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 #else
 739     cairo_select_font_face(ctext, m_fontName, m_slant, m_weights );
 740     cairo_set_font_size(ctext, m_size );
 741 #endif
 742 }
 743
 744 //-----------------------------------------------------------------------------
 745 // wxCairoPathData implementation
 746 //-----------------------------------------------------------------------------
 747
 748 wxCairoPathData::wxCairoPathData( wxGraphicsRenderer* renderer, cairo_t* pathcontext)
 749     : wxGraphicsPathData(renderer)
 750 {
 751     if (pathcontext)
 752     {
 753         m_pathContext = pathcontext;
 754     }
 755     else
 756     {
 757         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 758         m_pathContext = cairo_create(surface);
 759         cairo_surface_destroy (surface);
 760     }
 761 }
 762
 763 wxCairoPathData::~wxCairoPathData()
 764 {
 765     cairo_destroy(m_pathContext);
 766 }
 767
 768 wxGraphicsObjectRefData *wxCairoPathData::Clone() const
 769 {
 770     cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 771     cairo_t* pathcontext = cairo_create(surface);
 772     cairo_surface_destroy (surface);
 773
 774     cairo_path_t* path = cairo_copy_path(m_pathContext);
 775     cairo_append_path(pathcontext, path);
 776     cairo_path_destroy(path);
 777     return new wxCairoPathData( GetRenderer() ,pathcontext);
 778 }
 779
 780
 781 void* wxCairoPathData::GetNativePath() const
 782 {
 783     return cairo_copy_path(m_pathContext) ;
 784 }
 785
 786 void wxCairoPathData::UnGetNativePath(void *p) const
 787 {
 788     cairo_path_destroy((cairo_path_t*)p);
 789 }
 790
 791 //
 792 // The Primitives
 793 //
 794
 795 void wxCairoPathData::MoveToPoint( wxDouble x , wxDouble y )
 796 {
 797     cairo_move_to(m_pathContext,x,y);
 798 }
 799
 800 void wxCairoPathData::AddLineToPoint( wxDouble x , wxDouble y )
 801 {
 802     cairo_line_to(m_pathContext,x,y);
 803 }
 804
 805 void wxCairoPathData::AddPath( const wxGraphicsPathData* path )
 806 {
 807     cairo_path_t* p = (cairo_path_t*)path->GetNativePath();
 808     cairo_append_path(m_pathContext, p);
 809     UnGetNativePath(p);
 810 }
 811
 812 void wxCairoPathData::CloseSubpath()
 813 {
 814     cairo_close_path(m_pathContext);
 815 }
 816
 817 void wxCairoPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 818 {
 819     cairo_curve_to(m_pathContext,cx1,cy1,cx2,cy2,x,y);
 820 }
 821
 822 // gets the last point of the current path, (0,0) if not yet set
 823 void wxCairoPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 824 {
 825     double dx,dy;
 826     cairo_get_current_point(m_pathContext,&dx,&dy);
 827     if (x)
 828         *x = dx;
 829     if (y)
 830         *y = dy;
 831 }
 832
 833 void wxCairoPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, double startAngle, double endAngle, bool clockwise )
 834 {
 835     // as clockwise means positive in our system (y pointing downwards)
 836     // TODO make this interpretation dependent of the
 837     // real device trans
 838     if ( clockwise||(endAngle-startAngle)>=2*M_PI)
 839         cairo_arc(m_pathContext,x,y,r,startAngle,endAngle);
 840     else
 841         cairo_arc_negative(m_pathContext,x,y,r,startAngle,endAngle);
 842 }
 843
 844 // transforms each point of this path by the matrix
 845 void wxCairoPathData::Transform( const wxGraphicsMatrixData* matrix )
 846 {
 847     // as we don't have a true path object, we have to apply the inverse
 848     // matrix to the context
 849     cairo_matrix_t m = *((cairo_matrix_t*) matrix->GetNativeMatrix());
 850     cairo_matrix_invert( &m );
 851     cairo_transform(m_pathContext,&m);
 852 }
 853
 854 // gets the bounding box enclosing all points (possibly including control points)
 855 void wxCairoPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 856 {
 857     double x1,y1,x2,y2;
 858
 859     cairo_stroke_extents( m_pathContext, &x1, &y1, &x2, &y2 );
 860     if ( x2 < x1 )
 861     {
 862         *x = x2;
 863         *w = x1-x2;
 864     }
 865     else
 866     {
 867         *x = x1;
 868         *w = x2-x1;
 869     }
 870
 871     if( y2 < y1 )
 872     {
 873         *y = y2;
 874         *h = y1-y2;
 875     }
 876     else
 877     {
 878         *y = y1;
 879         *h = y2-y1;
 880     }
 881 }
 882
 883 bool wxCairoPathData::Contains( wxDouble x, wxDouble y, int WXUNUSED(fillStyle) ) const
 884 {
 885     return cairo_in_stroke( m_pathContext, x, y) != 0;
 886 }
 887
 888 //-----------------------------------------------------------------------------
 889 // wxCairoMatrixData implementation
 890 //-----------------------------------------------------------------------------
 891
 892 wxCairoMatrixData::wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix )
 893     : wxGraphicsMatrixData(renderer)
 894 {
 895     if ( matrix )
 896         m_matrix = *matrix;
 897 }
 898
 899 wxCairoMatrixData::~wxCairoMatrixData()
 900 {
 901     // nothing to do
 902 }
 903
 904 wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 905 {
 906     return new wxCairoMatrixData(GetRenderer(),&m_matrix);
 907 }
 908
 909 // concatenates the matrix
 910 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 911 {
 912     cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
 913 }
 914
 915 // sets the matrix to the respective values
 916 void wxCairoMatrixData::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 917                         wxDouble tx, wxDouble ty)
 918 {
 919     cairo_matrix_init( &m_matrix, a, b, c, d, tx, ty);
 920 }
 921
 922 // gets the component valuess of the matrix
 923 void wxCairoMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
 924                             wxDouble* d, wxDouble* tx, wxDouble* ty) const
 925 {
 926     if (a)  *a = m_matrix.xx;
 927     if (b)  *b = m_matrix.yx;
 928     if (c)  *c = m_matrix.xy;
 929     if (d)  *d = m_matrix.yy;
 930     if (tx) *tx= m_matrix.x0;
 931     if (ty) *ty= m_matrix.y0;
 932 }
 933
 934 // makes this the inverse matrix
 935 void wxCairoMatrixData::Invert()
 936 {
 937     cairo_matrix_invert( &m_matrix );
 938 }
 939
 940 // returns true if the elements of the transformation matrix are equal ?
 941 bool wxCairoMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
 942 {
 943     const cairo_matrix_t* tm = (cairo_matrix_t*) t->GetNativeMatrix();
 944     return (
 945         m_matrix.xx == tm->xx &&
 946         m_matrix.yx == tm->yx &&
 947         m_matrix.xy == tm->xy &&
 948         m_matrix.yy == tm->yy &&
 949         m_matrix.x0 == tm->x0 &&
 950         m_matrix.y0 == tm->y0 ) ;
 951 }
 952
 953 // return true if this is the identity matrix
 954 bool wxCairoMatrixData::IsIdentity() const
 955 {
 956     return ( m_matrix.xx == 1 && m_matrix.yy == 1 &&
 957         m_matrix.yx == 0 && m_matrix.xy == 0 && m_matrix.x0 == 0 && m_matrix.y0 == 0);
 958 }
 959
 960 //
 961 // transformation
 962 //
 963
 964 // add the translation to this matrix
 965 void wxCairoMatrixData::Translate( wxDouble dx , wxDouble dy )
 966 {
 967     cairo_matrix_translate( &m_matrix, dx, dy) ;
 968 }
 969
 970 // add the scale to this matrix
 971 void wxCairoMatrixData::Scale( wxDouble xScale , wxDouble yScale )
 972 {
 973     cairo_matrix_scale( &m_matrix, xScale, yScale) ;
 974 }
 975
 976 // add the rotation to this matrix (radians)
 977 void wxCairoMatrixData::Rotate( wxDouble angle )
 978 {
 979     cairo_matrix_rotate( &m_matrix, angle) ;
 980 }
 981
 982 //
 983 // apply the transforms
 984 //
 985
 986 // applies that matrix to the point
 987 void wxCairoMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
 988 {
 989     double lx = *x, ly = *y ;
 990     cairo_matrix_transform_point( &m_matrix, &lx, &ly);
 991     *x = lx;
 992     *y = ly;
 993 }
 994
 995 // applies the matrix except for translations
 996 void wxCairoMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
 997 {
 998     double lx = *dx, ly = *dy ;
 999     cairo_matrix_transform_distance( &m_matrix, &lx, &ly);
1000     *dx = lx;
1001     *dy = ly;
1002 }
1003
1004 // returns the native representation
1005 void * wxCairoMatrixData::GetNativeMatrix() const
1006 {
1007     return (void*) &m_matrix;
1008 }
1009
1010 //-----------------------------------------------------------------------------
1011 // wxCairoContext implementation
1012 //-----------------------------------------------------------------------------
1013
1014 class wxCairoOffsetHelper
1015 {
1016 public :
1017     wxCairoOffsetHelper( cairo_t* ctx , bool offset )
1018     {
1019         m_ctx = ctx;
1020         m_offset = offset;
1021         if ( m_offset )
1022              cairo_translate( m_ctx, 0.5, 0.5 );
1023     }
1024     ~wxCairoOffsetHelper( )
1025     {
1026         if ( m_offset )
1027             cairo_translate( m_ctx, -0.5, -0.5 );
1028     }
1029 public :
1030     cairo_t* m_ctx;
1031     bool m_offset;
1032 } ;
1033
1034 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
1035 : wxGraphicsContext(renderer)
1036 {
1037 #ifdef __WXGTK__
1038     Init( gdk_cairo_create( dc.m_window ) );
1039 #endif
1040 #ifdef __WXMAC__
1041     int width, height;
1042     dc.GetSize( &width, &height );
1043     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1044     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1045     Init( cairo_create( surface ) );
1046     cairo_surface_destroy( surface );
1047 #endif
1048 }
1049
1050 #ifdef __WXGTK__
1051 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable )
1052 : wxGraphicsContext(renderer)
1053 {
1054     Init( gdk_cairo_create( drawable ) );
1055 }
1056 #endif
1057
1058 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
1059 : wxGraphicsContext(renderer)
1060 {
1061     Init( context );
1062 }
1063
1064 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
1065 : wxGraphicsContext(renderer)
1066 {
1067 #ifdef __WXGTK__
1068     // something along these lines (copied from dcclient)
1069
1070     // Some controls don't have m_wxwindow - like wxStaticBox, but the user
1071     // code should still be able to create wxClientDCs for them, so we will
1072     // use the parent window here then.
1073     if (window->m_wxwindow == NULL)
1074     {
1075         window = window->GetParent();
1076     }
1077
1078     wxASSERT_MSG( window->m_wxwindow, wxT("wxCairoContext needs a widget") );
1079
1080     Init(gdk_cairo_create(window->GTKGetDrawingWindow()));
1081 #endif
1082 }
1083
1084 wxCairoContext::~wxCairoContext()
1085 {
1086     if ( m_context )
1087     {
1088         PopState();
1089         PopState();
1090         cairo_destroy(m_context);
1091     }
1092 }
1093
1094 void wxCairoContext::Init(cairo_t *context)
1095 {
1096     m_context = context ;
1097     PushState();
1098     PushState();
1099 }
1100
1101
1102 void wxCairoContext::Clip( const wxRegion& region )
1103 {
1104     // Create a path with all the rectangles in the region
1105     wxGraphicsPath path = GetRenderer()->CreatePath();
1106     wxRegionIterator ri(region);
1107     while (ri)
1108     {
1109         path.AddRectangle(ri.GetX(), ri.GetY(), ri.GetW(), ri.GetH());
1110         ++ri;
1111     }
1112
1113     // Put it in the context
1114     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1115     cairo_append_path(m_context, cp);
1116
1117     // clip to that path
1118     cairo_clip(m_context);
1119     path.UnGetNativePath(cp);
1120 }
1121
1122 void wxCairoContext::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1123 {
1124     // Create a path with this rectangle
1125     wxGraphicsPath path = GetRenderer()->CreatePath();
1126     path.AddRectangle(x,y,w,h);
1127
1128     // Put it in the context
1129     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1130     cairo_append_path(m_context, cp);
1131
1132     // clip to that path
1133     cairo_clip(m_context);
1134     path.UnGetNativePath(cp);
1135 }
1136
1137 void wxCairoContext::ResetClip()
1138 {
1139     cairo_reset_clip(m_context);
1140 }
1141
1142
1143 void wxCairoContext::StrokePath( const wxGraphicsPath& path )
1144 {
1145     if ( !m_pen.IsNull() )
1146     {
1147         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1148         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1149         cairo_append_path(m_context,cp);
1150         ((wxCairoPenData*)m_pen.GetRefData())->Apply(this);
1151         cairo_stroke(m_context);
1152         path.UnGetNativePath(cp);
1153     }
1154 }
1155
1156 void wxCairoContext::FillPath( const wxGraphicsPath& path , int fillStyle )
1157 {
1158     if ( !m_brush.IsNull() )
1159     {
1160         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1161         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1162         cairo_append_path(m_context,cp);
1163         ((wxCairoBrushData*)m_brush.GetRefData())->Apply(this);
1164         cairo_set_fill_rule(m_context,fillStyle==wxODDEVEN_RULE ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
1165         cairo_fill(m_context);
1166         path.UnGetNativePath(cp);
1167     }
1168 }
1169
1170 void wxCairoContext::Rotate( wxDouble angle )
1171 {
1172     cairo_rotate(m_context,angle);
1173 }
1174
1175 void wxCairoContext::Translate( wxDouble dx , wxDouble dy )
1176 {
1177     cairo_translate(m_context,dx,dy);
1178 }
1179
1180 void wxCairoContext::Scale( wxDouble xScale , wxDouble yScale )
1181 {
1182     cairo_scale(m_context,xScale,yScale);
1183 }
1184
1185 // concatenates this transform with the current transform of this context
1186 void wxCairoContext::ConcatTransform( const wxGraphicsMatrix& matrix )
1187 {
1188     cairo_transform(m_context,(const cairo_matrix_t *) matrix.GetNativeMatrix());
1189 }
1190
1191 // sets the transform of this context
1192 void wxCairoContext::SetTransform( const wxGraphicsMatrix& matrix )
1193 {
1194     cairo_set_matrix(m_context,(const cairo_matrix_t*) matrix.GetNativeMatrix());
1195 }
1196
1197 // gets the matrix of this context
1198 wxGraphicsMatrix wxCairoContext::GetTransform() const
1199 {
1200     wxGraphicsMatrix matrix = CreateMatrix();
1201     cairo_get_matrix(m_context,(cairo_matrix_t*) matrix.GetNativeMatrix());
1202     return matrix;
1203 }
1204
1205
1206
1207 void wxCairoContext::PushState()
1208 {
1209     cairo_save(m_context);
1210 }
1211
1212 void wxCairoContext::PopState()
1213 {
1214     cairo_restore(m_context);
1215 }
1216
1217 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1218 {
1219     wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
1220
1221     cairo_surface_t* surface;
1222     int bw = bmp.GetWidth();
1223     int bh = bmp.GetHeight();
1224     wxBitmap bmpSource = bmp;  // we need a non-const instance
1225     unsigned char* buffer = new unsigned char[bw*bh*4];
1226     wxUint32* data = (wxUint32*)buffer;
1227
1228     // Create a surface object and copy the bitmap pixel data to it.  if the
1229     // image has alpha (or a mask represented as alpha) then we'll use a
1230     // different format and iterator than if it doesn't...
1231     if (bmpSource.HasAlpha() || bmpSource.GetMask())
1232     {
1233         surface = cairo_image_surface_create_for_data(
1234             buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
1235         wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1236         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1237
1238         wxAlphaPixelData::Iterator p(pixData);
1239         for (int y=0; y<bh; y++)
1240         {
1241             wxAlphaPixelData::Iterator rowStart = p;
1242             for (int x=0; x<bw; x++)
1243             {
1244                 // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
1245                 // with alpha in the upper 8 bits, then red, then green, then
1246                 // blue. The 32-bit quantities are stored native-endian.
1247                 // Pre-multiplied alpha is used.
1248                 unsigned char alpha = p.Alpha();
1249                 if (alpha == 0)
1250                     *data = 0;
1251                 else
1252                     *data = ( alpha                      << 24
1253                               | (p.Red() * alpha/255)    << 16
1254                               | (p.Green() * alpha/255)  <<  8
1255                               | (p.Blue() * alpha/255) );
1256                 ++data;
1257                 ++p;
1258             }
1259             p = rowStart;
1260             p.OffsetY(pixData, 1);
1261         }
1262     }
1263     else  // no alpha
1264     {
1265         surface = cairo_image_surface_create_for_data(
1266             buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
1267         wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1268         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1269
1270         wxNativePixelData::Iterator p(pixData);
1271         for (int y=0; y<bh; y++)
1272         {
1273             wxNativePixelData::Iterator rowStart = p;
1274             for (int x=0; x<bw; x++)
1275             {
1276                 // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
1277                 // the upper 8 bits unused. Red, Green, and Blue are stored in
1278                 // the remaining 24 bits in that order.  The 32-bit quantities
1279                 // are stored native-endian.
1280                 *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
1281                 ++data;
1282                 ++p;
1283             }
1284             p = rowStart;
1285             p.OffsetY(pixData, 1);
1286         }
1287     }
1288
1289
1290     PushState();
1291
1292     // In case we're scaling the image by using a width and height different
1293     // than the bitmap's size create a pattern transformation on the surface and
1294     // draw the transformed pattern.
1295     cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
1296     wxDouble scaleX = w / bw;
1297     wxDouble scaleY = h / bh;
1298     cairo_scale(m_context, scaleX, scaleY);
1299
1300     // prepare to draw the image
1301     cairo_translate(m_context, x, y);
1302     cairo_set_source(m_context, pattern);
1303     // use the original size here since the context is scaled already...
1304     cairo_rectangle(m_context, 0, 0, bw, bh);
1305     // fill the rectangle using the pattern
1306     cairo_fill(m_context);
1307
1308     // clean up
1309     cairo_pattern_destroy(pattern);
1310     cairo_surface_destroy(surface);
1311     delete [] buffer;
1312     PopState();
1313 }
1314
1315 void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1316 {
1317     // An icon is a bitmap on wxGTK, so do this the easy way.  When we want to
1318     // start using the Cairo backend on other platforms then we may need to
1319     // fiddle with this...
1320     DrawBitmap(icon, x, y, w, h);
1321 }
1322
1323
1324 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
1325 {
1326     if ( m_font.IsNull() || str.empty())
1327         return;
1328
1329 #ifdef __WXGTK__
1330     const wxCharBuffer data = wxConvUTF8.cWC2MB( str );
1331     if ( !data )
1332         return;
1333     size_t datalen = strlen(data);
1334     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1335
1336     PangoLayout *layout = pango_cairo_create_layout (m_context);
1337     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1338     pango_layout_set_text(layout, data, datalen);
1339     cairo_move_to(m_context, x, y);
1340     pango_cairo_show_layout (m_context, layout);
1341
1342     g_object_unref (layout);
1343 #else
1344     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1345     // Cairo's x,y for drawing text is at the baseline, so we need to adjust
1346     // the position we move to by the ascent.
1347     cairo_font_extents_t fe;
1348     cairo_font_extents(m_context, &fe);
1349     cairo_move_to(m_context, x, y+fe.ascent);
1350
1351     const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1352     cairo_show_text(m_context,buf);
1353 #endif
1354 }
1355
1356 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
1357                                     wxDouble *descent, wxDouble *externalLeading ) const
1358 {
1359     if ( width )
1360         *width = 0;
1361     if ( height )
1362         *height = 0;
1363     if ( descent )
1364         *descent = 0;
1365     if ( externalLeading )
1366         *externalLeading = 0;
1367
1368     if ( m_font.IsNull() || str.empty())
1369         return;
1370
1371 #ifdef __WXGTK__
1372     int w, h;
1373
1374     PangoLayout *layout = pango_cairo_create_layout (m_context);
1375     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1376     const wxCharBuffer data = wxConvUTF8.cWC2MB( str );
1377     if ( !data )
1378     {
1379         return;
1380     }
1381     pango_layout_set_text( layout, data, strlen(data) );
1382     pango_layout_get_pixel_size (layout, &w, &h);
1383     if ( width )
1384         *width = w;
1385     if ( height )
1386         *height = h;
1387     if (descent)
1388     {
1389         PangoLayoutIter *iter = pango_layout_get_iter(layout);
1390         int baseline = pango_layout_iter_get_baseline(iter);
1391         pango_layout_iter_free(iter);
1392         *descent = h - PANGO_PIXELS(baseline);
1393     }
1394     g_object_unref (layout);
1395 #else
1396     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
1397
1398     if (width)
1399     {
1400         const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1401         cairo_text_extents_t te;
1402         cairo_text_extents(m_context, buf, &te);
1403         *width = te.width;
1404     }
1405
1406     if (height || descent || externalLeading)
1407     {
1408         cairo_font_extents_t fe;
1409         cairo_font_extents(m_context, &fe);
1410
1411         if (height)
1412             *height = fe.height;
1413         if ( descent )
1414             *descent = fe.descent;
1415         if ( externalLeading )
1416             *externalLeading = wxMax(0, fe.height - (fe.ascent + fe.descent));
1417     }
1418 #endif
1419 }
1420
1421 void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
1422 {
1423     widths.Empty();
1424     widths.Add(0, text.length());
1425
1426     if (text.empty())
1427         return;
1428
1429     // TODO
1430 }
1431
1432 void * wxCairoContext::GetNativeContext()
1433 {
1434     return m_context;
1435 }
1436
1437 //-----------------------------------------------------------------------------
1438 // wxCairoRenderer declaration
1439 //-----------------------------------------------------------------------------
1440
1441 class WXDLLIMPEXP_CORE wxCairoRenderer : public wxGraphicsRenderer
1442 {
1443 public :
1444     wxCairoRenderer() {}
1445
1446     virtual ~wxCairoRenderer() {}
1447
1448     // Context
1449
1450     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);
1451
1452 #ifdef __WXMSW__
1453     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
1454 #endif
1455
1456     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
1457
1458     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
1459
1460     virtual wxGraphicsContext * CreateContext( wxWindow* window );
1461
1462     virtual wxGraphicsContext * CreateMeasuringContext();
1463
1464     // Path
1465
1466     virtual wxGraphicsPath CreatePath();
1467
1468     // Matrix
1469
1470     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
1471         wxDouble tx=0.0, wxDouble ty=0.0);
1472
1473
1474     virtual wxGraphicsPen CreatePen(const wxPen& pen) ;
1475
1476     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
1477
1478     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1479     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1480         const wxColour&c1, const wxColour&c2) ;
1481
1482     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1483     // with radius r and color cColor
1484     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1485         const wxColour &oColor, const wxColour &cColor) ;
1486
1487     // sets the font
1488     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
1489
1490 private :
1491     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
1492 } ;
1493
1494 //-----------------------------------------------------------------------------
1495 // wxCairoRenderer implementation
1496 //-----------------------------------------------------------------------------
1497
1498 IMPLEMENT_DYNAMIC_CLASS(wxCairoRenderer,wxGraphicsRenderer)
1499
1500 static wxCairoRenderer gs_cairoGraphicsRenderer;
1501
1502 #ifdef __WXGTK__
1503 wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
1504 {
1505     return &gs_cairoGraphicsRenderer;
1506 }
1507 #endif
1508
1509 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
1510 {
1511     return new wxCairoContext(this,dc);
1512 }
1513
1514 #ifdef __WXMSW__
1515 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxMemoryDC& dc)
1516 {
1517     return NULL;
1518 }
1519 #endif
1520
1521 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeContext( void * context )
1522 {
1523     return new wxCairoContext(this,(cairo_t*)context);
1524 }
1525
1526
1527 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeWindow( void * window )
1528 {
1529 #ifdef __WXGTK__
1530     return new wxCairoContext(this,(GdkDrawable*)window);
1531 #else
1532     return NULL;
1533 #endif
1534 }
1535
1536 wxGraphicsContext * wxCairoRenderer::CreateMeasuringContext()
1537 {
1538     return NULL;
1539     // TODO
1540 }
1541
1542 wxGraphicsContext * wxCairoRenderer::CreateContext( wxWindow* window )
1543 {
1544     return new wxCairoContext(this, window );
1545 }
1546
1547 // Path
1548
1549 wxGraphicsPath wxCairoRenderer::CreatePath()
1550 {
1551     wxGraphicsPath path;
1552     path.SetRefData( new wxCairoPathData(this) );
1553     return path;
1554 }
1555
1556
1557 // Matrix
1558
1559 wxGraphicsMatrix wxCairoRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
1560                                                 wxDouble tx, wxDouble ty)
1561
1562 {
1563     wxGraphicsMatrix m;
1564     wxCairoMatrixData* data = new wxCairoMatrixData( this );
1565     data->Set( a,b,c,d,tx,ty ) ;
1566     m.SetRefData(data);
1567     return m;
1568 }
1569
1570 wxGraphicsPen wxCairoRenderer::CreatePen(const wxPen& pen)
1571 {
1572     if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
1573         return wxNullGraphicsPen;
1574     else
1575     {
1576         wxGraphicsPen p;
1577         p.SetRefData(new wxCairoPenData( this, pen ));
1578         return p;
1579     }
1580 }
1581
1582 wxGraphicsBrush wxCairoRenderer::CreateBrush(const wxBrush& brush )
1583 {
1584     if ( !brush.Ok() || brush.GetStyle() == wxTRANSPARENT )
1585         return wxNullGraphicsBrush;
1586     else
1587     {
1588         wxGraphicsBrush p;
1589         p.SetRefData(new wxCairoBrushData( this, brush ));
1590         return p;
1591     }
1592 }
1593
1594 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1595 wxGraphicsBrush wxCairoRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1596                                                                       const wxColour&c1, const wxColour&c2)
1597 {
1598     wxGraphicsBrush p;
1599     wxCairoBrushData* d = new wxCairoBrushData( this );
1600     d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
1601     p.SetRefData(d);
1602     return p;
1603 }
1604
1605 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1606 // with radius r and color cColor
1607 wxGraphicsBrush wxCairoRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1608                                                                       const wxColour &oColor, const wxColour &cColor)
1609 {
1610     wxGraphicsBrush p;
1611     wxCairoBrushData* d = new wxCairoBrushData( this );
1612     d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
1613     p.SetRefData(d);
1614     return p;
1615 }
1616
1617 // sets the font
1618 wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour &col )
1619 {
1620     if ( font.Ok() )
1621     {
1622         wxGraphicsFont p;
1623         p.SetRefData(new wxCairoFontData( this , font, col ));
1624         return p;
1625     }
1626     else
1627         return wxNullGraphicsFont;
1628 }
1629
1630 #endif  // wxUSE_GRAPHICS_CONTEXT