tests: Test the imagebox DPI and CSS stylesheet.

tests/examples/wibox/widget/imagebox/dpi.lua

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+--DOC_GEN_IMAGE --DOC_HIDE
+local parent = ... --DOC_HIDE
+local wibox  = require("wibox") --DOC_HIDE
+
+local l = wibox.layout { --DOC_HIDE
+    forced_width  = 360, --DOC_HIDE
+    spacing       = 5, --DOC_HIDE
+    layout        = wibox.layout.flex.vertical --DOC_HIDE
+} --DOC_HIDE
+
+
+
+   local image = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'..
+       '<svg width="2in" height="1in">'..
+           '<rect height="0.1in" width="0.1in" style="fill:red;" />'..
+           '<text x="10" y="32" width="150" style="font-size: 0.1in;">Hello world!</text>'..
+       '</svg>'
+
+--DOC_NEWLINE
+
+    for _, dpi in ipairs {100, 200, 300} do
+       local row = wibox.layout { --DOC_HIDE
+           spacing = 5, --DOC_HIDE
+           layout = wibox.layout.fixed.horizontal --DOC_HIDE
+       } --DOC_HIDE
+
+       row:add(wibox.widget { --DOC_HIDE
+           markup = "<b>dpi = "..dpi.."</b>", --DOC_HIDE
+           forced_width = 80, --DOC_HIDE
+           widget = wibox.widget.textbox --DOC_HIDE
+       }) --DOC_HIDE
+
+        local w = wibox.widget {
+           image         = image,
+           dpi           = dpi,
+           resize        = false,
+           forced_height = 70,
+           forced_width  = 150,
+           widget        = wibox.widget.imagebox
+       }
+
+       row:add(w) --DOC_HIDE
+       l:add(row) --DOC_HIDE
+    end
+
+parent:add(l) --DOC_HIDE
+
+--DOC_HIDE vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80

tests/examples/wibox/widget/imagebox/stylesheet.lua

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+--DOC_GEN_IMAGE --DOC_HIDE
+local parent = ... --DOC_HIDE
+local wibox  = require("wibox") --DOC_HIDE
+
+   local image = '<?xml version="1.0" encoding="UTF-8" standalone="no"?>'..
+       '<svg width="190" height="60">'..
+           '<rect x="10"  y="10" width="50" height="50" />'..
+           '<rect x="70"  y="10" width="50" height="50" class="my_class" />'..
+           '<rect x="130" y="10" width="50" height="50" id="my_id" />'..
+       '</svg>'
+
+   --DOC_NEWLINE
+
+   local stylesheet = "" ..
+        "rect { fill: #ffff00; } "..
+        ".my_class { fill: #00ff00; } "..
+        "#my_id { fill: #0000ff; }"
+
+   --DOC_NEWLINE
+
+   local w = wibox.widget {
+       forced_height = 60, --DOC_HIDE
+       forced_width  = 190, --DOC_HIDE
+       stylesheet = stylesheet,
+       image      = image,
+       widget     = wibox.widget.imagebox
+   }
+
+parent:add(w) --DOC_HIDE
+
+--DOC_HIDE vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80