dc.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

                        ::PaintRgn( clipRgn ) ;
                    }
                    else if ( logical_func == wxCLEAR )
                    {
                        RGBColor col= { 0x0000, 0x0000, 0x0000 } ;
                        ::RGBForeColor( &col  ) ;
                        ::PaintRgn( clipRgn ) ;
                    }
                    else if ( logical_func == wxINVERT )
                    {
                        MacInvertRgn( clipRgn ) ;
                    }
                    else
                    {
                        for ( int y = 0 ; y < srcrect.right - srcrect.left ; ++y )
                        {
                            for ( int x = 0 ; x < srcrect.bottom - srcrect.top ; ++x )
                            {
                                Point dstPoint = { dstrect.top + y , dstrect.left + x } ;
                                Point srcPoint = { srcrect.top + y , srcrect.left + x } ;
                                if ( PtInRgn( dstPoint , clipRgn ) )
                                {
                                    RGBColor srcColor, dstColor ;

                                    // NOTE: Get/SetCPixel are slow!
                                    SetPort( (GrafPtr) sourcePort ) ;
                                    GetCPixel( srcPoint.h , srcPoint.v , &srcColor ) ;
                                    SetPort( (GrafPtr) m_macPort ) ;
                                    GetCPixel( dstPoint.h , dstPoint.v , &dstColor ) ;
                                    wxMacCalculateColour( logical_func , srcColor , dstColor ) ;
                                    SetCPixel( dstPoint.h , dstPoint.v , &dstColor ) ;
                                }
                            }
                        }
                    }
                }
                else
                {
                    if ( invertDestinationFirst )
                        MacInvertRgn( clipRgn ) ;

                    CopyBits( GetPortBitMapForCopyBits( sourcePort ) ,
                        GetPortBitMapForCopyBits( MAC_WXHBITMAP(m_macPort) ) ,
                        &srcrect, &dstrect, mode, clipRgn ) ;
                }

                DisposeRgn( clipRgn ) ;
            }
        }
        else
        {
            RgnHandle clipRgn = NewRgn() ;
            SetRectRgn( clipRgn , dstrect.left , dstrect.top , dstrect.right , dstrect.bottom ) ;

            if ( mode == kEmulatedMode )
            {
                Pattern pat ;

                ::PenPat(GetQDGlobalsBlack(&pat));
                if ( logical_func == wxSET )
                {
                    RGBColor col= { 0xFFFF, 0xFFFF, 0xFFFF } ;
                    ::RGBForeColor( &col  ) ;
                    ::PaintRgn( clipRgn ) ;
                }
                else if ( logical_func == wxCLEAR )
                {
                    RGBColor col = { 0x0000, 0x0000, 0x0000 } ;

                    ::RGBForeColor( &col  ) ;
                    ::PaintRgn( clipRgn ) ;
                }
                else if ( logical_func == wxINVERT )
                {
                    MacInvertRgn( clipRgn ) ;
                }
                else
                {
                    for ( int y = 0 ; y < srcrect.right - srcrect.left ; ++y )
                    {
                        for ( int x = 0 ; x < srcrect.bottom - srcrect.top ; ++x )
                        {
                            Point dstPoint = { dstrect.top + y , dstrect.left + x } ;
                            Point srcPoint = { srcrect.top + y , srcrect.left + x } ;
                            {
                                RGBColor srcColor, dstColor ;

                                // NOTE: Get/SetCPixel are slow!
                                SetPort( (GrafPtr) sourcePort ) ;
                                GetCPixel( srcPoint.h , srcPoint.v , &srcColor) ;
                                SetPort( (GrafPtr) m_macPort ) ;
                                GetCPixel( dstPoint.h , dstPoint.v , &dstColor ) ;
                                wxMacCalculateColour( logical_func , srcColor , dstColor ) ;
                                SetCPixel( dstPoint.h , dstPoint.v , &dstColor ) ;
                            }
                        }
                    }
                }
            }
            else
            {
                if ( invertDestinationFirst )
                    MacInvertRgn( clipRgn ) ;

                CopyBits( GetPortBitMapForCopyBits( sourcePort ) ,
                    GetPortBitMapForCopyBits( MAC_WXHBITMAP(m_macPort) ) ,
                    &srcrect, &dstrect, mode, NULL ) ;
            }

            DisposeRgn( clipRgn ) ;
        }

        UnlockPixels( bmappixels ) ;
    }

    m_macPenInstalled = false ;
    m_macBrushInstalled = false ;
    m_macFontInstalled = false ;

    return true;
}

void wxDC::DoDrawRotatedText(const wxString& str, wxCoord x, wxCoord y,
                              double angle)
{
    wxCHECK_RET( Ok(), wxT("wxDC::DoDrawRotatedText - invalid DC") );

    if ( str.empty() )
        return ;

    wxMacFastPortSetter helper(this) ;
    MacInstallFont() ;

    OSStatus status = noErr ;
    ATSUTextLayout atsuLayout ;

    wxMacUniCharBuffer unibuf( str ) ;
    UniCharCount chars = unibuf.GetChars() ;

    status = ::ATSUCreateTextLayoutWithTextPtr( unibuf.GetBuffer() , 0 , chars , chars , 1 ,
        &chars , (ATSUStyle*) &m_macATSUIStyle , &atsuLayout ) ;

    wxASSERT_MSG( status == noErr , wxT("couldn't create the layout of the rotated text") );

    status = ::ATSUSetTransientFontMatching( atsuLayout , true ) ;
    wxASSERT_MSG( status == noErr , wxT("couldn't setup transient font matching") );

    int iAngle = int( angle );
    int drawX = XLOG2DEVMAC(x) ;
    int drawY = YLOG2DEVMAC(y) ;

    ATSUTextMeasurement textBefore, textAfter ;
    ATSUTextMeasurement ascent, descent ;

    ATSLineLayoutOptions layoutOptions = kATSLineNoLayoutOptions ;

    if (m_font.GetNoAntiAliasing())
    {
        layoutOptions |= kATSLineNoAntiAliasing ;
    }

    Fixed atsuAngle = IntToFixed( iAngle ) ;

    ATSUAttributeTag atsuTags[] =
    {
        kATSULineLayoutOptionsTag ,
        kATSULineRotationTag ,
    } ;

    ByteCount atsuSizes[sizeof(atsuTags)/sizeof(ATSUAttributeTag)] =
    {
        sizeof( ATSLineLayoutOptions ) ,
        sizeof( Fixed ) ,
    } ;

    ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags)/sizeof(ATSUAttributeTag)] =
    {
        &layoutOptions ,
        &atsuAngle ,
    } ;

    status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags)/sizeof(ATSUAttributeTag) - ( abs(iAngle) > 0.001 ? 0 : 1),
            atsuTags, atsuSizes, atsuValues ) ;

    status = ::ATSUMeasureText( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        &textBefore , &textAfter, &ascent , &descent );
    wxASSERT_MSG( status == noErr , wxT("couldn't measure the rotated text") );

    if ( m_backgroundMode == wxSOLID )
    {
        // background painting must be done by hand, cannot be done by ATSUI
        wxCoord x2 , y2 ;
        PolyHandle polygon = OpenPoly();

        ::MoveTo(drawX, drawY);

        x2 = (int) (drawX + sin(angle / RAD2DEG) * FixedToInt(ascent + descent)) ;
        y2 = (int) (drawY + cos(angle / RAD2DEG) * FixedToInt(ascent + descent)) ;
        ::LineTo(x2, y2);

        x2 = (int) (drawX + sin(angle / RAD2DEG) * FixedToInt(ascent + descent ) + cos(angle / RAD2DEG) * FixedToInt(textAfter)) ;
        y2 = (int) (drawY + cos(angle / RAD2DEG) * FixedToInt(ascent + descent) - sin(angle / RAD2DEG) * FixedToInt(textAfter)) ;
        ::LineTo(x2, y2);

        x2 = (int) (drawX + cos(angle / RAD2DEG) * FixedToInt(textAfter)) ;
        y2 = (int) (drawY - sin(angle / RAD2DEG) * FixedToInt(textAfter)) ;
        ::LineTo(x2, y2);

        ::LineTo( drawX, drawY) ;
        ClosePoly();

        ::ErasePoly( polygon );
        KillPoly( polygon );
    }

    drawX += (int)(sin(angle / RAD2DEG) * FixedToInt(ascent));
    drawY += (int)(cos(angle / RAD2DEG) * FixedToInt(ascent));
    status = ::ATSUDrawText( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        IntToFixed(drawX) , IntToFixed(drawY) );

    wxASSERT_MSG( status == noErr , wxT("couldn't draw the rotated text") );

    Rect rect ;
    status = ::ATSUMeasureTextImage( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        IntToFixed(drawX) , IntToFixed(drawY) , &rect );
    wxASSERT_MSG( status == noErr , wxT("couldn't measure the rotated text") );

    OffsetRect( &rect , -m_macLocalOrigin.x , -m_macLocalOrigin.y ) ;
    CalcBoundingBox(XDEV2LOG(rect.left), YDEV2LOG(rect.top) );
    CalcBoundingBox(XDEV2LOG(rect.right), YDEV2LOG(rect.bottom) );
    ::ATSUDisposeTextLayout(atsuLayout);
}

void wxDC::DoDrawText(const wxString& strtext, wxCoord x, wxCoord y)
{
    DoDrawRotatedText( strtext , x , y , 0) ;
}

bool wxDC::CanGetTextExtent() const
{
    wxCHECK_MSG(Ok(), false, wxT("wxDC::CanGetTextExtent - invalid DC"));

    return true ;
}


void wxDC::DoGetTextExtent( const wxString &str, wxCoord *width, wxCoord *height,
                            wxCoord *descent, wxCoord *externalLeading ,
                            wxFont *theFont ) const
{
    wxCHECK_RET(Ok(), wxT("wxDC::DoGetTextExtent - invalid DC"));

    wxMacFastPortSetter helper(this) ;
    wxFont formerFont = m_font ;
    if ( theFont )
    {
        // work around the constness
        *((wxFont*)(&m_font)) = *theFont ;
    }

    MacInstallFont() ;

    OSStatus status = noErr ;
    ATSUTextLayout atsuLayout ;

    wxMacUniCharBuffer unibuf( str ) ;
    UniCharCount chars = unibuf.GetChars() ;

    status = ::ATSUCreateTextLayoutWithTextPtr( unibuf.GetBuffer() , 0 , chars , chars , 1 ,
        &chars , (ATSUStyle*) &m_macATSUIStyle , &atsuLayout ) ;

    wxASSERT_MSG( status == noErr , wxT("couldn't create the layout of the text") );

    status = ::ATSUSetTransientFontMatching( atsuLayout , true ) ;
    wxASSERT_MSG( status == noErr , wxT("couldn't setup transient font matching") );

    ATSLineLayoutOptions layoutOptions = kATSLineNoLayoutOptions ;

    if (m_font.GetNoAntiAliasing())
    {
        layoutOptions |= kATSLineNoAntiAliasing ;
    }

    ATSUAttributeTag atsuTags[] =
    {
        kATSULineLayoutOptionsTag ,
    } ;

    ByteCount atsuSizes[sizeof(atsuTags)/sizeof(ATSUAttributeTag)] =
    {
        sizeof( ATSLineLayoutOptions ) ,
    } ;

    ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags)/sizeof(ATSUAttributeTag)] =
    {
        &layoutOptions ,
    } ;

    status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags)/sizeof(ATSUAttributeTag) ,
            atsuTags, atsuSizes, atsuValues ) ;

    ATSUTextMeasurement textBefore, textAfter ;
    ATSUTextMeasurement textAscent, textDescent ;

    status = ::ATSUGetUnjustifiedBounds( atsuLayout, kATSUFromTextBeginning, kATSUToTextEnd,
        &textBefore , &textAfter, &textAscent , &textDescent );

    if ( height )
        *height = YDEV2LOGREL( FixedToInt(textAscent + textDescent) ) ;
    if ( descent )
        *descent =YDEV2LOGREL( FixedToInt(textDescent) );
    if ( externalLeading )
        *externalLeading = 0 ;
    if ( width )
        *width = XDEV2LOGREL( FixedToInt(textAfter - textBefore) ) ;

    ::ATSUDisposeTextLayout(atsuLayout);


    if ( theFont )
    {
        // work around the constness
        *((wxFont*)(&m_font)) = formerFont ;
        m_macFontInstalled = false ;
    }
}

bool wxDC::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
{
    wxCHECK_MSG(Ok(), false, wxT("wxDC::DoGetPartialTextExtents - invalid DC"));

    widths.Empty();
    widths.Add(0, text.length());

    if (text.length() == 0)
        return false;

    wxMacFastPortSetter helper(this) ;
    MacInstallFont() ;

    OSStatus status = noErr ;
    ATSUTextLayout atsuLayout ;

    wxMacUniCharBuffer unibuf( text ) ;
    UniCharCount chars = unibuf.GetChars() ;

    status = ::ATSUCreateTextLayoutWithTextPtr( unibuf.GetBuffer() , 0 , chars , chars , 1 ,
        &chars , (ATSUStyle*) &m_macATSUIStyle , &atsuLayout ) ;

    wxASSERT_MSG( status == noErr , wxT("couldn't create the layout of the text") );

    status = ::ATSUSetTransientFontMatching( atsuLayout , true ) ;
    wxASSERT_MSG( status == noErr , wxT("couldn't setup transient font matching") );

    ATSLineLayoutOptions layoutOptions = kATSLineNoLayoutOptions ;

    if (m_font.GetNoAntiAliasing())
    {
        layoutOptions |= kATSLineNoAntiAliasing ;
    }

    ATSUAttributeTag atsuTags[] =
    {
        kATSULineLayoutOptionsTag ,
    } ;

    ByteCount atsuSizes[sizeof(atsuTags)/sizeof(ATSUAttributeTag)] =
    {
        sizeof( ATSLineLayoutOptions ) ,
    } ;

    ATSUAttributeValuePtr    atsuValues[sizeof(atsuTags)/sizeof(ATSUAttributeTag)] =
    {
        &layoutOptions ,
    } ;

    status = ::ATSUSetLayoutControls(atsuLayout , sizeof(atsuTags)/sizeof(ATSUAttributeTag) ,
            atsuTags, atsuSizes, atsuValues ) ;

    for ( int pos = 0; pos < (int)chars ; pos ++ )
    {
        unsigned long actualNumberOfBounds = 0;
        ATSTrapezoid glyphBounds;

        // We get a single bound, since the text should only require one. If it requires more, there is an issue
        OSStatus result;
        result = ATSUGetGlyphBounds( atsuLayout, 0, 0, kATSUFromTextBeginning, pos + 1,
            kATSUseDeviceOrigins, 1, &glyphBounds, &actualNumberOfBounds );
        if (result != noErr || actualNumberOfBounds != 1 )
            return false;

        widths[pos] = XDEV2LOGREL(FixedToInt( glyphBounds.upperRight.x - glyphBounds.upperLeft.x ));
    }

    ::ATSUDisposeTextLayout(atsuLayout);

    return true;
}

wxCoord wxDC::GetCharWidth(void) const
{
    wxCoord width = 0 ;
    DoGetTextExtent( wxT("g"), &width , NULL , NULL , NULL , NULL ) ;
    return width ;
}

wxCoord wxDC::GetCharHeight(void) const
{
    wxCoord height ;
    DoGetTextExtent( wxT("g") , NULL , &height , NULL , NULL , NULL ) ;
    return height ;
}

void wxDC::Clear(void)
{
    wxCHECK_RET(Ok(), wxT("wxDC::Clear - invalid DC"));

    wxMacFastPortSetter helper(this) ;
    Rect rect = { -31000 , -31000 , 31000 , 31000 } ;

    if ( m_backgroundBrush.Ok() && m_backgroundBrush.GetStyle() != wxTRANSPARENT)
    {
        ::PenNormal() ;
        MacSetupBackgroundForCurrentPort( m_backgroundBrush ) ;
        ::EraseRect( &rect ) ;
    }
}

void wxDC::MacInstallFont() const
{
    wxCHECK_RET(Ok(), wxT("Invalid DC"));

    //    if ( m_macFontInstalled )
    //        return ;

    Pattern blackColor ;
    MacSetupBackgroundForCurrentPort(m_backgroundBrush) ;
    if ( m_backgroundMode != wxTRANSPARENT )
    {
        Pattern whiteColor ;
        ::BackPat(GetQDGlobalsWhite(&whiteColor));
    }

    wxASSERT( m_font.Ok() ) ;

    ::TextFont( m_font.MacGetFontNum() ) ;
    ::TextSize( (short)(m_scaleY * m_font.MacGetFontSize()) ) ;