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51 lines
1.1 KiB
Markdown
51 lines
1.1 KiB
Markdown
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[← Home](../README.md) · [Libraries](README.md)
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# layers.library — Window Clipping Layers
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## Overview
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`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.
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---
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## Layer Types
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| Flag | Type | Description |
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|---|---|---|
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| `LAYERSIMPLE` | Simple Refresh | Application must redraw damaged areas |
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| `LAYERSMART` | Smart Refresh | System saves obscured regions |
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| `LAYERSUPER` | Super BitMap | Application provides full-size bitmap |
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| `LAYERBACKDROP` | Backdrop | Behind all other layers |
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---
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## Key Functions
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```c
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struct Layer_Info *li = NewLayerInfo();
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struct Layer *layer = CreateUpfrontLayer(li, bitmap,
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x1, y1, x2, y2, LAYERSMART, NULL);
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/* Lock before drawing: */
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LockLayer(0, layer);
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/* ... draw into layer->rp ... */
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UnlockLayer(layer);
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/* Move: */
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MoveLayer(0, layer, dx, dy);
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/* Resize: */
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SizeLayer(0, layer, dw, dh);
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/* Cleanup: */
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DeleteLayer(0, layer);
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DisposeLayerInfo(li);
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```
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---
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## References
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- NDK39: `graphics/layers.h`, `graphics/clip.h`
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