fit-to-content only if smaller size than bounding box

pdfreader.lua

@@ -135,8 +135,9 @@ function PDFReader:setzoom(page)
 	local dc = pdf.newDC()
 	local pwidth, pheight = page:getSize(self.nulldc)
 
-	if self.globalzoommode == self.ZOOM_FIT_TO_PAGE then
-		self.globalzoom = width / pwidth ----------
+	if self.globalzoommode == self.ZOOM_FIT_TO_PAGE
+	or self.globalzoommode == self.ZOOM_FIT_TO_CONTENT then
+		self.globalzoom = width / pwidth
 		self.offset_x = 0
 		self.offset_y = (height - (self.globalzoom * pheight)) / 2
 		if height / pheight < self.globalzoom then
@@ -144,34 +145,43 @@ function PDFReader:setzoom(page)
 			self.offset_x = (width - (self.globalzoom * pwidth)) / 2
 			self.offset_y = 0
 		end
-	elseif self.globalzoommode == self.ZOOM_FIT_TO_PAGE_WIDTH then
+	elseif self.globalzoommode == self.ZOOM_FIT_TO_PAGE_WIDTH
+	or self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_WIDTH then
 		self.globalzoom = width / pwidth
 		self.offset_x = 0
 		self.offset_y = (height - (self.globalzoom * pheight)) / 2
-	elseif self.globalzoommode == self.ZOOM_FIT_TO_PAGE_HEIGHT then
+	elseif self.globalzoommode == self.ZOOM_FIT_TO_PAGE_HEIGHT
+	or self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_HEIGHT then
 		self.globalzoom = height / pheight
 		self.offset_x = (width - (self.globalzoom * pwidth)) / 2
 		self.offset_y = 0
-	elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT then
+	end
+	if self.globalzoommode == self.ZOOM_FIT_TO_CONTENT then
 		local x0, y0, x1, y1 = page:getUsedBBox()
-		self.globalzoom = width / (x1 - x0)
-		self.offset_x = -1 * x0 * self.globalzoom
-		self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
-		if height / (y1 - y0) < self.globalzoom then
-			self.globalzoom = height / (y1 - y0)
-			self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
-			self.offset_y = -1 * y0 * self.globalzoom
+		if (x1 - x0) < pwidth then
+			self.globalzoom = width / (x1 - x0)
+			self.offset_x = -1 * x0 * self.globalzoom
+			self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
+			if height / (y1 - y0) < self.globalzoom then
+				self.globalzoom = height / (y1 - y0)
+				self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
+				self.offset_y = -1 * y0 * self.globalzoom
+			end
 		end
 	elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_WIDTH then
 		local x0, y0, x1, y1 = page:getUsedBBox()
-		self.globalzoom = width / (x1 - x0)
-		self.offset_x = -1 * x0 * self.globalzoom
-		self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
+		if (x1 - x0) < pwidth then
+			self.globalzoom = width / (x1 - x0)
+			self.offset_x = -1 * x0 * self.globalzoom
+			self.offset_y = -1 * y0 * self.globalzoom + (height - (self.globalzoom * (y1 - y0))) / 2
+		end
 	elseif self.globalzoommode == self.ZOOM_FIT_TO_CONTENT_HEIGHT then
 		local x0, y0, x1, y1 = page:getUsedBBox()
-		self.globalzoom = height / (y1 - y0)
-		self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
-		self.offset_y = -1 * y0 * self.globalzoom
+		if (y1 - y0) < pheight then
+			self.globalzoom = height / (y1 - y0)
+			self.offset_x = -1 * x0 * self.globalzoom + (width - (self.globalzoom * (x1 - x0))) / 2
+			self.offset_y = -1 * y0 * self.globalzoom
+		end
 	end
 	dc:setZoom(self.globalzoom)
 	dc:setOffset(self.offset_x, self.offset_y)