AuroraMiddleware/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
b75dd496d2
wxWidgets/src/msw/dib.cpp
Julian Smart 448af9a46e Cosmetic changes in setup0.h; Latex edits; PaletteSize -> wxPaletteSize; 
generate newgrid VC++ project files


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4179 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
1999-10-25 13:46:48 +00:00

946 lines
26 KiB
C++
Raw Blame History

/*******************************************************************************
* *
* MODULE : DIB.CC *
* *
* DESCRIPTION : Routines for dealing with Device Independent Bitmaps. *
* *
* FUNCTIONS : *
* *
* wxReadDIB() - Reads a DIB *
* *
* WriteDIB() - Writes a global handle in CF_DIB format*
* to a file. *
* *
* wxPaletteSize() - Calculates the palette size in bytes *
* of given DIB *
* *
* DibNumColors() - Determines the number of colors in DIB *
* *
* DibFromBitmap() - Creates a DIB repr. the DDB passed in. *
* *
* *
* lread() - Private routine to read more than 64k *
* *
* lwrite() - Private routine to write more than 64k *
* *
*******************************************************************************/
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#if defined(__BORLANDC__)
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/setup.h"
#include "wx/defs.h"
#include "wx/bitmap.h"
#endif
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#if !defined(__MWERKS__) && !defined(__SALFORDC__)
#include <memory.h>
#endif
#include "wx/msw/dib.h"
#ifndef __TWIN32__
#ifndef wxUSE_NORLANDER_HEADERS
#ifdef __GNUWIN32__
#include "wx/msw/gnuwin32/extra.h"
#endif
#endif
#endif
#ifndef SEEK_CUR
/* flags for _lseek */
#define SEEK_CUR 1
#define SEEK_END 2
#define SEEK_SET 0
#endif
#define MAXREAD 32768 /* Number of bytes to be read during */
/* each read operation. */
/* Header signatutes for various resources */
#define BFT_ICON 0x4349 /* 'IC' */
#define BFT_BITMAP 0x4d42 /* 'BM' */
#define BFT_CURSOR 0x5450 /* 'PT(' */
/* macro to determine if resource is a DIB */
#define ISDIB(bft) ((bft) == BFT_BITMAP)
/* Macro to align given value to the closest DWORD (unsigned long ) */
#define ALIGNULONG(i) ((i+3)/4*4)
/* Macro to determine to round off the given value to the closest byte */
#define WIDTHBYTES(i) ((i+31)/32*4)
#define PALVERSION 0x300
#define MAXPALETTE 256 /* max. # supported palette entries */
static DWORD PASCAL lread(int fh, VOID FAR *pv, DWORD ul);
static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul);
static BOOL WriteDIB (LPTSTR szFile,HANDLE hdib);
WORD wxPaletteSize (VOID FAR * pv); // This is non-static as some apps use it externally
static WORD DibNumColors (VOID FAR * pv);
// HANDLE DibFromBitmap (HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal);
static BOOL PASCAL MakeBitmapAndPalette(HDC,HANDLE,HPALETTE *,HBITMAP *);
/****************************************************************************
* *
* FUNCTION : WriteDIB(LPSTR szFile,HANDLE hdib) *
* *
* PURPOSE : Write a global handle in CF_DIB format to a file. *
* *
* RETURNS : TRUE - if successful. *
* FALSE - otherwise *
* *
****************************************************************************/
static BOOL WriteDIB(LPTSTR szFile, HANDLE hdib)
{
BITMAPFILEHEADER hdr;
LPBITMAPINFOHEADER lpbi;
int fh;
OFSTRUCT of;
if (!hdib)
return FALSE;
fh = OpenFile(wxFNCONV(szFile), &of, OF_CREATE | OF_READWRITE);
if (fh == -1)
return FALSE;
#ifdef __WINDOWS_386__
lpbi = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hdib));
#else
lpbi = (LPBITMAPINFOHEADER) GlobalLock(hdib);
#endif
/* Fill in the fields of the file header */
hdr.bfType = BFT_BITMAP;
hdr.bfSize = GlobalSize(hdib) + sizeof(BITMAPFILEHEADER);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + lpbi->biSize +
wxPaletteSize(lpbi);
/* Write the file header */
_lwrite(fh, (LPSTR) &hdr, sizeof(BITMAPFILEHEADER));
/* Write the DIB header and the bits */
lwrite(fh, (LPSTR) lpbi, GlobalSize(hdib));
GlobalUnlock(hdib);
_lclose(fh);
return TRUE;
}
/****************************************************************************
* *
* FUNCTION : wxPaletteSize(VOID FAR * pv) *
* *
* PURPOSE : Calculates the palette size in bytes. If the info. block *
* is of the BITMAPCOREHEADER type, the number of colors is *
* multiplied by 3 to give the palette size, otherwise the *
* number of colors is multiplied by 4. *
* *
* RETURNS : Palette size in number of bytes. *
* *
****************************************************************************/
WORD wxPaletteSize(VOID FAR * pv)
{
LPBITMAPINFOHEADER lpbi;
WORD NumColors;
lpbi = (LPBITMAPINFOHEADER) pv;
NumColors = DibNumColors(lpbi);
if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
return NumColors * sizeof(RGBTRIPLE);
else
return NumColors * sizeof(RGBQUAD);
}
/****************************************************************************
* *
* FUNCTION : DibNumColors(VOID FAR * pv) *
* *
* PURPOSE : Determines the number of colors in the DIB by looking at *
* the BitCount filed in the info block. *
* *
* RETURNS : The number of colors in the DIB. *
* *
****************************************************************************/
static WORD DibNumColors(VOID FAR *pv)
{
int bits;
BITMAPINFOHEADER *lpbi;
BITMAPCOREHEADER *lpbc;
lpbi = ((BITMAPINFOHEADER*) pv);
lpbc = ((BITMAPCOREHEADER*) pv);
/* With the BITMAPINFO format headers, the size of the palette
* is in biClrUsed, whereas in the BITMAPCORE - style headers, it
* is dependent on the bits per pixel ( = 2 raised to the power of
* bits/pixel).
*/
if (lpbi->biSize != sizeof(BITMAPCOREHEADER)) {
if (lpbi->biClrUsed != 0)
return (WORD) lpbi->biClrUsed;
bits = lpbi->biBitCount;
}
else
bits = lpbc->bcBitCount;
switch (bits) {
case 1:
return 2;
case 4:
return 16;
case 8:
return 256;
default:
/* A 24 bitcount DIB has no color table */
return 0;
}
}
/****************************************************************************
* *
* FUNCTION : DibFromBitmap() *
* *
* PURPOSE : Will create a global memory block in DIB format that *
* represents the Device-dependent bitmap (DDB) passed in. *
* *
* RETURNS : A handle to the DIB *
* *
****************************************************************************/
#if NOTHING
static HANDLE DibFromBitmap(HBITMAP hbm, DWORD biStyle, WORD biBits, HPALETTE hpal)
{
BITMAP bm;
BITMAPINFOHEADER bi;
BITMAPINFOHEADER FAR *lpbi;
DWORD dwLen;
HANDLE hdib;
HANDLE h;
HDC hdc;
if (!hbm)
return NULL;
if (hpal == NULL)
hpal = GetStockObject(DEFAULT_PALETTE);
GetObject(hbm, sizeof (bm), (LPSTR) &bm);
if (biBits == 0)
biBits = bm.bmPlanes * bm.bmBitsPixel;
bi.biSize = sizeof(BITMAPINFOHEADER);
bi.biWidth = bm.bmWidth;
bi.biHeight = bm.bmHeight;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biCompression = biStyle;
bi.biSizeImage = 0;
bi.biXPelsPerMeter = 0;
bi.biYPelsPerMeter = 0;
bi.biClrUsed = 0;
bi.biClrImportant = 0;
dwLen = bi.biSize + wxPaletteSize(&bi);
hdc = GetDC((HWND) NULL);
hpal = SelectPalette(hdc, hpal, FALSE);
RealizePalette(hdc);
hdib = GlobalAlloc(GHND, dwLen);
if (!hdib) {
SelectPalette(hdc, hpal, FALSE);
ReleaseDC(NULL, hdc);
return NULL;
}
#ifdef __WINDOWS_386__
lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
#else
lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
#endif
*lpbi = bi;
/* call GetDIBits with a NULL lpBits param, so it will calculate the
* biSizeImage field for us
*/
GetDIBits(hdc, hbm, 0, (WORD) bi.biHeight,
NULL, (LPBITMAPINFO) lpbi, DIB_RGB_COLORS);
bi = *lpbi;
GlobalUnlock(hdib);
/* If the driver did not fill in the biSizeImage field, make one up */
if (bi.biSizeImage == 0) {
bi.biSizeImage = WIDTHBYTES((DWORD)bm.bmWidth * biBits) * bm.bmHeight;
if (biStyle != BI_RGB)
bi.biSizeImage = (bi.biSizeImage * 3) / 2;
}
/* realloc the buffer big enough to hold all the bits */
dwLen = bi.biSize + wxPaletteSize(&bi) + bi.biSizeImage;
if (h = GlobalReAlloc(hdib, dwLen, 0))
hdib = h;
else {
GlobalFree(hdib);
hdib = NULL;
SelectPalette(hdc, hpal, FALSE);
ReleaseDC(NULL, hdc);
return hdib;
}
/* call GetDIBits with a NON-NULL lpBits param, and actualy get the
* bits this time
*/
#ifdef __WINDOWS_386__
lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
#else
lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
#endif
if (GetDIBits(hdc,
hbm,
0,
(WORD) bi.biHeight,
(LPSTR) lpbi + (WORD) lpbi->biSize + wxPaletteSize(lpbi),
(LPBITMAPINFO) lpbi, DIB_RGB_COLORS) == 0) {
GlobalUnlock(hdib);
hdib = NULL;
SelectPalette(hdc, hpal, FALSE);
ReleaseDC((HWND) NULL, hdc);
return NULL;
}
bi = *lpbi;
GlobalUnlock(hdib);
SelectPalette(hdc, hpal, FALSE);
ReleaseDC(NULL, hdc);
return hdib;
}
#endif
/************* PRIVATE ROUTINES TO READ/WRITE MORE THAN 64K ***************/
/****************************************************************************
* *
* FUNCTION : lread(int fh, VOID FAR *pv, DWORD ul) *
* *
* PURPOSE : Reads data in steps of 32k till all the data has been read.*
* *
* RETURNS : 0 - If read did not proceed correctly. *
* number of bytes read otherwise. *
* *
****************************************************************************/
static DWORD PASCAL lread(int fh, void far *pv, DWORD ul)
{
DWORD ulT = ul;
#if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__) || defined(__WXWINE__)
BYTE *hp = (BYTE *) pv;
#else
BYTE huge *hp = (BYTE huge *) pv;
#endif
while (ul > (DWORD) MAXREAD) {
if (_lread(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
return 0;
ul -= MAXREAD;
hp += MAXREAD;
}
if (_lread(fh, (LPSTR) hp, (WORD) ul) != (WORD) ul)
return 0;
return ulT;
}
/****************************************************************************
* *
* FUNCTION : lwrite(int fh, VOID FAR *pv, DWORD ul) *
* *
* PURPOSE : Writes data in steps of 32k till all the data is written. *
* *
* RETURNS : 0 - If write did not proceed correctly. *
* number of bytes written otherwise. *
* *
****************************************************************************/
static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul)
{
DWORD ulT = ul;
#if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__) || defined(__WXWINE__)
BYTE *hp = (BYTE *) pv;
#else
BYTE huge *hp = (BYTE huge *) pv;
#endif
while (ul > MAXREAD) {
if (_lwrite(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
return 0;
ul -= MAXREAD;
hp += MAXREAD;
}
if (_lwrite(fh, (LPSTR) hp, (WORD) ul) != (WORD) ul)
return 0;
return ulT;
}
/****************************************************************************
*
* FUNCTION : ReadDIB(hWnd)
*
* PURPOSE : Reads a DIB from a file, obtains a handle to its
* BITMAPINFO struct. and loads the DIB. Once the DIB
* is loaded, the function also creates a bitmap and
* palette out of the DIB for a device-dependent form.
*
* RETURNS : TRUE - DIB loaded and bitmap/palette created
* The DIBINIT structure pointed to by pInfo is
* filled with the appropriate handles.
* FALSE - otherwise
*
****************************************************************************/
BOOL wxReadDIB(LPTSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette)
{
int fh;
LPBITMAPINFOHEADER lpbi;
OFSTRUCT of;
BITMAPFILEHEADER bf;
WORD nNumColors;
BOOL result = FALSE;
wxChar str[128];
WORD offBits;
HDC hDC;
BOOL bCoreHead = FALSE;
HANDLE hDIB = 0;
/* Open the file and get a handle to it's BITMAPINFO */
fh = OpenFile (wxFNCONV(lpFileName), &of, OF_READ);
if (fh == -1) {
wsprintf(str,wxT("Can't open file '%s'"), lpFileName);
MessageBox(NULL, str, wxT("Error"), MB_ICONSTOP | MB_OK);
return (0);
}
hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) +
256 * sizeof(RGBQUAD)));
if (!hDIB)
return(0);
#ifdef __WINDOWS_386__
lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
#else
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
#endif
/* read the BITMAPFILEHEADER */
if (sizeof (bf) != _lread (fh, (LPSTR)&bf, sizeof (bf)))
goto ErrExit;
if (bf.bfType != 0x4d42) /* 'BM' */
goto ErrExit;
if (sizeof(BITMAPCOREHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPCOREHEADER)))
goto ErrExit;
if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
{
lpbi->biSize = sizeof(BITMAPINFOHEADER);
lpbi->biBitCount = ((LPBITMAPCOREHEADER)lpbi)->bcBitCount;
lpbi->biPlanes = ((LPBITMAPCOREHEADER)lpbi)->bcPlanes;
lpbi->biHeight = ((LPBITMAPCOREHEADER)lpbi)->bcHeight;
lpbi->biWidth = ((LPBITMAPCOREHEADER)lpbi)->bcWidth;
bCoreHead = TRUE;
}
else
{
// get to the start of the header and read INFOHEADER
_llseek(fh,sizeof(BITMAPFILEHEADER),SEEK_SET);
if (sizeof(BITMAPINFOHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
goto ErrExit;
}
nNumColors = (WORD)lpbi->biClrUsed;
if ( nNumColors == 0 )
{
/* 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);
hDIB = GlobalReAlloc(hDIB, lpbi->biSize +
nNumColors * sizeof(RGBQUAD) +
lpbi->biSizeImage, 0);
if (!hDIB) /* can't resize buffer for loading */
goto ErrExit2;
#ifdef __WINDOWS_386__
lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
#else
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
#endif
/* read the color table */
if (!bCoreHead)
_lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
else
{
signed int i;
RGBQUAD FAR *pQuad;
RGBTRIPLE FAR *pTriple;
_lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBTRIPLE));
pQuad = (RGBQUAD FAR *)((LPSTR)lpbi + lpbi->biSize);
pTriple = (RGBTRIPLE FAR *) pQuad;
for (i = nNumColors - 1; i >= 0; i--)
{
pQuad[i].rgbRed = pTriple[i].rgbtRed;
pQuad[i].rgbBlue = pTriple[i].rgbtBlue;
pQuad[i].rgbGreen = pTriple[i].rgbtGreen;
pQuad[i].rgbReserved = 0;
}
}
/* offset to the bits from start of DIB header */
offBits = (WORD)lpbi->biSize + nNumColors * sizeof(RGBQUAD);
if (bf.bfOffBits != 0L)
{
_llseek(fh,bf.bfOffBits,SEEK_SET);
}
if (lpbi->biSizeImage == lread(fh, (LPSTR)lpbi + offBits, lpbi->biSizeImage))
{
GlobalUnlock(hDIB);
hDC = GetDC(NULL);
if (!MakeBitmapAndPalette(hDC, hDIB, palette,
bitmap))
{
ReleaseDC(NULL,hDC);
goto ErrExit2;
}
else
{
ReleaseDC(NULL,hDC);
GlobalFree(hDIB);
result = TRUE;
}
}
else
{
ErrExit:
GlobalUnlock(hDIB);
ErrExit2:
GlobalFree(hDIB);
}
_lclose(fh);
return(result);
}
/****************************************************************************
*
* FUNCTION : MakeBitmapAndPalette
*
* PURPOSE : Given a DIB, creates a bitmap and corresponding palette
* to be used for a device-dependent representation of
* of the image.
*
* RETURNS : TRUE --> success. phPal and phBitmap are filled with
* appropriate handles. Caller is responsible
* for freeing objects.
* FALSE --> unable to create objects. both pointer are
* not valid
*
****************************************************************************/
static BOOL PASCAL MakeBitmapAndPalette(HDC hDC, HANDLE hDIB,
HPALETTE * phPal, HBITMAP * phBitmap)
{
LPBITMAPINFOHEADER lpInfo;
BOOL result = FALSE;
HBITMAP hBitmap;
HPALETTE hPalette, hOldPal;
LPSTR lpBits;
#ifdef __WINDOWS_386__
lpInfo = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock(hDIB));
#else
lpInfo = (LPBITMAPINFOHEADER) GlobalLock(hDIB);
#endif
hPalette = wxMakeDIBPalette(lpInfo);
if ( hPalette )
{
// Need to realize palette for converting DIB to bitmap.
hOldPal = SelectPalette(hDC, hPalette, TRUE);
RealizePalette(hDC);
lpBits = (LPSTR)lpInfo + (WORD)lpInfo->biSize +
(WORD)lpInfo->biClrUsed * sizeof(RGBQUAD);
hBitmap = CreateDIBitmap(hDC, lpInfo, CBM_INIT, lpBits,
(LPBITMAPINFO)lpInfo, DIB_RGB_COLORS);
SelectPalette(hDC, hOldPal, TRUE);
RealizePalette(hDC);
if (!hBitmap)
DeleteObject(hPalette);
else
{
*phBitmap = hBitmap;
*phPal = hPalette;
result = TRUE;
}
}
return(result);
}
/****************************************************************************
* *
* FUNCTION : wxMakeDIBPalette(lpInfo) *
* *
* PURPOSE : Given a BITMAPINFOHEADER, create a palette based on
* the color table.
*
* *
* RETURNS : non-zero - handle of a corresponding palette
* zero - unable to create palette
* *
****************************************************************************/
HPALETTE wxMakeDIBPalette(LPBITMAPINFOHEADER lpInfo)
{
#ifdef __WXWINE__
return (FALSE);
#else
LPLOGPALETTE npPal;
RGBQUAD far *lpRGB;
HPALETTE hLogPal;
WORD i;
/* since biClrUsed field was filled during the loading of the DIB,
** we know it contains the number of colors in the color table.
*/
if (lpInfo->biClrUsed)
{
/*
npPal = (NPLOGPALETTE)LocalAlloc(LMEM_FIXED, sizeof(LOGPALETTE) +
(WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
*/
npPal = (LPLOGPALETTE)malloc(sizeof(LOGPALETTE) +
(WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
if (!npPal)
return(FALSE);
npPal->palVersion = 0x300;
npPal->palNumEntries = (WORD)lpInfo->biClrUsed;
/* get pointer to the color table */
lpRGB = (RGBQUAD FAR *)((LPSTR)lpInfo + lpInfo->biSize);
/* copy colors from the color table to the LogPalette structure */
for (i = 0; i < lpInfo->biClrUsed; i++, lpRGB++)
{
npPal->palPalEntry[i].peRed = lpRGB->rgbRed;
npPal->palPalEntry[i].peGreen = lpRGB->rgbGreen;
npPal->palPalEntry[i].peBlue = lpRGB->rgbBlue;
npPal->palPalEntry[i].peFlags = 0;
}
hLogPal = CreatePalette((LPLOGPALETTE)npPal);
// LocalFree((HANDLE)npPal);
free(npPal);
return(hLogPal);
}
/* 24-bit DIB with no color table. return default palette. Another
** option would be to create a 256 color "rainbow" palette to provide
** some good color choices.
*/
else
return((HPALETTE) GetStockObject(DEFAULT_PALETTE));
#endif
}
bool wxLoadIntoBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette **pal)
{
HBITMAP hBitmap;
HPALETTE hPalette;
bool success = (wxReadDIB(filename, &hBitmap, &hPalette) != 0);
if (!success)
{
DeleteObject(hPalette);
return FALSE;
}
if (hPalette)
{
if (pal)
{
*pal = new wxPalette;
(*pal)->SetHPALETTE((WXHPALETTE) hPalette);
}
else
DeleteObject(hPalette);
}
else if (pal)
*pal = NULL;
if (hBitmap)
{
BITMAP bm;
GetObject(hBitmap, sizeof(bm), (LPSTR)&bm);
bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
bitmap->SetWidth(bm.bmWidth);
bitmap->SetHeight(bm.bmHeight);
bitmap->SetDepth(bm.bmPlanes * bm.bmBitsPixel);
bitmap->SetOk(TRUE);
return TRUE;
}
else return FALSE;
}
wxBitmap *wxLoadBitmap(wxChar *filename, wxPalette **pal)
{
wxBitmap *bitmap = new wxBitmap;
if (wxLoadIntoBitmap(filename, bitmap, pal))
return bitmap;
else
{
delete bitmap;
return NULL;
}
}
//---------------------------------------------------------------------
//
// Function: InitBitmapInfoHeader
//
// Purpose: Does a "standard" initialization of a BITMAPINFOHEADER,
// given the Width, Height, and Bits per Pixel for the
// DIB.
//
// By standard, I mean that all the relevant fields are set
// to the specified values. biSizeImage is computed, the
// biCompression field is set to "no compression," and all
// other fields are 0.
//
// Note that DIBs only allow BitsPixel values of 1, 4, 8, or
// 24. This routine makes sure that one of these values is
// used (whichever is most appropriate for the specified
// nBPP).
//
// Parms: lpBmInfoHdr == Far pointer to a BITMAPINFOHEADER structure
// to be filled in.
// dwWidth == Width of DIB (not in Win 3.0 & 3.1, high
// word MUST be 0).
// dwHeight == Height of DIB (not in Win 3.0 & 3.1, high
// word MUST be 0).
// nBPP == Bits per Pixel for the DIB.
//
// History: Date Reason
// 11/07/91 Created
//
//---------------------------------------------------------------------
static void InitBitmapInfoHeader (LPBITMAPINFOHEADER lpBmInfoHdr,
DWORD dwWidth,
DWORD dwHeight,
int nBPP)
{
// _fmemset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
memset (lpBmInfoHdr, 0, sizeof (BITMAPINFOHEADER));
lpBmInfoHdr->biSize = sizeof (BITMAPINFOHEADER);
lpBmInfoHdr->biWidth = dwWidth;
lpBmInfoHdr->biHeight = dwHeight;
lpBmInfoHdr->biPlanes = 1;
if (nBPP <= 1)
nBPP = 1;
else if (nBPP <= 4)
nBPP = 4;
else if (nBPP <= 8)
nBPP = 8;
/* Doesn't work
else if (nBPP <= 16)
nBPP = 16;
*/
else
nBPP = 24;
lpBmInfoHdr->biBitCount = nBPP;
lpBmInfoHdr->biSizeImage = WIDTHBYTES (dwWidth * nBPP) * dwHeight;
}
LPSTR wxFindDIBBits (LPSTR lpbi)
{
return (lpbi + *(LPDWORD)lpbi + wxPaletteSize (lpbi));
}
//---------------------------------------------------------------------
//
// Function: BitmapToDIB
//
// Purpose: Given a device dependent bitmap and a palette, returns
// a handle to global memory with a DIB spec in it. The
// DIB is rendered using the colors of the palette passed in.
//
// Stolen almost verbatim from ShowDIB.
//
// Parms: hBitmap == Handle to device dependent bitmap compatible
// with default screen display device.
// hPal == Palette to render the DDB with. If it's NULL,
// use the default palette.
//
// History: Date Reason
// 6/01/91 Created
//
//---------------------------------------------------------------------
HANDLE wxBitmapToDIB (HBITMAP hBitmap, HPALETTE hPal)
{
BITMAP Bitmap;
BITMAPINFOHEADER bmInfoHdr;
LPBITMAPINFOHEADER lpbmInfoHdr;
LPSTR lpBits;
HDC hMemDC;
HANDLE hDIB;
HPALETTE hOldPal = NULL;
// Do some setup -- make sure the Bitmap passed in is valid,
// get info on the bitmap (like its height, width, etc.),
// then setup a BITMAPINFOHEADER.
if (!hBitmap)
return NULL;
if (!GetObject (hBitmap, sizeof (Bitmap), (LPSTR) &Bitmap))
return NULL;
InitBitmapInfoHeader (&bmInfoHdr,
Bitmap.bmWidth,
Bitmap.bmHeight,
Bitmap.bmPlanes * Bitmap.bmBitsPixel);
// Now allocate memory for the DIB. Then, set the BITMAPINFOHEADER
// into this memory, and find out where the bitmap bits go.
hDIB = GlobalAlloc (GHND, sizeof (BITMAPINFOHEADER) +
wxPaletteSize ((LPSTR) &bmInfoHdr) + bmInfoHdr.biSizeImage);
if (!hDIB)
return NULL;
#ifdef __WINDOWS_386__
lpbmInfoHdr = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock (hDIB));
#else
lpbmInfoHdr = (LPBITMAPINFOHEADER) GlobalLock (hDIB);
#endif
*lpbmInfoHdr = bmInfoHdr;
lpBits = wxFindDIBBits ((LPSTR) lpbmInfoHdr);
// Now, we need a DC to hold our bitmap. If the app passed us
// a palette, it should be selected into the DC.
hMemDC = GetDC (NULL);
if (hPal)
{
hOldPal = SelectPalette (hMemDC, hPal, FALSE);
RealizePalette (hMemDC);
}
// We're finally ready to get the DIB. Call the driver and let
// it party on our bitmap. It will fill in the color table,
// and bitmap bits of our global memory block.
if (!GetDIBits (hMemDC,
hBitmap,
0,
Bitmap.bmHeight,
lpBits,
(LPBITMAPINFO) lpbmInfoHdr,
DIB_RGB_COLORS))
{
GlobalUnlock (hDIB);
GlobalFree (hDIB);
hDIB = NULL;
}
else
GlobalUnlock (hDIB);
// Finally, clean up and return.
if (hOldPal)
SelectPalette (hMemDC, hOldPal, FALSE);
ReleaseDC (NULL, hMemDC);
return hDIB;
}
bool wxSaveBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette *colourmap)
{
HPALETTE hPalette = 0;
if (colourmap)
hPalette = (HPALETTE) colourmap->GetHPALETTE();
HANDLE dibHandle = wxBitmapToDIB((HBITMAP) bitmap->GetHBITMAP(), hPalette);
if (dibHandle)
{
bool success = (WriteDIB(filename, dibHandle) != 0);
GlobalFree(dibHandle);
return success;
}
else return FALSE;
}
Reference in New Issue View Git Blame Copy Permalink