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Allow saving 24 bpp ICO file in wxImage.

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Create ICO files with 24bpp if the image being saved contains more than 256
colours.

Also use smaller values (4 bpp or monochrome) if the image uses fewer colours.

See #15918.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76133 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2014-03-12 23:04:19 +00:00
parent 7e64a29edb
commit 818e5f3a48
2 changed files with 30 additions and 4 deletions
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32
src/common/imagbmp.cpp
View File

@@ -1274,8 +1274,34 @@ bool wxICOHandler::SaveFile(wxImage *image,
mask.SetRGB(i, j, 0, 0, 0 );
}
// Set the formats for image and mask
// (Windows never saves with more than 8 colors):
image->SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_8BPP);
// The format depends on the number of the colours used, so count them,
// but stop at 257 because we have to use 24 bpp anyhow if we have that
// many of them.
const int colours = image->CountColours(257);
int bppFormat;
int bpp;
if ( colours > 256 )
{
bppFormat = wxBMP_24BPP;
bpp = 24;
}
else if ( colours > 16 )
{
bppFormat = wxBMP_8BPP;
bpp = 8;
}
else if ( colours > 2 )
{
bppFormat = wxBMP_4BPP;
bpp = 4;
}
else
{
bppFormat = wxBMP_1BPP;
bpp = 1;
}
image->SetOption(wxIMAGE_OPTION_BMP_FORMAT, bppFormat);
// monochome bitmap:
mask.SetOption(wxIMAGE_OPTION_BMP_FORMAT, wxBMP_1BPP_BW);
@@ -1352,7 +1378,7 @@ bool wxICOHandler::SaveFile(wxImage *image,
icondirentry.bColorCount = 0;
icondirentry.bReserved = 0;
icondirentry.wPlanes = wxUINT16_SWAP_ON_BE(1);
icondirentry.wBitCount = wxUINT16_SWAP_ON_BE(wxBMP_8BPP);
icondirentry.wBitCount = wxUINT16_SWAP_ON_BE(bpp);
if ( type == 2 /*CUR*/)
{
int hx = image->HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) ?