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TODO.md

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Current backend improvements

  • git grep FIXME
  • SVG renderer, try to handle more glyph cuts.
  • SVG renderer, give the opportunity to use SVG glyphs ? If no font resolver is provided, do it like now otherwise embed glyphs.
  • Canvas, try to handle more glyph cuts, transform mess.
  • PDF, implement stream compression. LZW would be easiest, deflate would be nice.
  • PDF, implement gradients with alpha, have a look at how Inkscape encodes them.
  • PDF, implement font subsetting.
  • PDF, text extraction, consider also using /ToUnicode maps instead of solely /ActualText. http://lists.cairographics.org/archives/cairo/2007-September/011427.html

Raster image primitive

val Image.raster : Gg.box2 -> Gg.raster -> image

  • Accept directly a Gg.raster or create a proxy resolved by backends like for fonts ? Problem is source is quite different e.g. in html canvas. Gg's raster formats can be plentiful, normalize or mandate a few formats ?
  • Q: will js_of_ocaml support bigarrays over typed arrays once ?
  • Potentially add this comment under Remarks and tips {- Images are said to be immutable. This is only true if you don't change the samples of raster images given to {!I.raster}.}

Path convenience

Quite a few convience operations on paths could be added. This would be only at the Vg level, renderers wouldn't need to be extended. But does it really belong in Vg ? Tension between general computational geometry lib and rendering lib. However quite a few of these things could be used by a potential rasterizer.

  • P.mem : area -> path -> p2 -> bool
  • P.length : path -> float (* arc length *)
  • P.split : path -> float -> path * path (* split at given distance on path *)
  • P.cubic_fold
  • P.square
  • Boolean operations on paths
  • Minkowski sum
  • The folds that are test/attic_path.ml

I'm more and more convinced that this doesn't belong in Vg though, the folds in attic_path.ml also show that this can be provided as an external component with minimal reliance on Vg.Vgr.Private.

Blending groups and operators

Support more blending operators, but is it really that used in practice ? Support group opacity, that would be really useful, however HTML canvas doesn't support it.

From an API point of view it's just a matter of adding the following two optional parameters to I.blend:

I.blend : ?a:float -> ?blender:blender -> image -> image -> image

Software rasterizer and OpenGL backend

Db images ideas

  • Test miànjï 面积 (area, surface area), vector.
  • Test font http://www.twardoch.com/fonts/ Nadeyezhda
  • Quadratic paths.
  • Test degenerate color stops discarding.
  • Test degenerate subpaths rendering.
  • Dash offset is for start of each subpath, negative.
  • Primitives, special cases axial with p = p', radial with c = c'.
  • Test geometric primitives, quadric and ellipse for pdf renderer.
  • The IEEE 754 double floating point line vs the real line.
  • The IEEE 754 double floating point grid vs the real plane
  • How many doubles between 10 and 11, 100 and 101, 1000 and 1001, etc. or 2 ** n and 2 ** n+1.
  • Rectangle, area cut of w = 0 or s = 0 is nothing but outline cut is segment.