C++ wxBitmap::GetDepth方法代码示例

// Create a drag image from a bitmap and optional cursor
bool wxDragImage::Create(const wxBitmap& image, const wxCursor& cursor)
{
    if ( m_hImageList )
        ImageList_Destroy(GetHimageList());
    m_hImageList = 0;

#ifdef __WXWINCE__
    UINT flags = ILC_COLOR;
#else
    UINT flags wxDUMMY_INITIALIZE(0) ;
    if (image.GetDepth() <= 4)
        flags = ILC_COLOR4;
    else if (image.GetDepth() <= 8)
        flags = ILC_COLOR8;
    else if (image.GetDepth() <= 16)
        flags = ILC_COLOR16;
    else if (image.GetDepth() <= 24)
        flags = ILC_COLOR24;
    else
        flags = ILC_COLOR32;
#endif

    bool mask = (image.GetMask() != 0);

    // Curiously, even if the image doesn't have a mask,
    // we still have to use ILC_MASK or the image won't show
    // up when dragged.
//    if ( mask )
    flags |= ILC_MASK;

    m_hImageList = (WXHIMAGELIST) ImageList_Create(image.GetWidth(), image.GetHeight(), flags, 1, 1);

    int index;
    if (!mask)
    {
        HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
        index = ImageList_Add(GetHimageList(), hBitmap1, 0);
    }
    else
    {
        HBITMAP hBitmap1 = (HBITMAP) image.GetHBITMAP();
        HBITMAP hBitmap2 = (HBITMAP) image.GetMask()->GetMaskBitmap();
        HBITMAP hbmpMask = wxInvertMask(hBitmap2);

        index = ImageList_Add(GetHimageList(), hBitmap1, hbmpMask);
        ::DeleteObject(hbmpMask);
    }
    if ( index == -1 )
    {
        wxLogError(_("Couldn't add an image to the image list."));
    }
    m_cursor = cursor; // Can only combine with drag image after calling BeginDrag.

    return (index != -1) ;
}

void wxGCDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y,
                               bool useMask )
{
    wxCHECK_RET( IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
    wxCHECK_RET( bmp.IsOk(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );

    int w = bmp.GetScaledWidth();
    int h = bmp.GetScaledHeight();
    if ( bmp.GetDepth() == 1 )
    {
        m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
        m_graphicContext->SetBrush(m_textBackgroundColour);
        m_graphicContext->DrawRectangle( x, y, w, h );
        m_graphicContext->SetBrush(m_textForegroundColour);
        m_graphicContext->DrawBitmap( bmp, x, y, w, h );
        m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
        m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
    }
    else // not a monochrome bitmap, handle it normally
    {
        // make a copy in case we need to remove its mask, if we don't modify
        // it the copy is cheap as bitmaps are reference-counted
        wxBitmap bmpCopy(bmp);
        if ( !useMask && bmp.GetMask() )
            bmpCopy.SetMask(NULL);

        m_graphicContext->DrawBitmap( bmpCopy, x, y, w, h );
    }

    CalcBoundingBox(x, y);
    CalcBoundingBox(x + w, y + h);
}

void wxDC::DoDrawSubBitmap(const wxBitmap &bmp,
                           wxCoord x, wxCoord y, wxCoord w, wxCoord h,
                           wxCoord destx, wxCoord desty, int rop, bool useMask)
{
    wxCHECK_RET( Ok(), wxT("invalid dc") );
    wxCHECK_RET( bmp.Ok(), wxT("invalid bitmap") );

    // NB: we could also support XOR here (via DSBLIT_XOR)
    //     and possibly others via SetSrc/DstBlendFunction()
    wxCHECK_RET( rop == wxCOPY, _T("only wxCOPY function supported") );

    if ( bmp.GetDepth() == 1 )
    {
        // Mono bitmaps are handled in special way -- all 1s are drawn in
        // foreground colours, all 0s in background colour.
        wxFAIL_MSG( _T("drawing mono bitmaps not implemented") );
        return;
    }

    if ( useMask && bmp.GetMask() )
    {
        // FIXME_DFB: see MGL sources for a way to do it, but it's not directly
        //            applicable because DirectFB doesn't implement ROPs; OTOH,
        //            it has blitting modes that can be useful; finally, see
        //            DFB's SetSrcBlendFunction() and SetSrcColorKey()
        wxFAIL_MSG( _T("drawing bitmaps with masks not implemented") );
        return;
    }

    DoBlitFromSurface(bmp.GetDirectFBSurface(),
                      x, y,
                      w, h,
                      destx, desty);
}

wxBitmap ConvertTo24Bit( wxColor bgColor, wxBitmap front ) {
    if( front.GetDepth() == 24 ) return front;

    wxBitmap result( front.GetWidth(), front.GetHeight(), 24 );
    front.UseAlpha();

    wxImage im_front = front.ConvertToImage();
    wxImage im_result = result.ConvertToImage();

    unsigned char *presult = im_result.GetData();
    unsigned char *pfront = im_front.GetData();

    unsigned char *afront = NULL;
    if( im_front.HasAlpha() )
        afront = im_front.GetAlpha();

    for( int i = 0; i < result.GetWidth(); i++ ) {
        for( int j = 0; j < result.GetHeight(); j++ ) {

            double alphaF = (double) ( *afront++ ) / 256.0;
            unsigned char r = *pfront++ * alphaF + bgColor.Red() * ( 1.0 - alphaF );
            *presult++ = r;
            unsigned char g = *pfront++ * alphaF + bgColor.Green() * ( 1.0 - alphaF );
            *presult++ = g;
            unsigned char b = *pfront++ * alphaF + bgColor.Blue() * ( 1.0 - alphaF );
            *presult++ = b;
        }
    }

    result = wxBitmap( im_result );
    return result;
}

bool wxMask::InitFromMonoBitmap(const wxBitmap& bitmap)
{
    wxCHECK_MSG( bitmap.IsOk(), false, wxT("Invalid bitmap") );
    wxCHECK_MSG( bitmap.GetDepth() == 1, false, wxT("Cannot create mask from colour bitmap") );

    m_bitmap = bitmap;

    return true;
}

bool wxMask::Create(const wxBitmap& bitmap)
{
    //Only for mono bitmaps
    if (!bitmap.IsOk() || bitmap.GetDepth() != 1)
        return false;

    if (m_qtBitmap)
        delete m_qtBitmap;

    m_qtBitmap = new QBitmap(*bitmap.GetHandle());
    return true;
}

void BM2CMP_FRAME::updateImageInfo()
{
    // Note: the image resolution text controls are not modified
    // here, to avoid a race between text change when entered by user and
    // a text change if it is modifed here.
    int h  = m_Pict_Bitmap.GetHeight();
    int w  = m_Pict_Bitmap.GetWidth();
    int nb = m_Pict_Bitmap.GetDepth();

    m_SizeXValue->SetLabel( wxString::Format( wxT( "%d" ), w ) );
    m_SizeYValue->SetLabel( wxString::Format( wxT( "%d" ), h ) );
    m_BPPValue->SetLabel( wxString::Format( wxT( "%d" ), nb ) );

    m_SizeXValue_mm->SetLabel( wxString::Format( wxT( "%.1f" ),
        (double) w / m_imageDPI.x * 25.4 ) );
    m_SizeYValue_mm->SetLabel( wxString::Format( wxT( "%.1f" ),
        (double) h / m_imageDPI.y * 25.4 ) );
}

void wxGCDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool WXUNUSED(useMask) )
{
    wxCHECK_RET( Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid DC") );
    wxCHECK_RET( bmp.Ok(), wxT("wxGCDC(cg)::DoDrawBitmap - invalid bitmap") );

    if ( bmp.GetDepth() == 1 )
    {
        m_graphicContext->SetPen(*wxTRANSPARENT_PEN);
        m_graphicContext->SetBrush( wxBrush( m_textBackgroundColour , wxSOLID ) );
        m_graphicContext->DrawRectangle( x , y , bmp.GetWidth() , bmp.GetHeight() );        
        m_graphicContext->SetBrush( wxBrush( m_textForegroundColour , wxSOLID ) );
        m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
        m_graphicContext->SetBrush( m_graphicContext->CreateBrush(m_brush));
        m_graphicContext->SetPen( m_graphicContext->CreatePen(m_pen));
    }
    else
        m_graphicContext->DrawBitmap( bmp, x , y , bmp.GetWidth() , bmp.GetHeight() );
}

// Creates a bitmap with transparent areas drawn in
// the given colour.
wxBitmap wxCreateMaskedBitmap(const wxBitmap& bitmap, wxColour& colour)
{
    wxBitmap newBitmap(bitmap.GetWidth(),
                       bitmap.GetHeight(),
                       bitmap.GetDepth());
    wxMemoryDC destDC;
    wxMemoryDC srcDC;

    srcDC.SelectObject(bitmap);
    destDC.SelectObject(newBitmap);

    wxBrush brush(colour, wxSOLID);
    destDC.SetBackground(brush);
    destDC.Clear();
    destDC.Blit(0, 0, bitmap.GetWidth(), bitmap.GetHeight(),
                &srcDC, 0, 0, wxCOPY, true);

    return newBitmap;
}

wxBitmap MergeBitmaps( wxBitmap back, wxBitmap front, wxSize offset )
{
    wxBitmap merged( back.GetWidth(), back.GetHeight(), back.GetDepth() );

    //  If the front bitmap has no alpha channel, then merging will accomplish nothing
    //  So, simply return the bitmap intact
    wxImage im_front = front.ConvertToImage();
    if(!im_front.HasAlpha())
        return front;
    
#if !wxCHECK_VERSION(2,9,4)

    // Manual alpha blending for broken wxWidgets alpha bitmap support, pervasive in wx2.8.
    merged.UseAlpha();
    back.UseAlpha();
    front.UseAlpha();

//    wxImage im_front = front.ConvertToImage();
    wxImage im_back = back.ConvertToImage();
    wxImage im_result = back.ConvertToImage();// Only way to make result have alpha channel in wxW 2.8.

    unsigned char *presult = im_result.GetData();
    unsigned char *pback = im_back.GetData();
    unsigned char *pfront = im_front.GetData();

    unsigned char *afront = NULL;
    if( im_front.HasAlpha() )
    afront = im_front.GetAlpha();

    unsigned char *aback = NULL;
    if( im_back.HasAlpha() )
    aback = im_back.GetAlpha();

    unsigned char *aresult = NULL;
    if( im_result.HasAlpha() )
    aresult = im_result.GetAlpha();

    // Do alpha blending, associative version of "over" operator.
    if(presult && pback && pfront){ 
        for( int i = 0; i < back.GetHeight(); i++ ) {
            for( int j = 0; j < back.GetWidth(); j++ ) {

                int fX = j - offset.x;
                int fY = i - offset.y;

                bool inFront = true;
                if( fX < 0 || fY < 0 ) inFront = false;
                if( fX >= front.GetWidth() ) inFront = false;
                if( fY >= front.GetHeight() ) inFront = false;

                if( inFront ) {
                    double alphaF = (double) ( *afront++ ) / 256.0;
                    double alphaB = (double) ( *aback++ ) / 256.0;
                    double alphaRes = alphaF + alphaB * ( 1.0 - alphaF );
                    unsigned char a = alphaRes * 256;
                    *aresult++ = a;
                    unsigned char r = (*pfront++ * alphaF + *pback++ * alphaB * ( 1.0 - alphaF )) / alphaRes;
                    *presult++ = r;
                    unsigned char g = (*pfront++ * alphaF + *pback++ * alphaB * ( 1.0 - alphaF )) / alphaRes;
                    *presult++ = g;
                    unsigned char b = (*pfront++ * alphaF + *pback++ * alphaB * ( 1.0 - alphaF )) / alphaRes;
                    *presult++ = b;
                } else {
                    *aresult++ = *aback++;
                    *presult++ = *pback++;
                    *presult++ = *pback++;
                    *presult++ = *pback++;
                }
            }
        }
    }
    merged = wxBitmap( im_result );

#else
    wxMemoryDC mdc( merged );
    mdc.DrawBitmap( back, 0, 0, true );
    mdc.DrawBitmap( front, offset.x, offset.y, true );
    mdc.SelectObject( wxNullBitmap );
#endif

    return merged;
}

wxBitmap MergeBitmaps( wxBitmap back, wxBitmap front, wxSize offset )
{
    wxBitmap merged( back.GetWidth(), back.GetHeight(), back.GetDepth() );
#if (defined(__WXGTK__) || defined(__WXMAC__))

    // Manual alpha blending for broken wxWidgets platforms.

    merged.UseAlpha();
    back.UseAlpha();
    front.UseAlpha();

    wxImage im_front = front.ConvertToImage();
    wxImage im_back = back.ConvertToImage();
    wxImage im_result = back.ConvertToImage();// Only way to make result have alpha channel in wxW 2.8.

    unsigned char *presult = im_result.GetData();
    unsigned char *pback = im_back.GetData();
    unsigned char *pfront = im_front.GetData();

    unsigned char *afront = NULL;
    if( im_front.HasAlpha() )
        afront = im_front.GetAlpha();

    unsigned char *aback = NULL;
    if( im_back.HasAlpha() )
        aback = im_back.GetAlpha();

    unsigned char *aresult = NULL;
    if( im_result.HasAlpha() )
        aresult = im_result.GetAlpha();

    // Do alpha blending, associative version of "over" operator.

    for( int i = 0; i < back.GetHeight(); i++ ) {
        for( int j = 0; j < back.GetWidth(); j++ ) {

            int fX = j - offset.x;
            int fY = i - offset.y;

            bool inFront = true;
            if( fX < 0 || fY < 0 ) inFront = false;
            if( fX >= front.GetWidth() ) inFront = false;
            if( fY >= front.GetHeight() ) inFront = false;

            if( inFront ) {
                double alphaF = (double) ( *afront++ ) / 256.0;
                double alphaB = (double) ( *aback++ ) / 256.0;
                double alphaRes = alphaF + alphaB * ( 1.0 - alphaF );
                unsigned char a = alphaRes * 256;
                *aresult++ = a;
                unsigned char r = (*pfront++ * alphaF + *pback++ * alphaB * ( 1.0 - alphaF )) / alphaRes;
                *presult++ = r;
                unsigned char g = (*pfront++ * alphaF + *pback++ * alphaB * ( 1.0 - alphaF )) / alphaRes;
                *presult++ = g;
                unsigned char b = (*pfront++ * alphaF + *pback++ * alphaB * ( 1.0 - alphaF )) / alphaRes;
                *presult++ = b;
            } else {
                *aresult++ = *aback++;
                *presult++ = *pback++;
                *presult++ = *pback++;
                *presult++ = *pback++;
            }
        }
    }

    merged = wxBitmap( im_result );

#else
    wxMemoryDC mdc( merged );
    mdc.DrawBitmap( back, 0, 0, true );
    mdc.DrawBitmap( front, offset.x, offset.y, true );
    mdc.SelectObject( wxNullBitmap );
#endif

    return merged;
}