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Frontend and UI
cross-platform-ui
cross-platform UI toolkit
Flutter, Compose
System
Techniques · 15
Primitives · 31
cross-platform-ui
Box constraint layout
graphics · medium: One-pass layout: constraints go down, sizes go up, parent sets position (Flutter-style)
Signals and fine-grained reactivity
graphics · medium: A dependency graph of signals, memos and effects where reads auto-subscribe, so a state change re-runs exactly the outputs that used it, with no tree diff.
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Flexbox layout
graphics · medium: CSS flexbox algorithm: flex basis, grow and shrink resolution, wrapping and alignment
Hit testing and gestures
graphics · medium: Map pointer events to the UI tree and arbitrate competing gesture recognizers
Layer compositing
graphics · medium: Composite retained layers or surfaces on the GPU; overlay planes, opacity and transforms
Path rasterization coverage
graphics · medium: Scanline or sparse-strip coverage accumulation with nonzero and even-odd fill and analytic antialiasing
Positional memoization
graphics · medium: Store composition state by call-site position in a slot table (Jetpack Compose)
Unicode line breaking
graphics · low: UAX 14 line break opportunities plus hyphenation hooks
Damage tracking
graphics · low: Track dirty rectangles so each frame repaints and recomposites only what changed
Display list recording
graphics · low: Record draw commands into a replayable list for caching, culling and off-thread raster
Gap buffer
graphics · low: Array with a movable gap for O(1) edits at the cursor; text editors and slot tables
Accessibility tree
agentic-ai · low: Extracting the browser/OS accessibility tree (roles, names, bounds) as a compact text view of a UI for agents
Calling conventions abi
compilers · low: System V, Windows x64 and AAPCS64 ABIs: argument registers, stack frames, struct passing, FFI
Animation springs easing
graphics · low: Easing curves and critically damped spring integration for interruptible UI animations
Glyph atlas caching
graphics · low: Rasterize glyphs on demand into GPU texture atlases keyed by glyph, size and subpixel offset
Vsync frame pacing
graphics · low: Vsync, swapchain presentation modes, frame pacing, latency and variable refresh
Topological sort
graphs · low: Order the vertices of a DAG so every edge points forward; the core of build systems, schedulers and dependency resolution, with cycle detection for free.
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Homogeneous transforms
geometry · low: 4x4 affine and projective matrices, homogeneous coordinates, view and projection, normal matrices
R-tree
geometry · low: A balanced tree of nested bounding boxes that indexes rectangles and points, answering window and nearest-neighbour queries by pruning whole subtrees.
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Statecharts
graphics · low: State machines with nesting, parallel regions, history and entry/exit actions, so UI and animation logic stays linear in size instead of exploding.
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Alpha compositing
graphics · low: Porter-Duff compositing with premultiplied alpha and blend modes
Display scanout modesetting
graphics · low: KMS: CRTCs, planes, atomic commits, page flips, vblank events and direct scanout
GPU command buffers
graphics · low: Record GPU work as a flat list of commands on the CPU, submit it in batches, and reuse its memory through a ring of frames in flight guarded by fences.
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+ 8 more techniques
+ 15 more primitives
System
Techniques · 15
Primitives · 31
cross-platform-ui
Box constraint layout
graphics · medium: One-pass layout: constraints go down, sizes go up, parent sets position (Flutter-style)
Signals and fine-grained reactivity
graphics · medium: A dependency graph of signals, memos and effects where reads auto-subscribe, so a state change re-runs exactly the outputs that used it, with no tree diff.
›
Flexbox layout
graphics · medium: CSS flexbox algorithm: flex basis, grow and shrink resolution, wrapping and alignment
Hit testing and gestures
graphics · medium: Map pointer events to the UI tree and arbitrate competing gesture recognizers
Layer compositing
graphics · medium: Composite retained layers or surfaces on the GPU; overlay planes, opacity and transforms
Path rasterization coverage
graphics · medium: Scanline or sparse-strip coverage accumulation with nonzero and even-odd fill and analytic antialiasing
Positional memoization
graphics · medium: Store composition state by call-site position in a slot table (Jetpack Compose)
Retained mode ui tree
graphics · medium: Widget, element and render-object trees with rebuild, relayout and repaint boundaries
Text shaping
graphics · medium: Map Unicode to positioned glyphs via OpenType GSUB/GPOS lookups, clusters and complex scripts
Unicode bidi algorithm
graphics · medium: UAX 9: resolve embedding levels and reorder mixed left-to-right and right-to-left text
Block inline layout
graphics · medium: CSS box model: block formatting, inline formatting contexts, line boxes, floats and margins
Css cascade inheritance
graphics · medium: Resolve computed styles: origin and specificity ordering, inheritance, custom properties
Font fallback itemization
graphics · medium: Split text into runs by script, direction and font coverage; pick fallback fonts per run
Incremental computation
systems · medium: Dependency graph of derived values recomputed only when inputs change (reactive cells, spreadsheets)
Css selector matching
graphics · medium: Right-to-left selector matching with ancestor Bloom filters, rule hashing and style sharing
Unicode line breaking
graphics · low: UAX 14 line break opportunities plus hyphenation hooks
Damage tracking
graphics · low: Track dirty rectangles so each frame repaints and recomposites only what changed
Display list recording
graphics · low: Record draw commands into a replayable list for caching, culling and off-thread raster
Gap buffer
graphics · low: Array with a movable gap for O(1) edits at the cursor; text editors and slot tables
Accessibility tree
agentic-ai · low: Extracting the browser/OS accessibility tree (roles, names, bounds) as a compact text view of a UI for agents
Calling conventions abi
compilers · low: System V, Windows x64 and AAPCS64 ABIs: argument registers, stack frames, struct passing, FFI
Animation springs easing
graphics · low: Easing curves and critically damped spring integration for interruptible UI animations
Glyph atlas caching
graphics · low: Rasterize glyphs on demand into GPU texture atlases keyed by glyph, size and subpixel offset
Vsync frame pacing
graphics · low: Vsync, swapchain presentation modes, frame pacing, latency and variable refresh
Topological sort
graphs · low: Order the vertices of a DAG so every edge points forward; the core of build systems, schedulers and dependency resolution, with cycle detection for free.
›
Homogeneous transforms
geometry · low: 4x4 affine and projective matrices, homogeneous coordinates, view and projection, normal matrices
R-tree
geometry · low: A balanced tree of nested bounding boxes that indexes rectangles and points, answering window and nearest-neighbour queries by pruning whole subtrees.
›
Statecharts
graphics · low: State machines with nesting, parallel regions, history and entry/exit actions, so UI and animation logic stays linear in size instead of exploding.
›
Alpha compositing
graphics · low: Porter-Duff compositing with premultiplied alpha and blend modes
Display scanout modesetting
graphics · low: KMS: CRTCs, planes, atomic commits, page flips, vblank events and direct scanout
GPU command buffers
graphics · low: Record GPU work as a flat list of commands on the CPU, submit it in batches, and reuse its memory through a ring of frames in flight guarded by fences.
›
Bézier curves
graphics · low: Smooth curves defined by 3-4 control points, evaluated and split with repeated linear interpolation (de Casteljau) and flattened to lines with a closed-form segment count.
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Parallel prefix sum
search-sort · low: Work-efficient scan (Blelloch, decoupled look-back) on CPU SIMD and GPUs; stream compaction
Keyed list reconciliation
graphics · low: Minimal DOM moves for keyed children using a longest increasing subsequence
Opentype font parsing
graphics · low: Sfnt tables (cmap, glyf, CFF, hmtx, GSUB, GPOS), variable font axes, safe parsing
Unicode text tokenization for search
search-sort · low: Turn multilingual text into index terms: segment words (UAX 29 style, CJK bigrams), normalize, case-fold and accent-fold, identically at index and query time.
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Text position encoding
compilers · low: Store byte offsets, convert to (line, column) on demand with a line-start table and binary search, and count columns in the unit the peer negotiated.
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String interning
data-structures · low: Store each distinct string once and refer to it by id
Hash consing
data-structures · low: Intern structurally equal immutable terms so equality is pointer comparison and sharing is maximal
Swiss table
data-structures · low: Open-addressing hash table that filters 8-16 slots at once with 1-byte hash tags and SIMD, giving fast lookups at 87.5 % load.
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Bloom filter
data-structures · low: Bit array answering "definitely not present" or "probably present" in about 10 bits per key for 1 % false positives; inserts are cheap, deletes impossible.
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Gpu synchronization fences
graphics · low: Fences, timeline semaphores and sync files between GPU queues, CPU and processes
BFS and DFS
graphs · low: The two basic graph traversals; BFS gives hop distances and levels, DFS gives discovery/finish order for cycles, components and topological order.
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Text normalization
machine-learning · low: Rewrite messy text into one canonical form for matchers and models, or into spoken words for speech output (and back), keeping a map to the original offsets.
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Sparse matrices (CSR)
numerics · low: Compressed sparse row stores only nonzeros as row pointers, column indices and values; SpMV streams them once, so it is memory-bandwidth bound.
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Hierarchical state machine
systems · low: Nest states so a substate inherits its parent's reactions and only overrides what differs, with ordered entry and exit actions along the path.
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