[Bug 44409] New: png with indexed colors and alpha miss the alpha channel on loading
wine-bugs at winehq.org
wine-bugs at winehq.org
Tue Jan 23 22:08:11 CST 2018
https://bugs.winehq.org/show_bug.cgi?id=44409
Bug ID: 44409
Summary: png with indexed colors and alpha miss the alpha
channel on loading
Product: Wine
Version: 3.0
Hardware: x86
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gdiplus
Assignee: wine-bugs at winehq.org
Reporter: nikolaysemenkov at gmail.com
Distribution: ---
Created attachment 60332
--> https://bugs.winehq.org/attachment.cgi?id=60332
1 bit png with alpha
The 1bit png with alpha is attached.
Wine loads it as PixelFormat1bppIndexed, which means no alpha preserved
Windows loads it as PixelFormat32bppARGB which means windows does conversion
because pixelformat is not match to PixelFormat1bppIndexed(because otherwise it
lost alpha).
The same happens for 8 bit png with alpha.
Could you please add supporting loading alpha channel for 1 and 8 bit pngs in
the same way as windows does, ie convert to PixelFormat32bppARGB.
Thanks.
The func to load png:
HBITMAP loadBitmap(const wchar_t* path)
{
HBITMAP tBmp = NULL;
ULONG_PTR token = 0;
Gdiplus::GdiplusStartupInput input = NULL;
Gdiplus::GdiplusStartup(&token, &input, NULL);
if (token != 0)
{
Gdiplus::Bitmap* bmp = new Gdiplus::Bitmap(path);
bmp->GetHBITMAP(Gdiplus::Color::Transparent, &tBmp);
delete bmp;
Gdiplus::GdiplusShutdown(token);
}
return tBmp;
}
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