avoid unnecessary heap allocation of BITMAPINFO struct

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55377 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/src/msw/dib.cpp b/src/msw/dib.cpp
index 3acfa95d2607bc07f0873e835359632ea8763ce4..35ddb6d72fe3b33bb76fd1c77b933ba3ba50b428 100644 (file)
--- a/src/msw/dib.cpp
+++ b/src/msw/dib.cpp
@@ -96,39 +96,33 @@ bool wxDIB::Create(int width, int height, int depth)
         depth = 24;
 
     // allocate memory for bitmap structures
-    static const int sizeHeader = sizeof(BITMAPINFOHEADER);
+    BITMAPINFO info;
+    wxZeroMemory(info);
 
-    BITMAPINFO *info = (BITMAPINFO *)malloc(sizeHeader);
-    wxCHECK_MSG( info, false, _T("malloc(BITMAPINFO) failed") );
-
-    memset(info, 0, sizeHeader);
-
-    info->bmiHeader.biSize = sizeHeader;
-    info->bmiHeader.biWidth = width;
+    info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+    info.bmiHeader.biWidth = width;
 
     // we use positive height here which corresponds to a DIB with normal, i.e.
     // bottom to top, order -- normally using negative height (which means
     // reversed for MS and hence natural for all the normal people top to
     // bottom line scan order) could be used to avoid the need for the image
     // reversal in Create(image) but this doesn't work under NT, only Win9x!
-    info->bmiHeader.biHeight = height;
+    info.bmiHeader.biHeight = height;
 
-    info->bmiHeader.biPlanes = 1;
-    info->bmiHeader.biBitCount = (WORD)depth;
-    info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
+    info.bmiHeader.biPlanes = 1;
+    info.bmiHeader.biBitCount = (WORD)depth;
+    info.bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
 
     m_handle = ::CreateDIBSection
                  (
                     0,              // hdc (unused with DIB_RGB_COLORS)
-                    info,           // bitmap description
+                    &info,          // bitmap description
                     DIB_RGB_COLORS, // use RGB, not palette
                     &m_data,        // [out] DIB bits
                     NULL,           // don't use file mapping
                     0               // file mapping offset (not used here)
                  );
 
-    free(info);
-
     if ( !m_handle )
     {
         wxLogLastError(wxT("CreateDIBSection"));