This document open in two windows of TEdit, the WYSIWYG editor of Medley Interlisp, shows a gallery of bitmaps available for Lisp applications and tools.

#bitmap #interlisp #lisp #retrocomputing

Bitmap and tilemap generation from a single example

https://github.com/mxgmn/WaveFunctionCollapse

#HackerNews #Bitmap #Tilemap #Generation #WaveFunctionCollapse #GameDevelopment

I created a tool in #godot to create #bitmap #fonts. It was a helper tool for #waddlewords. And I liked it that much that I also decided to publish it on #itch.

https://dunkelgrau.itch.io/bitmap-font-creator

GrobPaint

GrobPaint is a lightweight cross-platform bitmap editor that sits somewhere between MS Paint and Paint.NET, offering layers, blend modes, selection tools, sprite-sheet helpers, and(...)

#apps #bitmap #crossplatform #graphics #imageeditor #javascript #paint #python

https://taoofmac.com/space/apps/grobpaint?utm_content=atom&utm_source=mastodon&utm_medium=social

Глубокий разбор материализованных представлений в StarRocks: полный механизм query rewrite

Материализованные представления (MV) в StarRocks — это не просто кэш агрегатов, а полноценный механизм ускорения запросов с автоматическим переписыванием (query rewrite). На практических примерах разбираем, как движок сопоставляет поддеревья плана запроса со SPJG‑MV, как работают join/aggregate/nested/union rewrite, как обеспечивается строгая согласованность и настраиваемая устарелость данных (staleness), и за счёт чего достигается ускорение на SSB и TPC‑H.

https://habr.com/ru/articles/980320/

#StarRocks #материализованные_представления #query_rewrite #SPJG #OLAP #BI #rollup #bitmap #predicate_pushdown #partition_pruning

Re-reading old code and I’m reminded of this old trick for doing bit-manipulation:

I was trying to shift right an u8 by a value between 1 and 8 bits:

If shift equals 0, this would be an 8 bits shift, I wanted the result to be zero (all bits shifted), but that's not how (some) CPUs work; so it's undefined behaviour, and in Rust, the compiler will throw a compile error (if it's a const shift), or panic at runtime in debug mode.

One could test if shift is 8, and adjust code accordingly, but this adds branches and even more code.

So the trick to work around that is simply... to shift twice ! One time for the first bit, and another for the last (potential 7):

And that's how one can do this operation fully branchless.

(another version of this post appeared on a now-defunct instance)

#RustLang #bitmap #BitManip