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/osx/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     wxCairoContext( wxGraphicsRenderer* renderer, const wxPrinterDC& dc );
 329 #ifdef __WXGTK__
 330     wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable );
 331 #endif
 332     wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context );
 333     wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window);
 334     wxCairoContext();
 335     virtual ~wxCairoContext();
 336
 337     virtual bool ShouldOffset() const
 338     {
 339         int penwidth = 0 ;
 340         if ( !m_pen.IsNull() )
 341         {
 342             penwidth = (int)((wxCairoPenData*)m_pen.GetRefData())->GetWidth();
 343             if ( penwidth == 0 )
 344                 penwidth = 1;
 345         }
 346         return ( penwidth % 2 ) == 1;
 347     }
 348
 349     virtual void Clip( const wxRegion &region );
 350
 351     // clips drawings to the rect
 352     virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 353
 354     // resets the clipping to original extent
 355     virtual void ResetClip();
 356
 357     virtual void * GetNativeContext();
 358
 359     virtual void StrokePath( const wxGraphicsPath& p );
 360     virtual void FillPath( const wxGraphicsPath& p , int fillStyle = wxWINDING_RULE );
 361
 362     virtual void Translate( wxDouble dx , wxDouble dy );
 363     virtual void Scale( wxDouble xScale , wxDouble yScale );
 364     virtual void Rotate( wxDouble angle );
 365
 366     // concatenates this transform with the current transform of this context
 367     virtual void ConcatTransform( const wxGraphicsMatrix& matrix );
 368
 369     // sets the transform of this context
 370     virtual void SetTransform( const wxGraphicsMatrix& matrix );
 371
 372     // gets the matrix of this context
 373     virtual wxGraphicsMatrix GetTransform() const;
 374
 375     virtual void DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 376     virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h );
 377     virtual void PushState();
 378     virtual void PopState();
 379
 380     virtual void DrawText( const wxString &str, wxDouble x, wxDouble y);
 381     virtual void GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
 382                                 wxDouble *descent, wxDouble *externalLeading ) const;
 383     virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const;
 384
 385 private:
 386     void Init(cairo_t *context);
 387
 388     cairo_t* m_context;
 389 };
 390
 391 //-----------------------------------------------------------------------------
 392 // wxCairoPenData implementation
 393 //-----------------------------------------------------------------------------
 394
 395 wxCairoPenData::~wxCairoPenData()
 396 {
 397     delete[] m_userLengths;
 398 }
 399
 400 void wxCairoPenData::Init()
 401 {
 402     m_lengths = NULL;
 403     m_userLengths = NULL;
 404     m_width = 0;
 405     m_count = 0;
 406 }
 407
 408 wxCairoPenData::wxCairoPenData( wxGraphicsRenderer* renderer, const wxPen &pen )
 409 : wxGraphicsObjectRefData(renderer)
 410 {
 411     Init();
 412     m_pen = pen;
 413     m_width = m_pen.GetWidth();
 414     if (m_width <= 0.0)
 415         m_width = 0.1;
 416
 417     m_red = m_pen.GetColour().Red()/255.0;
 418     m_green = m_pen.GetColour().Green()/255.0;
 419     m_blue = m_pen.GetColour().Blue()/255.0;
 420     m_alpha = m_pen.GetColour().Alpha()/255.0;
 421
 422     switch ( m_pen.GetCap() )
 423     {
 424     case wxCAP_ROUND :
 425         m_cap = CAIRO_LINE_CAP_ROUND;
 426         break;
 427
 428     case wxCAP_PROJECTING :
 429         m_cap = CAIRO_LINE_CAP_SQUARE;
 430         break;
 431
 432     case wxCAP_BUTT :
 433         m_cap = CAIRO_LINE_CAP_BUTT;
 434         break;
 435
 436     default :
 437         m_cap = CAIRO_LINE_CAP_BUTT;
 438         break;
 439     }
 440
 441     switch ( m_pen.GetJoin() )
 442     {
 443     case wxJOIN_BEVEL :
 444         m_join = CAIRO_LINE_JOIN_BEVEL;
 445         break;
 446
 447     case wxJOIN_MITER :
 448         m_join = CAIRO_LINE_JOIN_MITER;
 449         break;
 450
 451     case wxJOIN_ROUND :
 452         m_join = CAIRO_LINE_JOIN_ROUND;
 453         break;
 454
 455     default :
 456         m_join = CAIRO_LINE_JOIN_MITER;
 457         break;
 458     }
 459
 460     const double dashUnit = m_width < 1.0 ? 1.0 : m_width;
 461     const double dotted[] =
 462     {
 463         dashUnit , dashUnit + 2.0
 464     };
 465     static const double short_dashed[] =
 466     {
 467         9.0 , 6.0
 468     };
 469     static const double dashed[] =
 470     {
 471         19.0 , 9.0
 472     };
 473     static const double dotted_dashed[] =
 474     {
 475         9.0 , 6.0 , 3.0 , 3.0
 476     };
 477
 478     switch ( m_pen.GetStyle() )
 479     {
 480     case wxSOLID :
 481         break;
 482
 483     case wxDOT :
 484         m_count = WXSIZEOF(dotted);
 485         m_userLengths = new double[ m_count ] ;
 486         memcpy( m_userLengths, dotted, sizeof(dotted) );
 487         m_lengths = m_userLengths;
 488         break;
 489
 490     case wxLONG_DASH :
 491         m_lengths = dashed ;
 492         m_count = WXSIZEOF(dashed);
 493         break;
 494
 495     case wxSHORT_DASH :
 496         m_lengths = short_dashed ;
 497         m_count = WXSIZEOF(short_dashed);
 498         break;
 499
 500     case wxDOT_DASH :
 501         m_lengths = dotted_dashed ;
 502         m_count = WXSIZEOF(dotted_dashed);
 503         break;
 504
 505     case wxUSER_DASH :
 506         {
 507             wxDash *wxdashes ;
 508             m_count = m_pen.GetDashes( &wxdashes ) ;
 509             if ((wxdashes != NULL) && (m_count > 0))
 510             {
 511                 m_userLengths = new double[m_count] ;
 512                 for ( int i = 0 ; i < m_count ; ++i )
 513                 {
 514                     m_userLengths[i] = wxdashes[i] * dashUnit ;
 515
 516                     if ( i % 2 == 1 && m_userLengths[i] < dashUnit + 2.0 )
 517                         m_userLengths[i] = dashUnit + 2.0 ;
 518                     else if ( i % 2 == 0 && m_userLengths[i] < dashUnit )
 519                         m_userLengths[i] = dashUnit ;
 520                 }
 521             }
 522             m_lengths = m_userLengths ;
 523         }
 524         break;
 525     case wxSTIPPLE :
 526         {
 527             /*
 528             wxBitmap* bmp = pen.GetStipple();
 529             if ( bmp && bmp->Ok() )
 530             {
 531             wxDELETE( m_penImage );
 532             wxDELETE( m_penBrush );
 533             m_penImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 534             m_penBrush = new TextureBrush(m_penImage);
 535             m_pen->SetBrush( m_penBrush );
 536             }
 537             */
 538         }
 539         break;
 540     default :
 541         if ( m_pen.GetStyle() >= wxFIRST_HATCH && m_pen.GetStyle() <= wxLAST_HATCH )
 542         {
 543             /*
 544             wxDELETE( m_penBrush );
 545             HatchStyle style = HatchStyleHorizontal;
 546             switch( pen.GetStyle() )
 547             {
 548             case wxBDIAGONAL_HATCH :
 549             style = HatchStyleBackwardDiagonal;
 550             break ;
 551             case wxCROSSDIAG_HATCH :
 552             style = HatchStyleDiagonalCross;
 553             break ;
 554             case wxFDIAGONAL_HATCH :
 555             style = HatchStyleForwardDiagonal;
 556             break ;
 557             case wxCROSS_HATCH :
 558             style = HatchStyleCross;
 559             break ;
 560             case wxHORIZONTAL_HATCH :
 561             style = HatchStyleHorizontal;
 562             break ;
 563             case wxVERTICAL_HATCH :
 564             style = HatchStyleVertical;
 565             break ;
 566
 567             }
 568             m_penBrush = new HatchBrush(style,Color( pen.GetColour().Alpha() , pen.GetColour().Red() ,
 569             pen.GetColour().Green() , pen.GetColour().Blue() ), Color.Transparent );
 570             m_pen->SetBrush( m_penBrush )
 571             */
 572         }
 573         break;
 574     }
 575 }
 576
 577 void wxCairoPenData::Apply( wxGraphicsContext* context )
 578 {
 579     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 580     cairo_set_line_width(ctext,m_width);
 581     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 582     cairo_set_line_cap(ctext,m_cap);
 583     cairo_set_line_join(ctext,m_join);
 584     cairo_set_dash(ctext,(double*)m_lengths,m_count,0.0);
 585 }
 586
 587 //-----------------------------------------------------------------------------
 588 // wxCairoBrushData implementation
 589 //-----------------------------------------------------------------------------
 590
 591 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer )
 592   : wxGraphicsObjectRefData( renderer )
 593 {
 594     Init();
 595 }
 596
 597 wxCairoBrushData::wxCairoBrushData( wxGraphicsRenderer* renderer, const wxBrush &brush )
 598   : wxGraphicsObjectRefData(renderer)
 599 {
 600     Init();
 601
 602     m_red = brush.GetColour().Red()/255.0;
 603     m_green = brush.GetColour().Green()/255.0;
 604     m_blue = brush.GetColour().Blue()/255.0;
 605     m_alpha = brush.GetColour().Alpha()/255.0;
 606     /*
 607     if ( brush.GetStyle() == wxSOLID)
 608     {
 609     m_brush = new SolidBrush( Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 610     brush.GetColour().Green() , brush.GetColour().Blue() ) );
 611     }
 612     else if ( brush.IsHatch() )
 613     {
 614     HatchStyle style = HatchStyleHorizontal;
 615     switch( brush.GetStyle() )
 616     {
 617     case wxBDIAGONAL_HATCH :
 618     style = HatchStyleBackwardDiagonal;
 619     break ;
 620     case wxCROSSDIAG_HATCH :
 621     style = HatchStyleDiagonalCross;
 622     break ;
 623     case wxFDIAGONAL_HATCH :
 624     style = HatchStyleForwardDiagonal;
 625     break ;
 626     case wxCROSS_HATCH :
 627     style = HatchStyleCross;
 628     break ;
 629     case wxHORIZONTAL_HATCH :
 630     style = HatchStyleHorizontal;
 631     break ;
 632     case wxVERTICAL_HATCH :
 633     style = HatchStyleVertical;
 634     break ;
 635
 636     }
 637     m_brush = new HatchBrush(style,Color( brush.GetColour().Alpha() , brush.GetColour().Red() ,
 638     brush.GetColour().Green() , brush.GetColour().Blue() ), Color.Transparent );
 639     }
 640     else
 641     {
 642     wxBitmap* bmp = brush.GetStipple();
 643     if ( bmp && bmp->Ok() )
 644     {
 645     wxDELETE( m_brushImage );
 646     m_brushImage = Bitmap::FromHBITMAP((HBITMAP)bmp->GetHBITMAP(),(HPALETTE)bmp->GetPalette()->GetHPALETTE());
 647     m_brush = new TextureBrush(m_brushImage);
 648     }
 649     }
 650     */
 651 }
 652
 653 wxCairoBrushData::~wxCairoBrushData ()
 654 {
 655     if (m_brushPattern)
 656         cairo_pattern_destroy(m_brushPattern);
 657 }
 658
 659 void wxCairoBrushData::Apply( wxGraphicsContext* context )
 660 {
 661     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 662     if ( m_brushPattern )
 663     {
 664         cairo_set_source(ctext,m_brushPattern);
 665     }
 666     else
 667     {
 668         cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 669     }
 670 }
 671
 672 void wxCairoBrushData::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
 673         const wxColour&c1, const wxColour&c2 )
 674 {
 675     m_brushPattern = cairo_pattern_create_linear(x1,y1,x2,y2);
 676     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,c1.Red()/255.0,
 677         c1.Green()/255.0, c1.Blue()/255.0,c1.Alpha()/255.0);
 678     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,c2.Red()/255.0,
 679         c2.Green()/255.0, c2.Blue()/255.0,c2.Alpha()/255.0);
 680     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 681 }
 682
 683 void wxCairoBrushData::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
 684         const wxColour &oColor, const wxColour &cColor )
 685 {
 686     m_brushPattern = cairo_pattern_create_radial(xo,yo,0.0,xc,yc,radius);
 687     cairo_pattern_add_color_stop_rgba(m_brushPattern,0.0,oColor.Red()/255.0,
 688         oColor.Green()/255.0, oColor.Blue()/255.0,oColor.Alpha()/255.0);
 689     cairo_pattern_add_color_stop_rgba(m_brushPattern,1.0,cColor.Red()/255.0,
 690         cColor.Green()/255.0, cColor.Blue()/255.0,cColor.Alpha()/255.0);
 691     wxASSERT_MSG(cairo_pattern_status(m_brushPattern) == CAIRO_STATUS_SUCCESS, wxT("Couldn't create cairo pattern"));
 692 }
 693
 694 void wxCairoBrushData::Init()
 695 {
 696     m_brushPattern = NULL;
 697 }
 698
 699 //-----------------------------------------------------------------------------
 700 // wxCairoFontData implementation
 701 //-----------------------------------------------------------------------------
 702
 703 wxCairoFontData::wxCairoFontData( wxGraphicsRenderer* renderer, const wxFont &font,
 704                          const wxColour& col ) : wxGraphicsObjectRefData(renderer)
 705 {
 706     m_red = col.Red()/255.0;
 707     m_green = col.Green()/255.0;
 708     m_blue = col.Blue()/255.0;
 709     m_alpha = col.Alpha()/255.0;
 710     m_size = font.GetPointSize();
 711
 712 #ifdef __WXMAC__
 713     m_font = cairo_atsui_font_face_create_for_atsu_font_id( font.MacGetATSUFontID() );
 714 #elif defined(__WXGTK__)
 715     m_font = pango_font_description_copy( font.GetNativeFontInfo()->description );
 716 #else
 717     m_fontName = font.GetFaceName().mb_str(wxConvUTF8);
 718     m_slant = font.GetStyle() == wxFONTSTYLE_ITALIC ? CAIRO_FONT_SLANT_ITALIC:CAIRO_FONT_SLANT_NORMAL;
 719     m_weight = font.GetWeight() == wxFONTWEIGHT_BOLD ? CAIRO_FONT_WEIGHT_BOLD:CAIRO_FONT_WEIGHT_NORMAL;
 720 #endif
 721 }
 722
 723 wxCairoFontData::~wxCairoFontData()
 724 {
 725 #ifdef __WXMAC__
 726     cairo_font_face_destroy( m_font );
 727 #elif defined(__WXGTK__)
 728     pango_font_description_free( m_font );
 729 #else
 730 #endif
 731 }
 732
 733 void wxCairoFontData::Apply( wxGraphicsContext* context )
 734 {
 735     cairo_t * ctext = (cairo_t*) context->GetNativeContext();
 736     cairo_set_source_rgba(ctext,m_red,m_green, m_blue,m_alpha);
 737 #ifdef __WXGTK__
 738     // the rest is done using Pango layouts
 739 #elif defined(__WXMAC__)
 740     cairo_set_font_face(ctext, m_font);
 741     cairo_set_font_size(ctext, m_size );
 742 #else
 743     cairo_select_font_face(ctext, m_fontName, m_slant, m_weights );
 744     cairo_set_font_size(ctext, m_size );
 745 #endif
 746 }
 747
 748 //-----------------------------------------------------------------------------
 749 // wxCairoPathData implementation
 750 //-----------------------------------------------------------------------------
 751
 752 wxCairoPathData::wxCairoPathData( wxGraphicsRenderer* renderer, cairo_t* pathcontext)
 753     : wxGraphicsPathData(renderer)
 754 {
 755     if (pathcontext)
 756     {
 757         m_pathContext = pathcontext;
 758     }
 759     else
 760     {
 761         cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 762         m_pathContext = cairo_create(surface);
 763         cairo_surface_destroy (surface);
 764     }
 765 }
 766
 767 wxCairoPathData::~wxCairoPathData()
 768 {
 769     cairo_destroy(m_pathContext);
 770 }
 771
 772 wxGraphicsObjectRefData *wxCairoPathData::Clone() const
 773 {
 774     cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,1,1);
 775     cairo_t* pathcontext = cairo_create(surface);
 776     cairo_surface_destroy (surface);
 777
 778     cairo_path_t* path = cairo_copy_path(m_pathContext);
 779     cairo_append_path(pathcontext, path);
 780     cairo_path_destroy(path);
 781     return new wxCairoPathData( GetRenderer() ,pathcontext);
 782 }
 783
 784
 785 void* wxCairoPathData::GetNativePath() const
 786 {
 787     return cairo_copy_path(m_pathContext) ;
 788 }
 789
 790 void wxCairoPathData::UnGetNativePath(void *p) const
 791 {
 792     cairo_path_destroy((cairo_path_t*)p);
 793 }
 794
 795 //
 796 // The Primitives
 797 //
 798
 799 void wxCairoPathData::MoveToPoint( wxDouble x , wxDouble y )
 800 {
 801     cairo_move_to(m_pathContext,x,y);
 802 }
 803
 804 void wxCairoPathData::AddLineToPoint( wxDouble x , wxDouble y )
 805 {
 806     cairo_line_to(m_pathContext,x,y);
 807 }
 808
 809 void wxCairoPathData::AddPath( const wxGraphicsPathData* path )
 810 {
 811     cairo_path_t* p = (cairo_path_t*)path->GetNativePath();
 812     cairo_append_path(m_pathContext, p);
 813     UnGetNativePath(p);
 814 }
 815
 816 void wxCairoPathData::CloseSubpath()
 817 {
 818     cairo_close_path(m_pathContext);
 819 }
 820
 821 void wxCairoPathData::AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y )
 822 {
 823     cairo_curve_to(m_pathContext,cx1,cy1,cx2,cy2,x,y);
 824 }
 825
 826 // gets the last point of the current path, (0,0) if not yet set
 827 void wxCairoPathData::GetCurrentPoint( wxDouble* x, wxDouble* y) const
 828 {
 829     double dx,dy;
 830     cairo_get_current_point(m_pathContext,&dx,&dy);
 831     if (x)
 832         *x = dx;
 833     if (y)
 834         *y = dy;
 835 }
 836
 837 void wxCairoPathData::AddArc( wxDouble x, wxDouble y, wxDouble r, double startAngle, double endAngle, bool clockwise )
 838 {
 839     // as clockwise means positive in our system (y pointing downwards)
 840     // TODO make this interpretation dependent of the
 841     // real device trans
 842     if ( clockwise||(endAngle-startAngle)>=2*M_PI)
 843         cairo_arc(m_pathContext,x,y,r,startAngle,endAngle);
 844     else
 845         cairo_arc_negative(m_pathContext,x,y,r,startAngle,endAngle);
 846 }
 847
 848 // transforms each point of this path by the matrix
 849 void wxCairoPathData::Transform( const wxGraphicsMatrixData* matrix )
 850 {
 851     // as we don't have a true path object, we have to apply the inverse
 852     // matrix to the context
 853     cairo_matrix_t m = *((cairo_matrix_t*) matrix->GetNativeMatrix());
 854     cairo_matrix_invert( &m );
 855     cairo_transform(m_pathContext,&m);
 856 }
 857
 858 // gets the bounding box enclosing all points (possibly including control points)
 859 void wxCairoPathData::GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h) const
 860 {
 861     double x1,y1,x2,y2;
 862
 863     cairo_stroke_extents( m_pathContext, &x1, &y1, &x2, &y2 );
 864     if ( x2 < x1 )
 865     {
 866         *x = x2;
 867         *w = x1-x2;
 868     }
 869     else
 870     {
 871         *x = x1;
 872         *w = x2-x1;
 873     }
 874
 875     if( y2 < y1 )
 876     {
 877         *y = y2;
 878         *h = y1-y2;
 879     }
 880     else
 881     {
 882         *y = y1;
 883         *h = y2-y1;
 884     }
 885 }
 886
 887 bool wxCairoPathData::Contains( wxDouble x, wxDouble y, int WXUNUSED(fillStyle) ) const
 888 {
 889     return cairo_in_stroke( m_pathContext, x, y) != 0;
 890 }
 891
 892 //-----------------------------------------------------------------------------
 893 // wxCairoMatrixData implementation
 894 //-----------------------------------------------------------------------------
 895
 896 wxCairoMatrixData::wxCairoMatrixData(wxGraphicsRenderer* renderer, const cairo_matrix_t* matrix )
 897     : wxGraphicsMatrixData(renderer)
 898 {
 899     if ( matrix )
 900         m_matrix = *matrix;
 901 }
 902
 903 wxCairoMatrixData::~wxCairoMatrixData()
 904 {
 905     // nothing to do
 906 }
 907
 908 wxGraphicsObjectRefData *wxCairoMatrixData::Clone() const
 909 {
 910     return new wxCairoMatrixData(GetRenderer(),&m_matrix);
 911 }
 912
 913 // concatenates the matrix
 914 void wxCairoMatrixData::Concat( const wxGraphicsMatrixData *t )
 915 {
 916     cairo_matrix_multiply( &m_matrix, &m_matrix, (cairo_matrix_t*) t->GetNativeMatrix());
 917 }
 918
 919 // sets the matrix to the respective values
 920 void wxCairoMatrixData::Set(wxDouble a, wxDouble b, wxDouble c, wxDouble d,
 921                         wxDouble tx, wxDouble ty)
 922 {
 923     cairo_matrix_init( &m_matrix, a, b, c, d, tx, ty);
 924 }
 925
 926 // gets the component valuess of the matrix
 927 void wxCairoMatrixData::Get(wxDouble* a, wxDouble* b,  wxDouble* c,
 928                             wxDouble* d, wxDouble* tx, wxDouble* ty) const
 929 {
 930     if (a)  *a = m_matrix.xx;
 931     if (b)  *b = m_matrix.yx;
 932     if (c)  *c = m_matrix.xy;
 933     if (d)  *d = m_matrix.yy;
 934     if (tx) *tx= m_matrix.x0;
 935     if (ty) *ty= m_matrix.y0;
 936 }
 937
 938 // makes this the inverse matrix
 939 void wxCairoMatrixData::Invert()
 940 {
 941     cairo_matrix_invert( &m_matrix );
 942 }
 943
 944 // returns true if the elements of the transformation matrix are equal ?
 945 bool wxCairoMatrixData::IsEqual( const wxGraphicsMatrixData* t) const
 946 {
 947     const cairo_matrix_t* tm = (cairo_matrix_t*) t->GetNativeMatrix();
 948     return (
 949         m_matrix.xx == tm->xx &&
 950         m_matrix.yx == tm->yx &&
 951         m_matrix.xy == tm->xy &&
 952         m_matrix.yy == tm->yy &&
 953         m_matrix.x0 == tm->x0 &&
 954         m_matrix.y0 == tm->y0 ) ;
 955 }
 956
 957 // return true if this is the identity matrix
 958 bool wxCairoMatrixData::IsIdentity() const
 959 {
 960     return ( m_matrix.xx == 1 && m_matrix.yy == 1 &&
 961         m_matrix.yx == 0 && m_matrix.xy == 0 && m_matrix.x0 == 0 && m_matrix.y0 == 0);
 962 }
 963
 964 //
 965 // transformation
 966 //
 967
 968 // add the translation to this matrix
 969 void wxCairoMatrixData::Translate( wxDouble dx , wxDouble dy )
 970 {
 971     cairo_matrix_translate( &m_matrix, dx, dy) ;
 972 }
 973
 974 // add the scale to this matrix
 975 void wxCairoMatrixData::Scale( wxDouble xScale , wxDouble yScale )
 976 {
 977     cairo_matrix_scale( &m_matrix, xScale, yScale) ;
 978 }
 979
 980 // add the rotation to this matrix (radians)
 981 void wxCairoMatrixData::Rotate( wxDouble angle )
 982 {
 983     cairo_matrix_rotate( &m_matrix, angle) ;
 984 }
 985
 986 //
 987 // apply the transforms
 988 //
 989
 990 // applies that matrix to the point
 991 void wxCairoMatrixData::TransformPoint( wxDouble *x, wxDouble *y ) const
 992 {
 993     double lx = *x, ly = *y ;
 994     cairo_matrix_transform_point( &m_matrix, &lx, &ly);
 995     *x = lx;
 996     *y = ly;
 997 }
 998
 999 // applies the matrix except for translations
1000 void wxCairoMatrixData::TransformDistance( wxDouble *dx, wxDouble *dy ) const
1001 {
1002     double lx = *dx, ly = *dy ;
1003     cairo_matrix_transform_distance( &m_matrix, &lx, &ly);
1004     *dx = lx;
1005     *dy = ly;
1006 }
1007
1008 // returns the native representation
1009 void * wxCairoMatrixData::GetNativeMatrix() const
1010 {
1011     return (void*) &m_matrix;
1012 }
1013
1014 //-----------------------------------------------------------------------------
1015 // wxCairoContext implementation
1016 //-----------------------------------------------------------------------------
1017
1018 class wxCairoOffsetHelper
1019 {
1020 public :
1021     wxCairoOffsetHelper( cairo_t* ctx , bool offset )
1022     {
1023         m_ctx = ctx;
1024         m_offset = offset;
1025         if ( m_offset )
1026              cairo_translate( m_ctx, 0.5, 0.5 );
1027     }
1028     ~wxCairoOffsetHelper( )
1029     {
1030         if ( m_offset )
1031             cairo_translate( m_ctx, -0.5, -0.5 );
1032     }
1033 public :
1034     cairo_t* m_ctx;
1035     bool m_offset;
1036 } ;
1037
1038 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxPrinterDC& dc )
1039 : wxGraphicsContext(renderer)
1040 {
1041 #ifdef __WXGTK20__
1042     const wxDCImpl *impl = dc.GetImpl();
1043     Init( (cairo_t*) impl->GetCairoContext() );
1044
1045     wxPoint org = dc.GetDeviceOrigin();
1046     cairo_translate( m_context, org.x, org.y );
1047
1048     double sx,sy;
1049     dc.GetUserScale( &sx, &sy );
1050     cairo_scale( m_context, sx, sy );
1051
1052     org = dc.GetLogicalOrigin();
1053     cairo_translate( m_context, -org.x, -org.y );
1054 #endif
1055 }
1056
1057 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxWindowDC& dc )
1058 : wxGraphicsContext(renderer)
1059 {
1060 #ifdef __WXGTK20__
1061     wxGTKDCImpl *impldc = (wxGTKDCImpl*) dc.GetImpl();
1062     Init( gdk_cairo_create( impldc->GetGDKWindow() ) );
1063
1064 #if 0
1065     wxGraphicsMatrix matrix = CreateMatrix();
1066
1067     wxPoint org = dc.GetDeviceOrigin();
1068     matrix.Translate( org.x, org.y );
1069
1070     org = dc.GetLogicalOrigin();
1071     matrix.Translate( -org.x, -org.y );
1072
1073     double sx,sy;
1074     dc.GetUserScale( &sx, &sy );
1075     matrix.Scale( sx, sy );
1076
1077     ConcatTransform( matrix );
1078 #endif
1079 #endif
1080
1081 #ifdef __WXMAC__
1082     int width, height;
1083     dc.GetSize( &width, &height );
1084     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1085     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1086     Init( cairo_create( surface ) );
1087     cairo_surface_destroy( surface );
1088 #endif
1089 }
1090
1091 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, const wxMemoryDC& dc )
1092 : wxGraphicsContext(renderer)
1093 {
1094 #ifdef __WXGTK20__
1095     wxGTKDCImpl *impldc = (wxGTKDCImpl*) dc.GetImpl();
1096     Init( gdk_cairo_create( impldc->GetGDKWindow() ) );
1097
1098 #if 0
1099     wxGraphicsMatrix matrix = CreateMatrix();
1100
1101     wxPoint org = dc.GetDeviceOrigin();
1102     matrix.Translate( org.x, org.y );
1103
1104     org = dc.GetLogicalOrigin();
1105     matrix.Translate( -org.x, -org.y );
1106
1107     double sx,sy;
1108     dc.GetUserScale( &sx, &sy );
1109     matrix.Scale( sx, sy );
1110
1111     ConcatTransform( matrix );
1112 #endif
1113 #endif
1114
1115 #ifdef __WXMAC__
1116     int width, height;
1117     dc.GetSize( &width, &height );
1118     CGContextRef cgcontext = (CGContextRef)dc.GetWindow()->MacGetCGContextRef();
1119     cairo_surface_t* surface = cairo_quartz_surface_create_for_cg_context(cgcontext, width, height);
1120     Init( cairo_create( surface ) );
1121     cairo_surface_destroy( surface );
1122 #endif
1123 }
1124
1125 #ifdef __WXGTK20__
1126 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, GdkDrawable *drawable )
1127 : wxGraphicsContext(renderer)
1128 {
1129     Init( gdk_cairo_create( drawable ) );
1130 }
1131 #endif
1132
1133 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, cairo_t *context )
1134 : wxGraphicsContext(renderer)
1135 {
1136     Init( context );
1137 }
1138
1139 wxCairoContext::wxCairoContext( wxGraphicsRenderer* renderer, wxWindow *window)
1140 : wxGraphicsContext(renderer)
1141 {
1142 #ifdef __WXGTK__
1143     // something along these lines (copied from dcclient)
1144
1145     // Some controls don't have m_wxwindow - like wxStaticBox, but the user
1146     // code should still be able to create wxClientDCs for them, so we will
1147     // use the parent window here then.
1148     if (window->m_wxwindow == NULL)
1149     {
1150         window = window->GetParent();
1151     }
1152
1153     wxASSERT_MSG( window->m_wxwindow, wxT("wxCairoContext needs a widget") );
1154
1155     Init(gdk_cairo_create(window->GTKGetDrawingWindow()));
1156 #endif
1157 }
1158
1159 wxCairoContext::~wxCairoContext()
1160 {
1161     if ( m_context )
1162     {
1163         PopState();
1164         PopState();
1165         cairo_destroy(m_context);
1166     }
1167 }
1168
1169 void wxCairoContext::Init(cairo_t *context)
1170 {
1171     m_context = context ;
1172     PushState();
1173     PushState();
1174 }
1175
1176
1177 void wxCairoContext::Clip( const wxRegion& region )
1178 {
1179     // Create a path with all the rectangles in the region
1180     wxGraphicsPath path = GetRenderer()->CreatePath();
1181     wxRegionIterator ri(region);
1182     while (ri)
1183     {
1184         path.AddRectangle(ri.GetX(), ri.GetY(), ri.GetW(), ri.GetH());
1185         ++ri;
1186     }
1187
1188     // Put it in the context
1189     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1190     cairo_append_path(m_context, cp);
1191
1192     // clip to that path
1193     cairo_clip(m_context);
1194     path.UnGetNativePath(cp);
1195 }
1196
1197 void wxCairoContext::Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1198 {
1199     // Create a path with this rectangle
1200     wxGraphicsPath path = GetRenderer()->CreatePath();
1201     path.AddRectangle(x,y,w,h);
1202
1203     // Put it in the context
1204     cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1205     cairo_append_path(m_context, cp);
1206
1207     // clip to that path
1208     cairo_clip(m_context);
1209     path.UnGetNativePath(cp);
1210 }
1211
1212 void wxCairoContext::ResetClip()
1213 {
1214     cairo_reset_clip(m_context);
1215 }
1216
1217
1218 void wxCairoContext::StrokePath( const wxGraphicsPath& path )
1219 {
1220     if ( !m_pen.IsNull() )
1221     {
1222         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1223         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1224         cairo_append_path(m_context,cp);
1225         ((wxCairoPenData*)m_pen.GetRefData())->Apply(this);
1226         cairo_stroke(m_context);
1227         path.UnGetNativePath(cp);
1228     }
1229 }
1230
1231 void wxCairoContext::FillPath( const wxGraphicsPath& path , int fillStyle )
1232 {
1233     if ( !m_brush.IsNull() )
1234     {
1235         wxCairoOffsetHelper helper( m_context, ShouldOffset() ) ;
1236         cairo_path_t* cp = (cairo_path_t*) path.GetNativePath() ;
1237         cairo_append_path(m_context,cp);
1238         ((wxCairoBrushData*)m_brush.GetRefData())->Apply(this);
1239         cairo_set_fill_rule(m_context,fillStyle==wxODDEVEN_RULE ? CAIRO_FILL_RULE_EVEN_ODD : CAIRO_FILL_RULE_WINDING);
1240         cairo_fill(m_context);
1241         path.UnGetNativePath(cp);
1242     }
1243 }
1244
1245 void wxCairoContext::Rotate( wxDouble angle )
1246 {
1247     cairo_rotate(m_context,angle);
1248 }
1249
1250 void wxCairoContext::Translate( wxDouble dx , wxDouble dy )
1251 {
1252     cairo_translate(m_context,dx,dy);
1253 }
1254
1255 void wxCairoContext::Scale( wxDouble xScale , wxDouble yScale )
1256 {
1257     cairo_scale(m_context,xScale,yScale);
1258 }
1259
1260 // concatenates this transform with the current transform of this context
1261 void wxCairoContext::ConcatTransform( const wxGraphicsMatrix& matrix )
1262 {
1263     cairo_transform(m_context,(const cairo_matrix_t *) matrix.GetNativeMatrix());
1264 }
1265
1266 // sets the transform of this context
1267 void wxCairoContext::SetTransform( const wxGraphicsMatrix& matrix )
1268 {
1269     cairo_set_matrix(m_context,(const cairo_matrix_t*) matrix.GetNativeMatrix());
1270 }
1271
1272 // gets the matrix of this context
1273 wxGraphicsMatrix wxCairoContext::GetTransform() const
1274 {
1275     wxGraphicsMatrix matrix = CreateMatrix();
1276     cairo_get_matrix(m_context,(cairo_matrix_t*) matrix.GetNativeMatrix());
1277     return matrix;
1278 }
1279
1280
1281
1282 void wxCairoContext::PushState()
1283 {
1284     cairo_save(m_context);
1285 }
1286
1287 void wxCairoContext::PopState()
1288 {
1289     cairo_restore(m_context);
1290 }
1291
1292 void wxCairoContext::DrawBitmap( const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1293 {
1294     wxCHECK_RET( bmp.IsOk(), wxT("Invalid bitmap in wxCairoContext::DrawBitmap"));
1295
1296     cairo_surface_t* surface;
1297     int bw = bmp.GetWidth();
1298     int bh = bmp.GetHeight();
1299     wxBitmap bmpSource = bmp;  // we need a non-const instance
1300     unsigned char* buffer = new unsigned char[bw*bh*4];
1301     wxUint32* data = (wxUint32*)buffer;
1302
1303     // Create a surface object and copy the bitmap pixel data to it.  if the
1304     // image has alpha (or a mask represented as alpha) then we'll use a
1305     // different format and iterator than if it doesn't...
1306     if (bmpSource.HasAlpha() || bmpSource.GetMask())
1307     {
1308         surface = cairo_image_surface_create_for_data(
1309             buffer, CAIRO_FORMAT_ARGB32, bw, bh, bw*4);
1310         wxAlphaPixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1311         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1312
1313         wxAlphaPixelData::Iterator p(pixData);
1314         for (int y=0; y<bh; y++)
1315         {
1316             wxAlphaPixelData::Iterator rowStart = p;
1317             for (int x=0; x<bw; x++)
1318             {
1319                 // Each pixel in CAIRO_FORMAT_ARGB32 is a 32-bit quantity,
1320                 // with alpha in the upper 8 bits, then red, then green, then
1321                 // blue. The 32-bit quantities are stored native-endian.
1322                 // Pre-multiplied alpha is used.
1323                 unsigned char alpha = p.Alpha();
1324                 if (alpha == 0)
1325                     *data = 0;
1326                 else
1327                     *data = ( alpha                      << 24
1328                               | (p.Red() * alpha/255)    << 16
1329                               | (p.Green() * alpha/255)  <<  8
1330                               | (p.Blue() * alpha/255) );
1331                 ++data;
1332                 ++p;
1333             }
1334             p = rowStart;
1335             p.OffsetY(pixData, 1);
1336         }
1337     }
1338     else  // no alpha
1339     {
1340         surface = cairo_image_surface_create_for_data(
1341             buffer, CAIRO_FORMAT_RGB24, bw, bh, bw*4);
1342         wxNativePixelData pixData(bmpSource, wxPoint(0,0), wxSize(bw, bh));
1343         wxCHECK_RET( pixData, wxT("Failed to gain raw access to bitmap data."));
1344
1345         wxNativePixelData::Iterator p(pixData);
1346         for (int y=0; y<bh; y++)
1347         {
1348             wxNativePixelData::Iterator rowStart = p;
1349             for (int x=0; x<bw; x++)
1350             {
1351                 // Each pixel in CAIRO_FORMAT_RGB24 is a 32-bit quantity, with
1352                 // the upper 8 bits unused. Red, Green, and Blue are stored in
1353                 // the remaining 24 bits in that order.  The 32-bit quantities
1354                 // are stored native-endian.
1355                 *data = ( p.Red() << 16 | p.Green() << 8 | p.Blue() );
1356                 ++data;
1357                 ++p;
1358             }
1359             p = rowStart;
1360             p.OffsetY(pixData, 1);
1361         }
1362     }
1363
1364
1365     PushState();
1366
1367     // In case we're scaling the image by using a width and height different
1368     // than the bitmap's size create a pattern transformation on the surface and
1369     // draw the transformed pattern.
1370     cairo_pattern_t* pattern = cairo_pattern_create_for_surface(surface);
1371     wxDouble scaleX = w / bw;
1372     wxDouble scaleY = h / bh;
1373     cairo_scale(m_context, scaleX, scaleY);
1374
1375     // prepare to draw the image
1376     cairo_translate(m_context, x, y);
1377     cairo_set_source(m_context, pattern);
1378     // use the original size here since the context is scaled already...
1379     cairo_rectangle(m_context, 0, 0, bw, bh);
1380     // fill the rectangle using the pattern
1381     cairo_fill(m_context);
1382
1383     // clean up
1384     cairo_pattern_destroy(pattern);
1385     cairo_surface_destroy(surface);
1386     delete [] buffer;
1387     PopState();
1388 }
1389
1390 void wxCairoContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h )
1391 {
1392     // An icon is a bitmap on wxGTK, so do this the easy way.  When we want to
1393     // start using the Cairo backend on other platforms then we may need to
1394     // fiddle with this...
1395     DrawBitmap(icon, x, y, w, h);
1396 }
1397
1398
1399 void wxCairoContext::DrawText( const wxString &str, wxDouble x, wxDouble y )
1400 {
1401     if ( m_font.IsNull() || str.empty())
1402         return;
1403
1404 #ifdef __WXGTK__
1405     const wxCharBuffer data = str.utf8_str();
1406     if ( !data )
1407         return;
1408     size_t datalen = strlen(data);
1409     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1410
1411     PangoLayout *layout = pango_cairo_create_layout (m_context);
1412     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1413     pango_layout_set_text(layout, data, datalen);
1414     cairo_move_to(m_context, x, y);
1415     pango_cairo_show_layout (m_context, layout);
1416
1417     g_object_unref (layout);
1418 #else
1419     ((wxCairoFontData*)m_font.GetRefData())->Apply(this);
1420     // Cairo's x,y for drawing text is at the baseline, so we need to adjust
1421     // the position we move to by the ascent.
1422     cairo_font_extents_t fe;
1423     cairo_font_extents(m_context, &fe);
1424     cairo_move_to(m_context, x, y+fe.ascent);
1425
1426     const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1427     cairo_show_text(m_context,buf);
1428 #endif
1429 }
1430
1431 void wxCairoContext::GetTextExtent( const wxString &str, wxDouble *width, wxDouble *height,
1432                                     wxDouble *descent, wxDouble *externalLeading ) const
1433 {
1434     if ( width )
1435         *width = 0;
1436     if ( height )
1437         *height = 0;
1438     if ( descent )
1439         *descent = 0;
1440     if ( externalLeading )
1441         *externalLeading = 0;
1442
1443     if ( m_font.IsNull() || str.empty())
1444         return;
1445
1446 #ifdef __WXGTK__
1447     int w, h;
1448
1449     PangoLayout *layout = pango_cairo_create_layout (m_context);
1450     pango_layout_set_font_description( layout, ((wxCairoFontData*)m_font.GetRefData())->GetFont());
1451     const wxCharBuffer data = str.utf8_str();
1452     if ( !data )
1453     {
1454         return;
1455     }
1456     pango_layout_set_text( layout, data, strlen(data) );
1457     pango_layout_get_pixel_size (layout, &w, &h);
1458     if ( width )
1459         *width = w;
1460     if ( height )
1461         *height = h;
1462     if (descent)
1463     {
1464         PangoLayoutIter *iter = pango_layout_get_iter(layout);
1465         int baseline = pango_layout_iter_get_baseline(iter);
1466         pango_layout_iter_free(iter);
1467         *descent = h - PANGO_PIXELS(baseline);
1468     }
1469     g_object_unref (layout);
1470 #else
1471     ((wxCairoFontData*)m_font.GetRefData())->Apply((wxCairoContext*)this);
1472
1473     if (width)
1474     {
1475         const wxWX2MBbuf buf(str.mb_str(wxConvUTF8));
1476         cairo_text_extents_t te;
1477         cairo_text_extents(m_context, buf, &te);
1478         *width = te.width;
1479     }
1480
1481     if (height || descent || externalLeading)
1482     {
1483         cairo_font_extents_t fe;
1484         cairo_font_extents(m_context, &fe);
1485
1486         // some backends have negative descents
1487
1488         if ( fe.descent < 0 )
1489             fe.descent = -fe.descent;
1490
1491         if ( fe.height < (fe.ascent + fe.descent ) )
1492         {
1493             // some backends are broken re height ... (eg currently ATSUI)
1494             fe.height = fe.ascent + fe.descent;
1495         }
1496
1497         if (height)
1498             *height = fe.height;
1499         if ( descent )
1500             *descent = fe.descent;
1501         if ( externalLeading )
1502             *externalLeading = wxMax(0, fe.height - (fe.ascent + fe.descent));
1503     }
1504 #endif
1505 }
1506
1507 void wxCairoContext::GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const
1508 {
1509     widths.Empty();
1510     widths.Add(0, text.length());
1511
1512     if (text.empty())
1513         return;
1514
1515     // TODO
1516 }
1517
1518 void * wxCairoContext::GetNativeContext()
1519 {
1520     return m_context;
1521 }
1522
1523 //-----------------------------------------------------------------------------
1524 // wxCairoRenderer declaration
1525 //-----------------------------------------------------------------------------
1526
1527 class WXDLLIMPEXP_CORE wxCairoRenderer : public wxGraphicsRenderer
1528 {
1529 public :
1530     wxCairoRenderer() {}
1531
1532     virtual ~wxCairoRenderer() {}
1533
1534     // Context
1535
1536     virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc);
1537     virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc);
1538     virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc);
1539
1540     virtual wxGraphicsContext * CreateContextFromNativeContext( void * context );
1541
1542     virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window );
1543
1544     virtual wxGraphicsContext * CreateContext( wxWindow* window );
1545
1546     virtual wxGraphicsContext * CreateMeasuringContext();
1547
1548     // Path
1549
1550     virtual wxGraphicsPath CreatePath();
1551
1552     // Matrix
1553
1554     virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0,
1555         wxDouble tx=0.0, wxDouble ty=0.0);
1556
1557
1558     virtual wxGraphicsPen CreatePen(const wxPen& pen) ;
1559
1560     virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) ;
1561
1562     // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1563     virtual wxGraphicsBrush CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1564         const wxColour&c1, const wxColour&c2) ;
1565
1566     // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1567     // with radius r and color cColor
1568     virtual wxGraphicsBrush CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1569         const wxColour &oColor, const wxColour &cColor) ;
1570
1571     // sets the font
1572     virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) ;
1573
1574     // create a native bitmap representation
1575 #if 0
1576     virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap )
1577     {
1578       return wxGraphicsBitmap;
1579     }
1580
1581     // create a subimage from a native image representation
1582     virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h  )
1583     {
1584       return wxGraphicsBitmap;
1585     }
1586 #endif
1587
1588 private :
1589     DECLARE_DYNAMIC_CLASS_NO_COPY(wxCairoRenderer)
1590 } ;
1591
1592 //-----------------------------------------------------------------------------
1593 // wxCairoRenderer implementation
1594 //-----------------------------------------------------------------------------
1595
1596 IMPLEMENT_DYNAMIC_CLASS(wxCairoRenderer,wxGraphicsRenderer)
1597
1598 static wxCairoRenderer gs_cairoGraphicsRenderer;
1599 // temporary hack to allow creating a cairo context on any platform
1600 extern wxGraphicsRenderer* gCairoRenderer;
1601 wxGraphicsRenderer* gCairoRenderer = &gs_cairoGraphicsRenderer;
1602
1603 #ifdef __WXGTK__
1604 wxGraphicsRenderer* wxGraphicsRenderer::GetDefaultRenderer()
1605 {
1606     return &gs_cairoGraphicsRenderer;
1607 }
1608 #endif
1609
1610 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxWindowDC& dc)
1611 {
1612     return new wxCairoContext(this,dc);
1613 }
1614
1615 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxMemoryDC& dc)
1616 {
1617     return new wxCairoContext(this,dc);
1618 }
1619
1620 wxGraphicsContext * wxCairoRenderer::CreateContext( const wxPrinterDC& dc)
1621 {
1622 #ifdef __WXGTK20__
1623     const wxDCImpl *impl = dc.GetImpl();
1624     cairo_t* context = (cairo_t*) impl->GetCairoContext();
1625     if (context)
1626        return new wxCairoContext(this,dc);
1627     else
1628 #endif
1629        return NULL;
1630 }
1631
1632 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeContext( void * context )
1633 {
1634     return new wxCairoContext(this,(cairo_t*)context);
1635 }
1636
1637
1638 wxGraphicsContext * wxCairoRenderer::CreateContextFromNativeWindow( void * window )
1639 {
1640 #ifdef __WXGTK__
1641     return new wxCairoContext(this,(GdkDrawable*)window);
1642 #else
1643     return NULL;
1644 #endif
1645 }
1646
1647 wxGraphicsContext * wxCairoRenderer::CreateMeasuringContext()
1648 {
1649     return NULL;
1650     // TODO
1651 }
1652
1653 wxGraphicsContext * wxCairoRenderer::CreateContext( wxWindow* window )
1654 {
1655     return new wxCairoContext(this, window );
1656 }
1657
1658 // Path
1659
1660 wxGraphicsPath wxCairoRenderer::CreatePath()
1661 {
1662     wxGraphicsPath path;
1663     path.SetRefData( new wxCairoPathData(this) );
1664     return path;
1665 }
1666
1667
1668 // Matrix
1669
1670 wxGraphicsMatrix wxCairoRenderer::CreateMatrix( wxDouble a, wxDouble b, wxDouble c, wxDouble d,
1671                                                 wxDouble tx, wxDouble ty)
1672
1673 {
1674     wxGraphicsMatrix m;
1675     wxCairoMatrixData* data = new wxCairoMatrixData( this );
1676     data->Set( a,b,c,d,tx,ty ) ;
1677     m.SetRefData(data);
1678     return m;
1679 }
1680
1681 wxGraphicsPen wxCairoRenderer::CreatePen(const wxPen& pen)
1682 {
1683     if ( !pen.Ok() || pen.GetStyle() == wxTRANSPARENT )
1684         return wxNullGraphicsPen;
1685     else
1686     {
1687         wxGraphicsPen p;
1688         p.SetRefData(new wxCairoPenData( this, pen ));
1689         return p;
1690     }
1691 }
1692
1693 wxGraphicsBrush wxCairoRenderer::CreateBrush(const wxBrush& brush )
1694 {
1695     if ( !brush.Ok() || brush.GetStyle() == wxTRANSPARENT )
1696         return wxNullGraphicsBrush;
1697     else
1698     {
1699         wxGraphicsBrush p;
1700         p.SetRefData(new wxCairoBrushData( this, brush ));
1701         return p;
1702     }
1703 }
1704
1705 // sets the brush to a linear gradient, starting at (x1,y1) with color c1 to (x2,y2) with color c2
1706 wxGraphicsBrush wxCairoRenderer::CreateLinearGradientBrush( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
1707                                                                       const wxColour&c1, const wxColour&c2)
1708 {
1709     wxGraphicsBrush p;
1710     wxCairoBrushData* d = new wxCairoBrushData( this );
1711     d->CreateLinearGradientBrush(x1, y1, x2, y2, c1, c2);
1712     p.SetRefData(d);
1713     return p;
1714 }
1715
1716 // sets the brush to a radial gradient originating at (xo,yc) with color oColor and ends on a circle around (xc,yc)
1717 // with radius r and color cColor
1718 wxGraphicsBrush wxCairoRenderer::CreateRadialGradientBrush( wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius,
1719                                                                       const wxColour &oColor, const wxColour &cColor)
1720 {
1721     wxGraphicsBrush p;
1722     wxCairoBrushData* d = new wxCairoBrushData( this );
1723     d->CreateRadialGradientBrush(xo,yo,xc,yc,radius,oColor,cColor);
1724     p.SetRefData(d);
1725     return p;
1726 }
1727
1728 // sets the font
1729 wxGraphicsFont wxCairoRenderer::CreateFont( const wxFont &font , const wxColour &col )
1730 {
1731     if ( font.Ok() )
1732     {
1733         wxGraphicsFont p;
1734         p.SetRefData(new wxCairoFontData( this , font, col ));
1735         return p;
1736     }
1737     else
1738         return wxNullGraphicsFont;
1739 }
1740
1741 #endif  // wxUSE_GRAPHICS_CONTEXT