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[wxWidgets.git] / src / msw / dcmemory.cpp
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2bda0e17 1/////////////////////////////////////////////////////////////////////////////
f38924e8 2// Name: src/msw/dcmemory.cpp
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3// Purpose: wxMemoryDC class
4// Author: Julian Smart
5// Modified by:
6// Created: 01/02/97
7// RCS-ID: $Id$
6c9a19aa 8// Copyright: (c) Julian Smart
65571936 9// Licence: wxWindows licence
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10/////////////////////////////////////////////////////////////////////////////
11
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12// ============================================================================
13// declarations
14// ============================================================================
15
16// ----------------------------------------------------------------------------
17// headers
18// ----------------------------------------------------------------------------
19
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20// For compilers that support precompilation, includes "wx.h".
21#include "wx/wxprec.h"
22
23#ifdef __BORLANDC__
d59ceba5 24 #pragma hdrstop
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25#endif
26
f38924e8 27#include "wx/dcmemory.h"
888dde65 28#include "wx/msw/dcmemory.h"
f38924e8 29
2bda0e17 30#ifndef WX_PRECOMP
d59ceba5 31 #include "wx/utils.h"
3f1c6a14 32 #include "wx/log.h"
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33#endif
34
c45a644e 35#include "wx/msw/private.h"
2bda0e17 36
d59ceba5 37// ----------------------------------------------------------------------------
888dde65 38// wxMemoryDCImpl
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39// ----------------------------------------------------------------------------
40
888dde65 41IMPLEMENT_ABSTRACT_CLASS(wxMemoryDCImpl, wxMSWDCImpl)
2bda0e17 42
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43wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner )
44 : wxMSWDCImpl( owner )
45{
46 CreateCompatible(NULL);
47 Init();
48}
2bda0e17 49
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50wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxBitmap& bitmap )
51 : wxMSWDCImpl( owner )
52{
53 CreateCompatible(NULL);
54 Init();
55 DoSelect(bitmap);
56}
2bda0e17 57
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58wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxDC *dc )
59 : wxMSWDCImpl( owner )
2bda0e17 60{
7ba4fbeb 61 wxCHECK_RET( dc, _T("NULL dc in wxMemoryDC ctor") );
2bda0e17 62
7ba4fbeb 63 CreateCompatible(dc);
2bda0e17 64
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65 Init();
66}
67
888dde65 68void wxMemoryDCImpl::Init()
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69{
70 if ( m_ok )
71 {
72 SetBrush(*wxWHITE_BRUSH);
73 SetPen(*wxBLACK_PEN);
74
75 // the background mode is only used for text background and is set in
76 // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
77 ::SetBkMode( GetHdc(), TRANSPARENT );
78 }
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79}
80
888dde65 81bool wxMemoryDCImpl::CreateCompatible(wxDC *dc)
2bda0e17 82{
19a1d9ee 83 wxDCImpl *impl = dc ? dc->GetImpl() : NULL ;
888dde65 84 wxMSWDCImpl *msw_impl = wxDynamicCast( impl, wxMSWDCImpl );
19a1d9ee 85 if ( dc && !msw_impl)
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86 {
87 m_ok = false;
88 return false;
89 }
90
91 m_hDC = (WXHDC)::CreateCompatibleDC(dc ? GetHdcOf(*msw_impl) : NULL);
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92
93 // as we created the DC, we must delete it in the dtor
d71cc120 94 m_bOwnsDC = true;
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95
96 m_ok = m_hDC != 0;
97
98 return m_ok;
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99}
100
888dde65 101void wxMemoryDCImpl::DoSelect( const wxBitmap& bitmap )
2bda0e17 102{
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103 // select old bitmap out of the device context
104 if ( m_oldBitmap )
2bda0e17 105 {
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106 ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap);
107 if ( m_selectedBitmap.Ok() )
108 {
3ca22d5e 109#ifdef __WXDEBUG__
d59ceba5 110 m_selectedBitmap.SetSelectedInto(NULL);
3ca22d5e 111#endif
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112 m_selectedBitmap = wxNullBitmap;
113 }
114 }
115
116 // check for whether the bitmap is already selected into a device context
336b8a42 117 wxASSERT_MSG( !bitmap.GetSelectedInto() ||
196fc5f2 118 (bitmap.GetSelectedInto() == GetOwner()),
336b8a42 119 wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
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120
121 m_selectedBitmap = bitmap;
122 WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP();
123 if ( !hBmp )
124 return;
125
3ca22d5e 126#ifdef __WXDEBUG__
196fc5f2 127 m_selectedBitmap.SetSelectedInto(GetOwner());
3ca22d5e 128#endif
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129 hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp);
130
131 if ( !hBmp )
132 {
f6bcfd97 133 wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
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134
135 wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
136 }
137 else if ( !m_oldBitmap )
138 {
139 m_oldBitmap = hBmp;
2bda0e17 140 }
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141}
142
888dde65 143void wxMemoryDCImpl::DoGetSize(int *width, int *height) const
2bda0e17 144{
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145 if ( m_selectedBitmap.Ok() )
146 {
147 *width = m_selectedBitmap.GetWidth();
148 *height = m_selectedBitmap.GetHeight();
149 }
150 else
151 {
152 *width = 0;
153 *height = 0;
154 }
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155}
156
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157// the rest of this file deals with drawing rectangles workaround, disabled by
158// default
159
160#define wxUSE_MEMORY_DC_DRAW_RECTANGLE 0
161
162#if wxUSE_MEMORY_DC_DRAW_RECTANGLE
163
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164// For some reason, drawing a rectangle on a memory DC has problems.
165// Use this substitute if we can.
166static void wxDrawRectangle(wxDC& dc, wxCoord x, wxCoord y, wxCoord width, wxCoord height)
167{
168 wxBrush brush(dc.GetBrush());
169 wxPen pen(dc.GetPen());
170 if (brush.Ok() && brush.GetStyle() != wxTRANSPARENT)
171 {
172 HBRUSH hBrush = (HBRUSH) brush.GetResourceHandle() ;
173 if (hBrush)
174 {
175 RECT rect;
176 rect.left = x; rect.top = y;
177 rect.right = x + width - 1;
178 rect.bottom = y + height - 1;
179 ::FillRect((HDC) dc.GetHDC(), &rect, hBrush);
180 }
181 }
182 width --; height --;
183 if (pen.Ok() && pen.GetStyle() != wxTRANSPARENT)
184 {
185 dc.DrawLine(x, y, x + width, y);
186 dc.DrawLine(x, y, x, y + height);
187 dc.DrawLine(x, y+height, x+width, y + height);
188 dc.DrawLine(x+width, y+height, x+width, y);
189 }
190}
191
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192#endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
193
888dde65 194void wxMemoryDCImpl::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
d6f0a4b3 195{
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196 // Set this to 1 to work around an apparent video driver bug
197 // (visible with e.g. 70x70 rectangle on a memory DC; see Drawing sample)
983a3844 198#if wxUSE_MEMORY_DC_DRAW_RECTANGLE
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199 if (m_brush.Ok() && m_pen.Ok() &&
200 (m_brush.GetStyle() == wxSOLID || m_brush.GetStyle() == wxTRANSPARENT) &&
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201 (m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT) &&
202 (GetLogicalFunction() == wxCOPY))
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203 {
204 wxDrawRectangle(* this, x, y, width, height);
205 }
206 else
983a3844 207#endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
d6f0a4b3 208 {
888dde65 209 wxMSWDCImpl::DoDrawRectangle(x, y, width, height);
d6f0a4b3 210 }
d6f0a4b3 211}