-/////////////////////////////////////////////////////////////////////////////
-// Name: dib.cpp
-// Purpose: Routines for dealing with Device Independent Bitmaps.
-// Author:
-// Modified by: Jason Quijano 06/06/2001
-// Created: 01/02/97
+///////////////////////////////////////////////////////////////////////////////
+// Name: src/msw/dib.cpp
+// Purpose: implements wxDIB class
+// Author: Vadim Zeitlin
+// Modified by:
+// Created: 03.03.03 (replaces the old file with the same name)
// RCS-ID: $Id$
-// Copyright: (c) Julian Smart
-/////////////////////////////////////////////////////////////////////////////
-// 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
-/////////////////////////////////////////////////////////////////////////////
+// Copyright: (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// 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.
+ */
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
-#if defined(__BORLANDC__)
-#pragma hdrstop
+#ifdef __BORLANDC__
+ #pragma hdrstop
#endif
+#if wxUSE_WXDIB
+
#ifndef WX_PRECOMP
-#include "wx/bitmap.h"
-#include "wx/log.h"
-#include "wx/intl.h"
-#endif
+ #include "wx/string.h"
+ #include "wx/log.h"
+ #include "wx/intl.h"
+ #include "wx/bitmap.h"
+ #include "wx/image.h"
+#endif //WX_PRECOMP
+
+#include "wx/file.h"
-#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
-#if !defined(__MWERKS__) && !defined(__SALFORDC__)
-#include <memory.h>
+#if !defined(__MWERKS__)
+ #include <memory.h>
#endif
#include "wx/msw/dib.h"
-#include "wx/filesys.h"
-
-#ifdef __GNUWIN32_OLD__
- #include "wx/msw/gnuwin32/extra.h"
-#endif
-#ifndef SEEK_CUR
-// flags for _lseek
-#define SEEK_CUR 1
-#define SEEK_END 2
-#define SEEK_SET 0
+#ifdef __WXWINCE__
+ #include <shellapi.h> // for SHLoadDIBitmap()
#endif
-// Number of bytes to be read during each read operation.
-#define MAXREAD 32768
+// ----------------------------------------------------------------------------
+// private functions
+// ----------------------------------------------------------------------------
-// Header signatutes for various resources
-#define BFT_ICON 0x4349 // 'IC'
-#define BFT_BITMAP 0x4d42 // 'BM'
-#define BFT_CURSOR 0x5450 // 'PT('
+// calculate the number of palette entries needed for the bitmap with this
+// number of bits per pixel
+static inline WORD GetNumberOfColours(WORD bitsPerPixel)
+{
+ // only 1, 4 and 8bpp bitmaps use palettes (well, they could be used with
+ // 24bpp ones too but we don't support this as I think it's quite uncommon)
+ return (WORD)(bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0);
+}
-// macro to determine if resource is a DIB
-#define ISDIB(bft) ((bft) == BFT_BITMAP)
+// wrapper around ::GetObject() for DIB sections
+static inline bool GetDIBSection(HBITMAP hbmp, DIBSECTION *ds)
+{
+ // note that at least under Win9x (this doesn't seem to happen under Win2K
+ // but this doesn't mean anything, of course), GetObject() may return
+ // sizeof(DIBSECTION) for a bitmap which is *not* a DIB section and the way
+ // to check for it is by looking at the bits pointer
+ return ::GetObject(hbmp, sizeof(DIBSECTION), ds) == sizeof(DIBSECTION) &&
+ ds->dsBm.bmBits;
+}
-// Macro to align given value to the closest DWORD (unsigned long )
-#define ALIGNULONG(i) ((i+3)/4*4)
+// ============================================================================
+// implementation
+// ============================================================================
-// Macro to determine to round off the given value to the closest byte
-#define WIDTHBYTES(i) ((i+31)/32*4)
+// ----------------------------------------------------------------------------
+// wxDIB creation
+// ----------------------------------------------------------------------------
-#define PALVERSION 0x300
-#define MAXPALETTE 256 // max. # supported palette entries
+bool wxDIB::Create(int width, int height, int depth)
+{
+ // we don't support formats using palettes right now so we only create
+ // either 24bpp (RGB) or 32bpp (RGBA) bitmaps
+ wxASSERT_MSG( depth, _T("invalid image depth in wxDIB::Create()") );
+ if ( depth < 24 )
+ depth = 24;
+
+ // allocate memory for bitmap structures
+ static const int sizeHeader = sizeof(BITMAPINFOHEADER);
+
+ BITMAPINFO *info = (BITMAPINFO *)malloc(sizeHeader);
+ wxCHECK_MSG( info, false, _T("malloc(BITMAPINFO) failed") );
+
+ memset(info, 0, sizeHeader);
+
+ info->bmiHeader.biSize = sizeHeader;
+ info->bmiHeader.biWidth = width;
+
+ // we use positive height here which corresponds to a DIB with normal, i.e.
+ // bottom to top, order -- normally using negative height (which means
+ // reversed for MS and hence natural for all the normal people top to
+ // bottom line scan order) could be used to avoid the need for the image
+ // reversal in Create(image) but this doesn't work under NT, only Win9x!
+ info->bmiHeader.biHeight = height;
+
+ info->bmiHeader.biPlanes = 1;
+ info->bmiHeader.biBitCount = (WORD)depth;
+ info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
+
+ m_handle = ::CreateDIBSection
+ (
+ 0, // hdc (unused with DIB_RGB_COLORS)
+ info, // bitmap description
+ DIB_RGB_COLORS, // use RGB, not palette
+ &m_data, // [out] DIB bits
+ NULL, // don't use file mapping
+ 0 // file mapping offset (not used here)
+ );
+
+ free(info);
+
+ if ( !m_handle )
+ {
+ wxLogLastError(wxT("CreateDIBSection"));
-static DWORD PASCAL lwrite(int fh, VOID FAR *pv, DWORD ul);
+ return false;
+ }
-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 *);
+ m_width = width;
+ m_height = height;
+ m_depth = depth;
-// ----------------------------------------------------------------------------
-// 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(wxConvertWX2MB(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;
+ 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 )
+bool wxDIB::Create(const wxBitmap& bmp)
{
- LPBITMAPINFOHEADER lpbi;
- WORD NumColors;
+ wxCHECK_MSG( bmp.Ok(), false, _T("wxDIB::Create(): invalid bitmap") );
- lpbi = (LPBITMAPINFOHEADER) pv;
- NumColors = DibNumColors(lpbi);
+ if ( !Create(GetHbitmapOf(bmp)) )
+ return false;
- if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
- return (WORD)(NumColors * sizeof(RGBTRIPLE));
- else
- return (WORD)(NumColors * sizeof(RGBQUAD));
-}
+ m_hasAlpha = bmp.HasAlpha();
-// ----------------------------------------------------------------------------
-// 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;
- }
+ return true;
}
-// ----------------------------------------------------------------------------
-// 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)
+bool wxDIB::Create(HBITMAP hbmp)
{
- 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);
+ // this bitmap could already be a DIB section in which case we don't need
+ // to convert it to DIB
+ DIBSECTION ds;
+ if ( GetDIBSection(hbmp, &ds) )
+ {
+ m_handle = hbmp;
- GetObject(hbm, sizeof (bm), (LPSTR) &bm);
+ // wxBitmap will free it, not we
+ m_ownsHandle = false;
- if (biBits == 0)
- biBits = bm.bmPlanes * bm.bmBitsPixel;
+ // copy all the bitmap parameters too as we have them now anyhow
+ m_width = ds.dsBm.bmWidth;
+ m_height = ds.dsBm.bmHeight;
+ m_depth = ds.dsBm.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;
+ m_data = ds.dsBm.bmBits;
+ }
+ else // no, it's a DDB -- convert it to DIB
+ {
+ // prepare all the info we need
+ BITMAP bm;
+ if ( !::GetObject(hbmp, sizeof(bm), &bm) )
+ {
+ wxLogLastError(wxT("GetObject(bitmap)"));
- dwLen = bi.biSize + wxPaletteSize(&bi);
+ return false;
+ }
- hdc = GetDC((HWND) NULL);
- hpal = SelectPalette(hdc, hpal, FALSE);
- RealizePalette(hdc);
+ int d = bm.bmBitsPixel;
+ if ( d <= 0 )
+ d = wxDisplayDepth();
- hdib = GlobalAlloc(GHND, dwLen);
+ if ( !Create(bm.bmWidth, bm.bmHeight, d) || !CopyFromDDB(hbmp) )
+ return false;
+ }
- if (!hdib) {
- SelectPalette(hdc, hpal, FALSE);
- ReleaseDC(NULL, hdc);
- return NULL;
- }
+ return true;
+}
-#ifdef __WINDOWS_386__
- lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
-#else
- lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
-#endif
+// Windows CE doesn't have GetDIBits() so use an alternative implementation
+// for it
+//
+// in fact I'm not sure if GetDIBits() is really much better than using
+// BitBlt() like this -- it should be faster but I didn't do any tests, if
+// anybody has time to do them and by chance finds that GetDIBits() is not
+// much faster than BitBlt(), we could always use the Win CE version here
+#ifdef __WXWINCE__
- *lpbi = bi;
+bool wxDIB::CopyFromDDB(HBITMAP hbmp)
+{
+ MemoryHDC hdcSrc;
+ if ( !hdcSrc )
+ return false;
+
+ SelectInHDC selectSrc(hdcSrc, hbmp);
+ if ( !selectSrc )
+ return false;
+
+ MemoryHDC hdcDst;
+ if ( !hdcDst )
+ return false;
+
+ SelectInHDC selectDst(hdcDst, m_handle);
+ if ( !selectDst )
+ return false;
+
+
+ if ( !::BitBlt(
+ hdcDst,
+ 0, 0, m_width, m_height,
+ hdcSrc,
+ 0, 0,
+ SRCCOPY
+ ) )
+ {
+ wxLogLastError(_T("BitBlt(DDB -> DIB)"));
- // 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);
+ return false;
+ }
- // 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;
- }
+ return true;
+}
- // 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;
- }
+#else // !__WXWINCE__
- // call GetDIBits with a NON-NULL lpBits param, and actualy get the
- // bits this time
+bool wxDIB::CopyFromDDB(HBITMAP hbmp)
+{
+ DIBSECTION ds;
+ if ( !GetDIBSection(m_handle, &ds) )
+ {
+ // we're sure that our handle is a DIB section, so this should work
+ wxFAIL_MSG( _T("GetObject(DIBSECTION) unexpectedly failed") );
-#ifdef __WINDOWS_386__
- lpbi = (BITMAPINFOHEADER FAR *) MK_FP32(GlobalLock(hdib));
-#else
- lpbi = (BITMAPINFOHEADER FAR *) GlobalLock(hdib);
-#endif
+ return false;
+ }
- 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;
- }
+ if ( !::GetDIBits
+ (
+ ScreenHDC(), // the DC to use
+ hbmp, // the source DDB
+ 0, // first scan line
+ m_height, // number of lines to copy
+ ds.dsBm.bmBits, // pointer to the buffer
+ (BITMAPINFO *)&ds.dsBmih, // bitmap header
+ DIB_RGB_COLORS // and not DIB_PAL_COLORS
+ ) )
+ {
+ wxLogLastError(wxT("GetDIBits()"));
- bi = *lpbi;
- GlobalUnlock(hdib);
- SelectPalette(hdc, hpal, FALSE);
- ReleaseDC(NULL, hdc);
- return hdib;
+ return false;
+ }
+
+ return true;
}
-#endif
+#endif // __WXWINCE__/!__WXWINCE__
-//************* PRIVATE ROUTINES TO WRITE MORE THAN 64K ******************
// ----------------------------------------------------------------------------
-// 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.
+// Loading/saving the DIBs
// ----------------------------------------------------------------------------
-static DWORD PASCAL lwrite(
- int fh,
- VOID FAR *pv,
- DWORD ul)
+
+bool wxDIB::Load(const wxString& filename)
{
- 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, (WXUINT) ul) != (WXUINT) ul)
- return 0;
- return ulT;
+#ifdef __WXWINCE__
+ m_handle = SHLoadDIBitmap(filename);
+#else // !__WXWINCE__
+ m_handle = (HBITMAP)::LoadImage
+ (
+ wxGetInstance(),
+ filename.fn_str(),
+ IMAGE_BITMAP,
+ 0, 0, // don't specify the size
+ LR_CREATEDIBSECTION | LR_LOADFROMFILE
+ );
+#endif // __WXWINCE__
+
+ if ( !m_handle )
+ {
+ wxLogLastError(_T("Loading DIB from file"));
+
+ return false;
+ }
+
+ return true;
}
-// ----------------------------------------------------------------------------
-// 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)
+bool wxDIB::Save(const wxString& filename)
{
- LPBITMAPINFOHEADER lpbi;
- BITMAPFILEHEADER bf;
- WORD nNumColors;
- BOOL result = FALSE;
- WORD offBits;
- HDC hDC;
- BOOL bCoreHead = FALSE;
- HANDLE hDIB = 0;
-
- // JQ: We want to use wxFileSystem here in stead of Openfile so
- // that we can use other FS types like a zip files.
- wxFileSystem fsys;
- wxFSFile *file = fsys.OpenFile(lpFileName);
- wxInputStream *dibs = file->GetStream();
- if (!dibs) {
- wxLogError(_("Can't open file '%s'"), lpFileName);
- return (0);
+ wxCHECK_MSG( m_handle, false, _T("wxDIB::Save(): invalid object") );
+
+#if wxUSE_FILE
+ wxFile file(filename, wxFile::write);
+ bool ok = file.IsOpened();
+ if ( ok )
+ {
+ DIBSECTION ds;
+ if ( !GetDIBSection(m_handle, &ds) )
+ {
+ wxLogLastError(_T("GetObject(hDIB)"));
}
+ else
+ {
+ BITMAPFILEHEADER bmpHdr;
+ wxZeroMemory(bmpHdr);
- hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)));
- if (!hDIB)
- return(0);
+ const size_t sizeHdr = ds.dsBmih.biSize;
+ const size_t sizeImage = ds.dsBmih.biSizeImage;
-#ifdef __WINDOWS_386__
- lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
-#else
- lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
-#endif
+ bmpHdr.bfType = 0x4d42; // 'BM' in little endian
+ bmpHdr.bfOffBits = sizeof(BITMAPFILEHEADER) + ds.dsBmih.biSize;
+ bmpHdr.bfSize = bmpHdr.bfOffBits + sizeImage;
- // JQ: read from the wxInputStream dibs instead of fh so
- // that we can use other FS types like zip files.
- dibs->Read((LPSTR)&bf,sizeof(bf));
- if (sizeof(bf) != dibs->LastRead())
- goto ErrExit;
-
- if (bf.bfType != 0x4d42) // 'BM'
- goto ErrExit;
-
- // JQ: read from the wxInputStream dibs instead of fh so
- // that we can use other FS types like zip files.
- dibs->Read((LPSTR)lpbi,sizeof(BITMAPCOREHEADER));
- if (sizeof(BITMAPCOREHEADER) != dibs->LastRead())
- 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;
+ // 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;
}
- else {
+ }
+#else // !wxUSE_FILE
+ bool ok = false;
+#endif // wxUSE_FILE/!wxUSE_FILE
- // JQ: Get to the start of the header and read INFOHEADER
- // using dibs wxInputStream
- dibs->SeekI(sizeof(BITMAPFILEHEADER),wxFromStart);
- if (dibs->LastError() != wxSTREAM_NO_ERROR)
- goto ErrExit;
+ if ( !ok )
+ {
+ wxLogError(_("Failed to save the bitmap image to file \"%s\"."),
+ filename.c_str());
+ }
- // JQ: read from the wxInputStream dibs instead of fh so
- // that we can use other FS types like zip files.
- // Can I do error checking with this?
- dibs->Read((LPSTR)lpbi,sizeof(BITMAPINFOHEADER));
- if (sizeof(BITMAPINFOHEADER) != dibs->LastRead())
- goto ErrExit;
+ return ok;
+}
- }
+// ----------------------------------------------------------------------------
+// wxDIB accessors
+// ----------------------------------------------------------------------------
- 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
+void wxDIB::DoGetObject() const
+{
+ // only do something if we have a valid DIB but we don't [yet] have valid
+ // data
+ if ( m_handle && !m_data )
+ {
+ // although all the info we need is in BITMAP and so we don't really
+ // need DIBSECTION we still ask for it as modifying the bit values only
+ // works for the real DIBs and not for the bitmaps and it's better to
+ // check for this now rather than trying to find out why it doesn't
+ // work later
+ DIBSECTION ds;
+ if ( !GetDIBSection(m_handle, &ds) )
+ {
+ wxLogLastError(_T("GetObject(hDIB)"));
+ return;
}
- // fill in some default values if they are zero
- if (lpbi->biClrUsed == 0)
- lpbi->biClrUsed = nNumColors;
+ wxDIB *self = wxConstCast(this, wxDIB);
- if (lpbi->biSizeImage == 0){
- lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) + 31) & ~31) >> 3)
- * lpbi->biHeight;
- }
+ self->m_width = ds.dsBm.bmWidth;
+ self->m_height = ds.dsBm.bmHeight;
+ self->m_depth = ds.dsBm.bmBitsPixel;
+ self->m_data = ds.dsBm.bmBits;
+ }
+}
- // get a proper-sized buffer for header, color table and bits
- GlobalUnlock(hDIB);
- hDIB = GlobalReAlloc(hDIB, lpbi->biSize + nNumColors * sizeof(RGBQUAD) +
- lpbi->biSizeImage, 0);
+// ----------------------------------------------------------------------------
+// DDB <-> DIB conversions
+// ----------------------------------------------------------------------------
- // can't resize buffer for loading
- if (!hDIB)
- goto ErrExit2;
+#ifndef __WXWINCE__
-#ifdef __WINDOWS_386__
- lpbi = (LPBITMAPINFOHEADER)MK_FP32(GlobalLock(hDIB));
-#else
- lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
-#endif
+HBITMAP wxDIB::CreateDDB(HDC hdc) const
+{
+ wxCHECK_MSG( m_handle, 0, _T("wxDIB::CreateDDB(): invalid object") );
- // read the color table
- if (!bCoreHead)
- dibs->Read((LPSTR)lpbi + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
- else {
- signed int i;
- RGBQUAD FAR *pQuad;
- RGBTRIPLE FAR *pTriple;
- dibs->Read((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;
- }
- }
+ DIBSECTION ds;
+ if ( !GetDIBSection(m_handle, &ds) )
+ {
+ wxLogLastError(_T("GetObject(hDIB)"));
- // offset to the bits from start of DIB header
- offBits = (WORD)(lpbi->biSize + nNumColors * sizeof(RGBQUAD));
+ return 0;
+ }
- if (bf.bfOffBits != 0L)
- dibs->SeekI(bf.bfOffBits, wxFromStart);
+ // how many colours are we going to have in the palette?
+ DWORD biClrUsed = ds.dsBmih.biClrUsed;
+ if ( !biClrUsed )
+ {
+ // biClrUsed field might not be set
+ biClrUsed = GetNumberOfColours(ds.dsBmih.biBitCount);
+ }
- dibs->Read((LPSTR)lpbi + offBits,lpbi->biSizeImage);
- if (lpbi->biSizeImage == dibs->LastRead())
+ if ( !biClrUsed )
{
- GlobalUnlock(hDIB);
- hDC = GetDC(NULL);
- if (!MakeBitmapAndPalette(hDC, hDIB, palette, bitmap))
- {
- ReleaseDC(NULL,hDC);
- goto ErrExit2;
- }
- else
- {
- ReleaseDC(NULL,hDC);
- GlobalFree(hDIB);
- result = TRUE;
- }
+ return ConvertToBitmap((BITMAPINFO *)&ds.dsBmih, hdc, ds.dsBm.bmBits);
}
else
{
-ErrExit:
- GlobalUnlock(hDIB);
-ErrExit2:
- GlobalFree(hDIB);
+ // fake a BITMAPINFO w/o bits, just the palette info
+ wxCharBuffer bmi(sizeof(BITMAPINFO) + (biClrUsed - 1)*sizeof(RGBQUAD));
+ BITMAPINFO *pBmi = (BITMAPINFO *)bmi.data();
+ MemoryHDC hDC;
+ // get the colour table
+ SelectInHDC sDC(hDC, m_handle);
+ ::GetDIBColorTable(hDC, 0, biClrUsed, pBmi->bmiColors);
+ memcpy(&pBmi->bmiHeader, &ds.dsBmih, ds.dsBmih.biSize);
+
+ return ConvertToBitmap(pBmi, hdc, ds.dsBm.bmBits);
}
- 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)
+/* static */
+HBITMAP wxDIB::ConvertToBitmap(const BITMAPINFO *pbmi, HDC hdc, void *bits)
{
- 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
+ wxCHECK_MSG( pbmi, 0, _T("invalid DIB in ConvertToBitmap") );
- hPalette = wxMakeDIBPalette(lpInfo);
- if ( hPalette )
- {
- // Need to realize palette for converting DIB to bitmap.
- hOldPal = SelectPalette(hDC, hPalette, TRUE);
- RealizePalette(hDC);
+ // here we get BITMAPINFO struct followed by the actual bitmap bits and
+ // BITMAPINFO starts with BITMAPINFOHEADER followed by colour info
+ const BITMAPINFOHEADER *pbmih = &pbmi->bmiHeader;
- 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
+ // get the pointer to the start of the real image data if we have a plain
+ // DIB and not a DIB section (in the latter case the pointer must be passed
+ // to us by the caller)
+ if ( !bits )
+ {
+ // we must skip over the colour table to get to the image data
+ //
+ // colour table either has the real colour data in which case its
+ // number of entries is given by biClrUsed or is used for masks to be
+ // used for extracting colour information from true colour bitmaps in
+ // which case it always have exactly 3 DWORDs
+ int numColors;
+ switch ( pbmih->biCompression )
{
- *phBitmap = hBitmap;
- *phPal = hPalette;
- result = TRUE;
+ case BI_BITFIELDS:
+ numColors = 3;
+ break;
+
+ case BI_RGB:
+ // biClrUsed has the number of colors but it may be not initialized at
+ // all
+ numColors = pbmih->biClrUsed;
+ if ( !numColors )
+ {
+ numColors = GetNumberOfColours(pbmih->biBitCount);
+ }
+ break;
+
+ default:
+ // no idea how it should be calculated for the other cases
+ numColors = 0;
}
+
+ bits = (char *)pbmih + sizeof(*pbmih) + numColors*sizeof(RGBQUAD);
+ }
+
+ HBITMAP hbmp = ::CreateDIBitmap
+ (
+ hdc ? hdc // create bitmap compatible
+ : (HDC) ScreenHDC(), // with this DC
+ pbmih, // used to get size &c
+ CBM_INIT, // initialize bitmap bits too
+ bits, // ... using this data
+ pbmi, // this is used for palette only
+ DIB_RGB_COLORS // direct or indexed palette?
+ );
+
+ if ( !hbmp )
+ {
+ wxLogLastError(wxT("CreateDIBitmap"));
}
- GlobalUnlock (hDIB); // glt
- return(result);
+ return hbmp;
}
-// ----------------------------------------------------------------------------
-// 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 )
+/* static */
+size_t wxDIB::ConvertFromBitmap(BITMAPINFO *pbi, HBITMAP hbmp)
{
-#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)
+ wxASSERT_MSG( hbmp, wxT("invalid bmp can't be converted to DIB") );
+
+ // prepare all the info we need
+ BITMAP bm;
+ if ( !::GetObject(hbmp, sizeof(bm), &bm) )
{
-/*
- 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; (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;
- }
+ wxLogLastError(wxT("GetObject(bitmap)"));
- hLogPal = CreatePalette((LPLOGPALETTE)npPal);
-// LocalFree((HANDLE)npPal);
- free(npPal);
- return(hLogPal);
+ return 0;
}
- // 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
-}
+ // we need a BITMAPINFO anyhow and if we're not given a pointer to it we
+ // use this one
+ BITMAPINFO bi2;
-// ----------------------------------------------------------------------------
-// FUNCTION :
-// PURPOSE :
-// RETURNS :
-// ----------------------------------------------------------------------------
-bool wxLoadIntoBitmap(
- wxChar *filename,
- wxBitmap *bitmap,
- wxPalette **pal)
-{
- HBITMAP hBitmap;
- HPALETTE hPalette;
+ const bool wantSizeOnly = pbi == NULL;
+ if ( wantSizeOnly )
+ pbi = &bi2;
+
+ // just for convenience
+ const int h = bm.bmHeight;
- bool success = (wxReadDIB(filename, &hBitmap, &hPalette) != 0);
- if (!success)
+ // init the header
+ BITMAPINFOHEADER& bi = pbi->bmiHeader;
+ wxZeroMemory(bi);
+ bi.biSize = sizeof(BITMAPINFOHEADER);
+ bi.biWidth = bm.bmWidth;
+ bi.biHeight = h;
+ bi.biPlanes = 1;
+ bi.biBitCount = bm.bmBitsPixel;
+
+ // memory we need for BITMAPINFO only
+ DWORD dwLen = bi.biSize + GetNumberOfColours(bm.bmBitsPixel) * sizeof(RGBQUAD);
+
+ // 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
+ ) )
{
- DeleteObject(hPalette);
- return FALSE;
+ wxLogLastError(wxT("GetDIBits()"));
+
+ return 0;
}
- if (hPalette)
+ // 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 )
{
- if (pal)
- {
- *pal = new wxPalette;
- (*pal)->SetHPALETTE((WXHPALETTE) hPalette);
- }
- else
- DeleteObject(hPalette);
+ // conversion to DDB failed?
+ return NULL;
}
- else if (pal)
- *pal = NULL;
- if (hBitmap)
+ HGLOBAL hDIB = ::GlobalAlloc(GMEM_MOVEABLE, size);
+ if ( !hDIB )
{
- 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);
-#if WXWIN_COMPATIBILITY_2
- bitmap->SetOk(TRUE);
-#endif // WXWIN_COMPATIBILITY_2
- return TRUE;
+ // 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;
}
- else return FALSE;
-}
-// ----------------------------------------------------------------------------
-// FUNCTION :
-// PURPOSE :
-// RETURNS :
-// ----------------------------------------------------------------------------
-wxBitmap *wxLoadBitmap(
- wxChar *filename,
- wxPalette **pal)
-{
- wxBitmap *bitmap = new wxBitmap;
- if (wxLoadIntoBitmap(filename, bitmap, pal))
- return bitmap;
- else
+ if ( !ConvertFromBitmap((BITMAPINFO *)(void *)GlobalPtrLock(hDIB), hbmp) )
{
- delete bitmap;
+ // this really shouldn't happen... it worked the first time, why not
+ // now?
+ wxFAIL_MSG( _T("wxDIB::ConvertFromBitmap() unexpectedly failed") );
+
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;
+ return hDIB;
}
+#endif // __WXWINCE__
+
// ----------------------------------------------------------------------------
-// FUNCTION :
-// PURPOSE :
-// RETURNS :
+// palette support
// ----------------------------------------------------------------------------
-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 wxUSE_PALETTE
- if (!GetObject (hBitmap, sizeof (Bitmap), (LPSTR) &Bitmap))
- return NULL;
-
- InitBitmapInfoHeader (&bmInfoHdr,
- Bitmap.bmWidth,
- Bitmap.bmHeight,
- Bitmap.bmPlanes * Bitmap.bmBitsPixel);
+wxPalette *wxDIB::CreatePalette() const
+{
+ // GetDIBColorTable not available in eVC3
+#if defined(_WIN32_WCE) && _WIN32_WCE < 400
+ return NULL;
+#else
+ wxCHECK_MSG( m_handle, NULL, _T("wxDIB::CreatePalette(): invalid object") );
+ DIBSECTION ds;
+ if ( !GetDIBSection(m_handle, &ds) )
+ {
+ wxLogLastError(_T("GetObject(hDIB)"));
- // Now allocate memory for the DIB. Then, set the BITMAPINFOHEADER
- // into this memory, and find out where the bitmap bits go.
+ return 0;
+ }
- hDIB = GlobalAlloc (GHND, sizeof (BITMAPINFOHEADER) +
- wxPaletteSize ((LPSTR) &bmInfoHdr) + bmInfoHdr.biSizeImage);
+ // how many colours are we going to have in the palette?
+ DWORD biClrUsed = ds.dsBmih.biClrUsed;
+ if ( !biClrUsed )
+ {
+ // biClrUsed field might not be set
+ biClrUsed = GetNumberOfColours(ds.dsBmih.biBitCount);
+ }
- if (!hDIB)
+ if ( !biClrUsed )
+ {
+ // bitmaps of this depth don't have palettes at all
+ //
+ // NB: another possibility would be to return
+ // GetStockObject(DEFAULT_PALETTE) or even CreateHalftonePalette()?
return NULL;
+ }
-#ifdef __WINDOWS_386__
- lpbmInfoHdr = (LPBITMAPINFOHEADER) MK_FP32(GlobalLock (hDIB));
-#else
- lpbmInfoHdr = (LPBITMAPINFOHEADER) GlobalLock (hDIB);
-#endif
+ MemoryHDC hDC;
- *lpbmInfoHdr = bmInfoHdr;
- lpBits = wxFindDIBBits ((LPSTR) lpbmInfoHdr);
+ // LOGPALETTE struct has only 1 element in palPalEntry array, we're
+ // going to have biClrUsed of them so add necessary space
+ LOGPALETTE *pPalette = (LOGPALETTE *)
+ malloc(sizeof(LOGPALETTE) + (biClrUsed - 1)*sizeof(PALETTEENTRY));
+ wxCHECK_MSG( pPalette, NULL, _T("out of memory") );
- // 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);
+ // initialize the palette header
+ pPalette->palVersion = 0x300; // magic number, not in docs but works
+ pPalette->palNumEntries = (WORD)biClrUsed;
- if (hPal)
+ // and the colour table
+ wxCharBuffer rgb(sizeof(RGBQUAD) * biClrUsed);
+ RGBQUAD *pRGB = (RGBQUAD*)rgb.data();
+ SelectInHDC selectHandle(hDC, m_handle);
+ ::GetDIBColorTable(hDC, 0, biClrUsed, pRGB);
+ for ( DWORD i = 0; i < biClrUsed; i++, pRGB++ )
{
- hOldPal = SelectPalette (hMemDC, hPal, FALSE);
- RealizePalette (hMemDC);
+ pPalette->palPalEntry[i].peRed = pRGB->rgbRed;
+ pPalette->palPalEntry[i].peGreen = pRGB->rgbGreen;
+ pPalette->palPalEntry[i].peBlue = pRGB->rgbBlue;
+ pPalette->palPalEntry[i].peFlags = 0;
}
- // 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))
+ HPALETTE hPalette = ::CreatePalette(pPalette);
+
+ free(pPalette);
+
+ if ( !hPalette )
{
- GlobalUnlock (hDIB);
- GlobalFree (hDIB);
- hDIB = NULL;
+ wxLogLastError(_T("CreatePalette"));
+
+ return NULL;
}
- else
- GlobalUnlock (hDIB);
- // Finally, clean up and return.
- if (hOldPal)
- SelectPalette (hMemDC, hOldPal, FALSE);
+ wxPalette *palette = new wxPalette;
+ palette->SetHPALETTE((WXHPALETTE)hPalette);
- ReleaseDC (NULL, hMemDC);
- return hDIB;
+ return palette;
+#endif
}
+#endif // wxUSE_PALETTE
+
// ----------------------------------------------------------------------------
-// FUNCTION :
-// PURPOSE :
-// RETURNS :
+// wxImage support
// ----------------------------------------------------------------------------
-bool wxSaveBitmap(
- wxChar *filename,
- wxBitmap *bitmap,
- wxPalette *colourmap)
+
+#if wxUSE_IMAGE
+
+bool wxDIB::Create(const wxImage& image)
{
- HPALETTE hPalette = 0;
- if (colourmap)
- hPalette = (HPALETTE) colourmap->GetHPALETTE();
+ wxCHECK_MSG( image.Ok(), false, _T("invalid wxImage in wxDIB ctor") );
+
+ const int h = image.GetHeight();
+ const int w = image.GetWidth();
+
+ // if we have alpha channel, we need to create a 32bpp RGBA DIB, otherwise
+ // a 24bpp RGB is sufficient
+ m_hasAlpha = image.HasAlpha();
+ const int bpp = m_hasAlpha ? 32 : 24;
+
+ if ( !Create(w, h, bpp) )
+ return false;
+
+ // DIBs are stored in bottom to top order (see also the comment above in
+ // Create()) so we need to copy bits line by line and starting from the end
+ const int srcBytesPerLine = w * 3;
+ const int dstBytesPerLine = GetLineSize(w, bpp);
+ const unsigned char *src = image.GetData() + ((h - 1) * srcBytesPerLine);
+ const unsigned char *alpha = m_hasAlpha ? image.GetAlpha() + (h - 1)*w
+ : NULL;
+ unsigned char *dstLineStart = (unsigned char *)m_data;
+ for ( int y = 0; y < h; y++ )
+ {
+ // copy one DIB line
+ unsigned char *dst = dstLineStart;
+ if ( alpha )
+ {
+ for ( int x = 0; x < w; x++ )
+ {
+ // RGB order is reversed, and we need to premultiply
+ // all channels by alpha value for use with ::AlphaBlend.
+ const unsigned char a = *alpha++;
+ *dst++ = (unsigned char)((src[2] * a + 127) / 255);
+ *dst++ = (unsigned char)((src[1] * a + 127) / 255);
+ *dst++ = (unsigned char)((src[0] * a + 127) / 255);
+ *dst++ = a;
+ src += 3;
+ }
+ }
+ else // no alpha channel
+ {
+ for ( int x = 0; x < w; x++ )
+ {
+ // RGB order is reversed.
+ *dst++ = src[2];
+ *dst++ = src[1];
+ *dst++ = src[0];
+ src += 3;
+ }
+ }
+
+ // pass to the previous line in the image
+ src -= 2*srcBytesPerLine;
+ if ( alpha )
+ alpha -= 2*w;
+
+ // and to the next one in the DIB
+ dstLineStart += dstBytesPerLine;
+ }
+
+ return true;
+}
- HANDLE dibHandle = wxBitmapToDIB((HBITMAP) bitmap->GetHBITMAP(), hPalette);
- if (dibHandle)
+wxImage wxDIB::ConvertToImage() const
+{
+ wxCHECK_MSG( IsOk(), wxNullImage,
+ wxT("can't convert invalid DIB to wxImage") );
+
+ // create the wxImage object
+ const int w = GetWidth();
+ const int h = GetHeight();
+ wxImage image(w, h, false /* don't bother clearing memory */);
+ if ( !image.Ok() )
+ {
+ wxFAIL_MSG( wxT("could not allocate data for image") );
+ return wxNullImage;
+ }
+
+ if ( m_hasAlpha )
+ {
+ image.SetAlpha();
+ }
+
+ // this is the same loop as in Create() just above but with copy direction
+ // reversed
+ const int bpp = GetDepth();
+ const int dstBytesPerLine = w * 3;
+ const int srcBytesPerLine = GetLineSize(w, bpp);
+ unsigned char *dst = image.GetData() + ((h - 1) * dstBytesPerLine);
+ unsigned char *alpha = image.HasAlpha() ? image.GetAlpha() + (h - 1)*w
+ : NULL;
+ const bool is32bit = bpp == 32;
+ const unsigned char *srcLineStart = (unsigned char *)GetData();
+ for ( int y = 0; y < h; y++ )
{
- bool success = (WriteDIB(filename, dibHandle) != 0);
- GlobalFree(dibHandle);
- return success;
+ // copy one DIB line
+ const unsigned char *src = srcLineStart;
+ for ( int x = 0; x < w; x++ )
+ {
+ dst[2] = *src++;
+ dst[1] = *src++;
+ dst[0] = *src++;
+
+ if ( is32bit )
+ {
+ if ( alpha )
+ {
+ // wxImage uses non premultiplied alpha so undo
+ // premultiplication done in Create() above
+ const unsigned char a = *src;
+ *alpha++ = a;
+ if ( a > 0 )
+ {
+ dst[0] = (dst[0] * 255) / a;
+ dst[1] = (dst[1] * 255) / a;
+ dst[2] = (dst[2] * 255) / a;
+ }
+ }
+
+ src++;
+ }
+
+ dst += 3;
+ }
+
+ // pass to the previous line in the image
+ dst -= 2*dstBytesPerLine;
+ if ( alpha )
+ alpha -= 2*w;
+
+ // and to the next one in the DIB
+ srcLineStart += srcBytesPerLine;
}
- else return FALSE;
+
+ return image;
}
+#endif // wxUSE_IMAGE
+#endif // wxUSE_WXDIB
projects / wxWidgets.git / blobdiff