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add some wxIMAGE_OPTION_PNG_xxx options to wxImage and wxPNGHandler to allow the user to set the desired compression level (closes #10372)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58103 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2009-01-14 17:54:38 +00:00
parent 09ddabf738
commit d19ce8c491
4 changed files with 97 additions and 15 deletions
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37
samples/image/image.cpp
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@@ -268,6 +268,43 @@ public:
{
image.SetOption(wxIMAGE_OPTION_PNG_FORMAT, pngvalues[sel]);
image.SetOption(wxIMAGE_OPTION_PNG_BITDEPTH, sel % 2 ? 16 : 8);
// these values are taken from OptiPNG with -o3 switch
const wxString compressionChoices[] =
{
_T("compression = 9, memory = 8, strategy = 0, filter = 0"),
_T("compression = 9, memory = 9, strategy = 0, filter = 0"),
_T("compression = 9, memory = 8, strategy = 1, filter = 0"),
_T("compression = 9, memory = 9, strategy = 1, filter = 0"),
_T("compression = 1, memory = 8, strategy = 2, filter = 0"),
_T("compression = 1, memory = 9, strategy = 2, filter = 0"),
_T("compression = 9, memory = 8, strategy = 0, filter = 5"),
_T("compression = 9, memory = 9, strategy = 0, filter = 5"),
_T("compression = 9, memory = 8, strategy = 1, filter = 5"),
_T("compression = 9, memory = 9, strategy = 1, filter = 5"),
_T("compression = 1, memory = 8, strategy = 2, filter = 5"),
_T("compression = 1, memory = 9, strategy = 2, filter = 5"),
};
int sel = wxGetSingleChoiceIndex(_T("Select compression option (Cancel to use default)\n"),
_T("PNG Compression Options"),
WXSIZEOF(compressionChoices),
compressionChoices,
this);
if (sel != -1)
{
const int zc[] = {9, 9, 9, 9, 1, 1, 9, 9, 9, 9, 1, 1};
const int zm[] = {8, 9, 8, 9, 8, 9, 8, 9, 8, 9, 8, 9};
const int zs[] = {0, 0, 1, 1, 2, 2, 0, 0, 1, 1, 2, 2};
const int f[] = {0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
0xF8, 0xF8, 0xF8, 0xF8, 0xF8, 0xF8};
image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL , zc[sel]);
image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL , zm[sel]);
image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY , zs[sel]);
image.SetOption(wxIMAGE_OPTION_PNG_FILTER , f[sel]);
image.SetOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE, 1048576); // 1 MB
}
}
}
else if ( extension == _T("cur") )