src/generic/graphicc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/graphicc.cpp
   3 // Purpose:     cairo device context class
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     2006-10-03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2006 Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #include "wx/dc.h"
  15
  16 #ifdef __BORLANDC__
  17 #pragma hdrstop
  18 #endif
  19
  20 #ifndef WX_PRECOMP
  21 #include "wx/image.h"
  22 #include "wx/window.h"
  23 #include "wx/dc.h"
  24 #include "wx/utils.h"
  25 #include "wx/dialog.h"
  26 #include "wx/app.h"
  27 #include "wx/bitmap.h"
  28 #include "wx/dcmemory.h"
  29 #include "wx/log.h"
  30 #include "wx/icon.h"
  31 #include "wx/dcprint.h"
  32 #include "wx/module.h"
  33 #endif
  34
  35 #ifdef __WXGTK__
  36 #include "wx/gtk/win_gtk.h"
  37 #endif
  38
  39 #include "wx/graphics.h"
  40 #include "wx/rawbmp.h"
  41
  42 #if wxUSE_GRAPHICS_CONTEXT
  43
  44 #include <vector>
  45
  46 using namespace std;
  47
  48 //-----------------------------------------------------------------------------
  49 // constants
  50 //-----------------------------------------------------------------------------
  51
  52 const double RAD2DEG = 180.0 / M_PI;
  53
  54 //-----------------------------------------------------------------------------
  55 // Local functions
  56 //-----------------------------------------------------------------------------
  57
  58 static inline double dmin(double a, double b)
  59 {
  60     return a < b ? a : b;
  61 }
  62 static inline double dmax(double a, double b)
  63 {
  64     return a > b ? a : b;
  65 }
  66
  67 static inline double DegToRad(double deg)
  68 {
  69     return (deg * M_PI) / 180.0;
  70 }
  71 static inline double RadToDeg(double deg)
  72 {
  73     return (deg * 180.0) / M_PI;
  74 }
  75
  76 //-----------------------------------------------------------------------------
  77 // device context implementation
  78 //
  79 // more and more of the dc functionality should be implemented by calling
  80 // the appropricate wxCairoContext, but we will have to do that step by step
  81 // also coordinate conversions should be moved to native matrix ops
  82 //-----------------------------------------------------------------------------
  83
  84 // we always stock two context states, one at entry, to be able to preserve the
  85 // state we were called with, the other one after changing to HI Graphics orientation
  86 // (this one is used for getting back clippings etc)
  87
  88 //-----------------------------------------------------------------------------
  89 // wxGraphicsPath implementation
  90 //-----------------------------------------------------------------------------
  91
  92 // TODO remove this dependency (gdiplus needs the macros)
  93
  94 #ifndef max
  95 #define max(a,b)            (((a) > (b)) ? (a) : (b))
  96 #endif
  97
  98 #ifndef min
  99 #define min(a,b)            (((a) < (b)) ? (a) : (b))
 100 #endif
 101
 102 #include <cairo.h>
 103 #ifdef __WXGTK__
 104 #include <gtk/gtk.h>
 105 #endif
 106
 107 class WXDLLIMPEXP_CORE wxCairoPathData : public wxGraphicsPathData
 108 {
 109 public :
 110     wxCairoPathData(wxGraphicsRenderer* renderer, cairo_t* path = NULL);
 111     ~wxCairoPathData();
 112
 113     virtual wxGraphicsObjectRefData *Clone() const;
 114
 115     //
 116     // These are the path primitives from which everything else can be constructed
 117     //
 118
 119     // begins a new subpath at (x,y)
 120     virtual void MoveToPoint( wxDouble x, wxDouble y );
 121
 122     // adds a straight line from the current point to (x,y)
 123     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 124
 125     // adds a cubic Bezier curve from the current point, using two control points and an end point
 126     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );
 127
 128
 129     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 130     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) ;
 131
 132     // gets the last point of the current path, (0,0) if not yet set
 133     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 134
 135     // adds another path
 136     virtual void AddPath( const wxGraphicsPathData* path );
 137
 138     // closes the current sub-path
 139     virtual void CloseSubpath();
 140
 141     //
 142     // These are convenience functions which - if not available natively will be assembled
 143     // using the primitives from above
 144     //
 145
 146     /*
 147
 148     // appends a rectangle as a new closed subpath
 149     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) ;
 150     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 151     virtual void AddEllipsis( wxDouble x, wxDouble y, wxDouble w , wxDouble h ) ;
 152
 153     // draws a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1)
 154     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )  ;
 155     */
 156
 157     // returns the native path
 158     virtual void * GetNativePath() const ;
 159
 160     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 161     virtual void UnGetNativePath(void *p) const;
 162
 163     // transforms each point of this path by the matrix
 164     virtual void Transform( const wxGraphicsMatrixData* matrix ) ;
 165
 166     // gets the bounding box enclosing all points (possibly including control points)
 167     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const;
 168
 169     virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxWINDING_RULE) const;
 170
 171 private :
 172     cairo_t* m_pathContext;
 173 };
 174
 175 class WXDLLIMPEXP_CORE wxCairoMatrixData : public wxGraphicsMatrixData
 176 {
 177 public :
 178     wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix = NULL ) ;
 179     virtual ~wxCairoMatrixData() ;
 180
 181     virtual wxGraphicsObjectRefData *Clone() const ;
 182
 183     // concatenates the matrix
 184     virtual void Concat( const wxGraphicsMatrixData *t );
 185
 186     // sets the matrix to the respective values
 187     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 188         wxDouble tx=0.0, wxDouble ty=0.0);
 189
 190     // gets the component valuess of the matrix
 191     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 192                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 193
 194     // makes this the inverse matrix
 195     virtual void Invert();
 196
 197     // returns true if the elements of the transformation matrix are equal ?
 198     virtual bool IsEqual( const wxGraphicsMatrixData* t) const ;
 199
 200     // return true if this is the identity matrix
 201     virtual bool IsIdentity() const;
 202
 203     //
 204     // transformation
 205     //
 206
 207     // add the translation to this matrix
 208     virtual void Translate( wxDouble dx , wxDouble dy );
 209
 210     // add the scale to this matrix
 211     virtual void Scale( wxDouble xScale , wxDouble yScale );
 212
 213     // add the rotation to this matrix (radians)
 214     virtual void Rotate( wxDouble angle );
 215
 216     //
 217     // apply the transforms
 218     //
 219
 220     // applies that matrix to the point
 221     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 222
 223     // applies the matrix except for translations
 224     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 225
 226     // returns the native representation
 227     virtual void * GetNativeMatrix() const;
 228 private:
 229     cairo_matrix_t m_matrix ;
 230 } ;
 231
 232 class WXDLLIMPEXP_CORE wxCairoPenData : public wxGraphicsObjectRefData
 233 {
 234 public:
 235     wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen );
 236     ~wxCairoPenData();
 237
 238     void Init();
 239
 240     virtual void Apply( wxGraphicsContext* context );
 241     virtual wxDouble GetWidth() { return m_width; }
 242
 243 private :
 244     double m_width;
 245
 246     double m_red;
 247     double m_green;
 248     double m_blue;
 249     double m_alpha;
 250
 251     cairo_line_cap_t m_cap;
 252     cairo_line_join_t m_join;
 253
 254     int m_count;
 255     const double *m_lengths;
 256     double *m_userLengths;
 257
 258     wxPen m_pen;
 259 };
 260
 261 class WXDLLIMPEXP_CORE wxCairoBrushData : public wxGraphicsObjectRefData
 262 {
 263 public:
 264     wxCairoBrushData( wxGraphicsRenderer* renderer );
 265     wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush );
 266     ~wxCairoBrushData ();
 267
 268     virtual void Apply( wxGraphicsContext* context );
 269     void CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 270         const wxColour&c1, const wxColour&c2 );
 271     void CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 272         const wxColour &oColor, const wxColour &cColor );
 273
 274 protected:
 275     virtual void Init();
 276
 277 private :
 278     double m_red;
 279     double m_green;
 280     double m_blue;
 281     double m_alpha;
 282
 283     cairo_pattern_t* m_brushPattern;
 284 };
 285
 286 class wxCairoFontData : public wxGraphicsObjectRefData
 287 {
 288 public:
 289     wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font, const wxColour& col );
 290     ~wxCairoFontData();
 291
 292     virtual void Apply( wxGraphicsContext* context );
 293 private :
 294     wxCharBuffer m_fontName;
 295     double m_size;
 296     cairo_font_slant_t m_slant;
 297     cairo_font_weight_t m_weight;
 298     double m_red;
 299     double m_green;
 300     double m_blue;
 301     double m_alpha;
 302 };
 303
 304 class WXDLLIMPEXP_CORE wxCairoContext : public wxGraphicsContext
 305 {
 306     DECLARE_NO_COPY_CLASS(wxCairoContext)
 307
 308 public:
 309     wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc );
 310 #ifdef __WXGTK__
 311     wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable );
 312 #endif
 313     wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context );
 314     wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window);
 315     wxCairoContext();
 316     virtual ~wxCairoContext();
 317
 318     virtual void Clip( const wxRegion &region );
 319
 320     // clips drawings to the rect
 321     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 322
 323     // resets the clipping to original extent
 324     virtual void ResetClip();
 325
 326     virtual void * GetNativeContext();
 327
 328     virtual void StrokePath( const wxGraphicsPath& p );
 329     virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxWINDING_RULE );
 330
 331     virtual void Translate( wxDouble dx , wxDouble dy );
 332     virtual void Scale( wxDouble xScale , wxDouble yScale );
 333     virtual void Rotate( wxDouble angle );
 334
 335     // concatenates this transform with the current transform of this context
 336     virtual void ConcatTransform( const wxGraphicsMatrix& matrix );
 337
 338     // sets the transform of this context
 339     virtual void SetTransform( const wxGraphicsMatrix& matrix );
 340
 341     // gets the matrix of this context
 342     virtual wxGraphicsMatrix GetTransform() const;
 343
 344     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 345     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 346     virtual void PushState();
 347     virtual void PopState();
 348
 349     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y);
 350     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
 351                                 wxDouble *descent, wxDouble *externalLeading ) const;
 352     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
 353
 354 private:
 355     cairo_t* m_context;
 356 };
 357
 358 //-----------------------------------------------------------------------------
 359 // wxCairoPenData implementation
 360 //-----------------------------------------------------------------------------
 361
 362 wxCairoPenData::~wxCairoPenData()
 363 {
 364     delete[] m_userLengths;
 365 }
 366
 367 void wxCairoPenData::Init()
 368 {
 369     m_lengths = NULL;
 370     m_userLengths = NULL;
 371     m_width = 0;
 372     m_count = 0;
 373 }
 374
 375 wxCairoPenData::wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen )
 376 : wxGraphicsObjectRefData(renderer)
 377 {
 378     Init();
 379     m_pen = pen;
 380     m_width = m_pen.GetWidth();
 381     if (m_width <= 0.0)
 382         m_width = 0.1;
 383
 384     m_red = m_pen.GetColour().Red()/255.0;
 385     m_green = m_pen.GetColour().Green()/255.0;
 386     m_blue = m_pen.GetColour().Blue()/255.0;
 387     m_alpha = m_pen.GetColour().Alpha()/255.0;
 388
 389     switch ( m_pen.GetCap() )
 390     {
 391     case wxCAP_ROUND :
 392         m_cap = CAIRO_LINE_CAP_ROUND;
 393         break;
 394
 395     case wxCAP_PROJECTING :
 396         m_cap = CAIRO_LINE_CAP_SQUARE;
 397         break;
 398
 399     case wxCAP_BUTT :
 400         m_cap = CAIRO_LINE_CAP_BUTT;
 401         break;
 402
 403     default :
 404         m_cap = CAIRO_LINE_CAP_BUTT;
 405         break;
 406     }
 407
 408     switch ( m_pen.GetJoin() )
 409     {
 410     case wxJOIN_BEVEL :
 411         m_join = CAIRO_LINE_JOIN_BEVEL;
 412         break;
 413
 414     case wxJOIN_MITER :
 415         m_join = CAIRO_LINE_JOIN_MITER;
 416         break;
 417
 418     case wxJOIN_ROUND :
 419         m_join = CAIRO_LINE_JOIN_ROUND;
 420         break;
 421
 422     default :
 423         m_join = CAIRO_LINE_JOIN_MITER;
 424         break;
 425     }
 426
 427     const double dashUnit = m_width < 1.0 ? 1.0 : m_width;
 428     const double dotted[] =
 429     {
 430         dashUnit , dashUnit + 2.0
 431     };
 432     static const double short_dashed[] =
 433     {
 434         9.0 , 6.0
 435     };
 436     static const double dashed[] =
 437     {
 438         19.0 , 9.0
 439     };
 440     static const double dotted_dashed[] =
 441     {
 442         9.0 , 6.0 , 3.0 , 3.0
 443     };
 444
 445     switch ( m_pen.GetStyle() )
 446     {
 447     case wxSOLID :
 448         break;
 449
 450     case wxDOT :
 451         m_count = WXSIZEOF(dotted);
 452         m_userLengths = new double[ m_count ] ;
 453         memcpy( m_userLengths, dotted, sizeof(dotted) );
 454         m_lengths = m_userLengths;
 455         break;
 456
 457     case wxLONG_DASH :
 458         m_lengths = dotted ;
 459         m_count = WXSIZEOF(dashed);
 460         break;
 461
 462     case wxSHORT_DASH :
 463         m_lengths = dotted ;
 464         m_count = WXSIZEOF(short_dashed);
 465         break;
 466
 467     case wxDOT_DASH :
 468         m_lengths = dotted ;
 469         m_count = WXSIZEOF(dotted_dashed);
 470         break;
 471
 472     case wxUSER_DASH :
 473         {
 474             wxDash *wxdashes ;
 475             m_count = m_pen.GetDashes( &wxdashes ) ;
 476             if ((wxdashes != NULL) && (m_count > 0))
 477             {
 478                 m_userLengths = new double[m_count] ;
 479                 for ( int i = 0 ; i < m_count ; ++i )
 480                 {
 481                     m_userLengths[i] = wxdashes[i] * dashUnit ;
 482
 483                     if ( i % 2 == 1 && m_userLengths[i] < dashUnit + 2.0 )
 484                         m_userLengths[i] = dashUnit + 2.0 ;
 485                     else if ( i % 2 == 0 && m_userLengths[i] < dashUnit )
 486                         m_userLengths[i] = dashUnit ;
 487                 }
 488             }
 489             m_lengths = m_userLengths ;
 490         }
 491         break;
 492     case wxSTIPPLE :
 493         {
 494             /*
 495             wxBitmap* bmp = pen.GetStipple();
 496             if ( bmp && bmp->Ok() )
 497             {
 498             wxDELETE( m_penImage );
 499             wxDELETE( m_penBrush );
 500             m_penImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 501             m_penBrush = new TextureBrush(m_penImage);
 502             m_pen->SetBrush( m_penBrush );
 503             }
 504             */
 505         }
 506         break;
 507     default :
 508         if ( m_pen.GetStyle() >= wxFIRST_HATCH && m_pen.GetStyle() <= wxLAST_HATCH )
 509         {
 510             /*
 511             wxDELETE( m_penBrush );
 512             HatchStyle style = HatchStyleHorizontal;
 513             switch( pen.GetStyle() )
 514             {
 515             case wxBDIAGONAL_HATCH :
 516             style = HatchStyleBackwardDiagonal;
 517             break ;
 518             case wxCROSSDIAG_HATCH :
 519             style = HatchStyleDiagonalCross;
 520             break ;
 521             case wxFDIAGONAL_HATCH :
 522             style = HatchStyleForwardDiagonal;
 523             break ;
 524             case wxCROSS_HATCH :
 525             style = HatchStyleCross;
 526             break ;
 527             case wxHORIZONTAL_HATCH :
 528             style = HatchStyleHorizontal;
 529             break ;
 530             case wxVERTICAL_HATCH :
 531             style = HatchStyleVertical;
 532             break ;
 533
 534             }
 535             m_penBrush = new HatchBrush(style,Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
 536             pen.GetColour().Green() , pen.GetColour().Blue() ), Color.Transparent );
 537             m_pen->SetBrush( m_penBrush )
 538             */
 539         }
 540         break;
 541     }
 542 }
 543
 544 void wxCairoPenData::Apply( wxGraphicsContext* context )
 545 {
 546     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 547     cairo_set_line_width(ctext,m_width);
 548     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 549     cairo_set_line_cap(ctext,m_cap);
 550     cairo_set_line_join(ctext,m_join);
 551     cairo_set_dash(ctext,(double*)m_lengths,m_count,0.0);
 552 }
 553
 554 //-----------------------------------------------------------------------------
 555 // wxCairoBrushData implementation
 556 //-----------------------------------------------------------------------------
 557
 558 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer )
 559   : wxGraphicsObjectRefData( renderer )
 560 {
 561     Init();
 562 }
 563
 564 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush )
 565   : wxGraphicsObjectRefData(renderer)
 566 {
 567     Init();
 568
 569     m_red = brush.GetColour().Red()/255.0;
 570     m_green = brush.GetColour().Green()/255.0;
 571     m_blue = brush.GetColour().Blue()/255.0;
 572     m_alpha = brush.GetColour().Alpha()/255.0;
 573     /*
 574     if ( brush.GetStyle() == wxSOLID)
 575     {
 576     m_brush = new SolidBrush( Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 577     brush.GetColour().Green() , brush.GetColour().Blue() ) );
 578     }
 579     else if ( brush.IsHatch() )
 580     {
 581     HatchStyle style = HatchStyleHorizontal;
 582     switch( brush.GetStyle() )
 583     {
 584     case wxBDIAGONAL_HATCH :
 585     style = HatchStyleBackwardDiagonal;
 586     break ;
 587     case wxCROSSDIAG_HATCH :
 588     style = HatchStyleDiagonalCross;
 589     break ;
 590     case wxFDIAGONAL_HATCH :
 591     style = HatchStyleForwardDiagonal;
 592     break ;
 593     case wxCROSS_HATCH :
 594     style = HatchStyleCross;
 595     break ;
 596     case wxHORIZONTAL_HATCH :
 597     style = HatchStyleHorizontal;
 598     break ;
 599     case wxVERTICAL_HATCH :
 600     style = HatchStyleVertical;
 601     break ;
 602
 603     }
 604     m_brush = new HatchBrush(style,Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 605     brush.GetColour().Green() , brush.GetColour().Blue() ), Color.Transparent );
 606     }
 607     else
 608     {
 609     wxBitmap* bmp = brush.GetStipple();
 610     if ( bmp && bmp->Ok() )
 611     {
 612     wxDELETE( m_brushImage );
 613     m_brushImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 614     m_brush = new TextureBrush(m_brushImage);
 615     }
 616     }
 617     */
 618 }
 619
 620 wxCairoBrushData::~wxCairoBrushData ()
 621 {
 622     if (m_brushPattern)
 623         cairo_pattern_destroy(m_brushPattern);
 624 }
 625
 626 void wxCairoBrushData::Apply( wxGraphicsContext* context )
 627 {
 628     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 629     if ( m_brushPattern )
 630     {
 631         cairo_set_source(ctext,m_brushPattern);
 632     }
 633     else
 634     {
 635         cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 636     }
 637 }
 638
 639 void wxCairoBrushData::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 640         const wxColour&c1, const wxColour&c2 )
 641 {
 642     m_brushPattern = cairo_pattern_create_linear(x1,y1,x2,y2);
 643     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,c1.Red()/255.0,
 644         c1.Green()/255.0, c1.Blue()/255.0,c1.Alpha()/255.0);
 645     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,c2.Red()/255.0,
 646         c2.Green()/255.0, c2.Blue()/255.0,c2.Alpha()/255.0);
 647     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 648 }
 649
 650 void wxCairoBrushData::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 651         const wxColour &oColor, const wxColour &cColor )
 652 {
 653     m_brushPattern = cairo_pattern_create_radial(xo,yo,0.0,xc,yc,radius);
 654     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,oColor.Red()/255.0,
 655         oColor.Green()/255.0, oColor.Blue()/255.0,oColor.Alpha()/255.0);
 656     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,cColor.Red()/255.0,
 657         cColor.Green()/255.0, cColor.Blue()/255.0,cColor.Alpha()/255.0);
 658     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 659 }
 660
 661 void wxCairoBrushData::Init()
 662 {
 663     m_brushPattern = NULL;
 664 }
 665
 666 //-----------------------------------------------------------------------------
 667 // wxCairoFontData implementation
 668 //-----------------------------------------------------------------------------
 669
 670 wxCairoFontData::wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font,
 671                          const wxColour& col ) : wxGraphicsObjectRefData(renderer)
 672 {
 673     m_red = col.Red()/255.0;
 674     m_green = col.Green()/255.0;
 675     m_blue = col.Blue()/255.0;
 676     m_alpha = col.Alpha()/255.0;
 677
 678     m_size = font.GetPointSize();
 679     m_fontName = font.GetFaceName().mb_str(wxConvUTF8);
 680     m_slant = font.GetStyle() == wxFONTSTYLE_ITALIC ? CAIRO_FONT_SLANT_ITALIC:CAIRO_FONT_SLANT_NORMAL;
 681     m_weight = font.GetWeight() == wxFONTWEIGHT_BOLD ? CAIRO_FONT_WEIGHT_BOLD:CAIRO_FONT_WEIGHT_NORMAL;
 682 }
 683
 684 wxCairoFontData::~wxCairoFontData()
 685 {
 686 }
 687
 688 void wxCairoFontData::Apply( wxGraphicsContext* context )
 689 {
 690     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 691     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 692     cairo_select_font_face(ctext,m_fontName,m_slant,m_weight);
 693     cairo_set_font_size(ctext,m_size);
 694     // TODO UNDERLINE
 695     // TODO FIX SIZE
 696 }
 697
 698 //-----------------------------------------------------------------------------
 699 // wxCairoPathData implementation
 700 //-----------------------------------------------------------------------------
 701
 702 wxCairoPathData::wxCairoPathData( wxGraphicsRenderer* renderer, cairo_t* pathcontext)
 703     : wxGraphicsPathData(renderer)
 704 {
 705     if (pathcontext)
 706     {
 707         m_pathContext = pathcontext;
 708     }
 709     else
 710     {
 711         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 712         m_pathContext = cairo_create(surface);
 713         cairo_surface_destroy (surface);
 714     }
 715 }
 716
 717 wxCairoPathData::~wxCairoPathData()
 718 {
 719     cairo_destroy(m_pathContext);
 720 }
 721
 722 wxGraphicsObjectRefData *wxCairoPathData::Clone() const
 723 {
 724     cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 725     cairo_t* pathcontext = cairo_create(surface);
 726     cairo_surface_destroy (surface);
 727
 728     cairo_path_t* path = cairo_copy_path(m_pathContext);
 729     cairo_append_path(pathcontext, path);
 730     cairo_path_destroy(path);
 731     return new wxCairoPathData( GetRenderer() ,pathcontext);
 732 }
 733
 734
 735 void* wxCairoPathData::GetNativePath() const
 736 {
 737     return cairo_copy_path(m_pathContext) ;
 738 }
 739
 740 void wxCairoPathData::UnGetNativePath(void *p) const
 741 {
 742     cairo_path_destroy((cairo_path_t*)p);
 743 }
 744
 745 //
 746 // The Primitives
 747 //
 748
 749 void wxCairoPathData::MoveToPoint( wxDouble x , wxDouble y )
 750 {
 751     cairo_move_to(m_pathContext,x,y);
 752 }
 753
 754 void wxCairoPathData::AddLineToPoint( wxDouble x , wxDouble y )
 755 {
 756     cairo_line_to(m_pathContext,x,y);
 757 }
 758
 759 void wxCairoPathData::AddPath( const wxGraphicsPathData* path )
 760 {
 761     cairo_path_t* p = (cairo_path_t*)path->GetNativePath();
 762     cairo_append_path(m_pathContext, p);
 763     UnGetNativePath(p);
 764 }
 765
 766 void wxCairoPathData::CloseSubpath()
 767 {
 768     cairo_close_path(m_pathContext);
 769 }
 770
 771 void wxCairoPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 772 {
 773     cairo_curve_to(m_pathContext,cx1,cy1,cx2,cy2,x,y);
 774 }
 775
 776 // gets the last point of the current path, (0,0) if not yet set
 777 void wxCairoPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 778 {
 779     double dx,dy;
 780     cairo_get_current_point(m_pathContext,&dx,&dy);
 781     if (x)
 782         *x = dx;
 783     if (y)
 784         *y = dy;
 785 }
 786
 787 void wxCairoPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, double startAngle, double endAngle, bool clockwise )
 788 {
 789     // as clockwise means positive in our system (y pointing downwards)
 790     // TODO make this interpretation dependent of the
 791     // real device trans
 792     if ( clockwise||(endAngle-startAngle)>=2*M_PI)
 793         cairo_arc(m_pathContext,x,y,r,startAngle,endAngle);
 794     else
 795         cairo_arc_negative(m_pathContext,x,y,r,startAngle,endAngle);
 796 }
 797
 798 // transforms each point of this path by the matrix
 799 void wxCairoPathData::Transform( const wxGraphicsMatrixData* matrix )
 800 {
 801     // as we don't have a true path object, we have to apply the inverse
 802     // matrix to the context
 803     cairo_matrix_t m = *((cairo_matrix_t*) matrix->GetNativeMatrix());
 804     cairo_matrix_invert( &m );
 805     cairo_transform(m_pathContext,&m);
 806 }
 807
 808 // gets the bounding box enclosing all points (possibly including control points)
 809 void wxCairoPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 810 {
 811     double x1,y1,x2,y2;
 812
 813     cairo_stroke_extents( m_pathContext, &x1, &y1, &x2, &y2 );
 814     if ( x2 < x1 )
 815     {
 816         *x = x2;
 817         *w = x1-x2;
 818     }
 819     else
 820     {
 821         *x = x1;
 822         *w = x2-x1;
 823     }
 824
 825     if( y2 < y1 )
 826     {
 827         *y = y2;
 828         *h = y1-y2;
 829     }
 830     else
 831     {
 832         *y = y1;
 833         *h = y2-y1;
 834     }
 835 }
 836
 837 bool wxCairoPathData::Contains( wxDouble x, wxDouble y, int fillStyle ) const
 838 {
 839     return cairo_in_stroke( m_pathContext, x, y) != 0;
 840 }
 841
 842 //-----------------------------------------------------------------------------
 843 // wxCairoMatrixData implementation
 844 //-----------------------------------------------------------------------------
 845
 846 wxCairoMatrixData::wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix )
 847     : wxGraphicsMatrixData(renderer)
 848 {
 849     if ( matrix )
 850         m_matrix = *matrix;
 851 }
 852
 853 wxCairoMatrixData::~wxCairoMatrixData()
 854 {
 855     // nothing to do
 856 }
 857
 858 wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 859 {
 860     return new wxCairoMatrixData(GetRenderer(),&m_matrix);
 861 }
 862
 863 // concatenates the matrix
 864 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 865 {
 866     cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
 867 }
 868
 869 // sets the matrix to the respective values
 870 void wxCairoMatrixData::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 871                         wxDouble tx, wxDouble ty)
 872 {
 873     cairo_matrix_init( &m_matrix, a, b, c, d, tx, ty);
 874 }
 875
 876 // gets the component valuess of the matrix
 877 void wxCairoMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
 878                             wxDouble* d, wxDouble* tx, wxDouble* ty) const
 879 {
 880     if (a)  *a = m_matrix.xx;
 881     if (b)  *b = m_matrix.yx;
 882     if (c)  *c = m_matrix.xy;
 883     if (d)  *d = m_matrix.yy;
 884     if (tx) *tx= m_matrix.x0;
 885     if (ty) *ty= m_matrix.y0;
 886 }
 887
 888 // makes this the inverse matrix
 889 void wxCairoMatrixData::Invert()
 890 {
 891     cairo_matrix_invert( &m_matrix );
 892 }
 893
 894 // returns true if the elements of the transformation matrix are equal ?
 895 bool wxCairoMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
 896 {
 897     const cairo_matrix_t* tm = (cairo_matrix_t*) t->GetNativeMatrix();
 898     return (
 899         m_matrix.xx == tm->xx &&
 900         m_matrix.yx == tm->yx &&
 901         m_matrix.xy == tm->xy &&
 902         m_matrix.yy == tm->yy &&
 903         m_matrix.x0 == tm->x0 &&
 904         m_matrix.y0 == tm->y0 ) ;
 905 }
 906
 907 // return true if this is the identity matrix
 908 bool wxCairoMatrixData::IsIdentity() const
 909 {
 910     return ( m_matrix.xx == 1 && m_matrix.yy == 1 &&
 911         m_matrix.yx == 0 && m_matrix.xy == 0 && m_matrix.x0 == 0 && m_matrix.y0 == 0);
 912 }
 913
 914 //
 915 // transformation
 916 //
 917
 918 // add the translation to this matrix
 919 void wxCairoMatrixData::Translate( wxDouble dx , wxDouble dy )
 920 {
 921     cairo_matrix_translate( &m_matrix, dx, dy) ;
 922 }
 923
 924 // add the scale to this matrix
 925 void wxCairoMatrixData::Scale( wxDouble xScale , wxDouble yScale )
 926 {
 927     cairo_matrix_scale( &m_matrix, xScale, yScale) ;
 928 }
 929
 930 // add the rotation to this matrix (radians)
 931 void wxCairoMatrixData::Rotate( wxDouble angle )
 932 {
 933     cairo_matrix_rotate( &m_matrix, angle) ;
 934 }
 935
 936 //
 937 // apply the transforms
 938 //
 939
 940 // applies that matrix to the point
 941 void wxCairoMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
 942 {
 943     double lx = *x, ly = *y ;
 944     cairo_matrix_transform_point( &m_matrix, &lx, &ly);
 945     *x = lx;
 946     *y = ly;
 947 }
 948
 949 // applies the matrix except for translations
 950 void wxCairoMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
 951 {
 952     double lx = *dx, ly = *dy ;
 953     cairo_matrix_transform_distance( &m_matrix, &lx, &ly);
 954     *dx = lx;
 955     *dy = ly;
 956 }
 957
 958 // returns the native representation
 959 void * wxCairoMatrixData::GetNativeMatrix() const
 960 {
 961     return (void*) &m_matrix;
 962 }
 963
 964 //-----------------------------------------------------------------------------
 965 // wxCairoContext implementation
 966 //-----------------------------------------------------------------------------
 967
 968 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
 969 : wxGraphicsContext(renderer)
 970 {
 971 #ifdef __WXGTK__
 972     m_context = gdk_cairo_create( dc.m_window ) ;
 973 #endif
 974     PushState();
 975     PushState();
 976 }
 977
 978 #ifdef __WXGTK__
 979 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable )
 980 : wxGraphicsContext(renderer)
 981 {
 982     m_context = gdk_cairo_create( drawable ) ;
 983     PushState();
 984     PushState();
 985 }
 986 #endif
 987
 988 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
 989 : wxGraphicsContext(renderer)
 990 {
 991     m_context = context ;
 992     PushState();
 993     PushState();
 994 }
 995
 996 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
 997 : wxGraphicsContext(renderer)
 998 {
 999 #ifdef __WXGTK__
1000     // something along these lines (copied from dcclient)
1001
1002     GtkWidget *widget = window->m_wxwindow;
1003
1004     // Some controls don't have m_wxwindow - like wxStaticBox, but the user
1005     // code should still be able to create wxClientDCs for them, so we will
1006     // use the parent window here then.
1007     if ( !widget )
1008     {
1009         window = window->GetParent();
1010         widget = window->m_wxwindow;
1011     }
1012
1013     wxASSERT_MSG( widget, wxT("wxCairoContext needs a widget") );
1014
1015     GtkPizza *pizza = GTK_PIZZA( widget );
1016     GdkDrawable* drawable = pizza->bin_window;
1017     m_context = gdk_cairo_create( drawable ) ;
1018 #endif
1019     PushState();
1020     PushState();
1021 }
1022
1023 wxCairoContext::~wxCairoContext()
1024 {
1025     if ( m_context )
1026     {
1027         PopState();
1028         PopState();
1029         cairo_destroy(m_context);
1030     }
1031 }
1032
1033
1034 void wxCairoContext::Clip( const wxRegion& region )
1035 {
1036     // Create a path with all the rectangles in the region
1037     wxGraphicsPath path = GetRenderer()->CreatePath();
1038     wxRegionIterator ri(region);
1039     while (ri)
1040     {
1041         path.AddRectangle(ri.GetX(), ri.GetY(), ri.GetW(), ri.GetH());
1042         ri++;
1043     }
1044
1045     // Put it in the context
1046     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1047     cairo_append_path(m_context, cp);
1048
1049     // clip to that path
1050     cairo_clip(m_context);
1051     path.UnGetNativePath(cp);
1052 }
1053
1054 void wxCairoContext::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1055 {
1056     // Create a path with this rectangle
1057     wxGraphicsPath path = GetRenderer()->CreatePath();
1058     path.AddRectangle(x,y,w,h);
1059
1060     // Put it in the context
1061     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1062     cairo_append_path(m_context, cp);
1063
1064     // clip to that path
1065     cairo_clip(m_context);
1066     path.UnGetNativePath(cp);
1067 }
1068
1069 void wxCairoContext::ResetClip()
1070 {
1071     cairo_reset_clip(m_context);
1072 }
1073
1074
1075 void wxCairoContext::StrokePath( const wxGraphicsPath& path )
1076 {
1077     if ( !m_pen.IsNull() )
1078     {
1079         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1080         cairo_append_path(m_context,cp);
1081         ((wxCairoPenData*)m_pen.GetRefData())->Apply(this);
1082         cairo_stroke(m_context);
1083         path.UnGetNativePath(cp);
1084     }
1085 }
1086
1087 void wxCairoContext::FillPath( const wxGraphicsPath& path , int fillStyle )
1088 {
1089     if ( !m_brush.IsNull() )
1090     {
1091         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1092         cairo_append_path(m_context,cp);
1093         ((wxCairoBrushData*)m_brush.GetRefData())->Apply(this);
1094         cairo_set_fill_rule(m_context,fillStyle==wxODDEVEN_RULE ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
1095         cairo_fill(m_context);
1096         path.UnGetNativePath(cp);
1097     }
1098 }
1099
1100 void wxCairoContext::Rotate( wxDouble angle )
1101 {
1102     cairo_rotate(m_context,angle);
1103 }
1104
1105 void wxCairoContext::Translate( wxDouble dx , wxDouble dy )
1106 {
1107     cairo_translate(m_context,dx,dy);
1108 }
1109
1110 void wxCairoContext::Scale( wxDouble xScale , wxDouble yScale )
1111 {
1112     cairo_scale(m_context,xScale,yScale);
1113 }
1114
1115 // concatenates this transform with the current transform of this context
1116 void wxCairoContext::ConcatTransform( const wxGraphicsMatrix& matrix )
1117 {
1118     cairo_transform(m_context,(const cairo_matrix_t *) matrix.GetNativeMatrix());
1119 }
1120
1121 // sets the transform of this context
1122 void wxCairoContext::SetTransform( const wxGraphicsMatrix& matrix )
1123 {
1124     cairo_set_matrix(m_context,(const cairo_matrix_t*) matrix.GetNativeMatrix());
1125 }
1126
1127 // gets the matrix of this context
1128 wxGraphicsMatrix wxCairoContext::GetTransform() const
1129 {
1130     wxGraphicsMatrix matrix = CreateMatrix();
1131     cairo_get_matrix(m_context,(cairo_matrix_t*) matrix.GetNativeMatrix());
1132     return matrix;
1133 }
1134
1135
1136
1137 void wxCairoContext::PushState()
1138 {
1139     cairo_save(m_context);
1140 }
1141
1142 void wxCairoContext::PopState()
1143 {
1144     cairo_restore(m_context);
1145 }
1146
1147 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1148 {
1149     wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
1150
1151     cairo_surface_t* surface;
1152     int bw = bmp.GetWidth();
1153     int bh = bmp.GetHeight();
1154     wxBitmap bmpSource = bmp;  // we need a non-const instance
1155     unsigned char* buffer = new unsigned char[bw*bh*4];
1156     wxUint32* data = (wxUint32*)buffer;
1157
1158     // Create a surface object and copy the bitmap pixel data to it.  if the
1159     // image has alpha (or a mask represented as alpha) then we'll use a
1160     // different format and iterator than if it doesn't...
1161     if (bmpSource.HasAlpha() || bmpSource.GetMask())
1162     {
1163         surface = cairo_image_surface_create_for_data(
1164             buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
1165         wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1166         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1167
1168         wxAlphaPixelData::Iterator p(pixData);
1169         for (int y=0; y<bh; y++)
1170         {
1171             wxAlphaPixelData::Iterator rowStart = p;
1172             for (int x=0; x<bw; x++)
1173             {
1174                 // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
1175                 // with alpha in the upper 8 bits, then red, then green, then
1176                 // blue. The 32-bit quantities are stored native-endian.
1177                 // Pre-multiplied alpha is used.
1178                 unsigned char alpha = p.Alpha();
1179                 if (alpha == 0)
1180                     *data = 0;
1181                 else
1182                     *data = ( alpha                      << 24
1183                               | (p.Red() * alpha/255)    << 16
1184                               | (p.Green() * alpha/255)  <<  8
1185                               | (p.Blue() * alpha/255) );
1186                 ++data;
1187                 ++p;
1188             }
1189             p = rowStart;
1190             p.OffsetY(pixData, 1);
1191         }
1192     }
1193     else  // no alpha
1194     {
1195         surface = cairo_image_surface_create_for_data(
1196             buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
1197         wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1198         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1199
1200         wxNativePixelData::Iterator p(pixData);
1201         for (int y=0; y<bh; y++)
1202         {
1203             wxNativePixelData::Iterator rowStart = p;
1204             for (int x=0; x<bw; x++)
1205             {
1206                 // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
1207                 // the upper 8 bits unused. Red, Green, and Blue are stored in
1208                 // the remaining 24 bits in that order.  The 32-bit quantities
1209                 // are stored native-endian.
1210                 *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
1211                 ++data;
1212                 ++p;
1213             }
1214             p = rowStart;
1215             p.OffsetY(pixData, 1);
1216         }
1217     }
1218
1219
1220     PushState();
1221
1222     // In case we're scaling the image by using a width and height different
1223     // than the bitmap's size create a pattern transformation on the surface and
1224     // draw the transformed pattern.
1225     cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
1226     wxDouble scaleX = w / bw;
1227     wxDouble scaleY = h / bh;
1228     cairo_scale(m_context, scaleX, scaleY);
1229
1230     // prepare to draw the image
1231     cairo_translate(m_context, x, y);
1232     cairo_set_source(m_context, pattern);
1233     // use the original size here since the context is scaled already...
1234     cairo_rectangle(m_context, 0, 0, bw, bh);
1235     // fill the rectangle using the pattern
1236     cairo_fill(m_context);
1237
1238     // clean up
1239     cairo_pattern_destroy(pattern);
1240     cairo_surface_destroy(surface);
1241     delete [] buffer;
1242     PopState();
1243 }
1244
1245 void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1246 {
1247     // An icon is a bitmap on wxGTK, so do this the easy way.  When we want to
1248     // start using the Cairo backend on other platforms then we may need to
1249     // fiddle with this...
1250     DrawBitmap(icon, x, y, w, h);
1251 }
1252
1253
1254 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
1255 {
1256     if ( m_font.IsNull() || str.empty())
1257         return;
1258
1259     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1260
1261     // Cairo's x,y for drawing text is at the baseline, so we need to adjust
1262     // the position we move to by the ascent.
1263     cairo_font_extents_t fe;
1264     cairo_font_extents(m_context, &fe);
1265     cairo_move_to(m_context, x, y+fe.ascent);
1266
1267     const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1268     cairo_show_text(m_context,buf);
1269 }
1270
1271 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
1272                                     wxDouble *descent, wxDouble *externalLeading ) const
1273 {
1274     if ( m_font.IsNull() || str.empty())
1275         return;
1276
1277     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
1278
1279     if (width)
1280     {
1281         const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1282         cairo_text_extents_t te;
1283         cairo_text_extents(m_context, buf, &te);
1284         *width = te.width;
1285     }
1286
1287     if (height || descent || externalLeading)
1288     {
1289         cairo_font_extents_t fe;
1290         cairo_font_extents(m_context, &fe);
1291
1292         if (height)
1293             *height = fe.height;
1294         if ( descent )
1295             *descent = fe.descent;
1296         if ( externalLeading )
1297             *externalLeading = wxMax(0, fe.height - (fe.ascent + fe.descent));
1298     }
1299 }
1300
1301 void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
1302 {
1303     widths.Empty();
1304     widths.Add(0, text.length());
1305
1306     if (text.empty())
1307         return;
1308
1309     // TODO
1310 }
1311
1312 void * wxCairoContext::GetNativeContext()
1313 {
1314     return m_context;
1315 }
1316
1317 //-----------------------------------------------------------------------------
1318 // wxCairoRenderer declaration
1319 //-----------------------------------------------------------------------------
1320
1321 class WXDLLIMPEXP_CORE wxCairoRenderer : public wxGraphicsRenderer
1322 {
1323 public :
1324     wxCairoRenderer() {}
1325
1326     virtual ~wxCairoRenderer() {}
1327
1328     // Context
1329
1330     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);
1331
1332 #ifdef __WXMSW__
1333     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
1334 #endif
1335
1336     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
1337
1338     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
1339
1340     virtual wxGraphicsContext * CreateContext( wxWindow* window );
1341
1342     virtual wxGraphicsContext * CreateMeasuringContext();
1343
1344     // Path
1345
1346     virtual wxGraphicsPath CreatePath();
1347
1348     // Matrix
1349
1350     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
1351         wxDouble tx=0.0, wxDouble ty=0.0);
1352
1353
1354     virtual wxGraphicsPen CreatePen(const wxPen& pen) ;
1355
1356     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
1357
1358     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1359     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1360         const wxColour&c1, const wxColour&c2) ;
1361
1362     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1363     // with radius r and color cColor
1364     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1365         const wxColour &oColor, const wxColour &cColor) ;
1366
1367     // sets the font
1368     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
1369
1370 private :
1371     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
1372 } ;
1373
1374 //-----------------------------------------------------------------------------
1375 // wxCairoRenderer implementation
1376 //-----------------------------------------------------------------------------
1377
1378 IMPLEMENT_DYNAMIC_CLASS(wxCairoRenderer,wxGraphicsRenderer)
1379
1380 static wxCairoRenderer gs_cairoGraphicsRenderer;
1381
1382 #ifdef __WXGTK__
1383 wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
1384 {
1385     return &gs_cairoGraphicsRenderer;
1386 }
1387 #endif
1388
1389 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
1390 {
1391     return new wxCairoContext(this,dc);
1392 }
1393
1394 #ifdef __WXMSW__
1395 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxMemoryDC& dc)
1396 {
1397     return NULL;
1398 }
1399 #endif
1400
1401 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeContext( void * context )
1402 {
1403     return new wxCairoContext(this,(cairo_t*)context);
1404 }
1405
1406
1407 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeWindow( void * window )
1408 {
1409 #ifdef __WXGTK__
1410     return new wxCairoContext(this,(GdkDrawable*)window);
1411 #else
1412     return NULL;
1413 #endif
1414 }
1415
1416 wxGraphicsContext * wxCairoRenderer::CreateMeasuringContext()
1417 {
1418     return NULL;
1419     // TODO
1420 }
1421
1422 wxGraphicsContext * wxCairoRenderer::CreateContext( wxWindow* window )
1423 {
1424     return new wxCairoContext(this, window );
1425 }
1426
1427 // Path
1428
1429 wxGraphicsPath wxCairoRenderer::CreatePath()
1430 {
1431     wxGraphicsPath path;
1432     path.SetRefData( new wxCairoPathData(this) );
1433     return path;
1434 }
1435
1436
1437 // Matrix
1438
1439 wxGraphicsMatrix wxCairoRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
1440                                                 wxDouble tx, wxDouble ty)
1441
1442 {
1443     wxGraphicsMatrix m;
1444     wxCairoMatrixData* data = new wxCairoMatrixData( this );
1445     data->Set( a,b,c,d,tx,ty ) ;
1446     m.SetRefData(data);
1447     return m;
1448 }
1449
1450 wxGraphicsPen wxCairoRenderer::CreatePen(const wxPen& pen)
1451 {
1452     if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
1453         return wxNullGraphicsPen;
1454     else
1455     {
1456         wxGraphicsPen p;
1457         p.SetRefData(new wxCairoPenData( this, pen ));
1458         return p;
1459     }
1460 }
1461
1462 wxGraphicsBrush wxCairoRenderer::CreateBrush(const wxBrush& brush )
1463 {
1464     if ( !brush.Ok() || brush.GetStyle() == wxTRANSPARENT )
1465         return wxNullGraphicsBrush;
1466     else
1467     {
1468         wxGraphicsBrush p;
1469         p.SetRefData(new wxCairoBrushData( this, brush ));
1470         return p;
1471     }
1472 }
1473
1474 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1475 wxGraphicsBrush wxCairoRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1476                                                                       const wxColour&c1, const wxColour&c2)
1477 {
1478     wxGraphicsBrush p;
1479     wxCairoBrushData* d = new wxCairoBrushData( this );
1480     d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
1481     p.SetRefData(d);
1482     return p;
1483 }
1484
1485 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1486 // with radius r and color cColor
1487 wxGraphicsBrush wxCairoRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1488                                                                       const wxColour &oColor, const wxColour &cColor)
1489 {
1490     wxGraphicsBrush p;
1491     wxCairoBrushData* d = new wxCairoBrushData( this );
1492     d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
1493     p.SetRefData(d);
1494     return p;
1495 }
1496
1497 // sets the font
1498 wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour &col )
1499 {
1500     if ( font.Ok() )
1501     {
1502         wxGraphicsFont p;
1503         p.SetRefData(new wxCairoFontData( this , font, col ));
1504         return p;
1505     }
1506     else
1507         return wxNullGraphicsFont;
1508 }
1509
1510 #endif  // wxUSE_GRAPHICS_CONTEXT