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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 | // ============================================================================ | |
13 | // declarations | |
14 | // ============================================================================ | |
15 | ||
16 | // ---------------------------------------------------------------------------- | |
17 | // headers | |
18 | // ---------------------------------------------------------------------------- | |
19 | ||
20 | #ifdef __GNUG__ | |
21 | #pragma implementation "dcmemory.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/utils.h" | |
33 | #include "wx/log.h" | |
34 | #endif | |
35 | ||
36 | #include "wx/msw/private.h" | |
37 | ||
38 | #include "wx/dcmemory.h" | |
39 | ||
40 | // ---------------------------------------------------------------------------- | |
41 | // wxWin macros | |
42 | // ---------------------------------------------------------------------------- | |
43 | ||
44 | IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC) | |
45 | ||
46 | // ============================================================================ | |
47 | // implementation | |
48 | // ============================================================================ | |
49 | ||
50 | // ---------------------------------------------------------------------------- | |
51 | // wxMemoryDC | |
52 | // ---------------------------------------------------------------------------- | |
53 | ||
54 | wxMemoryDC::wxMemoryDC() | |
55 | { | |
56 | m_hDC = (WXHDC) ::CreateCompatibleDC((HDC) NULL); | |
57 | m_ok = (m_hDC != 0); | |
58 | m_bOwnsDC = TRUE; | |
59 | ||
60 | SetBrush(*wxWHITE_BRUSH); | |
61 | SetPen(*wxBLACK_PEN); | |
62 | ||
63 | // the background mode is only used for text background and is set in | |
64 | // DrawText() to OPAQUE as required, otherwise always TRANSPARENT | |
65 | ::SetBkMode( GetHdc(), TRANSPARENT ); | |
66 | } | |
67 | ||
68 | wxMemoryDC::wxMemoryDC(wxDC *old_dc) | |
69 | { | |
70 | old_dc->BeginDrawing(); | |
71 | ||
72 | m_hDC = (WXHDC) ::CreateCompatibleDC(GetHdcOf(*old_dc)); | |
73 | m_ok = (m_hDC != 0); | |
74 | ||
75 | old_dc->EndDrawing(); | |
76 | ||
77 | SetBrush(*wxWHITE_BRUSH); | |
78 | SetPen(*wxBLACK_PEN); | |
79 | ||
80 | // the background mode is only used for text background and is set in | |
81 | // DrawText() to OPAQUE as required, otherwise always TRANSPARENT | |
82 | ::SetBkMode( GetHdc(), TRANSPARENT ); | |
83 | } | |
84 | ||
85 | wxMemoryDC::~wxMemoryDC() | |
86 | { | |
87 | } | |
88 | ||
89 | void wxMemoryDC::SelectObject(const wxBitmap& bitmap) | |
90 | { | |
91 | // select old bitmap out of the device context | |
92 | if ( m_oldBitmap ) | |
93 | { | |
94 | ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap); | |
95 | if ( m_selectedBitmap.Ok() ) | |
96 | { | |
97 | m_selectedBitmap.SetSelectedInto(NULL); | |
98 | m_selectedBitmap = wxNullBitmap; | |
99 | } | |
100 | } | |
101 | ||
102 | // check for whether the bitmap is already selected into a device context | |
103 | wxCHECK_RET( !bitmap.GetSelectedInto() || | |
104 | (bitmap.GetSelectedInto() == this), | |
105 | wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") ); | |
106 | ||
107 | m_selectedBitmap = bitmap; | |
108 | WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP(); | |
109 | if ( !hBmp ) | |
110 | return; | |
111 | ||
112 | m_selectedBitmap.SetSelectedInto(this); | |
113 | hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp); | |
114 | ||
115 | if ( !hBmp ) | |
116 | { | |
117 | wxLogLastError(wxT("SelectObject(memDC, bitmap)")); | |
118 | ||
119 | wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC")); | |
120 | } | |
121 | else if ( !m_oldBitmap ) | |
122 | { | |
123 | m_oldBitmap = hBmp; | |
124 | } | |
125 | } | |
126 | ||
127 | void wxMemoryDC::DoGetSize(int *width, int *height) const | |
128 | { | |
129 | if ( m_selectedBitmap.Ok() ) | |
130 | { | |
131 | *width = m_selectedBitmap.GetWidth(); | |
132 | *height = m_selectedBitmap.GetHeight(); | |
133 | } | |
134 | else | |
135 | { | |
136 | *width = 0; | |
137 | *height = 0; | |
138 | } | |
139 | } | |
140 | ||
141 | // the rest of this file deals with drawing rectangles workaround, disabled by | |
142 | // default | |
143 | ||
144 | #define wxUSE_MEMORY_DC_DRAW_RECTANGLE 0 | |
145 | ||
146 | #if wxUSE_MEMORY_DC_DRAW_RECTANGLE | |
147 | ||
148 | // For some reason, drawing a rectangle on a memory DC has problems. | |
149 | // Use this substitute if we can. | |
150 | static void wxDrawRectangle(wxDC& dc, wxCoord x, wxCoord y, wxCoord width, wxCoord height) | |
151 | { | |
152 | wxBrush brush(dc.GetBrush()); | |
153 | wxPen pen(dc.GetPen()); | |
154 | if (brush.Ok() && brush.GetStyle() != wxTRANSPARENT) | |
155 | { | |
156 | HBRUSH hBrush = (HBRUSH) brush.GetResourceHandle() ; | |
157 | if (hBrush) | |
158 | { | |
159 | RECT rect; | |
160 | rect.left = x; rect.top = y; | |
161 | rect.right = x + width - 1; | |
162 | rect.bottom = y + height - 1; | |
163 | ::FillRect((HDC) dc.GetHDC(), &rect, hBrush); | |
164 | } | |
165 | } | |
166 | width --; height --; | |
167 | if (pen.Ok() && pen.GetStyle() != wxTRANSPARENT) | |
168 | { | |
169 | dc.DrawLine(x, y, x + width, y); | |
170 | dc.DrawLine(x, y, x, y + height); | |
171 | dc.DrawLine(x, y+height, x+width, y + height); | |
172 | dc.DrawLine(x+width, y+height, x+width, y); | |
173 | } | |
174 | } | |
175 | ||
176 | #endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE | |
177 | ||
178 | void wxMemoryDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) | |
179 | { | |
180 | // Set this to 1 to work around an apparent video driver bug | |
181 | // (visible with e.g. 70x70 rectangle on a memory DC; see Drawing sample) | |
182 | #if wxUSE_MEMORY_DC_DRAW_RECTANGLE | |
183 | if (m_brush.Ok() && m_pen.Ok() && | |
184 | (m_brush.GetStyle() == wxSOLID || m_brush.GetStyle() == wxTRANSPARENT) && | |
185 | (m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT) && | |
186 | (GetLogicalFunction() == wxCOPY)) | |
187 | { | |
188 | wxDrawRectangle(* this, x, y, width, height); | |
189 | } | |
190 | else | |
191 | #endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE | |
192 | { | |
193 | wxDC::DoDrawRectangle(x, y, width, height); | |
194 | } | |
195 | } | |
196 |