238 lines
7.8 KiB
Lua
238 lines
7.8 KiB
Lua
---------------------------------------------------------------------------
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-- @author Uli Schlachter
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-- @copyright 2012 Uli Schlachter
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-- @module gears.wallpaper
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---------------------------------------------------------------------------
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local cairo = require("lgi").cairo
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local color = require("gears.color")
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local surface = require("gears.surface")
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local timer = require("gears.timer")
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local root = root
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local wallpaper = { mt = {} }
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local function root_geometry()
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local width, height = root.size()
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return { x = 0, y = 0, width = width, height = height }
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end
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-- Information about a pending wallpaper change, see prepare_context()
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local pending_wallpaper = nil
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local function get_screen(s)
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return s and screen[s]
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end
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--- Prepare the needed state for setting a wallpaper.
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-- This function returns a cairo context through which a wallpaper can be drawn.
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-- The context is only valid for a short time and should not be saved in a
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-- global variable.
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-- @param s The screen to set the wallpaper on or nil for all screens
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-- @return[1] The available geometry (table with entries width and height)
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-- @return[1] A cairo context that the wallpaper should be drawn to
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function wallpaper.prepare_context(s)
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s = get_screen(s)
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local root_width, root_height = root.size()
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local geom = s and s.geometry or root_geometry()
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local source, target, cr
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if not pending_wallpaper then
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-- Prepare a pending wallpaper
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source = surface(root.wallpaper())
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target = source:create_similar(cairo.Content.COLOR, root_width, root_height)
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-- Set the wallpaper (delayed)
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timer.delayed_call(function()
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local paper = pending_wallpaper
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pending_wallpaper = nil
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wallpaper.set(paper.surface)
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paper.surface:finish()
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end)
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elseif root_width > pending_wallpaper.width or root_height > pending_wallpaper.height then
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-- The root window was resized while a wallpaper is pending
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source = pending_wallpaper.surface
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target = source:create_similar(cairo.Content.COLOR, root_width, root_height)
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else
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-- Draw to the already-pending wallpaper
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source = nil
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target = pending_wallpaper.surface
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end
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cr = cairo.Context(target)
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if source then
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-- Copy the old wallpaper to the new one
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cr:save()
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cr.operator = cairo.Operator.SOURCE
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cr:set_source_surface(source, 0, 0)
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cr:paint()
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cr:restore()
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end
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pending_wallpaper = {
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surface = target,
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width = root_width,
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height = root_height
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}
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-- Only draw to the selected area
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cr:translate(geom.x, geom.y)
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cr:rectangle(0, 0, geom.width, geom.height)
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cr:clip()
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return geom, cr
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end
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--- Set the current wallpaper.
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-- @param pattern The wallpaper that should be set. This can be a cairo surface,
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-- a description for gears.color or a cairo pattern.
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-- @see gears.color
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function wallpaper.set(pattern)
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if cairo.Surface:is_type_of(pattern) then
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pattern = cairo.Pattern.create_for_surface(pattern)
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end
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if type(pattern) == "string" or type(pattern) == "table" then
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pattern = color(pattern)
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end
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if not cairo.Pattern:is_type_of(pattern) then
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error("wallpaper.set() called with an invalid argument")
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end
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root.wallpaper(pattern._native)
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end
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--- Set a centered wallpaper.
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-- @param surf The wallpaper to center. Either a cairo surface or a file name.
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-- @param s The screen whose wallpaper should be set. Can be nil, in which case
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-- all screens are set.
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-- @param background The background color that should be used. Gets handled via
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-- gears.color. The default is black.
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-- @see gears.color
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function wallpaper.centered(surf, s, background)
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local geom, cr = wallpaper.prepare_context(s)
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local original_surf = surf
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surf = surface.load_uncached(surf)
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background = color(background)
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-- Fill the area with the background
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cr.operator = cairo.Operator.SOURCE
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cr.source = background
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cr:paint()
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-- Now center the surface
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local w, h = surface.get_size(surf)
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cr:translate((geom.width - w) / 2, (geom.height - h) / 2)
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cr:rectangle(0, 0, w, h)
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cr:clip()
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cr:set_source_surface(surf, 0, 0)
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cr:paint()
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if surf ~= original_surf then
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surf:finish()
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end
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assert(cr.status == "SUCCESS", "Cairo context entered error state: " .. cr.status)
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end
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--- Set a tiled wallpaper.
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-- @param surf The wallpaper to tile. Either a cairo surface or a file name.
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-- @param s The screen whose wallpaper should be set. Can be nil, in which case
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-- all screens are set.
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-- @param offset This can be set to a table with entries x and y.
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function wallpaper.tiled(surf, s, offset)
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local _, cr = wallpaper.prepare_context(s)
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if offset then
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cr:translate(offset.x, offset.y)
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end
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local original_surf = surf
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surf = surface.load_uncached(surf)
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local pattern = cairo.Pattern.create_for_surface(surf)
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pattern.extend = cairo.Extend.REPEAT
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cr.source = pattern
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cr.operator = cairo.Operator.SOURCE
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cr:paint()
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if surf ~= original_surf then
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surf:finish()
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end
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assert(cr.status == "SUCCESS", "Cairo context entered error state: " .. cr.status)
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end
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--- Set a maximized wallpaper.
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-- @param surf The wallpaper to set. Either a cairo surface or a file name.
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-- @param s The screen whose wallpaper should be set. Can be nil, in which case
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-- all screens are set.
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-- @param ignore_aspect If this is true, the image's aspect ratio is ignored.
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-- The default is to honor the aspect ratio.
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-- @param offset This can be set to a table with entries x and y.
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function wallpaper.maximized(surf, s, ignore_aspect, offset)
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local geom, cr = wallpaper.prepare_context(s)
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local original_surf = surf
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surf = surface.load_uncached(surf)
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local w, h = surface.get_size(surf)
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local aspect_w = geom.width / w
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local aspect_h = geom.height / h
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if not ignore_aspect then
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aspect_h = math.max(aspect_w, aspect_h)
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aspect_w = math.max(aspect_w, aspect_h)
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end
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cr:scale(aspect_w, aspect_h)
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if offset then
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cr:translate(offset.x, offset.y)
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elseif not ignore_aspect then
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local scaled_width = geom.width / aspect_w
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local scaled_height = geom.height / aspect_h
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cr:translate((scaled_width - w) / 2, (scaled_height - h) / 2)
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end
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cr:set_source_surface(surf, 0, 0)
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cr.operator = cairo.Operator.SOURCE
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cr:paint()
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if surf ~= original_surf then
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surf:finish()
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end
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assert(cr.status == "SUCCESS", "Cairo context entered error state: " .. cr.status)
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end
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--- Set a fitting wallpaper.
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-- @param surf The wallpaper to set. Either a cairo surface or a file name.
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-- @param s The screen whose wallpaper should be set. Can be nil, in which case
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-- all screens are set.
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-- @param background The background color that should be used. Gets handled via
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-- gears.color. The default is black.
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-- @see gears.color
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function wallpaper.fit(surf, s, background)
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local geom, cr = wallpaper.prepare_context(s)
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local original_surf = surf
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surf = surface.load_uncached(surf)
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background = color(background)
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-- Fill the area with the background
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cr.operator = cairo.Operator.SOURCE
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cr.source = background
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cr:paint()
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-- Now fit the surface
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local w, h = surface.get_size(surf)
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local scale = geom.width / w
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if h * scale > geom.height then
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scale = geom.height / h
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end
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cr:translate((geom.width - (w * scale)) / 2, (geom.height - (h * scale)) / 2)
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cr:rectangle(0, 0, w * scale, h * scale)
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cr:clip()
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cr:scale(scale, scale)
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cr:set_source_surface(surf, 0, 0)
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cr:paint()
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if surf ~= original_surf then
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surf:finish()
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end
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assert(cr.status == "SUCCESS", "Cairo context entered error state: " .. cr.status)
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end
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return wallpaper
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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