Add angle to TextArea to control text rotation
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This PR adds an
angle: f32property toTextAreato control the rotation of the text in text area. This angle is routed through toGlyphToRenderand to the shader where it's used to construct a 2d rotation matrix which is applied to the vertex positions.To make the text look smooth when rotated, the sampler mode was changed from
FilterMode::NearesttoFilterMode::Linear.When text is rotated, linear interpolation can cause artifacts on glyph borders due to interpolation against neighboring glyphs in the texture atlas. To fix this, a one pixel buffer was added to the glyph width and height when positioning the glyph in the text atlas.