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 #ifdef __BORLANDC__
  15 #pragma hdrstop
  16 #endif
  17
  18 #if wxUSE_GRAPHICS_CONTEXT
  19
  20 #include "wx/dc.h"
  21
  22 #ifndef WX_PRECOMP
  23 #include "wx/image.h"
  24 #include "wx/window.h"
  25 #include "wx/dc.h"
  26 #include "wx/utils.h"
  27 #include "wx/dialog.h"
  28 #include "wx/app.h"
  29 #include "wx/bitmap.h"
  30 #include "wx/dcmemory.h"
  31 #include "wx/log.h"
  32 #include "wx/icon.h"
  33 #include "wx/dcprint.h"
  34 #include "wx/module.h"
  35 #endif
  36
  37 #include "wx/graphics.h"
  38 #include "wx/rawbmp.h"
  39
  40 #include <vector>
  41
  42 using namespace std;
  43
  44 //-----------------------------------------------------------------------------
  45 // constants
  46 //-----------------------------------------------------------------------------
  47
  48 const double RAD2DEG = 180.0 / M_PI;
  49
  50 //-----------------------------------------------------------------------------
  51 // Local functions
  52 //-----------------------------------------------------------------------------
  53
  54 static inline double dmin(double a, double b)
  55 {
  56     return a < b ? a : b;
  57 }
  58 static inline double dmax(double a, double b)
  59 {
  60     return a > b ? a : b;
  61 }
  62
  63 static inline double DegToRad(double deg)
  64 {
  65     return (deg * M_PI) / 180.0;
  66 }
  67 static inline double RadToDeg(double deg)
  68 {
  69     return (deg * 180.0) / M_PI;
  70 }
  71
  72 //-----------------------------------------------------------------------------
  73 // device context implementation
  74 //
  75 // more and more of the dc functionality should be implemented by calling
  76 // the appropricate wxCairoContext, but we will have to do that step by step
  77 // also coordinate conversions should be moved to native matrix ops
  78 //-----------------------------------------------------------------------------
  79
  80 // we always stock two context states, one at entry, to be able to preserve the
  81 // state we were called with, the other one after changing to HI Graphics orientation
  82 // (this one is used for getting back clippings etc)
  83
  84 //-----------------------------------------------------------------------------
  85 // wxGraphicsPath implementation
  86 //-----------------------------------------------------------------------------
  87
  88 // TODO remove this dependency (gdiplus needs the macros)
  89
  90 #ifndef max
  91 #define max(a,b)            (((a) > (b)) ? (a) : (b))
  92 #endif
  93
  94 #ifndef min
  95 #define min(a,b)            (((a) < (b)) ? (a) : (b))
  96 #endif
  97
  98 #include <cairo.h>
  99 #ifdef __WXGTK__
 100 #include <gtk/gtk.h>
 101 #include "wx/fontutil.h"
 102 #endif
 103
 104 #ifdef __WXMSW__
 105 #include <cairo-win32.h>
 106 #endif
 107
 108 #ifdef __WXMAC__
 109 #include "wx/mac/private.h"
 110 #include <cairo-quartz.h>
 111 #include <cairo-atsui.h>
 112 #endif
 113
 114 class WXDLLIMPEXP_CORE wxCairoPathData : public wxGraphicsPathData
 115 {
 116 public :
 117     wxCairoPathData(wxGraphicsRenderer* renderer, cairo_t* path = NULL);
 118     ~wxCairoPathData();
 119
 120     virtual wxGraphicsObjectRefData *Clone() const;
 121
 122     //
 123     // These are the path primitives from which everything else can be constructed
 124     //
 125
 126     // begins a new subpath at (x,y)
 127     virtual void MoveToPoint( wxDouble x, wxDouble y );
 128
 129     // adds a straight line from the current point to (x,y)
 130     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 131
 132     // adds a cubic Bezier curve from the current point, using two control points and an end point
 133     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );
 134
 135
 136     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 137     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) ;
 138
 139     // gets the last point of the current path, (0,0) if not yet set
 140     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 141
 142     // adds another path
 143     virtual void AddPath( const wxGraphicsPathData* path );
 144
 145     // closes the current sub-path
 146     virtual void CloseSubpath();
 147
 148     //
 149     // These are convenience functions which - if not available natively will be assembled
 150     // using the primitives from above
 151     //
 152
 153     /*
 154
 155     // appends a rectangle as a new closed subpath
 156     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) ;
 157     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 158     virtual void AddEllipsis( wxDouble x, wxDouble y, wxDouble w , wxDouble h ) ;
 159
 160     // 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)
 161     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )  ;
 162     */
 163
 164     // returns the native path
 165     virtual void * GetNativePath() const ;
 166
 167     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 168     virtual void UnGetNativePath(void *p) const;
 169
 170     // transforms each point of this path by the matrix
 171     virtual void Transform( const wxGraphicsMatrixData* matrix ) ;
 172
 173     // gets the bounding box enclosing all points (possibly including control points)
 174     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const;
 175
 176     virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxWINDING_RULE) const;
 177
 178 private :
 179     cairo_t* m_pathContext;
 180 };
 181
 182 class WXDLLIMPEXP_CORE wxCairoMatrixData : public wxGraphicsMatrixData
 183 {
 184 public :
 185     wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix = NULL ) ;
 186     virtual ~wxCairoMatrixData() ;
 187
 188     virtual wxGraphicsObjectRefData *Clone() const ;
 189
 190     // concatenates the matrix
 191     virtual void Concat( const wxGraphicsMatrixData *t );
 192
 193     // sets the matrix to the respective values
 194     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 195         wxDouble tx=0.0, wxDouble ty=0.0);
 196
 197     // gets the component valuess of the matrix
 198     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 199                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 200
 201     // makes this the inverse matrix
 202     virtual void Invert();
 203
 204     // returns true if the elements of the transformation matrix are equal ?
 205     virtual bool IsEqual( const wxGraphicsMatrixData* t) const ;
 206
 207     // return true if this is the identity matrix
 208     virtual bool IsIdentity() const;
 209
 210     //
 211     // transformation
 212     //
 213
 214     // add the translation to this matrix
 215     virtual void Translate( wxDouble dx , wxDouble dy );
 216
 217     // add the scale to this matrix
 218     virtual void Scale( wxDouble xScale , wxDouble yScale );
 219
 220     // add the rotation to this matrix (radians)
 221     virtual void Rotate( wxDouble angle );
 222
 223     //
 224     // apply the transforms
 225     //
 226
 227     // applies that matrix to the point
 228     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 229
 230     // applies the matrix except for translations
 231     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 232
 233     // returns the native representation
 234     virtual void * GetNativeMatrix() const;
 235 private:
 236     cairo_matrix_t m_matrix ;
 237 } ;
 238
 239 class WXDLLIMPEXP_CORE wxCairoPenData : public wxGraphicsObjectRefData
 240 {
 241 public:
 242     wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen );
 243     ~wxCairoPenData();
 244
 245     void Init();
 246
 247     virtual void Apply( wxGraphicsContext* context );
 248     virtual wxDouble GetWidth() { return m_width; }
 249
 250 private :
 251     double m_width;
 252
 253     double m_red;
 254     double m_green;
 255     double m_blue;
 256     double m_alpha;
 257
 258     cairo_line_cap_t m_cap;
 259     cairo_line_join_t m_join;
 260
 261     int m_count;
 262     const double *m_lengths;
 263     double *m_userLengths;
 264
 265     wxPen m_pen;
 266 };
 267
 268 class WXDLLIMPEXP_CORE wxCairoBrushData : public wxGraphicsObjectRefData
 269 {
 270 public:
 271     wxCairoBrushData( wxGraphicsRenderer* renderer );
 272     wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush );
 273     ~wxCairoBrushData ();
 274
 275     virtual void Apply( wxGraphicsContext* context );
 276     void CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 277         const wxColour&c1, const wxColour&c2 );
 278     void CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 279         const wxColour &oColor, const wxColour &cColor );
 280
 281 protected:
 282     virtual void Init();
 283
 284 private :
 285     double m_red;
 286     double m_green;
 287     double m_blue;
 288     double m_alpha;
 289
 290     cairo_pattern_t* m_brushPattern;
 291 };
 292
 293 class wxCairoFontData : public wxGraphicsObjectRefData
 294 {
 295 public:
 296     wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font, const wxColour& col );
 297     ~wxCairoFontData();
 298
 299     virtual void Apply( wxGraphicsContext* context );
 300 #ifdef __WXGTK__
 301     const PangoFontDescription* GetFont() const { return m_font; }
 302 #endif
 303 private :
 304     double m_size;
 305     double m_red;
 306     double m_green;
 307     double m_blue;
 308     double m_alpha;
 309 #ifdef __WXMAC__
 310     cairo_font_face_t *m_font;
 311 #elif defined(__WXGTK__)
 312     PangoFontDescription* m_font;
 313 #else
 314     wxCharBuffer m_fontName;
 315     cairo_font_slant_t m_slant;
 316     cairo_font_weight_t m_weight;
 317 #endif
 318 };
 319
 320 class WXDLLIMPEXP_CORE wxCairoContext : public wxGraphicsContext
 321 {
 322     DECLARE_NO_COPY_CLASS(wxCairoContext)
 323
 324 public:
 325     wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc );
 326 #ifdef __WXGTK__
 327     wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable );
 328 #endif
 329     wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context );
 330     wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window);
 331     wxCairoContext();
 332     virtual ~wxCairoContext();
 333
 334     virtual bool ShouldOffset() const
 335     {
 336         int penwidth = 0 ;
 337         if ( !m_pen.IsNull() )
 338         {
 339             penwidth = (int)((wxCairoPenData*)m_pen.GetRefData())->GetWidth();
 340             if ( penwidth == 0 )
 341                 penwidth = 1;
 342         }
 343         return ( penwidth % 2 ) == 1;
 344     }
 345
 346     virtual void Clip( const wxRegion &region );
 347
 348     // clips drawings to the rect
 349     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 350
 351     // resets the clipping to original extent
 352     virtual void ResetClip();
 353
 354     virtual void * GetNativeContext();
 355
 356     virtual void StrokePath( const wxGraphicsPath& p );
 357     virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxWINDING_RULE );
 358
 359     virtual void Translate( wxDouble dx , wxDouble dy );
 360     virtual void Scale( wxDouble xScale , wxDouble yScale );
 361     virtual void Rotate( wxDouble angle );
 362
 363     // concatenates this transform with the current transform of this context
 364     virtual void ConcatTransform( const wxGraphicsMatrix& matrix );
 365
 366     // sets the transform of this context
 367     virtual void SetTransform( const wxGraphicsMatrix& matrix );
 368
 369     // gets the matrix of this context
 370     virtual wxGraphicsMatrix GetTransform() const;
 371
 372     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 373     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 374     virtual void PushState();
 375     virtual void PopState();
 376
 377     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y);
 378     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
 379                                 wxDouble *descent, wxDouble *externalLeading ) const;
 380     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
 381
 382 private:
 383     void Init(cairo_t *context);
 384
 385     cairo_t* m_context;
 386 };
 387
 388 //-----------------------------------------------------------------------------
 389 // wxCairoPenData implementation
 390 //-----------------------------------------------------------------------------
 391
 392 wxCairoPenData::~wxCairoPenData()
 393 {
 394     delete[] m_userLengths;
 395 }
 396
 397 void wxCairoPenData::Init()
 398 {
 399     m_lengths = NULL;
 400     m_userLengths = NULL;
 401     m_width = 0;
 402     m_count = 0;
 403 }
 404
 405 wxCairoPenData::wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen )
 406 : wxGraphicsObjectRefData(renderer)
 407 {
 408     Init();
 409     m_pen = pen;
 410     m_width = m_pen.GetWidth();
 411     if (m_width <= 0.0)
 412         m_width = 0.1;
 413
 414     m_red = m_pen.GetColour().Red()/255.0;
 415     m_green = m_pen.GetColour().Green()/255.0;
 416     m_blue = m_pen.GetColour().Blue()/255.0;
 417     m_alpha = m_pen.GetColour().Alpha()/255.0;
 418
 419     switch ( m_pen.GetCap() )
 420     {
 421     case wxCAP_ROUND :
 422         m_cap = CAIRO_LINE_CAP_ROUND;
 423         break;
 424
 425     case wxCAP_PROJECTING :
 426         m_cap = CAIRO_LINE_CAP_SQUARE;
 427         break;
 428
 429     case wxCAP_BUTT :
 430         m_cap = CAIRO_LINE_CAP_BUTT;
 431         break;
 432
 433     default :
 434         m_cap = CAIRO_LINE_CAP_BUTT;
 435         break;
 436     }
 437
 438     switch ( m_pen.GetJoin() )
 439     {
 440     case wxJOIN_BEVEL :
 441         m_join = CAIRO_LINE_JOIN_BEVEL;
 442         break;
 443
 444     case wxJOIN_MITER :
 445         m_join = CAIRO_LINE_JOIN_MITER;
 446         break;
 447
 448     case wxJOIN_ROUND :
 449         m_join = CAIRO_LINE_JOIN_ROUND;
 450         break;
 451
 452     default :
 453         m_join = CAIRO_LINE_JOIN_MITER;
 454         break;
 455     }
 456
 457     const double dashUnit = m_width < 1.0 ? 1.0 : m_width;
 458     const double dotted[] =
 459     {
 460         dashUnit , dashUnit + 2.0
 461     };
 462     static const double short_dashed[] =
 463     {
 464         9.0 , 6.0
 465     };
 466     static const double dashed[] =
 467     {
 468         19.0 , 9.0
 469     };
 470     static const double dotted_dashed[] =
 471     {
 472         9.0 , 6.0 , 3.0 , 3.0
 473     };
 474
 475     switch ( m_pen.GetStyle() )
 476     {
 477     case wxSOLID :
 478         break;
 479
 480     case wxDOT :
 481         m_count = WXSIZEOF(dotted);
 482         m_userLengths = new double[ m_count ] ;
 483         memcpy( m_userLengths, dotted, sizeof(dotted) );
 484         m_lengths = m_userLengths;
 485         break;
 486
 487     case wxLONG_DASH :
 488         m_lengths = dashed ;
 489         m_count = WXSIZEOF(dashed);
 490         break;
 491
 492     case wxSHORT_DASH :
 493         m_lengths = short_dashed ;
 494         m_count = WXSIZEOF(short_dashed);
 495         break;
 496
 497     case wxDOT_DASH :
 498         m_lengths = dotted_dashed ;
 499         m_count = WXSIZEOF(dotted_dashed);
 500         break;
 501
 502     case wxUSER_DASH :
 503         {
 504             wxDash *wxdashes ;
 505             m_count = m_pen.GetDashes( &wxdashes ) ;
 506             if ((wxdashes != NULL) && (m_count > 0))
 507             {
 508                 m_userLengths = new double[m_count] ;
 509                 for ( int i = 0 ; i < m_count ; ++i )
 510                 {
 511                     m_userLengths[i] = wxdashes[i] * dashUnit ;
 512
 513                     if ( i % 2 == 1 && m_userLengths[i] < dashUnit + 2.0 )
 514                         m_userLengths[i] = dashUnit + 2.0 ;
 515                     else if ( i % 2 == 0 && m_userLengths[i] < dashUnit )
 516                         m_userLengths[i] = dashUnit ;
 517                 }
 518             }
 519             m_lengths = m_userLengths ;
 520         }
 521         break;
 522     case wxSTIPPLE :
 523         {
 524             /*
 525             wxBitmap* bmp = pen.GetStipple();
 526             if ( bmp && bmp->Ok() )
 527             {
 528             wxDELETE( m_penImage );
 529             wxDELETE( m_penBrush );
 530             m_penImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 531             m_penBrush = new TextureBrush(m_penImage);
 532             m_pen->SetBrush( m_penBrush );
 533             }
 534             */
 535         }
 536         break;
 537     default :
 538         if ( m_pen.GetStyle() >= wxFIRST_HATCH && m_pen.GetStyle() <= wxLAST_HATCH )
 539         {
 540             /*
 541             wxDELETE( m_penBrush );
 542             HatchStyle style = HatchStyleHorizontal;
 543             switch( pen.GetStyle() )
 544             {
 545             case wxBDIAGONAL_HATCH :
 546             style = HatchStyleBackwardDiagonal;
 547             break ;
 548             case wxCROSSDIAG_HATCH :
 549             style = HatchStyleDiagonalCross;
 550             break ;
 551             case wxFDIAGONAL_HATCH :
 552             style = HatchStyleForwardDiagonal;
 553             break ;
 554             case wxCROSS_HATCH :
 555             style = HatchStyleCross;
 556             break ;
 557             case wxHORIZONTAL_HATCH :
 558             style = HatchStyleHorizontal;
 559             break ;
 560             case wxVERTICAL_HATCH :
 561             style = HatchStyleVertical;
 562             break ;
 563
 564             }
 565             m_penBrush = new HatchBrush(style,Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
 566             pen.GetColour().Green() , pen.GetColour().Blue() ), Color.Transparent );
 567             m_pen->SetBrush( m_penBrush )
 568             */
 569         }
 570         break;
 571     }
 572 }
 573
 574 void wxCairoPenData::Apply( wxGraphicsContext* context )
 575 {
 576     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 577     cairo_set_line_width(ctext,m_width);
 578     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 579     cairo_set_line_cap(ctext,m_cap);
 580     cairo_set_line_join(ctext,m_join);
 581     cairo_set_dash(ctext,(double*)m_lengths,m_count,0.0);
 582 }
 583
 584 //-----------------------------------------------------------------------------
 585 // wxCairoBrushData implementation
 586 //-----------------------------------------------------------------------------
 587
 588 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer )
 589   : wxGraphicsObjectRefData( renderer )
 590 {
 591     Init();
 592 }
 593
 594 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush )
 595   : wxGraphicsObjectRefData(renderer)
 596 {
 597     Init();
 598
 599     m_red = brush.GetColour().Red()/255.0;
 600     m_green = brush.GetColour().Green()/255.0;
 601     m_blue = brush.GetColour().Blue()/255.0;
 602     m_alpha = brush.GetColour().Alpha()/255.0;
 603     /*
 604     if ( brush.GetStyle() == wxSOLID)
 605     {
 606     m_brush = new SolidBrush( Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 607     brush.GetColour().Green() , brush.GetColour().Blue() ) );
 608     }
 609     else if ( brush.IsHatch() )
 610     {
 611     HatchStyle style = HatchStyleHorizontal;
 612     switch( brush.GetStyle() )
 613     {
 614     case wxBDIAGONAL_HATCH :
 615     style = HatchStyleBackwardDiagonal;
 616     break ;
 617     case wxCROSSDIAG_HATCH :
 618     style = HatchStyleDiagonalCross;
 619     break ;
 620     case wxFDIAGONAL_HATCH :
 621     style = HatchStyleForwardDiagonal;
 622     break ;
 623     case wxCROSS_HATCH :
 624     style = HatchStyleCross;
 625     break ;
 626     case wxHORIZONTAL_HATCH :
 627     style = HatchStyleHorizontal;
 628     break ;
 629     case wxVERTICAL_HATCH :
 630     style = HatchStyleVertical;
 631     break ;
 632
 633     }
 634     m_brush = new HatchBrush(style,Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 635     brush.GetColour().Green() , brush.GetColour().Blue() ), Color.Transparent );
 636     }
 637     else
 638     {
 639     wxBitmap* bmp = brush.GetStipple();
 640     if ( bmp && bmp->Ok() )
 641     {
 642     wxDELETE( m_brushImage );
 643     m_brushImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 644     m_brush = new TextureBrush(m_brushImage);
 645     }
 646     }
 647     */
 648 }
 649
 650 wxCairoBrushData::~wxCairoBrushData ()
 651 {
 652     if (m_brushPattern)
 653         cairo_pattern_destroy(m_brushPattern);
 654 }
 655
 656 void wxCairoBrushData::Apply( wxGraphicsContext* context )
 657 {
 658     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 659     if ( m_brushPattern )
 660     {
 661         cairo_set_source(ctext,m_brushPattern);
 662     }
 663     else
 664     {
 665         cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 666     }
 667 }
 668
 669 void wxCairoBrushData::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 670         const wxColour&c1, const wxColour&c2 )
 671 {
 672     m_brushPattern = cairo_pattern_create_linear(x1,y1,x2,y2);
 673     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,c1.Red()/255.0,
 674         c1.Green()/255.0, c1.Blue()/255.0,c1.Alpha()/255.0);
 675     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,c2.Red()/255.0,
 676         c2.Green()/255.0, c2.Blue()/255.0,c2.Alpha()/255.0);
 677     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 678 }
 679
 680 void wxCairoBrushData::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 681         const wxColour &oColor, const wxColour &cColor )
 682 {
 683     m_brushPattern = cairo_pattern_create_radial(xo,yo,0.0,xc,yc,radius);
 684     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,oColor.Red()/255.0,
 685         oColor.Green()/255.0, oColor.Blue()/255.0,oColor.Alpha()/255.0);
 686     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,cColor.Red()/255.0,
 687         cColor.Green()/255.0, cColor.Blue()/255.0,cColor.Alpha()/255.0);
 688     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 689 }
 690
 691 void wxCairoBrushData::Init()
 692 {
 693     m_brushPattern = NULL;
 694 }
 695
 696 //-----------------------------------------------------------------------------
 697 // wxCairoFontData implementation
 698 //-----------------------------------------------------------------------------
 699
 700 wxCairoFontData::wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font,
 701                          const wxColour& col ) : wxGraphicsObjectRefData(renderer)
 702 {
 703     m_red = col.Red()/255.0;
 704     m_green = col.Green()/255.0;
 705     m_blue = col.Blue()/255.0;
 706     m_alpha = col.Alpha()/255.0;
 707     m_size = font.GetPointSize();
 708
 709 #ifdef __WXMAC__
 710     m_font = cairo_atsui_font_face_create_for_atsu_font_id( font.MacGetATSUFontID() );
 711 #elif defined(__WXGTK__)
 712     m_font = pango_font_description_copy( font.GetNativeFontInfo()->description );
 713 #else
 714     m_fontName = font.GetFaceName().mb_str(wxConvUTF8);
 715     m_slant = font.GetStyle() == wxFONTSTYLE_ITALIC ? CAIRO_FONT_SLANT_ITALIC:CAIRO_FONT_SLANT_NORMAL;
 716     m_weight = font.GetWeight() == wxFONTWEIGHT_BOLD ? CAIRO_FONT_WEIGHT_BOLD:CAIRO_FONT_WEIGHT_NORMAL;
 717 #endif
 718 }
 719
 720 wxCairoFontData::~wxCairoFontData()
 721 {
 722 #ifdef __WXMAC__
 723     cairo_font_face_destroy( m_font );
 724 #elif defined(__WXGTK__)
 725     pango_font_description_free( m_font );
 726 #else
 727 #endif
 728 }
 729
 730 void wxCairoFontData::Apply( wxGraphicsContext* context )
 731 {
 732     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 733     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 734 #ifdef __WXGTK__
 735     // the rest is done using Pango layouts
 736 #elif defined(__WXMAC__)
 737     cairo_set_font_face(ctext, m_font);
 738     cairo_set_font_size(ctext, m_size );
 739 #else
 740     cairo_select_font_face(ctext, m_fontName, m_slant, m_weights );
 741     cairo_set_font_size(ctext, m_size );
 742 #endif
 743 }
 744
 745 //-----------------------------------------------------------------------------
 746 // wxCairoPathData implementation
 747 //-----------------------------------------------------------------------------
 748
 749 wxCairoPathData::wxCairoPathData( wxGraphicsRenderer* renderer, cairo_t* pathcontext)
 750     : wxGraphicsPathData(renderer)
 751 {
 752     if (pathcontext)
 753     {
 754         m_pathContext = pathcontext;
 755     }
 756     else
 757     {
 758         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 759         m_pathContext = cairo_create(surface);
 760         cairo_surface_destroy (surface);
 761     }
 762 }
 763
 764 wxCairoPathData::~wxCairoPathData()
 765 {
 766     cairo_destroy(m_pathContext);
 767 }
 768
 769 wxGraphicsObjectRefData *wxCairoPathData::Clone() const
 770 {
 771     cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 772     cairo_t* pathcontext = cairo_create(surface);
 773     cairo_surface_destroy (surface);
 774
 775     cairo_path_t* path = cairo_copy_path(m_pathContext);
 776     cairo_append_path(pathcontext, path);
 777     cairo_path_destroy(path);
 778     return new wxCairoPathData( GetRenderer() ,pathcontext);
 779 }
 780
 781
 782 void* wxCairoPathData::GetNativePath() const
 783 {
 784     return cairo_copy_path(m_pathContext) ;
 785 }
 786
 787 void wxCairoPathData::UnGetNativePath(void *p) const
 788 {
 789     cairo_path_destroy((cairo_path_t*)p);
 790 }
 791
 792 //
 793 // The Primitives
 794 //
 795
 796 void wxCairoPathData::MoveToPoint( wxDouble x , wxDouble y )
 797 {
 798     cairo_move_to(m_pathContext,x,y);
 799 }
 800
 801 void wxCairoPathData::AddLineToPoint( wxDouble x , wxDouble y )
 802 {
 803     cairo_line_to(m_pathContext,x,y);
 804 }
 805
 806 void wxCairoPathData::AddPath( const wxGraphicsPathData* path )
 807 {
 808     cairo_path_t* p = (cairo_path_t*)path->GetNativePath();
 809     cairo_append_path(m_pathContext, p);
 810     UnGetNativePath(p);
 811 }
 812
 813 void wxCairoPathData::CloseSubpath()
 814 {
 815     cairo_close_path(m_pathContext);
 816 }
 817
 818 void wxCairoPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 819 {
 820     cairo_curve_to(m_pathContext,cx1,cy1,cx2,cy2,x,y);
 821 }
 822
 823 // gets the last point of the current path, (0,0) if not yet set
 824 void wxCairoPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 825 {
 826     double dx,dy;
 827     cairo_get_current_point(m_pathContext,&dx,&dy);
 828     if (x)
 829         *x = dx;
 830     if (y)
 831         *y = dy;
 832 }
 833
 834 void wxCairoPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, double startAngle, double endAngle, bool clockwise )
 835 {
 836     // as clockwise means positive in our system (y pointing downwards)
 837     // TODO make this interpretation dependent of the
 838     // real device trans
 839     if ( clockwise||(endAngle-startAngle)>=2*M_PI)
 840         cairo_arc(m_pathContext,x,y,r,startAngle,endAngle);
 841     else
 842         cairo_arc_negative(m_pathContext,x,y,r,startAngle,endAngle);
 843 }
 844
 845 // transforms each point of this path by the matrix
 846 void wxCairoPathData::Transform( const wxGraphicsMatrixData* matrix )
 847 {
 848     // as we don't have a true path object, we have to apply the inverse
 849     // matrix to the context
 850     cairo_matrix_t m = *((cairo_matrix_t*) matrix->GetNativeMatrix());
 851     cairo_matrix_invert( &m );
 852     cairo_transform(m_pathContext,&m);
 853 }
 854
 855 // gets the bounding box enclosing all points (possibly including control points)
 856 void wxCairoPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 857 {
 858     double x1,y1,x2,y2;
 859
 860     cairo_stroke_extents( m_pathContext, &x1, &y1, &x2, &y2 );
 861     if ( x2 < x1 )
 862     {
 863         *x = x2;
 864         *w = x1-x2;
 865     }
 866     else
 867     {
 868         *x = x1;
 869         *w = x2-x1;
 870     }
 871
 872     if( y2 < y1 )
 873     {
 874         *y = y2;
 875         *h = y1-y2;
 876     }
 877     else
 878     {
 879         *y = y1;
 880         *h = y2-y1;
 881     }
 882 }
 883
 884 bool wxCairoPathData::Contains( wxDouble x, wxDouble y, int WXUNUSED(fillStyle) ) const
 885 {
 886     return cairo_in_stroke( m_pathContext, x, y) != 0;
 887 }
 888
 889 //-----------------------------------------------------------------------------
 890 // wxCairoMatrixData implementation
 891 //-----------------------------------------------------------------------------
 892
 893 wxCairoMatrixData::wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix )
 894     : wxGraphicsMatrixData(renderer)
 895 {
 896     if ( matrix )
 897         m_matrix = *matrix;
 898 }
 899
 900 wxCairoMatrixData::~wxCairoMatrixData()
 901 {
 902     // nothing to do
 903 }
 904
 905 wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 906 {
 907     return new wxCairoMatrixData(GetRenderer(),&m_matrix);
 908 }
 909
 910 // concatenates the matrix
 911 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 912 {
 913     cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
 914 }
 915
 916 // sets the matrix to the respective values
 917 void wxCairoMatrixData::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 918                         wxDouble tx, wxDouble ty)
 919 {
 920     cairo_matrix_init( &m_matrix, a, b, c, d, tx, ty);
 921 }
 922
 923 // gets the component valuess of the matrix
 924 void wxCairoMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
 925                             wxDouble* d, wxDouble* tx, wxDouble* ty) const
 926 {
 927     if (a)  *a = m_matrix.xx;
 928     if (b)  *b = m_matrix.yx;
 929     if (c)  *c = m_matrix.xy;
 930     if (d)  *d = m_matrix.yy;
 931     if (tx) *tx= m_matrix.x0;
 932     if (ty) *ty= m_matrix.y0;
 933 }
 934
 935 // makes this the inverse matrix
 936 void wxCairoMatrixData::Invert()
 937 {
 938     cairo_matrix_invert( &m_matrix );
 939 }
 940
 941 // returns true if the elements of the transformation matrix are equal ?
 942 bool wxCairoMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
 943 {
 944     const cairo_matrix_t* tm = (cairo_matrix_t*) t->GetNativeMatrix();
 945     return (
 946         m_matrix.xx == tm->xx &&
 947         m_matrix.yx == tm->yx &&
 948         m_matrix.xy == tm->xy &&
 949         m_matrix.yy == tm->yy &&
 950         m_matrix.x0 == tm->x0 &&
 951         m_matrix.y0 == tm->y0 ) ;
 952 }
 953
 954 // return true if this is the identity matrix
 955 bool wxCairoMatrixData::IsIdentity() const
 956 {
 957     return ( m_matrix.xx == 1 && m_matrix.yy == 1 &&
 958         m_matrix.yx == 0 && m_matrix.xy == 0 && m_matrix.x0 == 0 && m_matrix.y0 == 0);
 959 }
 960
 961 //
 962 // transformation
 963 //
 964
 965 // add the translation to this matrix
 966 void wxCairoMatrixData::Translate( wxDouble dx , wxDouble dy )
 967 {
 968     cairo_matrix_translate( &m_matrix, dx, dy) ;
 969 }
 970
 971 // add the scale to this matrix
 972 void wxCairoMatrixData::Scale( wxDouble xScale , wxDouble yScale )
 973 {
 974     cairo_matrix_scale( &m_matrix, xScale, yScale) ;
 975 }
 976
 977 // add the rotation to this matrix (radians)
 978 void wxCairoMatrixData::Rotate( wxDouble angle )
 979 {
 980     cairo_matrix_rotate( &m_matrix, angle) ;
 981 }
 982
 983 //
 984 // apply the transforms
 985 //
 986
 987 // applies that matrix to the point
 988 void wxCairoMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
 989 {
 990     double lx = *x, ly = *y ;
 991     cairo_matrix_transform_point( &m_matrix, &lx, &ly);
 992     *x = lx;
 993     *y = ly;
 994 }
 995
 996 // applies the matrix except for translations
 997 void wxCairoMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
 998 {
 999     double lx = *dx, ly = *dy ;
1000     cairo_matrix_transform_distance( &m_matrix, &lx, &ly);
1001     *dx = lx;
1002     *dy = ly;
1003 }
1004
1005 // returns the native representation
1006 void * wxCairoMatrixData::GetNativeMatrix() const
1007 {
1008     return (void*) &m_matrix;
1009 }
1010
1011 //-----------------------------------------------------------------------------
1012 // wxCairoContext implementation
1013 //-----------------------------------------------------------------------------
1014
1015 class wxCairoOffsetHelper
1016 {
1017 public :
1018     wxCairoOffsetHelper( cairo_t* ctx , bool offset )
1019     {
1020         m_ctx = ctx;
1021         m_offset = offset;
1022         if ( m_offset )
1023              cairo_translate( m_ctx, 0.5, 0.5 );
1024     }
1025     ~wxCairoOffsetHelper( )
1026     {
1027         if ( m_offset )
1028             cairo_translate( m_ctx, -0.5, -0.5 );
1029     }
1030 public :
1031     cairo_t* m_ctx;
1032     bool m_offset;
1033 } ;
1034
1035 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
1036 : wxGraphicsContext(renderer)
1037 {
1038 #ifdef __WXGTK__
1039 #if wxUSE_NEW_DC
1040     wxGTKImplDC *impldc = (wxGTKImplDC*) dc.GetImpl();
1041     Init( gdk_cairo_create( impldc->GetGDKWindow() ) );
1042 #else
1043     Init( gdk_cairo_create( dc.m_window ) );
1044 #endif
1045 #endif
1046 #ifdef __WXMAC__
1047     int width, height;
1048     dc.GetSize( &width, &height );
1049     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1050     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1051     Init( cairo_create( surface ) );
1052     cairo_surface_destroy( surface );
1053 #endif
1054 }
1055
1056 #ifdef __WXGTK__
1057 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable )
1058 : wxGraphicsContext(renderer)
1059 {
1060     Init( gdk_cairo_create( drawable ) );
1061 }
1062 #endif
1063
1064 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
1065 : wxGraphicsContext(renderer)
1066 {
1067     Init( context );
1068 }
1069
1070 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
1071 : wxGraphicsContext(renderer)
1072 {
1073 #ifdef __WXGTK__
1074     // something along these lines (copied from dcclient)
1075
1076     // Some controls don't have m_wxwindow - like wxStaticBox, but the user
1077     // code should still be able to create wxClientDCs for them, so we will
1078     // use the parent window here then.
1079     if (window->m_wxwindow == NULL)
1080     {
1081         window = window->GetParent();
1082     }
1083
1084     wxASSERT_MSG( window->m_wxwindow, wxT("wxCairoContext needs a widget") );
1085
1086     Init(gdk_cairo_create(window->GTKGetDrawingWindow()));
1087 #endif
1088 }
1089
1090 wxCairoContext::~wxCairoContext()
1091 {
1092     if ( m_context )
1093     {
1094         PopState();
1095         PopState();
1096         cairo_destroy(m_context);
1097     }
1098 }
1099
1100 void wxCairoContext::Init(cairo_t *context)
1101 {
1102     m_context = context ;
1103     PushState();
1104     PushState();
1105 }
1106
1107
1108 void wxCairoContext::Clip( const wxRegion& region )
1109 {
1110     // Create a path with all the rectangles in the region
1111     wxGraphicsPath path = GetRenderer()->CreatePath();
1112     wxRegionIterator ri(region);
1113     while (ri)
1114     {
1115         path.AddRectangle(ri.GetX(), ri.GetY(), ri.GetW(), ri.GetH());
1116         ++ri;
1117     }
1118
1119     // Put it in the context
1120     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1121     cairo_append_path(m_context, cp);
1122
1123     // clip to that path
1124     cairo_clip(m_context);
1125     path.UnGetNativePath(cp);
1126 }
1127
1128 void wxCairoContext::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1129 {
1130     // Create a path with this rectangle
1131     wxGraphicsPath path = GetRenderer()->CreatePath();
1132     path.AddRectangle(x,y,w,h);
1133
1134     // Put it in the context
1135     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1136     cairo_append_path(m_context, cp);
1137
1138     // clip to that path
1139     cairo_clip(m_context);
1140     path.UnGetNativePath(cp);
1141 }
1142
1143 void wxCairoContext::ResetClip()
1144 {
1145     cairo_reset_clip(m_context);
1146 }
1147
1148
1149 void wxCairoContext::StrokePath( const wxGraphicsPath& path )
1150 {
1151     if ( !m_pen.IsNull() )
1152     {
1153         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1154         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1155         cairo_append_path(m_context,cp);
1156         ((wxCairoPenData*)m_pen.GetRefData())->Apply(this);
1157         cairo_stroke(m_context);
1158         path.UnGetNativePath(cp);
1159     }
1160 }
1161
1162 void wxCairoContext::FillPath( const wxGraphicsPath& path , int fillStyle )
1163 {
1164     if ( !m_brush.IsNull() )
1165     {
1166         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1167         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1168         cairo_append_path(m_context,cp);
1169         ((wxCairoBrushData*)m_brush.GetRefData())->Apply(this);
1170         cairo_set_fill_rule(m_context,fillStyle==wxODDEVEN_RULE ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
1171         cairo_fill(m_context);
1172         path.UnGetNativePath(cp);
1173     }
1174 }
1175
1176 void wxCairoContext::Rotate( wxDouble angle )
1177 {
1178     cairo_rotate(m_context,angle);
1179 }
1180
1181 void wxCairoContext::Translate( wxDouble dx , wxDouble dy )
1182 {
1183     cairo_translate(m_context,dx,dy);
1184 }
1185
1186 void wxCairoContext::Scale( wxDouble xScale , wxDouble yScale )
1187 {
1188     cairo_scale(m_context,xScale,yScale);
1189 }
1190
1191 // concatenates this transform with the current transform of this context
1192 void wxCairoContext::ConcatTransform( const wxGraphicsMatrix& matrix )
1193 {
1194     cairo_transform(m_context,(const cairo_matrix_t *) matrix.GetNativeMatrix());
1195 }
1196
1197 // sets the transform of this context
1198 void wxCairoContext::SetTransform( const wxGraphicsMatrix& matrix )
1199 {
1200     cairo_set_matrix(m_context,(const cairo_matrix_t*) matrix.GetNativeMatrix());
1201 }
1202
1203 // gets the matrix of this context
1204 wxGraphicsMatrix wxCairoContext::GetTransform() const
1205 {
1206     wxGraphicsMatrix matrix = CreateMatrix();
1207     cairo_get_matrix(m_context,(cairo_matrix_t*) matrix.GetNativeMatrix());
1208     return matrix;
1209 }
1210
1211
1212
1213 void wxCairoContext::PushState()
1214 {
1215     cairo_save(m_context);
1216 }
1217
1218 void wxCairoContext::PopState()
1219 {
1220     cairo_restore(m_context);
1221 }
1222
1223 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1224 {
1225     wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
1226
1227     cairo_surface_t* surface;
1228     int bw = bmp.GetWidth();
1229     int bh = bmp.GetHeight();
1230     wxBitmap bmpSource = bmp;  // we need a non-const instance
1231     unsigned char* buffer = new unsigned char[bw*bh*4];
1232     wxUint32* data = (wxUint32*)buffer;
1233
1234     // Create a surface object and copy the bitmap pixel data to it.  if the
1235     // image has alpha (or a mask represented as alpha) then we'll use a
1236     // different format and iterator than if it doesn't...
1237     if (bmpSource.HasAlpha() || bmpSource.GetMask())
1238     {
1239         surface = cairo_image_surface_create_for_data(
1240             buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
1241         wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1242         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1243
1244         wxAlphaPixelData::Iterator p(pixData);
1245         for (int y=0; y<bh; y++)
1246         {
1247             wxAlphaPixelData::Iterator rowStart = p;
1248             for (int x=0; x<bw; x++)
1249             {
1250                 // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
1251                 // with alpha in the upper 8 bits, then red, then green, then
1252                 // blue. The 32-bit quantities are stored native-endian.
1253                 // Pre-multiplied alpha is used.
1254                 unsigned char alpha = p.Alpha();
1255                 if (alpha == 0)
1256                     *data = 0;
1257                 else
1258                     *data = ( alpha                      << 24
1259                               | (p.Red() * alpha/255)    << 16
1260                               | (p.Green() * alpha/255)  <<  8
1261                               | (p.Blue() * alpha/255) );
1262                 ++data;
1263                 ++p;
1264             }
1265             p = rowStart;
1266             p.OffsetY(pixData, 1);
1267         }
1268     }
1269     else  // no alpha
1270     {
1271         surface = cairo_image_surface_create_for_data(
1272             buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
1273         wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1274         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1275
1276         wxNativePixelData::Iterator p(pixData);
1277         for (int y=0; y<bh; y++)
1278         {
1279             wxNativePixelData::Iterator rowStart = p;
1280             for (int x=0; x<bw; x++)
1281             {
1282                 // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
1283                 // the upper 8 bits unused. Red, Green, and Blue are stored in
1284                 // the remaining 24 bits in that order.  The 32-bit quantities
1285                 // are stored native-endian.
1286                 *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
1287                 ++data;
1288                 ++p;
1289             }
1290             p = rowStart;
1291             p.OffsetY(pixData, 1);
1292         }
1293     }
1294
1295
1296     PushState();
1297
1298     // In case we're scaling the image by using a width and height different
1299     // than the bitmap's size create a pattern transformation on the surface and
1300     // draw the transformed pattern.
1301     cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
1302     wxDouble scaleX = w / bw;
1303     wxDouble scaleY = h / bh;
1304     cairo_scale(m_context, scaleX, scaleY);
1305
1306     // prepare to draw the image
1307     cairo_translate(m_context, x, y);
1308     cairo_set_source(m_context, pattern);
1309     // use the original size here since the context is scaled already...
1310     cairo_rectangle(m_context, 0, 0, bw, bh);
1311     // fill the rectangle using the pattern
1312     cairo_fill(m_context);
1313
1314     // clean up
1315     cairo_pattern_destroy(pattern);
1316     cairo_surface_destroy(surface);
1317     delete [] buffer;
1318     PopState();
1319 }
1320
1321 void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1322 {
1323     // An icon is a bitmap on wxGTK, so do this the easy way.  When we want to
1324     // start using the Cairo backend on other platforms then we may need to
1325     // fiddle with this...
1326     DrawBitmap(icon, x, y, w, h);
1327 }
1328
1329
1330 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
1331 {
1332     if ( m_font.IsNull() || str.empty())
1333         return;
1334
1335 #ifdef __WXGTK__
1336     const wxCharBuffer data = str.utf8_str();
1337     if ( !data )
1338         return;
1339     size_t datalen = strlen(data);
1340     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1341
1342     PangoLayout *layout = pango_cairo_create_layout (m_context);
1343     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1344     pango_layout_set_text(layout, data, datalen);
1345     cairo_move_to(m_context, x, y);
1346     pango_cairo_show_layout (m_context, layout);
1347
1348     g_object_unref (layout);
1349 #else
1350     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1351     // Cairo's x,y for drawing text is at the baseline, so we need to adjust
1352     // the position we move to by the ascent.
1353     cairo_font_extents_t fe;
1354     cairo_font_extents(m_context, &fe);
1355     cairo_move_to(m_context, x, y+fe.ascent);
1356
1357     const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1358     cairo_show_text(m_context,buf);
1359 #endif
1360 }
1361
1362 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
1363                                     wxDouble *descent, wxDouble *externalLeading ) const
1364 {
1365     if ( width )
1366         *width = 0;
1367     if ( height )
1368         *height = 0;
1369     if ( descent )
1370         *descent = 0;
1371     if ( externalLeading )
1372         *externalLeading = 0;
1373
1374     if ( m_font.IsNull() || str.empty())
1375         return;
1376
1377 #ifdef __WXGTK__
1378     int w, h;
1379
1380     PangoLayout *layout = pango_cairo_create_layout (m_context);
1381     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1382     const wxCharBuffer data = str.utf8_str();
1383     if ( !data )
1384     {
1385         return;
1386     }
1387     pango_layout_set_text( layout, data, strlen(data) );
1388     pango_layout_get_pixel_size (layout, &w, &h);
1389     if ( width )
1390         *width = w;
1391     if ( height )
1392         *height = h;
1393     if (descent)
1394     {
1395         PangoLayoutIter *iter = pango_layout_get_iter(layout);
1396         int baseline = pango_layout_iter_get_baseline(iter);
1397         pango_layout_iter_free(iter);
1398         *descent = h - PANGO_PIXELS(baseline);
1399     }
1400     g_object_unref (layout);
1401 #else
1402     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
1403
1404     if (width)
1405     {
1406         const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1407         cairo_text_extents_t te;
1408         cairo_text_extents(m_context, buf, &te);
1409         *width = te.width;
1410     }
1411
1412     if (height || descent || externalLeading)
1413     {
1414         cairo_font_extents_t fe;
1415         cairo_font_extents(m_context, &fe);
1416
1417         // some backends have negative descents
1418
1419         if ( fe.descent < 0 )
1420             fe.descent = -fe.descent;
1421
1422         if ( fe.height < (fe.ascent + fe.descent ) )
1423         {
1424             // some backends are broken re height ... (eg currently ATSUI)
1425             fe.height = fe.ascent + fe.descent;
1426         }
1427
1428         if (height)
1429             *height = fe.height;
1430         if ( descent )
1431             *descent = fe.descent;
1432         if ( externalLeading )
1433             *externalLeading = wxMax(0, fe.height - (fe.ascent + fe.descent));
1434     }
1435 #endif
1436 }
1437
1438 void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
1439 {
1440     widths.Empty();
1441     widths.Add(0, text.length());
1442
1443     if (text.empty())
1444         return;
1445
1446     // TODO
1447 }
1448
1449 void * wxCairoContext::GetNativeContext()
1450 {
1451     return m_context;
1452 }
1453
1454 //-----------------------------------------------------------------------------
1455 // wxCairoRenderer declaration
1456 //-----------------------------------------------------------------------------
1457
1458 class WXDLLIMPEXP_CORE wxCairoRenderer : public wxGraphicsRenderer
1459 {
1460 public :
1461     wxCairoRenderer() {}
1462
1463     virtual ~wxCairoRenderer() {}
1464
1465     // Context
1466
1467     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);
1468
1469 #ifdef __WXMSW__
1470     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
1471 #endif
1472
1473     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
1474
1475     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
1476
1477     virtual wxGraphicsContext * CreateContext( wxWindow* window );
1478
1479     virtual wxGraphicsContext * CreateMeasuringContext();
1480
1481     // Path
1482
1483     virtual wxGraphicsPath CreatePath();
1484
1485     // Matrix
1486
1487     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
1488         wxDouble tx=0.0, wxDouble ty=0.0);
1489
1490
1491     virtual wxGraphicsPen CreatePen(const wxPen& pen) ;
1492
1493     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
1494
1495     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1496     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1497         const wxColour&c1, const wxColour&c2) ;
1498
1499     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1500     // with radius r and color cColor
1501     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1502         const wxColour &oColor, const wxColour &cColor) ;
1503
1504     // sets the font
1505     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
1506
1507 private :
1508     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
1509 } ;
1510
1511 //-----------------------------------------------------------------------------
1512 // wxCairoRenderer implementation
1513 //-----------------------------------------------------------------------------
1514
1515 IMPLEMENT_DYNAMIC_CLASS(wxCairoRenderer,wxGraphicsRenderer)
1516
1517 static wxCairoRenderer gs_cairoGraphicsRenderer;
1518 // temporary hack to allow creating a cairo context on any platform
1519 extern wxGraphicsRenderer* gCairoRenderer;
1520 wxGraphicsRenderer* gCairoRenderer = &gs_cairoGraphicsRenderer;
1521
1522 #ifdef __WXGTK__
1523 wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
1524 {
1525     return &gs_cairoGraphicsRenderer;
1526 }
1527 #endif
1528
1529 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
1530 {
1531     return new wxCairoContext(this,dc);
1532 }
1533
1534 #ifdef __WXMSW__
1535 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxMemoryDC& dc)
1536 {
1537     return NULL;
1538 }
1539 #endif
1540
1541 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeContext( void * context )
1542 {
1543     return new wxCairoContext(this,(cairo_t*)context);
1544 }
1545
1546
1547 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeWindow( void * window )
1548 {
1549 #ifdef __WXGTK__
1550     return new wxCairoContext(this,(GdkDrawable*)window);
1551 #else
1552     return NULL;
1553 #endif
1554 }
1555
1556 wxGraphicsContext * wxCairoRenderer::CreateMeasuringContext()
1557 {
1558     return NULL;
1559     // TODO
1560 }
1561
1562 wxGraphicsContext * wxCairoRenderer::CreateContext( wxWindow* window )
1563 {
1564     return new wxCairoContext(this, window );
1565 }
1566
1567 // Path
1568
1569 wxGraphicsPath wxCairoRenderer::CreatePath()
1570 {
1571     wxGraphicsPath path;
1572     path.SetRefData( new wxCairoPathData(this) );
1573     return path;
1574 }
1575
1576
1577 // Matrix
1578
1579 wxGraphicsMatrix wxCairoRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
1580                                                 wxDouble tx, wxDouble ty)
1581
1582 {
1583     wxGraphicsMatrix m;
1584     wxCairoMatrixData* data = new wxCairoMatrixData( this );
1585     data->Set( a,b,c,d,tx,ty ) ;
1586     m.SetRefData(data);
1587     return m;
1588 }
1589
1590 wxGraphicsPen wxCairoRenderer::CreatePen(const wxPen& pen)
1591 {
1592     if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
1593         return wxNullGraphicsPen;
1594     else
1595     {
1596         wxGraphicsPen p;
1597         p.SetRefData(new wxCairoPenData( this, pen ));
1598         return p;
1599     }
1600 }
1601
1602 wxGraphicsBrush wxCairoRenderer::CreateBrush(const wxBrush& brush )
1603 {
1604     if ( !brush.Ok() || brush.GetStyle() == wxTRANSPARENT )
1605         return wxNullGraphicsBrush;
1606     else
1607     {
1608         wxGraphicsBrush p;
1609         p.SetRefData(new wxCairoBrushData( this, brush ));
1610         return p;
1611     }
1612 }
1613
1614 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1615 wxGraphicsBrush wxCairoRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1616                                                                       const wxColour&c1, const wxColour&c2)
1617 {
1618     wxGraphicsBrush p;
1619     wxCairoBrushData* d = new wxCairoBrushData( this );
1620     d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
1621     p.SetRefData(d);
1622     return p;
1623 }
1624
1625 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1626 // with radius r and color cColor
1627 wxGraphicsBrush wxCairoRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1628                                                                       const wxColour &oColor, const wxColour &cColor)
1629 {
1630     wxGraphicsBrush p;
1631     wxCairoBrushData* d = new wxCairoBrushData( this );
1632     d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
1633     p.SetRefData(d);
1634     return p;
1635 }
1636
1637 // sets the font
1638 wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour &col )
1639 {
1640     if ( font.Ok() )
1641     {
1642         wxGraphicsFont p;
1643         p.SetRefData(new wxCairoFontData( this , font, col ));
1644         return p;
1645     }
1646     else
1647         return wxNullGraphicsFont;
1648 }
1649
1650 #endif  // wxUSE_GRAPHICS_CONTEXT