ref: d2e06d938930 gio/text/text.go -rw-r--r-- 1.8 KiB
text,font/opentype: make text layout and shaping safe for concurrent use

Implementations of text.Face are reused across multiple windows for efficiency.
Make the opentype implementation safe for concurrent use and document it.

Updates gio#104

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: remove Metrics from Face interface

It's not used in text shaping, so let's not require it.

Note that the concrete opentype package still retains the Metrics

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: simplify text layout and shaping API

First, replace LayoutOptions with an explicit maximum width parameter.  The
single-field option struct doesn't carry its weight, and I don't think we'll
see more global layout options in the future. Rather, I expect options to cover
spans of text or be part of a Font.

Second, replace the unit.Converter with an scaled text size. It's simpler and
allow the Editor and similar widgets to easily detect whether their cached
layouts are stale. Package text no longer depends on package unit, which is
now dealt with at the widget-level only.

Finally, remove the Size field from Font. It was a design mistake: a Font is
assumed to cover all sizes, as evidenced by the FontRegistry disregarding
Size when looking up fonts.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: add io.Reader Layout method to Shaper

use them for Editor, which is no longer required to construct a string
for laying out its content.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: remove String, Layout and add Glyph

In preparation for using Shaper with an io.Reader, rework the API to not refer
to strings. In particular, introduce Glyph for holding the rune in addition to
the advance. For fast traversing of the underlying text, add Len to Line with
the UTF8 length.

Layout is a useless wrapper around []Line; remove it while we're

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: convert clip.Ops to op.CallOp

MacroOp is about to lose the ability to run a different operation list
than the one it was recorded on. Text shape caches rely on that property,
and must use the new CallOp operation added for purpose.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: add Metrics method to Face interface. font/opentype: implement Metrics method for Font struct.

Signed-off-by: Werner Laurensse <werner@alman.ax>
text: remove SingleLine from LayoutOptions

Low level text layout should not deal with filtering newlines.

Updates gio#61

Signed-off-by: Elias Naur <mail@eliasnaur.com>
op/clip: split clip operations into its own package

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: match Bold weight to CSS, add Variant and Typeface
widget,text: move Label and Editor from text to widget package

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: replace Family with Shaper, add Font, Face

There is now a single shaping implementation, Shaper, for all fonts, replacing
Family that only covered a single typeface.

A typeface is identified by a name, where the empty string denotes the
default typeface.

Font is introduced to specify a particular font from the typeface, style,
weight and size.

Face is changed to an interface for a particular layout and shaping method.
The text/shape package is renamed to text/opentype and contains a Face
implementation based on golang.org/x/image/font/sfnt.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
op/paint: return ClipOp from Path.End

Instead of adding an implicit ClipOp, return a ClipOp ready to use, freeing the
caller from recording a macro.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: rename Face to Family and let Face denote a family configuration

While here, rename Family.Path to Shape which a more precise term.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
text: make text size implicit

Signed-off-by: Elias Naur <mail@eliasnaur.com>
op: add package op for operations

Extract operation types from package ui into package op.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
all: rename the gioui.org/ui module to gioui.org

The "ui" is redundant and stutters.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
all: rename layout.Dimens to layout.Dimensions

Dimens is only 4 characters shorter and not worth the abbreviation.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
ui/text: rename Center Alignment to Middle and drop IsNewline

Middle matches the similar layout.Middle constant, and IsNewline is
too simple to export.

Add documentation while we're here.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
ui: rename block to macro

It is a more precise name.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
ui/text: add LayoutOptions

Signed-off-by: Elias Naur <mail@eliasnaur.com>