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fixed bug in scaling images
[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 // ROPs which don't have standard names (see "Ternary Raster Operations" in the
78 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
79 #define DSTCOPY 0x00AA0029 // a.k.a. NOP operation
80
81 // ---------------------------------------------------------------------------
82 // private functions
83 // ---------------------------------------------------------------------------
84
85 // convert degrees to radians
86 static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
87
88 // ===========================================================================
89 // implementation
90 // ===========================================================================
91
92 // ---------------------------------------------------------------------------
93 // wxDC
94 // ---------------------------------------------------------------------------
95
96 // Default constructor
97 wxDC::wxDC()
98 {
99 m_canvas = NULL;
100
101 m_oldBitmap = 0;
102 m_oldPen = 0;
103 m_oldBrush = 0;
104 m_oldFont = 0;
105 m_oldPalette = 0;
106
107 m_bOwnsDC = FALSE;
108 m_hDC = 0;
109
110 m_windowExtX = VIEWPORT_EXTENT;
111 m_windowExtY = VIEWPORT_EXTENT;
112
113 m_hDCCount = 0;
114 }
115
116
117 wxDC::~wxDC()
118 {
119 if ( m_hDC != 0 ) {
120 SelectOldObjects(m_hDC);
121 if ( m_bOwnsDC ) {
122 if ( m_canvas == NULL )
123 ::DeleteDC(GetHdc());
124 else
125 ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
126 }
127 }
128
129 }
130
131 // This will select current objects out of the DC,
132 // which is what you have to do before deleting the
133 // DC.
134 void wxDC::SelectOldObjects(WXHDC dc)
135 {
136 if (dc)
137 {
138 if (m_oldBitmap)
139 {
140 ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
141 if (m_selectedBitmap.Ok())
142 {
143 m_selectedBitmap.SetSelectedInto(NULL);
144 }
145 }
146 m_oldBitmap = 0;
147 if (m_oldPen)
148 {
149 ::SelectObject((HDC) dc, (HPEN) m_oldPen);
150 }
151 m_oldPen = 0;
152 if (m_oldBrush)
153 {
154 ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
155 }
156 m_oldBrush = 0;
157 if (m_oldFont)
158 {
159 ::SelectObject((HDC) dc, (HFONT) m_oldFont);
160 }
161 m_oldFont = 0;
162 if (m_oldPalette)
163 {
164 ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
165 }
166 m_oldPalette = 0;
167 }
168
169 m_brush = wxNullBrush;
170 m_pen = wxNullPen;
171 m_palette = wxNullPalette;
172 m_font = wxNullFont;
173 m_backgroundBrush = wxNullBrush;
174 m_selectedBitmap = wxNullBitmap;
175 }
176
177 // ---------------------------------------------------------------------------
178 // clipping
179 // ---------------------------------------------------------------------------
180
181 void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
182 {
183 m_clipping = TRUE;
184 m_clipX1 = (int)cx;
185 m_clipY1 = (int)cy;
186 m_clipX2 = (int)(cx + cw);
187 m_clipY2 = (int)(cy + ch);
188
189 DoClipping((WXHDC) m_hDC);
190 }
191
192 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
193 {
194 wxCHECK_RET( region.GetHRGN(), wxT("invalid clipping region") );
195
196 wxRect box = region.GetBox();
197
198 m_clipping = TRUE;
199 m_clipX1 = box.x;
200 m_clipY1 = box.y;
201 m_clipX2 = box.x + box.width;
202 m_clipY2 = box.y + box.height;
203
204 #ifdef __WIN16__
205 SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
206 #else
207 ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
208 #endif
209 }
210
211 void wxDC::DoClipping(WXHDC dc)
212 {
213 if (m_clipping && dc)
214 {
215 IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
216 XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
217 }
218 }
219
220 void wxDC::DestroyClippingRegion()
221 {
222 if (m_clipping && m_hDC)
223 {
224 // TODO: this should restore the previous clipping region,
225 // so that OnPaint processing works correctly, and the update clipping region
226 // doesn't get destroyed after the first DestroyClippingRegion.
227 HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
228 SelectClipRgn(GetHdc(), rgn);
229 DeleteObject(rgn);
230 }
231 m_clipping = FALSE;
232 }
233
234 // ---------------------------------------------------------------------------
235 // query capabilities
236 // ---------------------------------------------------------------------------
237
238 bool wxDC::CanDrawBitmap() const
239 {
240 return TRUE;
241 }
242
243 bool wxDC::CanGetTextExtent() const
244 {
245 // What sort of display is it?
246 int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
247
248 return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
249 }
250
251 int wxDC::GetDepth() const
252 {
253 return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
254 }
255
256 // ---------------------------------------------------------------------------
257 // drawing
258 // ---------------------------------------------------------------------------
259
260 void wxDC::Clear()
261 {
262 RECT rect;
263 if ( m_canvas )
264 {
265 GetClientRect((HWND) m_canvas->GetHWND(), &rect);
266 }
267 else
268 {
269 // No, I think we should simply ignore this if printing on e.g.
270 // a printer DC.
271 // wxCHECK_RET( m_selectedBitmap.Ok(), wxT("this DC can't be cleared") );
272 if (!m_selectedBitmap.Ok())
273 return;
274
275 rect.left = 0; rect.top = 0;
276 rect.right = m_selectedBitmap.GetWidth();
277 rect.bottom = m_selectedBitmap.GetHeight();
278 }
279
280 (void) ::SetMapMode(GetHdc(), MM_TEXT);
281
282 DWORD colour = GetBkColor(GetHdc());
283 HBRUSH brush = CreateSolidBrush(colour);
284 FillRect(GetHdc(), &rect, brush);
285 DeleteObject(brush);
286
287 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
288 ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
289 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
290 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
291 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
292 }
293
294 void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
295 {
296 if ( !::ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
297 col.GetPixel(),
298 style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
299 : FLOODFILLBORDER) )
300 {
301 // quoting from the MSDN docs:
302 //
303 // Following are some of the reasons this function might fail:
304 //
305 // * The filling could not be completed.
306 // * The specified point has the boundary color specified by the
307 // crColor parameter (if FLOODFILLBORDER was requested).
308 // * The specified point does not have the color specified by
309 // crColor (if FLOODFILLSURFACE was requested)
310 // * The point is outside the clipping region that is, it is not
311 // visible on the device.
312 //
313 wxLogLastError("ExtFloodFill");
314 }
315
316 CalcBoundingBox(x, y);
317 }
318
319 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
320 {
321 // get the color of the pixel
322 COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
323
324 // get the color of the pen
325 COLORREF pencolor = 0x00ffffff;
326 if (m_pen.Ok())
327 {
328 pencolor = m_pen.GetColour().GetPixel();
329 }
330
331 // return the color of the pixel
332 if( col )
333 {
334 col->Set(GetRValue(pixelcolor),
335 GetGValue(pixelcolor),
336 GetBValue(pixelcolor));
337 }
338
339 // check, if color of the pixels is the same as the color of the current
340 // pen and return TRUE if it is, FALSE otherwise
341 return pixelcolor == pencolor;
342 }
343
344 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
345 {
346 wxCoord x1 = x-VIEWPORT_EXTENT;
347 wxCoord y1 = y-VIEWPORT_EXTENT;
348 wxCoord x2 = x+VIEWPORT_EXTENT;
349 wxCoord y2 = y+VIEWPORT_EXTENT;
350
351 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
352 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
353
354 (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
355 (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
356
357 CalcBoundingBox(x1, y1);
358 CalcBoundingBox(x2, y2);
359 }
360
361 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
362 {
363 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
364 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
365
366 /* MATTHEW: [6] New normalization */
367 #if WX_STANDARD_GRAPHICS
368 (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
369 #endif
370
371 CalcBoundingBox(x1, y1);
372 CalcBoundingBox(x2, y2);
373 }
374
375 void wxDC::DoDrawArc(wxCoord x1,wxCoord y1,wxCoord x2,wxCoord y2, wxCoord xc, wxCoord yc)
376 {
377 double dx = xc-x1;
378 double dy = yc-y1;
379 double radius = (double)sqrt(dx*dx+dy*dy) ;;
380 if (x1==x2 && x2==y2)
381 {
382 DrawEllipse(xc,yc,(wxCoord)(radius*2.0),(wxCoord)(radius*2.0));
383 return;
384 }
385
386 wxCoord xx1 = XLOG2DEV(x1);
387 wxCoord yy1 = YLOG2DEV(y1);
388 wxCoord xx2 = XLOG2DEV(x2);
389 wxCoord yy2 = YLOG2DEV(y2);
390 wxCoord xxc = XLOG2DEV(xc);
391 wxCoord yyc = YLOG2DEV(yc);
392 wxCoord ray = (wxCoord) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
393
394 (void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
395 wxCoord xxx1 = (wxCoord) (xxc-ray);
396 wxCoord yyy1 = (wxCoord) (yyc-ray);
397 wxCoord xxx2 = (wxCoord) (xxc+ray);
398 wxCoord yyy2 = (wxCoord) (yyc+ray);
399 if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
400 {
401 // Have to add 1 to bottom-right corner of rectangle
402 // to make semi-circles look right (crooked line otherwise).
403 // Unfortunately this is not a reliable method, depends
404 // on the size of shape.
405 // TODO: figure out why this happens!
406 Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
407 xx1,yy1,xx2,yy2);
408 }
409 else
410 Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
411 xx1,yy1,xx2,yy2);
412
413 CalcBoundingBox((wxCoord)(xc-radius), (wxCoord)(yc-radius));
414 CalcBoundingBox((wxCoord)(xc+radius), (wxCoord)(yc+radius));
415 }
416
417 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
418 {
419 COLORREF color = 0x00ffffff;
420 if (m_pen.Ok())
421 {
422 color = m_pen.GetColour().GetPixel();
423 }
424
425 SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
426
427 CalcBoundingBox(x, y);
428 }
429
430 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
431 {
432 COLORREF old_textground = ::GetTextColor(GetHdc());
433 COLORREF old_background = ::GetBkColor(GetHdc());
434 if (m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE)
435 {
436
437 if (m_textForegroundColour.Ok())
438 { //just the oposite from what is expected see help on pattern brush
439 // 1 in mask becomes bk color
440 ::SetBkColor(GetHdc(), m_textForegroundColour.GetPixel() );
441 }
442 if (m_textBackgroundColour.Ok())
443 { //just the oposite from what is expected
444 // 0 in mask becomes text color
445 ::SetTextColor(GetHdc(), m_textBackgroundColour.GetPixel() );
446 }
447
448 if (m_backgroundMode == wxTRANSPARENT)
449 SetBkMode(GetHdc(), TRANSPARENT);
450 else
451 SetBkMode(GetHdc(), OPAQUE);
452 }
453
454 // Do things less efficiently if we have offsets
455 if (xoffset != 0 || yoffset != 0)
456 {
457 POINT *cpoints = new POINT[n];
458 int i;
459 for (i = 0; i < n; i++)
460 {
461 cpoints[i].x = (int)(points[i].x + xoffset);
462 cpoints[i].y = (int)(points[i].y + yoffset);
463
464 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
465 }
466 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
467 (void)Polygon(GetHdc(), cpoints, n);
468 SetPolyFillMode(GetHdc(),prev);
469 delete[] cpoints;
470 }
471 else
472 {
473 int i;
474 for (i = 0; i < n; i++)
475 CalcBoundingBox(points[i].x, points[i].y);
476
477 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
478 (void)Polygon(GetHdc(), (POINT*) points, n);
479 SetPolyFillMode(GetHdc(),prev);
480 }
481
482 if (m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE)
483 {
484 ::SetBkMode(GetHdc(), TRANSPARENT);
485 ::SetTextColor(GetHdc(), old_textground);
486 ::SetBkColor(GetHdc(), old_background);
487 }
488 }
489
490 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
491 {
492 // Do things less efficiently if we have offsets
493 if (xoffset != 0 || yoffset != 0)
494 {
495 POINT *cpoints = new POINT[n];
496 int i;
497 for (i = 0; i < n; i++)
498 {
499 cpoints[i].x = (int)(points[i].x + xoffset);
500 cpoints[i].y = (int)(points[i].y + yoffset);
501
502 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
503 }
504 (void)Polyline(GetHdc(), cpoints, n);
505 delete[] cpoints;
506 }
507 else
508 {
509 int i;
510 for (i = 0; i < n; i++)
511 CalcBoundingBox(points[i].x, points[i].y);
512
513 (void)Polyline(GetHdc(), (POINT*) points, n);
514 }
515 }
516
517 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
518 {
519 COLORREF colFgOld = 0,
520 colBgOld = 0;
521
522 if ( m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
523 {
524 colFgOld = ::GetTextColor(GetHdc());
525 colBgOld = ::GetBkColor(GetHdc());
526
527 if ( m_textForegroundColour.Ok() )
528 {
529 // just the oposite from what is expected see help on pattern brush
530 // 1 in mask becomes bk color
531 ::SetBkColor(GetHdc(), m_textForegroundColour.GetPixel());
532 }
533
534 if ( m_textBackgroundColour.Ok() )
535 {
536 // 0 in mask becomes text color
537 ::SetTextColor(GetHdc(), m_textBackgroundColour.GetPixel());
538 }
539
540 // VZ: IMHO this does strictly nothing here
541 SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
542 : OPAQUE);
543 }
544
545 wxCoord x2 = x + width;
546 wxCoord y2 = y + height;
547
548 // Windows draws the filled rectangles without outline (i.e. drawn with a
549 // transparent pen) one pixel smaller in both directions and we want them
550 // to have the same size regardless of which pen is used - adjust
551 if ( m_pen.GetStyle() == wxTRANSPARENT )
552 {
553 x2++;
554 y2++;
555 }
556
557 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
558
559 CalcBoundingBox(x, y);
560 CalcBoundingBox(x2, y2);
561
562 if ( m_brush.GetStyle() == wxSTIPPLE_MASK_OPAQUE )
563 {
564 // restore the colours we changed
565 ::SetBkMode(GetHdc(), TRANSPARENT);
566 ::SetTextColor(GetHdc(), colFgOld);
567 ::SetBkColor(GetHdc(), colBgOld);
568 }
569 }
570
571 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
572 {
573 // Now, a negative radius value is interpreted to mean
574 // 'the proportion of the smallest X or Y dimension'
575
576 if (radius < 0.0)
577 {
578 double smallest = 0.0;
579 if (width < height)
580 smallest = width;
581 else
582 smallest = height;
583 radius = (- radius * smallest);
584 }
585
586 wxCoord x2 = (x+width);
587 wxCoord y2 = (y+height);
588
589 (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
590 YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
591
592 CalcBoundingBox(x, y);
593 CalcBoundingBox(x2, y2);
594 }
595
596 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
597 {
598 wxCoord x2 = (x+width);
599 wxCoord y2 = (y+height);
600
601 (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
602
603 CalcBoundingBox(x, y);
604 CalcBoundingBox(x2, y2);
605 }
606
607 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
608 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
609 {
610 wxCoord x2 = (x+w);
611 wxCoord y2 = (y+h);
612
613 int rx1 = XLOG2DEV(x+w/2);
614 int ry1 = YLOG2DEV(y+h/2);
615 int rx2 = rx1;
616 int ry2 = ry1;
617
618 sa = DegToRad(sa);
619 ea = DegToRad(ea);
620
621 rx1 += (int)(100.0 * abs(w) * cos(sa));
622 ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa));
623 rx2 += (int)(100.0 * abs(w) * cos(ea));
624 ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
625
626 // draw pie with NULL_PEN first and then outline otherwise a line is
627 // drawn from the start and end points to the centre
628 HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
629 if (m_signY > 0)
630 {
631 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
632 rx1, ry1, rx2, ry2);
633 }
634 else
635 {
636 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
637 rx1, ry1-1, rx2, ry2-1);
638 }
639 ::SelectObject(GetHdc(), orig_pen);
640 (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
641 rx1, ry1, rx2, ry2);
642
643 CalcBoundingBox(x, y);
644 CalcBoundingBox(x2, y2);
645 }
646
647 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
648 {
649 wxCHECK_RET( icon.Ok(), wxT("invalid icon in DrawIcon") );
650
651 ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), GetHiconOf(icon));
652
653 CalcBoundingBox(x, y);
654 CalcBoundingBox(x + icon.GetWidth(), y + icon.GetHeight());
655 }
656
657 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
658 {
659 wxCHECK_RET( bmp.Ok(), _T("invalid bitmap in wxDC::DrawBitmap") );
660
661 int width = bmp.GetWidth(),
662 height = bmp.GetHeight();
663
664 HBITMAP hbmpMask = 0;
665
666 if ( useMask )
667 {
668 wxMask *mask = bmp.GetMask();
669 if ( mask )
670 hbmpMask = (HBITMAP)mask->GetMaskBitmap();
671
672 if ( !hbmpMask )
673 {
674 // don't give assert here because this would break existing
675 // programs - just silently ignore useMask parameter
676 useMask = FALSE;
677 }
678 }
679
680 if ( useMask )
681 {
682 #ifdef __WIN32__
683 HDC hdcMem = ::CreateCompatibleDC(GetHdc());
684 ::SelectObject(hdcMem, GetHbitmapOf(bmp));
685
686 // use MaskBlt() with ROP which doesn't do anything to dst in the mask
687 // points
688 bool ok = ::MaskBlt(GetHdc(), x, y, width, height,
689 hdcMem, 0, 0,
690 hbmpMask, 0, 0,
691 MAKEROP4(SRCCOPY, DSTCOPY)) != 0;
692 ::DeleteDC(hdcMem);
693
694 if ( !ok )
695 #endif // Win32
696 {
697 // Rather than reproduce wxDC::Blit, let's do it at the wxWin API
698 // level
699 wxMemoryDC memDC;
700 memDC.SelectObject(bmp);
701
702 Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
703
704 memDC.SelectObject(wxNullBitmap);
705 }
706 }
707 else // no mask, just use BitBlt()
708 {
709 HDC cdc = GetHdc();
710 HDC memdc = ::CreateCompatibleDC( cdc );
711 HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
712
713 wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
714
715 COLORREF old_textground = ::GetTextColor(GetHdc());
716 COLORREF old_background = ::GetBkColor(GetHdc());
717 if (m_textForegroundColour.Ok())
718 {
719 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
720 }
721 if (m_textBackgroundColour.Ok())
722 {
723 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
724 }
725
726 ::SelectObject( memdc, hbitmap );
727 ::BitBlt( cdc, x, y, width, height, memdc, 0, 0, SRCCOPY);
728 ::DeleteDC( memdc );
729
730 ::SetTextColor(GetHdc(), old_textground);
731 ::SetBkColor(GetHdc(), old_background);
732 }
733 }
734
735 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
736 {
737 DrawAnyText(text, x, y);
738
739 // update the bounding box
740 CalcBoundingBox(x, y);
741
742 wxCoord w, h;
743 GetTextExtent(text, &w, &h);
744 CalcBoundingBox(x + w, y + h);
745 }
746
747 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
748 {
749 // prepare for drawing the text
750 if ( m_textForegroundColour.Ok() )
751 SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
752
753 DWORD old_background = 0;
754 if ( m_textBackgroundColour.Ok() )
755 {
756 old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
757 }
758
759 SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
760 : OPAQUE);
761
762 if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
763 text.c_str(), text.length()) == 0 )
764 {
765 wxLogLastError("TextOut");
766 }
767
768 // restore the old parameters (text foreground colour may be left because
769 // it never is set to anything else, but background should remain
770 // transparent even if we just drew an opaque string)
771 if ( m_textBackgroundColour.Ok() )
772 (void)SetBkColor(GetHdc(), old_background);
773
774 SetBkMode(GetHdc(), TRANSPARENT);
775 }
776
777 void wxDC::DoDrawRotatedText(const wxString& text,
778 wxCoord x, wxCoord y,
779 double angle)
780 {
781 // we test that we have some font because otherwise we should still use the
782 // "else" part below to avoid that DrawRotatedText(angle = 180) and
783 // DrawRotatedText(angle = 0) use different fonts (we can't use the default
784 // font for drawing rotated fonts unfortunately)
785 if ( (angle == 0.0) && m_font.Ok() )
786 {
787 DoDrawText(text, x, y);
788 }
789 else
790 {
791 // NB: don't take DEFAULT_GUI_FONT because it's not TrueType and so
792 // can't have non zero orientation/escapement
793 wxFont font = m_font.Ok() ? m_font : *wxNORMAL_FONT;
794 HFONT hfont = (HFONT)font.GetResourceHandle();
795 LOGFONT lf;
796 if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
797 {
798 wxLogLastError("GetObject(hfont)");
799 }
800
801 // GDI wants the angle in tenth of degree
802 long angle10 = (long)(angle * 10);
803 lf.lfEscapement = angle10;
804 lf. lfOrientation = angle10;
805
806 hfont = ::CreateFontIndirect(&lf);
807 if ( !hfont )
808 {
809 wxLogLastError("CreateFont");
810 }
811 else
812 {
813 HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
814
815 DrawAnyText(text, x, y);
816
817 (void)::SelectObject(GetHdc(), hfontOld);
818 (void)::DeleteObject(hfont);
819 }
820
821 // call the bounding box by adding all four vertices of the rectangle
822 // containing the text to it (simpler and probably not slower than
823 // determining which of them is really topmost/leftmost/...)
824 wxCoord w, h;
825 GetTextExtent(text, &w, &h);
826
827 double rad = DegToRad(angle);
828
829 // "upper left" and "upper right"
830 CalcBoundingBox(x, y);
831 CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
832
833 // "bottom left" and "bottom right"
834 x += (wxCoord)(h*sin(rad));
835 y += (wxCoord)(h*cos(rad));
836 CalcBoundingBox(x, y);
837 CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
838 }
839 }
840
841 // ---------------------------------------------------------------------------
842 // set GDI objects
843 // ---------------------------------------------------------------------------
844
845 void wxDC::SetPalette(const wxPalette& palette)
846 {
847 // Set the old object temporarily, in case the assignment deletes an object
848 // that's not yet selected out.
849 if (m_oldPalette)
850 {
851 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
852 m_oldPalette = 0;
853 }
854
855 m_palette = palette;
856
857 if (!m_palette.Ok())
858 {
859 // Setting a NULL colourmap is a way of restoring
860 // the original colourmap
861 if (m_oldPalette)
862 {
863 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
864 m_oldPalette = 0;
865 }
866
867 return;
868 }
869
870 if (m_palette.Ok() && m_palette.GetHPALETTE())
871 {
872 HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
873 if (!m_oldPalette)
874 m_oldPalette = (WXHPALETTE) oldPal;
875
876 ::RealizePalette(GetHdc());
877 }
878 }
879
880 void wxDC::SetFont(const wxFont& the_font)
881 {
882 // Set the old object temporarily, in case the assignment deletes an object
883 // that's not yet selected out.
884 if (m_oldFont)
885 {
886 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
887 m_oldFont = 0;
888 }
889
890 m_font = the_font;
891
892 if (!the_font.Ok())
893 {
894 if (m_oldFont)
895 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
896 m_oldFont = 0;
897 }
898
899 if (m_font.Ok() && m_font.GetResourceHandle())
900 {
901 HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
902 if (f == (HFONT) NULL)
903 {
904 wxLogDebug(wxT("::SelectObject failed in wxDC::SetFont."));
905 }
906 if (!m_oldFont)
907 m_oldFont = (WXHFONT) f;
908 }
909 }
910
911 void wxDC::SetPen(const wxPen& pen)
912 {
913 // Set the old object temporarily, in case the assignment deletes an object
914 // that's not yet selected out.
915 if (m_oldPen)
916 {
917 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
918 m_oldPen = 0;
919 }
920
921 m_pen = pen;
922
923 if (!m_pen.Ok())
924 {
925 if (m_oldPen)
926 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
927 m_oldPen = 0;
928 }
929
930 if (m_pen.Ok())
931 {
932 if (m_pen.GetResourceHandle())
933 {
934 HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
935 if (!m_oldPen)
936 m_oldPen = (WXHPEN) p;
937 }
938 }
939 }
940
941 void wxDC::SetBrush(const wxBrush& brush)
942 {
943 // Set the old object temporarily, in case the assignment deletes an object
944 // that's not yet selected out.
945 if (m_oldBrush)
946 {
947 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
948 m_oldBrush = 0;
949 }
950
951 m_brush = brush;
952
953 if (!m_brush.Ok())
954 {
955 if (m_oldBrush)
956 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
957 m_oldBrush = 0;
958 }
959
960 if (m_brush.Ok())
961 {
962 if (m_brush.GetResourceHandle())
963 {
964 HBRUSH b = 0;
965 b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
966 if (!m_oldBrush)
967 m_oldBrush = (WXHBRUSH) b;
968 }
969 }
970 }
971
972 void wxDC::SetBackground(const wxBrush& brush)
973 {
974 m_backgroundBrush = brush;
975
976 if (!m_backgroundBrush.Ok())
977 return;
978
979 if (m_canvas)
980 {
981 bool customColours = TRUE;
982 // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
983 // change background colours from the control-panel specified colours.
984 if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
985 customColours = FALSE;
986
987 if (customColours)
988 {
989 if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
990 {
991 m_canvas->SetTransparent(TRUE);
992 }
993 else
994 {
995 // New behaviour, 10/2/99: setting the background brush of a DC
996 // doesn't affect the window background colour. However,
997 // I'm leaving in the transparency setting because it's needed by
998 // various controls (e.g. wxStaticText) to determine whether to draw
999 // transparently or not. TODO: maybe this should be a new function
1000 // wxWindow::SetTransparency(). Should that apply to the child itself, or the
1001 // parent?
1002 // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
1003 m_canvas->SetTransparent(FALSE);
1004 }
1005 }
1006 }
1007 COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
1008 {
1009 (void)SetBkColor(GetHdc(), new_color);
1010 }
1011 }
1012
1013 void wxDC::SetBackgroundMode(int mode)
1014 {
1015 m_backgroundMode = mode;
1016
1017 // SetBackgroundColour now only refers to text background
1018 // and m_backgroundMode is used there
1019
1020 /*
1021 if (m_backgroundMode == wxTRANSPARENT)
1022 ::SetBkMode(GetHdc(), TRANSPARENT);
1023 else
1024 ::SetBkMode(GetHdc(), OPAQUE);
1025 */
1026 }
1027
1028 void wxDC::SetLogicalFunction(int function)
1029 {
1030 m_logicalFunction = function;
1031
1032 SetRop(m_hDC);
1033 }
1034
1035 void wxDC::SetRop(WXHDC dc)
1036 {
1037 if ( !dc || m_logicalFunction < 0 )
1038 return;
1039
1040 int rop;
1041
1042 switch (m_logicalFunction)
1043 {
1044 case wxCLEAR: rop = R2_BLACK; break;
1045 case wxXOR: rop = R2_XORPEN; break;
1046 case wxINVERT: rop = R2_NOT; break;
1047 case wxOR_REVERSE: rop = R2_MERGEPENNOT; break;
1048 case wxAND_REVERSE: rop = R2_MASKPENNOT; break;
1049 case wxCOPY: rop = R2_COPYPEN; break;
1050 case wxAND: rop = R2_MASKPEN; break;
1051 case wxAND_INVERT: rop = R2_MASKNOTPEN; break;
1052 case wxNO_OP: rop = R2_NOP; break;
1053 case wxNOR: rop = R2_NOTMERGEPEN; break;
1054 case wxEQUIV: rop = R2_NOTXORPEN; break;
1055 case wxSRC_INVERT: rop = R2_NOTCOPYPEN; break;
1056 case wxOR_INVERT: rop = R2_MERGENOTPEN; break;
1057 case wxNAND: rop = R2_NOTMASKPEN; break;
1058 case wxOR: rop = R2_MERGEPEN; break;
1059 case wxSET: rop = R2_WHITE; break;
1060
1061 default:
1062 wxFAIL_MSG( wxT("unsupported logical function") );
1063 return;
1064 }
1065
1066 SetROP2(GetHdc(), rop);
1067 }
1068
1069 bool wxDC::StartDoc(const wxString& message)
1070 {
1071 // We might be previewing, so return TRUE to let it continue.
1072 return TRUE;
1073 }
1074
1075 void wxDC::EndDoc()
1076 {
1077 }
1078
1079 void wxDC::StartPage()
1080 {
1081 }
1082
1083 void wxDC::EndPage()
1084 {
1085 }
1086
1087 // ---------------------------------------------------------------------------
1088 // text metrics
1089 // ---------------------------------------------------------------------------
1090
1091 wxCoord wxDC::GetCharHeight() const
1092 {
1093 TEXTMETRIC lpTextMetric;
1094
1095 GetTextMetrics(GetHdc(), &lpTextMetric);
1096
1097 return YDEV2LOGREL(lpTextMetric.tmHeight);
1098 }
1099
1100 wxCoord wxDC::GetCharWidth() const
1101 {
1102 TEXTMETRIC lpTextMetric;
1103
1104 GetTextMetrics(GetHdc(), &lpTextMetric);
1105
1106 return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
1107 }
1108
1109 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
1110 wxCoord *descent, wxCoord *externalLeading,
1111 wxFont *theFont) const
1112 {
1113 wxFont *fontToUse = (wxFont*) theFont;
1114 if (!fontToUse)
1115 fontToUse = (wxFont*) &m_font;
1116
1117 SIZE sizeRect;
1118 TEXTMETRIC tm;
1119
1120 GetTextExtentPoint(GetHdc(), WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
1121 GetTextMetrics(GetHdc(), &tm);
1122
1123 if (x) *x = XDEV2LOGREL(sizeRect.cx);
1124 if (y) *y = YDEV2LOGREL(sizeRect.cy);
1125 if (descent) *descent = tm.tmDescent;
1126 if (externalLeading) *externalLeading = tm.tmExternalLeading;
1127 }
1128
1129 void wxDC::SetMapMode(int mode)
1130 {
1131 m_mappingMode = mode;
1132
1133 int pixel_width = 0;
1134 int pixel_height = 0;
1135 int mm_width = 0;
1136 int mm_height = 0;
1137
1138 pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
1139 pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
1140 mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
1141 mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
1142
1143 if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
1144 {
1145 return;
1146 }
1147
1148 double mm2pixelsX = pixel_width/mm_width;
1149 double mm2pixelsY = pixel_height/mm_height;
1150
1151 switch (mode)
1152 {
1153 case wxMM_TWIPS:
1154 {
1155 m_logicalScaleX = (twips2mm * mm2pixelsX);
1156 m_logicalScaleY = (twips2mm * mm2pixelsY);
1157 break;
1158 }
1159 case wxMM_POINTS:
1160 {
1161 m_logicalScaleX = (pt2mm * mm2pixelsX);
1162 m_logicalScaleY = (pt2mm * mm2pixelsY);
1163 break;
1164 }
1165 case wxMM_METRIC:
1166 {
1167 m_logicalScaleX = mm2pixelsX;
1168 m_logicalScaleY = mm2pixelsY;
1169 break;
1170 }
1171 case wxMM_LOMETRIC:
1172 {
1173 m_logicalScaleX = (mm2pixelsX/10.0);
1174 m_logicalScaleY = (mm2pixelsY/10.0);
1175 break;
1176 }
1177 default:
1178 case wxMM_TEXT:
1179 {
1180 m_logicalScaleX = 1.0;
1181 m_logicalScaleY = 1.0;
1182 break;
1183 }
1184 }
1185
1186 if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
1187 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1188
1189 SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1190 m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
1191 m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
1192 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
1193 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1194 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1195 }
1196
1197 void wxDC::SetUserScale(double x, double y)
1198 {
1199 m_userScaleX = x;
1200 m_userScaleY = y;
1201
1202 SetMapMode(m_mappingMode);
1203 }
1204
1205 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1206 {
1207 m_signX = xLeftRight ? 1 : -1;
1208 m_signY = yBottomUp ? -1 : 1;
1209
1210 SetMapMode(m_mappingMode);
1211 }
1212
1213 void wxDC::SetSystemScale(double x, double y)
1214 {
1215 m_scaleX = x;
1216 m_scaleY = y;
1217
1218 SetMapMode(m_mappingMode);
1219 }
1220
1221 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
1222 {
1223 m_logicalOriginX = x;
1224 m_logicalOriginY = y;
1225
1226 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1227 }
1228
1229 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
1230 {
1231 m_deviceOriginX = x;
1232 m_deviceOriginY = y;
1233
1234 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1235 }
1236
1237 // ---------------------------------------------------------------------------
1238 // coordinates transformations
1239 // ---------------------------------------------------------------------------
1240
1241 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
1242 {
1243 return (wxCoord) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1244 }
1245
1246 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
1247 {
1248 return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1249 }
1250
1251 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
1252 {
1253 return (wxCoord) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1254 }
1255
1256 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
1257 {
1258 return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1259 }
1260
1261 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
1262 {
1263 return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1264 }
1265
1266 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
1267 {
1268 return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1269 }
1270
1271 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
1272 {
1273 return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1274 }
1275
1276 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
1277 {
1278 return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1279 }
1280
1281 // ---------------------------------------------------------------------------
1282 // bit blit
1283 // ---------------------------------------------------------------------------
1284
1285 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
1286 wxCoord width, wxCoord height,
1287 wxDC *source, wxCoord xsrc, wxCoord ysrc,
1288 int rop, bool useMask)
1289 {
1290 wxMask *mask = NULL;
1291 if ( useMask )
1292 {
1293 const wxBitmap& bmp = source->m_selectedBitmap;
1294 mask = bmp.GetMask();
1295
1296 if ( !(bmp.Ok() && mask && mask->GetMaskBitmap()) )
1297 {
1298 // don't give assert here because this would break existing
1299 // programs - just silently ignore useMask parameter
1300 useMask = FALSE;
1301 }
1302 }
1303
1304 COLORREF old_textground = ::GetTextColor(GetHdc());
1305 COLORREF old_background = ::GetBkColor(GetHdc());
1306 if (m_textForegroundColour.Ok())
1307 {
1308 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1309 }
1310 if (m_textBackgroundColour.Ok())
1311 {
1312 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1313 }
1314
1315 DWORD dwRop = SRCCOPY;
1316 switch (rop)
1317 {
1318 case wxXOR: dwRop = SRCINVERT; break;
1319 case wxINVERT: dwRop = DSTINVERT; break;
1320 case wxOR_REVERSE: dwRop = 0x00DD0228; break;
1321 case wxAND_REVERSE: dwRop = SRCERASE; break;
1322 case wxCLEAR: dwRop = BLACKNESS; break;
1323 case wxSET: dwRop = WHITENESS; break;
1324 case wxOR_INVERT: dwRop = MERGEPAINT; break;
1325 case wxAND: dwRop = SRCAND; break;
1326 case wxOR: dwRop = SRCPAINT; break;
1327 case wxEQUIV: dwRop = 0x00990066; break;
1328 case wxNAND: dwRop = 0x007700E6; break;
1329 case wxAND_INVERT: dwRop = 0x00220326; break;
1330 case wxCOPY: dwRop = SRCCOPY; break;
1331 case wxNO_OP: dwRop = DSTCOPY; break;
1332 case wxSRC_INVERT: dwRop = NOTSRCCOPY; break;
1333 case wxNOR: dwRop = NOTSRCCOPY; break;
1334 default:
1335 wxFAIL_MSG( wxT("unsupported logical function") );
1336 return FALSE;
1337 }
1338
1339 bool success;
1340
1341 if (useMask)
1342 {
1343 #ifdef __WIN32__
1344 // we want the part of the image corresponding to the mask to be
1345 // transparent, so use "DSTCOPY" ROP for the mask points (the usual
1346 // meaning of fg and bg is inverted which corresponds to wxWin notion
1347 // of the mask which is also contrary to the Windows one)
1348 success = ::MaskBlt(GetHdc(), xdest, ydest, width, height,
1349 GetHdcOf(*source), xsrc, ysrc,
1350 (HBITMAP)mask->GetMaskBitmap(), 0, 0,
1351 MAKEROP4(dwRop, DSTCOPY)) != 0;
1352
1353 if ( !success )
1354 #endif // Win32
1355 {
1356 // Blit bitmap with mask
1357
1358 // create a temp buffer bitmap and DCs to access it and the mask
1359 HDC dc_mask = ::CreateCompatibleDC(GetHdcOf(*source));
1360 HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
1361 HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
1362 ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
1363 ::SelectObject(dc_buffer, buffer_bmap);
1364
1365 // copy dest to buffer
1366 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1367 GetHdc(), xdest, ydest, SRCCOPY) )
1368 {
1369 wxLogLastError("BitBlt");
1370 }
1371
1372 // copy src to buffer using selected raster op
1373 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1374 GetHdcOf(*source), xsrc, ysrc, dwRop) )
1375 {
1376 wxLogLastError("BitBlt");
1377 }
1378
1379 // set masked area in buffer to BLACK (pixel value 0)
1380 COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
1381 COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
1382 if ( !::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1383 dc_mask, xsrc, ysrc, SRCAND) )
1384 {
1385 wxLogLastError("BitBlt");
1386 }
1387
1388 // set unmasked area in dest to BLACK
1389 ::SetBkColor(GetHdc(), RGB(0, 0, 0));
1390 ::SetTextColor(GetHdc(), RGB(255, 255, 255));
1391 if ( !::BitBlt(GetHdc(), xdest, ydest, (int)width, (int)height,
1392 dc_mask, xsrc, ysrc, SRCAND) )
1393 {
1394 wxLogLastError("BitBlt");
1395 }
1396 ::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
1397 ::SetTextColor(GetHdc(), prevCol);
1398
1399 // OR buffer to dest
1400 success = ::BitBlt(GetHdc(), xdest, ydest,
1401 (int)width, (int)height,
1402 dc_buffer, 0, 0, SRCPAINT) != 0;
1403 if ( !success )
1404 {
1405 wxLogLastError("BitBlt");
1406 }
1407
1408 // tidy up temporary DCs and bitmap
1409 ::SelectObject(dc_mask, 0);
1410 ::DeleteDC(dc_mask);
1411 ::SelectObject(dc_buffer, 0);
1412 ::DeleteDC(dc_buffer);
1413 ::DeleteObject(buffer_bmap);
1414 }
1415 }
1416 else // no mask, just BitBlt() it
1417 {
1418 success = ::BitBlt(GetHdc(), xdest, ydest,
1419 (int)width, (int)height,
1420 GetHdcOf(*source), xsrc, ysrc, dwRop) != 0;
1421 if ( !success )
1422 {
1423 wxLogLastError("BitBlt");
1424 }
1425 }
1426 ::SetTextColor(GetHdc(), old_textground);
1427 ::SetBkColor(GetHdc(), old_background);
1428
1429 return success;
1430 }
1431
1432 void wxDC::DoGetSize(int *w, int *h) const
1433 {
1434 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
1435 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
1436 }
1437
1438 void wxDC::DoGetSizeMM(int *w, int *h) const
1439 {
1440 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
1441 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1442 }
1443
1444 wxSize wxDC::GetPPI() const
1445 {
1446 int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
1447 int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
1448
1449 return wxSize(x, y);
1450 }
1451
1452 // For use by wxWindows only, unless custom units are required.
1453 void wxDC::SetLogicalScale(double x, double y)
1454 {
1455 m_logicalScaleX = x;
1456 m_logicalScaleY = y;
1457 }
1458
1459 #if WXWIN_COMPATIBILITY
1460 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1461 float *descent, float *externalLeading,
1462 wxFont *theFont, bool use16bit) const
1463 {
1464 wxCoord x1, y1, descent1, externalLeading1;
1465 GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1466 *x = x1; *y = y1;
1467 if (descent)
1468 *descent = descent1;
1469 if (externalLeading)
1470 *externalLeading = externalLeading1;
1471 }
1472 #endif
1473
1474 // ---------------------------------------------------------------------------
1475 // spline drawing code
1476 // ---------------------------------------------------------------------------
1477
1478 #if wxUSE_SPLINES
1479
1480 class wxSpline: public wxObject
1481 {
1482 public:
1483 int type;
1484 wxList *points;
1485
1486 wxSpline(wxList *list);
1487 void DeletePoints();
1488
1489 // Doesn't delete points
1490 ~wxSpline();
1491 };
1492
1493 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1494
1495 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1496 double a3, double b3, double a4, double b4);
1497 void wx_clear_stack();
1498 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1499 double *y3, double *x4, double *y4);
1500 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1501 double x4, double y4);
1502 static bool wx_spline_add_point(double x, double y);
1503 static void wx_spline_draw_point_array(wxDC *dc);
1504 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1505
1506 void wxDC::DoDrawSpline(wxList *list)
1507 {
1508 wxSpline spline(list);
1509
1510 wx_draw_open_spline(this, &spline);
1511 }
1512
1513 wxList wx_spline_point_list;
1514
1515 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1516 {
1517 wxPoint *p;
1518 double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1519 double x1, y1, x2, y2;
1520
1521 wxNode *node = spline->points->First();
1522 p = (wxPoint *)node->Data();
1523
1524 x1 = p->x;
1525 y1 = p->y;
1526
1527 node = node->Next();
1528 p = (wxPoint *)node->Data();
1529
1530 x2 = p->x;
1531 y2 = p->y;
1532 cx1 = (double)((x1 + x2) / 2);
1533 cy1 = (double)((y1 + y2) / 2);
1534 cx2 = (double)((cx1 + x2) / 2);
1535 cy2 = (double)((cy1 + y2) / 2);
1536
1537 wx_spline_add_point(x1, y1);
1538
1539 while ((node = node->Next()) != NULL)
1540 {
1541 p = (wxPoint *)node->Data();
1542 x1 = x2;
1543 y1 = y2;
1544 x2 = p->x;
1545 y2 = p->y;
1546 cx4 = (double)(x1 + x2) / 2;
1547 cy4 = (double)(y1 + y2) / 2;
1548 cx3 = (double)(x1 + cx4) / 2;
1549 cy3 = (double)(y1 + cy4) / 2;
1550
1551 wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1552
1553 cx1 = cx4;
1554 cy1 = cy4;
1555 cx2 = (double)(cx1 + x2) / 2;
1556 cy2 = (double)(cy1 + y2) / 2;
1557 }
1558
1559 wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1560 wx_spline_add_point(x2, y2);
1561
1562 wx_spline_draw_point_array(dc);
1563
1564 }
1565
1566 /********************* CURVES FOR SPLINES *****************************
1567
1568 The following spline drawing routine is from
1569
1570 "An Algorithm for High-Speed Curve Generation"
1571 by George Merrill Chaikin,
1572 Computer Graphics and Image Processing, 3, Academic Press,
1573 1974, 346-349.
1574
1575 and
1576
1577 "On Chaikin's Algorithm" by R. F. Riesenfeld,
1578 Computer Graphics and Image Processing, 4, Academic Press,
1579 1975, 304-310.
1580
1581 ***********************************************************************/
1582
1583 #define half(z1, z2) ((z1+z2)/2.0)
1584 #define THRESHOLD 5
1585
1586 /* iterative version */
1587
1588 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1589 double b4)
1590 {
1591 register double xmid, ymid;
1592 double x1, y1, x2, y2, x3, y3, x4, y4;
1593
1594 wx_clear_stack();
1595 wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1596
1597 while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1598 xmid = (double)half(x2, x3);
1599 ymid = (double)half(y2, y3);
1600 if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1601 fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1602 wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1603 wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1604 } else {
1605 wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1606 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1607 wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1608 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1609 }
1610 }
1611 }
1612
1613
1614 /* utilities used by spline drawing routines */
1615
1616
1617 typedef struct wx_spline_stack_struct {
1618 double x1, y1, x2, y2, x3, y3, x4, y4;
1619 }
1620 Stack;
1621
1622 #define SPLINE_STACK_DEPTH 20
1623 static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
1624 static Stack *wx_stack_top;
1625 static int wx_stack_count;
1626
1627 void wx_clear_stack()
1628 {
1629 wx_stack_top = wx_spline_stack;
1630 wx_stack_count = 0;
1631 }
1632
1633 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1634 {
1635 wx_stack_top->x1 = x1;
1636 wx_stack_top->y1 = y1;
1637 wx_stack_top->x2 = x2;
1638 wx_stack_top->y2 = y2;
1639 wx_stack_top->x3 = x3;
1640 wx_stack_top->y3 = y3;
1641 wx_stack_top->x4 = x4;
1642 wx_stack_top->y4 = y4;
1643 wx_stack_top++;
1644 wx_stack_count++;
1645 }
1646
1647 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1648 double *x3, double *y3, double *x4, double *y4)
1649 {
1650 if (wx_stack_count == 0)
1651 return (0);
1652 wx_stack_top--;
1653 wx_stack_count--;
1654 *x1 = wx_stack_top->x1;
1655 *y1 = wx_stack_top->y1;
1656 *x2 = wx_stack_top->x2;
1657 *y2 = wx_stack_top->y2;
1658 *x3 = wx_stack_top->x3;
1659 *y3 = wx_stack_top->y3;
1660 *x4 = wx_stack_top->x4;
1661 *y4 = wx_stack_top->y4;
1662 return (1);
1663 }
1664
1665 static bool wx_spline_add_point(double x, double y)
1666 {
1667 wxPoint *point = new wxPoint;
1668 point->x = (int) x;
1669 point->y = (int) y;
1670 wx_spline_point_list.Append((wxObject*)point);
1671 return TRUE;
1672 }
1673
1674 static void wx_spline_draw_point_array(wxDC *dc)
1675 {
1676 dc->DrawLines(&wx_spline_point_list, 0, 0);
1677 wxNode *node = wx_spline_point_list.First();
1678 while (node)
1679 {
1680 wxPoint *point = (wxPoint *)node->Data();
1681 delete point;
1682 delete node;
1683 node = wx_spline_point_list.First();
1684 }
1685 }
1686
1687 wxSpline::wxSpline(wxList *list)
1688 {
1689 points = list;
1690 }
1691
1692 wxSpline::~wxSpline()
1693 {
1694 }
1695
1696 void wxSpline::DeletePoints()
1697 {
1698 for(wxNode *node = points->First(); node; node = points->First())
1699 {
1700 wxPoint *point = (wxPoint *)node->Data();
1701 delete point;
1702 delete node;
1703 }
1704 delete points;
1705 }
1706
1707
1708 #endif // wxUSE_SPLINES
1709
wxWidgets (Impactor)