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a3bf7524f394af039efe196a186f7969cbabcc19
wxWidgets/src/msw/bitmap.cpp
Václav Slavík a3bf7524f3 removed WXWIN_COMPATIBILITY and WXWIN_COMPATIBILITY_2 
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22966 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2003-08-17 12:50:53 +00:00

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51 KiB
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////////////////////////////////////////////////////////////////////////////
// Name: bitmap.cpp
// Purpose: wxBitmap
// Author: Julian Smart
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id$
// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "bitmap.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include <stdio.h>
#include "wx/list.h"
#include "wx/utils.h"
#include "wx/app.h"
#include "wx/palette.h"
#include "wx/dcmemory.h"
#include "wx/bitmap.h"
#include "wx/icon.h"
#endif
#include "wx/msw/private.h"
#include "wx/log.h"
#if wxUSE_WXDIB
#include "wx/msw/dib.h"
#endif
#include "wx/image.h"
#include "wx/xpmdecod.h"
#ifdef wxHAVE_RAW_BITMAP
#include "wx/rawbmp.h"
#endif
// missing from mingw32 header
#ifndef CLR_INVALID
#define CLR_INVALID ((COLORREF)-1)
#endif // no CLR_INVALID
// ----------------------------------------------------------------------------
// Bitmap data
// ----------------------------------------------------------------------------
class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
{
public:
wxBitmapRefData();
virtual ~wxBitmapRefData() { Free(); }
virtual void Free();
// set the mask object to use as the mask, we take ownership of it
void SetMask(wxMask *mask)
{
delete m_bitmapMask;
m_bitmapMask = mask;
}
// set the HBITMAP to use as the mask
void SetMask(HBITMAP hbmpMask)
{
SetMask(new wxMask((WXHBITMAP)hbmpMask));
}
// return the mask
wxMask *GetMask() const { return m_bitmapMask; }
public:
#if wxUSE_PALETTE
wxPalette m_bitmapPalette;
#endif // wxUSE_PALETTE
// MSW-specific
// ------------
#ifdef __WXDEBUG__
// this field is solely for error checking: we detect selecting a bitmap
// into more than one DC at once or deleting a bitmap still selected into a
// DC (both are serious programming errors under Windows)
wxDC *m_selectedInto;
#endif // __WXDEBUG__
#if wxUSE_WXDIB
// when GetRawData() is called for a DDB we need to convert it to a DIB
// first to be able to provide direct access to it and we cache that DIB
// here and convert it back to DDB when UngetRawData() is called
wxDIB *m_dib;
#endif
// true if we have alpha transparency info and can be drawn using
// AlphaBlend()
bool m_hasAlpha;
// true if our HBITMAP is a DIB section, false if it is a DDB
bool m_isDIB;
private:
// optional mask for transparent drawing
wxMask *m_bitmapMask;
DECLARE_NO_COPY_CLASS(wxBitmapRefData)
};
// ----------------------------------------------------------------------------
// macros
// ----------------------------------------------------------------------------
IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)
IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// helper functions
// ----------------------------------------------------------------------------
// decide whether we should create a DIB or a DDB for the given parameters
static bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
{
#if wxUSE_WXDIB
// here is the logic:
//
// (a) if hdc is specified, the caller explicitly wants DDB
// (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp or
// less DIBs anyhow)
// (c) finally, create DIBs under Win9x even if the depth hasn't been
// explicitly specified but the current display depth is 24 or more
// and the image is "big", i.e. > 16Mb which is the theoretical limit
// for DDBs under Win9x
//
// consequences (all of which seem to make sense):
//
// (i) by default, DDBs are created (depth == -1 usually)
// (ii) DIBs can be created by explicitly specifying the depth
// (iii) using a DC always forces creating a DDB
return !hdc &&
(d >= 24 ||
(d == -1 &&
wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
#else
return FALSE;
#endif
}
// ----------------------------------------------------------------------------
// wxBitmapRefData
// ----------------------------------------------------------------------------
wxBitmapRefData::wxBitmapRefData()
{
#ifdef __WXDEBUG__
m_selectedInto = NULL;
#endif
m_bitmapMask = NULL;
m_hBitmap = (WXHBITMAP) NULL;
#if wxUSE_WXDIB
m_dib = NULL;
#endif
m_isDIB =
m_hasAlpha = FALSE;
}
void wxBitmapRefData::Free()
{
wxASSERT_MSG( !m_selectedInto,
wxT("deleting bitmap still selected into wxMemoryDC") );
#if wxUSE_WXDIB
wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
#endif
if ( m_hBitmap)
{
if ( !::DeleteObject((HBITMAP)m_hBitmap) )
{
wxLogLastError(wxT("DeleteObject(hbitmap)"));
}
}
delete m_bitmapMask;
m_bitmapMask = NULL;
}
// ----------------------------------------------------------------------------
// wxBitmap creation
// ----------------------------------------------------------------------------
// this function should be called from all wxBitmap ctors
void wxBitmap::Init()
{
// m_refData = NULL; done in the base class ctor
}
wxGDIImageRefData *wxBitmap::CreateData() const
{
return new wxBitmapRefData;
}
#ifdef __WIN32__
bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
{
#if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
// it may be either HICON or HCURSOR
HICON hicon = (HICON)icon.GetHandle();
ICONINFO iconInfo;
if ( !::GetIconInfo(hicon, &iconInfo) )
{
wxLogLastError(wxT("GetIconInfo"));
return FALSE;
}
wxBitmapRefData *refData = new wxBitmapRefData;
m_refData = refData;
int w = icon.GetWidth(),
h = icon.GetHeight();
refData->m_width = w;
refData->m_height = h;
refData->m_depth = wxDisplayDepth();
refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
// the mask returned by GetIconInfo() is inversed compared to the usual
// wxWin convention
refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
// delete the old one now as we don't need it any more
::DeleteObject(iconInfo.hbmMask);
return TRUE;
#else
return FALSE;
#endif
}
#endif // Win32
bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
{
UnRef();
if ( !cursor.Ok() )
return FALSE;
#ifdef __WIN16__
wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
return FALSE;
#else
return CopyFromIconOrCursor(cursor);
#endif // Win16
}
bool wxBitmap::CopyFromIcon(const wxIcon& icon)
{
UnRef();
if ( !icon.Ok() )
return FALSE;
// GetIconInfo() doesn't exist under Win16 and I don't know any other way
// to create a bitmap from icon there - but using this way we won't have
// the mask (FIXME)
#ifdef __WIN16__
int width = icon.GetWidth(),
height = icon.GetHeight();
// copy the icon to the bitmap
ScreenHDC hdcScreen;
HDC hdc = ::CreateCompatibleDC(hdcScreen);
HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
::SelectObject(hdc, hbmpOld);
::DeleteDC(hdc);
wxBitmapRefData *refData = new wxBitmapRefData;
m_refData = refData;
refData->m_width = width;
refData->m_height = height;
refData->m_depth = wxDisplayDepth();
refData->m_hBitmap = (WXHBITMAP)hbitmap;
return TRUE;
#else // Win32
return CopyFromIconOrCursor(icon);
#endif // Win16/Win32
}
#if wxUSE_WXDIB
bool wxBitmap::CopyFromDIB(const wxDIB& dib)
{
wxCHECK_MSG( dib.IsOk(), FALSE, _T("invalid DIB in CopyFromDIB") );
HBITMAP hbitmap = dib.CreateDDB();
if ( !hbitmap )
return FALSE;
UnRef();
wxBitmapRefData *refData = new wxBitmapRefData;
m_refData = refData;
refData->m_width = dib.GetWidth();
refData->m_height = dib.GetHeight();
refData->m_depth = dib.GetDepth();
refData->m_hBitmap = (WXHBITMAP)hbitmap;
#if wxUSE_PALETTE
wxPalette *palette = dib.CreatePalette();
if ( palette )
{
refData->m_bitmapPalette = *palette;
}
delete palette;
#endif // wxUSE_PALETTE
return TRUE;
}
#endif
wxBitmap::~wxBitmap()
{
}
wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
{
Init();
#ifndef __WXMICROWIN__
wxBitmapRefData *refData = new wxBitmapRefData;
m_refData = refData;
refData->m_width = width;
refData->m_height = height;
refData->m_depth = depth;
char *data;
if ( depth == 1 )
{
// we assume that it is in XBM format which is not quite the same as
// the format CreateBitmap() wants because the order of bytes in the
// line is inversed!
const size_t bytesPerLine = (width + 7) / 8;
const size_t padding = bytesPerLine % 2;
const size_t len = height * ( padding + bytesPerLine );
data = (char *)malloc(len);
const char *src = bits;
char *dst = data;
for ( int rows = 0; rows < height; rows++ )
{
for ( size_t cols = 0; cols < bytesPerLine; cols++ )
{
unsigned char val = *src++;
unsigned char reversed = 0;
for ( int bits = 0; bits < 8; bits++)
{
reversed <<= 1;
reversed |= (val & 0x01);
val >>= 1;
}
*dst++ = reversed;
}
if ( padding )
*dst++ = 0;
}
}
else
{
// bits should already be in Windows standard format
data = (char *)bits; // const_cast is harmless
}
HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
if ( !hbmp )
{
wxLogLastError(wxT("CreateBitmap"));
}
if ( data != bits )
{
free(data);
}
SetHBITMAP((WXHBITMAP)hbmp);
#endif
}
// Create from XPM data
bool wxBitmap::CreateFromXpm(const char **data)
{
#if wxUSE_IMAGE && wxUSE_XPM
Init();
wxCHECK_MSG( data != NULL, FALSE, wxT("invalid bitmap data") )
wxXPMDecoder decoder;
wxImage img = decoder.ReadData(data);
wxCHECK_MSG( img.Ok(), FALSE, wxT("invalid bitmap data") )
*this = wxBitmap(img);
return TRUE;
#else
return FALSE;
#endif
}
wxBitmap::wxBitmap(int w, int h, int d)
{
Init();
(void)Create(w, h, d);
}
wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
{
Init();
(void)Create(w, h, dc);
}
wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
{
Init();
(void)Create(data, type, width, height, depth);
}
wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
{
Init();
LoadFile(filename, (int)type);
}
bool wxBitmap::Create(int width, int height, int depth)
{
return DoCreate(width, height, depth, 0);
}
bool wxBitmap::Create(int width, int height, const wxDC& dc)
{
wxCHECK_MSG( dc.Ok(), FALSE, _T("invalid HDC in wxBitmap::Create()") );
return DoCreate(width, height, -1, dc.GetHDC());
}
bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
{
UnRef();
m_refData = new wxBitmapRefData;
GetBitmapData()->m_width = w;
GetBitmapData()->m_height = h;
HBITMAP hbmp;
#if wxUSE_WXDIB
if ( wxShouldCreateDIB(w, h, d, hdc) )
{
if ( d == -1 )
{
// create DIBs without alpha channel by default
d = 24;
}
wxDIB dib(w, h, d);
if ( !dib.IsOk() )
return FALSE;
// don't delete the DIB section in dib object dtor
hbmp = dib.Detach();
GetBitmapData()->m_isDIB = TRUE;
GetBitmapData()->m_depth = d;
}
else // create a DDB
#endif
{
if ( d == -1 )
d = wxDisplayDepth();
GetBitmapData()->m_depth = d;
#ifndef __WXMICROWIN__
if ( d > 0 )
{
hbmp = ::CreateBitmap(w, h, 1, d, NULL);
if ( !hbmp )
{
wxLogLastError(wxT("CreateBitmap"));
}
}
else
#endif // !__WXMICROWIN__
{
ScreenHDC dc;
hbmp = ::CreateCompatibleBitmap(dc, w, h);
if ( !hbmp )
{
wxLogLastError(wxT("CreateCompatibleBitmap"));
}
GetBitmapData()->m_depth = wxDisplayDepth();
}
}
SetHBITMAP((WXHBITMAP)hbmp);
return Ok();
}
#if wxUSE_IMAGE
// ----------------------------------------------------------------------------
// wxImage to/from conversions for Microwin
// ----------------------------------------------------------------------------
// Microwin versions are so different from normal ones that it really doesn't
// make sense to use #ifdefs inside the function bodies
#ifdef __WXMICROWIN__
bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)
{
// Set this to 1 to experiment with mask code,
// which currently doesn't work
#define USE_MASKS 0
m_refData = new wxBitmapRefData();
// Initial attempt at a simple-minded implementation.
// The bitmap will always be created at the screen depth,
// so the 'depth' argument is ignored.
HDC hScreenDC = ::GetDC(NULL);
int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
HBITMAP hMaskBitmap = NULL;
HBITMAP hOldMaskBitmap = NULL;
HDC hMaskDC = NULL;
unsigned char maskR = 0;
unsigned char maskG = 0;
unsigned char maskB = 0;
// printf("Created bitmap %d\n", (int) hBitmap);
if (hBitmap == NULL)
{
::ReleaseDC(NULL, hScreenDC);
return FALSE;
}
HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
::ReleaseDC(NULL, hScreenDC);
// created an mono-bitmap for the possible mask
bool hasMask = image.HasMask();
if ( hasMask )
{
#if USE_MASKS
// FIXME: we should be able to pass bpp = 1, but
// GdBlit can't handle a different depth
#if 0
hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
#else
hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
#endif
maskR = image.GetMaskRed();
maskG = image.GetMaskGreen();
maskB = image.GetMaskBlue();
if (!hMaskBitmap)
{
hasMask = FALSE;
}
else
{
hScreenDC = ::GetDC(NULL);
hMaskDC = ::CreateCompatibleDC(hScreenDC);
::ReleaseDC(NULL, hScreenDC);
hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
}
#else
hasMask = FALSE;
#endif
}
int i, j;
for (i = 0; i < image.GetWidth(); i++)
{
for (j = 0; j < image.GetHeight(); j++)
{
unsigned char red = image.GetRed(i, j);
unsigned char green = image.GetGreen(i, j);
unsigned char blue = image.GetBlue(i, j);
::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
if (hasMask)
{
// scan the bitmap for the transparent colour and set the corresponding
// pixels in the mask to BLACK and the rest to WHITE
if (maskR == red && maskG == green && maskB == blue)
::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
else
::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
}
}
}
::SelectObject(hMemDC, hOldBitmap);
::DeleteDC(hMemDC);
if (hasMask)
{
::SelectObject(hMaskDC, hOldMaskBitmap);
::DeleteDC(hMaskDC);
((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
}
SetWidth(image.GetWidth());
SetHeight(image.GetHeight());
SetDepth(screenDepth);
SetHBITMAP( (WXHBITMAP) hBitmap );
#if wxUSE_PALETTE
// Copy the palette from the source image
SetPalette(image.GetPalette());
#endif // wxUSE_PALETTE
return TRUE;
}
wxImage wxBitmap::ConvertToImage() const
{
// Initial attempt at a simple-minded implementation.
// The bitmap will always be created at the screen depth,
// so the 'depth' argument is ignored.
// TODO: transparency (create a mask image)
if (!Ok())
{
wxFAIL_MSG( wxT("bitmap is invalid") );
return wxNullImage;
}
wxImage image;
wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
// create an wxImage object
int width = GetWidth();
int height = GetHeight();
image.Create( width, height );
unsigned char *data = image.GetData();
if( !data )
{
wxFAIL_MSG( wxT("could not allocate data for image") );
return wxNullImage;
}
HDC hScreenDC = ::GetDC(NULL);
HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
::ReleaseDC(NULL, hScreenDC);
HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
int i, j;
for (i = 0; i < GetWidth(); i++)
{
for (j = 0; j < GetHeight(); j++)
{
COLORREF color = ::GetPixel(hMemDC, i, j);
unsigned char red = GetRValue(color);
unsigned char green = GetGValue(color);
unsigned char blue = GetBValue(color);
image.SetRGB(i, j, red, green, blue);
}
}
::SelectObject(hMemDC, hOldBitmap);
::DeleteDC(hMemDC);
#if wxUSE_PALETTE
// Copy the palette from the source image
if (GetPalette())
image.SetPalette(* GetPalette());
#endif // wxUSE_PALETTE
return image;
}
#endif // __WXMICROWIN__
// ----------------------------------------------------------------------------
// wxImage to/from conversions
// ----------------------------------------------------------------------------
bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
{
return CreateFromImage(image, depth, 0);
}
bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)
{
wxCHECK_MSG( dc.Ok(), FALSE,
_T("invalid HDC in wxBitmap::CreateFromImage()") );
return CreateFromImage(image, -1, dc.GetHDC());
}
bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc )
{
#if wxUSE_WXDIB
wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") );
UnRef();
// first convert the image to DIB
const int h = image.GetHeight();
const int w = image.GetWidth();
wxDIB dib(image);
if ( !dib.IsOk() )
return FALSE;
// store the bitmap parameters
wxBitmapRefData *refData = new wxBitmapRefData;
refData->m_width = w;
refData->m_height = h;
refData->m_hasAlpha = image.HasAlpha();
m_refData = refData;
// next either store DIB as is or create a DDB from it
HBITMAP hbitmap;
// are we going to use DIB?
//
// NB: DDBs don't support alpha so if we have alpha channel we must use DIB
if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )
{
// don't delete the DIB section in dib object dtor
hbitmap = dib.Detach();
refData->m_isDIB = TRUE;
refData->m_depth = dib.GetDepth();
}
else // we need to convert DIB to DDB
{
hbitmap = dib.CreateDDB((HDC)hdc);
refData->m_depth = depth == -1 ? wxDisplayDepth() : depth;
}
// validate this object
SetHBITMAP((WXHBITMAP)hbitmap);
// finally also set the mask if we have one
if ( image.HasMask() )
{
SetMask(new wxMask(*this, wxColour(image.GetMaskRed(),
image.GetMaskGreen(),
image.GetMaskBlue())));
}
return TRUE;
#else
// FIXME: wxWinCE doesn't support wxDIB yet
return FALSE;
#endif
}
wxImage wxBitmap::ConvertToImage() const
{
// FIXME: this is untested code for WinCE, and
// the mask is not yet handled.
// For tips, see:
// http://www.codeproject.com/bitmap/dibsection.asp?print=true
#ifdef __WXWINCE__
// the colour used as transparent one in wxImage and the one it is replaced
// with when it really occurs in the bitmap
static const int MASK_RED = 1;
static const int MASK_GREEN = 2;
static const int MASK_BLUE = 3;
static const int MASK_BLUE_REPLACEMENT = 2;
wxImage image;
wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
// create an wxImage object
int width = GetWidth();
int height = GetHeight();
image.Create( width, height );
unsigned char *data = image.GetData();
if( !data )
{
wxFAIL_MSG( wxT("could not allocate data for image") );
return wxNullImage;
}
// calc the number of bytes per scanline and padding in the DIB
int bytePerLine = width*3;
int sizeDWORD = sizeof( DWORD );
int lineBoundary = bytePerLine % sizeDWORD;
int padding = 0;
if( lineBoundary > 0 )
{
padding = sizeDWORD - lineBoundary;
bytePerLine += padding;
}
// create a DIB header
int headersize = sizeof(BITMAPINFOHEADER);
BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
if( !lpDIBh )
{
wxFAIL_MSG( wxT("could not allocate data for DIB header") );
free( data );
return wxNullImage;
}
// Fill in the DIB header
lpDIBh->bmiHeader.biSize = headersize;
lpDIBh->bmiHeader.biWidth = width;
lpDIBh->bmiHeader.biHeight = -height;
lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
lpDIBh->bmiHeader.biPlanes = 1;
lpDIBh->bmiHeader.biBitCount = 24;
lpDIBh->bmiHeader.biCompression = BI_RGB;
lpDIBh->bmiHeader.biClrUsed = 0;
// These seem not really needed for our purpose here.
lpDIBh->bmiHeader.biClrImportant = 0;
lpDIBh->bmiHeader.biXPelsPerMeter = 0;
lpDIBh->bmiHeader.biYPelsPerMeter = 0;
// memory for DIB data is allocated by CreateDIBSection
void *lpBits = NULL;
// copy data from the device-dependent bitmap to the DIB
HDC hdc = ::GetDC(NULL);
HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
HBITMAP hBitmapSection = ::CreateDIBSection( hdc, lpDIBh, DIB_RGB_COLORS, & lpBits, NULL, 0 );
if (!hBitmapSection)
{
wxFAIL_MSG( wxT("could not create a DIB section") );
return wxNullImage;
}
// Copy the image from the DDB to the DIBSection
// Need to copy the supplied bitmap onto the newly created DIBsection
HDC hMemDC = CreateCompatibleDC(hdc);
HDC hCopyDC = CreateCompatibleDC(hdc);
if (! hMemDC || ! hCopyDC)
{
wxFAIL_MSG( wxT("unable to create compatible DCs") );
return wxNullImage;
}
#if 0
if (m_hPal)
{
SelectPalette(hMemDC, m_hPal, FALSE); RealizePalette(hMemDC);
SelectPalette(hCopyDC, m_hPal, FALSE); RealizePalette(hCopyDC);
}
#endif
HBITMAP hOldMemBitmap = (HBITMAP) SelectObject(hMemDC, hBitmap);
HBITMAP hOldCopyBitmap = (HBITMAP) SelectObject(hCopyDC, hBitmapSection);
BitBlt(hCopyDC, 0, 0, GetWidth(), GetHeight(), hMemDC, 0, 0, SRCCOPY);
SelectObject(hMemDC, hOldMemBitmap);
SelectObject(hCopyDC, hOldCopyBitmap);
DeleteDC(hMemDC);
DeleteDC(hCopyDC);
#if 0
if (m_hPal)
{
HGDIOBJ hObj = ::GetStockObject(DEFAULT_PALETTE);
SelectObject(hMemDC, hObj);
SelectObject(hCopyDC, hObj);
}
#endif
ReleaseDC(NULL, hdc);
// copy DIB data into the wxImage object
int i, j;
unsigned char *ptdata = data;
unsigned char *ptbits = (unsigned char*) lpBits;
for( i=0; i<height; i++ )
{
for( j=0; j<width; j++ )
{
*(ptdata++) = *(ptbits+2);
*(ptdata++) = *(ptbits+1);
*(ptdata++) = *(ptbits );
ptbits += 3;
}
ptbits += padding;
}
// TODO
#if 0
// similarly, set data according to the possible mask bitmap
if( GetMask() && GetMask()->GetMaskBitmap() )
{
hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
// memory DC created, color set, data copied, and memory DC deleted
HDC memdc = ::CreateCompatibleDC( hdc );
::SetTextColor( memdc, RGB( 0, 0, 0 ) );
::SetBkColor( memdc, RGB( 255, 255, 255 ) );
::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
::DeleteDC( memdc );
ptdata = data;
ptbits = lpBits;
for( i=0; i<height; i++ )
{
for( j=0; j<width; j++ )
{
// is this pixel transparent?
if ( *ptbits != 0 )
{
if ( (ptdata[0] == MASK_RED) &&
(ptdata[1] == MASK_GREEN) &&
(ptdata[2] == MASK_BLUE) )
{
// we have to fudge the colour a bit to prevent this
// pixel from appearing transparent
ptdata[2] = MASK_BLUE_REPLACEMENT;
}
ptdata += 3;
}
else // masked pixel
{
*(ptdata++) = MASK_RED;
*(ptdata++) = MASK_GREEN;
*(ptdata++) = MASK_BLUE;
}
ptbits += 3;
}
ptbits += padding;
}
image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );
image.SetMask( TRUE );
}
else
#endif
{
image.SetMask( FALSE );
}
// free allocated resources
::ReleaseDC(NULL, hdc);
free(lpDIBh);
// Delete the DIB section
::DeleteObject(hBitmapSection);
return image;
#else
// the colour used as transparent one in wxImage and the one it is replaced
// with when it really occurs in the bitmap
static const int MASK_RED = 1;
static const int MASK_GREEN = 2;
static const int MASK_BLUE = 3;
static const int MASK_BLUE_REPLACEMENT = 2;
wxImage image;
wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
// create an wxImage object
int width = GetWidth();
int height = GetHeight();
image.Create( width, height );
unsigned char *data = image.GetData();
if( !data )
{
wxFAIL_MSG( wxT("could not allocate data for image") );
return wxNullImage;
}
// calc the number of bytes per scanline and padding in the DIB
int bytePerLine = width*3;
int sizeDWORD = sizeof( DWORD );
int lineBoundary = bytePerLine % sizeDWORD;
int padding = 0;
if( lineBoundary > 0 )
{
padding = sizeDWORD - lineBoundary;
bytePerLine += padding;
}
// create a DIB header
int headersize = sizeof(BITMAPINFOHEADER);
BITMAPINFO *lpDIBh = (BITMAPINFO *) malloc( headersize );
if( !lpDIBh )
{
wxFAIL_MSG( wxT("could not allocate data for DIB header") );
free( data );
return wxNullImage;
}
// Fill in the DIB header
lpDIBh->bmiHeader.biSize = headersize;
lpDIBh->bmiHeader.biWidth = width;
lpDIBh->bmiHeader.biHeight = -height;
lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
lpDIBh->bmiHeader.biPlanes = 1;
lpDIBh->bmiHeader.biBitCount = 24;
lpDIBh->bmiHeader.biCompression = BI_RGB;
lpDIBh->bmiHeader.biClrUsed = 0;
// These seem not really needed for our purpose here.
lpDIBh->bmiHeader.biClrImportant = 0;
lpDIBh->bmiHeader.biXPelsPerMeter = 0;
lpDIBh->bmiHeader.biYPelsPerMeter = 0;
// memory for DIB data
unsigned char *lpBits;
lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
if( !lpBits )
{
wxFAIL_MSG( wxT("could not allocate data for DIB") );
free( data );
free( lpDIBh );
return wxNullImage;
}
// copy data from the device-dependent bitmap to the DIB
HDC hdc = ::GetDC(NULL);
HBITMAP hbitmap;
hbitmap = (HBITMAP) GetHBITMAP();
::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
// copy DIB data into the wxImage object
int i, j;
unsigned char *ptdata = data;
unsigned char *ptbits = lpBits;
for( i=0; i<height; i++ )
{
for( j=0; j<width; j++ )
{
*(ptdata++) = *(ptbits+2);
*(ptdata++) = *(ptbits+1);
*(ptdata++) = *(ptbits );
ptbits += 3;
}
ptbits += padding;
}
// similarly, set data according to the possible mask bitmap
if( GetMask() && GetMask()->GetMaskBitmap() )
{
hbitmap = (HBITMAP) GetMask()->GetMaskBitmap();
// memory DC created, color set, data copied, and memory DC deleted
HDC memdc = ::CreateCompatibleDC( hdc );
::SetTextColor( memdc, RGB( 0, 0, 0 ) );
::SetBkColor( memdc, RGB( 255, 255, 255 ) );
::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
::DeleteDC( memdc );
ptdata = data;
ptbits = lpBits;
for( i=0; i<height; i++ )
{
for( j=0; j<width; j++ )
{
// is this pixel transparent?
if ( *ptbits != 0 )
{
if ( (ptdata[0] == MASK_RED) &&
(ptdata[1] == MASK_GREEN) &&
(ptdata[2] == MASK_BLUE) )
{
// we have to fudge the colour a bit to prevent this
// pixel from appearing transparent
ptdata[2] = MASK_BLUE_REPLACEMENT;
}
ptdata += 3;
}
else // masked pixel
{
*(ptdata++) = MASK_RED;
*(ptdata++) = MASK_GREEN;
*(ptdata++) = MASK_BLUE;
}
ptbits += 3;
}
ptbits += padding;
}
image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );
image.SetMask( TRUE );
}
else
{
image.SetMask( FALSE );
}
// free allocated resources
::ReleaseDC(NULL, hdc);
free(lpDIBh);
free(lpBits);
return image;
#endif
}
#endif // wxUSE_IMAGE
// ----------------------------------------------------------------------------
// loading and saving bitmaps
// ----------------------------------------------------------------------------
bool wxBitmap::LoadFile(const wxString& filename, long type)
{
UnRef();
wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
if ( handler )
{
m_refData = new wxBitmapRefData;
return handler->LoadFile(this, filename, type, -1, -1);
}
#if wxUSE_IMAGE
else
{
wxImage image;
if ( image.LoadFile( filename, type ) && image.Ok() )
{
*this = wxBitmap(image);
return TRUE;
}
}
#endif // wxUSE_IMAGE
return FALSE;
}
bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
{
UnRef();
wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
if ( !handler )
{
wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);
return FALSE;
}
m_refData = new wxBitmapRefData;
return handler->Create(this, data, type, width, height, depth);
}
bool wxBitmap::SaveFile(const wxString& filename,
int type,
const wxPalette *palette)
{
wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
if ( handler )
{
return handler->SaveFile(this, filename, type, palette);
}
#if wxUSE_IMAGE
else
{
// FIXME what about palette? shouldn't we use it?
wxImage image = ConvertToImage();
if ( image.Ok() )
{
return image.SaveFile(filename, type);
}
}
#endif // wxUSE_IMAGE
return FALSE;
}
// ----------------------------------------------------------------------------
// sub bitmap extraction
// ----------------------------------------------------------------------------
wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
{
wxCHECK_MSG( Ok() &&
(rect.x >= 0) && (rect.y >= 0) &&
(rect.x+rect.width <= GetWidth()) &&
(rect.y+rect.height <= GetHeight()),
wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
wxBitmap ret( rect.width, rect.height );
wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
#ifndef __WXMICROWIN__
// TODO: copy alpha channel data if any
// copy bitmap data
MemoryHDC dcSrc,
dcDst;
{
SelectInHDC selectSrc(dcSrc, GetHbitmap()),
selectDst(dcDst, GetHbitmapOf(ret));
if ( !selectSrc || !selectDst )
{
wxLogLastError(_T("SelectObjct(hBitmap)"));
}
if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
dcSrc, rect.x, rect.y, SRCCOPY) )
{
wxLogLastError(_T("BitBlt"));
}
}
// copy mask if there is one
if ( GetMask() )
{
HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
selectDst(dcDst, hbmpMask);
if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
dcSrc, rect.x, rect.y, SRCCOPY) )
{
wxLogLastError(_T("BitBlt"));
}
wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
ret.SetMask(mask);
}
#endif // !__WXMICROWIN__
return ret;
}
// ----------------------------------------------------------------------------
// wxBitmap accessors
// ----------------------------------------------------------------------------
#if wxUSE_PALETTE
wxPalette* wxBitmap::GetPalette() const
{
return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
: (wxPalette *) NULL;
}
#endif
wxMask *wxBitmap::GetMask() const
{
return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;
}
#ifdef __WXDEBUG__
wxDC *wxBitmap::GetSelectedInto() const
{
return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;
}
#endif
#if WXWIN_COMPATIBILITY_2_4
int wxBitmap::GetQuality() const
{
return 0;
}
#endif // WXWIN_COMPATIBILITY_2_4
void wxBitmap::UseAlpha()
{
if ( GetBitmapData() )
GetBitmapData()->m_hasAlpha = true;
}
bool wxBitmap::HasAlpha() const
{
return GetBitmapData() && GetBitmapData()->m_hasAlpha;
}
// ----------------------------------------------------------------------------
// wxBitmap setters
// ----------------------------------------------------------------------------
#ifdef __WXDEBUG__
void wxBitmap::SetSelectedInto(wxDC *dc)
{
if ( GetBitmapData() )
GetBitmapData()->m_selectedInto = dc;
}
#endif
#if wxUSE_PALETTE
void wxBitmap::SetPalette(const wxPalette& palette)
{
EnsureHasData();
GetBitmapData()->m_bitmapPalette = palette;
}
#endif // wxUSE_PALETTE
void wxBitmap::SetMask(wxMask *mask)
{
EnsureHasData();
GetBitmapData()->SetMask(mask);
}
#if WXWIN_COMPATIBILITY_2_4
void wxBitmap::SetQuality(int WXUNUSED(quality))
{
}
#endif // WXWIN_COMPATIBILITY_2_4
// ----------------------------------------------------------------------------
// raw bitmap access support
// ----------------------------------------------------------------------------
#ifdef wxHAVE_RAW_BITMAP
void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
{
#if wxUSE_WXDIB
if ( !Ok() )
{
// no bitmap, no data (raw or otherwise)
return NULL;
}
// if we're already a DIB we can access our data directly, but if not we
// need to convert this DDB to a DIB section and use it for raw access and
// then convert it back
HBITMAP hDIB;
if ( !GetBitmapData()->m_isDIB )
{
wxCHECK_MSG( !GetBitmapData()->m_dib, FALSE,
_T("GetRawData() may be called only once") );
wxDIB *dib = new wxDIB(*this);
if ( !dib->IsOk() )
{
delete dib;
return NULL;
}
// we'll free it in UngetRawData()
GetBitmapData()->m_dib = dib;
hDIB = dib->GetHandle();
}
else // we're a DIB
{
hDIB = GetHbitmap();
}
DIBSECTION ds;
if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )
{
wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
return NULL;
}
// check that the bitmap is in correct format
if ( ds.dsBm.bmBitsPixel != bpp )
{
wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );
return NULL;
}
// ok, store the relevant info in wxPixelDataBase
const LONG h = ds.dsBm.bmHeight;
data.m_width = ds.dsBm.bmWidth;
data.m_height = h;
// remember that DIBs are stored in top to bottom order!
const LONG bytesPerRow = ds.dsBm.bmWidthBytes;
data.m_stride = -bytesPerRow;
char *bits = (char *)ds.dsBm.bmBits;
if ( h > 1 )
{
bits += (h - 1)*bytesPerRow;
}
return bits;
#else
return NULL;
#endif
}
void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
{
#if wxUSE_WXDIB
if ( !Ok() )
return;
// the cast is ugly but we can't do without it and without making this
// function template (and hence inline) unfortunately
typedef wxPixelData<wxBitmap, wxAlphaPixelFormat> PixelData;
PixelData& data = (PixelData &)dataBase;
if ( !data )
{
// invalid data, don't crash -- but don't assert neither as we're
// called automatically from wxPixelDataBase dtor and so there is no
// way to prevent this from happening
return;
}
if ( GetBitmapData()->m_hasAlpha )
{
// AlphaBlend() wants to have premultiplied source alpha but
// wxRawBitmap API uses normal, not premultiplied, colours, so adjust
// them here now
PixelData::Iterator p(data);
const int w = data.GetWidth();
const int h = data.GetHeight();
for ( int y = 0; y < h; y++ )
{
PixelData::Iterator rowStart = p;
for ( int x = 0; x < w; x++ )
{
const unsigned alpha = p.Alpha();
p.Red() = (p.Red() * alpha + 127) / 255;
p.Blue() = (p.Blue() * alpha + 127) / 255;
p.Green() = (p.Green() * alpha + 127) / 255;
++p;
}
p = rowStart;
p.OffsetY(data, 1);
}
// if we're a DDB we need to convert DIB back to DDB now to make the
// changes made via raw bitmap access effective
if ( !GetBitmapData()->m_isDIB )
{
wxDIB *dib = GetBitmapData()->m_dib;
GetBitmapData()->m_dib = NULL;
// TODO: convert
delete dib;
}
}
#endif
}
#endif // #ifdef wxHAVE_RAW_BITMAP
// ----------------------------------------------------------------------------
// wxMask
// ----------------------------------------------------------------------------
wxMask::wxMask()
{
m_maskBitmap = 0;
}
// Construct a mask from a bitmap and a colour indicating
// the transparent area
wxMask::wxMask(const wxBitmap& bitmap, const wxColour& colour)
{
m_maskBitmap = 0;
Create(bitmap, colour);
}
// Construct a mask from a bitmap and a palette index indicating
// the transparent area
wxMask::wxMask(const wxBitmap& bitmap, int paletteIndex)
{
m_maskBitmap = 0;
Create(bitmap, paletteIndex);
}
// Construct a mask from a mono bitmap (copies the bitmap).
wxMask::wxMask(const wxBitmap& bitmap)
{
m_maskBitmap = 0;
Create(bitmap);
}
wxMask::~wxMask()
{
if ( m_maskBitmap )
::DeleteObject((HBITMAP) m_maskBitmap);
}
// Create a mask from a mono bitmap (copies the bitmap).
bool wxMask::Create(const wxBitmap& bitmap)
{
#ifndef __WXMICROWIN__
wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, FALSE,
_T("can't create mask from invalid or not monochrome bitmap") );
if ( m_maskBitmap )
{
::DeleteObject((HBITMAP) m_maskBitmap);
m_maskBitmap = 0;
}
m_maskBitmap = (WXHBITMAP) CreateBitmap(
bitmap.GetWidth(),
bitmap.GetHeight(),
1, 1, 0
);
HDC srcDC = CreateCompatibleDC(0);
SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
HDC destDC = CreateCompatibleDC(0);
SelectObject(destDC, (HBITMAP) m_maskBitmap);
BitBlt(destDC, 0, 0, bitmap.GetWidth(), bitmap.GetHeight(), srcDC, 0, 0, SRCCOPY);
SelectObject(srcDC, 0);
DeleteDC(srcDC);
SelectObject(destDC, 0);
DeleteDC(destDC);
return TRUE;
#else
return FALSE;
#endif
}
// Create a mask from a bitmap and a palette index indicating
// the transparent area
bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
{
if ( m_maskBitmap )
{
::DeleteObject((HBITMAP) m_maskBitmap);
m_maskBitmap = 0;
}
#if wxUSE_PALETTE
if (bitmap.Ok() && bitmap.GetPalette()->Ok())
{
unsigned char red, green, blue;
if (bitmap.GetPalette()->GetRGB(paletteIndex, &red, &green, &blue))
{
wxColour transparentColour(red, green, blue);
return Create(bitmap, transparentColour);
}
}
#endif // wxUSE_PALETTE
return FALSE;
}
// Create a mask from a bitmap and a colour indicating
// the transparent area
bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
{
#ifndef __WXMICROWIN__
wxCHECK_MSG( bitmap.Ok(), FALSE, _T("invalid bitmap in wxMask::Create") );
if ( m_maskBitmap )
{
::DeleteObject((HBITMAP) m_maskBitmap);
m_maskBitmap = 0;
}
int width = bitmap.GetWidth(),
height = bitmap.GetHeight();
// scan the bitmap for the transparent colour and set the corresponding
// pixels in the mask to BLACK and the rest to WHITE
COLORREF maskColour = wxColourToPalRGB(colour);
m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
HDC srcDC = ::CreateCompatibleDC(NULL);
HDC destDC = ::CreateCompatibleDC(NULL);
if ( !srcDC || !destDC )
{
wxLogLastError(wxT("CreateCompatibleDC"));
}
bool ok = TRUE;
// SelectObject() will fail
wxASSERT_MSG( !bitmap.GetSelectedInto(),
_T("bitmap can't be selected in another DC") );
HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
if ( !hbmpSrcOld )
{
wxLogLastError(wxT("SelectObject"));
ok = FALSE;
}
HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
if ( !hbmpDstOld )
{
wxLogLastError(wxT("SelectObject"));
ok = FALSE;
}
if ( ok )
{
// this will create a monochrome bitmap with 0 points for the pixels
// which have the same value as the background colour and 1 for the
// others
::SetBkColor(srcDC, maskColour);
::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
}
::SelectObject(srcDC, hbmpSrcOld);
::DeleteDC(srcDC);
::SelectObject(destDC, hbmpDstOld);
::DeleteDC(destDC);
return ok;
#else // __WXMICROWIN__
return FALSE;
#endif // __WXMICROWIN__/!__WXMICROWIN__
}
// ----------------------------------------------------------------------------
// wxBitmapHandler
// ----------------------------------------------------------------------------
bool wxBitmapHandler::Create(wxGDIImage *image,
void *data,
long flags,
int width, int height, int depth)
{
wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
return bitmap ? Create(bitmap, data, flags, width, height, depth) : FALSE;
}
bool wxBitmapHandler::Load(wxGDIImage *image,
const wxString& name,
long flags,
int width, int height)
{
wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
}
bool wxBitmapHandler::Save(wxGDIImage *image,
const wxString& name,
int type)
{
wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
return bitmap ? SaveFile(bitmap, name, type) : FALSE;
}
bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
void *WXUNUSED(data),
long WXUNUSED(type),
int WXUNUSED(width),
int WXUNUSED(height),
int WXUNUSED(depth))
{
return FALSE;
}
bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
const wxString& WXUNUSED(name),
long WXUNUSED(type),
int WXUNUSED(desiredWidth),
int WXUNUSED(desiredHeight))
{
return FALSE;
}
bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
const wxString& WXUNUSED(name),
int WXUNUSED(type),
const wxPalette *WXUNUSED(palette))
{
return FALSE;
}
// ----------------------------------------------------------------------------
// DIB functions
// ----------------------------------------------------------------------------
#ifndef __WXMICROWIN__
bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
{
unsigned long i, headerSize;
LPBITMAPINFO lpDIBheader = NULL;
LPPALETTEENTRY lpPe = NULL;
// Allocate space for a DIB header
headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
lpDIBheader = (BITMAPINFO *) malloc(headerSize);
lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
GetPaletteEntries(hPal, 0, 256, lpPe);
memset(lpDIBheader, 0x00, sizeof(BITMAPINFOHEADER));
// Fill in the static parts of the DIB header
lpDIBheader->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
lpDIBheader->bmiHeader.biWidth = xSize;
lpDIBheader->bmiHeader.biHeight = ySize;
lpDIBheader->bmiHeader.biPlanes = 1;
// this value must be 1, 4, 8 or 24 so PixelDepth can only be
lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
lpDIBheader->bmiHeader.biCompression = BI_RGB;
lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
lpDIBheader->bmiHeader.biClrUsed = 256;
// Initialize the DIB palette
for (i = 0; i < 256; i++) {
lpDIBheader->bmiColors[i].rgbReserved = lpPe[i].peFlags;
lpDIBheader->bmiColors[i].rgbRed = lpPe[i].peRed;
lpDIBheader->bmiColors[i].rgbGreen = lpPe[i].peGreen;
lpDIBheader->bmiColors[i].rgbBlue = lpPe[i].peBlue;
}
*lpDIBHeader = lpDIBheader;
return TRUE;
}
void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
{
free(lpDIBHeader);
}
#endif
// ----------------------------------------------------------------------------
// global helper functions implemented here
// ----------------------------------------------------------------------------
// helper of wxBitmapToHICON/HCURSOR
static
HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
bool iconWanted,
int hotSpotX,
int hotSpotY)
{
if ( !bmp.Ok() )
{
// we can't create an icon/cursor form nothing
return 0;
}
wxMask *mask = bmp.GetMask();
if ( !mask )
{
// we must have a mask for an icon, so even if it's probably incorrect,
// do create it (grey is the "standard" transparent colour)
mask = new wxMask(bmp, *wxLIGHT_GREY);
}
ICONINFO iconInfo;
wxZeroMemory(iconInfo);
iconInfo.fIcon = iconWanted; // do we want an icon or a cursor?
if ( !iconWanted )
{
iconInfo.xHotspot = hotSpotX;
iconInfo.yHotspot = hotSpotY;
}
iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
iconInfo.hbmColor = GetHbitmapOf(bmp);
// black out the transparent area to preserve background colour, because
// Windows blits the original bitmap using SRCINVERT (XOR) after applying
// the mask to the dest rect.
{
MemoryHDC dcSrc, dcDst;
SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
selectBitmap(dcDst, iconInfo.hbmColor);
if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
dcSrc, 0, 0, SRCAND) )
{
wxLogLastError(_T("BitBlt"));
}
}
HICON hicon = ::CreateIconIndirect(&iconInfo);
if ( !bmp.GetMask() )
{
// we created the mask, now delete it
delete mask;
}
// delete the inverted mask bitmap we created as well
::DeleteObject(iconInfo.hbmMask);
return hicon;
}
HICON wxBitmapToHICON(const wxBitmap& bmp)
{
return wxBitmapToIconOrCursor(bmp, TRUE, 0, 0);
}
HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
{
return (HCURSOR)wxBitmapToIconOrCursor(bmp, FALSE, hotSpotX, hotSpotY);
}
HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
{
#ifndef __WXMICROWIN__
wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
// get width/height from the bitmap if not given
if ( !w || !h )
{
BITMAP bm;
::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
w = bm.bmWidth;
h = bm.bmHeight;
}
HDC hdcSrc = ::CreateCompatibleDC(NULL);
HDC hdcDst = ::CreateCompatibleDC(NULL);
if ( !hdcSrc || !hdcDst )
{
wxLogLastError(wxT("CreateCompatibleDC"));
}
HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
if ( !hbmpInvMask )
{
wxLogLastError(wxT("CreateBitmap"));
}
::SelectObject(hdcSrc, hbmpMask);
::SelectObject(hdcDst, hbmpInvMask);
if ( !::BitBlt(hdcDst, 0, 0, w, h,
hdcSrc, 0, 0,
NOTSRCCOPY) )
{
wxLogLastError(wxT("BitBlt"));
}
::DeleteDC(hdcSrc);
::DeleteDC(hdcDst);
return hbmpInvMask;
#else
return 0;
#endif
}
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