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Ilia Sharin 21751c0025 docs(amiga): complete AmigaOS 3.1/3.2 developer reference — 172 files across 17 sections

Comprehensive technical documentation covering:
- Hardware: OCS/ECS/AGA custom chip registers, Copper & Blitter deep dives
- Boot sequence: cold boot through startup-sequence
- Binary format: HUNK executable spec, relocation, debug info
- Linking & ABI: .fd files, LVO tables, register calling conventions
- Exec kernel: tasks, interrupts, memory, signals, semaphores
- AmigaDOS: file I/O, FFS/OFS layout, CLI/Shell scripting
- Graphics: planar bitmaps, Copper programming, HAM/EHB modes
- Intuition: screens, windows, IDCMP, BOOPSI
- Devices: trackdisk, SCSI, serial, timer, audio, keyboard
- Libraries: utility, expansion, IFFParse, locale, ARexx
- Networking: bsdsocket API, SANA-II, TCP/IP stack comparison
- Toolchain: GCC, vasm/vlink, SAS/C, NDK, debugging
- Reverse engineering: IDA/Ghidra setup, compiler fingerprints, case studies
- CPU & MMU: 68040/060 emulation libs, PMMU, cache management
- Driver development: SANA-II, Picasso96/RTG, AHI audio

All files include breadcrumb navigation. No local paths or proprietary content.

2026-04-23 12:17:35 -04:00

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← Home · Libraries

layers.library — Window Clipping Layers

Overview

layers.library provides the clipping and damage-repair infrastructure that Intuition windows are built on. Each window's RastPort is backed by a Layer that manages overlapping regions.

Layer Types

Flag	Type	Description
`LAYERSIMPLE`	Simple Refresh	Application must redraw damaged areas
`LAYERSMART`	Smart Refresh	System saves obscured regions
`LAYERSUPER`	Super BitMap	Application provides full-size bitmap
`LAYERBACKDROP`	Backdrop	Behind all other layers

Key Functions

struct Layer_Info *li = NewLayerInfo();

struct Layer *layer = CreateUpfrontLayer(li, bitmap,
    x1, y1, x2, y2, LAYERSMART, NULL);

/* Lock before drawing: */
LockLayer(0, layer);
/* ... draw into layer->rp ... */
UnlockLayer(layer);

/* Move: */
MoveLayer(0, layer, dx, dy);

/* Resize: */
SizeLayer(0, layer, dw, dh);

/* Cleanup: */
DeleteLayer(0, layer);
DisposeLayerInfo(li);

References

NDK39: graphics/layers.h, graphics/clip.h

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