AuroraMiddleware/wxWidgets
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

added wxDIB::Save() and wxDIB to/from wxBitmap) conversions, use them instead of the old C functions (the latter were removed, there is no old code left any more)

Browse Source 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19744 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2003-03-23 21:33:21 +00:00
parent 26f0e9e2e4
commit 2b254edf9c
6 changed files with 169 additions and 718 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
include/wx/msw/dib.h
View File

@ -35,6 +35,10 @@ public:
wxDIB(int width, int height, int depth)
{ Init(); (void)Create(width, height, depth); }
// create a DIB from the DDB
wxDIB(const wxBitmap& bmp)
{ Init(); (void)Create(bmp); }
// load a DIB from file (any depth is supoprted here unlike above)
//
// as above, use IsOk() to see if the bitmap was loaded successfully
@ -43,6 +47,7 @@ public:
// same as the corresponding ctors but with return value
bool Create(int width, int height, int depth);
bool Create(const wxBitmap& bmp);
bool Load(const wxString& filename);
// dtor is not virtual, this class is not meant to be used polymorphically
@ -66,6 +71,9 @@ public:
wxPalette *CreatePalette() const;
#endif // wxUSE_PALETTE
// save the DIB as a .BMP file to the file with the given name
bool Save(const wxString& filename);
// accessors
// ---------
@ -92,8 +100,8 @@ public:
// HBITMAP conversion
// ------------------
// these functions are only used by wxBitmapDataObject implementation in
// src/msw/ole/dataobj.cpp, don't use them directly if possible
// these functions are only used by wxWindows internally right now, please
// don't use them directly if possible as they're subject to change
// creates a DDB compatible with the given (or screen) DC from either
// a plain DIB or a DIB section (in which case the last parameter must be
@ -102,12 +110,18 @@ public:
HDC hdc = 0,
void *bits = NULL);
// create a plain DIB (not a DIB section) from a DDB, the caller is
// responsable for freeing it using ::GlobalFree()
static HGLOBAL ConvertFromBitmap(HBITMAP hbmp);
// creates a DIB from the given DDB or calculates the space needed by it:
// if pbi is NULL, only the space is calculated, otherwise pbi is supposed
// to point at BITMAPINFO of the correct size which is filled by this
// function
// function (this overload is needed for wxBitmapDataObject code in
// src/msw/ole/dataobj.cpp)
static size_t ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp);
// wxImage conversion
// ------------------
@ -199,16 +213,5 @@ inline wxDIB::~wxDIB()
Free();
}
// the rest is defined in dib.cpp
// Save (device dependent) wxBitmap as a DIB
bool wxSaveBitmap(wxChar *filename, wxBitmap *bitmap, wxPalette *palette = NULL);
HANDLE wxBitmapToDIB (HBITMAP hBitmap, HPALETTE hPal);
bool wxReadDIB(LPTSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette);
HANDLE wxReadDIB2(LPTSTR lpFileName);
LPSTR wxFindDIBBits (LPSTR lpbi);
HPALETTE wxMakeDIBPalette(LPBITMAPINFOHEADER lpInfo);
#endif // _WX_MSW_DIB_H_

1
src/msw/bitmap.cpp
View File

@ -487,7 +487,6 @@ bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
hbmp = dib.Detach();
GetBitmapData()->m_depth = d;
GetBitmapData()->m_hasAlpha = d == 32; // 32bpp DIBs have alpha channel
}
else // create a DDB
{

12
src/msw/clipbrd.cpp
View File

@ -220,13 +220,13 @@ bool wxSetClipboardData(wxDataFormat dataFormat,
case wxDF_DIB:
{
#if wxUSE_IMAGE_LOADING_IN_MSW
wxBitmap *bitmap = (wxBitmap *)data;
HBITMAP hBitmap = (HBITMAP)bitmap->GetHBITMAP();
// NULL palette means to use the system one
HANDLE hDIB = wxBitmapToDIB(hBitmap, (HPALETTE)NULL);
handle = SetClipboardData(CF_DIB, hDIB);
#endif // wxUSE_IMAGE_LOADING_IN_MSW
HGLOBAL hDIB = wxDIB::ConvertFromBitmap(GetHbitmapOf(*bitmap));
if ( hDIB )
{
handle = ::SetClipboardData(CF_DIB, hDIB);
}
break;
}

802
src/msw/dib.cpp
View File

@ -9,6 +9,13 @@
// License: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
/*
TODO: support for palettes is very incomplete, several functions simply
ignore them (we should select and realize the palette, if any, before
caling GetDIBits() in the DC we use with it and we shouldn't use
GetBitmapBits() at all because we can't do it with it)
*/
// ============================================================================
// declarations
// ============================================================================
@ -31,6 +38,7 @@
#include "wx/bitmap.h"
#include "wx/intl.h"
#include "wx/file.h"
#include <stdio.h>
#include <stdlib.h>
@ -120,6 +128,35 @@ bool wxDIB::Create(int width, int height, int depth)
return true;
}
bool wxDIB::Create(const wxBitmap& bmp)
{
wxCHECK_MSG( bmp.Ok(), false, _T("wxDIB::Create(): invalid bitmap") );
const int w = bmp.GetWidth();
const int h = bmp.GetHeight();
int d = bmp.GetDepth();
if ( d == -1 )
d = wxDisplayDepth();
if ( !Create(w, h, d) )
return false;
// we could have used GetDIBits() too but GetBitmapBits() is simpler
if ( !::GetBitmapBits
(
GetHbitmapOf(bmp), // the source DDB
GetLineSize(w, d)*h, // the number of bytes to copy
m_data // the pixels will be copied here
) )
{
wxLogLastError(wxT("GetDIBits()"));
return 0;
}
return true;
}
// ----------------------------------------------------------------------------
// Loading/saving the DIBs
// ----------------------------------------------------------------------------
@ -144,6 +181,48 @@ bool wxDIB::Load(const wxString& filename)
return true;
}
bool wxDIB::Save(const wxString& filename)
{
wxCHECK_MSG( m_handle, false, _T("wxDIB::Save(): invalid object") );
wxFile file(filename, wxFile::write);
bool ok = file.IsOpened();
if ( ok )
{
DIBSECTION ds;
if ( !::GetObject(m_handle, sizeof(ds), &ds) )
{
wxLogLastError(_T("GetObject(hDIB)"));
}
else
{
BITMAPFILEHEADER bmpHdr;
wxZeroMemory(bmpHdr);
const size_t sizeHdr = ds.dsBmih.biSize;
const size_t sizeImage = ds.dsBmih.biSizeImage;
bmpHdr.bfType = 0x4d42; // 'BM' in little endian
bmpHdr.bfOffBits = sizeof(BITMAPFILEHEADER) + ds.dsBmih.biSize;
bmpHdr.bfSize = bmpHdr.bfOffBits + sizeImage;
// first write the file header, then the bitmap header and finally the
// bitmap data itself
ok = file.Write(&bmpHdr, sizeof(bmpHdr)) == sizeof(bmpHdr) &&
file.Write(&ds.dsBmih, sizeHdr) == sizeHdr &&
file.Write(ds.dsBm.bmBits, sizeImage) == sizeImage;
}
}
if ( !ok )
{
wxLogError(_("Failed to save the bitmap image to file \"%s\"."),
filename.c_str());
}
return ok;
}
// ----------------------------------------------------------------------------
// wxDIB accessors
// ----------------------------------------------------------------------------
@ -254,16 +333,11 @@ size_t wxDIB::ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp)
return 0;
}
// calculate the number of bits per pixel and the number of items in
// bmiColors array (whose meaning depends on the bitmap format)
WORD biBits = bm.bmPlanes * bm.bmBitsPixel;
WORD biColors = wxGetNumOfBitmapColors(biBits);
// we need a BITMAPINFO anyhow and if we're not given a pointer to it we
// use this one
BITMAPINFO bi2;
bool wantSizeOnly = pbi == NULL;
const bool wantSizeOnly = pbi == NULL;
if ( wantSizeOnly )
pbi = &bi2;
@ -277,36 +351,67 @@ size_t wxDIB::ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp)
bi.biWidth = bm.bmWidth;
bi.biHeight = h;
bi.biPlanes = 1;
bi.biBitCount = biBits;
bi.biBitCount = bm.bmBitsPixel;
// memory we need for BITMAPINFO only
DWORD dwLen = bi.biSize + biColors * sizeof(RGBQUAD);
DWORD dwLen = bi.biSize + wxGetNumOfBitmapColors(bm.bmBitsPixel) * sizeof(RGBQUAD);
// first get the image size
ScreenHDC hdc;
if ( !::GetDIBits(hdc, hbmp, 0, h, NULL, pbi, DIB_RGB_COLORS) )
// get either just the image size or the image bits
if ( !::GetDIBits
(
ScreenHDC(), // the DC to use
hbmp, // the source DDB
0, // first scan line
h, // number of lines to copy
wantSizeOnly ? NULL // pointer to the buffer or
: (char *)pbi + dwLen, // NULL if we don't have it
pbi, // bitmap header
DIB_RGB_COLORS // or DIB_PAL_COLORS
) )
{
wxLogLastError(wxT("GetDIBits(NULL)"));
wxLogLastError(wxT("GetDIBits()"));
return 0;
}
if ( !wantSizeOnly )
{
// and now copy the bits
void *image = (char *)pbi + dwLen;
if ( !::GetDIBits(hdc, hbmp, 0, h, image, pbi, DIB_RGB_COLORS) )
{
wxLogLastError(wxT("GetDIBits"));
return 0;
}
}
// return the total size
return dwLen + bi.biSizeImage;
}
/* static */
HGLOBAL wxDIB::ConvertFromBitmap(HBITMAP hbmp)
{
// first calculate the size needed
const size_t size = ConvertFromBitmap(NULL, hbmp);
if ( !size )
{
// conversion to DDB failed?
return NULL;
}
HGLOBAL hDIB = ::GlobalAlloc(GMEM_MOVEABLE, size);
if ( !hDIB )
{
// this is an error which does risk to happen especially under Win9x
// and which the user may understand so let him know about it
wxLogError(_("Failed to allocated %luKb of memory for bitmap data."),
(unsigned long)(size / 1024));
return NULL;
}
if ( !ConvertFromBitmap((BITMAPINFO *)GlobalHandle(hDIB), hbmp) )
{
// this really shouldn't happen... it worked the first time, why not
// now?
wxFAIL_MSG( _T("wxDIB::ConvertFromBitmap() unexpectedly failed") );
return NULL;
}
return hDIB;
}
// ----------------------------------------------------------------------------
// palette support
// ----------------------------------------------------------------------------
@ -330,12 +435,12 @@ wxPalette *wxDIB::CreatePalette() const
if ( !biClrUsed )
{
// biClrUsed field might not be set
biClrUsed = 1 << ds.dsBmih.biBitCount;
biClrUsed = wxGetNumOfBitmapColors(ds.dsBmih.biBitCount);
}
if ( biClrUsed > 256 )
if ( !biClrUsed )
{
// only 8bpp bitmaps (and less) have palettes, so we surely don't
// bitmaps of this depth don't have palettes at all
//
// NB: another possibility would be to return
// GetStockObject(DEFAULT_PALETTE) or even CreateHalftonePalette()?
@ -440,646 +545,3 @@ bool wxDIB::Create(const wxImage& image)
#endif // wxUSE_IMAGE
// ============================================================================
// old DIB code, to be integrated in wxDIB class
// ============================================================================
/*
* Routines for dealing with Device Independent Bitmaps.
*
* wxReadDIB() - Reads a DIB
* wxWriteDIB() - Writes a global handle in CF_DIB format
* to a file.
* wxPaletteSize() - Calculates the palette size in bytes
* of given DIB
* wxDibNumColors() - Determines the number of colors in DIB
* wxDibFromBitmap() - Creates a DIB repr. the DDB passed in.
* lread() - Private routine to read more than 64k
* lwrite() - Private routine to write more than 64k
*/
#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 lread(int fh, VOID FAR *pv, DWORD ul);
static DWORD lwrite(int fh, VOID FAR *pv, DWORD ul);
static bool wxWriteDIB (LPTSTR szFile,HANDLE hdib);
WORD wxPaletteSize (VOID FAR * pv); // This is non-static as some apps use it externally
static WORD wxDibNumColors (VOID FAR * pv);
static bool wxMakeBitmapAndPalette(HDC,HANDLE,HPALETTE *,HBITMAP *);
/*
* FUNCTION : wxWriteDIB(LPSTR szFile,HANDLE hdib)
* PURPOSE : Write a global handle in CF_DIB format to a file.
* RETURNS : TRUE - if successful.
* FALSE - otherwise
*/
static bool wxWriteDIB(LPTSTR szFile, HANDLE hdib)
{
BITMAPFILEHEADER hdr;
LPBITMAPINFOHEADER lpbi;
int fh;
OFSTRUCT of;
if (!hdib)
return FALSE;
fh = OpenFile(wxConvertWX2MB(szFile), &of, OF_CREATE | OF_READWRITE);
if (fh == -1)
return FALSE;
lpbi = (LPBITMAPINFOHEADER) GlobalLock(hdib);
/* 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 = wxDibNumColors(lpbi);
if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
return (WORD)(NumColors * sizeof(RGBTRIPLE));
else
return (WORD)(NumColors * sizeof(RGBQUAD));
}
/*
* FUNCTION : wxDibNumColors(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 wxDibNumColors(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 : 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 lread(int fh, void far *pv, DWORD ul)
{
DWORD ulT = ul;
#if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
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, (WXUINT) ul) != (WXUINT) 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 lwrite(int fh, VOID FAR *pv, DWORD ul)
{
DWORD ulT = ul;
#if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
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, (WXUINT) ul) != (WXUINT) ul)
return 0;
return ulT;
}
/*
* FUNCTION : wxReadDIB(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;
WORD offBits;
HDC hDC;
bool bCoreHead = FALSE;
HANDLE hDIB = 0;
/* Open the file and get a handle to it's BITMAPINFO */
fh = OpenFile (wxConvertWX2MB(lpFileName), &of, OF_READ);
if (fh == -1) {
wxLogError(_("Can't open file '%s'"), lpFileName);
return (0);
}
hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) +
256 * sizeof(RGBQUAD)));
if (!hDIB)
return(0);
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
/* 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;
lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
/* 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 (!wxMakeBitmapAndPalette(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 : wxMakeBitmapAndPalette
* 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 wxMakeBitmapAndPalette(HDC hDC, HANDLE hDIB,
HPALETTE * phPal, HBITMAP * phBitmap)
{
LPBITMAPINFOHEADER lpInfo;
bool result = FALSE;
HBITMAP hBitmap;
HPALETTE hPalette, hOldPal;
LPSTR lpBits;
lpInfo = (LPBITMAPINFOHEADER) GlobalLock(hDIB);
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;
}
}
GlobalUnlock (hDIB); // glt
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)
{
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 = (LPLOGPALETTE)malloc(sizeof(LOGPALETTE) +
(WORD)lpInfo->biClrUsed * sizeof(PALETTEENTRY));
if (!npPal)
return NULL;
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; (DWORD)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);
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));
}
/*
*
* 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.
*
*/
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.
*
* 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.
*/
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;
lpbmInfoHdr = (LPBITMAPINFOHEADER) GlobalLock (hDIB);
*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 *palette)
{
HPALETTE hPalette = 0;
#if wxUSE_PALETTE
if (palette)
hPalette = (HPALETTE) palette->GetHPALETTE();
#endif // wxUSE_PALETTE
HANDLE dibHandle = wxBitmapToDIB((HBITMAP) bitmap->GetHBITMAP(), hPalette);
if (dibHandle)
{
bool success = (wxWriteDIB(filename, dibHandle) != 0);
GlobalFree(dibHandle);
return success;
}
else return FALSE;
}

17
src/msw/gdiimage.cpp
View File

@ -355,22 +355,13 @@ bool wxBMPFileHandler::LoadFile(wxBitmap *bitmap,
bool wxBMPFileHandler::SaveFile(wxBitmap *bitmap,
const wxString& name,
int WXUNUSED(type),
const wxPalette *pal)
const wxPalette * WXUNUSED(pal))
{
#if wxUSE_IMAGE_LOADING_IN_MSW
wxCHECK_MSG( bitmap, false, _T("NULL bitmap in SaveFile") );
#if wxUSE_PALETTE
wxPalette *actualPalette = (wxPalette *)pal;
if ( !actualPalette )
actualPalette = bitmap->GetPalette();
#else
wxPalette *actualPalette = NULL;
#endif // wxUSE_PALETTE
wxDIB dib(*bitmap);
return wxSaveBitmap(WXSTRINGCAST name, bitmap, actualPalette) != 0;
#else
return false;
#endif
return dib.Save(name);
}
// ----------------------------------------------------------------------------

24
src/msw/tbarmsw.cpp
View File

@ -1103,20 +1103,16 @@ WXHBITMAP wxToolBar::CreateMappedBitmap(WXHINSTANCE WXUNUSED(hInstance), void *i
WXHBITMAP wxToolBar::CreateMappedBitmap(WXHINSTANCE hInstance, WXHBITMAP hBitmap)
{
HANDLE hDIB = wxBitmapToDIB((HBITMAP) hBitmap, 0);
if (hDIB)
{
#ifdef __WINDOWS_386__
LPBITMAPINFOHEADER lpbmInfoHdr = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
#else
LPBITMAPINFOHEADER lpbmInfoHdr = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
#endif
HBITMAP newBitmap = (HBITMAP) CreateMappedBitmap((WXHINSTANCE) wxGetInstance(), lpbmInfoHdr);
GlobalUnlock(hDIB);
HANDLE hDIB = wxDIB::ConvertFromBitmap((HBITMAP) hBitmap);
if ( !hDIB )
return 0;
WXHBITMAP newBitmap = CreateMappedBitmap(hInstance, GlobalHandle(hDIB));
GlobalFree(hDIB);
return (WXHBITMAP) newBitmap;
}
return 0;
return newBitmap;
}
#endif
#endif // wxUSE_TOOLBAR