class TermBuf::Damage

• TermBuf::Damage
• Reference
• Object

Overview

Which cells have changed since the last paint, tracked as one column span per row.

A span rather than a per-cell bitmap because the paint loop walks rows anyway, and rather than a whole-row flag because a status line that changes three characters should not cost a full row of output. The row count lets #any? answer without scanning, so a paint with nothing to do is free.

Defined in:

termbuf/core/damage.cr

Constructors

• .new(height : Int32)

Instance Method Summary

• #clear : Nil

  Marks every row clean.

• #dirty?(y : Int32) : Bool

  Whether row y has changed.

• #dirty? : Bool

  Whether anything at all has changed.

• #each(& : Int32, Range(Int32, Int32) -> ) : Nil

  Yields each dirty row and its changed columns, top to bottom.

• #height : Int32

  How many rows are tracked.

• #resize(height : Int32) : Nil

  Resizes to height rows, discarding any spans: a resize forces a full repaint, so there is nothing worth carrying over.

• #rows : Int32

  Number of rows carrying a span.

• #span(y : Int32) : Range(Int32, Int32) | Nil

  The changed columns of row y, or nil when the row is clean.

• #touch(x : Int32, y : Int32) : Nil

  Records that the cell at (x, y) changed.

• #touch_all(width : Int32) : Nil

  Marks every cell of every row as changed.

• #touch_span(y : Int32, from : Int32, to : Int32) : Nil

  Records that columns from through to of row y changed.

Constructor Detail

Instance Method Detail