Fix out-of-bounds textures in [combine (#27)

api.lua

@@ -467,10 +467,11 @@ signs_lib.charwidth_wide32 = build_char_db(32)
 
 local math_max = math.max
 
-local function fill_line(x, y, w, c, font_size, colorbgw)
+local function fill_line(x, y, w, c, font_size, colorbgw, line_width)
 	c = c or "0"
 	local tex = { }
-	for xx = 0, math.max(0, w), colorbgw do
+	for xx = 0, w, colorbgw do
+		if x + xx > line_width then break end
 		table.insert(tex, (":%d,%d=signs_lib_color_"..font_size.."px_%s.png"):format(x + xx, y, c))
 	end
 	return table.concat(tex)
@@ -583,9 +584,10 @@ local function make_line_texture(line, lineno, pos, line_width, line_height, cwi
 					end
 				end
 				if w then
-					width = width + w + 1
+					width = width + w
 					if width >= (line_width - cwidth_tab[" "]) then
 						width = 0
+						break
 					else
 						maxw = math_max(width, maxw)
 					end
@@ -615,9 +617,10 @@ local function make_line_texture(line, lineno, pos, line_width, line_height, cwi
 			else
 				local w = cwidth_tab[c]
 				if w then
-					width = width + w + 1
+					width = width + w
 					if width >= (line_width - cwidth_tab[" "]) then
 						width = 0
+						break
 					else
 						maxw = math_max(width, maxw)
 					end
@@ -633,7 +636,7 @@ local function make_line_texture(line, lineno, pos, line_width, line_height, cwi
 			end
 			i = i + 1
 		end
-		width = width + cwidth_tab[" "] + 1
+		width = width + cwidth_tab[" "]
 		maxw = math_max(width, maxw)
 		table.insert(words, { chars=chars, w=ch_offs })
 	end
@@ -652,17 +655,16 @@ local function make_line_texture(line, lineno, pos, line_width, line_height, cwi
 	for word_i, word in ipairs(words) do
 		local xoffs = (xpos - start_xpos)
 		if (xoffs > 0) and ((xoffs + word.w) > maxw) then
-			table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw))
 			xpos = start_xpos
 			ypos = ypos + line_height + def.line_spacing
 			lineno = lineno + 1
 			if lineno >= def.number_of_lines then break end
-			table.insert(texture, fill_line(xpos, ypos, maxw, cur_color, font_size, colorbgw))
+			table.insert(texture, fill_line(xpos, ypos, maxw, cur_color, font_size, colorbgw, line_width))
 		end
 		for ch_i, ch in ipairs(word.chars) do
 			if ch.col ~= cur_color then
 				cur_color = ch.col
-				table.insert(texture, fill_line(xpos + ch.off, ypos, maxw, cur_color, font_size, colorbgw))
+				table.insert(texture, fill_line(xpos + ch.off, ypos, maxw, cur_color, font_size, colorbgw, line_width))
 			end
 			table.insert(texture, (":%d,%d=%s"):format(xpos + ch.off, ypos, ch.tex))
 		end
@@ -671,11 +673,9 @@ local function make_line_texture(line, lineno, pos, line_width, line_height, cwi
 			(":%d,%d="):format(xpos + word.w, ypos) .. char_tex(font_name, " ")
 		)
 		xpos = xpos + word.w + cwidth_tab[" "]
-		if xpos >= (line_width + cwidth_tab[" "]) then break end
 	end
-
-	table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw))
-	table.insert(texture, fill_line(start_xpos, ypos + line_height, maxw, "n", font_size, colorbgw))
+	table.insert(texture, fill_line(xpos, ypos, maxw, "n", font_size, colorbgw, line_width))
+	table.insert(texture, fill_line(start_xpos, ypos + line_height, maxw, "n", font_size, colorbgw, line_width))
 
 	return table.concat(texture), lineno
 end