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/private/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 #include "wx/gtk/dc.h"
 103 #endif
 104
 105 #ifdef __WXMSW__
 106 #include <cairo-win32.h>
 107 #endif
 108
 109 #ifdef __WXMAC__
 110 #include "wx/mac/private.h"
 111 #include <cairo-quartz.h>
 112 #include <cairo-atsui.h>
 113 #endif
 114
 115 class WXDLLIMPEXP_CORE wxCairoPathData : public wxGraphicsPathData
 116 {
 117 public :
 118     wxCairoPathData(wxGraphicsRenderer* renderer, cairo_t* path = NULL);
 119     ~wxCairoPathData();
 120
 121     virtual wxGraphicsObjectRefData *Clone() const;
 122
 123     //
 124     // These are the path primitives from which everything else can be constructed
 125     //
 126
 127     // begins a new subpath at (x,y)
 128     virtual void MoveToPoint( wxDouble x, wxDouble y );
 129
 130     // adds a straight line from the current point to (x,y)
 131     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 132
 133     // adds a cubic Bezier curve from the current point, using two control points and an end point
 134     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );
 135
 136
 137     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 138     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) ;
 139
 140     // gets the last point of the current path, (0,0) if not yet set
 141     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 142
 143     // adds another path
 144     virtual void AddPath( const wxGraphicsPathData* path );
 145
 146     // closes the current sub-path
 147     virtual void CloseSubpath();
 148
 149     //
 150     // These are convenience functions which - if not available natively will be assembled
 151     // using the primitives from above
 152     //
 153
 154     /*
 155
 156     // appends a rectangle as a new closed subpath
 157     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) ;
 158     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 159     virtual void AddEllipsis( wxDouble x, wxDouble y, wxDouble w , wxDouble h ) ;
 160
 161     // 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)
 162     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )  ;
 163     */
 164
 165     // returns the native path
 166     virtual void * GetNativePath() const ;
 167
 168     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 169     virtual void UnGetNativePath(void *p) const;
 170
 171     // transforms each point of this path by the matrix
 172     virtual void Transform( const wxGraphicsMatrixData* matrix ) ;
 173
 174     // gets the bounding box enclosing all points (possibly including control points)
 175     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const;
 176
 177     virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxWINDING_RULE) const;
 178
 179 private :
 180     cairo_t* m_pathContext;
 181 };
 182
 183 class WXDLLIMPEXP_CORE wxCairoMatrixData : public wxGraphicsMatrixData
 184 {
 185 public :
 186     wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix = NULL ) ;
 187     virtual ~wxCairoMatrixData() ;
 188
 189     virtual wxGraphicsObjectRefData *Clone() const ;
 190
 191     // concatenates the matrix
 192     virtual void Concat( const wxGraphicsMatrixData *t );
 193
 194     // sets the matrix to the respective values
 195     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 196         wxDouble tx=0.0, wxDouble ty=0.0);
 197
 198     // gets the component valuess of the matrix
 199     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 200                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 201
 202     // makes this the inverse matrix
 203     virtual void Invert();
 204
 205     // returns true if the elements of the transformation matrix are equal ?
 206     virtual bool IsEqual( const wxGraphicsMatrixData* t) const ;
 207
 208     // return true if this is the identity matrix
 209     virtual bool IsIdentity() const;
 210
 211     //
 212     // transformation
 213     //
 214
 215     // add the translation to this matrix
 216     virtual void Translate( wxDouble dx , wxDouble dy );
 217
 218     // add the scale to this matrix
 219     virtual void Scale( wxDouble xScale , wxDouble yScale );
 220
 221     // add the rotation to this matrix (radians)
 222     virtual void Rotate( wxDouble angle );
 223
 224     //
 225     // apply the transforms
 226     //
 227
 228     // applies that matrix to the point
 229     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 230
 231     // applies the matrix except for translations
 232     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 233
 234     // returns the native representation
 235     virtual void * GetNativeMatrix() const;
 236 private:
 237     cairo_matrix_t m_matrix ;
 238 } ;
 239
 240 class WXDLLIMPEXP_CORE wxCairoPenData : public wxGraphicsObjectRefData
 241 {
 242 public:
 243     wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen );
 244     ~wxCairoPenData();
 245
 246     void Init();
 247
 248     virtual void Apply( wxGraphicsContext* context );
 249     virtual wxDouble GetWidth() { return m_width; }
 250
 251 private :
 252     double m_width;
 253
 254     double m_red;
 255     double m_green;
 256     double m_blue;
 257     double m_alpha;
 258
 259     cairo_line_cap_t m_cap;
 260     cairo_line_join_t m_join;
 261
 262     int m_count;
 263     const double *m_lengths;
 264     double *m_userLengths;
 265
 266     wxPen m_pen;
 267 };
 268
 269 class WXDLLIMPEXP_CORE wxCairoBrushData : public wxGraphicsObjectRefData
 270 {
 271 public:
 272     wxCairoBrushData( wxGraphicsRenderer* renderer );
 273     wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush );
 274     ~wxCairoBrushData ();
 275
 276     virtual void Apply( wxGraphicsContext* context );
 277     void CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 278         const wxColour&c1, const wxColour&c2 );
 279     void CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 280         const wxColour &oColor, const wxColour &cColor );
 281
 282 protected:
 283     virtual void Init();
 284
 285 private :
 286     double m_red;
 287     double m_green;
 288     double m_blue;
 289     double m_alpha;
 290
 291     cairo_pattern_t* m_brushPattern;
 292 };
 293
 294 class wxCairoFontData : public wxGraphicsObjectRefData
 295 {
 296 public:
 297     wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font, const wxColour& col );
 298     ~wxCairoFontData();
 299
 300     virtual void Apply( wxGraphicsContext* context );
 301 #ifdef __WXGTK__
 302     const PangoFontDescription* GetFont() const { return m_font; }
 303 #endif
 304 private :
 305     double m_size;
 306     double m_red;
 307     double m_green;
 308     double m_blue;
 309     double m_alpha;
 310 #ifdef __WXMAC__
 311     cairo_font_face_t *m_font;
 312 #elif defined(__WXGTK__)
 313     PangoFontDescription* m_font;
 314 #else
 315     wxCharBuffer m_fontName;
 316     cairo_font_slant_t m_slant;
 317     cairo_font_weight_t m_weight;
 318 #endif
 319 };
 320
 321 class WXDLLIMPEXP_CORE wxCairoContext : public wxGraphicsContext
 322 {
 323     DECLARE_NO_COPY_CLASS(wxCairoContext)
 324
 325 public:
 326     wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc );
 327     wxCairoContext( wxGraphicsRenderer* renderer, const wxMemoryDC& dc );
 328 #ifdef __WXGTK__
 329     wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable );
 330 #endif
 331     wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context );
 332     wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window);
 333     wxCairoContext();
 334     virtual ~wxCairoContext();
 335
 336     virtual bool ShouldOffset() const
 337     {
 338         int penwidth = 0 ;
 339         if ( !m_pen.IsNull() )
 340         {
 341             penwidth = (int)((wxCairoPenData*)m_pen.GetRefData())->GetWidth();
 342             if ( penwidth == 0 )
 343                 penwidth = 1;
 344         }
 345         return ( penwidth % 2 ) == 1;
 346     }
 347
 348     virtual void Clip( const wxRegion &region );
 349
 350     // clips drawings to the rect
 351     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 352
 353     // resets the clipping to original extent
 354     virtual void ResetClip();
 355
 356     virtual void * GetNativeContext();
 357
 358     virtual void StrokePath( const wxGraphicsPath& p );
 359     virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxWINDING_RULE );
 360
 361     virtual void Translate( wxDouble dx , wxDouble dy );
 362     virtual void Scale( wxDouble xScale , wxDouble yScale );
 363     virtual void Rotate( wxDouble angle );
 364
 365     // concatenates this transform with the current transform of this context
 366     virtual void ConcatTransform( const wxGraphicsMatrix& matrix );
 367
 368     // sets the transform of this context
 369     virtual void SetTransform( const wxGraphicsMatrix& matrix );
 370
 371     // gets the matrix of this context
 372     virtual wxGraphicsMatrix GetTransform() const;
 373
 374     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 375     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 376     virtual void PushState();
 377     virtual void PopState();
 378
 379     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y);
 380     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
 381                                 wxDouble *descent, wxDouble *externalLeading ) const;
 382     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
 383
 384 private:
 385     void Init(cairo_t *context);
 386
 387     cairo_t* m_context;
 388 };
 389
 390 //-----------------------------------------------------------------------------
 391 // wxCairoPenData implementation
 392 //-----------------------------------------------------------------------------
 393
 394 wxCairoPenData::~wxCairoPenData()
 395 {
 396     delete[] m_userLengths;
 397 }
 398
 399 void wxCairoPenData::Init()
 400 {
 401     m_lengths = NULL;
 402     m_userLengths = NULL;
 403     m_width = 0;
 404     m_count = 0;
 405 }
 406
 407 wxCairoPenData::wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen )
 408 : wxGraphicsObjectRefData(renderer)
 409 {
 410     Init();
 411     m_pen = pen;
 412     m_width = m_pen.GetWidth();
 413     if (m_width <= 0.0)
 414         m_width = 0.1;
 415
 416     m_red = m_pen.GetColour().Red()/255.0;
 417     m_green = m_pen.GetColour().Green()/255.0;
 418     m_blue = m_pen.GetColour().Blue()/255.0;
 419     m_alpha = m_pen.GetColour().Alpha()/255.0;
 420
 421     switch ( m_pen.GetCap() )
 422     {
 423     case wxCAP_ROUND :
 424         m_cap = CAIRO_LINE_CAP_ROUND;
 425         break;
 426
 427     case wxCAP_PROJECTING :
 428         m_cap = CAIRO_LINE_CAP_SQUARE;
 429         break;
 430
 431     case wxCAP_BUTT :
 432         m_cap = CAIRO_LINE_CAP_BUTT;
 433         break;
 434
 435     default :
 436         m_cap = CAIRO_LINE_CAP_BUTT;
 437         break;
 438     }
 439
 440     switch ( m_pen.GetJoin() )
 441     {
 442     case wxJOIN_BEVEL :
 443         m_join = CAIRO_LINE_JOIN_BEVEL;
 444         break;
 445
 446     case wxJOIN_MITER :
 447         m_join = CAIRO_LINE_JOIN_MITER;
 448         break;
 449
 450     case wxJOIN_ROUND :
 451         m_join = CAIRO_LINE_JOIN_ROUND;
 452         break;
 453
 454     default :
 455         m_join = CAIRO_LINE_JOIN_MITER;
 456         break;
 457     }
 458
 459     const double dashUnit = m_width < 1.0 ? 1.0 : m_width;
 460     const double dotted[] =
 461     {
 462         dashUnit , dashUnit + 2.0
 463     };
 464     static const double short_dashed[] =
 465     {
 466         9.0 , 6.0
 467     };
 468     static const double dashed[] =
 469     {
 470         19.0 , 9.0
 471     };
 472     static const double dotted_dashed[] =
 473     {
 474         9.0 , 6.0 , 3.0 , 3.0
 475     };
 476
 477     switch ( m_pen.GetStyle() )
 478     {
 479     case wxSOLID :
 480         break;
 481
 482     case wxDOT :
 483         m_count = WXSIZEOF(dotted);
 484         m_userLengths = new double[ m_count ] ;
 485         memcpy( m_userLengths, dotted, sizeof(dotted) );
 486         m_lengths = m_userLengths;
 487         break;
 488
 489     case wxLONG_DASH :
 490         m_lengths = dashed ;
 491         m_count = WXSIZEOF(dashed);
 492         break;
 493
 494     case wxSHORT_DASH :
 495         m_lengths = short_dashed ;
 496         m_count = WXSIZEOF(short_dashed);
 497         break;
 498
 499     case wxDOT_DASH :
 500         m_lengths = dotted_dashed ;
 501         m_count = WXSIZEOF(dotted_dashed);
 502         break;
 503
 504     case wxUSER_DASH :
 505         {
 506             wxDash *wxdashes ;
 507             m_count = m_pen.GetDashes( &wxdashes ) ;
 508             if ((wxdashes != NULL) && (m_count > 0))
 509             {
 510                 m_userLengths = new double[m_count] ;
 511                 for ( int i = 0 ; i < m_count ; ++i )
 512                 {
 513                     m_userLengths[i] = wxdashes[i] * dashUnit ;
 514
 515                     if ( i % 2 == 1 && m_userLengths[i] < dashUnit + 2.0 )
 516                         m_userLengths[i] = dashUnit + 2.0 ;
 517                     else if ( i % 2 == 0 && m_userLengths[i] < dashUnit )
 518                         m_userLengths[i] = dashUnit ;
 519                 }
 520             }
 521             m_lengths = m_userLengths ;
 522         }
 523         break;
 524     case wxSTIPPLE :
 525         {
 526             /*
 527             wxBitmap* bmp = pen.GetStipple();
 528             if ( bmp && bmp->Ok() )
 529             {
 530             wxDELETE( m_penImage );
 531             wxDELETE( m_penBrush );
 532             m_penImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 533             m_penBrush = new TextureBrush(m_penImage);
 534             m_pen->SetBrush( m_penBrush );
 535             }
 536             */
 537         }
 538         break;
 539     default :
 540         if ( m_pen.GetStyle() >= wxFIRST_HATCH && m_pen.GetStyle() <= wxLAST_HATCH )
 541         {
 542             /*
 543             wxDELETE( m_penBrush );
 544             HatchStyle style = HatchStyleHorizontal;
 545             switch( pen.GetStyle() )
 546             {
 547             case wxBDIAGONAL_HATCH :
 548             style = HatchStyleBackwardDiagonal;
 549             break ;
 550             case wxCROSSDIAG_HATCH :
 551             style = HatchStyleDiagonalCross;
 552             break ;
 553             case wxFDIAGONAL_HATCH :
 554             style = HatchStyleForwardDiagonal;
 555             break ;
 556             case wxCROSS_HATCH :
 557             style = HatchStyleCross;
 558             break ;
 559             case wxHORIZONTAL_HATCH :
 560             style = HatchStyleHorizontal;
 561             break ;
 562             case wxVERTICAL_HATCH :
 563             style = HatchStyleVertical;
 564             break ;
 565
 566             }
 567             m_penBrush = new HatchBrush(style,Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
 568             pen.GetColour().Green() , pen.GetColour().Blue() ), Color.Transparent );
 569             m_pen->SetBrush( m_penBrush )
 570             */
 571         }
 572         break;
 573     }
 574 }
 575
 576 void wxCairoPenData::Apply( wxGraphicsContext* context )
 577 {
 578     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 579     cairo_set_line_width(ctext,m_width);
 580     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 581     cairo_set_line_cap(ctext,m_cap);
 582     cairo_set_line_join(ctext,m_join);
 583     cairo_set_dash(ctext,(double*)m_lengths,m_count,0.0);
 584 }
 585
 586 //-----------------------------------------------------------------------------
 587 // wxCairoBrushData implementation
 588 //-----------------------------------------------------------------------------
 589
 590 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer )
 591   : wxGraphicsObjectRefData( renderer )
 592 {
 593     Init();
 594 }
 595
 596 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush )
 597   : wxGraphicsObjectRefData(renderer)
 598 {
 599     Init();
 600
 601     m_red = brush.GetColour().Red()/255.0;
 602     m_green = brush.GetColour().Green()/255.0;
 603     m_blue = brush.GetColour().Blue()/255.0;
 604     m_alpha = brush.GetColour().Alpha()/255.0;
 605     /*
 606     if ( brush.GetStyle() == wxSOLID)
 607     {
 608     m_brush = new SolidBrush( Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 609     brush.GetColour().Green() , brush.GetColour().Blue() ) );
 610     }
 611     else if ( brush.IsHatch() )
 612     {
 613     HatchStyle style = HatchStyleHorizontal;
 614     switch( brush.GetStyle() )
 615     {
 616     case wxBDIAGONAL_HATCH :
 617     style = HatchStyleBackwardDiagonal;
 618     break ;
 619     case wxCROSSDIAG_HATCH :
 620     style = HatchStyleDiagonalCross;
 621     break ;
 622     case wxFDIAGONAL_HATCH :
 623     style = HatchStyleForwardDiagonal;
 624     break ;
 625     case wxCROSS_HATCH :
 626     style = HatchStyleCross;
 627     break ;
 628     case wxHORIZONTAL_HATCH :
 629     style = HatchStyleHorizontal;
 630     break ;
 631     case wxVERTICAL_HATCH :
 632     style = HatchStyleVertical;
 633     break ;
 634
 635     }
 636     m_brush = new HatchBrush(style,Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 637     brush.GetColour().Green() , brush.GetColour().Blue() ), Color.Transparent );
 638     }
 639     else
 640     {
 641     wxBitmap* bmp = brush.GetStipple();
 642     if ( bmp && bmp->Ok() )
 643     {
 644     wxDELETE( m_brushImage );
 645     m_brushImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 646     m_brush = new TextureBrush(m_brushImage);
 647     }
 648     }
 649     */
 650 }
 651
 652 wxCairoBrushData::~wxCairoBrushData ()
 653 {
 654     if (m_brushPattern)
 655         cairo_pattern_destroy(m_brushPattern);
 656 }
 657
 658 void wxCairoBrushData::Apply( wxGraphicsContext* context )
 659 {
 660     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 661     if ( m_brushPattern )
 662     {
 663         cairo_set_source(ctext,m_brushPattern);
 664     }
 665     else
 666     {
 667         cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 668     }
 669 }
 670
 671 void wxCairoBrushData::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 672         const wxColour&c1, const wxColour&c2 )
 673 {
 674     m_brushPattern = cairo_pattern_create_linear(x1,y1,x2,y2);
 675     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,c1.Red()/255.0,
 676         c1.Green()/255.0, c1.Blue()/255.0,c1.Alpha()/255.0);
 677     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,c2.Red()/255.0,
 678         c2.Green()/255.0, c2.Blue()/255.0,c2.Alpha()/255.0);
 679     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 680 }
 681
 682 void wxCairoBrushData::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 683         const wxColour &oColor, const wxColour &cColor )
 684 {
 685     m_brushPattern = cairo_pattern_create_radial(xo,yo,0.0,xc,yc,radius);
 686     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,oColor.Red()/255.0,
 687         oColor.Green()/255.0, oColor.Blue()/255.0,oColor.Alpha()/255.0);
 688     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,cColor.Red()/255.0,
 689         cColor.Green()/255.0, cColor.Blue()/255.0,cColor.Alpha()/255.0);
 690     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 691 }
 692
 693 void wxCairoBrushData::Init()
 694 {
 695     m_brushPattern = NULL;
 696 }
 697
 698 //-----------------------------------------------------------------------------
 699 // wxCairoFontData implementation
 700 //-----------------------------------------------------------------------------
 701
 702 wxCairoFontData::wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font,
 703                          const wxColour& col ) : wxGraphicsObjectRefData(renderer)
 704 {
 705     m_red = col.Red()/255.0;
 706     m_green = col.Green()/255.0;
 707     m_blue = col.Blue()/255.0;
 708     m_alpha = col.Alpha()/255.0;
 709     m_size = font.GetPointSize();
 710
 711 #ifdef __WXMAC__
 712     m_font = cairo_atsui_font_face_create_for_atsu_font_id( font.MacGetATSUFontID() );
 713 #elif defined(__WXGTK__)
 714     m_font = pango_font_description_copy( font.GetNativeFontInfo()->description );
 715 #else
 716     m_fontName = font.GetFaceName().mb_str(wxConvUTF8);
 717     m_slant = font.GetStyle() == wxFONTSTYLE_ITALIC ? CAIRO_FONT_SLANT_ITALIC:CAIRO_FONT_SLANT_NORMAL;
 718     m_weight = font.GetWeight() == wxFONTWEIGHT_BOLD ? CAIRO_FONT_WEIGHT_BOLD:CAIRO_FONT_WEIGHT_NORMAL;
 719 #endif
 720 }
 721
 722 wxCairoFontData::~wxCairoFontData()
 723 {
 724 #ifdef __WXMAC__
 725     cairo_font_face_destroy( m_font );
 726 #elif defined(__WXGTK__)
 727     pango_font_description_free( m_font );
 728 #else
 729 #endif
 730 }
 731
 732 void wxCairoFontData::Apply( wxGraphicsContext* context )
 733 {
 734     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 735     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 736 #ifdef __WXGTK__
 737     // the rest is done using Pango layouts
 738 #elif defined(__WXMAC__)
 739     cairo_set_font_face(ctext, m_font);
 740     cairo_set_font_size(ctext, m_size );
 741 #else
 742     cairo_select_font_face(ctext, m_fontName, m_slant, m_weights );
 743     cairo_set_font_size(ctext, m_size );
 744 #endif
 745 }
 746
 747 //-----------------------------------------------------------------------------
 748 // wxCairoPathData implementation
 749 //-----------------------------------------------------------------------------
 750
 751 wxCairoPathData::wxCairoPathData( wxGraphicsRenderer* renderer, cairo_t* pathcontext)
 752     : wxGraphicsPathData(renderer)
 753 {
 754     if (pathcontext)
 755     {
 756         m_pathContext = pathcontext;
 757     }
 758     else
 759     {
 760         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 761         m_pathContext = cairo_create(surface);
 762         cairo_surface_destroy (surface);
 763     }
 764 }
 765
 766 wxCairoPathData::~wxCairoPathData()
 767 {
 768     cairo_destroy(m_pathContext);
 769 }
 770
 771 wxGraphicsObjectRefData *wxCairoPathData::Clone() const
 772 {
 773     cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 774     cairo_t* pathcontext = cairo_create(surface);
 775     cairo_surface_destroy (surface);
 776
 777     cairo_path_t* path = cairo_copy_path(m_pathContext);
 778     cairo_append_path(pathcontext, path);
 779     cairo_path_destroy(path);
 780     return new wxCairoPathData( GetRenderer() ,pathcontext);
 781 }
 782
 783
 784 void* wxCairoPathData::GetNativePath() const
 785 {
 786     return cairo_copy_path(m_pathContext) ;
 787 }
 788
 789 void wxCairoPathData::UnGetNativePath(void *p) const
 790 {
 791     cairo_path_destroy((cairo_path_t*)p);
 792 }
 793
 794 //
 795 // The Primitives
 796 //
 797
 798 void wxCairoPathData::MoveToPoint( wxDouble x , wxDouble y )
 799 {
 800     cairo_move_to(m_pathContext,x,y);
 801 }
 802
 803 void wxCairoPathData::AddLineToPoint( wxDouble x , wxDouble y )
 804 {
 805     cairo_line_to(m_pathContext,x,y);
 806 }
 807
 808 void wxCairoPathData::AddPath( const wxGraphicsPathData* path )
 809 {
 810     cairo_path_t* p = (cairo_path_t*)path->GetNativePath();
 811     cairo_append_path(m_pathContext, p);
 812     UnGetNativePath(p);
 813 }
 814
 815 void wxCairoPathData::CloseSubpath()
 816 {
 817     cairo_close_path(m_pathContext);
 818 }
 819
 820 void wxCairoPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 821 {
 822     cairo_curve_to(m_pathContext,cx1,cy1,cx2,cy2,x,y);
 823 }
 824
 825 // gets the last point of the current path, (0,0) if not yet set
 826 void wxCairoPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 827 {
 828     double dx,dy;
 829     cairo_get_current_point(m_pathContext,&dx,&dy);
 830     if (x)
 831         *x = dx;
 832     if (y)
 833         *y = dy;
 834 }
 835
 836 void wxCairoPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, double startAngle, double endAngle, bool clockwise )
 837 {
 838     // as clockwise means positive in our system (y pointing downwards)
 839     // TODO make this interpretation dependent of the
 840     // real device trans
 841     if ( clockwise||(endAngle-startAngle)>=2*M_PI)
 842         cairo_arc(m_pathContext,x,y,r,startAngle,endAngle);
 843     else
 844         cairo_arc_negative(m_pathContext,x,y,r,startAngle,endAngle);
 845 }
 846
 847 // transforms each point of this path by the matrix
 848 void wxCairoPathData::Transform( const wxGraphicsMatrixData* matrix )
 849 {
 850     // as we don't have a true path object, we have to apply the inverse
 851     // matrix to the context
 852     cairo_matrix_t m = *((cairo_matrix_t*) matrix->GetNativeMatrix());
 853     cairo_matrix_invert( &m );
 854     cairo_transform(m_pathContext,&m);
 855 }
 856
 857 // gets the bounding box enclosing all points (possibly including control points)
 858 void wxCairoPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 859 {
 860     double x1,y1,x2,y2;
 861
 862     cairo_stroke_extents( m_pathContext, &x1, &y1, &x2, &y2 );
 863     if ( x2 < x1 )
 864     {
 865         *x = x2;
 866         *w = x1-x2;
 867     }
 868     else
 869     {
 870         *x = x1;
 871         *w = x2-x1;
 872     }
 873
 874     if( y2 < y1 )
 875     {
 876         *y = y2;
 877         *h = y1-y2;
 878     }
 879     else
 880     {
 881         *y = y1;
 882         *h = y2-y1;
 883     }
 884 }
 885
 886 bool wxCairoPathData::Contains( wxDouble x, wxDouble y, int WXUNUSED(fillStyle) ) const
 887 {
 888     return cairo_in_stroke( m_pathContext, x, y) != 0;
 889 }
 890
 891 //-----------------------------------------------------------------------------
 892 // wxCairoMatrixData implementation
 893 //-----------------------------------------------------------------------------
 894
 895 wxCairoMatrixData::wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix )
 896     : wxGraphicsMatrixData(renderer)
 897 {
 898     if ( matrix )
 899         m_matrix = *matrix;
 900 }
 901
 902 wxCairoMatrixData::~wxCairoMatrixData()
 903 {
 904     // nothing to do
 905 }
 906
 907 wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 908 {
 909     return new wxCairoMatrixData(GetRenderer(),&m_matrix);
 910 }
 911
 912 // concatenates the matrix
 913 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 914 {
 915     cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
 916 }
 917
 918 // sets the matrix to the respective values
 919 void wxCairoMatrixData::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 920                         wxDouble tx, wxDouble ty)
 921 {
 922     cairo_matrix_init( &m_matrix, a, b, c, d, tx, ty);
 923 }
 924
 925 // gets the component valuess of the matrix
 926 void wxCairoMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
 927                             wxDouble* d, wxDouble* tx, wxDouble* ty) const
 928 {
 929     if (a)  *a = m_matrix.xx;
 930     if (b)  *b = m_matrix.yx;
 931     if (c)  *c = m_matrix.xy;
 932     if (d)  *d = m_matrix.yy;
 933     if (tx) *tx= m_matrix.x0;
 934     if (ty) *ty= m_matrix.y0;
 935 }
 936
 937 // makes this the inverse matrix
 938 void wxCairoMatrixData::Invert()
 939 {
 940     cairo_matrix_invert( &m_matrix );
 941 }
 942
 943 // returns true if the elements of the transformation matrix are equal ?
 944 bool wxCairoMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
 945 {
 946     const cairo_matrix_t* tm = (cairo_matrix_t*) t->GetNativeMatrix();
 947     return (
 948         m_matrix.xx == tm->xx &&
 949         m_matrix.yx == tm->yx &&
 950         m_matrix.xy == tm->xy &&
 951         m_matrix.yy == tm->yy &&
 952         m_matrix.x0 == tm->x0 &&
 953         m_matrix.y0 == tm->y0 ) ;
 954 }
 955
 956 // return true if this is the identity matrix
 957 bool wxCairoMatrixData::IsIdentity() const
 958 {
 959     return ( m_matrix.xx == 1 && m_matrix.yy == 1 &&
 960         m_matrix.yx == 0 && m_matrix.xy == 0 && m_matrix.x0 == 0 && m_matrix.y0 == 0);
 961 }
 962
 963 //
 964 // transformation
 965 //
 966
 967 // add the translation to this matrix
 968 void wxCairoMatrixData::Translate( wxDouble dx , wxDouble dy )
 969 {
 970     cairo_matrix_translate( &m_matrix, dx, dy) ;
 971 }
 972
 973 // add the scale to this matrix
 974 void wxCairoMatrixData::Scale( wxDouble xScale , wxDouble yScale )
 975 {
 976     cairo_matrix_scale( &m_matrix, xScale, yScale) ;
 977 }
 978
 979 // add the rotation to this matrix (radians)
 980 void wxCairoMatrixData::Rotate( wxDouble angle )
 981 {
 982     cairo_matrix_rotate( &m_matrix, angle) ;
 983 }
 984
 985 //
 986 // apply the transforms
 987 //
 988
 989 // applies that matrix to the point
 990 void wxCairoMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
 991 {
 992     double lx = *x, ly = *y ;
 993     cairo_matrix_transform_point( &m_matrix, &lx, &ly);
 994     *x = lx;
 995     *y = ly;
 996 }
 997
 998 // applies the matrix except for translations
 999 void wxCairoMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
1000 {
1001     double lx = *dx, ly = *dy ;
1002     cairo_matrix_transform_distance( &m_matrix, &lx, &ly);
1003     *dx = lx;
1004     *dy = ly;
1005 }
1006
1007 // returns the native representation
1008 void * wxCairoMatrixData::GetNativeMatrix() const
1009 {
1010     return (void*) &m_matrix;
1011 }
1012
1013 //-----------------------------------------------------------------------------
1014 // wxCairoContext implementation
1015 //-----------------------------------------------------------------------------
1016
1017 class wxCairoOffsetHelper
1018 {
1019 public :
1020     wxCairoOffsetHelper( cairo_t* ctx , bool offset )
1021     {
1022         m_ctx = ctx;
1023         m_offset = offset;
1024         if ( m_offset )
1025              cairo_translate( m_ctx, 0.5, 0.5 );
1026     }
1027     ~wxCairoOffsetHelper( )
1028     {
1029         if ( m_offset )
1030             cairo_translate( m_ctx, -0.5, -0.5 );
1031     }
1032 public :
1033     cairo_t* m_ctx;
1034     bool m_offset;
1035 } ;
1036
1037 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
1038 : wxGraphicsContext(renderer)
1039 {
1040 #ifdef __WXGTK__
1041     wxGTKDCImpl *impldc = (wxGTKDCImpl*) dc.GetImpl();
1042     Init( gdk_cairo_create( impldc->GetGDKWindow() ) );
1043 #endif
1044 #ifdef __WXMAC__
1045     int width, height;
1046     dc.GetSize( &width, &height );
1047     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1048     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1049     Init( cairo_create( surface ) );
1050     cairo_surface_destroy( surface );
1051 #endif
1052 }
1053
1054 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxMemoryDC& dc )
1055 : wxGraphicsContext(renderer)
1056 {
1057 #ifdef __WXGTK__
1058     wxGTKDCImpl *impldc = (wxGTKDCImpl*) dc.GetImpl();
1059     Init( gdk_cairo_create( impldc->GetGDKWindow() ) );
1060 #endif
1061 #ifdef __WXMAC__
1062     int width, height;
1063     dc.GetSize( &width, &height );
1064     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1065     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1066     Init( cairo_create( surface ) );
1067     cairo_surface_destroy( surface );
1068 #endif
1069 }
1070
1071 #ifdef __WXGTK__
1072 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable )
1073 : wxGraphicsContext(renderer)
1074 {
1075     Init( gdk_cairo_create( drawable ) );
1076 }
1077 #endif
1078
1079 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
1080 : wxGraphicsContext(renderer)
1081 {
1082     Init( context );
1083 }
1084
1085 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
1086 : wxGraphicsContext(renderer)
1087 {
1088 #ifdef __WXGTK__
1089     // something along these lines (copied from dcclient)
1090
1091     // Some controls don't have m_wxwindow - like wxStaticBox, but the user
1092     // code should still be able to create wxClientDCs for them, so we will
1093     // use the parent window here then.
1094     if (window->m_wxwindow == NULL)
1095     {
1096         window = window->GetParent();
1097     }
1098
1099     wxASSERT_MSG( window->m_wxwindow, wxT("wxCairoContext needs a widget") );
1100
1101     Init(gdk_cairo_create(window->GTKGetDrawingWindow()));
1102 #endif
1103 }
1104
1105 wxCairoContext::~wxCairoContext()
1106 {
1107     if ( m_context )
1108     {
1109         PopState();
1110         PopState();
1111         cairo_destroy(m_context);
1112     }
1113 }
1114
1115 void wxCairoContext::Init(cairo_t *context)
1116 {
1117     m_context = context ;
1118     PushState();
1119     PushState();
1120 }
1121
1122
1123 void wxCairoContext::Clip( const wxRegion& region )
1124 {
1125     // Create a path with all the rectangles in the region
1126     wxGraphicsPath path = GetRenderer()->CreatePath();
1127     wxRegionIterator ri(region);
1128     while (ri)
1129     {
1130         path.AddRectangle(ri.GetX(), ri.GetY(), ri.GetW(), ri.GetH());
1131         ++ri;
1132     }
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::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1144 {
1145     // Create a path with this rectangle
1146     wxGraphicsPath path = GetRenderer()->CreatePath();
1147     path.AddRectangle(x,y,w,h);
1148
1149     // Put it in the context
1150     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1151     cairo_append_path(m_context, cp);
1152
1153     // clip to that path
1154     cairo_clip(m_context);
1155     path.UnGetNativePath(cp);
1156 }
1157
1158 void wxCairoContext::ResetClip()
1159 {
1160     cairo_reset_clip(m_context);
1161 }
1162
1163
1164 void wxCairoContext::StrokePath( const wxGraphicsPath& path )
1165 {
1166     if ( !m_pen.IsNull() )
1167     {
1168         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1169         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1170         cairo_append_path(m_context,cp);
1171         ((wxCairoPenData*)m_pen.GetRefData())->Apply(this);
1172         cairo_stroke(m_context);
1173         path.UnGetNativePath(cp);
1174     }
1175 }
1176
1177 void wxCairoContext::FillPath( const wxGraphicsPath& path , int fillStyle )
1178 {
1179     if ( !m_brush.IsNull() )
1180     {
1181         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1182         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1183         cairo_append_path(m_context,cp);
1184         ((wxCairoBrushData*)m_brush.GetRefData())->Apply(this);
1185         cairo_set_fill_rule(m_context,fillStyle==wxODDEVEN_RULE ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
1186         cairo_fill(m_context);
1187         path.UnGetNativePath(cp);
1188     }
1189 }
1190
1191 void wxCairoContext::Rotate( wxDouble angle )
1192 {
1193     cairo_rotate(m_context,angle);
1194 }
1195
1196 void wxCairoContext::Translate( wxDouble dx , wxDouble dy )
1197 {
1198     cairo_translate(m_context,dx,dy);
1199 }
1200
1201 void wxCairoContext::Scale( wxDouble xScale , wxDouble yScale )
1202 {
1203     cairo_scale(m_context,xScale,yScale);
1204 }
1205
1206 // concatenates this transform with the current transform of this context
1207 void wxCairoContext::ConcatTransform( const wxGraphicsMatrix& matrix )
1208 {
1209     cairo_transform(m_context,(const cairo_matrix_t *) matrix.GetNativeMatrix());
1210 }
1211
1212 // sets the transform of this context
1213 void wxCairoContext::SetTransform( const wxGraphicsMatrix& matrix )
1214 {
1215     cairo_set_matrix(m_context,(const cairo_matrix_t*) matrix.GetNativeMatrix());
1216 }
1217
1218 // gets the matrix of this context
1219 wxGraphicsMatrix wxCairoContext::GetTransform() const
1220 {
1221     wxGraphicsMatrix matrix = CreateMatrix();
1222     cairo_get_matrix(m_context,(cairo_matrix_t*) matrix.GetNativeMatrix());
1223     return matrix;
1224 }
1225
1226
1227
1228 void wxCairoContext::PushState()
1229 {
1230     cairo_save(m_context);
1231 }
1232
1233 void wxCairoContext::PopState()
1234 {
1235     cairo_restore(m_context);
1236 }
1237
1238 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1239 {
1240     wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
1241
1242     cairo_surface_t* surface;
1243     int bw = bmp.GetWidth();
1244     int bh = bmp.GetHeight();
1245     wxBitmap bmpSource = bmp;  // we need a non-const instance
1246     unsigned char* buffer = new unsigned char[bw*bh*4];
1247     wxUint32* data = (wxUint32*)buffer;
1248
1249     // Create a surface object and copy the bitmap pixel data to it.  if the
1250     // image has alpha (or a mask represented as alpha) then we'll use a
1251     // different format and iterator than if it doesn't...
1252     if (bmpSource.HasAlpha() || bmpSource.GetMask())
1253     {
1254         surface = cairo_image_surface_create_for_data(
1255             buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
1256         wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1257         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1258
1259         wxAlphaPixelData::Iterator p(pixData);
1260         for (int y=0; y<bh; y++)
1261         {
1262             wxAlphaPixelData::Iterator rowStart = p;
1263             for (int x=0; x<bw; x++)
1264             {
1265                 // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
1266                 // with alpha in the upper 8 bits, then red, then green, then
1267                 // blue. The 32-bit quantities are stored native-endian.
1268                 // Pre-multiplied alpha is used.
1269                 unsigned char alpha = p.Alpha();
1270                 if (alpha == 0)
1271                     *data = 0;
1272                 else
1273                     *data = ( alpha                      << 24
1274                               | (p.Red() * alpha/255)    << 16
1275                               | (p.Green() * alpha/255)  <<  8
1276                               | (p.Blue() * alpha/255) );
1277                 ++data;
1278                 ++p;
1279             }
1280             p = rowStart;
1281             p.OffsetY(pixData, 1);
1282         }
1283     }
1284     else  // no alpha
1285     {
1286         surface = cairo_image_surface_create_for_data(
1287             buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
1288         wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1289         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1290
1291         wxNativePixelData::Iterator p(pixData);
1292         for (int y=0; y<bh; y++)
1293         {
1294             wxNativePixelData::Iterator rowStart = p;
1295             for (int x=0; x<bw; x++)
1296             {
1297                 // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
1298                 // the upper 8 bits unused. Red, Green, and Blue are stored in
1299                 // the remaining 24 bits in that order.  The 32-bit quantities
1300                 // are stored native-endian.
1301                 *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
1302                 ++data;
1303                 ++p;
1304             }
1305             p = rowStart;
1306             p.OffsetY(pixData, 1);
1307         }
1308     }
1309
1310
1311     PushState();
1312
1313     // In case we're scaling the image by using a width and height different
1314     // than the bitmap's size create a pattern transformation on the surface and
1315     // draw the transformed pattern.
1316     cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
1317     wxDouble scaleX = w / bw;
1318     wxDouble scaleY = h / bh;
1319     cairo_scale(m_context, scaleX, scaleY);
1320
1321     // prepare to draw the image
1322     cairo_translate(m_context, x, y);
1323     cairo_set_source(m_context, pattern);
1324     // use the original size here since the context is scaled already...
1325     cairo_rectangle(m_context, 0, 0, bw, bh);
1326     // fill the rectangle using the pattern
1327     cairo_fill(m_context);
1328
1329     // clean up
1330     cairo_pattern_destroy(pattern);
1331     cairo_surface_destroy(surface);
1332     delete [] buffer;
1333     PopState();
1334 }
1335
1336 void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1337 {
1338     // An icon is a bitmap on wxGTK, so do this the easy way.  When we want to
1339     // start using the Cairo backend on other platforms then we may need to
1340     // fiddle with this...
1341     DrawBitmap(icon, x, y, w, h);
1342 }
1343
1344
1345 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
1346 {
1347     if ( m_font.IsNull() || str.empty())
1348         return;
1349
1350 #ifdef __WXGTK__
1351     const wxCharBuffer data = str.utf8_str();
1352     if ( !data )
1353         return;
1354     size_t datalen = strlen(data);
1355     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1356
1357     PangoLayout *layout = pango_cairo_create_layout (m_context);
1358     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1359     pango_layout_set_text(layout, data, datalen);
1360     cairo_move_to(m_context, x, y);
1361     pango_cairo_show_layout (m_context, layout);
1362
1363     g_object_unref (layout);
1364 #else
1365     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1366     // Cairo's x,y for drawing text is at the baseline, so we need to adjust
1367     // the position we move to by the ascent.
1368     cairo_font_extents_t fe;
1369     cairo_font_extents(m_context, &fe);
1370     cairo_move_to(m_context, x, y+fe.ascent);
1371
1372     const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1373     cairo_show_text(m_context,buf);
1374 #endif
1375 }
1376
1377 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
1378                                     wxDouble *descent, wxDouble *externalLeading ) const
1379 {
1380     if ( width )
1381         *width = 0;
1382     if ( height )
1383         *height = 0;
1384     if ( descent )
1385         *descent = 0;
1386     if ( externalLeading )
1387         *externalLeading = 0;
1388
1389     if ( m_font.IsNull() || str.empty())
1390         return;
1391
1392 #ifdef __WXGTK__
1393     int w, h;
1394
1395     PangoLayout *layout = pango_cairo_create_layout (m_context);
1396     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1397     const wxCharBuffer data = str.utf8_str();
1398     if ( !data )
1399     {
1400         return;
1401     }
1402     pango_layout_set_text( layout, data, strlen(data) );
1403     pango_layout_get_pixel_size (layout, &w, &h);
1404     if ( width )
1405         *width = w;
1406     if ( height )
1407         *height = h;
1408     if (descent)
1409     {
1410         PangoLayoutIter *iter = pango_layout_get_iter(layout);
1411         int baseline = pango_layout_iter_get_baseline(iter);
1412         pango_layout_iter_free(iter);
1413         *descent = h - PANGO_PIXELS(baseline);
1414     }
1415     g_object_unref (layout);
1416 #else
1417     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
1418
1419     if (width)
1420     {
1421         const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1422         cairo_text_extents_t te;
1423         cairo_text_extents(m_context, buf, &te);
1424         *width = te.width;
1425     }
1426
1427     if (height || descent || externalLeading)
1428     {
1429         cairo_font_extents_t fe;
1430         cairo_font_extents(m_context, &fe);
1431
1432         // some backends have negative descents
1433
1434         if ( fe.descent < 0 )
1435             fe.descent = -fe.descent;
1436
1437         if ( fe.height < (fe.ascent + fe.descent ) )
1438         {
1439             // some backends are broken re height ... (eg currently ATSUI)
1440             fe.height = fe.ascent + fe.descent;
1441         }
1442
1443         if (height)
1444             *height = fe.height;
1445         if ( descent )
1446             *descent = fe.descent;
1447         if ( externalLeading )
1448             *externalLeading = wxMax(0, fe.height - (fe.ascent + fe.descent));
1449     }
1450 #endif
1451 }
1452
1453 void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
1454 {
1455     widths.Empty();
1456     widths.Add(0, text.length());
1457
1458     if (text.empty())
1459         return;
1460
1461     // TODO
1462 }
1463
1464 void * wxCairoContext::GetNativeContext()
1465 {
1466     return m_context;
1467 }
1468
1469 //-----------------------------------------------------------------------------
1470 // wxCairoRenderer declaration
1471 //-----------------------------------------------------------------------------
1472
1473 class WXDLLIMPEXP_CORE wxCairoRenderer : public wxGraphicsRenderer
1474 {
1475 public :
1476     wxCairoRenderer() {}
1477
1478     virtual ~wxCairoRenderer() {}
1479
1480     // Context
1481
1482     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);
1483     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
1484
1485     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
1486
1487     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
1488
1489     virtual wxGraphicsContext * CreateContext( wxWindow* window );
1490
1491     virtual wxGraphicsContext * CreateMeasuringContext();
1492
1493     // Path
1494
1495     virtual wxGraphicsPath CreatePath();
1496
1497     // Matrix
1498
1499     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
1500         wxDouble tx=0.0, wxDouble ty=0.0);
1501
1502
1503     virtual wxGraphicsPen CreatePen(const wxPen& pen) ;
1504
1505     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
1506
1507     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1508     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1509         const wxColour&c1, const wxColour&c2) ;
1510
1511     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1512     // with radius r and color cColor
1513     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1514         const wxColour &oColor, const wxColour &cColor) ;
1515
1516     // sets the font
1517     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
1518
1519 private :
1520     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
1521 } ;
1522
1523 //-----------------------------------------------------------------------------
1524 // wxCairoRenderer implementation
1525 //-----------------------------------------------------------------------------
1526
1527 IMPLEMENT_DYNAMIC_CLASS(wxCairoRenderer,wxGraphicsRenderer)
1528
1529 static wxCairoRenderer gs_cairoGraphicsRenderer;
1530 // temporary hack to allow creating a cairo context on any platform
1531 extern wxGraphicsRenderer* gCairoRenderer;
1532 wxGraphicsRenderer* gCairoRenderer = &gs_cairoGraphicsRenderer;
1533
1534 #ifdef __WXGTK__
1535 wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
1536 {
1537     return &gs_cairoGraphicsRenderer;
1538 }
1539 #endif
1540
1541 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
1542 {
1543     return new wxCairoContext(this,dc);
1544 }
1545
1546 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxMemoryDC& dc)
1547 {
1548     return new wxCairoContext(this,dc);
1549 }
1550
1551 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeContext( void * context )
1552 {
1553     return new wxCairoContext(this,(cairo_t*)context);
1554 }
1555
1556
1557 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeWindow( void * window )
1558 {
1559 #ifdef __WXGTK__
1560     return new wxCairoContext(this,(GdkDrawable*)window);
1561 #else
1562     return NULL;
1563 #endif
1564 }
1565
1566 wxGraphicsContext * wxCairoRenderer::CreateMeasuringContext()
1567 {
1568     return NULL;
1569     // TODO
1570 }
1571
1572 wxGraphicsContext * wxCairoRenderer::CreateContext( wxWindow* window )
1573 {
1574     return new wxCairoContext(this, window );
1575 }
1576
1577 // Path
1578
1579 wxGraphicsPath wxCairoRenderer::CreatePath()
1580 {
1581     wxGraphicsPath path;
1582     path.SetRefData( new wxCairoPathData(this) );
1583     return path;
1584 }
1585
1586
1587 // Matrix
1588
1589 wxGraphicsMatrix wxCairoRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
1590                                                 wxDouble tx, wxDouble ty)
1591
1592 {
1593     wxGraphicsMatrix m;
1594     wxCairoMatrixData* data = new wxCairoMatrixData( this );
1595     data->Set( a,b,c,d,tx,ty ) ;
1596     m.SetRefData(data);
1597     return m;
1598 }
1599
1600 wxGraphicsPen wxCairoRenderer::CreatePen(const wxPen& pen)
1601 {
1602     if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
1603         return wxNullGraphicsPen;
1604     else
1605     {
1606         wxGraphicsPen p;
1607         p.SetRefData(new wxCairoPenData( this, pen ));
1608         return p;
1609     }
1610 }
1611
1612 wxGraphicsBrush wxCairoRenderer::CreateBrush(const wxBrush& brush )
1613 {
1614     if ( !brush.Ok() || brush.GetStyle() == wxTRANSPARENT )
1615         return wxNullGraphicsBrush;
1616     else
1617     {
1618         wxGraphicsBrush p;
1619         p.SetRefData(new wxCairoBrushData( this, brush ));
1620         return p;
1621     }
1622 }
1623
1624 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1625 wxGraphicsBrush wxCairoRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1626                                                                       const wxColour&c1, const wxColour&c2)
1627 {
1628     wxGraphicsBrush p;
1629     wxCairoBrushData* d = new wxCairoBrushData( this );
1630     d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
1631     p.SetRefData(d);
1632     return p;
1633 }
1634
1635 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1636 // with radius r and color cColor
1637 wxGraphicsBrush wxCairoRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1638                                                                       const wxColour &oColor, const wxColour &cColor)
1639 {
1640     wxGraphicsBrush p;
1641     wxCairoBrushData* d = new wxCairoBrushData( this );
1642     d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
1643     p.SetRefData(d);
1644     return p;
1645 }
1646
1647 // sets the font
1648 wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour &col )
1649 {
1650     if ( font.Ok() )
1651     {
1652         wxGraphicsFont p;
1653         p.SetRefData(new wxCairoFontData( this , font, col ));
1654         return p;
1655     }
1656     else
1657         return wxNullGraphicsFont;
1658 }
1659
1660 #endif  // wxUSE_GRAPHICS_CONTEXT