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