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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: dcmemory.cpp
3 // Purpose: wxMemoryDC class
4 // Author: David Webster
5 // Modified by:
6 // Created: 10/14/99
7 // RCS-ID: $Id$
8 // Copyright: (c) David Webster
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // For compilers that support precompilation, includes "wx.h".
13 #include "wx/wxprec.h"
14
15 #ifndef WX_PRECOMP
16 #include "wx/utils.h"
17 #include "wx/app.h"
18 #include "wx/log.h"
19 #endif
20
21 #include "wx/os2/private.h"
22
23 #include "wx/dcmemory.h"
24
25 IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
26
27 /////////////////////////////////////////////////////////////////////////////
28 // Memory DC
29 /////////////////////////////////////////////////////////////////////////////
30
31 wxMemoryDC::wxMemoryDC(void)
32 {
33 CreateCompatible(NULL);
34 Init();
35 } // end of wxMemoryDC::wxMemoryDC
36
37 wxMemoryDC::wxMemoryDC(
38 wxDC* pOldDC
39 )
40 {
41 pOldDC->BeginDrawing();
42 CreateCompatible(pOldDC);
43 pOldDC->EndDrawing();
44 Init();
45 } // end of wxMemoryDC::wxMemoryDC
46
47 void wxMemoryDC::Init()
48 {
49 if (m_ok)
50 {
51 SetBrush(*wxWHITE_BRUSH);
52 SetPen(*wxBLACK_PEN);
53
54 // the background mode is only used for text background and is set in
55 // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
56 ::GpiSetBackMix( GetHPS(), BM_LEAVEALONE );
57 }
58 memset(&m_vRclPaint, 0, sizeof(m_vRclPaint));
59 } // end of wxMemoryDC::Init
60
61 bool wxMemoryDC::CreateCompatible(
62 wxDC* pDC
63 )
64 {
65 HDC hDC;
66 HPS hPS;
67 DEVOPENSTRUC vDOP = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
68 SIZEL vSize = {0, 0};
69
70 //
71 // Create a memory device context
72 //
73 hDC = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDOP, NULLHANDLE);
74 if (hDC != DEV_ERROR)
75 {
76 hPS = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
77 if (hPS != GPI_ERROR)
78 {
79 m_hPS = hPS;
80 m_hDC = hDC;
81 m_ok = TRUE;
82 m_bOwnsDC = TRUE;
83 //
84 // Set the wxWindows color table
85 //
86 ::GpiCreateLogColorTable( m_hPS
87 ,0L
88 ,LCOLF_CONSECRGB
89 ,0L
90 ,(LONG)wxTheColourDatabase->m_nSize
91 ,(PLONG)wxTheColourDatabase->m_palTable
92 );
93 ::GpiCreateLogColorTable( m_hPS
94 ,0L
95 ,LCOLF_RGB
96 ,0L
97 ,0L
98 ,NULL
99 );
100 }
101 else
102 {
103 m_hPS = NULLHANDLE;
104 m_hDC = NULLHANDLE;
105 m_ok = FALSE;
106 m_bOwnsDC = FALSE;
107 }
108 }
109 else
110 {
111 m_hPS = NULLHANDLE;
112 m_hDC = NULLHANDLE;
113 m_ok = FALSE;
114 m_bOwnsDC = FALSE;
115 }
116
117 //
118 // As we created the DC, we must delete it in the dtor
119 //
120 m_bOwnsDC = TRUE;
121 m_ok = m_hDC != 0;
122 return m_ok;
123 } // end of wxMemoryDC::CreateCompatible
124
125 void wxMemoryDC::SelectObject(
126 const wxBitmap& rBitmap
127 )
128 {
129 //
130 // Select old bitmap out of the device context
131 //
132 if (m_hOldBitmap)
133 {
134 ::GpiSetBitmap(m_hPS, NULLHANDLE);
135 if (m_vSelectedBitmap.Ok())
136 {
137 m_vSelectedBitmap.SetSelectedInto(NULL);
138 m_vSelectedBitmap = wxNullBitmap;
139 }
140 }
141
142 //
143 // Check for whether the bitmap is already selected into a device context
144 //
145 wxCHECK_RET( !rBitmap.GetSelectedInto() ||
146 (rBitmap.GetSelectedInto() == this),
147 wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
148
149 WXHBITMAP hBmp = rBitmap.GetHBITMAP();
150
151 if (!hBmp)
152 {
153 //
154 // Bmps drawn to are upside down, so flip it before committing
155 //
156 POINTL vPoint[4] = { 0, m_vSelectedBitmap.GetHeight(),
157 m_vSelectedBitmap.GetWidth(), 0,
158 0, 0, m_vSelectedBitmap.GetWidth(), m_vSelectedBitmap.GetHeight()
159 };
160
161
162 ::GpiBitBlt( m_hPS
163 ,m_hPS
164 ,4
165 ,vPoint
166 ,ROP_SRCCOPY
167 ,BBO_IGNORE
168 );
169 m_vSelectedBitmap.SetSelectedInto(NULL);
170 }
171 m_vSelectedBitmap = rBitmap;
172
173
174 if (!hBmp)
175 {
176
177 m_hOldBitmap = (WXHBITMAP)::GpiSetBitmap(m_hPS, NULLHANDLE);
178 return;
179 }
180 m_vSelectedBitmap.SetSelectedInto(this);
181 m_hOldBitmap = (WXHBITMAP)::GpiSetBitmap(m_hPS, (HBITMAP)hBmp);
182
183 if (m_hOldBitmap == HBM_ERROR)
184 {
185 wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
186 wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
187 }
188 } // end of wxMemoryDC::SelectObject
189
190 void wxMemoryDC::DoGetSize(
191 int* pWidth
192 , int* pHeight
193 ) const
194 {
195 if (!m_vSelectedBitmap.Ok())
196 {
197 *pWidth = 0;
198 *pHeight = 0;
199 return;
200 }
201 *pWidth = m_vSelectedBitmap.GetWidth();
202 *pHeight = m_vSelectedBitmap.GetHeight();
203 } // end of wxMemoryDC::DoGetSize
204