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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! CSS and SVG filter support.
use app_units::Au;
use azure::AzFloat;
use azure::azure_hl::{ColorMatrixAttribute, ColorMatrixInput, CompositeInput, DrawTarget};
use azure::azure_hl::{FilterNode, FilterType, LinearTransferAttribute, LinearTransferInput};
use azure::azure_hl::{GaussianBlurAttribute, GaussianBlurInput};
use azure::azure_hl::{Matrix5x4, TableTransferAttribute, TableTransferInput};
use style::computed_values::filter;
/// Creates a filter pipeline from a set of CSS filters. Returns the destination end of the filter
/// pipeline and the opacity.
pub fn create_filters(draw_target: &DrawTarget,
temporary_draw_target: &DrawTarget,
style_filters: &filter::T,
accumulated_blur_radius: &mut Au)
-> (FilterNode, AzFloat) {
let mut opacity = 1.0;
let mut filter = draw_target.create_filter(FilterType::Composite);
filter.set_input(CompositeInput, &temporary_draw_target.snapshot());
for style_filter in &style_filters.filters {
match *style_filter {
filter::Filter::HueRotate(angle) => {
let hue_rotate = draw_target.create_filter(FilterType::ColorMatrix);
let matrix = self::hue_rotate(angle.radians() as AzFloat);
hue_rotate.set_attribute(ColorMatrixAttribute::Matrix(matrix));
hue_rotate.set_input(ColorMatrixInput, &filter);
filter = hue_rotate
}
filter::Filter::Opacity(opacity_value) => opacity *= opacity_value as AzFloat,
filter::Filter::Saturate(amount) => {
let saturate = draw_target.create_filter(FilterType::ColorMatrix);
let matrix = self::saturate(amount as AzFloat);
saturate.set_attribute(ColorMatrixAttribute::Matrix(matrix));
saturate.set_input(ColorMatrixInput, &filter);
filter = saturate
}
filter::Filter::Sepia(amount) => {
let sepia = draw_target.create_filter(FilterType::ColorMatrix);
let matrix = self::sepia(amount as AzFloat);
sepia.set_attribute(ColorMatrixAttribute::Matrix(matrix));
sepia.set_input(ColorMatrixInput, &filter);
filter = sepia
}
filter::Filter::Grayscale(amount) => {
let amount = amount as AzFloat;
let grayscale = draw_target.create_filter(FilterType::ColorMatrix);
grayscale.set_attribute(ColorMatrixAttribute::Matrix(self::grayscale(amount)));
grayscale.set_input(ColorMatrixInput, &filter);
filter = grayscale
}
filter::Filter::Invert(amount) => {
let amount = amount as AzFloat;
let invert = draw_target.create_filter(FilterType::TableTransfer);
invert.set_attribute(TableTransferAttribute::DisableR(false));
invert.set_attribute(TableTransferAttribute::DisableG(false));
invert.set_attribute(TableTransferAttribute::DisableB(false));
invert.set_attribute(TableTransferAttribute::TableR(&[1.0, amount - 1.0]));
invert.set_attribute(TableTransferAttribute::TableG(&[1.0, amount - 1.0]));
invert.set_attribute(TableTransferAttribute::TableB(&[1.0, amount - 1.0]));
invert.set_input(TableTransferInput, &filter);
filter = invert
}
filter::Filter::Brightness(amount) => {
let amount = amount as AzFloat;
let brightness = draw_target.create_filter(FilterType::LinearTransfer);
brightness.set_attribute(LinearTransferAttribute::DisableR(false));
brightness.set_attribute(LinearTransferAttribute::DisableG(false));
brightness.set_attribute(LinearTransferAttribute::DisableB(false));
brightness.set_attribute(LinearTransferAttribute::SlopeR(amount));
brightness.set_attribute(LinearTransferAttribute::SlopeG(amount));
brightness.set_attribute(LinearTransferAttribute::SlopeB(amount));
brightness.set_input(LinearTransferInput, &filter);
filter = brightness
}
filter::Filter::Contrast(amount) => {
let amount = amount as AzFloat;
let contrast = draw_target.create_filter(FilterType::LinearTransfer);
contrast.set_attribute(LinearTransferAttribute::DisableR(false));
contrast.set_attribute(LinearTransferAttribute::DisableG(false));
contrast.set_attribute(LinearTransferAttribute::DisableB(false));
contrast.set_attribute(LinearTransferAttribute::SlopeR(amount));
contrast.set_attribute(LinearTransferAttribute::SlopeG(amount));
contrast.set_attribute(LinearTransferAttribute::SlopeB(amount));
contrast.set_attribute(LinearTransferAttribute::InterceptR(-0.5 * amount + 0.5));
contrast.set_attribute(LinearTransferAttribute::InterceptG(-0.5 * amount + 0.5));
contrast.set_attribute(LinearTransferAttribute::InterceptB(-0.5 * amount + 0.5));
contrast.set_input(LinearTransferInput, &filter);
filter = contrast
}
filter::Filter::Blur(amount) => {
*accumulated_blur_radius = accumulated_blur_radius.clone() + amount;
let amount = amount.to_f32_px();
let blur = draw_target.create_filter(FilterType::GaussianBlur);
blur.set_attribute(GaussianBlurAttribute::StdDeviation(amount));
blur.set_input(GaussianBlurInput, &filter);
filter = blur
}
}
}
(filter, opacity)
}
/// Determines if we need a temporary draw target for the given set of filters.
pub fn temporary_draw_target_needed_for_style_filters(filters: &filter::T) -> bool {
for filter in &filters.filters {
match *filter {
filter::Filter::Opacity(value) if value == 1.0 => continue,
_ => return true,
}
}
false
}
// If there is one or more blur filters, we need to know the blur ammount
// to expand the draw target size.
pub fn calculate_accumulated_blur(style_filters: &filter::T) -> Au {
let mut accum_blur = Au::new(0);
for style_filter in &style_filters.filters {
match *style_filter {
filter::Filter::Blur(amount) => {
accum_blur = accum_blur.clone() + amount;
}
_ => continue,
}
}
accum_blur
}
/// Creates a grayscale 5x4 color matrix per CSS-FILTERS § 12.1.1.
fn grayscale(amount: AzFloat) -> Matrix5x4 {
Matrix5x4 {
m11: 0.2126 + 0.7874 * (1.0 - amount),
m21: 0.7152 - 0.7152 * (1.0 - amount),
m31: 0.0722 - 0.0722 * (1.0 - amount),
m41: 0.0,
m51: 0.0,
m12: 0.2126 - 0.2126 * (1.0 - amount),
m22: 0.7152 + 0.2848 * (1.0 - amount),
m32: 0.0722 - 0.0722 * (1.0 - amount),
m42: 0.0,
m52: 0.0,
m13: 0.2126 - 0.2126 * (1.0 - amount),
m23: 0.7152 - 0.7152 * (1.0 - amount),
m33: 0.0722 + 0.9278 * (1.0 - amount),
m43: 0.0,
m53: 0.0,
m14: 0.0, m24: 0.0, m34: 0.0, m44: 1.0, m54: 0.0,
}
}
/// Creates a 5x4 hue rotation color matrix per CSS-FILTERS § 8.5.
fn hue_rotate(angle: AzFloat) -> Matrix5x4 {
let (c, s) = (angle.cos(), angle.sin());
Matrix5x4 {
m11: 0.213 + c * 0.787 + s * -0.213,
m21: 0.715 + c * -0.715 + s * -0.715,
m31: 0.072 + c * -0.072 + s * 0.928,
m41: 0.0,
m51: 0.0,
m12: 0.213 + c * -0.213 + s * 0.143,
m22: 0.715 + c * 0.285 + s * 0.140,
m32: 0.072 + c * -0.072 + s * -0.283,
m42: 0.0,
m52: 0.0,
m13: 0.213 + c * -0.213 + s * -0.787,
m23: 0.715 + c * -0.715 + s * 0.715,
m33: 0.072 + c * 0.928 + s * 0.072,
m43: 0.0,
m53: 0.0,
m14: 0.0, m24: 0.0, m34: 0.0, m44: 1.0, m54: 0.0,
}
}
/// Creates a 5x4 saturation color matrix per CSS-FILTERS § 8.5.
fn saturate(amount: AzFloat) -> Matrix5x4 {
Matrix5x4 {
m11: 0.213 + 0.787 * amount,
m21: 0.715 - 0.715 * amount,
m31: 0.072 - 0.072 * amount,
m41: 0.0,
m51: 0.0,
m12: 0.213 - 0.213 * amount,
m22: 0.715 + 0.285 * amount,
m32: 0.072 - 0.072 * amount,
m42: 0.0,
m52: 0.0,
m13: 0.213 - 0.213 * amount,
m23: 0.715 - 0.715 * amount,
m33: 0.072 + 0.928 * amount,
m43: 0.0,
m53: 0.0,
m14: 0.0, m24: 0.0, m34: 0.0, m44: 1.0, m54: 0.0,
}
}
/// Creates a sepia 5x4 color matrix per CSS-FILTERS § 12.1.1.
fn sepia(amount: AzFloat) -> Matrix5x4 {
Matrix5x4 {
m11: 0.393 + 0.607 * (1.0 - amount),
m21: 0.769 - 0.769 * (1.0 - amount),
m31: 0.189 - 0.189 * (1.0 - amount),
m41: 0.0,
m51: 0.0,
m12: 0.349 - 0.349 * (1.0 - amount),
m22: 0.686 + 0.314 * (1.0 - amount),
m32: 0.168 - 0.168 * (1.0 - amount),
m42: 0.0,
m52: 0.0,
m13: 0.272 - 0.272 * (1.0 - amount),
m23: 0.534 - 0.534 * (1.0 - amount),
m33: 0.131 + 0.869 * (1.0 - amount),
m43: 0.0,
m53: 0.0,
m14: 0.0, m24: 0.0, m34: 0.0, m44: 1.0, m54: 0.0,
}
}
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