71 lines
2.1 KiB
Lua
71 lines
2.1 KiB
Lua
---------------------------------------------------------------------------
|
|
-- @author Uli Schlachter
|
|
-- @copyright 2012 Uli Schlachter
|
|
-- @release @AWESOME_VERSION@
|
|
---------------------------------------------------------------------------
|
|
|
|
local setmetatable = setmetatable
|
|
local type = type
|
|
local capi = { awesome = awesome }
|
|
local cairo = require("lgi").cairo
|
|
|
|
-- Keep this in sync with build-utils/lgi-check.sh!
|
|
local ver_major, ver_minor = string.match(require('lgi.version'), '(%d)%.(%d)')
|
|
if tonumber(ver_major) <= 0 and tonumber(ver_minor) < 7 then
|
|
error("lgi too old, need at least version 0.7.0")
|
|
end
|
|
|
|
-- gears.surface
|
|
local surface = { mt = {} }
|
|
local surface_cache = setmetatable({}, { __mode = 'v' })
|
|
|
|
--- Try to convert the argument into an lgi cairo surface.
|
|
-- This is usually needed for loading images by file name.
|
|
function surface.load_uncached(_surface)
|
|
-- Nil is not changed
|
|
if not _surface then
|
|
return nil
|
|
end
|
|
-- Remove from cache if it was cached
|
|
surface_cache[_surface] = nil
|
|
-- lgi cairo surfaces don't get changed either
|
|
if cairo.Surface:is_type_of(_surface) then
|
|
return _surface
|
|
end
|
|
-- Strings are assumed to be file names and get loaded
|
|
if type(_surface) == "string" then
|
|
_surface = capi.awesome.load_image(_surface)
|
|
end
|
|
-- Everything else gets forced into a surface
|
|
return cairo.Surface(_surface, true)
|
|
end
|
|
|
|
function surface.load(_surface)
|
|
if type(_surface) == "string" then
|
|
local cache = surface_cache[_surface]
|
|
if not cache then
|
|
cache = surface.load_uncached(_surface)
|
|
surface_cache[_surface] = cache
|
|
end
|
|
return cache
|
|
end
|
|
return surface.load_uncached(_surface)
|
|
end
|
|
|
|
function surface.mt:__call(...)
|
|
return surface.load(...)
|
|
end
|
|
|
|
--- Get the size of a cairo surface
|
|
-- @param surf The surface you are interested in
|
|
-- @return The surface's width and height
|
|
function surface.get_size(surf)
|
|
local cr = cairo.Context(surf)
|
|
local x, y, w, h = cr:clip_extents()
|
|
return w - x, h - y
|
|
end
|
|
|
|
return setmetatable(surface, surface.mt)
|
|
|
|
-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
|