Text rendering rewrite

[BigBadaboom]

The rendering of text is being completely rewritten. Among the improvements:

• Correct handling of nested layout with differing text properties (includes fix for Text-Anchor isn't being respected in the SVG #241 etc)
• Proper text shaping. At least for non-txtPath elements
• Correct handling for RTL text
• Support for writing-mode and vertical text (see not support for "writing-mode" #151)
• etc

Not yet confirmed:

• Support multi-value text geometry attributes feature request (Support multi-value text geometry attributes #248)
• Support alignment-baseline and dominant-baseline feature request (Support alignment-baseline and dominant-baseline #247)
• textLength attribute is not used feature request (textLength attribute is not used #216)
• support @font-face (Why are you can't support font-face??? #206)

[theojarrus]

Hey! Any updates here? First of all, thanks for the work, incredible library, it even supports parsing nested svgs, which even standalone utilities, including android studio, cannot do. I'm writing a multi-platform library for chord images runtime generation and I really need a feature with text aligment (dominant-baseline etc). Is there any plans for this in the near future?

[BigBadaboom]

Proper *-baseline support is awkward, because Android doesn't provide access to that sort of font metadata.
I have been trying to keep AndroidSVG as minimal as possible. So I am reluctant to add font file parsing to the code, just to access the font's BASE table. Probably the best solution I could achieve would be to use heuristics to estimate the values, as the CSS spec suggests..

[theojarrus]

Found a workaround for text vertical centering, maybe it will be useful for someone else, so I'll leave it here. Just add dy=".35em" to text element