graphics.cpp

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

/////////////////////////////////////////////////////////////////////////////
// Name:        src/mac/carbon/dccg.cpp
// Purpose:     wxDC class
// Author:      Stefan Csomor
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id: graphics.cpp,v 1.34 2006/12/05 23:42:43 RD Exp $
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#if wxUSE_GRAPHICS_CONTEXT && wxMAC_USE_CORE_GRAPHICS

#include "wx/graphics.h"

#ifndef WX_PRECOMP
    #include "wx/dcclient.h"
    #include "wx/log.h"
    #include "wx/region.h"
#endif

#include "wx/mac/uma.h"

#ifdef __MSL__
    #if __MSL__ >= 0x6000
        #include "math.h"
        // in case our functions were defined outside std, we make it known all the same
        namespace std { }
        using namespace std;
    #endif
#endif

#include "wx/mac/private.h"

#if MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_4
typedef float CGFloat;
#endif
#ifndef wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
    #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 1
#else
    #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
#endif
#endif

//-----------------------------------------------------------------------------
// constants
//-----------------------------------------------------------------------------

#if !defined( __DARWIN__ ) || defined(__MWERKS__)
#ifndef M_PI
const double M_PI = 3.14159265358979;
#endif
#endif

static const double RAD2DEG = 180.0 / M_PI;

//
// Pen, Brushes and Fonts
//

#pragma mark -
#pragma mark wxMacCoreGraphicsPattern, ImagePattern, HatchPattern classes

// CGPattern wrapper class: always allocate on heap, never call destructor

class wxMacCoreGraphicsPattern
{
public :
    wxMacCoreGraphicsPattern() {}

    // is guaranteed to be called only with a non-Null CGContextRef
    virtual void Render( CGContextRef ctxRef ) = 0;

    operator CGPatternRef() const { return m_patternRef; }

protected :
    virtual ~wxMacCoreGraphicsPattern()
    {
        // as this is called only when the m_patternRef is been released;
        // don't release it again
    }

    static void _Render( void *info, CGContextRef ctxRef )
    {
        wxMacCoreGraphicsPattern* self = (wxMacCoreGraphicsPattern*) info;
        if ( self && ctxRef )
            self->Render( ctxRef );
    }

    static void _Dispose( void *info )
    {
        wxMacCoreGraphicsPattern* self = (wxMacCoreGraphicsPattern*) info;
        delete self;
    }

    CGPatternRef m_patternRef;

    static const CGPatternCallbacks ms_Callbacks;
};

const CGPatternCallbacks wxMacCoreGraphicsPattern::ms_Callbacks = { 0, &wxMacCoreGraphicsPattern::_Render, &wxMacCoreGraphicsPattern::_Dispose };

class ImagePattern : public wxMacCoreGraphicsPattern
{
public :
    ImagePattern( const wxBitmap* bmp , const CGAffineTransform& transform )
    {
        wxASSERT( bmp && bmp->Ok() );

        Init( (CGImageRef) bmp->CGImageCreate() , transform );
    }

    // ImagePattern takes ownership of CGImageRef passed in
    ImagePattern( CGImageRef image , const CGAffineTransform& transform )
    {
        if ( image )
            CFRetain( image );

        Init( image , transform );
    }

    virtual void Render( CGContextRef ctxRef )
    {
        if (m_image != NULL)
            HIViewDrawCGImage( ctxRef, &m_imageBounds, m_image );
    }

protected :
    void Init( CGImageRef image, const CGAffineTransform& transform )
    {
        m_image = image;
        if ( m_image )
        {
            m_imageBounds = CGRectMake( 0.0, 0.0, (CGFloat)CGImageGetWidth( m_image ), (CGFloat)CGImageGetHeight( m_image ) );
            m_patternRef = CGPatternCreate(
                this , m_imageBounds, transform ,
                m_imageBounds.size.width, m_imageBounds.size.height,
                kCGPatternTilingNoDistortion, true , &wxMacCoreGraphicsPattern::ms_Callbacks );
        }
    }

    virtual ~ImagePattern()
    {
        if ( m_image )
            CGImageRelease( m_image );
    }

    CGImageRef m_image;
    CGRect m_imageBounds;
};

class HatchPattern : public wxMacCoreGraphicsPattern
{
public :
    HatchPattern( int hatchstyle, const CGAffineTransform& transform )
    {
        m_hatch = hatchstyle;
        m_imageBounds = CGRectMake( 0.0, 0.0, 8.0 , 8.0 );
        m_patternRef = CGPatternCreate(
            this , m_imageBounds, transform ,
            m_imageBounds.size.width, m_imageBounds.size.height,
            kCGPatternTilingNoDistortion, false , &wxMacCoreGraphicsPattern::ms_Callbacks );
    }

    void StrokeLineSegments( CGContextRef ctxRef , const CGPoint pts[] , size_t count )
    {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
        if ( CGContextStrokeLineSegments!=NULL  )
        {
            CGContextStrokeLineSegments( ctxRef , pts , count );
        }
        else
#endif
        {
            CGContextBeginPath( ctxRef );
            for (size_t i = 0; i < count; i += 2)
            {
                CGContextMoveToPoint(ctxRef, pts[i].x, pts[i].y);
                CGContextAddLineToPoint(ctxRef, pts[i+1].x, pts[i+1].y);
            }
            CGContextStrokePath(ctxRef);
        }
    }

    virtual void Render( CGContextRef ctxRef )
    {
        switch ( m_hatch )
        {
            case wxBDIAGONAL_HATCH :
                {
                    CGPoint pts[] =
                    {
                    { 8.0 , 0.0 } , { 0.0 , 8.0 }
                    };
                    StrokeLineSegments( ctxRef , pts , 2 );
                }
                break;

            case wxCROSSDIAG_HATCH :
                {
                    CGPoint pts[] =
                    {
                        { 0.0 , 0.0 } , { 8.0 , 8.0 } ,
                        { 8.0 , 0.0 } , { 0.0 , 8.0 }
                    };
                    StrokeLineSegments( ctxRef , pts , 4 );
                }
                break;

            case wxFDIAGONAL_HATCH :
                {
                    CGPoint pts[] =
                    {
                    { 0.0 , 0.0 } , { 8.0 , 8.0 }
                    };
                    StrokeLineSegments( ctxRef , pts , 2 );
                }
                break;

            case wxCROSS_HATCH :
                {
                    CGPoint pts[] =
                    {
                    { 0.0 , 4.0 } , { 8.0 , 4.0 } ,
                    { 4.0 , 0.0 } , { 4.0 , 8.0 } ,
                    };
                    StrokeLineSegments( ctxRef , pts , 4 );
                }
                break;

            case wxHORIZONTAL_HATCH :
                {
                    CGPoint pts[] =
                    {
                    { 0.0 , 4.0 } , { 8.0 , 4.0 } ,
                    };
                    StrokeLineSegments( ctxRef , pts , 2 );
                }
                break;

            case wxVERTICAL_HATCH :
                {
                    CGPoint pts[] =
                    {
                    { 4.0 , 0.0 } , { 4.0 , 8.0 } ,
                    };
                    StrokeLineSegments( ctxRef , pts , 2 );
                }
                break;

            default:
                break;
        }
    }

protected :
    virtual ~HatchPattern() {}

    CGRect      m_imageBounds;
    int         m_hatch;
};

class wxMacCoreGraphicsPenData : public wxGraphicsObjectRefData
{
public:
    wxMacCoreGraphicsPenData( wxGraphicsRenderer* renderer, const wxPen &pen );
    ~wxMacCoreGraphicsPenData();

    void Init();
    virtual void Apply( wxGraphicsContext* context );
    virtual wxDouble GetWidth() { return m_width; }

protected :
    CGLineCap m_cap;
    wxMacCFRefHolder<CGColorRef> m_color;
    wxMacCFRefHolder<CGColorSpaceRef> m_colorSpace;

    CGLineJoin m_join;
    CGFloat m_width;

    int m_count;
    const CGFloat *m_lengths;
    CGFloat *m_userLengths;


    bool m_isPattern;
    wxMacCFRefHolder<CGPatternRef> m_pattern;
    CGFloat* m_patternColorComponents;
};

wxMacCoreGraphicsPenData::wxMacCoreGraphicsPenData( wxGraphicsRenderer* renderer, const wxPen &pen ) :
    wxGraphicsObjectRefData( renderer )
{
    Init();

    float components[4] = { pen.GetColour().Red() / 255.0 , pen.GetColour().Green() / 255.0 ,
            pen.GetColour().Blue() / 255.0 , pen.GetColour().Alpha() / 255.0 } ;
    m_color.Set( CGColorCreate( wxMacGetGenericRGBColorSpace() , components ) ) ;

    // TODO: * m_dc->m_scaleX
    m_width = pen.GetWidth();
    if (m_width <= 0.0)
        m_width = 0.1;

    switch ( pen.GetCap() )
    {
        case wxCAP_ROUND :
            m_cap = kCGLineCapRound;
            break;

        case wxCAP_PROJECTING :
            m_cap = kCGLineCapSquare;
            break;

        case wxCAP_BUTT :
            m_cap = kCGLineCapButt;
            break;

        default :
            m_cap = kCGLineCapButt;
            break;
    }

    switch ( pen.GetJoin() )
    {
        case wxJOIN_BEVEL :
            m_join = kCGLineJoinBevel;
            break;

        case wxJOIN_MITER :
            m_join = kCGLineJoinMiter;
            break;

        case wxJOIN_ROUND :
            m_join = kCGLineJoinRound;
            break;

        default :
            m_join = kCGLineJoinMiter;
            break;
    }

    const CGFloat dashUnit = m_width < 1.0 ? 1.0 : m_width;

    const CGFloat dotted[] = { dashUnit , dashUnit + 2.0 };
    static const CGFloat short_dashed[] = { 9.0 , 6.0 };
    static const CGFloat dashed[] = { 19.0 , 9.0 };
    static const CGFloat dotted_dashed[] = { 9.0 , 6.0 , 3.0 , 3.0 };

    switch ( pen.GetStyle() )
    {
        case wxSOLID :
            break;

        case wxDOT :
            m_count = WXSIZEOF(dotted);
            m_userLengths = new CGFloat[ m_count ] ;
            memcpy( m_userLengths, dotted, sizeof(dotted) );
            m_lengths = m_userLengths;
            break;

        case wxLONG_DASH :
            m_count = WXSIZEOF(dashed);
            m_lengths = dashed;
            break;

        case wxSHORT_DASH :
            m_count = WXSIZEOF(short_dashed);
            m_lengths = short_dashed;
            break;

        case wxDOT_DASH :
            m_count = WXSIZEOF(dotted_dashed);
            m_lengths = dotted_dashed;
            break;

        case wxUSER_DASH :
            wxDash *dashes;
            m_count = pen.GetDashes( &dashes );
            if ((dashes != NULL) && (m_count > 0))
            {
                m_userLengths = new CGFloat[m_count];
                for ( int i = 0; i < m_count; ++i )
                {
                    m_userLengths[i] = dashes[i] * dashUnit;

                    if ( i % 2 == 1 && m_userLengths[i] < dashUnit + 2.0 )
                        m_userLengths[i] = dashUnit + 2.0;
                    else if ( i % 2 == 0 && m_userLengths[i] < dashUnit )
                        m_userLengths[i] = dashUnit;
                }
            }
            m_lengths = m_userLengths;
            break;

        case wxSTIPPLE :
            {
                wxBitmap* bmp = pen.GetStipple();
                if ( bmp && bmp->Ok() )
                {
                    m_colorSpace.Set( CGColorSpaceCreatePattern( NULL ) );
                    m_pattern.Set( *( new ImagePattern( bmp , CGAffineTransformMakeScale( 1,-1 ) ) ) );
                    m_patternColorComponents = new CGFloat[1] ;
                    m_patternColorComponents[0] = 1.0;
                    m_isPattern = true;
                }
            }
            break;

        default :
            {