//////////////////////////////////////////////////////////////////////////// // Name: src/msw/bitmap.cpp // Purpose: wxBitmap // Author: Julian Smart // Modified by: // Created: 04/01/98 // 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 #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/scopedptr.h" #include "wx/msw/private.h" #include "wx/msw/dc.h" #if wxUSE_WXDIB #include "wx/msw/dib.h" #endif #ifdef wxHAS_RAW_BITMAP #include "wx/rawbmp.h" #endif // missing from mingw32 header #ifndef CLR_INVALID #define CLR_INVALID ((COLORREF)-1) #endif // no CLR_INVALID // ROP which doesn't have standard name #define DSTERASE 0x00220326 // dest = (NOT src) AND dest // ---------------------------------------------------------------------------- // wxBitmapRefData // ---------------------------------------------------------------------------- class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData { public: wxBitmapRefData() { Init(); } wxBitmapRefData(const wxBitmapRefData& data); virtual ~wxBitmapRefData() { Free(); } virtual void Free() wxOVERRIDE; #if wxUSE_WXDIB // Creates a new bitmap (DDB or DIB) from the contents of the given DIB. void CopyFromDIB(const wxDIB& dib); // Takes ownership of the given DIB. bool AssignDIB(wxDIB& dib); // Also takes ownership of the given DIB, but doesn't change any other // fields (which are supposed to be already set), and just updates // m_hasAlpha because 32 bit DIBs always do have it. void Set32bppHDIB(HBITMAP hdib); #endif // wxUSE_WXDIB // 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 // ------------ #if wxDEBUG_LEVEL // 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_LEVEL #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: void Init(); #if wxUSE_WXDIB // Initialize using the given DIB but use (and take ownership of) the // bitmap handle if it is valid, assuming it's a DDB. If it's not valid, // use the DIB handle itself taking ownership of it (i.e. wxDIB will become // invalid when this function returns even though we take it as const // reference because this is how it's passed to us). void InitFromDIB(const wxDIB& dib, HBITMAP hbitmap = NULL); #endif // wxUSE_WXDIB // optional mask for transparent drawing wxMask *m_bitmapMask; // not implemented wxBitmapRefData& operator=(const wxBitmapRefData&); }; // ---------------------------------------------------------------------------- // macros // ---------------------------------------------------------------------------- wxIMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject); wxIMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject); wxIMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject); // ============================================================================ // implementation // ============================================================================ // ---------------------------------------------------------------------------- // helper functions // ---------------------------------------------------------------------------- // decide whether we should create a DIB or a DDB for the given parameters #if wxUSE_WXDIB 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 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 // // 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 #else // !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 #endif // different DIB usage scenarious // ---------------------------------------------------------------------------- // wxBitmapRefData // ---------------------------------------------------------------------------- void wxBitmapRefData::Init() { #if wxDEBUG_LEVEL 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) { Init(); #if wxUSE_WXDIB wxASSERT_MSG( !data.m_dib, wxT("can't copy bitmap locked for raw access!") ); #endif // wxUSE_WXDIB m_hasAlpha = data.m_hasAlpha; #if wxUSE_WXDIB // copy the other bitmap if ( data.m_hBitmap ) { wxDIB dib((HBITMAP)(data.m_hBitmap)); // DDB obtained from CopyFromDIB() can have different // colour depth than source DIB so we need to check it. CopyFromDIB(dib); if ( m_depth != dib.GetDepth() ) { // We got DDB with a different colour depth than we wanted, so we // can't use it and need to continue using the DIB instead. wxDIB dibDst(m_width, m_height, dib.GetDepth()); if ( dibDst.IsOk() ) { m_depth = dib.GetDepth(); memcpy(dibDst.GetData(), dib.GetData(), wxDIB::GetLineSize(m_width, m_depth)*m_height); AssignDIB(dibDst); } else { // Nothing else left to do... } } } #endif // wxUSE_WXDIB // Ensure this is done after the block above otherwise if the color depth didn't match we'll lose the mask // (deep) copy the mask if present if (data.m_bitmapMask) m_bitmapMask = new wxMask(*data.m_bitmapMask); } void wxBitmapRefData::Free() { wxASSERT_MSG( !m_selectedInto, wxT("deleting bitmap still selected into wxMemoryDC") ); #if wxUSE_WXDIB wxASSERT_MSG( !m_dib, wxT("forgot to call wxBitmap::UngetRawData()!") ); #endif if ( m_hBitmap) { if ( !::DeleteObject((HBITMAP)m_hBitmap) ) { wxLogLastError(wxT("DeleteObject(hbitmap)")); } m_hBitmap = 0; } wxDELETE(m_bitmapMask); } #if wxUSE_WXDIB void wxBitmapRefData::InitFromDIB(const wxDIB& dib, HBITMAP hbitmap) { m_width = dib.GetWidth(); m_height = dib.GetHeight(); m_depth = dib.GetDepth(); #if wxUSE_PALETTE wxPalette *palette = dib.CreatePalette(); if ( palette ) m_bitmapPalette = *palette; delete palette; #endif // wxUSE_PALETTE if ( hbitmap ) { // We assume it's a DDB, otherwise there would be no point in passing // it to us in addition to the DIB. m_isDIB = false; } else // No valid DDB provided { // Just use DIB itself. m_isDIB = true; // Notice that we must not try to use the DIB after calling Detach() on // it, e.g. this must be done after calling CreatePalette() above. hbitmap = const_cast(dib).Detach(); } // In any case, take ownership of this bitmap. m_hBitmap = (WXHBITMAP)hbitmap; } void wxBitmapRefData::CopyFromDIB(const wxDIB& dib) { wxCHECK_RET( !IsOk(), "bitmap already initialized" ); wxCHECK_RET( dib.IsOk(), wxT("invalid DIB in CopyFromDIB") ); HBITMAP hbitmap; #ifdef SOMETIMES_USE_DIB hbitmap = dib.CreateDDB(); #else // ALWAYS_USE_DIB hbitmap = NULL; #endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB InitFromDIB(dib, hbitmap); if ( hbitmap ) { // DDB obtained from CreatedDDB() can have different colour depth // than source DIB and we have to adjust respective data member // accordingly. BITMAP bm; if ( ::GetObject(hbitmap, sizeof(bm), &bm) != sizeof(bm) ) { wxLogLastError(wxS("GetObject (@wxBitmapRefData::CopyFromDIB)")); } else { m_depth = bm.bmBitsPixel; } } } bool wxBitmapRefData::AssignDIB(wxDIB& dib) { if ( !dib.IsOk() ) return false; Free(); InitFromDIB(dib); return true; } void wxBitmapRefData::Set32bppHDIB(HBITMAP hdib) { Free(); m_isDIB = true; m_hasAlpha = true; m_hBitmap = hdib; } #endif // wxUSE_WXDIB // ---------------------------------------------------------------------------- // wxBitmap creation // ---------------------------------------------------------------------------- wxGDIImageRefData *wxBitmap::CreateData() const { return new wxBitmapRefData; } wxGDIRefData *wxBitmap::CloneGDIRefData(const wxGDIRefData *data) const { return new wxBitmapRefData(*static_cast(data)); } #if wxUSE_WXDIB // Premultiply the values of all RGBA pixels in the given range. static void PremultiplyPixels(unsigned char* begin, unsigned char* end) { for ( unsigned char* pixels = begin; pixels < end; pixels += 4 ) { const unsigned char a = pixels[3]; pixels[0] = ((pixels[0]*a) + 127)/255; pixels[1] = ((pixels[1]*a) + 127)/255; pixels[2] = ((pixels[2]*a) + 127)/255; } } // Helper which examines the alpha channel for any non-0 values and also // possibly returns the DIB with premultiplied values if it does have alpha // (i.e. this DIB is only filled if the function returns true). // // The function semantics is complicated but necessary to avoid converting to // DIB twice, which is expensive for large bitmaps, yet avoid code duplication // between CopyFromIconOrCursor() and MSWUpdateAlpha(). static bool CheckAlpha(HBITMAP hbmp, HBITMAP* hdib = NULL) { BITMAP bm; if ( !::GetObject(hbmp, sizeof(bm), &bm) || (bm.bmBitsPixel != 32) ) return false; wxDIB dib(hbmp); if ( !dib.IsOk() ) return false; unsigned char* pixels = dib.GetData(); unsigned char* const end = pixels + 4*dib.GetWidth()*dib.GetHeight(); for ( ; pixels < end; pixels += 4 ) { if ( pixels[3] != 0 ) { if ( hdib ) { // If we do have alpha, ensure we use premultiplied data for // our pixels as this is what the bitmaps created in other ways // do and this is necessary for e.g. AlphaBlend() to work with // this bitmap. PremultiplyPixels(dib.GetData(), end); *hdib = dib.Detach(); } return true; } } return false; } // Return HDIB containing premultiplied bitmap data if the original bitmap is // not premultiplied, otherwise return NULL. // // Semantics is a bit weird here again because we want to avoid throwing the // wxDIB we create here away if possible. // // Also notice that this function uses a heuristics for determining whether the // original bitmap uses premultiplied alpha or not and can return NULL for some // bitmaps not using premultiplied alpha. And while this should be relatively // rare in practice, we really ought to allow the user to specify this // explicitly. static HBITMAP CreatePremultipliedDIBIfNeeded(HBITMAP hbmp) { // Check if 32-bit bitmap realy has premultiplied RGB data // and premuliply it if necessary. BITMAP bm; if ( !::GetObject(hbmp, sizeof(bm), &bm) || (bm.bmBitsPixel != 32) ) return NULL; wxDIB dib(hbmp); if ( !dib.IsOk() ) return NULL; unsigned char* pixels = dib.GetData(); unsigned char* const end = pixels + 4*dib.GetWidth()*dib.GetHeight(); for ( ; pixels < end; pixels += 4 ) { const unsigned char a = pixels[3]; if ( a > 0 && (pixels[0] > a || pixels[1] > a || pixels[2] > a) ) { // Data is certainly not premultiplied by alpha if any of the // values is smaller than the value of alpha itself. PremultiplyPixels(dib.GetData(), end); return dib.Detach(); } } return NULL; } #endif // wxUSE_WXDIB bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon, wxBitmapTransparency transp) { // it may be either HICON or HCURSOR HICON hicon = (HICON)icon.GetHandle(); AutoIconInfo iconInfo; if ( !iconInfo.GetFrom(hicon) ) return false; wxBitmapRefData *refData = new wxBitmapRefData; m_refData = refData; int w = icon.GetWidth(), h = icon.GetHeight(); if ( iconInfo.hbmColor ) { refData->m_width = w; refData->m_height = h; refData->m_depth = wxDisplayDepth(); refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor; // Reset this field to prevent it from being destroyed by AutoIconInfo, // we took ownership of it. iconInfo.hbmColor = 0; } else // we only have monochrome icon/cursor { // For monochrome icons/cursor bitmap mask is of height 2*h // and contains both AND and XOR masks. // AND mask: 0 <= y <= h-1 // XOR mask: h <= y <= 2*h-1 // First we need to extract and store XOR mask from this bitmap. HBITMAP hbmp = ::CreateBitmap(w, h, 1, wxDisplayDepth(), NULL); if ( !hbmp ) { wxLogLastError(wxT("wxBitmap::CopyFromIconOrCursor - CreateBitmap")); } else { MemoryHDC dcSrc; MemoryHDC dcDst; SelectInHDC selSrc(dcSrc, iconInfo.hbmMask); SelectInHDC selDst(dcDst, hbmp); if ( !::BitBlt((HDC)dcDst, 0, 0, w, h, (HDC)dcSrc, 0, h, SRCCOPY) ) { wxLogLastError(wxT("wxBitmap::CopyFromIconOrCursor - BitBlt")); } // Prepare the AND mask to be compatible with wxBitmap mask // by seting its bits to 0 wherever XOR mask (image) bits are set to 1. // This is done in-place by applying the following ROP: // dest = dest AND (NOT src) where dest=AND mask, src=XOR mask // // AND mask will be extracted later at creation of inverted mask. if ( !::BitBlt((HDC)dcSrc, 0, 0, w, h, (HDC)dcSrc, 0, h, DSTERASE) ) { wxLogLastError(wxT("wxBitmap::CopyFromIconOrCursor - BitBlt")); } } refData->m_width = w; refData->m_height = h; refData->m_depth = wxDisplayDepth(); refData->m_hBitmap = hbmp; } switch ( transp ) { default: wxFAIL_MSG( wxT("unknown wxBitmapTransparency value") ); wxFALLTHROUGH; case wxBitmapTransparency_None: // nothing to do, refData->m_hasAlpha is false by default break; case wxBitmapTransparency_Auto: #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 check for this. { HBITMAP hdib = 0; if ( CheckAlpha(refData->m_hBitmap, &hdib) ) refData->Set32bppHDIB(hdib); } break; #endif // wxUSE_WXDIB case wxBitmapTransparency_Always: refData->m_hasAlpha = true; break; } if ( !refData->m_hasAlpha ) { // the mask returned by GetIconInfo() is inverted compared to the usual // wxWin convention refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h)); } return true; } bool wxBitmap::CopyFromCursor(const wxCursor& cursor, wxBitmapTransparency transp) { UnRef(); if ( !cursor.IsOk() ) return false; return CopyFromIconOrCursor(cursor, transp); } bool wxBitmap::CopyFromIcon(const wxIcon& icon, wxBitmapTransparency transp) { UnRef(); if ( !icon.IsOk() ) return false; return CopyFromIconOrCursor(icon, transp); } #if wxUSE_WXDIB bool wxBitmap::CopyFromDIB(const wxDIB& dib) { wxScopedPtr newData(new wxBitmapRefData); newData->CopyFromDIB(dib); if ( !newData->IsOk() ) return false; UnRef(); m_refData = newData.release(); return true; } bool wxBitmap::IsDIB() const { return GetBitmapData() && GetBitmapData()->m_isDIB; } bool wxBitmap::ConvertToDIB() { if ( IsDIB() ) return true; wxDIB dib(*this); if ( !dib.IsOk() ) return false; // It is important to reuse the current GetBitmapData() instead of creating // a new one, as our object identity shouldn't change just because our // internal representation did, but IsSameAs() compares data pointers. return GetBitmapData()->AssignDIB(dib); } #endif // wxUSE_WXDIB wxBitmap::~wxBitmap() { } wxBitmap::wxBitmap(const char bits[], int width, int height, int depth) { 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 bit = 0; bit < 8; bit++) { 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 = const_cast(bits); } HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data); if ( !hbmp ) { wxLogLastError(wxT("CreateBitmap")); } if ( data != bits ) { free(data); } refData->m_handle = (WXHANDLE)hbmp; } wxBitmap::wxBitmap(int w, int h, const wxDC& dc) { (void)Create(w, h, dc); } wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth) { (void)Create(data, type, width, height, depth); } wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type) { LoadFile(filename, 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.IsOk(), false, wxT("invalid HDC in wxBitmap::Create()") ); const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl ); if (impl) return DoCreate(width, height, -1, impl->GetHDC()); else return false; } bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc) { UnRef(); wxCHECK_MSG( w > 0 && h > 0, false, wxT("invalid bitmap size") ); 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 if ( d > 0 ) { hbmp = ::CreateBitmap(w, h, 1, d, NULL); if ( !hbmp ) { wxLogLastError(wxT("CreateBitmap")); } GetBitmapData()->m_depth = d; } else // No valid depth, create bitmap compatible with the screen { ScreenHDC dc; hbmp = ::CreateCompatibleBitmap(dc, w, h); if ( !hbmp ) { wxLogLastError(wxT("CreateCompatibleBitmap")); } GetBitmapData()->m_depth = wxDisplayDepth(); } #endif // !ALWAYS_USE_DIB } GetBitmapData()->m_handle = (WXHANDLE)hbmp; return IsOk(); } #if wxUSE_IMAGE // ---------------------------------------------------------------------------- // 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.IsOk(), false, wxT("invalid HDC in wxBitmap::CreateFromImage()") ); const wxMSWDCImpl *impl = wxDynamicCast( dc.GetImpl(), wxMSWDCImpl ); if (impl) return CreateFromImage(image, -1, impl->GetHDC()); else return false; } #if wxUSE_WXDIB bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc) { wxCHECK_MSG( image.IsOk(), 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); // DDB obtained from CreatedDDB() can have different colour depth // than source DIB and we have to adjust respective data member // accordingly. BITMAP bm; if ( ::GetObject(hbitmap, sizeof(bm), &bm) != sizeof(bm) ) { wxLogLastError(wxS("GetObject (@wxBitmap::CreateFromImage)")); } else { refData->m_depth = bm.bmBitsPixel; } } #endif // !ALWAYS_USE_DIB // validate this object refData->m_handle = (WXHANDLE)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(wxT("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 // By default, we autodetect the presence of alpha and consider unnecessary // to create the alpha channel in wxImage if we don't have any effective // alpha in the bitmap because its depth, on its own, is not an indicator // that it uses alpha as it could be just the default screen depth. However // if the user had explicitly called UseAlpha(), then we consider // that the resulting image should really have the alpha channel too. wxImage image = dib.ConvertToImage(HasAlpha() ? wxDIB::Convert_AlphaAlwaysIf32bpp : wxDIB::Convert_AlphaAuto); if ( !image.IsOk() ) { 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, wxBitmapType type) { UnRef(); wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler); if ( handler ) { m_refData = new wxBitmapRefData; if ( !handler->LoadFile(this, filename, type, -1, -1) ) return false; #if wxUSE_WXDIB // wxBitmap must contain premultiplied data, but external files are not // always in this format, so try to detect whether this is the case and // create a premultiplied DIB if it really is. HBITMAP hdib = CreatePremultipliedDIBIfNeeded(GetHbitmap()); if ( hdib ) static_cast(m_refData)->Set32bppHDIB(hdib); #endif // wxUSE_WXDIB return true; } #if wxUSE_IMAGE && wxUSE_WXDIB else // no bitmap handler found { wxImage image; if ( image.LoadFile( filename, type ) && image.IsOk() ) { *this = wxBitmap(image); return true; } } #endif // wxUSE_IMAGE return false; } bool wxBitmap::Create(const void* data, wxBitmapType 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, wxBitmapType type, const wxPalette *palette) const { 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.IsOk() ) { 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( IsOk() && (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.IsOk(), wxT("GetSubBitmap error") ); // handle alpha channel, if any if (HasAlpha()) ret.UseAlpha(); // copy bitmap data MemoryHDC dcSrc, dcDst; { SelectInHDC selectDst(dcDst, GetHbitmapOf(ret)); if ( !selectDst ) { wxLogLastError(wxT("SelectObject(destBitmap)")); } if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height, (HDC)hdc, rect.x, rect.y, SRCCOPY) ) { wxLogLastError(wxT("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(wxT("BitBlt")); } wxMask *mask = new wxMask((WXHBITMAP) hbmpMask); ret.SetMask(mask); } return ret; } // ---------------------------------------------------------------------------- // wxBitmap accessors // ---------------------------------------------------------------------------- #if wxUSE_PALETTE wxPalette* wxBitmap::GetPalette() const { return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette : NULL; } #endif wxMask *wxBitmap::GetMask() const { return GetBitmapData() ? GetBitmapData()->GetMask() : NULL; } wxDC *wxBitmap::GetSelectedInto() const { #if wxDEBUG_LEVEL return GetBitmapData() ? GetBitmapData()->m_selectedInto : NULL; #else return NULL; #endif } void wxBitmap::UseAlpha(bool use) { if ( GetBitmapData() ) { // Only 32bpp bitmaps can contain alpha channel. if ( use && GetBitmapData()->m_depth < 32 ) use = false; GetBitmapData()->m_hasAlpha = use; } } bool wxBitmap::HasAlpha() const { return GetBitmapData() && GetBitmapData()->m_hasAlpha; } void wxBitmap::MSWUpdateAlpha() { #if wxUSE_WXDIB if ( CheckAlpha(GetHbitmap()) ) GetBitmapData()->m_hasAlpha = true; #else // !wxUSE_WXDIB GetBitmapData()->m_hasAlpha = false; #endif // wxUSE_WXDIB/!wxUSE_WXDIB } void wxBitmap::MSWBlendMaskWithAlpha() { #if defined(wxHAS_RAW_BITMAP) if ( !HasAlpha() || !GetMask() ) return; // Update alpha channel by blending original alpha values with mask and then remove the mask. // For non-masked pixels alpha channel values will remain intact and for masked pixels // they will be set to the transparent value (0). AllocExclusive(); { wxBitmap bmpMask = GetMask()->GetBitmap(); wxNativePixelData maskData(bmpMask); wxCHECK_RET(maskData, "No access to bitmap mask data"); wxAlphaPixelData bmpData(*this); wxCHECK_RET(bmpData, "No access to bitmap data"); const int w = GetWidth(); const int h = GetHeight(); wxNativePixelData::Iterator maskRowStart(maskData); wxAlphaPixelData::Iterator bmpRowStart(bmpData); for ( int y = 0; y < h; y++ ) { wxNativePixelData::Iterator pMask = maskRowStart; wxAlphaPixelData::Iterator pBmp = bmpRowStart; for ( int x = 0; x < w; x++, ++pBmp, ++pMask ) { // Masked pixel is not drawn i.e. is transparent, // non-masked pixel is untouched. if ( pMask.Red() == 0 ) { pBmp.Red() = pBmp.Green() = pBmp.Blue() = 0; // pre-multiplied pBmp.Alpha() = wxALPHA_TRANSPARENT; } } maskRowStart.OffsetY(maskData, 1); bmpRowStart.OffsetY(bmpData, 1); } } GetBitmapData()->SetMask((wxMask*)NULL); wxASSERT(HasAlpha()); wxASSERT(!GetMask()); #endif // wxHAS_RAW_BITMAP } // ---------------------------------------------------------------------------- // wxBitmap setters // ---------------------------------------------------------------------------- void wxBitmap::SetSelectedInto(wxDC *dc) { #if wxDEBUG_LEVEL if ( GetBitmapData() ) GetBitmapData()->m_selectedInto = dc; #else wxUnusedVar(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); } bool wxBitmap::InitFromHBITMAP(WXHBITMAP bmp, int width, int height, int depth) { #if wxDEBUG_LEVEL >= 2 if ( bmp != NULL ) { BITMAP bm; if ( ::GetObject(bmp, sizeof(bm), &bm) == sizeof(bm) ) { wxASSERT_MSG(bm.bmWidth == width && bm.bmHeight == height && bm.bmBitsPixel == depth, wxS("Inconsistent bitmap parameters")); } else { wxFAIL_MSG(wxS("Cannot retrieve parameters of the bitmap")); } } #endif // wxDEBUG_LEVEL >= 2 AllocExclusive(); GetBitmapData()->m_handle = (WXHANDLE)bmp; GetBitmapData()->m_width = width; GetBitmapData()->m_height = height; GetBitmapData()->m_depth = depth; return IsOk(); } // ---------------------------------------------------------------------------- // raw bitmap access support // ---------------------------------------------------------------------------- #ifdef wxHAS_RAW_BITMAP void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp) { #if wxUSE_WXDIB if ( !IsOk() ) { // 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, wxT("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( wxT("failed to get DIBSECTION from a DIB?") ); return NULL; } // check that the bitmap is in correct format if ( ds.dsBm.bmBitsPixel != bpp ) { wxFAIL_MSG( wxT("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& WXUNUSED(data)) { #if wxUSE_WXDIB if ( !IsOk() ) 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; GetBitmapData()->Free(); GetBitmapData()->CopyFromDIB(*dib); delete dib; } #endif // wxUSE_WXDIB } #endif // wxHAS_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) { wxCHECK_MSG( bitmap.IsOk() && bitmap.GetDepth() == 1, false, wxT("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; } // 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.IsOk() && bitmap.GetPalette()->IsOk()) { 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) { wxCHECK_MSG( bitmap.IsOk(), false, wxT("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(), wxT("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; } wxBitmap wxMask::GetBitmap() const { // We have to do a deep copy of the mask bitmap // and assign it to the resulting wxBitmap. // Create new bitmap with the same parameters as a mask bitmap. BITMAP bm; ::GetObject(m_maskBitmap, sizeof(bm), (LPVOID)&bm); HBITMAP hNewBitmap = ::CreateBitmapIndirect(&bm); if ( !hNewBitmap ) { wxLogLastError(wxS("CreateBitmapIndirect")); return wxNullBitmap; } // Copy the bitmap. HDC hdcSrc = ::CreateCompatibleDC((HDC)NULL); HBITMAP hSrcOldBmp = (HBITMAP)::SelectObject(hdcSrc, m_maskBitmap); HDC hdcMem = ::CreateCompatibleDC((HDC)NULL); HBITMAP hMemOldBmp = (HBITMAP)::SelectObject(hdcMem, hNewBitmap); ::BitBlt(hdcMem, 0, 0, bm.bmWidth, bm.bmHeight, hdcSrc, 0, 0, SRCCOPY); ::SelectObject(hdcMem, hMemOldBmp); // Clean up. ::SelectObject(hdcSrc, hSrcOldBmp); ::DeleteDC(hdcSrc); ::DeleteDC(hdcMem); // Create and return a new wxBitmap. wxBitmap bmp; bmp.InitFromHBITMAP((WXHBITMAP)hNewBitmap, bm.bmWidth, bm.bmHeight, bm.bmBitsPixel); return bmp; } // ---------------------------------------------------------------------------- // wxBitmapHandler // ---------------------------------------------------------------------------- bool wxBitmapHandler::Create(wxGDIImage *image, const void* data, wxBitmapType type, int width, int height, int depth) { wxBitmap *bitmap = wxDynamicCast(image, wxBitmap); return bitmap && Create(bitmap, data, type, width, height, depth); } bool wxBitmapHandler::Load(wxGDIImage *image, const wxString& name, wxBitmapType type, int width, int height) { wxBitmap *bitmap = wxDynamicCast(image, wxBitmap); return bitmap && LoadFile(bitmap, name, type, width, height); } bool wxBitmapHandler::Save(const wxGDIImage *image, const wxString& name, wxBitmapType type) const { wxBitmap *bitmap = wxDynamicCast(image, wxBitmap); return bitmap && SaveFile(bitmap, name, type); } bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap), const void* WXUNUSED(data), wxBitmapType WXUNUSED(type), int WXUNUSED(width), int WXUNUSED(height), int WXUNUSED(depth)) { return false; } bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap), const wxString& WXUNUSED(name), wxBitmapType WXUNUSED(type), int WXUNUSED(desiredWidth), int WXUNUSED(desiredHeight)) { return false; } bool wxBitmapHandler::SaveFile(const wxBitmap *WXUNUSED(bitmap), const wxString& WXUNUSED(name), wxBitmapType WXUNUSED(type), const wxPalette *WXUNUSED(palette)) const { return false; } // ---------------------------------------------------------------------------- // global helper functions implemented here // ---------------------------------------------------------------------------- // helper of wxBitmapToHICON/HCURSOR static HICON wxBitmapToIconOrCursor(const wxBitmap& bmp, bool iconWanted, int hotSpotX, int hotSpotY) { if ( !bmp.IsOk() ) { // we can't create an icon/cursor form nothing return 0; } if ( bmp.HasAlpha() ) { // Make a copy in case we would neeed to remove its mask. // If this will not be necessary, the copy is cheap as bitmaps are reference-counted. wxBitmap curBmp(bmp); // For bitmap with both alpha channel and mask we have to apply mask on our own // because 32 bpp icons don't work properly with mask bitmaps. // To do so we will create a temporary bitmap with copy of RGB data and with alpha channel // being a superposition of the original alpha values and the mask - for non-masked pixels // alpha channel values will remain intact and for masked pixels they will be set to the transparent value. if ( curBmp.GetMask() ) { curBmp.MSWBlendMaskWithAlpha(); } HBITMAP hbmp; #if wxUSE_WXDIB && wxUSE_IMAGE // CreateIconIndirect() requires non-pre-multiplied pixel data on input // as it does pre-multiplication internally itself so we need to create // a special DIB in such format to pass to it. This is inefficient but // better than creating an icon with wrong colours. AutoHBITMAP hbmpRelease; hbmp = wxDIB(curBmp.ConvertToImage(), wxDIB::PixelFormat_NotPreMultiplied).Detach(); hbmpRelease.Init(hbmp); #else // !(wxUSE_WXDIB && wxUSE_IMAGE) hbmp = GetHbitmapOf(curBmp); #endif // wxUSE_WXDIB && wxUSE_IMAGE // Create an empty mask bitmap. // it doesn't seem to work if we mess with the mask at all. AutoHBITMAP hMonoBitmap(CreateBitmap(curBmp.GetWidth(),curBmp.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 = hbmp; return ::CreateIconIndirect(&iconInfo); } 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; } AutoHBITMAP hbmpMask(wxInvertMask((HBITMAP)mask->GetMaskBitmap())); iconInfo.hbmMask = hbmpMask; 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(wxT("BitBlt")); } } HICON hicon = ::CreateIconIndirect(&iconInfo); if ( !bmp.GetMask() && !bmp.HasAlpha() ) { // we created the mask, now delete it delete mask; } 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) { wxCHECK_MSG( hbmpMask, 0, wxT("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; }