libschrift
canvas_ity
libschrift | canvas_ity | |
---|---|---|
2 | 7 | |
432 | 319 | |
- | - | |
0.0 | 2.5 | |
about 2 months ago | 2 months ago | |
C | C++ | |
ISC License | ISC License |
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libschrift
canvas_ity
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Writing a TrueType font renderer
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...
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The Lone Developer Problem
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...
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Ask HN: What have you created that deserves a second chance on HN?
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
- A tiny, single-header -like 2D rasterizer for C++
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canvas_ity - A tiny, single-header <canvas>-like 2D rasterizer
Repository: https://github.com/a-e-k/canvas_ity
- Show HN: Canvas_ity – A tiny, single-header -like 2D rasterizer for C++
What are some alternatives?
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art - @Bigfan/art is a React custom renderer for HTML5 Canvas.
osxphotos - Python app to work with pictures and associated metadata from Apple Photos on macOS. Also includes a package to provide programmatic access to the Photos library, pictures, and metadata.
fpng - Super fast C++ .PNG writer/reader
figlet-fonts - my collection of figlet / toilet ascii art fonts
jetson-nano-image - Create minimalist, Ubuntu based images for the Nvidia jetson boards [Moved to: https://github.com/pythops/jetson-image]
formkiq-core - A full-featured Document Layer for your application, providing the functionality of a flexible document management system, including storage, discovery, processing, and retrieval. Deploys directly into your Amazon Web Services Cloud. 🌟 Star to support our work!
rosettaboy - A gameboy emulator in several different languages
pics - File formats dissections and more...
fpnge - Demo of a fast PNG encoder.