132 lines
4.5 KiB
Lua
132 lines
4.5 KiB
Lua
---------------------------------------------------------------------------
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--- Handle client shapes.
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--
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-- @author Uli Schlachter <psychon@znc.in>
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-- @copyright 2014 Uli Schlachter
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-- @submodule client
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---------------------------------------------------------------------------
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-- Grab environment we need
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local surface = require("gears.surface")
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local cairo = require("lgi").cairo
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local capi =
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{
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client = client,
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}
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local shape = {}
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shape.update = {}
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--- Get one of a client's shapes and transform it to include window decorations.
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-- @function awful.client.shape.get_transformed
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-- @client c The client whose shape should be retrieved
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-- @tparam string shape_name Either "bounding" or "clip"
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function shape.get_transformed(c, shape_name)
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local border = shape_name == "bounding" and c.border_width or 0
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local shape_img = surface.load_silently(c["client_shape_" .. shape_name], false)
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local _shape = c._shape
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if not (shape_img or _shape) then return end
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-- Get information about various sizes on the client
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local geom = c:geometry()
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local _, t = c:titlebar_top()
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local _, b = c:titlebar_bottom()
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local _, l = c:titlebar_left()
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local _, r = c:titlebar_right()
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-- Figure out the size of the shape that we need
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local img_width = geom.width + 2*border
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local img_height = geom.height + 2*border
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local result = cairo.ImageSurface(cairo.Format.A1, img_width, img_height)
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local cr = cairo.Context(result)
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-- Fill everything (this paints the titlebars and border).
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-- The `cr:paint()` below will have painted the whole surface, so
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-- everything inside the client is currently meant to be visible
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cr:paint()
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if shape_img then
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-- Draw the client's shape in the middle
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cr:set_operator(cairo.Operator.SOURCE)
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cr:set_source_surface(shape_img, border + l, border + t)
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cr:rectangle(border + l, border + t, geom.width - l - r, geom.height - t - b)
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cr:fill()
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shape_img:finish()
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end
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if _shape then
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-- Draw the shape to an intermediate surface
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cr:push_group()
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-- Intersect what is drawn so far with the shape set by Lua.
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if shape_name == "clip" then
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-- Correct for the border offset
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cr:translate(-c.border_width, -c.border_width)
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end
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-- Always call the shape with the size of the bounding shape
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_shape(cr, geom.width + 2*c.border_width, geom.height + 2*c.border_width)
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-- Now fill the "selected" part
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cr:set_operator(cairo.Operator.SOURCE)
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cr:set_source_rgba(1, 1, 1, 1)
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cr:fill_preserve()
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if shape_name == "clip" then
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-- Remove an area of size c.border_width again (We use 2*bw since
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-- half of that is on the outside)
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cr:set_source_rgba(0, 0, 0, 0)
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cr:set_line_width(2*c.border_width)
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cr:stroke()
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end
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-- Combine the result with what we already have
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cr:pop_group_to_source()
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cr:set_operator(cairo.Operator.IN)
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cr:paint()
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-- 'cr' is kept alive until Lua's GC frees it. Make sure it does not
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-- keep the group alive since that's a large image surface.
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cr:set_source_rgba(0, 0, 0, 0)
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end
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return result
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end
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--- Update all of a client's shapes from the shapes the client set itself.
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-- @function awful.client.shape.update.all
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-- @client c The client to act on
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function shape.update.all(c)
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shape.update.bounding(c)
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shape.update.clip(c)
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end
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--- Update a client's bounding shape from the shape the client set itself.
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-- @function awful.client.shape.update.bounding
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-- @client c The client to act on
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function shape.update.bounding(c)
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local res = shape.get_transformed(c, "bounding")
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c.shape_bounding = res and res._native
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-- Free memory
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if res then
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res:finish()
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end
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end
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--- Update a client's clip shape from the shape the client set itself.
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-- @function awful.client.shape.update.clip
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-- @client c The client to act on
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function shape.update.clip(c)
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local res = shape.get_transformed(c, "clip")
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c.shape_clip = res and res._native
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-- Free memory
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if res then
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res:finish()
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end
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end
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capi.client.connect_signal("property::shape_client_bounding", shape.update.bounding)
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capi.client.connect_signal("property::shape_client_clip", shape.update.clip)
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capi.client.connect_signal("property::size", shape.update.all)
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capi.client.connect_signal("property::border_width", shape.update.all)
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return shape
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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