Grcov report - filter

1

//! SVG2 filter function shortcuts - `blur()`, `brightness()`, etc.

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//!

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//! The `<filter>` element from SVG1.1 (also present in SVG2) uses some verbose XML to

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//! define chains of filter primitives.  In SVG2, there is a shortcut form of the `filter`

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//! attribute and property, where one can simply say `filter="blur(5)"` and get the

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//! equivalent of writing a full `<filter>` with a `<feGaussianBlur>` element.

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//!

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//! This module has a type for each of the filter functions in SVG2 with the function's

9

//! parameters, for example [`Blur`] stores the blur's standard deviation parameter.

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//!

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//! Those types get aggregated in the [`FilterFunction`] enum.  A [`FilterFunction`] can

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//! then convert itself into a [`FilterSpec`], which is ready to be rendered on a surface.

13

14

use cssparser::{Color, Parser};

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16

use crate::angle::Angle;

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use crate::error::*;

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use crate::filter::Filter;

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use crate::filters::{

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    color_matrix::ColorMatrix,

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    component_transfer::{self, FeFuncA, FeFuncB, FeFuncCommon, FeFuncG, FeFuncR},

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    composite::{Composite, Operator},

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    flood::Flood,

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    gaussian_blur::GaussianBlur,

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    merge::{Merge, MergeNode},

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    offset::Offset,

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    FilterSpec, Input, Primitive, PrimitiveParams, ResolvedPrimitive, UserSpacePrimitive,

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};

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use crate::length::*;

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use crate::paint_server::resolve_color;

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use crate::parsers::{CustomIdent, NumberOptionalNumber, NumberOrPercentage, Parse};

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use crate::unit_interval::UnitInterval;

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/// CSS Filter functions from the Filter Effects Module Level 1

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#filter-functions>

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150

#[derive(Debug, Clone, PartialEq)]

38

pub enum FilterFunction {

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20

    Blur(Blur),

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8

    Brightness(Brightness),

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8

    Contrast(Contrast),

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11

    DropShadow(DropShadow),

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8

    Grayscale(Grayscale),

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9

    HueRotate(HueRotate),

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8

    Invert(Invert),

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32

    Opacity(Opacity),

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8

    Saturate(Saturate),

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11

    Sepia(Sepia),

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/// Parameters for the `blur()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-blur>

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40

#[derive(Debug, Clone, PartialEq)]

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pub struct Blur {

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20

    std_deviation: Option<Length<Both>>,

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/// Parameters for the `brightness()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-brightness>

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16

#[derive(Debug, Clone, PartialEq)]

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pub struct Brightness {

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8

    proportion: Option<f64>,

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/// Parameters for the `contrast()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-contrast>

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16

#[derive(Debug, Clone, PartialEq)]

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pub struct Contrast {

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8

    proportion: Option<f64>,

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/// Parameters for the `drop-shadow()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-drop-shadow>

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22

#[derive(Debug, Clone, PartialEq)]

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pub struct DropShadow {

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11

    color: Option<Color>,

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11

    dx: Option<Length<Horizontal>>,

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11

    dy: Option<Length<Vertical>>,

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    std_deviation: Option<ULength<Both>>,

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/// Parameters for the `grayscale()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-grayscale>

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16

#[derive(Debug, Clone, PartialEq)]

90

pub struct Grayscale {

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8

    proportion: Option<f64>,

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/// Parameters for the `hue-rotate()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-huerotate>

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18

#[derive(Debug, Clone, PartialEq)]

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pub struct HueRotate {

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9

    angle: Option<Angle>,

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/// Parameters for the `invert()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-invert>

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#[derive(Debug, Clone, PartialEq)]

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pub struct Invert {

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8

    proportion: Option<f64>,

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/// Parameters for the `opacity()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-opacity>

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64

#[derive(Debug, Clone, PartialEq)]

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pub struct Opacity {

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32

    proportion: Option<f64>,

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/// Parameters for the `saturate()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-saturate>

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16

#[derive(Debug, Clone, PartialEq)]

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pub struct Saturate {

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8

    proportion: Option<f64>,

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/// Parameters for the `sepia()` filter function

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///

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/// Filter Effects 1: <https://www.w3.org/TR/filter-effects/#funcdef-filter-sepia>

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22

#[derive(Debug, Clone, PartialEq)]

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pub struct Sepia {

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11

    proportion: Option<f64>,

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/// Reads an optional number or percentage from the parser.

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/// Negative numbers are not allowed.

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35

fn parse_num_or_percentage(parser: &mut Parser<'_, '_>) -> Option<f64> {

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    match parser.try_parse(|p| NumberOrPercentage::parse(p)) {

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        Ok(NumberOrPercentage { value }) if value < 0.0 => None,

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        Ok(NumberOrPercentage { value }) => Some(value),

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        Err(_) => None,

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35

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/// Reads an optional number or percentage from the parser, returning a value clamped to [0, 1].

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/// Negative numbers are not allowed.

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23

fn parse_num_or_percentage_clamped(parser: &mut Parser<'_, '_>) -> Option<f64> {

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    parse_num_or_percentage(parser).map(|value| value.clamp(0.0, 1.0))

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23

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3365

fn parse_function<'i, F>(

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    parser: &mut Parser<'i, '_>,

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    name: &str,

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    f: F,

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) -> Result<FilterFunction, ParseError<'i>>

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where

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    F: for<'tt> FnOnce(&mut Parser<'i, 'tt>) -> Result<FilterFunction, ParseError<'i>>,

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3365

    parser.expect_function_matching(name)?;

159

57

    parser.parse_nested_block(f)

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3363

161

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// This function doesn't fail, but returns a Result like the other parsers, so tell Clippy

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// about that.

164

#[allow(clippy::unnecessary_wraps)]

165

7

fn parse_blur<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

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14

    let length = parser.try_parse(|p| Length::parse(p)).ok();

167

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7

    Ok(FilterFunction::Blur(Blur {

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        std_deviation: length,

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}))

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7

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#[allow(clippy::unnecessary_wraps)]

174

4

fn parse_brightness<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

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4

    let proportion = parse_num_or_percentage(parser);

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    Ok(FilterFunction::Brightness(Brightness { proportion }))

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4

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#[allow(clippy::unnecessary_wraps)]

181

4

fn parse_contrast<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

182

4

    let proportion = parse_num_or_percentage(parser);

183

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4

    Ok(FilterFunction::Contrast(Contrast { proportion }))

185

4

186

#[allow(clippy::unnecessary_wraps)]

187

10

fn parse_dropshadow<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

188

10

    let mut result = DropShadow {

189

10

        color: None,

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10

        dx: None,

191

10

        dy: None,

192

10

        std_deviation: None,

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};

194

195

10

    result.color = parser.try_parse(Color::parse).ok();

196

197

    // if dx is provided, dy must follow and an optional std_dev must follow that.

198

18

    if let Ok(dx) = parser.try_parse(Length::parse) {

199

10

        result.dx = Some(dx);

200

10

        result.dy = Some(parser.try_parse(Length::parse)?);

201

8

        result.std_deviation = parser.try_parse(ULength::parse).ok();

202

10

203

204

8

    let loc = parser.current_source_location();

205

206

    // because the color and length arguments can be provided in either order,

207

    // check again after potentially parsing lengths if the color is now provided.

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    // if a color is provided both before and after, that is an error.

209

10

    if let Ok(c) = parser.try_parse(Color::parse) {

210

3

        if result.color.is_some() {

211

1

            return Err(

212

1

                loc.new_custom_error(ValueErrorKind::Value("color already specified".to_string()))

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);

214

        } else {

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2

            result.color = Some(c);

216

217

8

218

219

7

    Ok(FilterFunction::DropShadow(result))

220

10

221

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#[allow(clippy::unnecessary_wraps)]

223

4

fn parse_grayscale<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

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4

    let proportion = parse_num_or_percentage_clamped(parser);

225

226

4

    Ok(FilterFunction::Grayscale(Grayscale { proportion }))

227

4

228

229

#[allow(clippy::unnecessary_wraps)]

230

5

fn parse_huerotate<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

231

10

    let angle = parser.try_parse(|p| Angle::parse(p)).ok();

232

233

5

    Ok(FilterFunction::HueRotate(HueRotate { angle }))

234

5

235

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#[allow(clippy::unnecessary_wraps)]

237

4

fn parse_invert<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

238

4

    let proportion = parse_num_or_percentage_clamped(parser);

239

240

4

    Ok(FilterFunction::Invert(Invert { proportion }))

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4

242

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#[allow(clippy::unnecessary_wraps)]

244

8

fn parse_opacity<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

245

8

    let proportion = parse_num_or_percentage_clamped(parser);

246

247

8

    Ok(FilterFunction::Opacity(Opacity { proportion }))

248

8

249

250

#[allow(clippy::unnecessary_wraps)]

251

4

fn parse_saturate<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

252

4

    let proportion = parse_num_or_percentage(parser);

253

254

4

    Ok(FilterFunction::Saturate(Saturate { proportion }))

255

4

256

257

#[allow(clippy::unnecessary_wraps)]

258

7

fn parse_sepia<'i>(parser: &mut Parser<'i, '_>) -> Result<FilterFunction, ParseError<'i>> {

259

7

    let proportion = parse_num_or_percentage_clamped(parser);

260

261

7

    Ok(FilterFunction::Sepia(Sepia { proportion }))

262

7

263

264

impl Blur {

265

3

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

266

        // The 0.0 default is from the spec

267

6

        let std_dev = self.std_deviation.map(|l| l.to_user(params)).unwrap_or(0.0);

268

269

3

        let user_space_filter = Filter::default().to_user_space(params);

270

271

3

        let gaussian_blur = ResolvedPrimitive {

272

3

            primitive: Primitive::default(),

273

3

            params: PrimitiveParams::GaussianBlur(GaussianBlur {

274

3

                std_deviation: NumberOptionalNumber(std_dev, std_dev),

275

3

                ..GaussianBlur::default()

276

}),

277

278

3

        .into_user_space(params);

279

280

3

        FilterSpec {

281

3

            name: "blur()".to_string(),

282

            user_space_filter,

283

3

            primitives: vec![gaussian_blur],

284

285

3

286

287

288

impl Brightness {

289

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

290

1

        let user_space_filter = Filter::default().to_user_space(params);

291

1

        let slope = self.proportion.unwrap_or(1.0);

292

293

1

        let brightness = ResolvedPrimitive {

294

1

            primitive: Primitive::default(),

295

1

            params: PrimitiveParams::ComponentTransfer(component_transfer::ComponentTransfer {

296

1

                functions: component_transfer::Functions {

297

1

                    r: FeFuncR(FeFuncCommon {

298

1

                        function_type: component_transfer::FunctionType::Linear,

299

                        slope,

300

1

                        ..FeFuncCommon::default()

301

}),

302

1

                    g: FeFuncG(FeFuncCommon {

303

1

                        function_type: component_transfer::FunctionType::Linear,

304

                        slope,

305

1

                        ..FeFuncCommon::default()

306

}),

307

1

                    b: FeFuncB(FeFuncCommon {

308

1

                        function_type: component_transfer::FunctionType::Linear,

309

                        slope,

310

1

                        ..FeFuncCommon::default()

311

}),

312

1

                    a: FeFuncA::default(),

313

},

314

1

                ..component_transfer::ComponentTransfer::default()

315

}),

316

317

1

        .into_user_space(params);

318

319

1

        FilterSpec {

320

1

            name: "brightness()".to_string(),

321

            user_space_filter,

322

1

            primitives: vec![brightness],

323

324

1

325

326

327

impl Contrast {

328

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

329

1

        let user_space_filter = Filter::default().to_user_space(params);

330

1

        let slope = self.proportion.unwrap_or(1.0);

331

1

        let intercept = -(0.5 * slope) + 0.5;

332

333

1

        let contrast = ResolvedPrimitive {

334

1

            primitive: Primitive::default(),

335

1

            params: PrimitiveParams::ComponentTransfer(component_transfer::ComponentTransfer {

336

1

                functions: component_transfer::Functions {

337

1

                    r: FeFuncR(FeFuncCommon {

338

1

                        function_type: component_transfer::FunctionType::Linear,

339

                        slope,

340

                        intercept,

341

1

                        ..FeFuncCommon::default()

342

}),

343

1

                    g: FeFuncG(FeFuncCommon {

344

1

                        function_type: component_transfer::FunctionType::Linear,

345

                        slope,

346

                        intercept,

347

1

                        ..FeFuncCommon::default()

348

}),

349

1

                    b: FeFuncB(FeFuncCommon {

350

1

                        function_type: component_transfer::FunctionType::Linear,

351

                        slope,

352

                        intercept,

353

1

                        ..FeFuncCommon::default()

354

}),

355

1

                    a: FeFuncA::default(),

356

},

357

1

                ..component_transfer::ComponentTransfer::default()

358

}),

359

360

1

        .into_user_space(params);

361

362

1

        FilterSpec {

363

1

            name: "contrast()".to_string(),

364

            user_space_filter,

365

1

            primitives: vec![contrast],

366

367

1

368

369

370

/// Creates the filter primitives required for a `feDropShadow` effect.

371

///

372

/// Both the `drop-shadow()` filter function and the `feDropShadow` element need to create

373

/// a sequence of filter primitives (blur, offset, etc.) to build the drop shadow.  This

374

/// function builds that sequence.

375

2

pub fn drop_shadow_primitives(

376

    dx: f64,

377

    dy: f64,

378

    std_deviation: NumberOptionalNumber<f64>,

379

    color: Color,

380

) -> Vec<ResolvedPrimitive> {

381

2

    let offsetblur = CustomIdent("offsetblur".to_string());

382

383

2

    let gaussian_blur = ResolvedPrimitive {

384

2

        primitive: Primitive::default(),

385

2

        params: PrimitiveParams::GaussianBlur(GaussianBlur {

386

2

            in1: Input::SourceAlpha,

387

            std_deviation,

388

2

            ..GaussianBlur::default()

389

}),

390

2

};

391

392

2

    let offset = ResolvedPrimitive {

393

2

        primitive: Primitive {

394

2

            result: Some(offsetblur.clone()),

395

2

            ..Primitive::default()

396

},

397

2

        params: PrimitiveParams::Offset(Offset {

398

2

            in1: Input::default(),

399

dx,

400

dy,

401

}),

402

2

};

403

404

2

    let flood = ResolvedPrimitive {

405

2

        primitive: Primitive::default(),

406

2

        params: PrimitiveParams::Flood(Flood { color }),

407

};

408

409

2

    let composite = ResolvedPrimitive {

410

2

        primitive: Primitive::default(),

411

2

        params: PrimitiveParams::Composite(Composite {

412

2

            in2: Input::FilterOutput(offsetblur),

413

2

            operator: Operator::In,

414

2

            ..Composite::default()

415

}),

416

2

};

417

418

2

    let merge = ResolvedPrimitive {

419

2

        primitive: Primitive::default(),

420

2

        params: PrimitiveParams::Merge(Merge {

421

4

            merge_nodes: vec![

422

2

                MergeNode::default(),

423

2

                MergeNode {

424

2

                    in1: Input::SourceGraphic,

425

2

                    ..MergeNode::default()

426

},

427

],

428

}),

429

2

};

430

431

2

    vec![gaussian_blur, offset, flood, composite, merge]

432

2

433

434

impl DropShadow {

435

    /// Converts a DropShadow into the set of filter element primitives.

436

///

437

    /// See <https://www.w3.org/TR/filter-effects/#dropshadowEquivalent>.

438

1

    fn to_filter_spec(&self, params: &NormalizeParams, default_color: Color) -> FilterSpec {

439

1

        let user_space_filter = Filter::default().to_user_space(params);

440

2

        let dx = self.dx.map(|l| l.to_user(params)).unwrap_or(0.0);

441

2

        let dy = self.dy.map(|l| l.to_user(params)).unwrap_or(0.0);

442

2

        let std_dev = self.std_deviation.map(|l| l.to_user(params)).unwrap_or(0.0);

443

1

        let std_deviation = NumberOptionalNumber(std_dev, std_dev);

444

3

        let color = self

445

            .color

446

            .as_ref()

447

2

            .map(|c| resolve_color(c, UnitInterval::clamp(1.0), &default_color))

448

1

            .unwrap_or(default_color);

449

450

1

        let resolved_primitives = drop_shadow_primitives(dx, dy, std_deviation, color);

451

452

2

        let primitives = resolved_primitives

453

            .into_iter()

454

6

            .map(|p| p.into_user_space(params))

455

            .collect();

456

457

1

        FilterSpec {

458

1

            name: "drop-shadow()".to_string(),

459

            user_space_filter,

460

1

            primitives,

461

462

1

463

464

465

impl Grayscale {

466

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

467

        // grayscale is implemented as the inverse of a saturate operation,

468

        // with the input clamped to the range [0, 1] by the parser.

469

1

        let p = 1.0 - self.proportion.unwrap_or(1.0);

470

1

        let saturate = Saturate {

471

1

            proportion: Some(p),

472

};

473

474

1

        let user_space_filter = Filter::default().to_user_space(params);

475

1

        let primitive = saturate.to_user_space_primitive(params);

476

477

1

        FilterSpec {

478

1

            name: "grayscale".to_string(),

479

            user_space_filter,

480

1

            primitives: vec![primitive],

481

482

1

483

484

485

impl HueRotate {

486

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

487

2

        let rads = self.angle.map(|a| a.radians()).unwrap_or(0.0);

488

1

        let user_space_filter = Filter::default().to_user_space(params);

489

490

1

        let huerotate = ResolvedPrimitive {

491

1

            primitive: Primitive::default(),

492

1

            params: PrimitiveParams::ColorMatrix(ColorMatrix {

493

1

                matrix: ColorMatrix::hue_rotate_matrix(rads),

494

1

                ..ColorMatrix::default()

495

}),

496

497

1

        .into_user_space(params);

498

499

1

        FilterSpec {

500

1

            name: "hue-rotate".to_string(),

501

            user_space_filter,

502

1

            primitives: vec![huerotate],

503

504

1

505

506

507

impl Invert {

508

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

509

1

        let p = self.proportion.unwrap_or(1.0);

510

1

        let user_space_filter = Filter::default().to_user_space(params);

511

512

1

        let invert = ResolvedPrimitive {

513

1

            primitive: Primitive::default(),

514

1

            params: PrimitiveParams::ComponentTransfer(component_transfer::ComponentTransfer {

515

1

                functions: component_transfer::Functions {

516

1

                    r: FeFuncR(FeFuncCommon {

517

1

                        function_type: component_transfer::FunctionType::Table,

518

1

                        table_values: vec![p, 1.0 - p],

519

1

                        ..FeFuncCommon::default()

520

}),

521

1

                    g: FeFuncG(FeFuncCommon {

522

1

                        function_type: component_transfer::FunctionType::Table,

523

1

                        table_values: vec![p, 1.0 - p],

524

1

                        ..FeFuncCommon::default()

525

}),

526

1

                    b: FeFuncB(FeFuncCommon {

527

1

                        function_type: component_transfer::FunctionType::Table,

528

1

                        table_values: vec![p, 1.0 - p],

529

1

                        ..FeFuncCommon::default()

530

}),

531

1

                    a: FeFuncA::default(),

532

},

533

1

                ..component_transfer::ComponentTransfer::default()

534

}),

535

536

1

        .into_user_space(params);

537

538

1

        FilterSpec {

539

1

            name: "invert".to_string(),

540

            user_space_filter,

541

1

            primitives: vec![invert],

542

543

1

544

545

546

impl Opacity {

547

5

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

548

5

        let p = self.proportion.unwrap_or(1.0);

549

5

        let user_space_filter = Filter::default().to_user_space(params);

550

551

5

        let opacity = ResolvedPrimitive {

552

5

            primitive: Primitive::default(),

553

5

            params: PrimitiveParams::ComponentTransfer(component_transfer::ComponentTransfer {

554

5

                functions: component_transfer::Functions {

555

5

                    a: FeFuncA(FeFuncCommon {

556

5

                        function_type: component_transfer::FunctionType::Table,

557

5

                        table_values: vec![0.0, p],

558

5

                        ..FeFuncCommon::default()

559

}),

560

5

                    ..component_transfer::Functions::default()

561

},

562

5

                ..component_transfer::ComponentTransfer::default()

563

}),

564

565

5

        .into_user_space(params);

566

567

5

        FilterSpec {

568

5

            name: "opacity".to_string(),

569

            user_space_filter,

570

5

            primitives: vec![opacity],

571

572

5

573

574

575

impl Saturate {

576

    #[rustfmt::skip]

577

2

    fn matrix(&self) -> nalgebra::Matrix5<f64> {

578

2

        let p = self.proportion.unwrap_or(1.0);

579

580

2

        nalgebra::Matrix5::new(

581

2

            0.213 + 0.787 * p, 0.715 - 0.715 * p, 0.072 - 0.072 * p, 0.0, 0.0,

582

2

            0.213 - 0.213 * p, 0.715 + 0.285 * p, 0.072 - 0.072 * p, 0.0, 0.0,

583

2

            0.213 - 0.213 * p, 0.715 - 0.715 * p, 0.072 + 0.928 * p, 0.0, 0.0,

584

            0.0,               0.0,               0.0,               1.0, 0.0,

585

            0.0,               0.0,               0.0,               0.0, 1.0,

586

587

2

588

589

2

    fn to_user_space_primitive(&self, params: &NormalizeParams) -> UserSpacePrimitive {

590

2

        ResolvedPrimitive {

591

2

            primitive: Primitive::default(),

592

2

            params: PrimitiveParams::ColorMatrix(ColorMatrix {

593

2

                matrix: self.matrix(),

594

2

                ..ColorMatrix::default()

595

}),

596

597

        .into_user_space(params)

598

2

599

600

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

601

1

        let user_space_filter = Filter::default().to_user_space(params);

602

603

1

        let saturate = self.to_user_space_primitive(params);

604

605

1

        FilterSpec {

606

1

            name: "saturate".to_string(),

607

            user_space_filter,

608

1

            primitives: vec![saturate],

609

610

1

611

612

613

impl Sepia {

614

    #[rustfmt::skip]

615

1

    fn matrix(&self) -> nalgebra::Matrix5<f64> {

616

1

        let p = self.proportion.unwrap_or(1.0);

617

618

1

        nalgebra::Matrix5::new(

619

1

            0.393 + 0.607 * (1.0 - p), 0.769 - 0.769 * (1.0 - p), 0.189 - 0.189 * (1.0 - p), 0.0, 0.0,

620

1

            0.349 - 0.349 * (1.0 - p), 0.686 + 0.314 * (1.0 - p), 0.168 - 0.168 * (1.0 - p), 0.0, 0.0,

621

1

            0.272 - 0.272 * (1.0 - p), 0.534 - 0.534 * (1.0 - p), 0.131 + 0.869 * (1.0 - p), 0.0, 0.0,

622

            0.0,                       0.0,                       0.0,                       1.0, 0.0,

623

            0.0,                       0.0,                       0.0,                       0.0, 1.0,

624

625

1

626

627

1

    fn to_filter_spec(&self, params: &NormalizeParams) -> FilterSpec {

628

1

        let user_space_filter = Filter::default().to_user_space(params);

629

630

1

        let sepia = ResolvedPrimitive {

631

1

            primitive: Primitive::default(),

632

1

            params: PrimitiveParams::ColorMatrix(ColorMatrix {

633

1

                matrix: self.matrix(),

634

1

                ..ColorMatrix::default()

635

}),

636

637

1

        .into_user_space(params);

638

639

1

        FilterSpec {

640

1

            name: "sepia".to_string(),

641

            user_space_filter,

642

1

            primitives: vec![sepia],

643

644

1

645

646

647

impl Parse for FilterFunction {

648

    #[allow(clippy::type_complexity)]

649

    #[rustfmt::skip]

650

6959

    fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<Self, crate::error::ParseError<'i>> {

651

6959

        let loc = parser.current_source_location();

652

13918

        let fns: Vec<(&str, &dyn Fn(&mut Parser<'i, '_>) -> _)> = vec![

653

6959

            ("blur",        &parse_blur),

654

6959

            ("brightness",  &parse_brightness),

655

6959

            ("contrast",    &parse_contrast),

656

6959

            ("drop-shadow", &parse_dropshadow),

657

6959

            ("grayscale",   &parse_grayscale),

658

6959

            ("hue-rotate",  &parse_huerotate),

659

6959

            ("invert",      &parse_invert),

660

6959

            ("opacity",     &parse_opacity),

661

6959

            ("saturate",    &parse_saturate),

662

6959

            ("sepia",       &parse_sepia),

663

];

664

665

10350

        for (filter_name, parse_fn) in fns {

666

10041

            if let Ok(func) = parser.try_parse(|p| parse_function(p, filter_name, parse_fn)) {

667

43

                return Ok(func);

668

669

3343

670

671

312

        return Err(loc.new_custom_error(ValueErrorKind::parse_error("expected filter function")));

672

355

673

674

675

impl FilterFunction {

676

    // If this function starts actually returning an Err, remove this Clippy exception:

677

    #[allow(clippy::unnecessary_wraps)]

678

16

    pub fn to_filter_spec(&self, params: &NormalizeParams, current_color: Color) -> FilterSpec {

679

16

        match self {

680

3

            FilterFunction::Blur(v) => v.to_filter_spec(params),

681

1

            FilterFunction::Brightness(v) => v.to_filter_spec(params),

682

1

            FilterFunction::Contrast(v) => v.to_filter_spec(params),

683

1

            FilterFunction::DropShadow(v) => v.to_filter_spec(params, current_color),

684

1

            FilterFunction::Grayscale(v) => v.to_filter_spec(params),

685

1

            FilterFunction::HueRotate(v) => v.to_filter_spec(params),

686

1

            FilterFunction::Invert(v) => v.to_filter_spec(params),

687

5

            FilterFunction::Opacity(v) => v.to_filter_spec(params),

688

1

            FilterFunction::Saturate(v) => v.to_filter_spec(params),

689

1

            FilterFunction::Sepia(v) => v.to_filter_spec(params),

690

691

16

692

693

694

#[cfg(test)]

695

mod tests {

696

    use cssparser::RGBA;

697

698

    use super::*;

699

700

    #[test]

701

2

    fn parses_blur() {

702

1

        assert_eq!(

703

1

            FilterFunction::parse_str("blur()").unwrap(),

704

            FilterFunction::Blur(Blur {

705

                std_deviation: None

706

})

707

);

708

709

1

        assert_eq!(

710

1

            FilterFunction::parse_str("blur(5px)").unwrap(),

711

1

            FilterFunction::Blur(Blur {

712

1

                std_deviation: Some(Length::new(5.0, LengthUnit::Px))

713

})

714

);

715

2

716

717

    #[test]

718

2

    fn parses_brightness() {

719

1

        assert_eq!(

720

1

            FilterFunction::parse_str("brightness()").unwrap(),

721

            FilterFunction::Brightness(Brightness { proportion: None })

722

);

723

724

1

        assert_eq!(

725

1

            FilterFunction::parse_str("brightness(50%)").unwrap(),

726

1

            FilterFunction::Brightness(Brightness {

727

1

                proportion: Some(0.50_f32.into()),

728

})

729

);

730

2

731

732

    #[test]

733

2

    fn parses_contrast() {

734

1

        assert_eq!(

735

1

            FilterFunction::parse_str("contrast()").unwrap(),

736

            FilterFunction::Contrast(Contrast { proportion: None })

737

);

738

739

1

        assert_eq!(

740

1

            FilterFunction::parse_str("contrast(50%)").unwrap(),

741

1

            FilterFunction::Contrast(Contrast {

742

1

                proportion: Some(0.50_f32.into()),

743

})

744

);

745

2

746

747

    #[test]

748

2

    fn parses_dropshadow() {

749

1

        assert_eq!(

750

1

            FilterFunction::parse_str("drop-shadow(4px 5px)").unwrap(),

751

1

            FilterFunction::DropShadow(DropShadow {

752

1

                color: None,

753

1

                dx: Some(Length::new(4.0, LengthUnit::Px)),

754

1

                dy: Some(Length::new(5.0, LengthUnit::Px)),

755

1

                std_deviation: None,

756

})

757

);

758

759

1

        assert_eq!(

760

1

            FilterFunction::parse_str("drop-shadow(#ff0000 4px 5px 32px)").unwrap(),

761

1

            FilterFunction::DropShadow(DropShadow {

762

1

                color: Some(Color::Rgba(RGBA {

763

1

                    red: Some(255),

764

1

                    green: Some(0),

765

1

                    blue: Some(0),

766

1

                    alpha: Some(1.0)

767

                })),

768

1

                dx: Some(Length::new(4.0, LengthUnit::Px)),

769

1

                dy: Some(Length::new(5.0, LengthUnit::Px)),

770

1

                std_deviation: Some(ULength::new(32.0, LengthUnit::Px)),

771

})

772

);

773

774

1

        assert_eq!(

775

1

            FilterFunction::parse_str("drop-shadow(1px 2px blue)").unwrap(),

776

1

            FilterFunction::DropShadow(DropShadow {

777

1

                color: Some(Color::Rgba(RGBA {

778

1

                    red: Some(0),

779

1

                    green: Some(0),

780

1

                    blue: Some(255),

781

1

                    alpha: Some(1.0)

782

                })),

783

1

                dx: Some(Length::new(1.0, LengthUnit::Px)),

784

1

                dy: Some(Length::new(2.0, LengthUnit::Px)),

785

1

                std_deviation: None,

786

})

787

);

788

789

1

        assert_eq!(

790

1

            FilterFunction::parse_str("drop-shadow(1px 2px 3px currentColor)").unwrap(),

791

1

            FilterFunction::DropShadow(DropShadow {

792

1

                color: Some(Color::CurrentColor),

793

1

                dx: Some(Length::new(1.0, LengthUnit::Px)),

794

1

                dy: Some(Length::new(2.0, LengthUnit::Px)),

795

1

                std_deviation: Some(ULength::new(3.0, LengthUnit::Px)),

796

})

797

);

798

799

1

        assert_eq!(

800

1

            FilterFunction::parse_str("drop-shadow(1 2 3)").unwrap(),

801

1

            FilterFunction::DropShadow(DropShadow {

802

1

                color: None,

803

1

                dx: Some(Length::new(1.0, LengthUnit::Px)),

804

1

                dy: Some(Length::new(2.0, LengthUnit::Px)),

805

1

                std_deviation: Some(ULength::new(3.0, LengthUnit::Px)),

806

})

807

);

808

2

809

810

    #[test]

811

2

    fn parses_grayscale() {

812

1

        assert_eq!(

813

1

            FilterFunction::parse_str("grayscale()").unwrap(),

814

            FilterFunction::Grayscale(Grayscale { proportion: None })

815

);

816

817

1

        assert_eq!(

818

1

            FilterFunction::parse_str("grayscale(50%)").unwrap(),

819

1

            FilterFunction::Grayscale(Grayscale {

820

1

                proportion: Some(0.50_f32.into()),

821

})

822

);

823

2

824

825

    #[test]

826

2

    fn parses_huerotate() {

827

1

        assert_eq!(

828

1

            FilterFunction::parse_str("hue-rotate()").unwrap(),

829

            FilterFunction::HueRotate(HueRotate { angle: None })

830

);

831

832

1

        assert_eq!(

833

1

            FilterFunction::parse_str("hue-rotate(0)").unwrap(),

834

1

            FilterFunction::HueRotate(HueRotate {

835

1

                angle: Some(Angle::new(0.0))

836

})

837

);

838

839

1

        assert_eq!(

840

1

            FilterFunction::parse_str("hue-rotate(128deg)").unwrap(),

841

1

            FilterFunction::HueRotate(HueRotate {

842

1

                angle: Some(Angle::from_degrees(128.0))

843

})

844

);

845

2

846

847

    #[test]

848

2

    fn parses_invert() {

849

1

        assert_eq!(

850

1

            FilterFunction::parse_str("invert()").unwrap(),

851

            FilterFunction::Invert(Invert { proportion: None })

852

);

853

854

1

        assert_eq!(

855

1

            FilterFunction::parse_str("invert(50%)").unwrap(),

856

1

            FilterFunction::Invert(Invert {

857

1

                proportion: Some(0.50_f32.into()),

858

})

859

);

860

2

861

862

    #[test]

863

2

    fn parses_opacity() {

864

1

        assert_eq!(

865

1

            FilterFunction::parse_str("opacity()").unwrap(),

866

            FilterFunction::Opacity(Opacity { proportion: None })

867

);

868

869

1

        assert_eq!(

870

1

            FilterFunction::parse_str("opacity(50%)").unwrap(),

871

1

            FilterFunction::Opacity(Opacity {

872

1

                proportion: Some(0.50_f32.into()),

873

})

874

);

875

2

876

877

    #[test]

878

2

    fn parses_saturate() {

879

1

        assert_eq!(

880

1

            FilterFunction::parse_str("saturate()").unwrap(),

881

            FilterFunction::Saturate(Saturate { proportion: None })

882

);

883

884

1

        assert_eq!(

885

1

            FilterFunction::parse_str("saturate(50%)").unwrap(),

886

1

            FilterFunction::Saturate(Saturate {

887

1

                proportion: Some(0.50_f32.into()),

888

})

889

);

890

2

891

892

    #[test]

893

2

    fn parses_sepia() {

894

1

        assert_eq!(

895

1

            FilterFunction::parse_str("sepia()").unwrap(),

896

            FilterFunction::Sepia(Sepia { proportion: None })

897

);

898

899

1

        assert_eq!(

900

1

            FilterFunction::parse_str("sepia(80%)").unwrap(),

901

1

            FilterFunction::Sepia(Sepia {

902

1

                proportion: Some(0.80_f32.into())

903

})

904

);

905

906

1

        assert_eq!(

907

1

            FilterFunction::parse_str("sepia(0.52)").unwrap(),

908

1

            FilterFunction::Sepia(Sepia {

909

1

                proportion: Some(0.52_f32.into())

910

})

911

);

912

913

        // values > 1.0 should be clamped to 1.0

914

1

        assert_eq!(

915

1

            FilterFunction::parse_str("sepia(1.5)").unwrap(),

916

            FilterFunction::Sepia(Sepia {

917

                proportion: Some(1.0)

918

})

919

);

920

921

        // negative numbers are invalid.

922

1

        assert_eq!(

923

1

            FilterFunction::parse_str("sepia(-1)").unwrap(),

924

            FilterFunction::Sepia(Sepia { proportion: None }),

925

);

926

2

927

928

    #[test]

929

2

    fn invalid_blur_yields_error() {

930

1

        assert!(FilterFunction::parse_str("blur(foo)").is_err());

931

1

        assert!(FilterFunction::parse_str("blur(42 43)").is_err());

932

2

933

934

    #[test]

935

2

    fn invalid_brightness_yields_error() {

936

1

        assert!(FilterFunction::parse_str("brightness(foo)").is_err());

937

2

938

939

    #[test]

940

2

    fn invalid_contrast_yields_error() {

941

1

        assert!(FilterFunction::parse_str("contrast(foo)").is_err());

942

2

943

944

    #[test]

945

2

    fn invalid_dropshadow_yields_error() {

946

1

        assert!(FilterFunction::parse_str("drop-shadow(blue 5px green)").is_err());

947

1

        assert!(FilterFunction::parse_str("drop-shadow(blue 5px 5px green)").is_err());

948

1

        assert!(FilterFunction::parse_str("drop-shadow(blue 1px)").is_err());

949

1

        assert!(FilterFunction::parse_str("drop-shadow(1 2 3 4 blue)").is_err());

950

2

951

952

    #[test]

953

2

    fn invalid_grayscale_yields_error() {

954

1

        assert!(FilterFunction::parse_str("grayscale(foo)").is_err());

955

2

956

957

    #[test]

958

2

    fn invalid_huerotate_yields_error() {

959

1

        assert!(FilterFunction::parse_str("hue-rotate(foo)").is_err());

960

2

961

962

    #[test]

963

2

    fn invalid_invert_yields_error() {

964

1

        assert!(FilterFunction::parse_str("invert(foo)").is_err());

965

2

966

967

    #[test]

968

2

    fn invalid_opacity_yields_error() {

969

1

        assert!(FilterFunction::parse_str("opacity(foo)").is_err());

970

2

971

972

    #[test]

973

2

    fn invalid_saturate_yields_error() {

974

1

        assert!(FilterFunction::parse_str("saturate(foo)").is_err());

975

2

976

977

    #[test]

978

2

    fn invalid_sepia_yields_error() {

979

1

        assert!(FilterFunction::parse_str("sepia(foo)").is_err());

980

2

981