ReaderDogEar: Enforce a minimum size, too (#7369)

* Add a semi-transparent version of the dogear icon
* Ensure the dogear won't become too tiny to be useful

frontend/apps/reader/modules/readerdogear.lua

@@ -17,7 +17,8 @@ function ReaderDogear:init()
     -- to not overwrite the book text.
     -- For other documents, there is no easy way to know if valuable content
     -- may be hidden by the icon (kopt's page_margin is quite obscure).
-    self.dogear_max_size = math.ceil( math.min(Screen:getWidth(), Screen:getHeight()) / 32)
+    self.dogear_min_size = math.ceil(math.min(Screen:getWidth(), Screen:getHeight()) / 40)
+    self.dogear_max_size = math.ceil(math.min(Screen:getWidth(), Screen:getHeight()) / 32)
     self.dogear_size = nil
     self.dogear_y_offset = 0
     self.top_pad = nil
@@ -38,10 +39,11 @@ function ReaderDogear:setupDogear(new_dogear_size)
         self.vgroup = VerticalGroup:new{
             self.top_pad,
             IconWidget:new{
-                icon = "dogear.opaque",
+                icon = "dogear.alpha",
                 rotation_angle = BD.mirroredUILayout() and 90 or 0,
                 width = self.dogear_size,
                 height = self.dogear_size,
+                alpha = true, -- Keep the alpha layer intact
             }
         }
         self[1] = RightContainer:new{
@@ -79,7 +81,7 @@ function ReaderDogear:onSetPageMargins(margins)
     -- top & right margins and be sure no text is hidden by the icon
     -- (the provided margins are not scaled, so do as ReaderTypeset)
     local margin = Screen:scaleBySize(math.max(margin_top, margin_right))
-    local new_dogear_size = math.min(self.dogear_max_size, margin)
+    local new_dogear_size = math.min(self.dogear_max_size, math.max(self.dogear_min_size, margin))
     self:setupDogear(new_dogear_size)
 end
 

resources/icons/mdlight/dogear.alpha.svg

@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   width="48"
+   height="48"
+   viewBox="0 0 48 48"
+   enable-background="new 0 0 24.00 24.00"
+   xml:space="preserve"
+   id="svg4"
+   sodipodi:docname="dogear.alpha.svg"
+   inkscape:version="1.0.2 (e86c870879, 2021-01-15)"
+   inkscape:export-filename="/home/niluje/MPLAYER/koreader/resources/icons/mdlight/dogear.opaque.png"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"><sodipodi:namedview
+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="2560"
+   inkscape:window-height="1381"
+   id="namedview6"
+   showgrid="true"
+   inkscape:zoom="16.610526"
+   inkscape:cx="23.798479"
+   inkscape:cy="21.341888"
+   inkscape:window-x="0"
+   inkscape:window-y="0"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="svg4"
+   inkscape:document-rotation="0"><inkscape:grid
+     type="xygrid"
+     id="grid856" /></sodipodi:namedview><metadata
+   id="metadata10"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title /></cc:Work></rdf:RDF></metadata><defs id="defs8"></defs>
+
+<path
+   id="path871"
+   style="fill:#ffffff;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:0.12;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:0.999901"
+   d="M 48,46 V 0 H 2 Z"
+   sodipodi:nodetypes="cccc" /><path
+   style="opacity:1;fill:#ffffff;fill-opacity:0.5;stroke:#000000;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;stroke-opacity:1"
+   d="M 1.9999949,2 V 45.999919 H 46 Z"
+   id="path1127"
+   sodipodi:nodetypes="cccc"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96" /></svg>