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clamp rgb values to [0,1] #83

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Merged
merged 1 commit into from
Aug 4, 2015
Merged

clamp rgb values to [0,1] #83

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23 changes: 14 additions & 9 deletions src/color.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -314,35 +314,40 @@ fn parse_color_function(name: &str, arguments: &mut Parser) -> Result<Color, ()>
_ => return Err(())
};

fn clamp(val: f32) -> f32 {
val.max(0.).min(1.)
}

let red: f32;
let green: f32;
let blue: f32;
if is_rgb {
// Either integers or percentages, but all the same type.
match try!(arguments.next()) {
Token::Number(ref v) if v.int_value.is_some() => {
red = v.value / 255.;

red = clamp(v.value / 255.);
try!(arguments.expect_comma());
green = try!(arguments.expect_integer()) as f32 / 255.;
green = clamp(try!(arguments.expect_integer()) as f32 / 255.);
try!(arguments.expect_comma());
blue = try!(arguments.expect_integer()) as f32 / 255.;
blue = clamp(try!(arguments.expect_integer()) as f32 / 255.);
}
Token::Percentage(ref v) => {
red = v.unit_value;
red = clamp(v.unit_value);
try!(arguments.expect_comma());
green = try!(arguments.expect_percentage());
green = clamp(try!(arguments.expect_percentage()));
try!(arguments.expect_comma());
blue = try!(arguments.expect_percentage());
blue = clamp(try!(arguments.expect_percentage()));
}
_ => return Err(())
};
} else {
let hue = try!(arguments.expect_number()) / 360.;
let hue = hue - hue.floor();
try!(arguments.expect_comma());
let saturation = (try!(arguments.expect_percentage())).max(0.).min(1.);
let saturation = clamp(try!(arguments.expect_percentage()));
try!(arguments.expect_comma());
let lightness = (try!(arguments.expect_percentage())).max(0.).min(1.);
let lightness = clamp(try!(arguments.expect_percentage()));

// https://drafts.csswg.org/css-color/#hsl-color
fn hue_to_rgb(m1: f32, m2: f32, mut h: f32) -> f32 {
Expand All @@ -364,7 +369,7 @@ fn parse_color_function(name: &str, arguments: &mut Parser) -> Result<Color, ()>

let alpha = if has_alpha {
try!(arguments.expect_comma());
(try!(arguments.expect_number())).max(0.).min(1.)
clamp(try!(arguments.expect_number()))
} else {
1.
};
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4 changes: 2 additions & 2 deletions src/css-parsing-tests/color3.json
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,7 @@
"rgb(0,51,255)", [0, 0.2, 1, 1],
"rgb(0\t, 51 ,255)", [0, 0.2, 1, 1],
"rgb(/* R */0, /* G */51, /* B */255)", [0, 0.2, 1, 1],
"rgb(-51, 306, 0)", [-0.2, 1.2, 0, 1],
"rgb(-51, 306, 0)", [0, 1, 0, 1],

"rgb(42%, 3%, 50%)", [0.42, 0.03, 0.5, 1],
"RGB(100%, 100%, 100%)", [1, 1, 1, 1],
Expand All @@ -55,7 +55,7 @@
"rgb(10%,20%,30%)", [0.1, 0.2, 0.3, 1],
"rgb(10%\t, 20% ,30%)", [0.1, 0.2, 0.3, 1],
"rgb(/* R */ 10%, /* G */ 20%, /* B */ 30%)", [0.1, 0.2, 0.3, 1],
"rgb(-12%, 110%, 1400%)", [-0.12, 1.1, 14, 1],
"rgb(-12%, 110%, 1400%)", [0, 1, 1, 1],

"rgb(10%, 50%, 0)", null,
"rgb(255, 50%, 0%)", null,
Expand Down