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pcsx2/3rdparty/wxWidgets/src/msw/bitmap.cpp

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////////////////////////////////////////////////////////////////////////////
// Name: src/msw/bitmap.cpp
// Purpose: wxBitmap
// Author: Julian Smart
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id: bitmap.cpp 56488 2008-10-22 17:01:02Z RR $
// Copyright: (c) Julian Smart
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "wx/bitmap.h"
#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/icon.h"
#include "wx/log.h"
#include "wx/image.h"
#endif
#include "wx/msw/private.h"
#if wxUSE_WXDIB
#include "wx/msw/dib.h"
#endif
#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();
wxBitmapRefData(const wxBitmapRefData& data);
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;
// not implemented
wxBitmapRefData& operator=(const 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
//
// NB: we always use DIBs under Windows CE as this is much simpler (even if
// also less efficient...) and we obviously can't use them if there is no
// DIB support compiled in at all
#ifdef __WXWINCE__
static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
#define ALWAYS_USE_DIB
#elif !wxUSE_WXDIB
// no sense in defining wxShouldCreateDIB() as we can't compile code
// executed if it is true, so we have to use #if's anyhow
#define NEVER_USE_DIB
#else // wxUSE_WXDIB && !__WXWINCE__
static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
{
// 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));
}
#define SOMETIMES_USE_DIB
#endif // different DIB usage scenarious
// ----------------------------------------------------------------------------
// 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;
}
wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
: wxGDIImageRefData(data)
{
#ifdef __WXDEBUG__
m_selectedInto = NULL;
#endif
// (deep) copy the mask if present
m_bitmapMask = NULL;
if (data.m_bitmapMask)
m_bitmapMask = new wxMask(*data.m_bitmapMask);
// FIXME: we don't copy m_hBitmap currently but we should, see wxBitmap::
// CloneRefData()
wxASSERT_MSG( !data.m_isDIB,
_T("can't copy bitmap locked for raw access!") );
m_isDIB = false;
m_hasAlpha = data.m_hasAlpha;
}
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
// ----------------------------------------------------------------------------
wxGDIImageRefData *wxBitmap::CreateData() const
{
return new wxBitmapRefData;
}
wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const
{
const wxBitmapRefData *
data = wx_static_cast(const wxBitmapRefData *, dataOrig);
if ( !data )
return NULL;
// FIXME: this method is backwards, it should just create a new
// wxBitmapRefData using its copy ctor but instead it modifies this
// bitmap itself and then returns its m_refData -- which works, of
// course (except in !wxUSE_WXDIB), but is completely illogical
wxBitmap *self = wx_const_cast(wxBitmap *, this);
wxBitmapRefData *selfdata;
#if wxUSE_WXDIB
// copy the other bitmap
if ( data->m_hBitmap )
{
wxDIB dib((HBITMAP)(data->m_hBitmap));
self->CopyFromDIB(dib);
selfdata = wx_static_cast(wxBitmapRefData *, m_refData);
selfdata->m_hasAlpha = data->m_hasAlpha;
}
else
#endif // wxUSE_WXDIB
{
// copy the bitmap data
selfdata = new wxBitmapRefData(*data);
self->m_refData = selfdata;
}
// copy also the mask
wxMask * const maskSrc = data->GetMask();
if ( maskSrc )
{
selfdata->SetMask(new wxMask(*maskSrc));
}
return selfdata;
}
#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;
#if wxUSE_WXDIB
// If the icon is 32 bits per pixel then it may have alpha channel data,
// although there are some icons that are 32 bpp but have no alpha... So
// convert to a DIB and manually check the 4th byte for each pixel.
BITMAP bm;
if ( ::GetObject(iconInfo.hbmColor, sizeof(BITMAP), (LPVOID)&bm)
&& bm.bmBitsPixel == 32)
{
wxDIB dib(iconInfo.hbmColor);
if (dib.IsOk())
{
unsigned char* pixels = dib.GetData();
for (int idx=0; idx<w*h*4; idx+=4)
{
if (pixels[idx+3] != 0)
{
// If there is an alpha byte that is non-zero then set the
// alpha flag and bail out of the loop.
refData->m_hasAlpha = true;
break;
}
}
}
}
#endif
if ( !refData->m_hasAlpha )
{
// the mask returned by GetIconInfo() is inverted 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
wxUnusedVar(icon);
return false;
#endif
}
#endif // Win32
bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
{
UnRef();
if ( !cursor.Ok() )
return false;
return CopyFromIconOrCursor(cursor);
}
bool wxBitmap::CopyFromIcon(const wxIcon& icon)
{
UnRef();
if ( !icon.Ok() )
return false;
return CopyFromIconOrCursor(icon);
}
#ifndef NEVER_USE_DIB
bool wxBitmap::CopyFromDIB(const wxDIB& dib)
{
wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );
#ifdef SOMETIMES_USE_DIB
HBITMAP hbitmap = dib.CreateDDB();
if ( !hbitmap )
return false;
#else // ALWAYS_USE_DIB
HBITMAP hbitmap = ((wxDIB &)dib).Detach(); // const_cast
#endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB
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 // NEVER_USE_DIB
wxBitmap::~wxBitmap()
{
}
wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
{
#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 reversed!
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 |= (unsigned char)(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
}
wxBitmap::wxBitmap(int w, int h, int d)
{
(void)Create(w, h, d);
}
wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
{
(void)Create(w, h, dc);
}
wxBitmap::wxBitmap(const void* data, long type, int width, int height, int depth)
{
(void)Create(data, type, width, height, depth);
}
wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
{
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 wxDUMMY_INITIALIZE(0);
#ifndef NEVER_USE_DIB
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 // NEVER_USE_DIB
{
#ifndef ALWAYS_USE_DIB
#ifndef __WXMICROWIN__
if ( d > 0 )
{
hbmp = ::CreateBitmap(w, h, 1, d, NULL);
if ( !hbmp )
{
wxLogLastError(wxT("CreateBitmap"));
}
GetBitmapData()->m_depth = d;
}
else // d == 0, create bitmap compatible with the screen
#endif // !__WXMICROWIN__
{
ScreenHDC dc;
hbmp = ::CreateCompatibleBitmap(dc, w, h);
if ( !hbmp )
{
wxLogLastError(wxT("CreateCompatibleBitmap"));
}
GetBitmapData()->m_depth = wxDisplayDepth();
}
#endif // !ALWAYS_USE_DIB
}
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());
}
#if wxUSE_WXDIB
bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)
{
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;
const bool hasAlpha = image.HasAlpha();
if (depth == -1)
depth = dib.GetDepth();
// store the bitmap parameters
wxBitmapRefData * const refData = new wxBitmapRefData;
refData->m_width = w;
refData->m_height = h;
refData->m_hasAlpha = hasAlpha;
refData->m_depth = depth;
m_refData = refData;
// next either store DIB as is or create a DDB from it
HBITMAP hbitmap wxDUMMY_INITIALIZE(0);
// are we going to use DIB?
//
// NB: DDBs don't support alpha so if we have alpha channel we must use DIB
if ( hasAlpha || wxShouldCreateDIB(w, h, depth, hdc) )
{
// don't delete the DIB section in dib object dtor
hbitmap = dib.Detach();
refData->m_isDIB = true;
}
#ifndef ALWAYS_USE_DIB
else // we need to convert DIB to DDB
{
hbitmap = dib.CreateDDB((HDC)hdc);
}
#endif // !ALWAYS_USE_DIB
// validate this object
SetHBITMAP((WXHBITMAP)hbitmap);
// finally also set the mask if we have one
if ( image.HasMask() )
{
const size_t len = 2*((w+15)/16);
BYTE *src = image.GetData();
BYTE *data = new BYTE[h*len];
memset(data, 0, h*len);
BYTE r = image.GetMaskRed(),
g = image.GetMaskGreen(),
b = image.GetMaskBlue();
BYTE *dst = data;
for ( int y = 0; y < h; y++, dst += len )
{
BYTE *dstLine = dst;
BYTE mask = 0x80;
for ( int x = 0; x < w; x++, src += 3 )
{
if (src[0] != r || src[1] != g || src[2] != b)
*dstLine |= mask;
if ( (mask >>= 1) == 0 )
{
dstLine++;
mask = 0x80;
}
}
}
hbitmap = ::CreateBitmap(w, h, 1, 1, data);
if ( !hbitmap )
{
wxLogLastError(_T("CreateBitmap(mask)"));
}
else
{
SetMask(new wxMask((WXHBITMAP)hbitmap));
}
delete[] data;
}
return true;
}
wxImage wxBitmap::ConvertToImage() const
{
// convert DDB to DIB
wxDIB dib(*this);
if ( !dib.IsOk() )
{
return wxNullImage;
}
// and then DIB to our wxImage
wxImage image = dib.ConvertToImage();
if ( !image.Ok() )
{
return wxNullImage;
}
// now do the same for the mask, if we have any
HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
if ( hbmpMask )
{
wxDIB dibMask(hbmpMask);
if ( dibMask.IsOk() )
{
// TODO: use wxRawBitmap to iterate over DIB
// we hard code the mask colour for now but we could also make an
// effort (and waste time) to choose a colour not present in the
// image already to avoid having to fudge the pixels below --
// whether it's worth to do it is unclear however
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;
const int h = dibMask.GetHeight();
const int w = dibMask.GetWidth();
const int bpp = dibMask.GetDepth();
const int maskBytesPerPixel = bpp >> 3;
const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
unsigned char *data = image.GetData();
// remember that DIBs are stored in bottom to top order
unsigned char *
maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
{
// traverse one mask DIB line
unsigned char *mask = maskLineStart;
for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
{
// should this pixel be transparent?
if ( *mask )
{
// no, check that it isn't transparent by accident
if ( (data[0] == MASK_RED) &&
(data[1] == MASK_GREEN) &&
(data[2] == MASK_BLUE) )
{
// we have to fudge the colour a bit to prevent
// this pixel from appearing transparent
data[2] = MASK_BLUE_REPLACEMENT;
}
data += 3;
}
else // yes, transparent pixel
{
*data++ = MASK_RED;
*data++ = MASK_GREEN;
*data++ = MASK_BLUE;
}
}
}
image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
}
}
return image;
}
#else // !wxUSE_WXDIB
bool
wxBitmap::CreateFromImage(const wxImage& WXUNUSED(image),
int WXUNUSED(depth),
WXHDC WXUNUSED(hdc))
{
return false;
}
wxImage wxBitmap::ConvertToImage() const
{
return wxImage();
}
#endif // wxUSE_WXDIB/!wxUSE_WXDIB
#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 && wxUSE_WXDIB
else // no bitmap handler found
{
wxImage image;
if ( image.LoadFile( filename, type ) && image.Ok() )
{
*this = wxBitmap(image);
return true;
}
}
#endif // wxUSE_IMAGE
return false;
}
bool wxBitmap::Create(const 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 && wxUSE_WXDIB
else // no bitmap handler found
{
// 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
{
MemoryHDC dcSrc;
SelectInHDC selectSrc(dcSrc, GetHbitmap());
return GetSubBitmapOfHDC( rect, (WXHDC)dcSrc );
}
wxBitmap wxBitmap::GetSubBitmapOfHDC( const wxRect& rect, WXHDC hdc ) 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, GetDepth() );
wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
#ifndef __WXMICROWIN__
// handle alpha channel, if any
if (HasAlpha())
ret.UseAlpha();
// copy bitmap data
MemoryHDC dcSrc,
dcDst;
{
SelectInHDC selectDst(dcDst, GetHbitmapOf(ret));
if ( !selectDst )
{
wxLogLastError(_T("SelectObject(destBitmap)"));
}
if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
(HDC)hdc, 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;
}
wxBitmap wxBitmap::GetMaskBitmap() const
{
wxBitmap bmp;
wxMask *mask = GetMask();
if ( mask )
bmp.SetHBITMAP(mask->GetMaskBitmap());
return bmp;
}
#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)
{
AllocExclusive();
GetBitmapData()->m_bitmapPalette = palette;
}
#endif // wxUSE_PALETTE
void wxBitmap::SetMask(wxMask *mask)
{
AllocExclusive();
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, NULL,
_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!
// (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
// multiple of 2, as required by the documentation. So we use the official
// formula, which we already use elsewhere.)
const LONG bytesPerRow =
wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
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;
if ( !&dataBase )
{
// 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 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 // wxUSE_WXDIB
}
#endif // #ifdef wxHAVE_RAW_BITMAP
// ----------------------------------------------------------------------------
// wxMask
// ----------------------------------------------------------------------------
wxMask::wxMask()
{
m_maskBitmap = 0;
}
// Copy constructor
wxMask::wxMask(const wxMask &mask)
: wxObject()
{
BITMAP bmp;
HDC srcDC = CreateCompatibleDC(0);
HDC destDC = CreateCompatibleDC(0);
// GetBitmapDimensionEx won't work if SetBitmapDimensionEx wasn't used
// so we'll use GetObject() API here:
if (::GetObject((HGDIOBJ)mask.m_maskBitmap, sizeof(bmp), &bmp) == 0)
{
wxFAIL_MSG(wxT("Cannot retrieve the dimensions of the wxMask to copy"));
return;
}
// create our HBITMAP
int w = bmp.bmWidth, h = bmp.bmHeight;
m_maskBitmap = (WXHBITMAP)CreateCompatibleBitmap(srcDC, w, h);
// copy the mask's HBITMAP into our HBITMAP
SelectObject(srcDC, (HBITMAP) mask.m_maskBitmap);
SelectObject(destDC, (HBITMAP) m_maskBitmap);
BitBlt(destDC, 0, 0, w, h, srcDC, 0, 0, SRCCOPY);
SelectObject(srcDC, 0);
DeleteDC(srcDC);
SelectObject(destDC, 0);
DeleteDC(destDC);
}
// 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
wxUnusedVar(bitmap);
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__
wxUnusedVar(bitmap);
wxUnusedVar(colour);
return false;
#endif // __WXMICROWIN__/!__WXMICROWIN__
}
// ----------------------------------------------------------------------------
// wxBitmapHandler
// ----------------------------------------------------------------------------
bool wxBitmapHandler::Create(wxGDIImage *image,
const void* data,
long flags,
int width, int height, int depth)
{
wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
return bitmap && Create(bitmap, data, flags, width, height, depth);
}
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);
}
bool wxBitmapHandler::Save(wxGDIImage *image,
const wxString& name,
int type)
{
wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
return bitmap && SaveFile(bitmap, name, type);
}
bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
const 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;
// Allocate space for a DIB header
headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
LPPALETTEENTRY 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((int)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;
}
if ( bmp.HasAlpha() )
{
// Create an empty mask bitmap.
// it doesn't seem to work if we mess with the mask at all.
HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
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 = hMonoBitmap;
iconInfo.hbmColor = GetHbitmapOf(bmp);
HICON hicon = ::CreateIconIndirect(&iconInfo);
::DeleteObject(hMonoBitmap);
return hicon;
}
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() && !bmp.HasAlpha() )
{
// 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"));
}
HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
if ( !::BitBlt(hdcDst, 0, 0, w, h,
hdcSrc, 0, 0,
NOTSRCCOPY) )
{
wxLogLastError(wxT("BitBlt"));
}
// Deselect objects
SelectObject(hdcSrc,srcTmp);
SelectObject(hdcDst,dstTmp);
::DeleteDC(hdcSrc);
::DeleteDC(hdcDst);
return hbmpInvMask;
#else
return 0;
#endif
}
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