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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 https://mozilla.org/MPL/2.0/. */
use std::fmt;
use std::sync::{Arc, Mutex};
use app_units::Au;
use base::id::{BrowsingContextId, PipelineId};
use canvas_traits::canvas::{CanvasId, CanvasMsg, FromLayoutMsg};
use data_url::DataUrl;
use ipc_channel::ipc::{self, IpcSender};
use net_traits::image_cache::{ImageOrMetadataAvailable, UsePlaceholder};
use pixels::Image;
use serde::Serialize;
use servo_arc::Arc as ServoArc;
use style::computed_values::object_fit::T as ObjectFit;
use style::logical_geometry::Direction;
use style::properties::ComputedValues;
use style::servo::url::ComputedUrl;
use style::values::computed::image::Image as ComputedImage;
use style::values::generics::length::GenericLengthPercentageOrAuto;
use style::values::CSSFloat;
use style::Zero;
use url::Url;
use webrender_api::ImageKey;
use crate::context::LayoutContext;
use crate::dom::NodeExt;
use crate::fragment_tree::{BaseFragmentInfo, Fragment, IFrameFragment, ImageFragment};
use crate::geom::{LogicalVec2, PhysicalPoint, PhysicalRect, PhysicalSize};
use crate::sizing::ContentSizes;
use crate::style_ext::{AspectRatio, Clamp, ComputedValuesExt, PaddingBorderMargin};
use crate::{AuOrAuto, ContainingBlock, IndefiniteContainingBlock};
#[derive(Debug, Serialize)]
pub(crate) struct ReplacedContent {
pub kind: ReplacedContentKind,
natural_size: NaturalSizes,
base_fragment_info: BaseFragmentInfo,
}
/// The natural dimensions of a replaced element, including a height, width, and
/// aspect ratio.
///
/// * Raster images always have an natural width and height, with 1 image pixel = 1px.
/// The natural ratio should be based on dividing those.
/// See <https://github.com/w3c/csswg-drafts/issues/4572> for the case where either is zero.
/// PNG specifically disallows this but I (SimonSapin) am not sure about other formats.
///
/// * Form controls have both natural width and height **but no natural ratio**.
/// See <https://github.com/w3c/csswg-drafts/issues/1044> and
/// <https://drafts.csswg.org/css-images/#natural-dimensions> “In general, […]”
///
/// * For SVG, see <https://svgwg.org/svg2-draft/coords.html#SizingSVGInCSS>
/// and again <https://github.com/w3c/csswg-drafts/issues/4572>.
///
/// * IFrames do not have natural width and height or natural ratio according
/// to <https://drafts.csswg.org/css-images/#intrinsic-dimensions>.
#[derive(Debug, Serialize)]
pub(crate) struct NaturalSizes {
pub width: Option<Au>,
pub height: Option<Au>,
pub ratio: Option<CSSFloat>,
}
impl NaturalSizes {
pub(crate) fn from_width_and_height(width: f32, height: f32) -> Self {
// https://drafts.csswg.org/css-images/#natural-aspect-ratio:
// "If an object has a degenerate natural aspect ratio (at least one part being
// zero or infinity), it is treated as having no natural aspect ratio.""
let ratio = if width.is_normal() && height.is_normal() {
Some(width / height)
} else {
None
};
Self {
width: Some(Au::from_f32_px(width)),
height: Some(Au::from_f32_px(height)),
ratio,
}
}
pub(crate) fn empty() -> Self {
Self {
width: None,
height: None,
ratio: None,
}
}
}
#[derive(Serialize)]
pub(crate) enum CanvasSource {
WebGL(ImageKey),
Image(Option<Arc<Mutex<IpcSender<CanvasMsg>>>>),
WebGPU(ImageKey),
}
impl fmt::Debug for CanvasSource {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{}",
match *self {
CanvasSource::WebGL(_) => "WebGL",
CanvasSource::Image(_) => "Image",
CanvasSource::WebGPU(_) => "WebGPU",
}
)
}
}
#[derive(Debug, Serialize)]
pub(crate) struct CanvasInfo {
pub source: CanvasSource,
pub canvas_id: CanvasId,
}
#[derive(Debug, Serialize)]
pub(crate) struct IFrameInfo {
pub pipeline_id: PipelineId,
pub browsing_context_id: BrowsingContextId,
}
#[derive(Debug, Serialize)]
pub(crate) struct VideoInfo {
pub image_key: webrender_api::ImageKey,
}
#[derive(Debug, Serialize)]
pub(crate) enum ReplacedContentKind {
Image(Option<Arc<Image>>),
IFrame(IFrameInfo),
Canvas(CanvasInfo),
Video(VideoInfo),
}
impl ReplacedContent {
pub fn for_element<'dom>(element: impl NodeExt<'dom>, context: &LayoutContext) -> Option<Self> {
if let Some(ref data_attribute_string) = element.as_typeless_object_with_data_attribute() {
if let Some(url) = try_to_parse_image_data_url(data_attribute_string) {
return Self::from_image_url(
element,
context,
&ComputedUrl::Valid(ServoArc::new(url)),
);
}
}
let (kind, natural_size_in_dots) = {
if let Some((image, natural_size_in_dots)) = element.as_image() {
(
ReplacedContentKind::Image(image),
Some(natural_size_in_dots),
)
} else if let Some((canvas_info, natural_size_in_dots)) = element.as_canvas() {
(
ReplacedContentKind::Canvas(canvas_info),
Some(natural_size_in_dots),
)
} else if let Some((pipeline_id, browsing_context_id)) = element.as_iframe() {
(
ReplacedContentKind::IFrame(IFrameInfo {
pipeline_id,
browsing_context_id,
}),
None,
)
} else if let Some((image_key, natural_size_in_dots)) = element.as_video() {
(
ReplacedContentKind::Video(VideoInfo { image_key }),
Some(natural_size_in_dots),
)
} else {
return None;
}
};
let natural_size =
natural_size_in_dots.map_or_else(NaturalSizes::empty, |naturalc_size_in_dots| {
// FIXME: should 'image-resolution' (when implemented) be used *instead* of
// `script::dom::htmlimageelement::ImageRequest::current_pixel_density`?
// https://drafts.csswg.org/css-images-4/#the-image-resolution
let dppx = 1.0;
let width = (naturalc_size_in_dots.width as CSSFloat) / dppx;
let height = (naturalc_size_in_dots.height as CSSFloat) / dppx;
NaturalSizes::from_width_and_height(width, height)
});
let base_fragment_info = BaseFragmentInfo::new_for_node(element.opaque());
Some(Self {
kind,
natural_size,
base_fragment_info,
})
}
pub fn from_image_url<'dom>(
element: impl NodeExt<'dom>,
context: &LayoutContext,
image_url: &ComputedUrl,
) -> Option<Self> {
if let ComputedUrl::Valid(image_url) = image_url {
let (image, width, height) = match context.get_or_request_image_or_meta(
element.opaque(),
image_url.clone().into(),
UsePlaceholder::No,
) {
Some(ImageOrMetadataAvailable::ImageAvailable { image, .. }) => {
(Some(image.clone()), image.width as f32, image.height as f32)
},
Some(ImageOrMetadataAvailable::MetadataAvailable(metadata)) => {
(None, metadata.width as f32, metadata.height as f32)
},
None => return None,
};
return Some(Self {
kind: ReplacedContentKind::Image(image),
natural_size: NaturalSizes::from_width_and_height(width, height),
base_fragment_info: BaseFragmentInfo::new_for_node(element.opaque()),
});
}
None
}
pub fn from_image<'dom>(
element: impl NodeExt<'dom>,
context: &LayoutContext,
image: &ComputedImage,
) -> Option<Self> {
match image {
ComputedImage::Url(image_url) => Self::from_image_url(element, context, image_url),
_ => None, // TODO
}
}
fn flow_relative_intrinsic_size(&self, style: &ComputedValues) -> LogicalVec2<Option<Au>> {
let intrinsic_size = PhysicalSize::new(self.natural_size.width, self.natural_size.height);
LogicalVec2::from_physical_size(&intrinsic_size, style.writing_mode)
}
fn inline_size_over_block_size_intrinsic_ratio(
&self,
style: &ComputedValues,
) -> Option<CSSFloat> {
self.natural_size.ratio.map(|width_over_height| {
if style.writing_mode.is_vertical() {
1. / width_over_height
} else {
width_over_height
}
})
}
pub fn inline_content_sizes(
&self,
_: &LayoutContext,
containing_block_for_children: &IndefiniteContainingBlock,
preferred_aspect_ratio: Option<AspectRatio>,
) -> ContentSizes {
// FIXME: min/max-content of replaced elements is not defined in
// https://dbaron.org/css/intrinsic/
// This seems sensible?
let block_size = containing_block_for_children.size.block;
let inline_size = match (block_size, preferred_aspect_ratio) {
(AuOrAuto::LengthPercentage(block_size), Some(ratio)) => {
ratio.compute_dependent_size(Direction::Inline, block_size)
},
_ => self
.flow_relative_intrinsic_size(containing_block_for_children.style)
.inline
.unwrap_or_else(Au::zero),
};
inline_size.into()
}
pub fn make_fragments(
&self,
style: &ServoArc<ComputedValues>,
containing_block: &ContainingBlock,
size: PhysicalSize<Au>,
) -> Vec<Fragment> {
let aspect_ratio = self.preferred_aspect_ratio(&containing_block.into(), style);
let natural_size = PhysicalSize::new(
self.natural_size.width.unwrap_or(size.width),
self.natural_size.height.unwrap_or(size.height),
);
let object_fit_size = aspect_ratio.map_or(size, |aspect_ratio| {
let preserve_aspect_ratio_with_comparison =
|size: PhysicalSize<Au>, comparison: fn(&Au, &Au) -> bool| {
let (width_axis, height_axis) = if style.writing_mode.is_horizontal() {
(Direction::Inline, Direction::Block)
} else {
(Direction::Block, Direction::Inline)
};
let candidate_width =
aspect_ratio.compute_dependent_size(width_axis, size.height);
if comparison(&candidate_width, &size.width) {
return PhysicalSize::new(candidate_width, size.height);
}
let candidate_height =
aspect_ratio.compute_dependent_size(height_axis, size.width);
debug_assert!(comparison(&candidate_height, &size.height));
PhysicalSize::new(size.width, candidate_height)
};
match style.clone_object_fit() {
ObjectFit::Fill => size,
ObjectFit::Contain => preserve_aspect_ratio_with_comparison(size, PartialOrd::le),
ObjectFit::Cover => preserve_aspect_ratio_with_comparison(size, PartialOrd::ge),
ObjectFit::None => natural_size,
ObjectFit::ScaleDown => {
preserve_aspect_ratio_with_comparison(size.min(natural_size), PartialOrd::le)
},
}
});
let object_position = style.clone_object_position();
let horizontal_position = object_position
.horizontal
.to_used_value(size.width - object_fit_size.width);
let vertical_position = object_position
.vertical
.to_used_value(size.height - object_fit_size.height);
let rect = PhysicalRect::new(
PhysicalPoint::new(horizontal_position, vertical_position),
object_fit_size,
);
let clip = PhysicalRect::new(PhysicalPoint::origin(), size);
match &self.kind {
ReplacedContentKind::Image(image) => image
.as_ref()
.and_then(|image| image.id)
.map(|image_key| {
Fragment::Image(ImageFragment {
base: self.base_fragment_info.into(),
style: style.clone(),
rect,
clip,
image_key,
})
})
.into_iter()
.collect(),
ReplacedContentKind::Video(video) => vec![Fragment::Image(ImageFragment {
base: self.base_fragment_info.into(),
style: style.clone(),
rect,
clip,
image_key: video.image_key,
})],
ReplacedContentKind::IFrame(iframe) => {
vec![Fragment::IFrame(IFrameFragment {
base: self.base_fragment_info.into(),
style: style.clone(),
pipeline_id: iframe.pipeline_id,
browsing_context_id: iframe.browsing_context_id,
rect,
})]
},
ReplacedContentKind::Canvas(canvas_info) => {
if self.natural_size.width == Some(Au::zero()) ||
self.natural_size.height == Some(Au::zero())
{
return vec![];
}
let image_key = match canvas_info.source {
CanvasSource::WebGL(image_key) => image_key,
CanvasSource::WebGPU(image_key) => image_key,
CanvasSource::Image(ref ipc_renderer) => match *ipc_renderer {
Some(ref ipc_renderer) => {
let ipc_renderer = ipc_renderer.lock().unwrap();
let (sender, receiver) = ipc::channel().unwrap();
ipc_renderer
.send(CanvasMsg::FromLayout(
FromLayoutMsg::SendData(sender),
canvas_info.canvas_id,
))
.unwrap();
receiver.recv().unwrap().image_key
},
None => return vec![],
},
};
vec![Fragment::Image(ImageFragment {
base: self.base_fragment_info.into(),
style: style.clone(),
rect,
clip,
image_key,
})]
},
}
}
pub(crate) fn preferred_aspect_ratio(
&self,
containing_block: &IndefiniteContainingBlock,
style: &ComputedValues,
) -> Option<AspectRatio> {
style.preferred_aspect_ratio(
self.inline_size_over_block_size_intrinsic_ratio(style),
containing_block.try_into().ok().as_ref(),
containing_block.style.writing_mode,
)
}
/// <https://drafts.csswg.org/css2/visudet.html#inline-replaced-width>
/// <https://drafts.csswg.org/css2/visudet.html#inline-replaced-height>
///
/// Also used in other cases, for example
/// <https://drafts.csswg.org/css2/visudet.html#block-replaced-width>
pub(crate) fn used_size_as_if_inline_element(
&self,
containing_block: &ContainingBlock,
style: &ComputedValues,
pbm: &PaddingBorderMargin,
) -> LogicalVec2<Au> {
let box_size = style
.content_box_size(containing_block, pbm)
// We need to clamp to zero here to obtain the proper aspect
// ratio when box-sizing is border-box and the inner box size
// would otherwise be negative.
.map(|value| value.map(|value| value.max(Au::zero())));
let min_box_size = style
.content_min_box_size(containing_block, pbm)
.auto_is(Au::zero);
let max_box_size = style.content_max_box_size(containing_block, pbm);
self.used_size_as_if_inline_element_from_content_box_sizes(
containing_block,
style,
box_size,
min_box_size,
max_box_size,
)
}
/// <https://drafts.csswg.org/css2/visudet.html#inline-replaced-width>
/// <https://drafts.csswg.org/css2/visudet.html#inline-replaced-height>
///
/// Also used in other cases, for example
/// <https://drafts.csswg.org/css2/visudet.html#block-replaced-width>
pub(crate) fn used_size_as_if_inline_element_from_content_box_sizes(
&self,
containing_block: &ContainingBlock,
style: &ComputedValues,
box_size: LogicalVec2<AuOrAuto>,
min_box_size: LogicalVec2<Au>,
max_box_size: LogicalVec2<Option<Au>>,
) -> LogicalVec2<Au> {
let mode = style.writing_mode;
let intrinsic_size = self.flow_relative_intrinsic_size(style);
let intrinsic_ratio = self.preferred_aspect_ratio(&containing_block.into(), style);
let default_object_size = || {
// FIXME:
// https://drafts.csswg.org/css-images/#default-object-size
// “If 300px is too wide to fit the device, UAs should use the width of
// the largest rectangle that has a 2:1 ratio and fits the device instead.”
// “height of the largest rectangle that has a 2:1 ratio, has a height not greater
// than 150px, and has a width not greater than the device width.”
LogicalVec2::from_physical_size(
&PhysicalSize::new(Au::from_px(300), Au::from_px(150)),
mode,
)
};
let get_tentative_size = |LogicalVec2 { inline, block }| -> LogicalVec2<Au> {
match (inline, block) {
(AuOrAuto::LengthPercentage(inline), AuOrAuto::LengthPercentage(block)) => {
LogicalVec2 { inline, block }
},
(AuOrAuto::LengthPercentage(inline), AuOrAuto::Auto) => {
let block = if let Some(ratio) = intrinsic_ratio {
ratio.compute_dependent_size(Direction::Block, inline)
} else if let Some(block) = intrinsic_size.block {
block
} else {
default_object_size().block
};
LogicalVec2 { inline, block }
},
(AuOrAuto::Auto, AuOrAuto::LengthPercentage(block)) => {
let inline = if let Some(ratio) = intrinsic_ratio {
ratio.compute_dependent_size(Direction::Inline, block)
} else if let Some(inline) = intrinsic_size.inline {
inline
} else {
default_object_size().inline
};
LogicalVec2 { inline, block }
},
(AuOrAuto::Auto, AuOrAuto::Auto) => {
let inline_size =
match (intrinsic_size.inline, intrinsic_size.block, intrinsic_ratio) {
(Some(inline), _, _) => inline,
(None, Some(block), Some(ratio)) => {
// “used height” in CSS 2 is always gonna be the intrinsic one,
// since it is available.
ratio.compute_dependent_size(Direction::Inline, block)
},
// FIXME
//
// “If 'height' and 'width' both have computed values of 'auto'
// and the element has an intrinsic ratio but no intrinsic height or width,
// […]”
//
// In this `match` expression this would be an additional arm here:
//
// ```
// (Vec2 { inline: None, block: None }, Some(_)) => {…}
// ```
//
// “[…] then the used value of 'width' is undefined in CSS 2.
// However, it is suggested that, if the containing block's width
// does not itself depend on the replaced element's width,
// then the used value of 'width' is calculated from the constraint
// equation used for block-level, non-replaced elements in normal flow.”
_ => default_object_size().inline,
};
let block_size = if let Some(block) = intrinsic_size.block {
block
} else if let Some(ratio) = intrinsic_ratio {
// “used width” in CSS 2 is what we just computed above
ratio.compute_dependent_size(Direction::Block, inline_size)
} else {
default_object_size().block
};
LogicalVec2 {
inline: inline_size,
block: block_size,
}
},
}
};
// https://drafts.csswg.org/css2/visudet.html#min-max-widths
// “However, for replaced elements with an intrinsic ratio and both
// 'width' and 'height' specified as 'auto', the algorithm is as follows”
if let (AuOrAuto::Auto, AuOrAuto::Auto, Some(ratio)) =
(box_size.inline, box_size.block, intrinsic_ratio)
{
let LogicalVec2 {
inline: inline_size,
block: block_size,
} = get_tentative_size(box_size);
enum Violation {
None,
Below(Au),
Above(Au),
}
let violation = |size: Au, min_size: Au, mut max_size: Option<Au>| {
if let Some(max) = max_size.as_mut() {
max.max_assign(min_size);
}
if size < min_size {
return Violation::Below(min_size);
}
match max_size {
Some(max_size) if size > max_size => Violation::Above(max_size),
_ => Violation::None,
}
};
return match (
violation(inline_size, min_box_size.inline, max_box_size.inline),
violation(block_size, min_box_size.block, max_box_size.block),
) {
// Row 1.
(Violation::None, Violation::None) => LogicalVec2 {
inline: inline_size,
block: block_size,
},
// Row 2.
(Violation::Above(max_inline_size), Violation::None) => LogicalVec2 {
inline: max_inline_size,
block: ratio
.compute_dependent_size(Direction::Block, max_inline_size)
.max(min_box_size.block),
},
// Row 3.
(Violation::Below(min_inline_size), Violation::None) => LogicalVec2 {
inline: min_inline_size,
block: ratio
.compute_dependent_size(Direction::Block, min_inline_size)
.clamp_below_max(max_box_size.block),
},
// Row 4.
(Violation::None, Violation::Above(max_block_size)) => LogicalVec2 {
inline: ratio
.compute_dependent_size(Direction::Inline, max_block_size)
.max(min_box_size.inline),
block: max_block_size,
},
// Row 5.
(Violation::None, Violation::Below(min_block_size)) => LogicalVec2 {
inline: ratio
.compute_dependent_size(Direction::Inline, min_block_size)
.clamp_below_max(max_box_size.inline),
block: min_block_size,
},
// Rows 6-7.
(Violation::Above(max_inline_size), Violation::Above(max_block_size)) => {
if max_inline_size.0 * block_size.0 <= max_block_size.0 * inline_size.0 {
// Row 6.
LogicalVec2 {
inline: max_inline_size,
block: ratio
.compute_dependent_size(Direction::Block, max_inline_size)
.max(min_box_size.block),
}
} else {
// Row 7.
LogicalVec2 {
inline: ratio
.compute_dependent_size(Direction::Inline, max_block_size)
.max(min_box_size.inline),
block: max_block_size,
}
}
},
// Rows 8-9.
(Violation::Below(min_inline_size), Violation::Below(min_block_size)) => {
if min_inline_size.0 * block_size.0 <= min_block_size.0 * inline_size.0 {
// Row 8.
LogicalVec2 {
inline: ratio
.compute_dependent_size(Direction::Inline, min_block_size)
.clamp_below_max(max_box_size.inline),
block: min_block_size,
}
} else {
// Row 9.
LogicalVec2 {
inline: min_inline_size,
block: ratio
.compute_dependent_size(Direction::Block, min_inline_size)
.clamp_below_max(max_box_size.block),
}
}
},
// Row 10.
(Violation::Below(min_inline_size), Violation::Above(max_block_size)) => {
LogicalVec2 {
inline: min_inline_size,
block: max_block_size,
}
},
// Row 11.
(Violation::Above(max_inline_size), Violation::Below(min_block_size)) => {
LogicalVec2 {
inline: max_inline_size,
block: min_block_size,
}
},
};
}
// https://drafts.csswg.org/css2/#min-max-widths "The following algorithm describes how the two properties
// influence the used value of the width property:
//
// 1. The tentative used width is calculated (without min-width and max-width) following the rules under
// "Calculating widths and margins" above.
// 2. If the tentative used width is greater than max-width, the rules above are applied again, but this time
// using the computed value of max-width as the computed value for width.
// 3. If the resulting width is smaller than min-width, the rules above are applied again, but this time using
// the value of min-width as the computed value for width."
let mut tentative_size = get_tentative_size(box_size);
// Create an inline/block size vector from the given clamped inline and block sizes if they are provided,
// falling back to the regular box size if they are not
let size_from_maybe_clamped =
|(clamped_inline, clamped_block): (Option<Au>, Option<Au>)| {
let clamped_inline = clamped_inline
.map(GenericLengthPercentageOrAuto::LengthPercentage)
.unwrap_or(box_size.inline);
let clamped_block = clamped_block
.map(GenericLengthPercentageOrAuto::LengthPercentage)
.unwrap_or(box_size.block);
LogicalVec2 {
inline: clamped_inline,
block: clamped_block,
}
};
let clamped_max = (
max_box_size
.inline
.filter(|max_inline_size| tentative_size.inline > *max_inline_size),
max_box_size
.block
.filter(|max_block_size| tentative_size.block > *max_block_size),
);
if clamped_max.0.is_some() || clamped_max.1.is_some() {
tentative_size = get_tentative_size(size_from_maybe_clamped(clamped_max));
}
let clamped_min = (
Some(min_box_size.inline)
.filter(|min_inline_size| tentative_size.inline < *min_inline_size),
Some(min_box_size.block)
.filter(|min_block_size| tentative_size.block < *min_block_size),
);
if clamped_min.0.is_some() || clamped_min.1.is_some() {
tentative_size = get_tentative_size(size_from_maybe_clamped(clamped_min));
}
tentative_size
}
}
fn try_to_parse_image_data_url(string: &str) -> Option<Url> {
if !string.starts_with("data:") {
return None;
}
let data_url = DataUrl::process(string).ok()?;
let mime_type = data_url.mime_type();
if mime_type.type_ != "image" {
return None;
}
// TODO: Find a better way to test for supported image formats. Currently this type of check is
// repeated several places in Servo, but should be centralized somehow.
if !matches!(
mime_type.subtype.as_str(),
"png" | "jpeg" | "gif" | "webp" | "bmp" | "ico"
) {
return None;
}
Url::parse(string).ok()
}