2010-08-20 22:27:07 +02:00
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---------------------------------------------------------------------------
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2018-01-22 11:53:39 +01:00
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-- This module simplifies the creation of cairo pattern objects.
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--
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-- In most places in awesome where a color is needed, the provided argument is
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-- passed to @{gears.color}, which actually calls @{create_pattern} and creates
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-- a pattern from a given string or table.
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--
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-- This function can create solid, linear, radial and png patterns.
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--
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-- A simple example for a solid pattern is a hexadecimal color specification.
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-- For example `#ff8000` creates a solid pattern with 100% red, 50% green and 0%
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-- blue. Limited support for named colors (`red`) is also provided.
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--
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-- In general, patterns are specified as strings formatted as
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-- `"type:arguments"`. `"arguments"` is specific to the pattern being used. For
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-- example, one can use:
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-- "radial:50,50,10:55,55,30:0,#ff0000:0.5,#00ff00:1,#0000ff"
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-- The above will call @{create_radial_pattern} with the provided string, after
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-- stripping the `radial:` prefix.
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--
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-- Alternatively, patterns can be specified via tables. In this case, the
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-- table's 'type' member specifies the type. For example:
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-- {
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-- type = "radial",
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-- from = { 50, 50, 10 },
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-- to = { 55, 55, 30 },
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-- stops = { { 0, "#ff0000" }, { 0.5, "#00ff00" }, { 1, "#0000ff" } }
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-- }
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-- Any argument that cannot be understood is passed to @{create_solid_pattern}.
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--
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-- Please note that you MUST NOT modify the returned pattern, for example by
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-- calling :set_matrix() on it, because this function uses a cache and your
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-- changes could thus have unintended side effects. Use @{create_pattern_uncached}
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-- if you need to modify the returned pattern.
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-- @see create_pattern_uncached, create_solid_pattern, create_png_pattern,
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-- create_linear_pattern, create_radial_pattern
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-- @tparam string col The string describing the pattern.
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-- @return a cairo pattern object
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--
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2010-08-20 22:27:07 +02:00
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-- @author Uli Schlachter
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-- @copyright 2010 Uli Schlachter
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2019-06-06 09:49:21 +02:00
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-- @themelib gears.color
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2010-08-20 22:27:07 +02:00
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---------------------------------------------------------------------------
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local setmetatable = setmetatable
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local string = string
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local table = table
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2016-02-07 13:29:46 +01:00
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local unpack = unpack or table.unpack -- luacheck: globals unpack (compatibility with Lua 5.1)
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2010-08-20 22:27:07 +02:00
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local tonumber = tonumber
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2012-02-17 17:48:11 +01:00
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local ipairs = ipairs
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2010-09-29 18:54:20 +02:00
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local pairs = pairs
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local type = type
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2016-01-17 14:27:29 +01:00
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local lgi = require("lgi")
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local cairo = lgi.cairo
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local Pango = lgi.Pango
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2012-05-27 19:20:34 +02:00
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local surface = require("gears.surface")
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2010-08-20 22:27:07 +02:00
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2012-06-12 10:13:46 +02:00
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local color = { mt = {} }
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2015-06-13 16:55:10 +02:00
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local pattern_cache
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2010-08-20 22:27:07 +02:00
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2010-09-29 18:54:20 +02:00
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--- Parse a HTML-color.
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2016-01-17 14:27:29 +01:00
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-- This function can parse colors like `#rrggbb` and `#rrggbbaa` and also `red`.
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2016-11-22 07:41:29 +01:00
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-- Max 4 chars per channel.
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2014-05-19 15:15:39 +02:00
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--
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2010-09-29 18:54:20 +02:00
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-- @param col The color to parse
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2016-11-22 07:41:29 +01:00
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-- @treturn table 4 values representing color in RGBA format (each of them in
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-- [0, 1] range) or nil if input is incorrect.
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2014-05-19 15:15:39 +02:00
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-- @usage -- This will return 0, 1, 0, 1
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-- gears.color.parse_color("#00ff00ff")
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2012-06-12 10:13:46 +02:00
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function color.parse_color(col)
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2010-08-20 22:27:07 +02:00
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local rgb = {}
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2016-01-17 14:27:29 +01:00
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if string.match(col, "^#%x+$") then
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2016-11-20 09:40:56 +01:00
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local hex_str = col:sub(2, #col)
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local channels
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if #hex_str % 3 == 0 then
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channels = 3
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elseif #hex_str % 4 == 0 then
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channels = 4
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else
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return nil
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2016-01-17 14:27:29 +01:00
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end
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2016-11-20 09:40:56 +01:00
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local chars_per_channel = #hex_str / channels
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if chars_per_channel > 4 then
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return nil
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end
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2016-11-22 07:41:29 +01:00
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local dividor = (0x10 ^ chars_per_channel) - 1
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2016-11-20 09:40:56 +01:00
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for idx=1,#hex_str,chars_per_channel do
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local channel_val = tonumber(hex_str:sub(idx,idx+chars_per_channel-1), 16)
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table.insert(rgb, channel_val / dividor)
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end
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if channels == 3 then
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table.insert(rgb, 1)
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2016-01-17 14:27:29 +01:00
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end
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else
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local c = Pango.Color()
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2016-11-20 09:40:56 +01:00
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if not c:parse(col) then
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return nil
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2010-09-29 18:54:20 +02:00
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end
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2016-11-20 09:40:56 +01:00
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rgb = {
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c.red / 0xffff,
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c.green / 0xffff,
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c.blue / 0xffff,
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1.0
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}
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2010-08-20 22:27:07 +02:00
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end
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2016-11-20 09:40:56 +01:00
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assert(#rgb == 4, col)
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2010-08-20 22:27:07 +02:00
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return unpack(rgb)
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end
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2010-09-29 18:54:20 +02:00
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--- Find all numbers in a string
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2014-05-19 15:15:39 +02:00
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--
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-- @tparam string s The string to parse
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2010-09-29 18:54:20 +02:00
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-- @return Each number found as a separate value
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local function parse_numbers(s)
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local res = {}
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for k in string.gmatch(s, "-?[0-9]+[.]?[0-9]*") do
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table.insert(res, tonumber(k))
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end
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return unpack(res)
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end
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--- Create a solid pattern
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2014-05-19 15:15:39 +02:00
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--
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2010-09-29 18:54:20 +02:00
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-- @param col The color for the pattern
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-- @return A cairo pattern object
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2012-06-12 10:13:46 +02:00
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function color.create_solid_pattern(col)
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2010-09-29 18:54:20 +02:00
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if col == nil then
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col = "#000000"
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2012-02-17 17:48:11 +01:00
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elseif type(col) == "table" then
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col = col.color
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2010-09-29 18:54:20 +02:00
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end
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2012-06-12 10:13:46 +02:00
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return cairo.Pattern.create_rgba(color.parse_color(col))
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2010-09-29 18:54:20 +02:00
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end
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--- Create an image pattern from a png file
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2014-05-19 15:15:39 +02:00
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--
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2010-09-29 18:54:20 +02:00
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-- @param file The filename of the file
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-- @return a cairo pattern object
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2012-06-12 10:13:46 +02:00
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function color.create_png_pattern(file)
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2012-02-17 17:48:11 +01:00
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if type(file) == "table" then
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file = file.file
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end
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2012-05-27 19:20:34 +02:00
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local image = surface.load(file)
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2014-03-15 23:53:01 +01:00
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local pattern = cairo.Pattern.create_for_surface(image)
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pattern:set_extend(cairo.Extend.REPEAT)
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return pattern
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2010-09-29 18:54:20 +02:00
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end
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2015-02-20 15:45:53 +01:00
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--- Add stops to the given pattern.
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2010-09-29 18:54:20 +02:00
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-- @param p The cairo pattern to add stops to
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-- @param iterator An iterator that returns strings. Each of those strings
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2014-05-19 15:15:39 +02:00
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-- should be in the form place,color where place is in [0, 1].
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2012-02-17 17:48:11 +01:00
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local function add_iterator_stops(p, iterator)
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2010-09-29 18:54:20 +02:00
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for k in iterator do
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local sub = string.gmatch(k, "[^,]+")
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2012-06-12 10:13:46 +02:00
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local point, clr = sub(), sub()
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p:add_color_stop_rgba(point, color.parse_color(clr))
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2010-09-29 18:54:20 +02:00
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end
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end
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2015-02-20 15:45:53 +01:00
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--- Add a list of stops to a given pattern
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2012-02-17 17:48:11 +01:00
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local function add_stops_table(pat, arg)
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for _, stop in ipairs(arg) do
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2012-06-12 10:13:46 +02:00
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pat:add_color_stop_rgba(stop[1], color.parse_color(stop[2]))
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2012-02-17 17:48:11 +01:00
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end
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end
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2015-02-20 15:45:53 +01:00
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--- Create a pattern from a string
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2012-02-17 17:48:11 +01:00
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local function string_pattern(creator, arg)
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local iterator = string.gmatch(arg, "[^:]+")
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-- Create a table where each entry is a number from the original string
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local args = { parse_numbers(iterator()) }
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local to = { parse_numbers(iterator()) }
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-- Now merge those two tables
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2016-02-07 13:29:46 +01:00
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for _, v in pairs(to) do
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2012-02-17 17:48:11 +01:00
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table.insert(args, v)
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end
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-- And call our creator function with the values
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2012-02-26 05:09:09 +01:00
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local p = creator(unpack(args))
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2012-02-17 17:48:11 +01:00
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add_iterator_stops(p, iterator)
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return p
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end
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2010-09-29 18:54:20 +02:00
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--- Create a linear pattern object.
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-- The pattern is created from a string. This string should have the following
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2014-05-19 13:36:38 +02:00
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-- form: `"x0, y0:x1, y1:<stops>"`
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2012-02-17 17:48:11 +01:00
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-- Alternatively, the pattern can be specified as a table:
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2014-05-19 15:15:39 +02:00
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-- { type = "linear", from = { x0, y0 }, to = { x1, y1 },
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-- stops = { <stops> } }
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2014-05-19 13:36:38 +02:00
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-- `x0,y0` and `x1,y1` are the start and stop point of the pattern.
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-- For the explanation of `<stops>`, see `color.create_pattern`.
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-- @tparam string|table arg The argument describing the pattern.
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2010-09-29 18:54:20 +02:00
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-- @return a cairo pattern object
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2012-06-12 10:13:46 +02:00
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function color.create_linear_pattern(arg)
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2012-02-17 17:48:11 +01:00
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local pat
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if type(arg) == "string" then
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2012-05-27 19:20:34 +02:00
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return string_pattern(cairo.Pattern.create_linear, arg)
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2012-02-17 17:48:11 +01:00
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elseif type(arg) ~= "table" then
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error("Wrong argument type: " .. type(arg))
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end
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2012-05-27 19:20:34 +02:00
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pat = cairo.Pattern.create_linear(arg.from[1], arg.from[2], arg.to[1], arg.to[2])
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2012-02-17 17:48:11 +01:00
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add_stops_table(pat, arg.stops)
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return pat
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end
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2010-09-29 18:54:20 +02:00
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--- Create a radial pattern object.
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-- The pattern is created from a string. This string should have the following
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2014-05-19 13:36:38 +02:00
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-- form: `"x0, y0, r0:x1, y1, r1:<stops>"`
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2012-02-17 17:48:11 +01:00
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-- Alternatively, the pattern can be specified as a table:
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2014-05-19 15:15:39 +02:00
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-- { type = "radial", from = { x0, y0, r0 }, to = { x1, y1, r1 },
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-- stops = { <stops> } }
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2014-05-19 13:36:38 +02:00
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-- `x0,y0` and `x1,y1` are the start and stop point of the pattern.
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-- `r0` and `r1` are the radii of the start / stop circle.
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-- For the explanation of `<stops>`, see `color.create_pattern`.
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-- @tparam string|table arg The argument describing the pattern
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2010-09-29 18:54:20 +02:00
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-- @return a cairo pattern object
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2012-06-12 10:13:46 +02:00
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function color.create_radial_pattern(arg)
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2012-02-17 17:48:11 +01:00
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local pat
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2010-09-29 18:54:20 +02:00
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2012-02-17 17:48:11 +01:00
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if type(arg) == "string" then
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2012-05-27 19:20:34 +02:00
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return string_pattern(cairo.Pattern.create_radial, arg)
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2012-02-17 17:48:11 +01:00
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elseif type(arg) ~= "table" then
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error("Wrong argument type: " .. type(arg))
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2010-09-29 18:54:20 +02:00
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end
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2012-02-17 17:48:11 +01:00
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2012-05-27 19:20:34 +02:00
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pat = cairo.Pattern.create_radial(arg.from[1], arg.from[2], arg.from[3],
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2012-02-17 17:48:11 +01:00
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arg.to[1], arg.to[2], arg.to[3])
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add_stops_table(pat, arg.stops)
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return pat
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2010-09-29 18:54:20 +02:00
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end
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2012-02-17 17:48:11 +01:00
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--- Mapping of all supported color types. New entries can be added.
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2012-06-12 10:13:46 +02:00
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color.types = {
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2012-06-12 10:13:46 +02:00
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solid = color.create_solid_pattern,
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png = color.create_png_pattern,
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linear = color.create_linear_pattern,
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radial = color.create_radial_pattern
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2010-09-29 18:54:20 +02:00
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}
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--- Create a pattern from a given string.
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2014-05-19 13:36:38 +02:00
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-- For full documentation of this function, please refer to
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-- `color.create_pattern`. The difference between `color.create_pattern`
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-- and this function is that this function does not insert the generated
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-- objects into the pattern cache. Thus, you are allowed to modify the
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-- returned object.
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2014-09-13 14:16:54 +02:00
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-- @see create_pattern
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2010-09-29 18:54:20 +02:00
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-- @param col The string describing the pattern.
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-- @return a cairo pattern object
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2014-09-13 14:16:54 +02:00
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function color.create_pattern_uncached(col)
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2013-02-11 14:26:05 +01:00
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-- If it already is a cairo pattern, just leave it as that
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if cairo.Pattern:is_type_of(col) then
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return col
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end
|
2016-02-07 13:29:46 +01:00
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col = col or "#000000"
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2010-09-29 18:54:20 +02:00
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if type(col) == "string" then
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local t = string.match(col, "[^:]+")
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2012-06-12 10:13:46 +02:00
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if color.types[t] then
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2010-09-29 18:54:20 +02:00
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local pos = string.len(t)
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local arg = string.sub(col, pos + 2)
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2014-09-13 14:16:54 +02:00
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return color.types[t](arg)
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2010-09-29 18:54:20 +02:00
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end
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2012-02-17 17:48:11 +01:00
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elseif type(col) == "table" then
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local t = col.type
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2012-06-12 10:13:46 +02:00
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if color.types[t] then
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2014-09-13 14:16:54 +02:00
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return color.types[t](col)
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2012-02-17 17:48:11 +01:00
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end
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2010-09-29 18:54:20 +02:00
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end
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2014-09-13 14:16:54 +02:00
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return color.create_solid_pattern(col)
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end
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2018-01-22 11:53:39 +01:00
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|
--- Create a pattern from a given string, same as @{gears.color}.
|
2016-11-22 07:41:29 +01:00
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|
-- @see gears.color
|
2014-09-13 14:16:54 +02:00
|
|
|
function color.create_pattern(col)
|
|
|
|
if cairo.Pattern:is_type_of(col) then
|
|
|
|
return col
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|
|
|
end
|
2015-06-13 16:55:10 +02:00
|
|
|
return pattern_cache:get(col or "#000000")
|
2010-09-29 18:54:20 +02:00
|
|
|
end
|
|
|
|
|
2014-03-16 14:58:14 +01:00
|
|
|
--- Check if a pattern is opaque.
|
|
|
|
-- A pattern is transparent if the background on which it gets drawn (with
|
|
|
|
-- operator OVER) doesn't influence the visual result.
|
2014-05-19 15:15:39 +02:00
|
|
|
-- @param col An argument that `create_pattern` accepts.
|
2014-03-16 14:58:14 +01:00
|
|
|
-- @return The pattern if it is surely opaque, else nil
|
|
|
|
function color.create_opaque_pattern(col)
|
|
|
|
local pattern = color.create_pattern(col)
|
2016-02-07 13:29:46 +01:00
|
|
|
local kind = pattern:get_type()
|
2014-03-16 14:58:14 +01:00
|
|
|
|
2016-02-07 13:29:46 +01:00
|
|
|
if kind == "SOLID" then
|
|
|
|
local _, _, _, _, alpha = pattern:get_rgba()
|
|
|
|
if alpha ~= 1 then
|
2014-03-16 14:58:14 +01:00
|
|
|
return
|
|
|
|
end
|
|
|
|
return pattern
|
2016-02-07 13:29:46 +01:00
|
|
|
elseif kind == "SURFACE" then
|
|
|
|
local status, surf = pattern:get_surface()
|
|
|
|
if status ~= "SUCCESS" or surf.content ~= "COLOR" then
|
2014-03-16 14:58:14 +01:00
|
|
|
-- The surface has an alpha channel which *might* be non-opaque
|
|
|
|
return
|
|
|
|
end
|
|
|
|
|
|
|
|
-- Only the "NONE" extend mode is forbidden, everything else doesn't
|
|
|
|
-- introduce transparent parts
|
|
|
|
if pattern:get_extend() == "NONE" then
|
|
|
|
return
|
|
|
|
end
|
|
|
|
|
|
|
|
return pattern
|
2016-02-07 13:29:46 +01:00
|
|
|
elseif kind == "LINEAR" then
|
|
|
|
local _, stops = pattern:get_color_stop_count()
|
2014-03-16 14:58:14 +01:00
|
|
|
|
|
|
|
-- No color stops or extend NONE -> pattern *might* contain transparency
|
|
|
|
if stops == 0 or pattern:get_extend() == "NONE" then
|
|
|
|
return
|
|
|
|
end
|
|
|
|
|
|
|
|
-- Now check if any of the color stops contain transparency
|
|
|
|
for i = 0, stops - 1 do
|
2016-02-07 13:29:46 +01:00
|
|
|
local _, _, _, _, _, alpha = pattern:get_color_stop_rgba(i)
|
|
|
|
if alpha ~= 1 then
|
2014-03-16 14:58:14 +01:00
|
|
|
return
|
|
|
|
end
|
|
|
|
end
|
|
|
|
return pattern
|
|
|
|
end
|
|
|
|
|
|
|
|
-- Unknown type, e.g. mesh or raster source or unsupported type (radial
|
|
|
|
-- gradients can do weird self-intersections)
|
|
|
|
end
|
|
|
|
|
2015-08-06 18:54:06 +02:00
|
|
|
--- Fill non-transparent area of an image with a given color.
|
|
|
|
-- @param image Image or path to it.
|
|
|
|
-- @param new_color New color.
|
|
|
|
-- @return Recolored image.
|
2015-08-02 12:46:44 +02:00
|
|
|
function color.recolor_image(image, new_color)
|
|
|
|
if type(image) == 'string' then
|
2015-08-06 18:54:06 +02:00
|
|
|
image = surface.duplicate_surface(image)
|
2015-08-02 12:46:44 +02:00
|
|
|
end
|
|
|
|
local cr = cairo.Context.create(image)
|
|
|
|
cr:set_source(color.create_pattern(new_color))
|
|
|
|
cr:mask(cairo.Pattern.create_for_surface(image), 0, 0)
|
|
|
|
return image
|
|
|
|
end
|
|
|
|
|
2017-03-03 00:02:03 +01:00
|
|
|
--- Get a valid color for Pango markup
|
2017-03-12 11:45:41 +01:00
|
|
|
-- @param check_color The color to check.
|
2017-03-03 00:02:03 +01:00
|
|
|
-- @tparam string fallback The color to return if the first is invalid. (default: black)
|
|
|
|
-- @treturn string color if it is valid, else fallback.
|
|
|
|
function color.ensure_pango_color(check_color, fallback)
|
|
|
|
check_color = tostring(check_color)
|
2017-12-07 10:47:58 +01:00
|
|
|
-- Pango markup supports alpha, PangoColor does not. Thus, check for this.
|
|
|
|
local len = #check_color
|
|
|
|
if string.match(check_color, "^#%x+$") and (len == 5 or len == 9 or len == 17) then
|
|
|
|
return check_color
|
|
|
|
end
|
2017-03-03 00:02:03 +01:00
|
|
|
return Pango.Color.parse(Pango.Color(), check_color) and check_color or fallback or "black"
|
|
|
|
end
|
|
|
|
|
2016-02-07 13:29:46 +01:00
|
|
|
function color.mt.__call(_, ...)
|
2012-06-12 10:13:46 +02:00
|
|
|
return color.create_pattern(...)
|
|
|
|
end
|
|
|
|
|
2015-06-13 16:55:10 +02:00
|
|
|
pattern_cache = require("gears.cache").new(color.create_pattern_uncached)
|
|
|
|
|
2016-03-04 09:16:56 +01:00
|
|
|
--- No color
|
|
|
|
color.transparent = color.create_pattern("#00000000")
|
|
|
|
|
2012-06-12 10:13:46 +02:00
|
|
|
return setmetatable(color, color.mt)
|
2010-08-20 22:27:07 +02:00
|
|
|
|
2011-09-11 16:50:01 +02:00
|
|
|
-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
|