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[wxWidgets.git] / src / msw / dc.cpp
1 /////////////////////////////////////////////////////////////////////////////
2 // Name: dc.cpp
3 // Purpose: wxDC class
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 01/02/97
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart and Markus Holzem
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ===========================================================================
13 // declarations
14 // ===========================================================================
15
16 // ---------------------------------------------------------------------------
17 // headers
18 // ---------------------------------------------------------------------------
19
20 #ifdef __GNUG__
21 #pragma implementation "dc.h"
22 #endif
23
24 // For compilers that support precompilation, includes "wx.h".
25 #include "wx/wxprec.h"
26
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #ifndef WX_PRECOMP
32 #include "wx/window.h"
33 #include "wx/dc.h"
34 #include "wx/utils.h"
35 #include "wx/dialog.h"
36 #include "wx/app.h"
37 #include "wx/bitmap.h"
38 #include "wx/dcmemory.h"
39 #include "wx/log.h"
40 #include "wx/icon.h"
41 #endif
42
43 #include "wx/dcprint.h"
44
45 #include <string.h>
46 #include <math.h>
47
48 #include "wx/msw/private.h" // needs to be before #include <commdlg.h>
49
50 #if wxUSE_COMMON_DIALOGS
51 #if wxUSE_NORLANDER_HEADERS
52 #include <windows.h>
53 #endif
54 #include <commdlg.h>
55 #endif
56
57 #ifndef __WIN32__
58 #include <print.h>
59 #endif
60
61 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
62
63 // ---------------------------------------------------------------------------
64 // constants
65 // ---------------------------------------------------------------------------
66
67 static const int VIEWPORT_EXTENT = 1000;
68
69 static const int MM_POINTS = 9;
70 static const int MM_METRIC = 10;
71
72 // usually this is defined in math.h
73 #ifndef M_PI
74 static const double M_PI = 3.14159265358979323846;
75 #endif // M_PI
76
77 // ---------------------------------------------------------------------------
78 // private functions
79 // ---------------------------------------------------------------------------
80
81 // convert degrees to radians
82 static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
83
84 // ===========================================================================
85 // implementation
86 // ===========================================================================
87
88 // ---------------------------------------------------------------------------
89 // wxDC
90 // ---------------------------------------------------------------------------
91
92 // Default constructor
93 wxDC::wxDC()
94 {
95 m_canvas = NULL;
96
97 m_oldBitmap = 0;
98 m_oldPen = 0;
99 m_oldBrush = 0;
100 m_oldFont = 0;
101 m_oldPalette = 0;
102
103 m_bOwnsDC = FALSE;
104 m_hDC = 0;
105
106 m_windowExtX = VIEWPORT_EXTENT;
107 m_windowExtY = VIEWPORT_EXTENT;
108
109 m_hDCCount = 0;
110 }
111
112
113 wxDC::~wxDC()
114 {
115 if ( m_hDC != 0 ) {
116 SelectOldObjects(m_hDC);
117 if ( m_bOwnsDC ) {
118 if ( m_canvas == NULL )
119 ::DeleteDC(GetHdc());
120 else
121 ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
122 }
123 }
124
125 }
126
127 // This will select current objects out of the DC,
128 // which is what you have to do before deleting the
129 // DC.
130 void wxDC::SelectOldObjects(WXHDC dc)
131 {
132 if (dc)
133 {
134 if (m_oldBitmap)
135 {
136 ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
137 if (m_selectedBitmap.Ok())
138 {
139 m_selectedBitmap.SetSelectedInto(NULL);
140 }
141 }
142 m_oldBitmap = 0;
143 if (m_oldPen)
144 {
145 ::SelectObject((HDC) dc, (HPEN) m_oldPen);
146 }
147 m_oldPen = 0;
148 if (m_oldBrush)
149 {
150 ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
151 }
152 m_oldBrush = 0;
153 if (m_oldFont)
154 {
155 ::SelectObject((HDC) dc, (HFONT) m_oldFont);
156 }
157 m_oldFont = 0;
158 if (m_oldPalette)
159 {
160 ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
161 }
162 m_oldPalette = 0;
163 }
164
165 m_brush = wxNullBrush;
166 m_pen = wxNullPen;
167 m_palette = wxNullPalette;
168 m_font = wxNullFont;
169 m_backgroundBrush = wxNullBrush;
170 m_selectedBitmap = wxNullBitmap;
171 }
172
173 // ---------------------------------------------------------------------------
174 // clipping
175 // ---------------------------------------------------------------------------
176
177 void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
178 {
179 m_clipping = TRUE;
180 m_clipX1 = (int)cx;
181 m_clipY1 = (int)cy;
182 m_clipX2 = (int)(cx + cw);
183 m_clipY2 = (int)(cy + ch);
184
185 DoClipping((WXHDC) m_hDC);
186 }
187
188 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
189 {
190 wxCHECK_RET( region.GetHRGN(), wxT("invalid clipping region") );
191
192 wxRect box = region.GetBox();
193
194 m_clipping = TRUE;
195 m_clipX1 = box.x;
196 m_clipY1 = box.y;
197 m_clipX2 = box.x + box.width;
198 m_clipY2 = box.y + box.height;
199
200 #ifdef __WIN16__
201 SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
202 #else
203 ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
204 #endif
205 }
206
207 void wxDC::DoClipping(WXHDC dc)
208 {
209 if (m_clipping && dc)
210 {
211 IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
212 XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
213 }
214 }
215
216 void wxDC::DestroyClippingRegion()
217 {
218 if (m_clipping && m_hDC)
219 {
220 // TODO: this should restore the previous clipping region,
221 // so that OnPaint processing works correctly, and the update clipping region
222 // doesn't get destroyed after the first DestroyClippingRegion.
223 HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
224 SelectClipRgn(GetHdc(), rgn);
225 DeleteObject(rgn);
226 }
227 m_clipping = FALSE;
228 }
229
230 // ---------------------------------------------------------------------------
231 // query capabilities
232 // ---------------------------------------------------------------------------
233
234 bool wxDC::CanDrawBitmap() const
235 {
236 return TRUE;
237 }
238
239 bool wxDC::CanGetTextExtent() const
240 {
241 // What sort of display is it?
242 int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
243
244 return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
245 }
246
247 int wxDC::GetDepth() const
248 {
249 return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
250 }
251
252 // ---------------------------------------------------------------------------
253 // drawing
254 // ---------------------------------------------------------------------------
255
256 void wxDC::Clear()
257 {
258 RECT rect;
259 if ( m_canvas )
260 {
261 GetClientRect((HWND) m_canvas->GetHWND(), &rect);
262 }
263 else
264 {
265 // No, I think we should simply ignore this if printing on e.g.
266 // a printer DC.
267 // wxCHECK_RET( m_selectedBitmap.Ok(), wxT("this DC can't be cleared") );
268 if (!m_selectedBitmap.Ok())
269 return;
270
271 rect.left = 0; rect.top = 0;
272 rect.right = m_selectedBitmap.GetWidth();
273 rect.bottom = m_selectedBitmap.GetHeight();
274 }
275
276 (void) ::SetMapMode(GetHdc(), MM_TEXT);
277
278 DWORD colour = GetBkColor(GetHdc());
279 HBRUSH brush = CreateSolidBrush(colour);
280 FillRect(GetHdc(), &rect, brush);
281 DeleteObject(brush);
282
283 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
284 ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
285 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
286 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
287 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
288 }
289
290 void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
291 {
292 if ( !::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
293 col.GetPixel(),
294 style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
295 : FLOODFILLBORDER) )
296 {
297 // quoting from the MSDN docs:
298 //
299 // Following are some of the reasons this function might fail:
300 //
301 // * The filling could not be completed.
302 // * The specified point has the boundary color specified by the
303 // crColor parameter (if FLOODFILLBORDER was requested).
304 // * The specified point does not have the color specified by
305 // crColor (if FLOODFILLSURFACE was requested)
306 // * The point is outside the clipping region that is, it is not
307 // visible on the device.
308 //
309 wxLogLastError("ExtFloodFill");
310 }
311
312 CalcBoundingBox(x, y);
313 }
314
315 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
316 {
317 // get the color of the pixel
318 COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
319
320 // get the color of the pen
321 COLORREF pencolor = 0x00ffffff;
322 if (m_pen.Ok())
323 {
324 pencolor = m_pen.GetColour().GetPixel();
325 }
326
327 // return the color of the pixel
328 if( col )
329 {
330 col->Set(GetRValue(pixelcolor),
331 GetGValue(pixelcolor),
332 GetBValue(pixelcolor));
333 }
334
335 // check, if color of the pixels is the same as the color of the current
336 // pen and return TRUE if it is, FALSE otherwise
337 return pixelcolor == pencolor;
338 }
339
340 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
341 {
342 wxCoord x1 = x-VIEWPORT_EXTENT;
343 wxCoord y1 = y-VIEWPORT_EXTENT;
344 wxCoord x2 = x+VIEWPORT_EXTENT;
345 wxCoord y2 = y+VIEWPORT_EXTENT;
346
347 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
348 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
349
350 (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
351 (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
352
353 CalcBoundingBox(x1, y1);
354 CalcBoundingBox(x2, y2);
355 }
356
357 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
358 {
359 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
360 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
361
362 /* MATTHEW: [6] New normalization */
363 #if WX_STANDARD_GRAPHICS
364 (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
365 #endif
366
367 CalcBoundingBox(x1, y1);
368 CalcBoundingBox(x2, y2);
369 }
370
371 void wxDC::DoDrawArc(wxCoord x1,wxCoord y1,wxCoord x2,wxCoord y2, wxCoord xc, wxCoord yc)
372 {
373 double dx = xc-x1;
374 double dy = yc-y1;
375 double radius = (double)sqrt(dx*dx+dy*dy) ;;
376 if (x1==x2 && x2==y2)
377 {
378 DrawEllipse(xc,yc,(wxCoord)(radius*2.0),(wxCoord)(radius*2.0));
379 return;
380 }
381
382 wxCoord xx1 = XLOG2DEV(x1);
383 wxCoord yy1 = YLOG2DEV(y1);
384 wxCoord xx2 = XLOG2DEV(x2);
385 wxCoord yy2 = YLOG2DEV(y2);
386 wxCoord xxc = XLOG2DEV(xc);
387 wxCoord yyc = YLOG2DEV(yc);
388 wxCoord ray = (wxCoord) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
389
390 (void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
391 wxCoord xxx1 = (wxCoord) (xxc-ray);
392 wxCoord yyy1 = (wxCoord) (yyc-ray);
393 wxCoord xxx2 = (wxCoord) (xxc+ray);
394 wxCoord yyy2 = (wxCoord) (yyc+ray);
395 if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
396 {
397 // Have to add 1 to bottom-right corner of rectangle
398 // to make semi-circles look right (crooked line otherwise).
399 // Unfortunately this is not a reliable method, depends
400 // on the size of shape.
401 // TODO: figure out why this happens!
402 Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
403 xx1,yy1,xx2,yy2);
404 }
405 else
406 Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
407 xx1,yy1,xx2,yy2);
408
409 CalcBoundingBox((wxCoord)(xc-radius), (wxCoord)(yc-radius));
410 CalcBoundingBox((wxCoord)(xc+radius), (wxCoord)(yc+radius));
411 }
412
413 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
414 {
415 COLORREF color = 0x00ffffff;
416 if (m_pen.Ok())
417 {
418 color = m_pen.GetColour().GetPixel();
419 }
420
421 SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
422
423 CalcBoundingBox(x, y);
424 }
425
426 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
427 {
428 COLORREF old_textground = ::GetTextColor(GetHdc());
429 COLORREF old_background = ::GetBkColor(GetHdc());
430 if (m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE)
431 {
432
433 if (m_textForegroundColour.Ok())
434 { //just the oposite from what is expected see help on pattern brush
435 // 1 in mask becomes bk color
436 ::SetBkColor(GetHdc(), m_textForegroundColour.GetPixel() );
437 }
438 if (m_textBackgroundColour.Ok())
439 { //just the oposite from what is expected
440 // 0 in mask becomes text color
441 ::SetTextColor(GetHdc(), m_textBackgroundColour.GetPixel() );
442 }
443
444 if (m_backgroundMode == wxTRANSPARENT)
445 SetBkMode(GetHdc(), TRANSPARENT);
446 else
447 SetBkMode(GetHdc(), OPAQUE);
448 }
449
450 // Do things less efficiently if we have offsets
451 if (xoffset != 0 || yoffset != 0)
452 {
453 POINT *cpoints = new POINT[n];
454 int i;
455 for (i = 0; i < n; i++)
456 {
457 cpoints[i].x = (int)(points[i].x + xoffset);
458 cpoints[i].y = (int)(points[i].y + yoffset);
459
460 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
461 }
462 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
463 (void)Polygon(GetHdc(), cpoints, n);
464 SetPolyFillMode(GetHdc(),prev);
465 delete[] cpoints;
466 }
467 else
468 {
469 int i;
470 for (i = 0; i < n; i++)
471 CalcBoundingBox(points[i].x, points[i].y);
472
473 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
474 (void)Polygon(GetHdc(), (POINT*) points, n);
475 SetPolyFillMode(GetHdc(),prev);
476 }
477
478 if (m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE)
479 {
480 ::SetBkMode(GetHdc(), TRANSPARENT);
481 ::SetTextColor(GetHdc(), old_textground);
482 ::SetBkColor(GetHdc(), old_background);
483 }
484 }
485
486 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
487 {
488 // Do things less efficiently if we have offsets
489 if (xoffset != 0 || yoffset != 0)
490 {
491 POINT *cpoints = new POINT[n];
492 int i;
493 for (i = 0; i < n; i++)
494 {
495 cpoints[i].x = (int)(points[i].x + xoffset);
496 cpoints[i].y = (int)(points[i].y + yoffset);
497
498 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
499 }
500 (void)Polyline(GetHdc(), cpoints, n);
501 delete[] cpoints;
502 }
503 else
504 {
505 int i;
506 for (i = 0; i < n; i++)
507 CalcBoundingBox(points[i].x, points[i].y);
508
509 (void)Polyline(GetHdc(), (POINT*) points, n);
510 }
511 }
512
513 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
514 {
515 COLORREF colFgOld = 0,
516 colBgOld = 0;
517
518 if ( m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
519 {
520 colFgOld = ::GetTextColor(GetHdc());
521 colBgOld = ::GetBkColor(GetHdc());
522
523 if ( m_textForegroundColour.Ok() )
524 {
525 // just the oposite from what is expected see help on pattern brush
526 // 1 in mask becomes bk color
527 ::SetBkColor(GetHdc(), m_textForegroundColour.GetPixel());
528 }
529
530 if ( m_textBackgroundColour.Ok() )
531 {
532 // 0 in mask becomes text color
533 ::SetTextColor(GetHdc(), m_textBackgroundColour.GetPixel());
534 }
535
536 // VZ: IMHO this does strictly nothing here
537 SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
538 : OPAQUE);
539 }
540
541 wxCoord x2 = x + width;
542 wxCoord y2 = y + height;
543
544 // Windows draws the filled rectangles without outline (i.e. drawn with a
545 // transparent pen) one pixel smaller in both directions and we want them
546 // to have the same size regardless of which pen is used - adjust
547 if ( m_pen.GetStyle() == wxTRANSPARENT )
548 {
549 x2++;
550 y2++;
551 }
552
553 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
554
555 CalcBoundingBox(x, y);
556 CalcBoundingBox(x2, y2);
557
558 if ( m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
559 {
560 // restore the colours we changed
561 ::SetBkMode(GetHdc(), TRANSPARENT);
562 ::SetTextColor(GetHdc(), colFgOld);
563 ::SetBkColor(GetHdc(), colBgOld);
564 }
565 }
566
567 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
568 {
569 // Now, a negative radius value is interpreted to mean
570 // 'the proportion of the smallest X or Y dimension'
571
572 if (radius < 0.0)
573 {
574 double smallest = 0.0;
575 if (width < height)
576 smallest = width;
577 else
578 smallest = height;
579 radius = (- radius * smallest);
580 }
581
582 wxCoord x2 = (x+width);
583 wxCoord y2 = (y+height);
584
585 (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
586 YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
587
588 CalcBoundingBox(x, y);
589 CalcBoundingBox(x2, y2);
590 }
591
592 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
593 {
594 wxCoord x2 = (x+width);
595 wxCoord y2 = (y+height);
596
597 (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
598
599 CalcBoundingBox(x, y);
600 CalcBoundingBox(x2, y2);
601 }
602
603 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
604 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
605 {
606 wxCoord x2 = (x+w);
607 wxCoord y2 = (y+h);
608
609 int rx1 = XLOG2DEV(x+w/2);
610 int ry1 = YLOG2DEV(y+h/2);
611 int rx2 = rx1;
612 int ry2 = ry1;
613
614 sa = DegToRad(sa);
615 ea = DegToRad(ea);
616
617 rx1 += (int)(100.0 * abs(w) * cos(sa));
618 ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa));
619 rx2 += (int)(100.0 * abs(w) * cos(ea));
620 ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
621
622 // draw pie with NULL_PEN first and then outline otherwise a line is
623 // drawn from the start and end points to the centre
624 HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
625 if (m_signY > 0)
626 {
627 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
628 rx1, ry1, rx2, ry2);
629 }
630 else
631 {
632 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
633 rx1, ry1-1, rx2, ry2-1);
634 }
635 ::SelectObject(GetHdc(), orig_pen);
636 (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
637 rx1, ry1, rx2, ry2);
638
639 CalcBoundingBox(x, y);
640 CalcBoundingBox(x2, y2);
641 }
642
643 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
644 {
645 wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
646
647 ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), GetHiconOf(icon));
648
649 CalcBoundingBox(x, y);
650 CalcBoundingBox(x + icon.GetWidth(), y + icon.GetHeight());
651 }
652
653 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
654 {
655 wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
656
657 int width = bmp.GetWidth(),
658 height = bmp.GetHeight();
659
660 if ( !useMask )
661 {
662 HDC cdc = GetHdc();
663 HDC memdc = ::CreateCompatibleDC( cdc );
664 HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
665
666 wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
667
668 COLORREF old_textground = ::GetTextColor(GetHdc());
669 COLORREF old_background = ::GetBkColor(GetHdc());
670 if (m_textForegroundColour.Ok())
671 {
672 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
673 }
674 if (m_textBackgroundColour.Ok())
675 {
676 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
677 }
678
679 ::SelectObject( memdc, hbitmap );
680 ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
681 ::DeleteDC( memdc );
682
683 ::SetTextColor(GetHdc(), old_textground);
684 ::SetBkColor(GetHdc(), old_background);
685 }
686 else
687 {
688 // Rather than reproduce wxDC::Blit, let's do it at the wxWin API level
689 wxMemoryDC memDC;
690 memDC.SelectObject(bmp);
691
692 Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
693
694 memDC.SelectObject(wxNullBitmap);
695 }
696 }
697
698 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
699 {
700 DrawAnyText(text, x, y);
701
702 // update the bounding box
703 CalcBoundingBox(x, y);
704
705 wxCoord w, h;
706 GetTextExtent(text, &w, &h);
707 CalcBoundingBox(x + w, y + h);
708 }
709
710 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
711 {
712 // prepare for drawing the text
713 if ( m_textForegroundColour.Ok() )
714 SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
715
716 DWORD old_background = 0;
717 if ( m_textBackgroundColour.Ok() )
718 {
719 old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
720 }
721
722 SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
723 : OPAQUE);
724
725 if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
726 text.c_str(), text.length()) == 0 )
727 {
728 wxLogLastError("TextOut");
729 }
730
731 // restore the old parameters (text foreground colour may be left because
732 // it never is set to anything else, but background should remain
733 // transparent even if we just drew an opaque string)
734 if ( m_textBackgroundColour.Ok() )
735 (void)SetBkColor(GetHdc(), old_background);
736
737 SetBkMode(GetHdc(), TRANSPARENT);
738 }
739
740 void wxDC::DoDrawRotatedText(const wxString& text,
741 wxCoord x, wxCoord y,
742 double angle)
743 {
744 // we test that we have some font because otherwise we should still use the
745 // "else" part below to avoid that DrawRotatedText(angle = 180) and
746 // DrawRotatedText(angle = 0) use different fonts (we can't use the default
747 // font for drawing rotated fonts unfortunately)
748 if ( (angle == 0.0) && m_font.Ok() )
749 {
750 DoDrawText(text, x, y);
751 }
752 else
753 {
754 // NB: don't take DEFAULT_GUI_FONT because it's not TrueType and so
755 // can't have non zero orientation/escapement
756 wxFont font = m_font.Ok() ? m_font : *wxNORMAL_FONT;
757 HFONT hfont = (HFONT)font.GetResourceHandle();
758 LOGFONT lf;
759 if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
760 {
761 wxLogLastError("GetObject(hfont)");
762 }
763
764 // GDI wants the angle in tenth of degree
765 long angle10 = (long)(angle * 10);
766 lf.lfEscapement = angle10;
767 lf. lfOrientation = angle10;
768
769 hfont = ::CreateFontIndirect(&lf);
770 if ( !hfont )
771 {
772 wxLogLastError("CreateFont");
773 }
774 else
775 {
776 HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
777
778 DrawAnyText(text, x, y);
779
780 (void)::SelectObject(GetHdc(), hfontOld);
781 }
782
783 // call the bounding box by adding all four vertices of the rectangle
784 // containing the text to it (simpler and probably not slower than
785 // determining which of them is really topmost/leftmost/...)
786 wxCoord w, h;
787 GetTextExtent(text, &w, &h);
788
789 double rad = DegToRad(angle);
790
791 // "upper left" and "upper right"
792 CalcBoundingBox(x, y);
793 CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
794
795 // "bottom left" and "bottom right"
796 x += (wxCoord)(h*sin(rad));
797 y += (wxCoord)(h*cos(rad));
798 CalcBoundingBox(x, y);
799 CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
800 }
801 }
802
803 // ---------------------------------------------------------------------------
804 // set GDI objects
805 // ---------------------------------------------------------------------------
806
807 void wxDC::SetPalette(const wxPalette& palette)
808 {
809 // Set the old object temporarily, in case the assignment deletes an object
810 // that's not yet selected out.
811 if (m_oldPalette)
812 {
813 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
814 m_oldPalette = 0;
815 }
816
817 m_palette = palette;
818
819 if (!m_palette.Ok())
820 {
821 // Setting a NULL colourmap is a way of restoring
822 // the original colourmap
823 if (m_oldPalette)
824 {
825 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
826 m_oldPalette = 0;
827 }
828
829 return;
830 }
831
832 if (m_palette.Ok() && m_palette.GetHPALETTE())
833 {
834 HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
835 if (!m_oldPalette)
836 m_oldPalette = (WXHPALETTE) oldPal;
837
838 ::RealizePalette(GetHdc());
839 }
840 }
841
842 void wxDC::SetFont(const wxFont& the_font)
843 {
844 // Set the old object temporarily, in case the assignment deletes an object
845 // that's not yet selected out.
846 if (m_oldFont)
847 {
848 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
849 m_oldFont = 0;
850 }
851
852 m_font = the_font;
853
854 if (!the_font.Ok())
855 {
856 if (m_oldFont)
857 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
858 m_oldFont = 0;
859 }
860
861 if (m_font.Ok() && m_font.GetResourceHandle())
862 {
863 HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
864 if (f == (HFONT) NULL)
865 {
866 wxLogDebug(wxT("::SelectObject failed in wxDC::SetFont."));
867 }
868 if (!m_oldFont)
869 m_oldFont = (WXHFONT) f;
870 }
871 }
872
873 void wxDC::SetPen(const wxPen& pen)
874 {
875 // Set the old object temporarily, in case the assignment deletes an object
876 // that's not yet selected out.
877 if (m_oldPen)
878 {
879 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
880 m_oldPen = 0;
881 }
882
883 m_pen = pen;
884
885 if (!m_pen.Ok())
886 {
887 if (m_oldPen)
888 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
889 m_oldPen = 0;
890 }
891
892 if (m_pen.Ok())
893 {
894 if (m_pen.GetResourceHandle())
895 {
896 HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
897 if (!m_oldPen)
898 m_oldPen = (WXHPEN) p;
899 }
900 }
901 }
902
903 void wxDC::SetBrush(const wxBrush& brush)
904 {
905 // Set the old object temporarily, in case the assignment deletes an object
906 // that's not yet selected out.
907 if (m_oldBrush)
908 {
909 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
910 m_oldBrush = 0;
911 }
912
913 m_brush = brush;
914
915 if (!m_brush.Ok())
916 {
917 if (m_oldBrush)
918 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
919 m_oldBrush = 0;
920 }
921
922 if (m_brush.Ok())
923 {
924 if (m_brush.GetResourceHandle())
925 {
926 HBRUSH b = 0;
927 b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
928 if (!m_oldBrush)
929 m_oldBrush = (WXHBRUSH) b;
930 }
931 }
932 }
933
934 void wxDC::SetBackground(const wxBrush& brush)
935 {
936 m_backgroundBrush = brush;
937
938 if (!m_backgroundBrush.Ok())
939 return;
940
941 if (m_canvas)
942 {
943 bool customColours = TRUE;
944 // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
945 // change background colours from the control-panel specified colours.
946 if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
947 customColours = FALSE;
948
949 if (customColours)
950 {
951 if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
952 {
953 m_canvas->SetTransparent(TRUE);
954 }
955 else
956 {
957 // New behaviour, 10/2/99: setting the background brush of a DC
958 // doesn't affect the window background colour. However,
959 // I'm leaving in the transparency setting because it's needed by
960 // various controls (e.g. wxStaticText) to determine whether to draw
961 // transparently or not. TODO: maybe this should be a new function
962 // wxWindow::SetTransparency(). Should that apply to the child itself, or the
963 // parent?
964 // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
965 m_canvas->SetTransparent(FALSE);
966 }
967 }
968 }
969 COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
970 {
971 (void)SetBkColor(GetHdc(), new_color);
972 }
973 }
974
975 void wxDC::SetBackgroundMode(int mode)
976 {
977 m_backgroundMode = mode;
978
979 // SetBackgroundColour now only refers to text background
980 // and m_backgroundMode is used there
981
982 /*
983 if (m_backgroundMode == wxTRANSPARENT)
984 ::SetBkMode(GetHdc(), TRANSPARENT);
985 else
986 ::SetBkMode(GetHdc(), OPAQUE);
987 */
988 }
989
990 void wxDC::SetLogicalFunction(int function)
991 {
992 m_logicalFunction = function;
993
994 SetRop((WXHDC) m_hDC);
995 }
996
997 void wxDC::SetRop(WXHDC dc)
998 {
999 if (!dc || m_logicalFunction < 0)
1000 return;
1001
1002 int c_rop;
1003 // These may be wrong
1004 switch (m_logicalFunction)
1005 {
1006 // case wxXOR: c_rop = R2_XORPEN; break;
1007 case wxXOR: c_rop = R2_NOTXORPEN; break;
1008 case wxINVERT: c_rop = R2_NOT; break;
1009 case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
1010 case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
1011 case wxCLEAR: c_rop = R2_WHITE; break;
1012 case wxSET: c_rop = R2_BLACK; break;
1013 case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
1014 case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
1015 case wxAND: c_rop = R2_MASKPEN; break;
1016 case wxOR: c_rop = R2_MERGEPEN; break;
1017 case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
1018 case wxEQUIV:
1019 case wxNAND:
1020 case wxCOPY:
1021 default:
1022 c_rop = R2_COPYPEN; break;
1023 }
1024 SetROP2((HDC) dc, c_rop);
1025 }
1026
1027 bool wxDC::StartDoc(const wxString& message)
1028 {
1029 // We might be previewing, so return TRUE to let it continue.
1030 return TRUE;
1031 }
1032
1033 void wxDC::EndDoc()
1034 {
1035 }
1036
1037 void wxDC::StartPage()
1038 {
1039 }
1040
1041 void wxDC::EndPage()
1042 {
1043 }
1044
1045 // ---------------------------------------------------------------------------
1046 // text metrics
1047 // ---------------------------------------------------------------------------
1048
1049 wxCoord wxDC::GetCharHeight() const
1050 {
1051 TEXTMETRIC lpTextMetric;
1052
1053 GetTextMetrics(GetHdc(), &lpTextMetric);
1054
1055 return YDEV2LOGREL(lpTextMetric.tmHeight);
1056 }
1057
1058 wxCoord wxDC::GetCharWidth() const
1059 {
1060 TEXTMETRIC lpTextMetric;
1061
1062 GetTextMetrics(GetHdc(), &lpTextMetric);
1063
1064 return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
1065 }
1066
1067 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
1068 wxCoord *descent, wxCoord *externalLeading,
1069 wxFont *theFont) const
1070 {
1071 wxFont *fontToUse = (wxFont*) theFont;
1072 if (!fontToUse)
1073 fontToUse = (wxFont*) &m_font;
1074
1075 SIZE sizeRect;
1076 TEXTMETRIC tm;
1077
1078 GetTextExtentPoint(GetHdc(), WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
1079 GetTextMetrics(GetHdc(), &tm);
1080
1081 if (x) *x = XDEV2LOGREL(sizeRect.cx);
1082 if (y) *y = YDEV2LOGREL(sizeRect.cy);
1083 if (descent) *descent = tm.tmDescent;
1084 if (externalLeading) *externalLeading = tm.tmExternalLeading;
1085 }
1086
1087 void wxDC::SetMapMode(int mode)
1088 {
1089 m_mappingMode = mode;
1090
1091 int pixel_width = 0;
1092 int pixel_height = 0;
1093 int mm_width = 0;
1094 int mm_height = 0;
1095
1096 pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
1097 pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
1098 mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
1099 mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
1100
1101 if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
1102 {
1103 return;
1104 }
1105
1106 double mm2pixelsX = pixel_width/mm_width;
1107 double mm2pixelsY = pixel_height/mm_height;
1108
1109 switch (mode)
1110 {
1111 case wxMM_TWIPS:
1112 {
1113 m_logicalScaleX = (twips2mm * mm2pixelsX);
1114 m_logicalScaleY = (twips2mm * mm2pixelsY);
1115 break;
1116 }
1117 case wxMM_POINTS:
1118 {
1119 m_logicalScaleX = (pt2mm * mm2pixelsX);
1120 m_logicalScaleY = (pt2mm * mm2pixelsY);
1121 break;
1122 }
1123 case wxMM_METRIC:
1124 {
1125 m_logicalScaleX = mm2pixelsX;
1126 m_logicalScaleY = mm2pixelsY;
1127 break;
1128 }
1129 case wxMM_LOMETRIC:
1130 {
1131 m_logicalScaleX = (mm2pixelsX/10.0);
1132 m_logicalScaleY = (mm2pixelsY/10.0);
1133 break;
1134 }
1135 default:
1136 case wxMM_TEXT:
1137 {
1138 m_logicalScaleX = 1.0;
1139 m_logicalScaleY = 1.0;
1140 break;
1141 }
1142 }
1143
1144 if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
1145 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1146
1147 SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1148 m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
1149 m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
1150 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
1151 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1152 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1153 }
1154
1155 void wxDC::SetUserScale(double x, double y)
1156 {
1157 m_userScaleX = x;
1158 m_userScaleY = y;
1159
1160 SetMapMode(m_mappingMode);
1161 }
1162
1163 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1164 {
1165 m_signX = xLeftRight ? 1 : -1;
1166 m_signY = yBottomUp ? -1 : 1;
1167
1168 SetMapMode(m_mappingMode);
1169 }
1170
1171 void wxDC::SetSystemScale(double x, double y)
1172 {
1173 m_scaleX = x;
1174 m_scaleY = y;
1175
1176 SetMapMode(m_mappingMode);
1177 }
1178
1179 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
1180 {
1181 m_logicalOriginX = x;
1182 m_logicalOriginY = y;
1183
1184 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1185 }
1186
1187 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
1188 {
1189 m_deviceOriginX = x;
1190 m_deviceOriginY = y;
1191
1192 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1193 }
1194
1195 // ---------------------------------------------------------------------------
1196 // coordinates transformations
1197 // ---------------------------------------------------------------------------
1198
1199 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
1200 {
1201 return (wxCoord) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1202 }
1203
1204 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
1205 {
1206 return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1207 }
1208
1209 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
1210 {
1211 return (wxCoord) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1212 }
1213
1214 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
1215 {
1216 return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1217 }
1218
1219 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
1220 {
1221 return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1222 }
1223
1224 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
1225 {
1226 return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1227 }
1228
1229 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
1230 {
1231 return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1232 }
1233
1234 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
1235 {
1236 return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1237 }
1238
1239 // ---------------------------------------------------------------------------
1240 // bit blit
1241 // ---------------------------------------------------------------------------
1242
1243 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
1244 wxCoord width, wxCoord height,
1245 wxDC *source, wxCoord xsrc, wxCoord ysrc,
1246 int rop, bool useMask)
1247 {
1248 wxMask *mask = NULL;
1249 if ( useMask )
1250 {
1251 const wxBitmap& bmp = source->m_selectedBitmap;
1252 mask = bmp.GetMask();
1253
1254 if ( !(bmp.Ok() && mask && mask->GetMaskBitmap()) )
1255 {
1256 // don't give assert here because this would break existing
1257 // programs - just silently ignore useMask parameter
1258 useMask = FALSE;
1259 }
1260 }
1261
1262 COLORREF old_textground = ::GetTextColor(GetHdc());
1263 COLORREF old_background = ::GetBkColor(GetHdc());
1264 if (m_textForegroundColour.Ok())
1265 {
1266 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1267 }
1268 if (m_textBackgroundColour.Ok())
1269 {
1270 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1271 }
1272
1273 DWORD dwRop = rop == wxCOPY ? SRCCOPY :
1274 rop == wxCLEAR ? WHITENESS :
1275 rop == wxSET ? BLACKNESS :
1276 rop == wxINVERT ? DSTINVERT :
1277 rop == wxAND ? MERGECOPY :
1278 rop == wxOR ? MERGEPAINT :
1279 rop == wxSRC_INVERT ? NOTSRCCOPY :
1280 rop == wxXOR ? SRCINVERT :
1281 rop == wxOR_REVERSE ? MERGEPAINT :
1282 rop == wxAND_REVERSE ? SRCERASE :
1283 rop == wxSRC_OR ? SRCPAINT :
1284 rop == wxSRC_AND ? SRCAND :
1285 SRCCOPY;
1286
1287 bool success;
1288
1289 if (useMask)
1290 {
1291 #ifdef __WIN32__
1292 HBITMAP hbmpMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
1293
1294 // we want the part of the image corresponding to the mask to be
1295 // transparent, i.e. do PATCOPY there and apply dwRop elsewhere
1296 const wxColour& colBg = m_backgroundBrush.GetColour();
1297 HBRUSH hbrBg = (HBRUSH)::CreateSolidBrush(wxColourToRGB(colBg));
1298 HBRUSH hbrOld = (HBRUSH)::SelectObject(GetHdc(), hbrBg);
1299
1300 success = ::MaskBlt(GetHdc(), xdest, ydest, width, height,
1301 GetHdcOf(*source), xsrc, ysrc,
1302 hbmpMask, 0, 0,
1303 MAKEROP4(PATCOPY, dwRop)) != 0;
1304
1305 (void)::SelectObject(GetHdc(), hbrOld);
1306 ::DeleteObject(hbrOld);
1307 ::DeleteObject(hbmpMask);
1308
1309 if ( !success )
1310 #endif // Win32
1311 {
1312 // Blit bitmap with mask
1313
1314 // create a temp buffer bitmap and DCs to access it and the mask
1315 HDC dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
1316 HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
1317 HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
1318 ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
1319 ::SelectObject(dc_buffer, buffer_bmap);
1320
1321 // copy dest to buffer
1322 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1323 GetHdc(), xdest, ydest, SRCCOPY) )
1324 {
1325 wxLogLastError("BitBlt");
1326 }
1327
1328 // copy src to buffer using selected raster op
1329 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1330 GetHdcOf(*source), xsrc, ysrc, dwRop) )
1331 {
1332 wxLogLastError("BitBlt");
1333 }
1334
1335 // set masked area in buffer to BLACK (pixel value 0)
1336 COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
1337 COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
1338 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1339 dc_mask, xsrc, ysrc, SRCAND) )
1340 {
1341 wxLogLastError("BitBlt");
1342 }
1343
1344 // set unmasked area in dest to BLACK
1345 ::SetBkColor(GetHdc(), RGB(0, 0, 0));
1346 ::SetTextColor(GetHdc(), RGB(255, 255, 255));
1347 if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,
1348 dc_mask, xsrc, ysrc, SRCAND) )
1349 {
1350 wxLogLastError("BitBlt");
1351 }
1352 ::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
1353 ::SetTextColor(GetHdc(), prevCol);
1354
1355 // OR buffer to dest
1356 success = ::BitBlt(GetHdc(), xdest, ydest,
1357 (int)width, (int)height,
1358 dc_buffer, 0, 0, SRCPAINT) != 0;
1359 if ( !success )
1360 {
1361 wxLogLastError("BitBlt");
1362 }
1363
1364 // tidy up temporary DCs and bitmap
1365 ::SelectObject(dc_mask, 0);
1366 ::DeleteDC(dc_mask);
1367 ::SelectObject(dc_buffer, 0);
1368 ::DeleteDC(dc_buffer);
1369 ::DeleteObject(buffer_bmap);
1370 }
1371 }
1372 else // no mask, just BitBlt() it
1373 {
1374 success = ::BitBlt(GetHdc(), xdest, ydest,
1375 (int)width, (int)height,
1376 GetHdcOf(*source), xsrc, ysrc, dwRop) != 0;
1377 if ( !success )
1378 {
1379 wxLogLastError("BitBlt");
1380 }
1381 }
1382
1383 ::SetTextColor(GetHdc(), old_textground);
1384 ::SetBkColor(GetHdc(), old_background);
1385
1386 return success;
1387 }
1388
1389 void wxDC::DoGetSize(int *w, int *h) const
1390 {
1391 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
1392 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
1393 }
1394
1395 void wxDC::DoGetSizeMM(int *w, int *h) const
1396 {
1397 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
1398 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1399 }
1400
1401 wxSize wxDC::GetPPI() const
1402 {
1403 int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
1404 int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
1405
1406 return wxSize(x, y);
1407 }
1408
1409 // For use by wxWindows only, unless custom units are required.
1410 void wxDC::SetLogicalScale(double x, double y)
1411 {
1412 m_logicalScaleX = x;
1413 m_logicalScaleY = y;
1414 }
1415
1416 #if WXWIN_COMPATIBILITY
1417 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1418 float *descent, float *externalLeading,
1419 wxFont *theFont, bool use16bit) const
1420 {
1421 wxCoord x1, y1, descent1, externalLeading1;
1422 GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1423 *x = x1; *y = y1;
1424 if (descent)
1425 *descent = descent1;
1426 if (externalLeading)
1427 *externalLeading = externalLeading1;
1428 }
1429 #endif
1430
1431 // ---------------------------------------------------------------------------
1432 // spline drawing code
1433 // ---------------------------------------------------------------------------
1434
1435 #if wxUSE_SPLINES
1436
1437 class wxSpline: public wxObject
1438 {
1439 public:
1440 int type;
1441 wxList *points;
1442
1443 wxSpline(wxList *list);
1444 void DeletePoints();
1445
1446 // Doesn't delete points
1447 ~wxSpline();
1448 };
1449
1450 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1451
1452 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1453 double a3, double b3, double a4, double b4);
1454 void wx_clear_stack();
1455 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1456 double *y3, double *x4, double *y4);
1457 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1458 double x4, double y4);
1459 static bool wx_spline_add_point(double x, double y);
1460 static void wx_spline_draw_point_array(wxDC *dc);
1461 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1462
1463 void wxDC::DoDrawSpline(wxList *list)
1464 {
1465 wxSpline spline(list);
1466
1467 wx_draw_open_spline(this, &spline);
1468 }
1469
1470 wxList wx_spline_point_list;
1471
1472 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1473 {
1474 wxPoint *p;
1475 double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1476 double x1, y1, x2, y2;
1477
1478 wxNode *node = spline->points->First();
1479 p = (wxPoint *)node->Data();
1480
1481 x1 = p->x;
1482 y1 = p->y;
1483
1484 node = node->Next();
1485 p = (wxPoint *)node->Data();
1486
1487 x2 = p->x;
1488 y2 = p->y;
1489 cx1 = (double)((x1 + x2) / 2);
1490 cy1 = (double)((y1 + y2) / 2);
1491 cx2 = (double)((cx1 + x2) / 2);
1492 cy2 = (double)((cy1 + y2) / 2);
1493
1494 wx_spline_add_point(x1, y1);
1495
1496 while ((node = node->Next()) != NULL)
1497 {
1498 p = (wxPoint *)node->Data();
1499 x1 = x2;
1500 y1 = y2;
1501 x2 = p->x;
1502 y2 = p->y;
1503 cx4 = (double)(x1 + x2) / 2;
1504 cy4 = (double)(y1 + y2) / 2;
1505 cx3 = (double)(x1 + cx4) / 2;
1506 cy3 = (double)(y1 + cy4) / 2;
1507
1508 wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1509
1510 cx1 = cx4;
1511 cy1 = cy4;
1512 cx2 = (double)(cx1 + x2) / 2;
1513 cy2 = (double)(cy1 + y2) / 2;
1514 }
1515
1516 wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1517 wx_spline_add_point(x2, y2);
1518
1519 wx_spline_draw_point_array(dc);
1520
1521 }
1522
1523 /********************* CURVES FOR SPLINES *****************************
1524
1525 The following spline drawing routine is from
1526
1527 "An Algorithm for High-Speed Curve Generation"
1528 by George Merrill Chaikin,
1529 Computer Graphics and Image Processing, 3, Academic Press,
1530 1974, 346-349.
1531
1532 and
1533
1534 "On Chaikin's Algorithm" by R. F. Riesenfeld,
1535 Computer Graphics and Image Processing, 4, Academic Press,
1536 1975, 304-310.
1537
1538 ***********************************************************************/
1539
1540 #define half(z1, z2) ((z1+z2)/2.0)
1541 #define THRESHOLD 5
1542
1543 /* iterative version */
1544
1545 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1546 double b4)
1547 {
1548 register double xmid, ymid;
1549 double x1, y1, x2, y2, x3, y3, x4, y4;
1550
1551 wx_clear_stack();
1552 wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1553
1554 while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1555 xmid = (double)half(x2, x3);
1556 ymid = (double)half(y2, y3);
1557 if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1558 fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1559 wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1560 wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1561 } else {
1562 wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1563 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1564 wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1565 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1566 }
1567 }
1568 }
1569
1570
1571 /* utilities used by spline drawing routines */
1572
1573
1574 typedef struct wx_spline_stack_struct {
1575 double x1, y1, x2, y2, x3, y3, x4, y4;
1576 }
1577 Stack;
1578
1579 #define SPLINE_STACK_DEPTH 20
1580 static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
1581 static Stack *wx_stack_top;
1582 static int wx_stack_count;
1583
1584 void wx_clear_stack()
1585 {
1586 wx_stack_top = wx_spline_stack;
1587 wx_stack_count = 0;
1588 }
1589
1590 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1591 {
1592 wx_stack_top->x1 = x1;
1593 wx_stack_top->y1 = y1;
1594 wx_stack_top->x2 = x2;
1595 wx_stack_top->y2 = y2;
1596 wx_stack_top->x3 = x3;
1597 wx_stack_top->y3 = y3;
1598 wx_stack_top->x4 = x4;
1599 wx_stack_top->y4 = y4;
1600 wx_stack_top++;
1601 wx_stack_count++;
1602 }
1603
1604 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1605 double *x3, double *y3, double *x4, double *y4)
1606 {
1607 if (wx_stack_count == 0)
1608 return (0);
1609 wx_stack_top--;
1610 wx_stack_count--;
1611 *x1 = wx_stack_top->x1;
1612 *y1 = wx_stack_top->y1;
1613 *x2 = wx_stack_top->x2;
1614 *y2 = wx_stack_top->y2;
1615 *x3 = wx_stack_top->x3;
1616 *y3 = wx_stack_top->y3;
1617 *x4 = wx_stack_top->x4;
1618 *y4 = wx_stack_top->y4;
1619 return (1);
1620 }
1621
1622 static bool wx_spline_add_point(double x, double y)
1623 {
1624 wxPoint *point = new wxPoint;
1625 point->x = (int) x;
1626 point->y = (int) y;
1627 wx_spline_point_list.Append((wxObject*)point);
1628 return TRUE;
1629 }
1630
1631 static void wx_spline_draw_point_array(wxDC *dc)
1632 {
1633 dc->DrawLines(&wx_spline_point_list, 0, 0);
1634 wxNode *node = wx_spline_point_list.First();
1635 while (node)
1636 {
1637 wxPoint *point = (wxPoint *)node->Data();
1638 delete point;
1639 delete node;
1640 node = wx_spline_point_list.First();
1641 }
1642 }
1643
1644 wxSpline::wxSpline(wxList *list)
1645 {
1646 points = list;
1647 }
1648
1649 wxSpline::~wxSpline()
1650 {
1651 }
1652
1653 void wxSpline::DeletePoints()
1654 {
1655 for(wxNode *node = points->First(); node; node = points->First())
1656 {
1657 wxPoint *point = (wxPoint *)node->Data();
1658 delete point;
1659 delete node;
1660 }
1661 delete points;
1662 }
1663
1664
1665 #endif // wxUSE_SPLINES
1666
wxWidgets (Impactor)