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fixed converting BI_BITFIELDS bitmaps to DIBs (fixes 589416)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19780 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2003-03-24 22:08:53 +00:00
parent a6b4ff2e62
commit a8beba7230
1 changed files with 24 additions and 6 deletions
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30
src/msw/dib.cpp
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@ -288,13 +288,31 @@ HBITMAP wxDIB::ConvertToBitmap(const BITMAPINFO *pbmi, HDC hdc, void *bits)
if ( !bits )
{
// we must skip over the colour table to get to the image data
// biClrUsed has the number of colors but it may be not initialized at
// all
int numColors = pbmih->biClrUsed;
if ( !numColors )
//
// colour table either has the real colour data in which case its
// number of entries is given by biClrUsed or is used for masks to be
// used for extracting colour information from true colour bitmaps in
// which case it always have exactly 3 DWORDs
int numColors;
switch ( pbmih->biCompression )
{
numColors = wxGetNumOfBitmapColors(pbmih->biBitCount);
case BI_BITFIELDS:
numColors = 3;
break;
case BI_RGB:
// biClrUsed has the number of colors but it may be not initialized at
// all
numColors = pbmih->biClrUsed;
if ( !numColors )
{
numColors = wxGetNumOfBitmapColors(pbmih->biBitCount);
}
break;
default:
// no idea how it should be calculated for the other cases
numColors = 0;
}
bits = (char *)pbmih + sizeof(*pbmih) + numColors*sizeof(RGBQUAD);