class TermBuf::StyleTable

• TermBuf::StyleTable
• Reference
• Object

Overview

Interns styles so a Cell can carry a four byte id rather than the whole struct.

Two cells with equal styles always get the same id, which turns the paint diff's style comparison into an integer compare and lets the encoder cache one SGR byte string per id.

The table only grows. An application cycling through distinct styles — an animated colour gradient, say — accumulates entries at roughly 32 bytes each; a hundred thousand of them costs a few megabytes. Real applications use tens.

Defined in:

termbuf/core/style_table.cr

Constant Summary

DEFAULT = 0_u32

The id of Style::DEFAULT, which every table assigns first.

Constructors

• .new

Instance Method Summary

• #[](id : StyleId) : Style

  The style id refers to.

• #[]?(id : StyleId) : Style | Nil

  The style id refers to, or nil if it was never assigned.

• #each(& : StyleId, Style -> ) : Nil

  Yields every interned style with its id, in the order they were added.

• #id(style : Style) : StyleId

  The id for style, assigning one if this is the first time it is seen.

• #size : Int32

  Number of distinct styles interned so far.

Constructor Detail

Instance Method Detail