| 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 | CreateCompatible(NULL); |
| 57 | |
| 58 | Init(); |
| 59 | } |
| 60 | |
| 61 | wxMemoryDC::wxMemoryDC(wxDC *dc) |
| 62 | { |
| 63 | wxCHECK_RET( dc, _T("NULL dc in wxMemoryDC ctor") ); |
| 64 | |
| 65 | dc->BeginDrawing(); |
| 66 | |
| 67 | CreateCompatible(dc); |
| 68 | |
| 69 | dc->EndDrawing(); |
| 70 | |
| 71 | Init(); |
| 72 | } |
| 73 | |
| 74 | void wxMemoryDC::Init() |
| 75 | { |
| 76 | if ( m_ok ) |
| 77 | { |
| 78 | SetBrush(*wxWHITE_BRUSH); |
| 79 | SetPen(*wxBLACK_PEN); |
| 80 | |
| 81 | // the background mode is only used for text background and is set in |
| 82 | // DrawText() to OPAQUE as required, otherwise always TRANSPARENT |
| 83 | ::SetBkMode( GetHdc(), TRANSPARENT ); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | bool wxMemoryDC::CreateCompatible(wxDC *dc) |
| 88 | { |
| 89 | m_hDC = (WXHDC)::CreateCompatibleDC(dc ? GetHdcOf(*dc) : NULL); |
| 90 | |
| 91 | // as we created the DC, we must delete it in the dtor |
| 92 | m_bOwnsDC = TRUE; |
| 93 | |
| 94 | m_ok = m_hDC != 0; |
| 95 | |
| 96 | return m_ok; |
| 97 | } |
| 98 | |
| 99 | void wxMemoryDC::SelectObject(const wxBitmap& bitmap) |
| 100 | { |
| 101 | // select old bitmap out of the device context |
| 102 | if ( m_oldBitmap ) |
| 103 | { |
| 104 | ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap); |
| 105 | if ( m_selectedBitmap.Ok() ) |
| 106 | { |
| 107 | m_selectedBitmap.SetSelectedInto(NULL); |
| 108 | m_selectedBitmap = wxNullBitmap; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | // check for whether the bitmap is already selected into a device context |
| 113 | wxCHECK_RET( !bitmap.GetSelectedInto() || |
| 114 | (bitmap.GetSelectedInto() == this), |
| 115 | wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") ); |
| 116 | |
| 117 | m_selectedBitmap = bitmap; |
| 118 | WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP(); |
| 119 | if ( !hBmp ) |
| 120 | return; |
| 121 | |
| 122 | m_selectedBitmap.SetSelectedInto(this); |
| 123 | hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp); |
| 124 | |
| 125 | if ( !hBmp ) |
| 126 | { |
| 127 | wxLogLastError(wxT("SelectObject(memDC, bitmap)")); |
| 128 | |
| 129 | wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC")); |
| 130 | } |
| 131 | else if ( !m_oldBitmap ) |
| 132 | { |
| 133 | m_oldBitmap = hBmp; |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | void wxMemoryDC::DoGetSize(int *width, int *height) const |
| 138 | { |
| 139 | if ( m_selectedBitmap.Ok() ) |
| 140 | { |
| 141 | *width = m_selectedBitmap.GetWidth(); |
| 142 | *height = m_selectedBitmap.GetHeight(); |
| 143 | } |
| 144 | else |
| 145 | { |
| 146 | *width = 0; |
| 147 | *height = 0; |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | // the rest of this file deals with drawing rectangles workaround, disabled by |
| 152 | // default |
| 153 | |
| 154 | #define wxUSE_MEMORY_DC_DRAW_RECTANGLE 0 |
| 155 | |
| 156 | #if wxUSE_MEMORY_DC_DRAW_RECTANGLE |
| 157 | |
| 158 | // For some reason, drawing a rectangle on a memory DC has problems. |
| 159 | // Use this substitute if we can. |
| 160 | static void wxDrawRectangle(wxDC& dc, wxCoord x, wxCoord y, wxCoord width, wxCoord height) |
| 161 | { |
| 162 | wxBrush brush(dc.GetBrush()); |
| 163 | wxPen pen(dc.GetPen()); |
| 164 | if (brush.Ok() && brush.GetStyle() != wxTRANSPARENT) |
| 165 | { |
| 166 | HBRUSH hBrush = (HBRUSH) brush.GetResourceHandle() ; |
| 167 | if (hBrush) |
| 168 | { |
| 169 | RECT rect; |
| 170 | rect.left = x; rect.top = y; |
| 171 | rect.right = x + width - 1; |
| 172 | rect.bottom = y + height - 1; |
| 173 | ::FillRect((HDC) dc.GetHDC(), &rect, hBrush); |
| 174 | } |
| 175 | } |
| 176 | width --; height --; |
| 177 | if (pen.Ok() && pen.GetStyle() != wxTRANSPARENT) |
| 178 | { |
| 179 | dc.DrawLine(x, y, x + width, y); |
| 180 | dc.DrawLine(x, y, x, y + height); |
| 181 | dc.DrawLine(x, y+height, x+width, y + height); |
| 182 | dc.DrawLine(x+width, y+height, x+width, y); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | #endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE |
| 187 | |
| 188 | void wxMemoryDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height) |
| 189 | { |
| 190 | // Set this to 1 to work around an apparent video driver bug |
| 191 | // (visible with e.g. 70x70 rectangle on a memory DC; see Drawing sample) |
| 192 | #if wxUSE_MEMORY_DC_DRAW_RECTANGLE |
| 193 | if (m_brush.Ok() && m_pen.Ok() && |
| 194 | (m_brush.GetStyle() == wxSOLID || m_brush.GetStyle() == wxTRANSPARENT) && |
| 195 | (m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT) && |
| 196 | (GetLogicalFunction() == wxCOPY)) |
| 197 | { |
| 198 | wxDrawRectangle(* this, x, y, width, height); |
| 199 | } |
| 200 | else |
| 201 | #endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE |
| 202 | { |
| 203 | wxDC::DoDrawRectangle(x, y, width, height); |
| 204 | } |
| 205 | } |
| 206 | |