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------------------------------------------------------------------------------
--
-- LGI Pango override module.
--
-- Copyright (c) 2012 Pavel Holejsovsky
-- Licensed under the MIT license:
-- http://www.opensource.org/licenses/mit-license.php
--
------------------------------------------------------------------------------
local pairs, rawget = pairs, rawget
local table = require 'table'
local lgi = require 'lgi'
local Pango = lgi.Pango
local core = require 'lgi.core'
local gi = core.gi
local ffi = require 'lgi.ffi'
local ti = ffi.types
local record = require 'lgi.record'
local component = require 'lgi.component'
-- Provide defines which are not present in the GIR
local _ = Pango.SCALE
for name, value in pairs {
SCALE_XX_SMALL = 1 / (1.2 * 1.2 * 1.2),
SCALE_X_SMALL = 1 / (1.2 * 1.2),
SCALE_SMALL = 1 / 1.2,
SCALE_MEDIUM = 1,
SCALE_LARGE = 1.2,
SCALE_X_LARGE = 1.2 * 1.2,
SCALE_XX_LARGE = 1.2 * 1.2 * 1.2,
} do
if not Pango[name] then
Pango._constant[name] = value
end
end
-- Because of https://bugzilla.gnome.org/show_bug.cgi?id=672133 Pango
-- enums are not gtype based on some platforms. If we detect non-gtype
-- enum, reload it using ffi and GEnumInfo machinery.
for _, enum in pairs {
'AttrType', 'Underline', 'BidiType', 'Direction', 'CoverageLevel',
'Style', 'Variant', 'Weight', 'Stretch', 'FontMask', 'Gravity',
'GravityHint', 'Alignment', 'WrapMode', 'EllipsizeMode', 'RenderPart',
'Script', 'TabAlign',
} do
if not Pango[enum]._gtype then
local gtype = ffi.load_gtype(
core.gi.Pango.resolve,
'pango_' .. core.uncamel(enum) .. '_get_type')
Pango._enum[enum] = ffi.load_enum(gtype, 'Pango.' .. enum)
end
end
local pango_layout_set_text = Pango.Layout.set_text
function Pango.Layout:set_text(text, len)
pango_layout_set_text(self, text, len or -1)
end
local pango_layout_set_markup = Pango.Layout.set_markup
function Pango.Layout:set_markup(text, len)
pango_layout_set_markup(self, text, len or -1)
end
-- Pango.Layout:set_attributes() has incorrect transfer-full
-- annotation on its attrs argument. Workaround for
-- https://github.com/pavouk/lgi/issues/60
if gi.Pango.Layout.methods.set_attributes.args[1].transfer ~= 'none' then
local _ = Pango.Layout.set_attributes
Pango.Layout.set_attributes = core.callable.new {
addr = core.gi.Pango.resolve.pango_layout_set_attributes,
name = 'Pango.Layout.set_attributes',
ret = ti.void,
gi.Pango.Layout.methods.new.return_type,
gi.Pango.Layout.methods.set_attributes.args[1].typeinfo,
}
end
-- Add attributes simulating logically missing properties in Pango classes.
for compound, attrs in pairs {
[Pango.Layout] = {
'attributes', 'font_description', 'width', 'height', 'wrap', 'context',
'is_wrapped', 'ellipsize', 'is_ellipsized', 'indent', 'spacing',
'justify', 'auto_dir', 'alignment', 'tabs', 'single_paragraph_mode',
'baseline', 'line_count', 'lines', 'log_attrs', 'character_count',
'text', 'markup',
},
[Pango.Context] = {
'base_dir', 'base_gravity', 'font_description', 'font_map', 'gravity',
'gravity_hint', 'language', 'matrix',
},
[Pango.FontMetrics] = {
'ascent', 'descent', 'approximate_char_width', 'approximate_digit_width',
'underline_thickness', 'underline_position',
'strikethrough_thinkess', 'strikethrough_position',
},
} do
compound._attribute = rawget(compound, '_attribute') or {}
for _, name in pairs(attrs) do
if not compound._property or not compound._property[name] then
compound._attribute[name] = {
get = compound['get_' .. name] or compound[name],
set = compound['set_' .. name],
}
end
end
end
-- Handling of poor-man's OO invented by Pango.Attribute related
-- pseudoclasses.
Pango.Attribute._free = core.gi.Pango.Attribute.methods.destroy
for name, def in pairs {
language_new = { Pango.Language },
family_new = { ti.utf8 },
style_new = { Pango.Style },
variant_new = { Pango.Variant },
stretch_new = { Pango.Stretch },
weight_new = { Pango.Weight },
size_new = { ti.int },
size_new_absolute = { ti.int },
desc_new = { Pango.FontDescription },
foreground_new = { ti.uint16, ti.uint16, ti.uint16 },
background_new = { ti.uint16, ti.uint16, ti.uint16 },
strikethrough_new = { ti.boolean },
strikethrough_color_new = { ti.uint16, ti.uint16, ti.uint16 },
underline_new = { Pango.Underline },
underline_color_new = { ti.uint16, ti.uint16, ti.uint16 },
shape_new = { Pango.Rectangle, Pango.Rectangle },
scale_new = { ti.double },
rise_new = { ti.int },
letter_spacing_new = { ti.int },
fallback_new = { ti.boolean },
gravity_new = { Pango.Gravity },
gravity_hint_new = { Pango.GravityHint },
} do
def.addr = core.gi.Pango.resolve['pango_attr_' .. name]
def.name = 'Pango.Attribute.' .. name
def.ret = { Pango.Attribute, xfer = true }
Pango.Attribute[name] = core.callable.new(def)
end
-- Adding Pango.Attribute into the Pango.AttrList takes ownership of
-- the record. Pfft, crappy API, wrap and handle.
for _, name in pairs { 'insert', 'insert_before', 'change' } do
local raw_method = Pango.AttrList[name]
Pango.AttrList[name] = function(list, attr)
-- Invoke original method first, then unown the attribute.
raw_method(list, attr)
core.record.set(attr, false)
end
end
-- Pango.Layout:move_cursor_visually() is missing an (out) annotation
-- in older Pango releases. Work around this limitation by creating
-- custom ffi definition for this method.
if gi.Pango.Layout.methods.move_cursor_visually.args[6].direction ~= 'out' then
local _ = Pango.Layout.move_cursor_visually
Pango.Layout.move_cursor_visually = core.callable.new {
addr = core.gi.Pango.resolve.pango_layout_move_cursor_visually,
name = 'Pango.Layout.move_cursor_visually',
ret = ti.void,
gi.Pango.Layout.methods.new.return_type,
ti.boolean, ti.int, ti.int, ti.int,
{ ti.int, dir = 'out' }, { ti.int, dir = 'out' },
}
end
-- Pango.GlyphString is struct with counted array inside, until
-- Pango-1.38 which has fixed annotation. Fix for previous versions.
if gi.Pango.GlyphString.fields.glyphs.typeinfo.tag ~= 'array' then
Pango.GlyphString._attribute = { glyphs = {} }
function Pango.GlyphString._attribute.glyphs:get()
local array = core.record.field(self, Pango.GlyphString._field.glyphs)
local glyphs = {}
for i = 0, self.num_glyphs - 1 do
glyphs[i + 1] = core.record.fromarray(array, i)
end
return glyphs
end
end
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