From 2acac1b415376271d108659df0d15741f53f4803 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 8 Oct 2006 17:18:12 +0000
Subject: [PATCH] avoid bitmap distortion when a non standard bitmap size is
 used (replaces patch 1477883)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41736 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/mac/carbon/bmpbuttn.cpp | 78 +++++++++++++++++++++++++++----------
 1 file changed, 57 insertions(+), 21 deletions(-)

diff --git a/src/mac/carbon/bmpbuttn.cpp b/src/mac/carbon/bmpbuttn.cpp
index f6badadfeb..2c149dd7d9 100644
--- a/src/mac/carbon/bmpbuttn.cpp
+++ b/src/mac/carbon/bmpbuttn.cpp
@@ -39,8 +39,6 @@ bool wxBitmapButton::Create( wxWindow *parent,
     if ( !wxControl::Create( parent, id, pos, size, style, validator, name ) )
         return false;
 
-    m_bmpNormal = bitmap;
-
     if ( style & wxBU_AUTODRAW )
     {
         m_marginX =
@@ -52,42 +50,80 @@ bool wxBitmapButton::Create( wxWindow *parent,
         m_marginY = 0;
     }
 
-    int width = size.x;
-    int height = size.y;
-
-    if ( bitmap.Ok() )
-    {
-        wxSize newSize = DoGetBestSize();
-        if ( width == wxDefaultCoord )
-            width = newSize.x;
-        if ( height == wxDefaultCoord )
-            height = newSize.y;
-    }
-
-    m_bmpNormal = bitmap;
-
     OSStatus err = noErr;
     ControlButtonContentInfo info;
 
     Rect bounds = wxMacGetBoundsForControl( this, pos, size );
     m_peer = new wxMacControl( this );
 
+    if ( bitmap.Ok() && !size.IsFullySpecified() )
+    {
+        // in Mac OS X the bitmap buttons can have only one of the few standard
+        // sizes and if they don't, the OS rescales them automatically
+        // resulting in really ugly images, so centre the image in a square of
+        // standard size instead
+
+        // the supported sizes, sorted in decreasng order
+        static const int stdSizes[] = { 128, 48, 32, 16, 0 };
+
+        const int width = bitmap.GetWidth();
+        const int height = bitmap.GetHeight();
+
+        int n;
+        for ( n = 0; n < (int)WXSIZEOF(stdSizes); n++ )
+        {
+            const int sizeStd = stdSizes[n];
+            if ( width > sizeStd || height > sizeStd )
+            {
+                // it will become -1 if the bitmap is larger than the biggest
+                // supported size, this is intentional
+                n--;
+
+                break;
+            }
+        }
+
+        if ( n != -1 )
+        {
+            const int sizeStd = stdSizes[n];
+            if ( width != sizeStd || height != sizeStd )
+            {
+                wxASSERT_MSG( width <= sizeStd && height <= sizeStd,
+                              _T("bitmap shouldn't be cropped") );
+
+                m_bmpNormal.Create(sizeStd, sizeStd);
+                wxMemoryDC dcMem;
+                dcMem.SelectObject(m_bmpNormal);
+                dcMem.Clear();
+
+                dcMem.DrawBitmap(bitmap,
+                                 (sizeStd - width)/2, (sizeStd-height)/2,
+                                 true);
+            }
+        }
+        //else: let the system rescale the bitmap
+    }
+
+    if ( !m_bmpNormal.Ok() )
+        m_bmpNormal = bitmap;
+
+
 #ifdef __WXMAC_OSX__
     if ( HasFlag( wxBORDER_NONE ) )
     {
         wxMacCreateBitmapButton( &info, m_bmpNormal, kControlContentIconRef );
         err = CreateIconControl(
-            MAC_WXHWND(parent->MacGetTopLevelWindowRef()),
-            &bounds, &info, false, m_peer->GetControlRefAddr() );
+                MAC_WXHWND(parent->MacGetTopLevelWindowRef()),
+                &bounds, &info, false, m_peer->GetControlRefAddr() );
     }
     else
 #endif
     {
         wxMacCreateBitmapButton( &info, m_bmpNormal );
         err = CreateBevelButtonControl(
-            MAC_WXHWND(parent->MacGetTopLevelWindowRef()), &bounds, CFSTR(""),
-            ((style & wxBU_AUTODRAW) ? kControlBevelButtonSmallBevel : kControlBevelButtonNormalBevel ),
-            kControlBehaviorOffsetContents, &info, 0, 0, 0, m_peer->GetControlRefAddr() );
+                MAC_WXHWND(parent->MacGetTopLevelWindowRef()), &bounds, CFSTR(""),
+                ((style & wxBU_AUTODRAW) ? kControlBevelButtonSmallBevel : kControlBevelButtonNormalBevel ),
+                kControlBehaviorOffsetContents, &info, 0, 0, 0, m_peer->GetControlRefAddr() );
     }
 
     verify_noerr( err );
-- 
2.45.2