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1 | ///////////////////////////////////////////////////////////////////////////// |
2 | // Name: dcmemory.cpp | |
3 | // Purpose: wxMemoryDC 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 | #ifdef __GNUG__ | |
13 | #pragma implementation | |
14 | #pragma implementation "dcmemory.h" | |
15 | #endif | |
16 | ||
17 | // For compilers that support precompilation, includes "wx.h". | |
18 | #include "wx/wxprec.h" | |
19 | ||
20 | #ifdef __BORLANDC__ | |
21 | #pragma hdrstop | |
22 | #endif | |
23 | ||
24 | #ifndef WX_PRECOMP | |
25 | #endif | |
26 | ||
27 | #include "wx/dcmemory.h" | |
28 | ||
29 | #include <windows.h> | |
30 | ||
31 | #if !USE_SHARED_LIBRARY | |
32 | IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC) | |
33 | #endif | |
34 | ||
35 | /* | |
36 | * Memory DC | |
37 | * | |
38 | */ | |
39 | ||
40 | wxMemoryDC::wxMemoryDC(void) | |
41 | { | |
42 | m_hDC = (WXHDC) ::CreateCompatibleDC(NULL); | |
43 | m_ok = (m_hDC != 0); | |
1c089c47 | 44 | m_bOwnsDC = TRUE; |
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45 | |
46 | SetBrush(*wxWHITE_BRUSH); | |
47 | SetPen(*wxBLACK_PEN); | |
48 | } | |
49 | ||
50 | wxMemoryDC::wxMemoryDC(wxDC *old_dc) | |
51 | { | |
52 | old_dc->BeginDrawing(); | |
53 | ||
54 | m_hDC = (WXHDC) ::CreateCompatibleDC((HDC) old_dc->GetHDC()); | |
55 | m_ok = (m_hDC != 0); | |
56 | ||
57 | old_dc->EndDrawing(); | |
58 | ||
59 | SetBrush(*wxWHITE_BRUSH); | |
60 | SetPen(*wxBLACK_PEN); | |
61 | } | |
62 | ||
63 | wxMemoryDC::~wxMemoryDC(void) | |
64 | { | |
65 | } | |
66 | ||
67 | void wxMemoryDC::SelectObject(const wxBitmap& bitmap) | |
68 | { | |
69 | // Select old bitmap out of the device context | |
70 | if (m_oldBitmap) | |
71 | { | |
72 | ::SelectObject((HDC) m_hDC, (HBITMAP) m_oldBitmap); | |
73 | if (m_selectedBitmap.Ok()) | |
74 | { | |
75 | m_selectedBitmap.SetSelectedInto(NULL); | |
76 | m_selectedBitmap = wxNullBitmap; | |
77 | } | |
78 | } | |
79 | ||
80 | // Do own check for whether the bitmap is already selected into | |
81 | // a device context | |
82 | if (bitmap.GetSelectedInto() && (bitmap.GetSelectedInto() != this)) | |
83 | { | |
84 | wxFatalError("Error in wxMemoryDC::SelectObject\nBitmap is selected in another wxMemoryDC.\nDelete the first wxMemoryDC or use SelectObject(NULL)"); | |
85 | return; | |
86 | } | |
87 | ||
88 | m_selectedBitmap = bitmap; | |
89 | ||
90 | if (!m_selectedBitmap.Ok()) | |
91 | return; | |
92 | ||
93 | m_selectedBitmap.SetSelectedInto(this); | |
b2aef89b | 94 | #if WXDEBUG > 1 |
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95 | wxDebugMsg("wxMemoryDC::SelectObject: Selecting HBITMAP %X\n", m_selectedBitmap.GetHBITMAP()); |
96 | #endif | |
97 | HBITMAP bm = ::SelectObject((HDC) m_hDC, (HBITMAP) m_selectedBitmap.GetHBITMAP()); | |
98 | ||
99 | if (bm == ERROR) | |
100 | { | |
101 | wxFatalError("Error in wxMemoryDC::SelectObject\nBitmap may not be loaded, or may be selected in another wxMemoryDC.\nDelete the first wxMemoryDC to deselect bitmap."); | |
102 | } | |
103 | else if (!m_oldBitmap) | |
104 | m_oldBitmap = (WXHBITMAP) bm; | |
105 | } | |
106 | ||
107 | void wxMemoryDC::GetSize(int *width, int *height) const | |
108 | { | |
109 | if (!m_selectedBitmap.Ok()) | |
110 | { | |
111 | *width = 0; *height = 0; | |
112 | return; | |
113 | } | |
114 | *width = m_selectedBitmap.GetWidth(); | |
115 | *height = m_selectedBitmap.GetHeight(); | |
116 | } | |
117 |