Ensure there is valid context for DrawRectangle

[wxWidgets.git] / src / msw / dc.cpp

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 962054ae85524e9a6cf76deb63fa74b2afdef09c..b828f025e1bcc2f417ee915aee16dee15dfb9fda 100644 (file)
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -51,6 +51,7 @@
 #include <string.h>
 
 #include "wx/msw/private/dc.h"
 #include <string.h>
 
 #include "wx/msw/private/dc.h"

+#include "wx/private/textmeasure.h"

 
 using namespace wxMSWImpl;
 
 
 using namespace wxMSWImpl;
 


@@ -83,7 +84,9 @@ IMPLEMENT_ABSTRACT_CLASS(wxMSWDCImpl, wxDCImpl)
 // constants
 // ---------------------------------------------------------------------------
 
 // constants
 // ---------------------------------------------------------------------------
 

-static const int VIEWPORT_EXTENT = 1024;
+// The device space in Win32 GDI measures 2^27*2^27 , so we use 2^27-1 as the
+// maximal possible view port extent.
+static const int VIEWPORT_EXTENT = 134217727;

 
 // ROPs which don't have standard names (see "Ternary Raster Operations" in the
 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)
 
 // ROPs which don't have standard names (see "Ternary Raster Operations" in the
 // MSDN docs for how this and other numbers in wxDC::Blit() are obtained)


@@ -146,6 +149,22 @@ wxAlphaBlend(HDC hdcDst, int xDst, int yDst,
 
 #endif // wxHAS_RAW_BITMAP
 
 
 #endif // wxHAS_RAW_BITMAP
 

+namespace wxMSW
+{
+
+// Wrappers for the dynamically loaded {Set,Get}Layout() functions. They work
+// in exactly the same way as the standard functions and return GDI_ERROR if
+// they're not actually available.
+DWORD GetLayout(HDC hdc);
+DWORD SetLayout(HDC hdc, DWORD dwLayout);
+
+// Create a compatible HDC and copy the layout of the source DC to it. This is
+// necessary in order to draw bitmaps (which are usually blitted from a
+// temporary compatible memory DC to the real target DC) using the same layout.
+HDC CreateCompatibleDCWithLayout(HDC hdc);
+
+} // namespace wxMSW
+

 // ----------------------------------------------------------------------------
 // private classes
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // private classes
 // ----------------------------------------------------------------------------


@@ -878,7 +897,7 @@ void wxMSWDCImpl::DoDrawPoint(wxCoord x, wxCoord y)
 }
 
 void wxMSWDCImpl::DoDrawPolygon(int n,
 }
 
 void wxMSWDCImpl::DoDrawPolygon(int n,

-                         wxPoint points[],
+                         const wxPoint points[],

                          wxCoord xoffset,
                          wxCoord yoffset,
                          wxPolygonFillMode WXUNUSED_IN_WINCE(fillStyle))
                          wxCoord xoffset,
                          wxCoord yoffset,
                          wxPolygonFillMode WXUNUSED_IN_WINCE(fillStyle))


@@ -926,8 +945,8 @@ void wxMSWDCImpl::DoDrawPolygon(int n,
 
 void
 wxMSWDCImpl::DoDrawPolyPolygon(int n,
 
 void
 wxMSWDCImpl::DoDrawPolyPolygon(int n,

-                        int count[],
-                        wxPoint points[],
+                        const int count[],
+                        const wxPoint points[],

                         wxCoord xoffset,
                         wxCoord yoffset,
                         wxPolygonFillMode fillStyle)
                         wxCoord xoffset,
                         wxCoord yoffset,
                         wxPolygonFillMode fillStyle)


@@ -979,7 +998,7 @@ wxMSWDCImpl::DoDrawPolyPolygon(int n,
   // __WXWINCE__
 }
 
   // __WXWINCE__
 }
 

-void wxMSWDCImpl::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
+void wxMSWDCImpl::DoDrawLines(int n, const wxPoint points[], wxCoord xoffset, wxCoord yoffset)

 {
     WXMICROWIN_CHECK_HDC
 
 {
     WXMICROWIN_CHECK_HDC
 


@@ -1323,7 +1342,7 @@ void wxMSWDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool
 #endif // wxUSE_SYSTEM_OPTIONS
         {
             HDC cdc = GetHdc();
 #endif // wxUSE_SYSTEM_OPTIONS
         {
             HDC cdc = GetHdc();

-            HDC hdcMem = ::CreateCompatibleDC(GetHdc());
+            HDC hdcMem = wxMSW::CreateCompatibleDCWithLayout(cdc);

             HGDIOBJ hOldBitmap = ::SelectObject(hdcMem, GetHbitmapOf(bmp));
 #if wxUSE_PALETTE
             wxPalette *pal = bmp.GetPalette();
             HGDIOBJ hOldBitmap = ::SelectObject(hdcMem, GetHbitmapOf(bmp));
 #if wxUSE_PALETTE
             wxPalette *pal = bmp.GetPalette();


@@ -1355,17 +1374,16 @@ void wxMSWDCImpl::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool
             // level
             wxMemoryDC memDC;
 
             // level
             wxMemoryDC memDC;
 

+            memDC.SetLayoutDirection(GetLayoutDirection());

             memDC.SelectObjectAsSource(bmp);
 
             GetOwner()->Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);
             memDC.SelectObjectAsSource(bmp);
 
             GetOwner()->Blit(x, y, width, height, &memDC, 0, 0, wxCOPY, useMask);

-
-            memDC.SelectObject(wxNullBitmap);

         }
     }
     else // no mask, just use BitBlt()
     {
         HDC cdc = GetHdc();
         }
     }
     else // no mask, just use BitBlt()
     {
         HDC cdc = GetHdc();

-        HDC memdc = ::CreateCompatibleDC( cdc );
+        HDC memdc = wxMSW::CreateCompatibleDCWithLayout( cdc );

         HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
 
         wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
         HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
 
         wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );


@@ -1855,111 +1873,44 @@ void wxMSWDCImpl::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y
     }
 #endif // __WXMICROWIN__
 
     }
 #endif // __WXMICROWIN__
 

-    HFONT hfontOld;
-    if ( font )
-    {
-        wxASSERT_MSG( font->IsOk(), wxT("invalid font in wxMSWDCImpl::GetTextExtent") );
-
-        hfontOld = (HFONT)::SelectObject(GetHdc(), GetHfontOf(*font));
-    }
-    else // don't change the font
-    {
-        hfontOld = 0;
-    }
-
-    SIZE sizeRect;
-    const size_t len = string.length();
-    if ( !::GetTextExtentPoint32(GetHdc(), string.wx_str(), len, &sizeRect) )
-    {
-        wxLogLastError(wxT("GetTextExtentPoint32()"));
-    }
-
-#if !defined(_WIN32_WCE) || (_WIN32_WCE >= 400)
-    // the result computed by GetTextExtentPoint32() may be too small as it
-    // accounts for under/overhang of the first/last character while we want
-    // just the bounding rect for this string so adjust the width as needed
-    // (using API not available in 2002 SDKs of WinCE)
-    if ( len > 0 )
-    {
-        ABC width;
-        const wxChar chFirst = *string.begin();
-        if ( ::GetCharABCWidths(GetHdc(), chFirst, chFirst, &width) )
-        {
-            if ( width.abcA < 0 )
-                sizeRect.cx -= width.abcA;
-
-            if ( len > 1 )
-            {
-                const wxChar chLast = *string.rbegin();
-                ::GetCharABCWidths(GetHdc(), chLast, chLast, &width);
-            }
-            //else: we already have the width of the last character
-
-            if ( width.abcC < 0 )
-                sizeRect.cx -= width.abcC;
-        }
-        //else: GetCharABCWidths() failed, not a TrueType font?
-    }
-#endif // !defined(_WIN32_WCE) || (_WIN32_WCE >= 400)
-
-    if (x)
-        *x = sizeRect.cx;
-    if (y)
-        *y = sizeRect.cy;
-
-    if ( descent || externalLeading )
-    {
-        DoGetFontMetrics(NULL, NULL, descent, NULL, externalLeading, NULL);
-    }
+    wxASSERT_MSG( !font || font->IsOk(), wxT("invalid font in wxMSWDCImpl::GetTextExtent") );

 
 

-    if ( hfontOld )
-    {
-        ::SelectObject(GetHdc(), hfontOld);
-    }
+    wxTextMeasure txm(GetOwner(), font);
+    txm.GetTextExtent(string, x, y, descent, externalLeading);

 }
 
 
 }
 
 

-// Each element of the array will be the width of the string up to and
-// including the coresoponding character in text.
-

 bool wxMSWDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 {
 bool wxMSWDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
 {

-    static int maxLenText = -1;
-    static int maxWidth = -1;
-    int fit = 0;
-    SIZE sz = {0,0};
-    int stlen = text.length();
+    wxTextMeasure txm(GetOwner(), NULL); // don't change the font
+    return txm.GetPartialTextExtents(text, widths, 1.0);
+}

 
 

-    if (maxLenText == -1)
-    {
-        // Win9x and WinNT+ have different limits
-        int version = wxGetOsVersion();
-        maxLenText = version == wxOS_WINDOWS_NT ? 65535 : 8192;
-        maxWidth =   version == wxOS_WINDOWS_NT ? INT_MAX : 32767;
-    }
+namespace
+{

 
 

-    widths.Empty();
-    widths.Add(0, stlen);  // fill the array with zeros
-    if (stlen == 0)
-        return true;
+void ApplyEffectiveScale(double scale, int sign, int *device, int *logical)
+{
+    // To reduce rounding errors as much as possible, we try to use the largest
+    // possible extent (2^27-1) for the device space but we must also avoid
+    // overflowing the int range i.e. ensure that logical extents are less than
+    // 2^31 in magnitude. So the minimal scale we can use is 1/16 as for
+    // anything smaller VIEWPORT_EXTENT/scale would overflow the int range.
+    static const double MIN_LOGICAL_SCALE = 1./16;

 
 

-    if (!::GetTextExtentExPoint(GetHdc(),
-                                text.c_str(),           // string to check
-                                wxMin(stlen, maxLenText),
-                                maxWidth,
-                                &fit,                   // [out] count of chars
-                                                        // that will fit
-                                &widths[0],             // array to fill
-                                &sz))
-    {
-        // API failed
-        wxLogLastError(wxT("GetTextExtentExPoint"));
-        return false;
+    double physExtent = VIEWPORT_EXTENT;
+    if ( scale < MIN_LOGICAL_SCALE )
+    {
+        physExtent *= scale/MIN_LOGICAL_SCALE;
+        scale = MIN_LOGICAL_SCALE;

     }
 
     }
 

-    return true;
+    *device = wxRound(physExtent);
+    *logical = sign*wxRound(VIEWPORT_EXTENT/scale);

 }
 
 }
 

+} // anonymous namespace
+

 void wxMSWDCImpl::RealizeScaleAndOrigin()
 {
     // although it may seem wasteful to always use MM_ANISOTROPIC here instead
 void wxMSWDCImpl::RealizeScaleAndOrigin()
 {
     // although it may seem wasteful to always use MM_ANISOTROPIC here instead


@@ -1970,34 +1921,13 @@ void wxMSWDCImpl::RealizeScaleAndOrigin()
 
     // wxWidgets API assumes that the coordinate space is "infinite" (i.e. only
     // limited by 2^32 range of the integer coordinates) but in MSW API we must
 
     // wxWidgets API assumes that the coordinate space is "infinite" (i.e. only
     // limited by 2^32 range of the integer coordinates) but in MSW API we must

-    // actually specify the extents that we use. So we more or less arbitrarily
-    // decide to use "base" VIEWPORT_EXTENT and adjust it depending on scale.
-    //
-    // To avoid rounding errors we prefer to multiply by the scale if it's > 1
-    // and to divide by it if it's < 1.
+    // actually specify the extents that we use so compute them here.
+

     int devExtX, devExtY,   // Viewport, i.e. device space, extents.
         logExtX, logExtY;   // Window, i.e. logical coordinate space, extents.
     int devExtX, devExtY,   // Viewport, i.e. device space, extents.
         logExtX, logExtY;   // Window, i.e. logical coordinate space, extents.

-    if ( m_scaleX >= 1 )
-    {
-        devExtX = wxRound(VIEWPORT_EXTENT*m_scaleX);
-        logExtX = m_signX*VIEWPORT_EXTENT;
-    }
-    else
-    {
-        devExtX = VIEWPORT_EXTENT;
-        logExtX = wxRound(m_signX*VIEWPORT_EXTENT/m_scaleX);
-    }

 
 

-    if ( m_scaleY >= 1 )
-    {
-        devExtY = wxRound(VIEWPORT_EXTENT*m_scaleY);
-        logExtY = m_signY*VIEWPORT_EXTENT;
-    }
-    else
-    {
-        devExtY = VIEWPORT_EXTENT;
-        logExtY = wxRound(m_signY*VIEWPORT_EXTENT/m_scaleY);
-    }
+    ApplyEffectiveScale(m_scaleX, m_signX, &devExtX, &logExtX);
+    ApplyEffectiveScale(m_scaleY, m_signY, &devExtY, &logExtY);

 
     ::SetViewportExtEx(GetHdc(), devExtX, devExtY, NULL);
     ::SetWindowExtEx(GetHdc(), logExtX, logExtY, NULL);
 
     ::SetViewportExtEx(GetHdc(), devExtX, devExtY, NULL);
     ::SetWindowExtEx(GetHdc(), logExtX, logExtY, NULL);


@@ -2311,7 +2241,8 @@ bool wxMSWDCImpl::DoStretchBlit(wxCoord xdest, wxCoord ydest,
         // than the wxWidgets fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
 #if wxUSE_SYSTEM_OPTIONS
         // than the wxWidgets fall-back implementation. So we need
         // to be able to switch this on and off at runtime.
 #if wxUSE_SYSTEM_OPTIONS

-        if (wxSystemOptions::GetOptionInt(wxT("no-maskblt")) == 0)
+        static bool s_maskBltAllowed = wxSystemOptions::GetOptionInt("no-maskblt") == 0;
+        if ( s_maskBltAllowed )

 #endif
         {
             if ( dstWidth == srcWidth && dstHeight == srcHeight )
 #endif
         {
             if ( dstWidth == srcWidth && dstHeight == srcHeight )


@@ -2351,8 +2282,8 @@ bool wxMSWDCImpl::DoStretchBlit(wxCoord xdest, wxCoord ydest,
             buffer_bmap = (HBITMAP) bitmapCacheEntry->m_bitmap;
 #else // !wxUSE_DC_CACHEING
             // create a temp buffer bitmap and DCs to access it and the mask
             buffer_bmap = (HBITMAP) bitmapCacheEntry->m_bitmap;
 #else // !wxUSE_DC_CACHEING
             // create a temp buffer bitmap and DCs to access it and the mask

-            dc_mask = ::CreateCompatibleDC(hdcSrc);
-            dc_buffer = ::CreateCompatibleDC(GetHdc());
+            dc_mask = wxMSW::CreateCompatibleDCWithLayout(hdcSrc);
+            dc_buffer = wxMSW::CreateCompatibleDCWithLayout(GetHdc());

             buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), dstWidth, dstHeight);
 #endif // wxUSE_DC_CACHEING/!wxUSE_DC_CACHEING
             HGDIOBJ hOldMaskBitmap = ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());
             buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), dstWidth, dstHeight);
 #endif // wxUSE_DC_CACHEING/!wxUSE_DC_CACHEING
             HGDIOBJ hOldMaskBitmap = ::SelectObject(dc_mask, (HBITMAP) mask->GetMaskBitmap());


@@ -2435,6 +2366,17 @@ bool wxMSWDCImpl::DoStretchBlit(wxCoord xdest, wxCoord ydest,
             {
                 SET_STRETCH_BLT_MODE(GetHdc());
 
             {
                 SET_STRETCH_BLT_MODE(GetHdc());
 

+                // Unlike all the other functions used here (i.e. AlphaBlt(),
+                // MaskBlt(), BitBlt() and StretchBlt()), StretchDIBits() does
+                // not take into account the source DC logical coordinates
+                // automatically as it doesn't even work with the source HDC.
+                // So do this manually to ensure that the coordinates are
+                // interpreted in the same way here as in all the other cases.
+                xsrc = source->LogicalToDeviceX(xsrc);
+                ysrc = source->LogicalToDeviceY(ysrc);
+                srcWidth = source->LogicalToDeviceXRel(srcWidth);
+                srcHeight = source->LogicalToDeviceYRel(srcHeight);
+

                 // Figure out what co-ordinate system we're supposed to specify
                 // ysrc in.
                 const LONG hDIB = ds.dsBmih.biHeight;
                 // Figure out what co-ordinate system we're supposed to specify
                 // ysrc in.
                 const LONG hDIB = ds.dsBmih.biHeight;


@@ -2654,7 +2596,7 @@ wxDCCacheEntry* wxMSWDCImpl::FindDCInCache(wxDCCacheEntry* notThis, WXHDC dc)
 
         node = node->GetNext();
     }
 
         node = node->GetNext();
     }

-    WXHDC hDC = (WXHDC) ::CreateCompatibleDC((HDC) dc);
+    WXHDC hDC = (WXHDC) wxMSW::CreateCompatibleDCWithLayout((HDC) dc);

     if ( !hDC)
     {
         wxLogLastError(wxT("CreateCompatibleDC"));
     if ( !hDC)
     {
         wxLogLastError(wxT("CreateCompatibleDC"));


@@ -2886,20 +2828,47 @@ void wxMSWDCImpl::DoGradientFillLinear (const wxRect& rect,
 
 #if wxUSE_DYNLIB_CLASS
 
 
 #if wxUSE_DYNLIB_CLASS
 

-static DWORD wxGetDCLayout(HDC hdc)
+namespace wxMSW
+{
+
+DWORD GetLayout(HDC hdc)

 {
     typedef DWORD (WINAPI *GetLayout_t)(HDC);
     static GetLayout_t
         wxDL_INIT_FUNC(s_pfn, GetLayout, wxDynamicLibrary(wxT("gdi32.dll")));
 
 {
     typedef DWORD (WINAPI *GetLayout_t)(HDC);
     static GetLayout_t
         wxDL_INIT_FUNC(s_pfn, GetLayout, wxDynamicLibrary(wxT("gdi32.dll")));
 

-    return s_pfnGetLayout ? s_pfnGetLayout(hdc) : (DWORD)-1;
+    return s_pfnGetLayout ? s_pfnGetLayout(hdc) : GDI_ERROR;

 }
 
 }
 

+DWORD SetLayout(HDC hdc, DWORD dwLayout)
+{
+    typedef DWORD (WINAPI *SetLayout_t)(HDC, DWORD);
+    static SetLayout_t
+        wxDL_INIT_FUNC(s_pfn, SetLayout, wxDynamicLibrary(wxT("gdi32.dll")));
+
+    return s_pfnSetLayout ? s_pfnSetLayout(hdc, dwLayout) : GDI_ERROR;
+}
+
+HDC CreateCompatibleDCWithLayout(HDC hdc)
+{
+    HDC hdcNew = ::CreateCompatibleDC(hdc);
+    if ( hdcNew )
+    {
+        DWORD dwLayout = wxMSW::GetLayout(hdc);
+        if ( dwLayout != GDI_ERROR )
+            wxMSW::SetLayout(hdcNew, dwLayout);
+    }
+
+    return hdcNew;
+}
+
+} // namespace wxMSW
+

 wxLayoutDirection wxMSWDCImpl::GetLayoutDirection() const
 {
 wxLayoutDirection wxMSWDCImpl::GetLayoutDirection() const
 {

-    DWORD layout = wxGetDCLayout(GetHdc());
+    DWORD layout = wxMSW::GetLayout(GetHdc());

 
 

-    if ( layout == (DWORD)-1 )
+    if ( layout == GDI_ERROR )

         return wxLayout_Default;
 
     return layout & LAYOUT_RTL ? wxLayout_RightToLeft : wxLayout_LeftToRight;
         return wxLayout_Default;
 
     return layout & LAYOUT_RTL ? wxLayout_RightToLeft : wxLayout_LeftToRight;


@@ -2907,12 +2876,6 @@ wxLayoutDirection wxMSWDCImpl::GetLayoutDirection() const
 
 void wxMSWDCImpl::SetLayoutDirection(wxLayoutDirection dir)
 {
 
 void wxMSWDCImpl::SetLayoutDirection(wxLayoutDirection dir)
 {

-    typedef DWORD (WINAPI *SetLayout_t)(HDC, DWORD);
-    static SetLayout_t
-        wxDL_INIT_FUNC(s_pfn, SetLayout, wxDynamicLibrary(wxT("gdi32.dll")));
-    if ( !s_pfnSetLayout )
-        return;
-

     if ( dir == wxLayout_Default )
     {
         dir = wxTheApp->GetLayoutDirection();
     if ( dir == wxLayout_Default )
     {
         dir = wxTheApp->GetLayoutDirection();


@@ -2920,17 +2883,41 @@ void wxMSWDCImpl::SetLayoutDirection(wxLayoutDirection dir)
             return;
     }
 
             return;
     }
 

-    DWORD layout = wxGetDCLayout(GetHdc());
+    DWORD layout = wxMSW::GetLayout(GetHdc());
+    if ( layout == GDI_ERROR )
+        return;
+

     if ( dir == wxLayout_RightToLeft )
         layout |= LAYOUT_RTL;
     else
         layout &= ~LAYOUT_RTL;
 
     if ( dir == wxLayout_RightToLeft )
         layout |= LAYOUT_RTL;
     else
         layout &= ~LAYOUT_RTL;
 

-    s_pfnSetLayout(GetHdc(), layout);
+    wxMSW::SetLayout(GetHdc(), layout);

 }
 
 #else // !wxUSE_DYNLIB_CLASS
 
 }
 
 #else // !wxUSE_DYNLIB_CLASS
 

+// Provide stubs to avoid ifdefs in the code using these functions.
+namespace wxMSW
+{
+
+DWORD GetLayout(HDC WXUNUSED(hdc))
+{
+    return GDI_ERROR;
+}
+
+DWORD SetLayout(HDC WXUNUSED(hdc), DWORD WXUNUSED(dwLayout))
+{
+    return GDI_ERROR;
+}
+
+HDC CreateCompatibleDCWithLayout(HDC hdc)
+{
+    return ::CreateCompatibleDC(hdc);
+}
+
+} // namespace wxMSW
+

 // we can't provide RTL support without dynamic loading, so stub it out
 wxLayoutDirection wxMSWDCImpl::GetLayoutDirection() const
 {
 // we can't provide RTL support without dynamic loading, so stub it out
 wxLayoutDirection wxMSWDCImpl::GetLayoutDirection() const
 {