I am happy to announce that I uploaded the first version of High-DPI
TImageList. The LCL part should be complete, the win32 part as well.
There is one backwards compatibility issue: adding sprites - their
support is broken (the image is added as one and not cut into several
images). I haven't done the design-time part yet either. That means that
the ImageList dialog doesn't support multiple resolutions. But
everything else should be good.
+ Good news: I was able to add interpolation support with alpha chanel
(did you know FPC supports it? :) ) !!! So images are scaled smoothly
and nicely without any external library evolved - and it is supported on
all OS/WS. Obviously scaling down works better than scaling up.
For now I tested Win32 only - other widgetsets will be probably broken.
I'll take a look into them later.
Issue report with a test project:
https://bugs.freepascal.org/view.php?id=32967
Branch to test:
https://svn.freepascal.org/svn/lazarus/branches/HiDPIImageList
Please test and comment - especially component vendors.
To take advantage of the new PPI features in your control you have to
replace all ImgList.Width, ImgList.Height, ImgList.Draw* etc. methods
with PPI-aware properties/constructs. Like:
ImgList.Width -> ImgList.WidthForImagePPI[DesiredWidthAt96PPI,
Font.PixelsPerInch]
- or -
ImgResolution := ImgList.ResolutionForImagePPI[DesiredWidthAt96PPI,
Font.PixelsPerInch];
ImgResolution := ImgList.Resolution[DesiredWidthRegardlessOfPPI];
ImageWidth := ImgResolution.Width;
ImageHeight := ImgResolution.Height;
ImgResolution.Draw(...);
ImgResolution.GetBitmap(...);
etc.
Ondrej
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