#include <memory.h>
#endif
-#ifdef __GNUWIN32_OLD__
- #include "wx/msw/gnuwin32/extra.h"
-#endif
-
#include "wx/image.h"
#include "wx/msw/dib.h"
{
// only 1, 4 and 8bpp bitmaps use palettes (well, they could be used with
// 24bpp ones too but we don't support this as I think it's quite uncommon)
- return bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0;
+ return (WORD)(bitsPerPixel <= 8 ? 1 << bitsPerPixel : 0);
}
// wrapper around ::GetObject() for DIB sections
info->bmiHeader.biHeight = height;
info->bmiHeader.biPlanes = 1;
- info->bmiHeader.biBitCount = depth;
+ info->bmiHeader.biBitCount = (WORD)depth;
info->bmiHeader.biSizeImage = GetLineSize(width, depth)*height;
m_handle = ::CreateDIBSection
{
wxCHECK_MSG( bmp.Ok(), false, _T("wxDIB::Create(): invalid bitmap") );
+ if ( !Create(GetHbitmapOf(bmp)) )
+ return false;
+
+ m_hasAlpha = bmp.HasAlpha();
+
+ return true;
+}
+
+bool wxDIB::Create(HBITMAP hbmp)
+{
// this bitmap could already be a DIB section in which case we don't need
// to convert it to DIB
- HBITMAP hbmp = GetHbitmapOf(bmp);
-
DIBSECTION ds;
if ( GetDIBSection(hbmp, &ds) )
{
}
else // no, it's a DDB -- convert it to DIB
{
- const int w = bmp.GetWidth();
- const int h = bmp.GetHeight();
- int d = bmp.GetDepth();
+ // prepare all the info we need
+ BITMAP bm;
+ if ( !::GetObject(hbmp, sizeof(bm), &bm) )
+ {
+ wxLogLastError(wxT("GetObject(bitmap)"));
+
+ return false;
+ }
+
+ int d = bm.bmBitsPixel;
if ( d <= 0 )
d = wxDisplayDepth();
- if ( !Create(w, h, d) || !CopyFromDDB(hbmp) )
+ if ( !Create(bm.bmWidth, bm.bmHeight, d) || !CopyFromDDB(hbmp) )
return false;
}
- m_hasAlpha = bmp.HasAlpha();
-
return true;
}
// initialize the palette header
pPalette->palVersion = 0x300; // magic number, not in docs but works
- pPalette->palNumEntries = biClrUsed;
+ pPalette->palNumEntries = (WORD)biClrUsed;
// and the colour table (it starts right after the end of the header)
const RGBQUAD *pRGB = (RGBQUAD *)((char *)&ds.dsBmih + ds.dsBmih.biSize);
{
// copy one DIB line
unsigned char *dst = dstLineStart;
- for ( int x = 0; x < w; x++ )
+ if ( alpha )
{
- // also, the order of RGB is inversed for DIBs
- *dst++ = src[2];
- *dst++ = src[1];
- *dst++ = src[0];
-
- src += 3;
-
- if ( alpha )
- *dst++ = *alpha++;
+ for ( int x = 0; x < w; x++ )
+ {
+ // RGB order is reversed, and we need to premultiply
+ // all channels by alpha value for use with ::AlphaBlend.
+ const unsigned char a = *alpha++;
+ *dst++ = (unsigned char)((src[2] * a + 127) / 255);
+ *dst++ = (unsigned char)((src[1] * a + 127) / 255);
+ *dst++ = (unsigned char)((src[0] * a + 127) / 255);
+ *dst++ = a;
+ src += 3;
+ }
+ }
+ else // no alpha channel
+ {
+ for ( int x = 0; x < w; x++ )
+ {
+ // RGB order is reversed.
+ *dst++ = src[2];
+ *dst++ = src[1];
+ *dst++ = src[0];
+ src += 3;
+ }
}
// pass to the previous line in the image