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We need to redo the initialization because WinDrawLib interface modules do not match 1:1 to the implementation modules, from now on. In particular, with the D2D1 back-end, we use DWrite both for the string API and (new not yet implemented) advanced text API. The reason for disntinguishing string and text API is that later, we shall likely implement the text API also for GDI+ back-end using Uniscribe, but the simple string API does not need to load it.
The cached canvas retains the painted contents; so we can skip all the painting (as long as we need to paint the stuff dfferently).
Note it is really supported only in DWrite backend on Windows 8 and newer. If not supported, it falls back to left alignement.
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Disclaimer: This is work in progress. Anything here can be changed anytime. You have been warned.
WinDrawLib already supports simple string rendering. This PR is about more advanced text rendering, so things like this could be implemented on top of it:
Note all this is for D2D1 + DWrite back-end only. Once we have something reasonably complete, we might consider also adding support for gdi+ back-end.
Rendering features:
Additional features:
IDWriteTextLayout::GetOverhangMetrics())IDWriteTextLayout::GetLineMetrics())IDWriteTextLayout::GetClusterMetrics())