Don't tint if colors are default

benches/rendering.rs

@@ -24,7 +24,7 @@ const FILES: [&str; 3] = [
 ];
 
 const BLACK: i32 = 0;
-const WHITE: i32 = 1000;
+const WHITE: i32 = i32::from_be_bytes([0, 0xff, 0xff, 0xff]);
 
 fn render_full(c: &mut Criterion) {
 	for file in FILES {

src/main.rs

@@ -309,6 +309,7 @@ fn on_notify_ev(
 		}
 	}
 }
+
 fn parse_color_to_i32(cs: &str) -> Result<i32, csscolorparser::ParseColorError> {
 	let color = csscolorparser::parse(cs)?;
 	let [r, g, b, _] = color.to_rgba8();

src/renderer.rs

@@ -52,6 +52,9 @@ struct PrevRender {
 	num_search_found: Option<usize>
 }
 
+const MUPDF_BLACK: i32 = 0;
+const MUPDF_WHITE: i32 = i32::from_be_bytes([0, 0xff, 0xff, 0xff]);
+
 #[inline]
 pub fn fill_default<T: Default>(vec: &mut Vec<T>, size: usize) {
 	vec.clear();
@@ -468,7 +471,7 @@ fn render_single_page_to_ctx(
 	let mut pixmap = page.to_pixmap(&matrix, &colorspace, false, false)?;
 	if invert {
 		pixmap.tint(white, black)?;
-	} else {
+	} else if black != MUPDF_BLACK || white != MUPDF_WHITE {
 		pixmap.tint(black, white)?;
 	}