// Created: 01/02/97
// RCS-ID: $Id$
// Copyright: (c) Julian Smart and Markus Holzem
-// Licence: wxWindows licence
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
#ifdef __GNUG__
-#pragma implementation "dcmemory.h"
+ #pragma implementation "dcmemory.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
#ifndef WX_PRECOMP
-#include "wx/utils.h"
+ #include "wx/utils.h"
+ #include "wx/log.h"
#endif
+#include "wx/msw/private.h"
+
#include "wx/dcmemory.h"
-#include <windows.h>
-#include "wx/msw/winundef.h"
+// ----------------------------------------------------------------------------
+// wxWin macros
+// ----------------------------------------------------------------------------
-#if !USE_SHARED_LIBRARY
IMPLEMENT_DYNAMIC_CLASS(wxMemoryDC, wxDC)
-#endif
-/*
- * Memory DC
- *
- */
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxMemoryDC
+// ----------------------------------------------------------------------------
-wxMemoryDC::wxMemoryDC(void)
+wxMemoryDC::wxMemoryDC()
{
- m_hDC = (WXHDC) ::CreateCompatibleDC((HDC) NULL);
- m_ok = (m_hDC != 0);
- m_bOwnsDC = TRUE;
+ CreateCompatible(NULL);
- SetBrush(*wxWHITE_BRUSH);
- SetPen(*wxBLACK_PEN);
+ Init();
}
-wxMemoryDC::wxMemoryDC(wxDC *old_dc)
+wxMemoryDC::wxMemoryDC(wxDC *dc)
{
- old_dc->BeginDrawing();
+ wxCHECK_RET( dc, _T("NULL dc in wxMemoryDC ctor") );
+
+ dc->BeginDrawing();
- m_hDC = (WXHDC) ::CreateCompatibleDC((HDC) old_dc->GetHDC());
- m_ok = (m_hDC != 0);
+ CreateCompatible(dc);
- old_dc->EndDrawing();
+ dc->EndDrawing();
- SetBrush(*wxWHITE_BRUSH);
- SetPen(*wxBLACK_PEN);
+ Init();
}
-wxMemoryDC::~wxMemoryDC(void)
+void wxMemoryDC::Init()
{
+ if ( m_ok )
+ {
+ SetBrush(*wxWHITE_BRUSH);
+ SetPen(*wxBLACK_PEN);
+
+ // the background mode is only used for text background and is set in
+ // DrawText() to OPAQUE as required, otherwise always TRANSPARENT
+ ::SetBkMode( GetHdc(), TRANSPARENT );
+ }
+}
+
+bool wxMemoryDC::CreateCompatible(wxDC *dc)
+{
+ m_hDC = (WXHDC)::CreateCompatibleDC(dc ? GetHdcOf(*dc) : NULL);
+
+ // as we created the DC, we must delete it in the dtor
+ m_bOwnsDC = TRUE;
+
+ m_ok = m_hDC != 0;
+
+ return m_ok;
}
void wxMemoryDC::SelectObject(const wxBitmap& bitmap)
{
- // Select old bitmap out of the device context
- if (m_oldBitmap)
- {
- ::SelectObject((HDC) m_hDC, (HBITMAP) m_oldBitmap);
- if (m_selectedBitmap.Ok())
+ // select old bitmap out of the device context
+ if ( m_oldBitmap )
+ {
+ ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap);
+ if ( m_selectedBitmap.Ok() )
+ {
+ m_selectedBitmap.SetSelectedInto(NULL);
+ m_selectedBitmap = wxNullBitmap;
+ }
+ }
+
+ // check for whether the bitmap is already selected into a device context
+ wxCHECK_RET( !bitmap.GetSelectedInto() ||
+ (bitmap.GetSelectedInto() == this),
+ wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
+
+ m_selectedBitmap = bitmap;
+ WXHBITMAP hBmp = m_selectedBitmap.GetHBITMAP();
+ if ( !hBmp )
+ return;
+
+ m_selectedBitmap.SetSelectedInto(this);
+ hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp);
+
+ if ( !hBmp )
+ {
+ wxLogLastError(wxT("SelectObject(memDC, bitmap)"));
+
+ wxFAIL_MSG(wxT("Couldn't select a bitmap into wxMemoryDC"));
+ }
+ else if ( !m_oldBitmap )
{
- m_selectedBitmap.SetSelectedInto(NULL);
- m_selectedBitmap = wxNullBitmap;
+ m_oldBitmap = hBmp;
}
- }
-
- // Do own check for whether the bitmap is already selected into
- // a device context
- if (bitmap.GetSelectedInto() && (bitmap.GetSelectedInto() != this))
- {
- wxFatalError("Error in wxMemoryDC::SelectObject\nBitmap is selected in another wxMemoryDC.\nDelete the first wxMemoryDC or use SelectObject(NULL)");
- return;
- }
-
- // Check if the bitmap has the correct depth for this device context
-// if (bitmap.Ok() && (bitmap.GetDepth() != GetDepth()))
- // JACS 11/12/98: disabling this since the Forty Thieves sample
- // shows this not working properly. In fact, if loading from a resource,
- // the depth should become the screen depth, so why was it being called?
-// if (0)
-// {
-// // Make a new bitmap that has the correct depth.
-// wxBitmap newBitmap = bitmap.GetBitmapForDC(* this);
-//
-// m_selectedBitmap = newBitmap ;
-// }
-// else
-// {
- m_selectedBitmap = bitmap;
-// }
-
- if (!m_selectedBitmap.Ok())
- return;
-
- m_selectedBitmap.SetSelectedInto(this);
- HBITMAP bm = (HBITMAP) ::SelectObject((HDC) m_hDC, (HBITMAP) m_selectedBitmap.GetHBITMAP());
-
- if (bm == ERROR)
- {
- wxFatalError("Error in wxMemoryDC::SelectObject\nBitmap may not be loaded, or may be selected in another wxMemoryDC.\nDelete the first wxMemoryDC to deselect bitmap.");
- }
- else if (!m_oldBitmap)
- m_oldBitmap = (WXHBITMAP) bm;
}
void wxMemoryDC::DoGetSize(int *width, int *height) const
{
- if (!m_selectedBitmap.Ok())
- {
- *width = 0; *height = 0;
- return;
- }
- *width = m_selectedBitmap.GetWidth();
- *height = m_selectedBitmap.GetHeight();
+ if ( m_selectedBitmap.Ok() )
+ {
+ *width = m_selectedBitmap.GetWidth();
+ *height = m_selectedBitmap.GetHeight();
+ }
+ else
+ {
+ *width = 0;
+ *height = 0;
+ }
+}
+
+// the rest of this file deals with drawing rectangles workaround, disabled by
+// default
+
+#define wxUSE_MEMORY_DC_DRAW_RECTANGLE 0
+
+#if wxUSE_MEMORY_DC_DRAW_RECTANGLE
+
+// For some reason, drawing a rectangle on a memory DC has problems.
+// Use this substitute if we can.
+static void wxDrawRectangle(wxDC& dc, wxCoord x, wxCoord y, wxCoord width, wxCoord height)
+{
+ wxBrush brush(dc.GetBrush());
+ wxPen pen(dc.GetPen());
+ if (brush.Ok() && brush.GetStyle() != wxTRANSPARENT)
+ {
+ HBRUSH hBrush = (HBRUSH) brush.GetResourceHandle() ;
+ if (hBrush)
+ {
+ RECT rect;
+ rect.left = x; rect.top = y;
+ rect.right = x + width - 1;
+ rect.bottom = y + height - 1;
+ ::FillRect((HDC) dc.GetHDC(), &rect, hBrush);
+ }
+ }
+ width --; height --;
+ if (pen.Ok() && pen.GetStyle() != wxTRANSPARENT)
+ {
+ dc.DrawLine(x, y, x + width, y);
+ dc.DrawLine(x, y, x, y + height);
+ dc.DrawLine(x, y+height, x+width, y + height);
+ dc.DrawLine(x+width, y+height, x+width, y);
+ }
+}
+
+#endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
+
+void wxMemoryDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
+{
+ // Set this to 1 to work around an apparent video driver bug
+ // (visible with e.g. 70x70 rectangle on a memory DC; see Drawing sample)
+#if wxUSE_MEMORY_DC_DRAW_RECTANGLE
+ if (m_brush.Ok() && m_pen.Ok() &&
+ (m_brush.GetStyle() == wxSOLID || m_brush.GetStyle() == wxTRANSPARENT) &&
+ (m_pen.GetStyle() == wxSOLID || m_pen.GetStyle() == wxTRANSPARENT) &&
+ (GetLogicalFunction() == wxCOPY))
+ {
+ wxDrawRectangle(* this, x, y, width, height);
+ }
+ else
+#endif // wxUSE_MEMORY_DC_DRAW_RECTANGLE
+ {
+ wxDC::DoDrawRectangle(x, y, width, height);
+ }
}
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