preserve type when loaded image is rescaled, #11543

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

diff --git a/src/msw/imaglist.cpp b/src/msw/imaglist.cpp
index 7548695b8c45884ebbf9feb7c7bdfb3d7a16c3cf..4820d044b6114bf5c4eec55a4e19440e9bc98ebc 100644 (file)
--- a/src/msw/imaglist.cpp
+++ b/src/msw/imaglist.cpp
@@ -38,6 +38,8 @@
 #endif
 
 #include "wx/imaglist.h"
+#include "wx/dc.h"
+#include "wx/msw/dc.h"
 #include "wx/msw/private.h"
 
 // ----------------------------------------------------------------------------
@@ -74,17 +76,15 @@ bool wxImageList::Create(int width, int height, bool mask, int initial)
 {
     UINT flags = 0;
 
-    // set appropriate color depth
+    // as we want to be able to use 32bpp bitmaps in the image lists, we always
+    // use ILC_COLOR32, even if the display resolution is less -- the system
+    // will make the best effort to show the bitmap if we do this resulting in
+    // quite acceptable display while using a lower depth ILC_COLOR constant
+    // (e.g. ILC_COLOR16) shows completely broken bitmaps
 #ifdef __WXWINCE__
     flags |= ILC_COLOR;
 #else
-    int dd = wxDisplayDepth();
-
-    if (dd <= 4)       flags |= ILC_COLOR;   // 16 color
-    else if (dd <= 8)  flags |= ILC_COLOR8;  // 256 color
-    else if (dd <= 16) flags |= ILC_COLOR16; // 64k hi-color
-    else if (dd <= 24) flags |= ILC_COLOR24; // 16m truecolor
-    else if (dd <= 32) flags |= ILC_COLOR32; // 16m truecolor
+    flags |= ILC_COLOR32;
 #endif
 
     if ( mask )
@@ -117,7 +117,7 @@ wxImageList::~wxImageList()
 // Returns the number of images in the image list.
 int wxImageList::GetImageCount() const
 {
-    wxASSERT_MSG( m_hImageList, _T("invalid image list") );
+    wxASSERT_MSG( m_hImageList, wxT("invalid image list") );
 
     return ImageList_GetImageCount(GetHImageList());
 }
@@ -125,7 +125,7 @@ int wxImageList::GetImageCount() const
 // Returns the size (same for all images) of the images in the list
 bool wxImageList::GetSize(int WXUNUSED(index), int &width, int &height) const
 {
-    wxASSERT_MSG( m_hImageList, _T("invalid image list") );
+    wxASSERT_MSG( m_hImageList, wxT("invalid image list") );
 
     return ImageList_GetIconSize(GetHImageList(), &width, &height) != 0;
 }
@@ -241,8 +241,13 @@ bool wxImageList::Draw(int index,
                        int flags,
                        bool solidBackground)
 {
-    HDC hDC = GetHdcOf(dc);
-    wxCHECK_MSG( hDC, false, _T("invalid wxDC in wxImageList::Draw") );
+    wxDCImpl *impl = dc.GetImpl();
+    wxMSWDCImpl *msw_impl = wxDynamicCast( impl, wxMSWDCImpl );
+    if (!msw_impl)
+       return false;
+
+    HDC hDC = GetHdcOf(*msw_impl);
+    wxCHECK_MSG( hDC, false, wxT("invalid wxDC in wxImageList::Draw") );
 
     COLORREF clr = CLR_NONE;    // transparent by default
     if ( solidBackground )