hqx を Homebrew, dnf でインストール

プロジェクトリンク

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コマンドとエイリアス

• hqx

プロジェクトの歴史

The grom358 implementation packages Maxim Stepin's hqx pixel-art scaling family as a buildable Unix library and CLI. Its NEWS file says version 1.0 added 24-bit color support, a command-line tool using the DevIL image library, and an autotools build system.

The README explains the algorithmic shape: each source pixel is evaluated against its 3-by-3 neighborhood, color differences are calculated in YUV space, a 256-entry lookup table selects interpolation patterns, and the result preserves sharp edges better than nearest-neighbor scaling for sprites and line art.

採用の歴史

The README ties hqx to emulator culture, naming Nestopia, bsnes, ZSNES, Snes9x, and FCE Ultra as users of the algorithm family. Homebrew and Fedora packaging make the grom358 library/CLI available outside emulator source trees.

使われ方

The documented CLI usage is `hqx -s scaleBy input output`, where the scale is 2, 3, or 4. The library API exposes functions such as `hq4x_32` after `hqxInit()`, allowing applications to scale RGB bitmaps directly.

The filter is intended for images with sharp edges, such as pixel art, line graphics, and cartoon sprites, rather than photographs.

パッケージ好きにとっての重要性

hqx matters because it packages a once-emulator-specific graphics algorithm as a reusable system library and filter command. That is exactly the sort of niche media primitive package managers keep alive: small, old-school, useful when you need it, and awkward to rederive from scratch.

Its significance is also historical: hq2x/hq3x/hq4x belong to the era when emulator authors competed to make low-resolution console graphics look acceptable on higher-resolution displays without losing pixel-art structure.

タイムライン

• 2001-2002: Archived HiEnd3D hq2x material carries Maxim Stepin copyright dates.
• 1.0: The grom358 NEWS file records 24-bit color support, the DevIL-based command-line tool, and autotools build support.
• 1.2: Homebrew packages the grom358 hqx implementation as version 1.2.

Related projects

• hq2x, hq3x, and hq4x are the three scaling filters implemented by the package.
• DevIL is the image library required by the documented command-line build.
• Nestopia, bsnes, ZSNES, Snes9x, and FCE Ultra are emulator projects named in the upstream README as users of the hqx algorithm family.
• Scale2x and 2xSaI are neighboring pixel-art scaling algorithms shown alongside hq2x in preserved HiEnd3D comparison material.

ソース

• https://formulae.brew.sh/formula/hqx
• https://github.com/grom358/hqx
• https://github.com/grom358/hqx/blob/master/NEWS
• https://web.archive.org/web/20131205091805/http://www.hiend3d.com/hq2x.html