Canvas_ity Alternatives

canvas_ity reviews and mentions

• GPU-Friendly Stroke Expansion
  3 projects | news.ycombinator.com | 6 Jul 2024

  There's a relatively straightforward trick that you can do here. If you've got a transform that turns a circle into an ellipse with the relative radii and orientation that you want, then:

  1. Apply the inverse of that transform to your path.

  2. Stroke the path.

  3. Apply the transform to the result.

  This way, the path stays in place but the stroke is transformed to give it a calligraphic look. JSFiddle example: [0].

  (This was something that I tested in my tiny, single-header -like 2D rasterizer library for C++ and my Javascript port of its test suite [1].)

  For Inkscape, I think you can convert an object to a path, apply the inverse transform, do a minimal simplification to bake the transform into the path, stroke it, and then apply the forward transform. It's a bit clumsy, but I bet someone could easily create an extension script to do it.

  [0] https://jsfiddle.net/y7m16wa0/

  [1] https://github.com/a-e-k/canvas_ity/blob/main/test/test.cpp#..., https://github.com/a-e-k/canvas_ity/blob/main/test/test.html...

• Writing a TrueType font renderer
  9 projects | news.ycombinator.com | 1 Jan 2024

  I have a small TTF implementation that's in the neighborhood of that size and is open source. It's part of my canvas_ity single-header library [0] that's around 2300 LOC / 36 KB object size and implements a C++ version of most of the 2D HTML5 canvas spec [1].

  The core implementation of the TTF parsing and drawing is in L1526-L1846 with another small bit at L3205-L3274 of src/canvas_ity.hpp.

  It's something of a toy implementation that only supports western left-to-right text, and doesn't do any hinting at all, nor kerning, nor shaping. But it's enough to draw a basic "Hello world!" using any typical TTF file.

  The test suite in test/test.cpp L84-304 embeds a few custom Base64-encoded TTF files. They're small and only have a few glyphs but they do exercise a number of interesting edge cases in the OpenType TTF spec [2]. Have a look at the HTML5 port of the test suite at test/test.html in different browsers to see how their canvas implementations render those fonts.

  [0] https://github.com/a-e-k/canvas_ity

  [1] https://www.w3.org/TR/2015/REC-2dcontext-20151119/

  [2] https://standards.iso.org/ittf/PubliclyAvailableStandards/c0...

• The Lone Developer Problem
  3 projects | news.ycombinator.com | 27 Feb 2023

  Agreed, that sort of documentation is pure gold when done well.

  It's something I always try to pay forward by doing in my own code. For example, one of my own solo projects was an STB-style single-header -like rasterizer library for C++. I started the implementation half of the library with a short outline of the rendering pipeline's dataflow and the top-level functions responsible for each stage:

  https://github.com/a-e-k/canvas_ity/blob/f32fbb37e2fe7c0fcae...

• Ask HN: What have you created that deserves a second chance on HN?
  44 projects | news.ycombinator.com | 26 Jan 2023

  https://github.com/a-e-k/canvas_ity

  This is an STB-style single-header C++ library with no dependencies beyond the standard C++ library. In about 2300 lines of 78-column code (not counting blanks or comments), or 1300 semicolons, it implements an API based on the basic W3C specification to draw 2D vector graphics into an image buffer:

  - Strokes and fills (with antialiasing and gamma-correct blending)

  - Linear and radial gradients

  - Patterns (with repeat modes and bi-cubic resampling)

  - Line caps and line joins (handling high curvature)

  - Dash patterns and dash offsets

  - Transforms

  - Lines, quadratic and cubic Beziers, arcs, and rectangles

  - Text (very basic, but does its own TTF font file parsing!)

  - Raster images (i.e., sprites)

  - Clipping (via masking)

  - Compositing modes (Porter-Duff)

  - Drop shadows with Gaussian blurs

  I also uncovered a number of interesting browser quirks along the way with the HTML5 port of my testing suite.

• Hello, PNG
  13 projects | news.ycombinator.com | 18 Jan 2023
• A tiny, single-header -like 2D rasterizer for C++
  1 project | news.ycombinator.com | 10 Oct 2022
• canvas_ity - A tiny, single-header <canvas>-like 2D rasterizer
  2 projects | /r/cpp | 10 Oct 2022

  Repository: https://github.com/a-e-k/canvas_ity

• Show HN: Canvas_ity – A tiny, single-header -like 2D rasterizer for C++
  1 project | news.ycombinator.com | 9 Oct 2022
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