDC, LPRECT lpRect, HPALETTE hPal)
{
if (! hPal)
return FALSE;
int nEntries;
PALETTEENTRY pe[256];
nEntries = GetPaletteEntries(hPal, 0, 256, pe);
int nSqr = (int)sqrt((double)nEntries);
int nWidth = (lpRect->right-lpRect->left)/nSqr;
int nHeight = (lpRect->bottom-lpRect->top)/nSqr;
lpRect->right = lpRect->left + nWidth*nSqr;
lpRect->bottom = lpRect->top + nHeight*nSqr;
HPALETTE hOldPal = (HPALETTE)SelectPalette(hDC, hPal, FALSE);
RealizePalette(hDC);
HBRUSH hBrush, hOldBrush;
int x, y;
for (int i=0; i<nEntries; ++i)
{
x = i%nSqr;
y = i/nSqr;
hBrush = CreateSolidBrush(RGB(pe[i].peRed, pe[i].peGreen, pe[i].peBlue));
hOldBrush = (HBRUSH)SelectObject(hDC, hBrush);
Rectangle(hDC,
lpRect->left + x*nWidth,
lpRect->top + y*nHeight,
lpRect->left + (x+1)*nWidth,
lpRect->top + (y+1) *nHeight);
SelectObject(hDC, hOldBrush);
DeleteObject(hBrush);
}
SelectPalette(hDC, hOldPal, FALSE);
return TRUE;
}
/*************************************************************************
*
* CopyPalette ()
*
* Parameter:
*
* HPALETTE hPalSrc - source palette handle
*
* Return Value:
*
* HPALETTE - destination palette handle
*
* Description:
*
* This function copys the source palette to a new palette handle
*
************************************************************************/
HPALETTE CopyPalette(HPALETTE hPalSrc)
{
PLOGPALETTE plogPal;
int iNumEntries=0;
HPALETTE hPal;
HANDLE h;
iNumEntries = GetPaletteEntries(hPalSrc, 0, iNumEntries, NULL);
if (iNumEntries == 0)
return (HPALETTE) NULL;
h = GlobalAlloc(GHND, sizeof(DWORD) + sizeof(PALETTEENTRY)*iNumEntries);
if (! h)
return (HPALETTE) NULL;
plogPal = (PLOGPALETTE)GlobalLock(h);
if (! plogPal)
return (HPALETTE) NULL;
plogPal->palVersion = 0x300;
plogPal->palNumEntries = (WORD) iNumEntries;
GetPaletteEntries(hPalSrc, 0, iNumEntries, plogPal->palPalEntry);
hPal = CreatePalette(plogPal);
GlobalUnlock(h);
GlobalFree(h);
return hPal;
}
/*************************************************************************
*
* PalEntriesOnDevice()
*
* Parameter:
*
* HDC hDC - device context
*
* Return Value:
*
* int - number of palette entries on device
*
* Description:
*
* This function gets the number of palette entries on the specified device
*
************************************************************************/
int PalEntriesOnDevice(HDC hDC)
{
int nColors; // number of colors
// Find out the number of colors on this device.
nColors = (1 << (GetDeviceCaps(hDC, BITSPIXEL) * GetDeviceCaps(hDC, PLANES)));
assert(nColors);
return nColors;
}
/*************************************************************************
*
* GetSystemPalette()
*
* Parameters:
*
* None
*
* Return Value:
*
* HPALETTE - handle to a copy of the current system palette
*
* Description:
*
* This function returns a handle to a palette which represents the system
* palette. The system RGB values are copied into our logical palette using
* the GetSystemPaletteEntries function.
*
************************************************************************/
HPALETTE GetSystemPalette(void)
{
HDC hDC; // handle to a DC
static HPALETTE hPal = NULL; // handle to a palette
HANDLE hLogPal; // handle to a logical palette
LPLOGPALETTE lpLogPal; // pointer to a logical palette
int nColors; // number of colors
// Find out how many palette entries we want.
hDC = GetDC(NULL);
if (!hDC)
return NULL;
nColors = PalEntriesOnDevice(hDC); // Number of palette entries
// Allocate room for the palette and lock it.
hLogPal = GlobalAlloc(GHND, sizeof(LOGPALETTE) + nColors *
sizeof(PALETTEENTRY));
// if we didn't get a logical palette, return NULL
if (!hLogPal)
return NULL;
// get a pointer to the logical palette
lpLogPal = (LPLOGPALETTE)GlobalLock(hLogPal);
// set some important fields
lpLogPal->palVersion = PALVERSION;
lpLogPal->palNumEntries = nColors;
// Copy the current system palette into our logical palette
GetSystemPaletteEntries(hDC, 0, nColors,
(LPPALETTEENTRY)(lpLogPal->palPalEntry));
// Go ahead and create the palette. Once it's created,
// we no longer need the LOGPALETTE, so free it.
hPal = CreatePalette(lpLogPal);
// clean up
GlobalUnlock(hLogPal);
GlobalFree(hLogPal);
ReleaseDC(NULL, hDC);
return hPal;
}
/*************************************************************************
*
* CreateIdentifyPalette ()
*
* Parameter:
*
* HPALETTE hPalSrc - source palette handle
*
* Return Value:
*
* HPALETTE - destination identify palette handle
*
* Description:
*
* This function creates an identify palette from the source palette handle
*
************************************************************************/
HPALETTE CreateIdentifyPalette(HPALETTE hPalSrc)
{
BOOL bResult = FALSE;
int i, iSysColors, iPalEntries;
HPALETTE hPalette, hpalOld;
if (! hPalSrc)
return NULL;
// create a new palette equal to input
hPalette = CopyPalette(hPalSrc);
// Get a screen DC to work with
HDC hdcScreen = GetDC(NULL);
ASSERT(hdcScreen);
// Make sure we are on a palettized device
if (!(GetDeviceCaps(hdcScreen, RASTERCAPS) & RC_PALETTE))
{
TRACE("Not a palettized device");
goto abort;
}
// Get the number of system colors and the number of palette entries
// Note that on a palletized device the number of colors is the
// number of guaranteed colors. I.e. the number of reserved system colors
iSysColors = GetDeviceCaps(hdcScreen, NUMCOLORS);
iPalEntries = GetDeviceCaps(hdcScreen, SIZEPALETTE);
// if there are more than 256 colors we are wasting our time
if (iSysColors > 256) goto abort;
// Now we force the palette manager to reset its tables so that
// the next palette to be realized will get its colors in the order they are
// in the logical palette. This is done by changing the number of
// reserved colors.
SetSystemPaletteUse(hdcScreen, SYSPAL_NOSTATIC);
SetSystemPaletteUse(hdcScreen, SYSPAL_STATIC);
// Select our palette into the screen DC and realize it so that
// its colors will be entered into the free slots in the physical palette
hpalOld = ::SelectPalette(hdcScreen,
hPalette, // our hpal
FALSE);
::RealizePalette(hdcScreen);
// Now replace the old palette (but don't realize it)
::SelectPalette(hdcScreen, hpalOld, FALSE);
// The physical palette now has our colors set in place and its own
// reserved colors at either end. We can grab the lot now
PALETTEENTRY pe[256];
GetSystemPaletteEntries(hdcScreen,
0,
iPalEntries,
pe);
// Set the PC_NOCOLLAPSE flag for each of our colors so that GDI
// won't merge them together. Be careful not to set PC_NOCOLLAPSE for the
// sys color entries or we'll get multpile copies of these colors in
// the palette when we realize it.
for (i = 0; i < iSysColors/2; i++) {
pe[i].peFlags = 0;
}
for (; i < iPalEntries-iSysColors/2; i++) {
pe[i].peFlags = PC_NOCOLLAPSE;
}
for (; i < iPalEntries; i++) {
pe[i].peFlags = 0;
}
// Resize the palette in case it was smaller
ResizePalette(hPalette, iPalEntries);
// Update the palette entries with what is now in the physical palette
SetPaletteEntries(hPalette, 0, iPalEntries, pe);
bResult = TRUE;
abort:
::ReleaseDC(NULL, hdcScreen);
return bResult ? hPalette : NULL;
}
/*************************************************************************
*
* MapDIBColorsToPalette ()
*
* Parameter:
*
* HDIB hDIB - DIB handle
* HPALETTE hPalette - given palette handle
*
* Return Value:
*
* HPALETTE - destination identify palette handle
*
* Description:
*
* This function Map the colors in a DIB to a given palette.
*
************************************************************************/
BOOL MapDIBColorsToPalette(HDIB hDIB, HPALETTE hPalette)
{
if (! hDIB)
return FALSE;
if (! hPalette)
return FALSE;
LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
if (! lpbi)
return FALSE;
LPRGBQUAD pctThis = (LPRGBQUAD)((LPBYTE)lpbi + lpbi->biSize);
// build an index translation table to map this DIBs colors
// to those of the reference DIB
BYTE imap[256];
for (int i = 0; i < 256; i++)
{
imap[i] = (BYTE)GetNearestPaletteIndex(hPalette,
RGB(pctThis->rgbRed,
pctThis->rgbGreen,
pctThis->rgbBlue));
pctThis++;
}
// now map the DIB bits
LPBYTE pBits = (LPBYTE)lpbi + lpbi->biSize + PaletteSize((LPBYTE)lpbi);
int iSize = WIDTHBYTES(lpbi->biBitCount*lpbi->biWidth) * lpbi->biHeight;
while (iSize--)
{
*pBits = imap[*pBits];
pBits++;
}
// Now reset the DIB color table so that its RGB values match
// those in the palette
PALETTEENTRY pe[256];
GetPaletteEntries(hPalette, 0, 256, pe);
pctThis = (LPRGBQUAD)((LPBYTE)lpbi + lpbi->biSize);
for (i = 0; i < 256; i++)
{
pctThis->rgbRed = pe[i].peRed;
pctThis->rgbGreen = pe[i].peGreen;
pctThis->rgbBlue = pe[i].peBlue;
pctThis++;
}
GlobalUnlock(hDIB);
return TRUE;
}
/*************************************************************************
*
* CopyHandle()
*
* Parameters:
*
* HANDLE h - source handle
*
* Return Value:
*
* HANDLE - duplicated handle
*
* Description:
*
* Copy memory handle to another
************************************************************************/
HANDLE CopyHandle(HANDLE h)
{
if (h == NULL)
return NULL;
DWORD dwLen = ::GlobalSize((HGLOBAL)h);
HANDLE hCopy = ::GlobalAlloc(GHND, dwLen);
if (hCopy == NULL)
return NULL;
void* lpCopy = ::GlobalLock((HGLOBAL) hCopy);
void* lp = ::GlobalLock((HGLOBAL) h);
::CopyMemory(lpCopy, lp, dwLen);
::GlobalUnlock(hCopy);
::GlobalUnlock(h);
return hCopy;
}
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