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povray/windows/pvbitmap.cpp
chris20 86f4639d37 Initial import
2013-11-06 13:07:19 -05:00

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/*******************************************************************************
* pvbitmap.cpp
*
* Provides an API for bitmap manipulation.
*
* This file is derived from Microsoft sample source and is used by permission.
*
* ---------------------------------------------------------------------------
* Persistence of Vision Ray Tracer ('POV-Ray') version 3.7.
* Copyright 1991-2013 Persistence of Vision Raytracer Pty. Ltd.
*
* POV-Ray is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* POV-Ray 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* ---------------------------------------------------------------------------
* POV-Ray is based on the popular DKB raytracer version 2.12.
* DKBTrace was originally written by David K. Buck.
* DKBTrace Ver 2.0-2.12 were written by David K. Buck & Aaron A. Collins.
* ---------------------------------------------------------------------------
* $File: //depot/public/povray/3.x/windows/pvbitmap.cpp $
* $Revision: #1 $
* $Change: 6069 $
* $DateTime: 2013/11/06 11:59:40 $
* $Author: chrisc $
*******************************************************************************/
#define POVWIN_FILE
#define _WIN32_IE COMMONCTRL_VERSION
#include <windows.h>
#include <string.h>
#include "pvengine.h"
#include "pvbitmap.h"
#include "pvdisplay.h"
// this must be the last file included
#include "syspovdebug.h"
#define DIB_HEADER_MARKER ((WORD) ('M' << 8) | 'B')
/*********************************************************************
*
* Local Function Prototypes
*
*********************************************************************/
namespace povwin
{
HANDLE ReadDIBFile(int);
bool MyRead(int, LPSTR, DWORD);
bool SaveDIBFile(void);
bool WriteDIB(LPSTR, HANDLE);
DWORD PASCAL MyWrite(int, VOID *, DWORD);
extern int render_bitmap_depth ;
extern HPALETTE hPalBitmap ;
/*************************************************************************
*
* 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.
*
*
* History: Date Author Reason
* 3/20/92 Mark Bader Created
*
************************************************************************/
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((LPSTR)&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;
}
/*************************************************************************
*
* FindDIBBits()
*
* Parameter:
*
* LPSTR lpDIB - pointer to packed-DIB memory block
*
* Return Value:
*
* LPSTR - pointer to the DIB bits
*
* Description:
*
* This function calculates the address of the DIB's bits and returns a
* pointer to the DIB bits.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
LPSTR FindDIBBits(LPSTR lpDIB)
{
return (lpDIB + *(LPDWORD)lpDIB + PaletteSize(lpDIB));
}
/*************************************************************************
*
* DIBWidth()
*
* Parameter:
*
* LPSTR 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.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
DWORD DIBWidth(LPSTR 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;
}
/*************************************************************************
*
* DIBHeight()
*
* Parameter:
*
* LPSTR 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.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
DWORD DIBHeight(LPSTR 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;
}
/*************************************************************************
*
* PaletteSize()
*
* Parameter:
*
* LPSTR 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).
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
WORD PaletteSize(LPSTR lpDIB)
{
/* calculate the size required by the palette */
if (IS_WIN30_DIB (lpDIB))
return (DIBNumColors(lpDIB) * sizeof(RGBQUAD));
else
return (DIBNumColors(lpDIB) * sizeof(RGBTRIPLE));
}
/*************************************************************************
*
* DIBNumColors()
*
* Parameter:
*
* LPSTR 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.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
WORD DIBNumColors(LPSTR 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;
}
}
/*************************************************************************
*
* 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).
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
HPALETTE CreateDIBPalette(HDIB hDIB)
{
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
LPSTR lpbi; // pointer to packed-DIB
LPBITMAPINFO lpbmi; // pointer to BITMAPINFO structure (Win3.0)
LPBITMAPCOREINFO lpbmc; // pointer to BITMAPCOREINFO structure (OS/2)
bool bWinStyleDIB; // flag which signifies whether this is a Win3.0 DIB
/* if handle to DIB is invalid, return NULL */
if (!hDIB)
return NULL;
/* lock DIB memory block and get a pointer to it */
lpbi = (LPSTR)GlobalLock(hDIB);
/* 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)
{
GlobalUnlock(hDIB);
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;
}
}
/* clean up */
GlobalUnlock(hLogPal);
GlobalFree(hLogPal);
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.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
* 3/27/92 Mark Bader Added comments about resulting
* bitmap format
*
************************************************************************/
HBITMAP DIBToBitmap(HDIB hDIB, HPALETTE hPal)
{
LPSTR 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 = (LPSTR)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;
}
HBITMAP lpDIBToBitmap(void *lpDIBHdr, HPALETTE hPal)
{
LPSTR 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 (!lpDIBHdr)
return NULL;
/* get a pointer to the DIB bits */
lpDIBBits = FindDIBBits((LPSTR)lpDIBHdr) ;
/* get a DC */
hDC = GetDC(NULL);
if (!hDC)
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);
/* return handle to the bitmap */
return hBitmap;
}
HBITMAP lpDIBToBitmapAndPalette(void *lpDIBHdr)
{
LPSTR lpDIBBits; // pointer to DIB header, pointer to DIB bits
HBITMAP hBitmap; // handle to device-dependent bitmap
HDC hDC; // handle to DC
HPALETTE hOldPal; // handle to a palette
if (!lpDIBHdr)
return NULL;
/* get a pointer to the DIB bits */
lpDIBBits = FindDIBBits((LPSTR)lpDIBHdr) ;
/* get a DC */
hDC = GetDC(NULL);
if (!hDC)
return NULL;
hPalBitmap = pov_frontend::WinLegacyDisplay::CreatePalette (((BITMAPINFO *) lpDIBHdr)->bmiColors, ((BITMAPINFO *) lpDIBHdr)->bmiHeader.biClrImportant, render_bitmap_depth != 24) ;
if (hPalBitmap)
{
hOldPal = SelectPalette(hDC, hPalBitmap, FALSE);
SelectPalette(hDC, hPalBitmap, 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 (hPalBitmap)
if (hOldPal)
SelectPalette(hDC, hOldPal, FALSE);
/* clean up */
ReleaseDC(NULL, hDC);
/* 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.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
* 12/10/91 Patrick Schreiber Added bits per pixel validation
* and check GetObject return value
*
************************************************************************/
HDIB BitmapToDIB(HBITMAP hBitmap, HPALETTE hPal)
{
BITMAP bm; // bitmap structure
BITMAPINFOHEADER bi; // bitmap header
BITMAPINFOHEADER *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), (LPSTR)&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((LPSTR)&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, (WORD)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((LPSTR)&bi) + bi.biSizeImage;
if ((h = GlobalReAlloc(hDIB, dwLen, 0)) != NULL)
hDIB = h;
else
{
/* clean up and return NULL */
GlobalFree(hDIB);
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, (WORD)bi.biHeight, (LPSTR)lpbi + (WORD)lpbi
->biSize + PaletteSize((LPSTR)lpbi), (LPBITMAPINFO)lpbi,
DIB_RGB_COLORS) == 0)
{
/* clean up and return NULL */
GlobalUnlock(hDIB);
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;
}
/*************************************************************************
*
* 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
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
*
************************************************************************/
int PalEntriesOnDevice(HDC hDC)
{
int nColors; // number of colors
/* Find out the number of palette entries on this
* device.
*/
nColors = GetDeviceCaps(hDC, SIZEPALETTE);
/* For non-palette devices, we'll use the # of system
* colors for our palette size.
*/
if (!nColors)
nColors = GetDeviceCaps(hDC, NUMCOLORS);
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.
*
* History:
*
* Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 9/15/91 Patrick Schreiber Added header and comments
* 12/20/91 Mark Bader Added GetSystemPaletteEntries call
*
************************************************************************/
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;
}
/*************************************************************************
*
* AllocRoomForDIB()
*
* Parameters:
*
* BITMAPINFOHEADER - bitmap info header stucture
*
* HBITMAP - handle to the bitmap
*
* Return Value:
*
* HDIB - handle to memory block
*
* Description:
*
* This routine takes a BITMAPINOHEADER, and returns a handle to global
* memory which can contain a DIB with that header. It also initializes
* the header portion of the global memory. GetDIBits() is used to determine
* the amount of room for the DIB's bits. The total amount of memory
* needed = sizeof(BITMAPINFOHEADER) + size of color table + size of bits.
*
* History: Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 12/11/91 Patrick Schreiber Added header and some comments
*
************************************************************************/
HANDLE AllocRoomForDIB(BITMAPINFOHEADER bi, HBITMAP hBitmap)
{
DWORD dwLen;
HANDLE hDIB;
HDC hDC;
LPBITMAPINFOHEADER lpbi;
HANDLE hTemp;
/* Figure out the size needed to hold the BITMAPINFO structure
* (which includes the BITMAPINFOHEADER and the color table).
*/
dwLen = bi.biSize + PaletteSize((LPSTR) &bi);
hDIB = GlobalAlloc(GHND,dwLen);
/* Check that DIB handle is valid */
if (!hDIB)
return NULL;
/* Set up the BITMAPINFOHEADER in the newly allocated global memory,
* then call GetDIBits() with lpBits = NULL to have it fill in the
* biSizeImage field for us.
*/
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
*lpbi = bi;
hDC = GetDC(NULL);
GetDIBits(hDC, hBitmap, 0, (WORD) bi.biHeight,
NULL, (LPBITMAPINFO) lpbi, DIB_RGB_COLORS);
ReleaseDC(NULL, hDC);
/* If the driver did not fill in the biSizeImage field,
* fill it in -- NOTE: this is a bug in the driver!
*/
if (lpbi->biSizeImage == 0)
lpbi->biSizeImage = WIDTHBYTES((DWORD)lpbi->biWidth * lpbi->biBitCount) *
lpbi->biHeight;
/* Get the size of the memory block we need */
dwLen = lpbi->biSize + PaletteSize((LPSTR) &bi) + lpbi->biSizeImage;
/* Unlock the memory block */
GlobalUnlock(hDIB);
/* ReAlloc the buffer big enough to hold all the bits */
if ((hTemp = GlobalReAlloc(hDIB,dwLen,0)) != NULL)
return hTemp;
else
{
/* Else free memory block and return failure */
GlobalFree(hDIB);
return NULL;
}
}
/*************************************************************************
*
* 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.
*
* History:
*
* Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 12/10/91 Patrick Schreiber Modified from converting RGB to RLE8
* to converting RGB/RLE to RGB/RLE.
* Added wBitCount and dwCompression
* parameters. Also added header and
* comments.
*
************************************************************************/
HDIB ChangeDIBFormat(HDIB hDIB, WORD wBitCount, DWORD dwCompression)
{
HDC hDC; // Handle to DC
HBITMAP hBitmap; // Handle to bitmap
BITMAP Bitmap; // BITMAP data structure
BITMAPINFOHEADER bi; // Bitmap info header
LPBITMAPINFOHEADER lpbi; // Pointer to bitmap info
HDIB hNewDIB; // Handle to new DIB
HPALETTE hPal, hOldPal; // Handle to palette, prev pal
WORD DIBBPP, NewBPP; // DIB bits per pixel, new bpp
DWORD NewComp; // New compression
/* Check for a valid DIB handle */
if (!hDIB)
return NULL;
/* Get the old DIB's bits per pixel and compression format */
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
DIBBPP = ((LPBITMAPINFOHEADER)lpbi)->biBitCount;
GlobalUnlock(hDIB);
/* Validate wBitCount and dwCompression
* They must match correctly (i.e., BI_RLE4 and 4 BPP or
* BI_RLE8 and 8BPP, etc.) or we return failure */
if (wBitCount == 0)
{
NewBPP = DIBBPP;
if ((dwCompression == BI_RLE4 && NewBPP == 4) ||
(dwCompression == BI_RLE8 && NewBPP == 8) ||
(dwCompression == BI_RGB))
NewComp = dwCompression;
else
return NULL;
}
else if (wBitCount == 1 && dwCompression == BI_RGB)
{
NewBPP = wBitCount;
NewComp = BI_RGB;
}
else if (wBitCount == 4)
{
NewBPP = wBitCount;
if (dwCompression == BI_RGB || dwCompression == BI_RLE4)
NewComp = dwCompression;
else
return NULL;
}
else if (wBitCount == 8)
{
NewBPP = wBitCount;
if (dwCompression == BI_RGB || dwCompression == BI_RLE8)
NewComp = dwCompression;
else
return NULL;
}
else if (wBitCount == 24 && dwCompression == BI_RGB)
{
NewBPP = wBitCount;
NewComp = BI_RGB;
}
else
return NULL;
/* Save the old DIB's palette */
hPal = CreateDIBPalette(hDIB);
if (!hPal)
return NULL;
/* Convert old DIB to a bitmap */
hBitmap = DIBToBitmap(hDIB, hPal);
if (!hBitmap)
{
DeleteObject(hPal);
return NULL;
}
/* Get info about the bitmap */
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
/* Fill in the BITMAPINFOHEADER appropriately */
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = NewBPP;
bi.biCompression = NewComp;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
/* Go allocate room for the new DIB */
hNewDIB = AllocRoomForDIB(bi, hBitmap);
if (!hNewDIB)
return NULL;
/* Get a pointer to the new DIB */
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hNewDIB);
/* Get a DC and select/realize our palette in it */
hDC = GetDC(NULL);
hOldPal = SelectPalette(hDC, hPal, FALSE);
RealizePalette(hDC);
/* Call GetDIBits and get the new DIB bits */
if (!GetDIBits(hDC, hBitmap, 0, (WORD) lpbi->biHeight,
(LPSTR)lpbi + (WORD)lpbi->biSize + PaletteSize((LPSTR)lpbi),
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS))
{
GlobalUnlock(hNewDIB);
GlobalFree(hNewDIB);
hNewDIB = NULL;
}
/* Clean up and return */
SelectPalette(hDC, hOldPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
if (hNewDIB)
/* Unlock the new DIB's memory block */
GlobalUnlock(hNewDIB);
DeleteObject(hBitmap);
DeleteObject(hPal);
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.
*
* History:
*
* Date Author Reason
* 6/01/91 Garrett McAuliffe Created
* 12/10/91 Patrick Schreiber Modified from converting RGB to RLE8
* to converting RGB/RLE to RGB/RLE.
* Added wBitCount and dwCompression
* parameters. Also added header and
* comments.
* 12/11/91 Patrick Schreiber Destroy old DIB if conversion was
* successful.
* 12/16/91 Patrick Schreiber Modified from converting DIB to new
* DIB to bitmap to new DIB. Added palette
* parameter.
*
************************************************************************/
HDIB ChangeBitmapFormat(HBITMAP hBitmap,
WORD wBitCount,
DWORD dwCompression,
HPALETTE hPal)
{
HDC hDC; // Screen DC
HDIB hNewDIB; // Handle to new DIB
BITMAP Bitmap; // BITMAP data structure
BITMAPINFOHEADER bi; // Bitmap info. header
LPBITMAPINFOHEADER lpbi; // Pointer to bitmap header
HPALETTE hOldPal=NULL; // Handle to palette
WORD NewBPP; // New bits per pixel
DWORD NewComp; // New compression format
/* Check for a valid bitmap handle */
if (!hBitmap)
return NULL;
/* Validate wBitCount and dwCompression
* They must match correctly (i.e., BI_RLE4 and 4 BPP or
* BI_RLE8 and 8BPP, etc.) or we return failure
*/
if (wBitCount == 0)
{
NewComp = dwCompression;
if (NewComp == BI_RLE4)
NewBPP = 4;
else if (NewComp == BI_RLE8)
NewBPP = 8;
else /* Not enough info */
return NULL;
}
else if (wBitCount == 1 && dwCompression == BI_RGB)
{
NewBPP = wBitCount;
NewComp = BI_RGB;
}
else if (wBitCount == 4)
{
NewBPP = wBitCount;
if (dwCompression == BI_RGB || dwCompression == BI_RLE4)
NewComp = dwCompression;
else
return NULL;
}
else if (wBitCount == 8)
{
NewBPP = wBitCount;
if (dwCompression == BI_RGB || dwCompression == BI_RLE8)
NewComp = dwCompression;
else
return NULL;
}
else if (wBitCount == 24 && dwCompression == BI_RGB)
{
NewBPP = wBitCount;
NewComp = BI_RGB;
}
else
return NULL;
/* Get info about the bitmap */
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&Bitmap);
/* Fill in the BITMAPINFOHEADER appropriately */
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = Bitmap.bmWidth;
bi.biHeight = Bitmap.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = NewBPP;
bi.biCompression = NewComp;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
/* Go allocate room for the new DIB */
hNewDIB = AllocRoomForDIB(bi, hBitmap);
if (!hNewDIB)
return NULL;
/* Get a pointer to the new DIB */
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hNewDIB);
/* If we have a palette, get a DC and select/realize it */
if (hPal)
{
hDC = GetDC(NULL);
hOldPal = SelectPalette(hDC, hPal, FALSE);
RealizePalette(hDC);
}
/* Call GetDIBits and get the new DIB bits */
if (!GetDIBits(hDC, hBitmap, 0, (WORD) lpbi->biHeight,
(LPSTR)lpbi + (WORD)lpbi->biSize + PaletteSize((LPSTR)lpbi),
(LPBITMAPINFO)lpbi, DIB_RGB_COLORS))
{
GlobalUnlock(hNewDIB);
GlobalFree(hNewDIB);
hNewDIB = NULL;
}
/* Clean up and return */
if (hOldPal)
{
SelectPalette(hDC, hOldPal, TRUE);
RealizePalette(hDC);
ReleaseDC(NULL, hDC);
}
if (hNewDIB)
{
/* Unlock the new DIB's memory block */
GlobalUnlock(hNewDIB);
}
return hNewDIB;
}
/*************************************************************************
*
* LoadDIB()
*
* Loads the specified DIB from a file, allocates memory for it,
* and reads the disk file into the memory.
*
*
* Parameters:
*
* LPSTR 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.
*
* History: Date Author Reason
* 9/15/91 Mark Bader Based on DIBVIEW
*
*************************************************************************/
HDIB LoadDIB(LPSTR lpFileName)
{
HDIB hDIB;
int hFile;
OFSTRUCT ofs;
/*
* 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 = OpenFile(lpFileName, &ofs, OF_READ)) != -1)
{
hDIB = ReadDIBFile(hFile);
_lclose(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
*
* LPSTR lpFileName - pointer to full pathname to save DIB under
*
* Return value: 0 if successful, or one of:
* ERR_INVALIDHANDLE
* ERR_OPEN
* ERR_LOCK
*
* History:
*
* NOTE: The DIB API were not written to handle OS/2 DIBs, so this
* function will not save a file if it is not a Windows DIB.
*
* History: Date Author Reason
* 9/15/91 Mark Bader Taken from DIBVIEW (which was taken
* from SHOWDIB)
* 1/30/92 Mark Bader Fixed problem of writing too many
* bytes to the file
* 6/24/92 Mark Bader Added check for OS/2 DIB
*
*************************************************************************/
WORD SaveDIB(HDIB hDib, LPSTR lpFileName)
{
BITMAPFILEHEADER bmfHdr; // Header for Bitmap file
LPBITMAPINFOHEADER lpBI; // Pointer to DIB info structure
int fh; // file handle for opened file
OFSTRUCT of; // OpenFile structure
DWORD dwDIBSize;
DWORD dwError; // Error return from MyWrite
if (!hDib)
return ERR_INVALIDHANDLE;
fh = OpenFile(lpFileName, &of, OF_CREATE | OF_READWRITE);
if (fh == -1)
return ERR_OPEN;
/*
* Get a pointer to the DIB memory, the first of which contains
* a BITMAPINFO structure
*/
lpBI = (LPBITMAPINFOHEADER)GlobalLock(hDib);
if (!lpBI)
return ERR_LOCK;
// 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);
return ERR_NOT_DIB;
}
/*
* 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.
dwDIBSize = *(LPDWORD)lpBI + PaletteSize((LPSTR)lpBI); // Partial Calculation
// Now calculate the size of the image
if ((lpBI->biCompression == BI_RLE8) || (lpBI->biCompression == BI_RLE4)) {
// It's an RLE bitmap, we can't calculate size, so trust the
// biSizeImage field
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((LPSTR)lpBI);
/* Write the file header */
_lwrite(fh, (LPSTR)&bmfHdr, sizeof(BITMAPFILEHEADER));
/*
* Write the DIB header and the bits -- use local version of
* MyWrite, so we can write more than 32767 bytes of data
*/
dwError = MyWrite(fh, (LPSTR)lpBI, dwDIBSize);
GlobalUnlock(hDib);
_lclose(fh);
if (dwError == 0)
return ERR_OPEN; // oops, something happened in the write
else
return 0; // Success code
}
/*************************************************************************
*
* DestroyDIB ()
*
* Purpose: Frees memory associated with a DIB
*
* Returns: Nothing
*
* History: Date Author Reason
* 9/15/91 Mark Bader Created
*
*************************************************************************/
WORD DestroyDIB(HDIB hDib)
{
GlobalFree(hDib);
return 0;
}
//************************************************************************
//
// Auxiliary Functions which the above procedures use
//
//************************************************************************
/*************************************************************************
*
* 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.
*
* History: Date Author Reason
* 9/15/91 Mark Bader Based on DIBVIEW
* 6/25/92 Mark Bader Added check for OS/2 DIB
* 7/21/92 Mark Bader Added code to deal with bfOffBits
* field in BITMAPFILEHEADER
* 9/11/92 Mark Bader Fixed Realloc Code to free original mem
*
*************************************************************************/
HANDLE ReadDIBFile(int hFile)
{
BITMAPFILEHEADER bmfHeader;
UINT nNumColors; // Number of colors in table
HANDLE hDIB;
HANDLE hDIBtmp; // Used for GlobalRealloc() //MPB
LPBITMAPINFOHEADER lpbi;
DWORD offBits;
/*
* get length of DIB in bytes for use when reading
*/
// 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 (sizeof (BITMAPFILEHEADER) != _lread (hFile, (LPSTR)&bmfHeader, sizeof (BITMAPFILEHEADER)))
goto ErrExit;
if (bmfHeader.bfType != 0x4d42) /* 'BM' */
goto ErrExit;
// read the BITMAPINFOHEADER
if (sizeof(BITMAPINFOHEADER) != _lread (hFile, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
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
_lread (hFile, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
// 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)
_llseek(hFile, bmfHeader.bfOffBits, SEEK_SET);
if (MyRead(hFile, (LPSTR)lpbi + offBits, lpbi->biSizeImage))
goto OKExit;
ErrExit:
GlobalUnlock(hDIB);
ErrExitNoUnlock:
GlobalFree(hDIB);
return NULL;
OKExit:
GlobalUnlock(hDIB);
return hDIB;
}
/*************************************************************************
Function: MyRead (int, LPSTR, DWORD)
Purpose: Routine to read files greater than 64K in size.
Returns: TRUE if successful.
FALSE if an error occurs.
History: Date Author Reason
9/15/91 Mark Bader Based on DIBVIEW
*************************************************************************/
bool MyRead(int hFile, LPSTR lpBuffer, DWORD dwSize)
{
char *lpInBuf = (char *)lpBuffer;
int nBytes;
/*
* Read in the data in 32767 byte chunks (or a smaller amount if it's
* the last chunk of data read)
*/
while (dwSize)
{
nBytes = (int)(dwSize > (DWORD)32767 ? 32767 : LOWORD (dwSize));
if (_lread(hFile, (LPSTR)lpInBuf, nBytes) != (WORD)nBytes)
return FALSE;
dwSize -= nBytes;
lpInBuf += nBytes;
}
return TRUE;
}
/****************************************************************************
FUNCTION : MyWrite(int fh, VOID *pv, DWORD ul)
PURPOSE : Writes data in steps of 32k till all the data is written.
Normal _lwrite uses a WORD as 3rd parameter, so it is
limited to 32767 bytes, but this procedure is not.
RETURNS : 0 - If write did not proceed correctly.
number of bytes written otherwise.
History: Date Author Reason
9/15/91 Mark Bader Based on DIBVIEW
****************************************************************************/
DWORD PASCAL MyWrite(int iFileHandle, VOID *lpBuffer, DWORD dwBytes)
{
DWORD dwBytesTmp = dwBytes; // Save # of bytes for return value
BYTE *hpBuffer = (BYTE *)lpBuffer; // make a huge pointer to the data
/*
* Write out the data in 32767 byte chunks.
*/
while (dwBytes > 32767)
{
if (_lwrite(iFileHandle, (LPSTR)hpBuffer, (WORD)32767) != 32767)
return 0;
dwBytes -= 32767;
hpBuffer += 32767;
}
/* Write out the last chunk (which is < 32767 bytes) */
if (_lwrite(iFileHandle, (LPSTR)hpBuffer, (WORD)dwBytes) != (WORD)dwBytes)
return 0;
return dwBytesTmp;
}
}
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