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73 lines
2.8 KiB
Plaintext
73 lines
2.8 KiB
Plaintext
/**********************************************************************
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Audacity: A Digital Audio Editor
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WxWishlist.dox2
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James Crook
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********************************************************************//**
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\page WxWishList WX Wish List
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\section WxWishlistIntro Introduction
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We're using this section to record requests for enhancements to
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wxWidgets. It's here in the documentation on the source code, because
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it indicates issues we have 'worked around' which we'd like a cleaner
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solution to.
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\section WxWishlistTransparency Transparency, Masks, Alpha, wxImages and wxBitmaps
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At the time of writing, wxWidgets support for alpha-channel based
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transparency is patchy.
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- Support for masks, that is all or nothing transparency, is excellent.
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- Support for alpha channel transparency, that is where values between
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0 and 255 let some but not all of the background show through, is
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incomplete. It seems to be best supported on Windows, and least well
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supported on Mac.
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Mask based transparency leads to sharp edges that look blocky and 'dated' on
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modern PC's - so we try to use alpha blending when we need transparency .
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Support for alpha blending in wxImage and wxBitmap is different.
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- wxImage is a platform neutral image. There are nice functions
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for loading and saving PNGs with transparency to or from a wxImage.
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These work on all platforms we use.
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- wxBitmap is a platform specific 'image'. To display an image it
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must at some point be converted to a wxBitmap.
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Now, a 32 bit wxBitmap has 24 bits for RGB and 8 bits for alpha. Under
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WindowsXP you can paste wxBitmaps into a wxMemDc and preserve the alpha
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channel. However, when you convert to a wxImage, unless you use an
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undocumented function which only works on WindowsXP, you lose it. To
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output a wxBitmap to a file you have to convert to a wxImage.
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The workarounds for the incomplete alpha-channel support can be found
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in \ref ImageManipulation.cpp . Also, in implementing \ref Themability
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we keep both wxImages and wxBitmaps to work around the conversion
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problems.
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So, the wishlist item is for wxWidgets to sort this out!
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\section WxWishlistTreebook wxTreeBook
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We know a wxTreeBook is coming in wxWidgets 2.7.0. We're using
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a contrib-version that works pretty well, but using it as
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if it were a wxListBook. We've tried using wxWidgets 2.6.3
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undocumented versions of wxChoiceBook and wxListBook, and
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in 2.6.3, neither is ready for prime time.
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We're looking forward to having a built in wxTreeBook.
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\section WxWishlist Docking And Layout System
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There are contrib directories that have partial implementations of
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Toolbar docking and layout. Our own system is rather hacked together,
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and just about meets our needs. We'd like a full strength system built
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in to wxWidgets.
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*//********************************************************************/ |