ntf transparency

sys/modules/opus/nft.lua

@@ -50,9 +50,10 @@ function NFT.parse(imageText)
 				currFG = getColourOf(nextChar)
 				fgNext = false
 			else
-				if nextChar ~= " " and currFG == nil then
-					currFG = _G.colors.white
-				end
+				--if nextChar ~= " " and currFG == nil then
+					-- any color not in range is considered transparent
+					-- currFG = _G.colors.white
+				--end
 				image.bg[num][writeIndex] = currBG
 				image.fg[num][writeIndex] = currFG
 				image.text[num][writeIndex] = nextChar

sys/modules/opus/ui.lua

@@ -912,10 +912,12 @@ function UI.Window:emit(event)
 	end
 end
 
+function UI.Window:getProperty(property)
+	return self[property] or self.parent and self.parent:getProperty(property)
+end
+
 function UI.Window:find(uid)
-	if self.children then
-		return Util.find(self.children, 'uid', uid)
-	end
+	return self.children and Util.find(self.children, 'uid', uid)
 end
 
 function UI.Window:eventHandler()

sys/modules/opus/ui/components/NftImage.lua

@@ -17,9 +17,12 @@ end
 
 function UI.NftImage:draw()
 	if self.image then
+		-- due to blittle, the background and foreground transparent
+		-- color is the same as the background color
+		local bg = self:getProperty('backgroundColor')
 		for y = 1, self.image.height do
 			for x = 1, #self.image.text[y] do
-				self:write(x, y, self.image.text[y][x], self.image.bg[y][x], self.image.fg[y][x])
+				self:write(x, y, self.image.text[y][x], self.image.bg[y][x], self.image.fg[y][x] or bg)
 			end
 		end
 	else

sys/modules/opus/util.lua

@@ -412,8 +412,8 @@ function Util.first(t, order)
 end
 
 --[[ File functions ]]--
-function Util.readFile(fname)
-	local f = fs.open(fname, "r")
+function Util.readFile(fname, flags)
+	local f = fs.open(fname, flags or "r")
 	if f then
 		local t = f.readAll()
 		f.close()