CelOutputBuffer: Replace subregion with subregionY

We can't do anything with X yet

Source/engine.h

@@ -72,9 +72,12 @@ struct CelOutputBuffer {
 		return x >= 0 && y >= 0 && begin + x + line_width * y < end;
 	}
 
-	CelOutputBuffer subregion(int x0, int y0, int x1, int y1) const
+	/**
+	 * @brief Returns a buffer that starts at y0 and ends at y1.
+	 */
+	CelOutputBuffer subregionY(int y0, int y1) const
 	{
-		return CelOutputBuffer { at(x0, y0), std::min(at(x1, y1), end), line_width };
+		return CelOutputBuffer { at(0, y0), std::min(at(0, y1), end), line_width };
 	}
 #endif
 };

Source/minitext.cpp

@@ -146,7 +146,7 @@ void PrintQTextChr(int sx, int sy, Uint8 *pCelBuff, int nCel)
 {
 	CelOutputBuffer buf = GlobalBackBuffer();
 	const int start_y = 49 + SCREEN_Y + UI_OFFSET_Y;
-	buf = buf.subregion(0, start_y, buf.line_width, 309 + SCREEN_Y + UI_OFFSET_Y);
+	buf = buf.subregionY(start_y, 309 + SCREEN_Y + UI_OFFSET_Y);
 	CelDrawTo(buf, sx, sy - start_y, pCelBuff, nCel, 22);
 }
 

Source/scrollrt.cpp

@@ -1218,7 +1218,7 @@ void DrawView(CelOutputBuffer out, int StartX, int StartY)
 {
 	DrawGame(out, StartX, StartY);
 	if (automapflag) {
-		DrawAutomap(out.subregion(0, 0, out.line_width, SCREEN_Y + gnViewportHeight));
+		DrawAutomap(out.subregionY(0, SCREEN_Y + gnViewportHeight));
 	}
 	DrawMonsterHealthBar();