src/generic/graphicc.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/generic/graphicc.cpp
   3 // Purpose:     cairo device context class
   4 // Author:      Stefan Csomor
   5 // Modified by:
   6 // Created:     2006-10-03
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2006 Stefan Csomor
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #include "wx/wxprec.h"
  13
  14 #include "wx/dc.h"
  15
  16 #ifdef __BORLANDC__
  17 #pragma hdrstop
  18 #endif
  19
  20 #ifndef WX_PRECOMP
  21 #include "wx/image.h"
  22 #include "wx/window.h"
  23 #include "wx/dc.h"
  24 #include "wx/utils.h"
  25 #include "wx/dialog.h"
  26 #include "wx/app.h"
  27 #include "wx/bitmap.h"
  28 #include "wx/dcmemory.h"
  29 #include "wx/log.h"
  30 #include "wx/icon.h"
  31 #include "wx/dcprint.h"
  32 #include "wx/module.h"
  33 #endif
  34
  35 #ifdef __WXGTK__
  36 #include <gtk/gtk.h>
  37 #endif
  38
  39 #include "wx/graphics.h"
  40 #include "wx/rawbmp.h"
  41
  42 #if wxUSE_GRAPHICS_CONTEXT
  43
  44 #include <vector>
  45
  46 using namespace std;
  47
  48 //-----------------------------------------------------------------------------
  49 // constants
  50 //-----------------------------------------------------------------------------
  51
  52 const double RAD2DEG = 180.0 / M_PI;
  53
  54 //-----------------------------------------------------------------------------
  55 // Local functions
  56 //-----------------------------------------------------------------------------
  57
  58 static inline double dmin(double a, double b)
  59 {
  60     return a < b ? a : b;
  61 }
  62 static inline double dmax(double a, double b)
  63 {
  64     return a > b ? a : b;
  65 }
  66
  67 static inline double DegToRad(double deg)
  68 {
  69     return (deg * M_PI) / 180.0;
  70 }
  71 static inline double RadToDeg(double deg)
  72 {
  73     return (deg * 180.0) / M_PI;
  74 }
  75
  76 //-----------------------------------------------------------------------------
  77 // device context implementation
  78 //
  79 // more and more of the dc functionality should be implemented by calling
  80 // the appropricate wxCairoContext, but we will have to do that step by step
  81 // also coordinate conversions should be moved to native matrix ops
  82 //-----------------------------------------------------------------------------
  83
  84 // we always stock two context states, one at entry, to be able to preserve the
  85 // state we were called with, the other one after changing to HI Graphics orientation
  86 // (this one is used for getting back clippings etc)
  87
  88 //-----------------------------------------------------------------------------
  89 // wxGraphicsPath implementation
  90 //-----------------------------------------------------------------------------
  91
  92 // TODO remove this dependency (gdiplus needs the macros)
  93
  94 #ifndef max
  95 #define max(a,b)            (((a) > (b)) ? (a) : (b))
  96 #endif
  97
  98 #ifndef min
  99 #define min(a,b)            (((a) < (b)) ? (a) : (b))
 100 #endif
 101
 102 #include <cairo.h>
 103 #ifdef __WXGTK__
 104 #include "wx/gtk/win_gtk.h"
 105 #include <gtk/gtk.h>
 106 #include "wx/fontutil.h"
 107 #endif
 108
 109 #ifdef __WXMSW__
 110 #include <cairo-win32.h>
 111 #endif
 112
 113 #ifdef __WXMAC__
 114 #include "wx/mac/private.h"
 115 #include <cairo-quartz.h>
 116 #include <cairo-atsui.h>
 117 #endif
 118
 119 class WXDLLIMPEXP_CORE wxCairoPathData : public wxGraphicsPathData
 120 {
 121 public :
 122     wxCairoPathData(wxGraphicsRenderer* renderer, cairo_t* path = NULL);
 123     ~wxCairoPathData();
 124
 125     virtual wxGraphicsObjectRefData *Clone() const;
 126
 127     //
 128     // These are the path primitives from which everything else can be constructed
 129     //
 130
 131     // begins a new subpath at (x,y)
 132     virtual void MoveToPoint( wxDouble x, wxDouble y );
 133
 134     // adds a straight line from the current point to (x,y)
 135     virtual void AddLineToPoint( wxDouble x, wxDouble y );
 136
 137     // adds a cubic Bezier curve from the current point, using two control points and an end point
 138     virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y );
 139
 140
 141     // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle
 142     virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ) ;
 143
 144     // gets the last point of the current path, (0,0) if not yet set
 145     virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const;
 146
 147     // adds another path
 148     virtual void AddPath( const wxGraphicsPathData* path );
 149
 150     // closes the current sub-path
 151     virtual void CloseSubpath();
 152
 153     //
 154     // These are convenience functions which - if not available natively will be assembled
 155     // using the primitives from above
 156     //
 157
 158     /*
 159
 160     // appends a rectangle as a new closed subpath
 161     virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) ;
 162     // appends an ellipsis as a new closed subpath fitting the passed rectangle
 163     virtual void AddEllipsis( wxDouble x, wxDouble y, wxDouble w , wxDouble h ) ;
 164
 165     // 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)
 166     virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r )  ;
 167     */
 168
 169     // returns the native path
 170     virtual void * GetNativePath() const ;
 171
 172     // give the native path returned by GetNativePath() back (there might be some deallocations necessary)
 173     virtual void UnGetNativePath(void *p) const;
 174
 175     // transforms each point of this path by the matrix
 176     virtual void Transform( const wxGraphicsMatrixData* matrix ) ;
 177
 178     // gets the bounding box enclosing all points (possibly including control points)
 179     virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const;
 180
 181     virtual bool Contains( wxDouble x, wxDouble y, int fillStyle = wxWINDING_RULE) const;
 182
 183 private :
 184     cairo_t* m_pathContext;
 185 };
 186
 187 class WXDLLIMPEXP_CORE wxCairoMatrixData : public wxGraphicsMatrixData
 188 {
 189 public :
 190     wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix = NULL ) ;
 191     virtual ~wxCairoMatrixData() ;
 192
 193     virtual wxGraphicsObjectRefData *Clone() const ;
 194
 195     // concatenates the matrix
 196     virtual void Concat( const wxGraphicsMatrixData *t );
 197
 198     // sets the matrix to the respective values
 199     virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
 200         wxDouble tx=0.0, wxDouble ty=0.0);
 201
 202     // gets the component valuess of the matrix
 203     virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL,  wxDouble* c=NULL,
 204                      wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const;
 205
 206     // makes this the inverse matrix
 207     virtual void Invert();
 208
 209     // returns true if the elements of the transformation matrix are equal ?
 210     virtual bool IsEqual( const wxGraphicsMatrixData* t) const ;
 211
 212     // return true if this is the identity matrix
 213     virtual bool IsIdentity() const;
 214
 215     //
 216     // transformation
 217     //
 218
 219     // add the translation to this matrix
 220     virtual void Translate( wxDouble dx , wxDouble dy );
 221
 222     // add the scale to this matrix
 223     virtual void Scale( wxDouble xScale , wxDouble yScale );
 224
 225     // add the rotation to this matrix (radians)
 226     virtual void Rotate( wxDouble angle );
 227
 228     //
 229     // apply the transforms
 230     //
 231
 232     // applies that matrix to the point
 233     virtual void TransformPoint( wxDouble *x, wxDouble *y ) const;
 234
 235     // applies the matrix except for translations
 236     virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const;
 237
 238     // returns the native representation
 239     virtual void * GetNativeMatrix() const;
 240 private:
 241     cairo_matrix_t m_matrix ;
 242 } ;
 243
 244 class WXDLLIMPEXP_CORE wxCairoPenData : public wxGraphicsObjectRefData
 245 {
 246 public:
 247     wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen );
 248     ~wxCairoPenData();
 249
 250     void Init();
 251
 252     virtual void Apply( wxGraphicsContext* context );
 253     virtual wxDouble GetWidth() { return m_width; }
 254
 255 private :
 256     double m_width;
 257
 258     double m_red;
 259     double m_green;
 260     double m_blue;
 261     double m_alpha;
 262
 263     cairo_line_cap_t m_cap;
 264     cairo_line_join_t m_join;
 265
 266     int m_count;
 267     const double *m_lengths;
 268     double *m_userLengths;
 269
 270     wxPen m_pen;
 271 };
 272
 273 class WXDLLIMPEXP_CORE wxCairoBrushData : public wxGraphicsObjectRefData
 274 {
 275 public:
 276     wxCairoBrushData( wxGraphicsRenderer* renderer );
 277     wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush );
 278     ~wxCairoBrushData ();
 279
 280     virtual void Apply( wxGraphicsContext* context );
 281     void CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 282         const wxColour&c1, const wxColour&c2 );
 283     void CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 284         const wxColour &oColor, const wxColour &cColor );
 285
 286 protected:
 287     virtual void Init();
 288
 289 private :
 290     double m_red;
 291     double m_green;
 292     double m_blue;
 293     double m_alpha;
 294
 295     cairo_pattern_t* m_brushPattern;
 296 };
 297
 298 class wxCairoFontData : public wxGraphicsObjectRefData
 299 {
 300 public:
 301     wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font, const wxColour& col );
 302     ~wxCairoFontData();
 303
 304     virtual void Apply( wxGraphicsContext* context );
 305 #ifdef __WXGTK__
 306     const PangoFontDescription* GetFont() const { return m_font; }
 307 #endif
 308 private :
 309     double m_size;
 310     double m_red;
 311     double m_green;
 312     double m_blue;
 313     double m_alpha;
 314 #ifdef __WXMAC__
 315     cairo_font_face_t *m_font;
 316 #elif defined(__WXGTK__)
 317     PangoFontDescription* m_font;
 318 #else
 319     wxCharBuffer m_fontName;
 320     cairo_font_slant_t m_slant;
 321     cairo_font_weight_t m_weight;
 322 #endif
 323 };
 324
 325 class WXDLLIMPEXP_CORE wxCairoContext : public wxGraphicsContext
 326 {
 327     DECLARE_NO_COPY_CLASS(wxCairoContext)
 328
 329 public:
 330     wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc );
 331 #ifdef __WXGTK__
 332     wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable );
 333 #endif
 334     wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context );
 335     wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window);
 336     wxCairoContext();
 337     virtual ~wxCairoContext();
 338
 339     virtual bool ShouldOffset() const
 340     {
 341         int penwidth = 0 ;
 342         if ( !m_pen.IsNull() )
 343         {
 344             penwidth = (int)((wxCairoPenData*)m_pen.GetRefData())->GetWidth();
 345             if ( penwidth == 0 )
 346                 penwidth = 1;
 347         }
 348         return ( penwidth % 2 ) == 1;
 349     }
 350
 351     virtual void Clip( const wxRegion &region );
 352
 353     // clips drawings to the rect
 354     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 355
 356     // resets the clipping to original extent
 357     virtual void ResetClip();
 358
 359     virtual void * GetNativeContext();
 360
 361     virtual void StrokePath( const wxGraphicsPath& p );
 362     virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxWINDING_RULE );
 363
 364     virtual void Translate( wxDouble dx , wxDouble dy );
 365     virtual void Scale( wxDouble xScale , wxDouble yScale );
 366     virtual void Rotate( wxDouble angle );
 367
 368     // concatenates this transform with the current transform of this context
 369     virtual void ConcatTransform( const wxGraphicsMatrix& matrix );
 370
 371     // sets the transform of this context
 372     virtual void SetTransform( const wxGraphicsMatrix& matrix );
 373
 374     // gets the matrix of this context
 375     virtual wxGraphicsMatrix GetTransform() const;
 376
 377     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 378     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 379     virtual void PushState();
 380     virtual void PopState();
 381
 382     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y);
 383     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
 384                                 wxDouble *descent, wxDouble *externalLeading ) const;
 385     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
 386
 387 private:
 388     void Init(cairo_t *context);
 389
 390     cairo_t* m_context;
 391 };
 392
 393 //-----------------------------------------------------------------------------
 394 // wxCairoPenData implementation
 395 //-----------------------------------------------------------------------------
 396
 397 wxCairoPenData::~wxCairoPenData()
 398 {
 399     delete[] m_userLengths;
 400 }
 401
 402 void wxCairoPenData::Init()
 403 {
 404     m_lengths = NULL;
 405     m_userLengths = NULL;
 406     m_width = 0;
 407     m_count = 0;
 408 }
 409
 410 wxCairoPenData::wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen )
 411 : wxGraphicsObjectRefData(renderer)
 412 {
 413     Init();
 414     m_pen = pen;
 415     m_width = m_pen.GetWidth();
 416     if (m_width <= 0.0)
 417         m_width = 0.1;
 418
 419     m_red = m_pen.GetColour().Red()/255.0;
 420     m_green = m_pen.GetColour().Green()/255.0;
 421     m_blue = m_pen.GetColour().Blue()/255.0;
 422     m_alpha = m_pen.GetColour().Alpha()/255.0;
 423
 424     switch ( m_pen.GetCap() )
 425     {
 426     case wxCAP_ROUND :
 427         m_cap = CAIRO_LINE_CAP_ROUND;
 428         break;
 429
 430     case wxCAP_PROJECTING :
 431         m_cap = CAIRO_LINE_CAP_SQUARE;
 432         break;
 433
 434     case wxCAP_BUTT :
 435         m_cap = CAIRO_LINE_CAP_BUTT;
 436         break;
 437
 438     default :
 439         m_cap = CAIRO_LINE_CAP_BUTT;
 440         break;
 441     }
 442
 443     switch ( m_pen.GetJoin() )
 444     {
 445     case wxJOIN_BEVEL :
 446         m_join = CAIRO_LINE_JOIN_BEVEL;
 447         break;
 448
 449     case wxJOIN_MITER :
 450         m_join = CAIRO_LINE_JOIN_MITER;
 451         break;
 452
 453     case wxJOIN_ROUND :
 454         m_join = CAIRO_LINE_JOIN_ROUND;
 455         break;
 456
 457     default :
 458         m_join = CAIRO_LINE_JOIN_MITER;
 459         break;
 460     }
 461
 462     const double dashUnit = m_width < 1.0 ? 1.0 : m_width;
 463     const double dotted[] =
 464     {
 465         dashUnit , dashUnit + 2.0
 466     };
 467     static const double short_dashed[] =
 468     {
 469         9.0 , 6.0
 470     };
 471     static const double dashed[] =
 472     {
 473         19.0 , 9.0
 474     };
 475     static const double dotted_dashed[] =
 476     {
 477         9.0 , 6.0 , 3.0 , 3.0
 478     };
 479
 480     switch ( m_pen.GetStyle() )
 481     {
 482     case wxSOLID :
 483         break;
 484
 485     case wxDOT :
 486         m_count = WXSIZEOF(dotted);
 487         m_userLengths = new double[ m_count ] ;
 488         memcpy( m_userLengths, dotted, sizeof(dotted) );
 489         m_lengths = m_userLengths;
 490         break;
 491
 492     case wxLONG_DASH :
 493         m_lengths = dashed ;
 494         m_count = WXSIZEOF(dashed);
 495         break;
 496
 497     case wxSHORT_DASH :
 498         m_lengths = short_dashed ;
 499         m_count = WXSIZEOF(short_dashed);
 500         break;
 501
 502     case wxDOT_DASH :
 503         m_lengths = dotted_dashed ;
 504         m_count = WXSIZEOF(dotted_dashed);
 505         break;
 506
 507     case wxUSER_DASH :
 508         {
 509             wxDash *wxdashes ;
 510             m_count = m_pen.GetDashes( &wxdashes ) ;
 511             if ((wxdashes != NULL) && (m_count > 0))
 512             {
 513                 m_userLengths = new double[m_count] ;
 514                 for ( int i = 0 ; i < m_count ; ++i )
 515                 {
 516                     m_userLengths[i] = wxdashes[i] * dashUnit ;
 517
 518                     if ( i % 2 == 1 && m_userLengths[i] < dashUnit + 2.0 )
 519                         m_userLengths[i] = dashUnit + 2.0 ;
 520                     else if ( i % 2 == 0 && m_userLengths[i] < dashUnit )
 521                         m_userLengths[i] = dashUnit ;
 522                 }
 523             }
 524             m_lengths = m_userLengths ;
 525         }
 526         break;
 527     case wxSTIPPLE :
 528         {
 529             /*
 530             wxBitmap* bmp = pen.GetStipple();
 531             if ( bmp && bmp->Ok() )
 532             {
 533             wxDELETE( m_penImage );
 534             wxDELETE( m_penBrush );
 535             m_penImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 536             m_penBrush = new TextureBrush(m_penImage);
 537             m_pen->SetBrush( m_penBrush );
 538             }
 539             */
 540         }
 541         break;
 542     default :
 543         if ( m_pen.GetStyle() >= wxFIRST_HATCH && m_pen.GetStyle() <= wxLAST_HATCH )
 544         {
 545             /*
 546             wxDELETE( m_penBrush );
 547             HatchStyle style = HatchStyleHorizontal;
 548             switch( pen.GetStyle() )
 549             {
 550             case wxBDIAGONAL_HATCH :
 551             style = HatchStyleBackwardDiagonal;
 552             break ;
 553             case wxCROSSDIAG_HATCH :
 554             style = HatchStyleDiagonalCross;
 555             break ;
 556             case wxFDIAGONAL_HATCH :
 557             style = HatchStyleForwardDiagonal;
 558             break ;
 559             case wxCROSS_HATCH :
 560             style = HatchStyleCross;
 561             break ;
 562             case wxHORIZONTAL_HATCH :
 563             style = HatchStyleHorizontal;
 564             break ;
 565             case wxVERTICAL_HATCH :
 566             style = HatchStyleVertical;
 567             break ;
 568
 569             }
 570             m_penBrush = new HatchBrush(style,Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
 571             pen.GetColour().Green() , pen.GetColour().Blue() ), Color.Transparent );
 572             m_pen->SetBrush( m_penBrush )
 573             */
 574         }
 575         break;
 576     }
 577 }
 578
 579 void wxCairoPenData::Apply( wxGraphicsContext* context )
 580 {
 581     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 582     cairo_set_line_width(ctext,m_width);
 583     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 584     cairo_set_line_cap(ctext,m_cap);
 585     cairo_set_line_join(ctext,m_join);
 586     cairo_set_dash(ctext,(double*)m_lengths,m_count,0.0);
 587 }
 588
 589 //-----------------------------------------------------------------------------
 590 // wxCairoBrushData implementation
 591 //-----------------------------------------------------------------------------
 592
 593 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer )
 594   : wxGraphicsObjectRefData( renderer )
 595 {
 596     Init();
 597 }
 598
 599 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush )
 600   : wxGraphicsObjectRefData(renderer)
 601 {
 602     Init();
 603
 604     m_red = brush.GetColour().Red()/255.0;
 605     m_green = brush.GetColour().Green()/255.0;
 606     m_blue = brush.GetColour().Blue()/255.0;
 607     m_alpha = brush.GetColour().Alpha()/255.0;
 608     /*
 609     if ( brush.GetStyle() == wxSOLID)
 610     {
 611     m_brush = new SolidBrush( Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 612     brush.GetColour().Green() , brush.GetColour().Blue() ) );
 613     }
 614     else if ( brush.IsHatch() )
 615     {
 616     HatchStyle style = HatchStyleHorizontal;
 617     switch( brush.GetStyle() )
 618     {
 619     case wxBDIAGONAL_HATCH :
 620     style = HatchStyleBackwardDiagonal;
 621     break ;
 622     case wxCROSSDIAG_HATCH :
 623     style = HatchStyleDiagonalCross;
 624     break ;
 625     case wxFDIAGONAL_HATCH :
 626     style = HatchStyleForwardDiagonal;
 627     break ;
 628     case wxCROSS_HATCH :
 629     style = HatchStyleCross;
 630     break ;
 631     case wxHORIZONTAL_HATCH :
 632     style = HatchStyleHorizontal;
 633     break ;
 634     case wxVERTICAL_HATCH :
 635     style = HatchStyleVertical;
 636     break ;
 637
 638     }
 639     m_brush = new HatchBrush(style,Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 640     brush.GetColour().Green() , brush.GetColour().Blue() ), Color.Transparent );
 641     }
 642     else
 643     {
 644     wxBitmap* bmp = brush.GetStipple();
 645     if ( bmp && bmp->Ok() )
 646     {
 647     wxDELETE( m_brushImage );
 648     m_brushImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 649     m_brush = new TextureBrush(m_brushImage);
 650     }
 651     }
 652     */
 653 }
 654
 655 wxCairoBrushData::~wxCairoBrushData ()
 656 {
 657     if (m_brushPattern)
 658         cairo_pattern_destroy(m_brushPattern);
 659 }
 660
 661 void wxCairoBrushData::Apply( wxGraphicsContext* context )
 662 {
 663     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 664     if ( m_brushPattern )
 665     {
 666         cairo_set_source(ctext,m_brushPattern);
 667     }
 668     else
 669     {
 670         cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 671     }
 672 }
 673
 674 void wxCairoBrushData::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 675         const wxColour&c1, const wxColour&c2 )
 676 {
 677     m_brushPattern = cairo_pattern_create_linear(x1,y1,x2,y2);
 678     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,c1.Red()/255.0,
 679         c1.Green()/255.0, c1.Blue()/255.0,c1.Alpha()/255.0);
 680     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,c2.Red()/255.0,
 681         c2.Green()/255.0, c2.Blue()/255.0,c2.Alpha()/255.0);
 682     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 683 }
 684
 685 void wxCairoBrushData::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 686         const wxColour &oColor, const wxColour &cColor )
 687 {
 688     m_brushPattern = cairo_pattern_create_radial(xo,yo,0.0,xc,yc,radius);
 689     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,oColor.Red()/255.0,
 690         oColor.Green()/255.0, oColor.Blue()/255.0,oColor.Alpha()/255.0);
 691     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,cColor.Red()/255.0,
 692         cColor.Green()/255.0, cColor.Blue()/255.0,cColor.Alpha()/255.0);
 693     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 694 }
 695
 696 void wxCairoBrushData::Init()
 697 {
 698     m_brushPattern = NULL;
 699 }
 700
 701 //-----------------------------------------------------------------------------
 702 // wxCairoFontData implementation
 703 //-----------------------------------------------------------------------------
 704
 705 wxCairoFontData::wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font,
 706                          const wxColour& col ) : wxGraphicsObjectRefData(renderer)
 707 {
 708     m_red = col.Red()/255.0;
 709     m_green = col.Green()/255.0;
 710     m_blue = col.Blue()/255.0;
 711     m_alpha = col.Alpha()/255.0;
 712     m_size = font.GetPointSize();
 713
 714 #ifdef __WXMAC__
 715     m_font = cairo_atsui_font_face_create_for_atsu_font_id( font.MacGetATSUFontID() );
 716 #elif defined(__WXGTK__)
 717     m_font = pango_font_description_copy( font.GetNativeFontInfo()->description );
 718 #else
 719     m_fontName = font.GetFaceName().mb_str(wxConvUTF8);
 720     m_slant = font.GetStyle() == wxFONTSTYLE_ITALIC ? CAIRO_FONT_SLANT_ITALIC:CAIRO_FONT_SLANT_NORMAL;
 721     m_weight = font.GetWeight() == wxFONTWEIGHT_BOLD ? CAIRO_FONT_WEIGHT_BOLD:CAIRO_FONT_WEIGHT_NORMAL;
 722 #endif
 723 }
 724
 725 wxCairoFontData::~wxCairoFontData()
 726 {
 727 #ifdef __WXMAC__
 728     cairo_font_face_destroy( m_font );
 729 #elif defined(__WXGTK__)
 730     pango_font_description_free( m_font );
 731 #else
 732 #endif
 733 }
 734
 735 void wxCairoFontData::Apply( wxGraphicsContext* context )
 736 {
 737     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 738     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 739 #ifdef __WXGTK__
 740     // the rest is done using Pango layouts
 741 #elif defined(__WXMAC__)
 742     cairo_set_font_face(ctext, m_font);
 743 #else
 744     cairo_select_font_face(ctext, m_fontName, m_slant, m_weights );
 745     cairo_set_font_size(ctext, m_size );
 746 #endif
 747 }
 748
 749 //-----------------------------------------------------------------------------
 750 // wxCairoPathData implementation
 751 //-----------------------------------------------------------------------------
 752
 753 wxCairoPathData::wxCairoPathData( wxGraphicsRenderer* renderer, cairo_t* pathcontext)
 754     : wxGraphicsPathData(renderer)
 755 {
 756     if (pathcontext)
 757     {
 758         m_pathContext = pathcontext;
 759     }
 760     else
 761     {
 762         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 763         m_pathContext = cairo_create(surface);
 764         cairo_surface_destroy (surface);
 765     }
 766 }
 767
 768 wxCairoPathData::~wxCairoPathData()
 769 {
 770     cairo_destroy(m_pathContext);
 771 }
 772
 773 wxGraphicsObjectRefData *wxCairoPathData::Clone() const
 774 {
 775     cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 776     cairo_t* pathcontext = cairo_create(surface);
 777     cairo_surface_destroy (surface);
 778
 779     cairo_path_t* path = cairo_copy_path(m_pathContext);
 780     cairo_append_path(pathcontext, path);
 781     cairo_path_destroy(path);
 782     return new wxCairoPathData( GetRenderer() ,pathcontext);
 783 }
 784
 785
 786 void* wxCairoPathData::GetNativePath() const
 787 {
 788     return cairo_copy_path(m_pathContext) ;
 789 }
 790
 791 void wxCairoPathData::UnGetNativePath(void *p) const
 792 {
 793     cairo_path_destroy((cairo_path_t*)p);
 794 }
 795
 796 //
 797 // The Primitives
 798 //
 799
 800 void wxCairoPathData::MoveToPoint( wxDouble x , wxDouble y )
 801 {
 802     cairo_move_to(m_pathContext,x,y);
 803 }
 804
 805 void wxCairoPathData::AddLineToPoint( wxDouble x , wxDouble y )
 806 {
 807     cairo_line_to(m_pathContext,x,y);
 808 }
 809
 810 void wxCairoPathData::AddPath( const wxGraphicsPathData* path )
 811 {
 812     cairo_path_t* p = (cairo_path_t*)path->GetNativePath();
 813     cairo_append_path(m_pathContext, p);
 814     UnGetNativePath(p);
 815 }
 816
 817 void wxCairoPathData::CloseSubpath()
 818 {
 819     cairo_close_path(m_pathContext);
 820 }
 821
 822 void wxCairoPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 823 {
 824     cairo_curve_to(m_pathContext,cx1,cy1,cx2,cy2,x,y);
 825 }
 826
 827 // gets the last point of the current path, (0,0) if not yet set
 828 void wxCairoPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 829 {
 830     double dx,dy;
 831     cairo_get_current_point(m_pathContext,&dx,&dy);
 832     if (x)
 833         *x = dx;
 834     if (y)
 835         *y = dy;
 836 }
 837
 838 void wxCairoPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, double startAngle, double endAngle, bool clockwise )
 839 {
 840     // as clockwise means positive in our system (y pointing downwards)
 841     // TODO make this interpretation dependent of the
 842     // real device trans
 843     if ( clockwise||(endAngle-startAngle)>=2*M_PI)
 844         cairo_arc(m_pathContext,x,y,r,startAngle,endAngle);
 845     else
 846         cairo_arc_negative(m_pathContext,x,y,r,startAngle,endAngle);
 847 }
 848
 849 // transforms each point of this path by the matrix
 850 void wxCairoPathData::Transform( const wxGraphicsMatrixData* matrix )
 851 {
 852     // as we don't have a true path object, we have to apply the inverse
 853     // matrix to the context
 854     cairo_matrix_t m = *((cairo_matrix_t*) matrix->GetNativeMatrix());
 855     cairo_matrix_invert( &m );
 856     cairo_transform(m_pathContext,&m);
 857 }
 858
 859 // gets the bounding box enclosing all points (possibly including control points)
 860 void wxCairoPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 861 {
 862     double x1,y1,x2,y2;
 863
 864     cairo_stroke_extents( m_pathContext, &x1, &y1, &x2, &y2 );
 865     if ( x2 < x1 )
 866     {
 867         *x = x2;
 868         *w = x1-x2;
 869     }
 870     else
 871     {
 872         *x = x1;
 873         *w = x2-x1;
 874     }
 875
 876     if( y2 < y1 )
 877     {
 878         *y = y2;
 879         *h = y1-y2;
 880     }
 881     else
 882     {
 883         *y = y1;
 884         *h = y2-y1;
 885     }
 886 }
 887
 888 bool wxCairoPathData::Contains( wxDouble x, wxDouble y, int WXUNUSED(fillStyle) ) const
 889 {
 890     return cairo_in_stroke( m_pathContext, x, y) != 0;
 891 }
 892
 893 //-----------------------------------------------------------------------------
 894 // wxCairoMatrixData implementation
 895 //-----------------------------------------------------------------------------
 896
 897 wxCairoMatrixData::wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix )
 898     : wxGraphicsMatrixData(renderer)
 899 {
 900     if ( matrix )
 901         m_matrix = *matrix;
 902 }
 903
 904 wxCairoMatrixData::~wxCairoMatrixData()
 905 {
 906     // nothing to do
 907 }
 908
 909 wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 910 {
 911     return new wxCairoMatrixData(GetRenderer(),&m_matrix);
 912 }
 913
 914 // concatenates the matrix
 915 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 916 {
 917     cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
 918 }
 919
 920 // sets the matrix to the respective values
 921 void wxCairoMatrixData::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 922                         wxDouble tx, wxDouble ty)
 923 {
 924     cairo_matrix_init( &m_matrix, a, b, c, d, tx, ty);
 925 }
 926
 927 // gets the component valuess of the matrix
 928 void wxCairoMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
 929                             wxDouble* d, wxDouble* tx, wxDouble* ty) const
 930 {
 931     if (a)  *a = m_matrix.xx;
 932     if (b)  *b = m_matrix.yx;
 933     if (c)  *c = m_matrix.xy;
 934     if (d)  *d = m_matrix.yy;
 935     if (tx) *tx= m_matrix.x0;
 936     if (ty) *ty= m_matrix.y0;
 937 }
 938
 939 // makes this the inverse matrix
 940 void wxCairoMatrixData::Invert()
 941 {
 942     cairo_matrix_invert( &m_matrix );
 943 }
 944
 945 // returns true if the elements of the transformation matrix are equal ?
 946 bool wxCairoMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
 947 {
 948     const cairo_matrix_t* tm = (cairo_matrix_t*) t->GetNativeMatrix();
 949     return (
 950         m_matrix.xx == tm->xx &&
 951         m_matrix.yx == tm->yx &&
 952         m_matrix.xy == tm->xy &&
 953         m_matrix.yy == tm->yy &&
 954         m_matrix.x0 == tm->x0 &&
 955         m_matrix.y0 == tm->y0 ) ;
 956 }
 957
 958 // return true if this is the identity matrix
 959 bool wxCairoMatrixData::IsIdentity() const
 960 {
 961     return ( m_matrix.xx == 1 && m_matrix.yy == 1 &&
 962         m_matrix.yx == 0 && m_matrix.xy == 0 && m_matrix.x0 == 0 && m_matrix.y0 == 0);
 963 }
 964
 965 //
 966 // transformation
 967 //
 968
 969 // add the translation to this matrix
 970 void wxCairoMatrixData::Translate( wxDouble dx , wxDouble dy )
 971 {
 972     cairo_matrix_translate( &m_matrix, dx, dy) ;
 973 }
 974
 975 // add the scale to this matrix
 976 void wxCairoMatrixData::Scale( wxDouble xScale , wxDouble yScale )
 977 {
 978     cairo_matrix_scale( &m_matrix, xScale, yScale) ;
 979 }
 980
 981 // add the rotation to this matrix (radians)
 982 void wxCairoMatrixData::Rotate( wxDouble angle )
 983 {
 984     cairo_matrix_rotate( &m_matrix, angle) ;
 985 }
 986
 987 //
 988 // apply the transforms
 989 //
 990
 991 // applies that matrix to the point
 992 void wxCairoMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
 993 {
 994     double lx = *x, ly = *y ;
 995     cairo_matrix_transform_point( &m_matrix, &lx, &ly);
 996     *x = lx;
 997     *y = ly;
 998 }
 999
1000 // applies the matrix except for translations
1001 void wxCairoMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
1002 {
1003     double lx = *dx, ly = *dy ;
1004     cairo_matrix_transform_distance( &m_matrix, &lx, &ly);
1005     *dx = lx;
1006     *dy = ly;
1007 }
1008
1009 // returns the native representation
1010 void * wxCairoMatrixData::GetNativeMatrix() const
1011 {
1012     return (void*) &m_matrix;
1013 }
1014
1015 //-----------------------------------------------------------------------------
1016 // wxCairoContext implementation
1017 //-----------------------------------------------------------------------------
1018
1019 class wxCairoOffsetHelper
1020 {
1021 public :
1022     wxCairoOffsetHelper( cairo_t* ctx , bool offset )
1023     {
1024         m_ctx = ctx;
1025         m_offset = offset;
1026         if ( m_offset )
1027              cairo_translate( m_ctx, 0.5, 0.5 );
1028     }
1029     ~wxCairoOffsetHelper( )
1030     {
1031         if ( m_offset )
1032             cairo_translate( m_ctx, -0.5, -0.5 );
1033     }
1034 public :
1035     cairo_t* m_ctx;
1036     bool m_offset;
1037 } ;
1038
1039 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
1040 : wxGraphicsContext(renderer)
1041 {
1042 #ifdef __WXGTK__
1043     Init( gdk_cairo_create( dc.m_window ) );
1044 #endif
1045 #ifdef __WXMAC__
1046     int width, height;
1047     dc.GetSize( &width, &height );
1048     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1049     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1050     Init( cairo_create( surface ) );
1051     cairo_surface_destroy( surface );
1052 #endif
1053 }
1054
1055 #ifdef __WXGTK__
1056 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable )
1057 : wxGraphicsContext(renderer)
1058 {
1059     Init( gdk_cairo_create( drawable ) );
1060 }
1061 #endif
1062
1063 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
1064 : wxGraphicsContext(renderer)
1065 {
1066     Init( context );
1067 }
1068
1069 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
1070 : wxGraphicsContext(renderer)
1071 {
1072 #ifdef __WXGTK__
1073     // something along these lines (copied from dcclient)
1074
1075     GtkWidget *widget = window->m_wxwindow;
1076
1077     // Some controls don't have m_wxwindow - like wxStaticBox, but the user
1078     // code should still be able to create wxClientDCs for them, so we will
1079     // use the parent window here then.
1080     if ( !widget )
1081     {
1082         window = window->GetParent();
1083         widget = window->m_wxwindow;
1084     }
1085
1086     wxASSERT_MSG( widget, wxT("wxCairoContext needs a widget") );
1087
1088     wxPizza *pizza = WX_PIZZA( widget );
1089     GdkDrawable* drawable = pizza->m_backing_window;
1090     Init( gdk_cairo_create( drawable ) ) ;
1091 #endif
1092 }
1093
1094 wxCairoContext::~wxCairoContext()
1095 {
1096     if ( m_context )
1097     {
1098         PopState();
1099         PopState();
1100         cairo_destroy(m_context);
1101     }
1102 }
1103
1104 void wxCairoContext::Init(cairo_t *context)
1105 {
1106     m_context = context ;
1107     PushState();
1108     PushState();
1109 }
1110
1111
1112 void wxCairoContext::Clip( const wxRegion& region )
1113 {
1114     // Create a path with all the rectangles in the region
1115     wxGraphicsPath path = GetRenderer()->CreatePath();
1116     wxRegionIterator ri(region);
1117     while (ri)
1118     {
1119         path.AddRectangle(ri.GetX(), ri.GetY(), ri.GetW(), ri.GetH());
1120         ri++;
1121     }
1122
1123     // Put it in the context
1124     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1125     cairo_append_path(m_context, cp);
1126
1127     // clip to that path
1128     cairo_clip(m_context);
1129     path.UnGetNativePath(cp);
1130 }
1131
1132 void wxCairoContext::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1133 {
1134     // Create a path with this rectangle
1135     wxGraphicsPath path = GetRenderer()->CreatePath();
1136     path.AddRectangle(x,y,w,h);
1137
1138     // Put it in the context
1139     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1140     cairo_append_path(m_context, cp);
1141
1142     // clip to that path
1143     cairo_clip(m_context);
1144     path.UnGetNativePath(cp);
1145 }
1146
1147 void wxCairoContext::ResetClip()
1148 {
1149     cairo_reset_clip(m_context);
1150 }
1151
1152
1153 void wxCairoContext::StrokePath( const wxGraphicsPath& path )
1154 {
1155     if ( !m_pen.IsNull() )
1156     {
1157         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1158         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1159         cairo_append_path(m_context,cp);
1160         ((wxCairoPenData*)m_pen.GetRefData())->Apply(this);
1161         cairo_stroke(m_context);
1162         path.UnGetNativePath(cp);
1163     }
1164 }
1165
1166 void wxCairoContext::FillPath( const wxGraphicsPath& path , int fillStyle )
1167 {
1168     if ( !m_brush.IsNull() )
1169     {
1170         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1171         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1172         cairo_append_path(m_context,cp);
1173         ((wxCairoBrushData*)m_brush.GetRefData())->Apply(this);
1174         cairo_set_fill_rule(m_context,fillStyle==wxODDEVEN_RULE ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
1175         cairo_fill(m_context);
1176         path.UnGetNativePath(cp);
1177     }
1178 }
1179
1180 void wxCairoContext::Rotate( wxDouble angle )
1181 {
1182     cairo_rotate(m_context,angle);
1183 }
1184
1185 void wxCairoContext::Translate( wxDouble dx , wxDouble dy )
1186 {
1187     cairo_translate(m_context,dx,dy);
1188 }
1189
1190 void wxCairoContext::Scale( wxDouble xScale , wxDouble yScale )
1191 {
1192     cairo_scale(m_context,xScale,yScale);
1193 }
1194
1195 // concatenates this transform with the current transform of this context
1196 void wxCairoContext::ConcatTransform( const wxGraphicsMatrix& matrix )
1197 {
1198     cairo_transform(m_context,(const cairo_matrix_t *) matrix.GetNativeMatrix());
1199 }
1200
1201 // sets the transform of this context
1202 void wxCairoContext::SetTransform( const wxGraphicsMatrix& matrix )
1203 {
1204     cairo_set_matrix(m_context,(const cairo_matrix_t*) matrix.GetNativeMatrix());
1205 }
1206
1207 // gets the matrix of this context
1208 wxGraphicsMatrix wxCairoContext::GetTransform() const
1209 {
1210     wxGraphicsMatrix matrix = CreateMatrix();
1211     cairo_get_matrix(m_context,(cairo_matrix_t*) matrix.GetNativeMatrix());
1212     return matrix;
1213 }
1214
1215
1216
1217 void wxCairoContext::PushState()
1218 {
1219     cairo_save(m_context);
1220 }
1221
1222 void wxCairoContext::PopState()
1223 {
1224     cairo_restore(m_context);
1225 }
1226
1227 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1228 {
1229     wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
1230
1231     cairo_surface_t* surface;
1232     int bw = bmp.GetWidth();
1233     int bh = bmp.GetHeight();
1234     wxBitmap bmpSource = bmp;  // we need a non-const instance
1235     unsigned char* buffer = new unsigned char[bw*bh*4];
1236     wxUint32* data = (wxUint32*)buffer;
1237
1238     // Create a surface object and copy the bitmap pixel data to it.  if the
1239     // image has alpha (or a mask represented as alpha) then we'll use a
1240     // different format and iterator than if it doesn't...
1241     if (bmpSource.HasAlpha() || bmpSource.GetMask())
1242     {
1243         surface = cairo_image_surface_create_for_data(
1244             buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
1245         wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1246         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1247
1248         wxAlphaPixelData::Iterator p(pixData);
1249         for (int y=0; y<bh; y++)
1250         {
1251             wxAlphaPixelData::Iterator rowStart = p;
1252             for (int x=0; x<bw; x++)
1253             {
1254                 // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
1255                 // with alpha in the upper 8 bits, then red, then green, then
1256                 // blue. The 32-bit quantities are stored native-endian.
1257                 // Pre-multiplied alpha is used.
1258                 unsigned char alpha = p.Alpha();
1259                 if (alpha == 0)
1260                     *data = 0;
1261                 else
1262                     *data = ( alpha                      << 24
1263                               | (p.Red() * alpha/255)    << 16
1264                               | (p.Green() * alpha/255)  <<  8
1265                               | (p.Blue() * alpha/255) );
1266                 ++data;
1267                 ++p;
1268             }
1269             p = rowStart;
1270             p.OffsetY(pixData, 1);
1271         }
1272     }
1273     else  // no alpha
1274     {
1275         surface = cairo_image_surface_create_for_data(
1276             buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
1277         wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1278         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1279
1280         wxNativePixelData::Iterator p(pixData);
1281         for (int y=0; y<bh; y++)
1282         {
1283             wxNativePixelData::Iterator rowStart = p;
1284             for (int x=0; x<bw; x++)
1285             {
1286                 // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
1287                 // the upper 8 bits unused. Red, Green, and Blue are stored in
1288                 // the remaining 24 bits in that order.  The 32-bit quantities
1289                 // are stored native-endian.
1290                 *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
1291                 ++data;
1292                 ++p;
1293             }
1294             p = rowStart;
1295             p.OffsetY(pixData, 1);
1296         }
1297     }
1298
1299
1300     PushState();
1301
1302     // In case we're scaling the image by using a width and height different
1303     // than the bitmap's size create a pattern transformation on the surface and
1304     // draw the transformed pattern.
1305     cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
1306     wxDouble scaleX = w / bw;
1307     wxDouble scaleY = h / bh;
1308     cairo_scale(m_context, scaleX, scaleY);
1309
1310     // prepare to draw the image
1311     cairo_translate(m_context, x, y);
1312     cairo_set_source(m_context, pattern);
1313     // use the original size here since the context is scaled already...
1314     cairo_rectangle(m_context, 0, 0, bw, bh);
1315     // fill the rectangle using the pattern
1316     cairo_fill(m_context);
1317
1318     // clean up
1319     cairo_pattern_destroy(pattern);
1320     cairo_surface_destroy(surface);
1321     delete [] buffer;
1322     PopState();
1323 }
1324
1325 void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1326 {
1327     // An icon is a bitmap on wxGTK, so do this the easy way.  When we want to
1328     // start using the Cairo backend on other platforms then we may need to
1329     // fiddle with this...
1330     DrawBitmap(icon, x, y, w, h);
1331 }
1332
1333
1334 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
1335 {
1336     if ( m_font.IsNull() || str.empty())
1337         return;
1338
1339 #ifdef __WXGTK__
1340     const wxCharBuffer data = wxConvUTF8.cWC2MB( str );
1341     if ( !data )
1342         return;
1343     size_t datalen = strlen(data);
1344     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1345
1346     PangoLayout *layout = pango_cairo_create_layout (m_context);
1347     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1348     pango_layout_set_text(layout, data, datalen);
1349     cairo_move_to(m_context, x, y);
1350     pango_cairo_show_layout (m_context, layout);
1351
1352     g_object_unref (layout);
1353 #else
1354     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1355     // Cairo's x,y for drawing text is at the baseline, so we need to adjust
1356     // the position we move to by the ascent.
1357     cairo_font_extents_t fe;
1358     cairo_font_extents(m_context, &fe);
1359     cairo_move_to(m_context, x, y+fe.ascent);
1360
1361     const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1362     cairo_show_text(m_context,buf);
1363 #endif
1364 }
1365
1366 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
1367                                     wxDouble *descent, wxDouble *externalLeading ) const
1368 {
1369     if ( width )
1370         *width = 0;
1371     if ( height )
1372         *height = 0;
1373     if ( descent )
1374         *descent = 0;
1375     if ( externalLeading )
1376         *externalLeading = 0;
1377
1378     if ( m_font.IsNull() || str.empty())
1379         return;
1380
1381 #ifdef __WXGTK__
1382     int w, h;
1383
1384     PangoLayout *layout = pango_cairo_create_layout (m_context);
1385     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1386     const wxCharBuffer data = wxConvUTF8.cWC2MB( str );
1387     if ( !data )
1388     {
1389         return;
1390     }
1391     pango_layout_set_text( layout, data, strlen(data) );
1392     pango_layout_get_pixel_size (layout, &w, &h);
1393     if ( width )
1394         *width = w;
1395     if ( height )
1396         *height = h;
1397     if (descent)
1398     {
1399         PangoLayoutIter *iter = pango_layout_get_iter(layout);
1400         int baseline = pango_layout_iter_get_baseline(iter);
1401         pango_layout_iter_free(iter);
1402         *descent = h - PANGO_PIXELS(baseline);
1403     }
1404     g_object_unref (layout);
1405 #else
1406     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
1407
1408     if (width)
1409     {
1410         const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1411         cairo_text_extents_t te;
1412         cairo_text_extents(m_context, buf, &te);
1413         *width = te.width;
1414     }
1415
1416     if (height || descent || externalLeading)
1417     {
1418         cairo_font_extents_t fe;
1419         cairo_font_extents(m_context, &fe);
1420
1421         if (height)
1422             *height = fe.height;
1423         if ( descent )
1424             *descent = fe.descent;
1425         if ( externalLeading )
1426             *externalLeading = wxMax(0, fe.height - (fe.ascent + fe.descent));
1427     }
1428 #endif
1429 }
1430
1431 void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
1432 {
1433     widths.Empty();
1434     widths.Add(0, text.length());
1435
1436     if (text.empty())
1437         return;
1438
1439     // TODO
1440 }
1441
1442 void * wxCairoContext::GetNativeContext()
1443 {
1444     return m_context;
1445 }
1446
1447 //-----------------------------------------------------------------------------
1448 // wxCairoRenderer declaration
1449 //-----------------------------------------------------------------------------
1450
1451 class WXDLLIMPEXP_CORE wxCairoRenderer : public wxGraphicsRenderer
1452 {
1453 public :
1454     wxCairoRenderer() {}
1455
1456     virtual ~wxCairoRenderer() {}
1457
1458     // Context
1459
1460     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);
1461
1462 #ifdef __WXMSW__
1463     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
1464 #endif
1465
1466     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
1467
1468     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
1469
1470     virtual wxGraphicsContext * CreateContext( wxWindow* window );
1471
1472     virtual wxGraphicsContext * CreateMeasuringContext();
1473
1474     // Path
1475
1476     virtual wxGraphicsPath CreatePath();
1477
1478     // Matrix
1479
1480     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
1481         wxDouble tx=0.0, wxDouble ty=0.0);
1482
1483
1484     virtual wxGraphicsPen CreatePen(const wxPen& pen) ;
1485
1486     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
1487
1488     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1489     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1490         const wxColour&c1, const wxColour&c2) ;
1491
1492     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1493     // with radius r and color cColor
1494     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1495         const wxColour &oColor, const wxColour &cColor) ;
1496
1497     // sets the font
1498     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
1499
1500 private :
1501     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
1502 } ;
1503
1504 //-----------------------------------------------------------------------------
1505 // wxCairoRenderer implementation
1506 //-----------------------------------------------------------------------------
1507
1508 IMPLEMENT_DYNAMIC_CLASS(wxCairoRenderer,wxGraphicsRenderer)
1509
1510 static wxCairoRenderer gs_cairoGraphicsRenderer;
1511
1512 #ifdef __WXGTK__
1513 wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
1514 {
1515     return &gs_cairoGraphicsRenderer;
1516 }
1517 #endif
1518
1519 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
1520 {
1521     return new wxCairoContext(this,dc);
1522 }
1523
1524 #ifdef __WXMSW__
1525 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxMemoryDC& dc)
1526 {
1527     return NULL;
1528 }
1529 #endif
1530
1531 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeContext( void * context )
1532 {
1533     return new wxCairoContext(this,(cairo_t*)context);
1534 }
1535
1536
1537 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeWindow( void * window )
1538 {
1539 #ifdef __WXGTK__
1540     return new wxCairoContext(this,(GdkDrawable*)window);
1541 #else
1542     return NULL;
1543 #endif
1544 }
1545
1546 wxGraphicsContext * wxCairoRenderer::CreateMeasuringContext()
1547 {
1548     return NULL;
1549     // TODO
1550 }
1551
1552 wxGraphicsContext * wxCairoRenderer::CreateContext( wxWindow* window )
1553 {
1554     return new wxCairoContext(this, window );
1555 }
1556
1557 // Path
1558
1559 wxGraphicsPath wxCairoRenderer::CreatePath()
1560 {
1561     wxGraphicsPath path;
1562     path.SetRefData( new wxCairoPathData(this) );
1563     return path;
1564 }
1565
1566
1567 // Matrix
1568
1569 wxGraphicsMatrix wxCairoRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
1570                                                 wxDouble tx, wxDouble ty)
1571
1572 {
1573     wxGraphicsMatrix m;
1574     wxCairoMatrixData* data = new wxCairoMatrixData( this );
1575     data->Set( a,b,c,d,tx,ty ) ;
1576     m.SetRefData(data);
1577     return m;
1578 }
1579
1580 wxGraphicsPen wxCairoRenderer::CreatePen(const wxPen& pen)
1581 {
1582     if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
1583         return wxNullGraphicsPen;
1584     else
1585     {
1586         wxGraphicsPen p;
1587         p.SetRefData(new wxCairoPenData( this, pen ));
1588         return p;
1589     }
1590 }
1591
1592 wxGraphicsBrush wxCairoRenderer::CreateBrush(const wxBrush& brush )
1593 {
1594     if ( !brush.Ok() || brush.GetStyle() == wxTRANSPARENT )
1595         return wxNullGraphicsBrush;
1596     else
1597     {
1598         wxGraphicsBrush p;
1599         p.SetRefData(new wxCairoBrushData( this, brush ));
1600         return p;
1601     }
1602 }
1603
1604 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1605 wxGraphicsBrush wxCairoRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1606                                                                       const wxColour&c1, const wxColour&c2)
1607 {
1608     wxGraphicsBrush p;
1609     wxCairoBrushData* d = new wxCairoBrushData( this );
1610     d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
1611     p.SetRefData(d);
1612     return p;
1613 }
1614
1615 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1616 // with radius r and color cColor
1617 wxGraphicsBrush wxCairoRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1618                                                                       const wxColour &oColor, const wxColour &cColor)
1619 {
1620     wxGraphicsBrush p;
1621     wxCairoBrushData* d = new wxCairoBrushData( this );
1622     d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
1623     p.SetRefData(d);
1624     return p;
1625 }
1626
1627 // sets the font
1628 wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour &col )
1629 {
1630     if ( font.Ok() )
1631     {
1632         wxGraphicsFont p;
1633         p.SetRefData(new wxCairoFontData( this , font, col ));
1634         return p;
1635     }
1636     else
1637         return wxNullGraphicsFont;
1638 }
1639
1640 #endif  // wxUSE_GRAPHICS_CONTEXT