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background: Improve the fallback rendering accuracy. 

While it has a little aliasing problem, it actually correctly
renders the border using a mask like the normal code path.
This commit is contained in:
Emmanuel Lepage Vallee 2021-10-15 19:42:48 -07:00
parent 206bc7e5de
commit 203d0638be
1 changed files with 32 additions and 13 deletions
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45
lib/wibox/container/background.lua
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@ -39,14 +39,6 @@ function background._use_fallback_algorithm()
shape(cr, width, height)
if bw > 0 then
cr:save() --Save to avoid messing with the original source
cr:set_line_width(bw)
cr:set_source(color(self._private.shape_border_color or self._private.foreground or beautiful.fg_normal))
cr:stroke_preserve()
cr:restore()
end
if self._private.background then
cr:save() --Save to avoid messing with the original source
cr:set_source(self._private.background)
@ -61,18 +53,45 @@ function background._use_fallback_algorithm()
cr:set_source(self._private.foreground)
end
end
background.after_draw_children = function(self, _, cr, width, height)
local bw = self._private.shape_border_width or 0
local shape = self._private.shape or gshape.rectangle
if bw > 0 then
cr:save()
cr:translate(bw, bw)
width, height = width - 2*bw, height - 2*bw
shape(cr, width, height)
cr:set_line_width(bw)
cr:reset_clip()
local mat = cr:get_matrix()
-- Prevent the inner part of the border from being written.
local mask = cairo.RecordingSurface(cairo.Content.COLOR_ALPHA,
cairo.Rectangle { x = 0, y = 0, width = mat.x0 + width, height = mat.y0 + height })
local mask_cr = cairo.Context(mask)
mask_cr:translate(mat.x0, mat.y0)
-- Clear the surface.
mask_cr:set_operator(cairo.Operator.CLEAR)
mask_cr:set_source_rgba(0, 1, 0, 0)
mask_cr:paint()
-- Paint the inner and outer borders.
mask_cr:set_operator(cairo.Operator.SOURCE)
mask_cr:translate(bw, bw)
mask_cr:set_source_rgba(1, 0, 0, 1)
mask_cr:set_line_width(2*bw)
shape(mask_cr, width - 2*bw, height - 2*bw)
mask_cr:stroke_preserve()
-- Remove the inner part.
mask_cr:set_source_rgba(0, 1, 0, 0)
mask_cr:set_operator(cairo.Operator.CLEAR)
mask_cr:fill()
mask:flush()
cr:set_source(color(self._private.shape_border_color or self._private.foreground or beautiful.fg_normal))
cr:stroke()
cr:mask_surface(mask, 0,0)
cr:restore()
end
end