add semi-auto bbox option in page crop dialog

frontend/document/djvudocument.lua

@@ -87,7 +87,7 @@ function DjvuDocument:invertTextYAxel(pageno, text_table)
 end
 
 function DjvuDocument:getPageBBox(pageno)
-	if self.configurable.text_wrap ~= 1 and self.configurable.trim_page == 1 then
+	if self.configurable.text_wrap ~= 1 and self.configurable.trim_page > 0 then
 		return self.koptinterface:getAutoBBox(self, pageno)
 	else
 		return Document.getPageBBox(self, pageno)

frontend/document/koptinterface.lua

@@ -75,10 +75,31 @@ function KoptInterface:getContextHash(doc, pageno, bbox)
 end
 
 function KoptInterface:getAutoBBox(doc, pageno)
+	local bbox = {
+		x0 = 0, y0 = 0,
+		x1 = 0, y1 = 0,
+	}
+	local context_hash = self:getContextHash(doc, pageno, bbox)
+	local hash = "autobbox|"..context_hash
+	local cached = Cache:check(hash)
+	if not cached then
+		local page = doc._document:openPage(pageno)
+		local kc = self:createContext(doc, pageno, bbox)
+		bbox.x0, bbox.y0, bbox.x1, bbox.y1 = page:getAutoBBox(kc)
+		DEBUG("Auto detected bbox", bbox)
+		page:close()
+		Cache:insert(hash, CacheItem:new{ autobbox = bbox })
+		return bbox
+	else
+		return cached.autobbox
+	end
+end
+
+function KoptInterface:getSemiAutoBBox(doc, pageno)
 	-- use manual bbox
 	local bbox = Document.getPageBBox(doc, pageno)
 	local context_hash = self:getContextHash(doc, pageno, bbox)
-	local hash = "autobbox|"..context_hash
+	local hash = "semiautobbox|"..context_hash
 	local cached = Cache:check(hash)
 	if not cached then
 		local page = doc._document:openPage(pageno)
@@ -89,12 +110,12 @@ function KoptInterface:getAutoBBox(doc, pageno)
 		auto_bbox.y0 = auto_bbox.y0 + bbox.y0
 		auto_bbox.x1 = auto_bbox.x1 + bbox.x0
 		auto_bbox.y1 = auto_bbox.y1 + bbox.y0
-		DEBUG("Auto detected bbox", auto_bbox)
+		DEBUG("Semi-auto detected bbox", auto_bbox)
 		page:close()
-		Cache:insert(hash, CacheItem:new{ autobbox = auto_bbox })
+		Cache:insert(hash, CacheItem:new{ semiautobbox = auto_bbox })
 		return auto_bbox
 	else
-		return cached.autobbox
+		return cached.semiautobbox
 	end
 end
 

frontend/document/pdfdocument.lua

@@ -92,8 +92,13 @@ end
 
 function PdfDocument:getPageBBox(pageno)
 	if self.configurable.text_wrap ~= 1 and self.configurable.trim_page == 1 then
+		-- auto bbox finding
 		return self.koptinterface:getAutoBBox(self, pageno)
+	elseif self.configurable.text_wrap ~= 1 and self.configurable.trim_page == 2 then
+		-- semi-auto bbox finding
+		return self.koptinterface:getSemiAutoBBox(self, pageno)
 	else
+		-- get saved manual bbox
 		return Document.getPageBBox(self, pageno)
 	end
 end

frontend/ui/data/koptoptions.lua

@@ -23,12 +23,12 @@ KoptOptions = {
 			{
 				name = "trim_page",
 				name_text = PAGE_CROP_STR,
-				toggle = {AUTO_STR, MANUAL_STR},
+				toggle = {MANUAL_STR, AUTO_STR, SEMIAUTO_STR},
 				alternate = false,
-				values = {1, 0},
+				values = {0, 1, 2},
 				default_value = DKOPTREADER_CONFIG_TRIM_PAGE,
 				event = "PageCrop",
-				args = {"auto", "manual"},
+				args = {"manual", "auto", "semi-auto"},
 			}
 		}
 	},

frontend/ui/data/strings.lua

@@ -25,6 +25,7 @@ ON_STR = _("on")
 OFF_STR = _("off")
 AUTO_STR = _("auto")
 MANUAL_STR = _("manual")
+SEMIAUTO_STR = _("semi-auto")
 SMALL_STR = _("small")
 MEDIUM_STR = _("medium")
 LARGE_STR = _("large")