mirror of
https://github.com/servo/servo.git
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d941d2fd67
This converts all geometry in the FragmentTree into physical geometry, doing conversions ahead of time instead of when traversing the fragment tree. This is necessary to properly implement BiDi in Servo as we need to know what side borders are on in mixed RTL and LTR contexts. In addition, fragments are laid out in a particular context and only that context knows its writing mode. There were issues where were using one writing mode to lay out and another to convert to phyisical coordinates. This isn't an issue now since we only use the default writing mode, but starts to be an issue with BiDi text. Closes #25564. Signed-off-by: Martin Robinson <mrobinson@igalia.com>
651 lines
26 KiB
Rust
651 lines
26 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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use std::fmt;
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use std::sync::{Arc, Mutex};
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use app_units::Au;
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use base::id::{BrowsingContextId, PipelineId};
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use canvas_traits::canvas::{CanvasId, CanvasMsg, FromLayoutMsg};
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use data_url::DataUrl;
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use ipc_channel::ipc::{self, IpcSender};
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use net_traits::image_cache::{ImageOrMetadataAvailable, UsePlaceholder};
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use pixels::Image;
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use serde::Serialize;
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use servo_arc::Arc as ServoArc;
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use style::logical_geometry::Direction;
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use style::properties::ComputedValues;
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use style::servo::url::ComputedUrl;
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use style::values::computed::image::Image as ComputedImage;
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use style::values::generics::length::GenericLengthPercentageOrAuto;
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use style::values::CSSFloat;
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use style::Zero;
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use url::Url;
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use webrender_api::ImageKey;
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use crate::context::LayoutContext;
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use crate::dom::NodeExt;
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use crate::fragment_tree::{BaseFragmentInfo, Fragment, IFrameFragment, ImageFragment};
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use crate::geom::{LogicalVec2, PhysicalPoint, PhysicalRect, PhysicalSize};
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use crate::sizing::ContentSizes;
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use crate::style_ext::{Clamp, ComputedValuesExt, PaddingBorderMargin};
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use crate::{AuOrAuto, ContainingBlock};
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#[derive(Debug, Serialize)]
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pub(crate) struct ReplacedContent {
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pub kind: ReplacedContentKind,
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intrinsic: IntrinsicSizes,
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base_fragment_info: BaseFragmentInfo,
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}
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/// * Raster images always have an intrinsic width and height, with 1 image pixel = 1px.
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/// The intrinsic ratio should be based on dividing those.
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/// See <https://github.com/w3c/csswg-drafts/issues/4572> for the case where either is zero.
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/// PNG specifically disallows this but I (SimonSapin) am not sure about other formats.
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///
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/// * Form controls have both intrinsic width and height **but no intrinsic ratio**.
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/// See <https://github.com/w3c/csswg-drafts/issues/1044> and
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/// <https://drafts.csswg.org/css-images/#intrinsic-dimensions> “In general, […]”
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///
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/// * For SVG, see <https://svgwg.org/svg2-draft/coords.html#SizingSVGInCSS>
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/// and again <https://github.com/w3c/csswg-drafts/issues/4572>.
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///
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/// * IFrames do not have intrinsic width and height or intrinsic ratio according
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/// to <https://drafts.csswg.org/css-images/#intrinsic-dimensions>.
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#[derive(Debug, Serialize)]
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pub(crate) struct IntrinsicSizes {
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pub width: Option<Au>,
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pub height: Option<Au>,
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pub ratio: Option<CSSFloat>,
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}
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impl IntrinsicSizes {
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pub(crate) fn from_width_and_height(width: f32, height: f32) -> Self {
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// https://drafts.csswg.org/css-images/#natural-aspect-ratio:
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// "If an object has a degenerate natural aspect ratio (at least one part being
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// zero or infinity), it is treated as having no natural aspect ratio.""
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let ratio = if width.is_normal() && height.is_normal() {
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Some(width / height)
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} else {
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None
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};
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Self {
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width: Some(Au::from_f32_px(width)),
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height: Some(Au::from_f32_px(height)),
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ratio,
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}
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}
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pub(crate) fn empty() -> Self {
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Self {
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width: None,
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height: None,
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ratio: None,
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}
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}
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}
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#[derive(Serialize)]
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pub(crate) enum CanvasSource {
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WebGL(ImageKey),
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Image(Option<Arc<Mutex<IpcSender<CanvasMsg>>>>),
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WebGPU(ImageKey),
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}
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impl fmt::Debug for CanvasSource {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(
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f,
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"{}",
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match *self {
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CanvasSource::WebGL(_) => "WebGL",
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CanvasSource::Image(_) => "Image",
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CanvasSource::WebGPU(_) => "WebGPU",
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}
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)
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}
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}
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#[derive(Debug, Serialize)]
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pub(crate) struct CanvasInfo {
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pub source: CanvasSource,
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pub canvas_id: CanvasId,
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}
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#[derive(Debug, Serialize)]
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pub(crate) struct IFrameInfo {
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pub pipeline_id: PipelineId,
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pub browsing_context_id: BrowsingContextId,
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}
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#[derive(Debug, Serialize)]
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pub(crate) struct VideoInfo {
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pub image_key: webrender_api::ImageKey,
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}
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#[derive(Debug, Serialize)]
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pub(crate) enum ReplacedContentKind {
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Image(Option<Arc<Image>>),
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IFrame(IFrameInfo),
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Canvas(CanvasInfo),
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Video(VideoInfo),
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}
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impl ReplacedContent {
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pub fn for_element<'dom>(element: impl NodeExt<'dom>, context: &LayoutContext) -> Option<Self> {
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if let Some(ref data_attribute_string) = element.as_typeless_object_with_data_attribute() {
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if let Some(url) = try_to_parse_image_data_url(data_attribute_string) {
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return Self::from_image_url(
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element,
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context,
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&ComputedUrl::Valid(ServoArc::new(url)),
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);
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}
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}
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let (kind, intrinsic_size_in_dots) = {
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if let Some((image, intrinsic_size_in_dots)) = element.as_image() {
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(
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ReplacedContentKind::Image(image),
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Some(intrinsic_size_in_dots),
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)
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} else if let Some((canvas_info, intrinsic_size_in_dots)) = element.as_canvas() {
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(
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ReplacedContentKind::Canvas(canvas_info),
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Some(intrinsic_size_in_dots),
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)
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} else if let Some((pipeline_id, browsing_context_id)) = element.as_iframe() {
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(
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ReplacedContentKind::IFrame(IFrameInfo {
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pipeline_id,
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browsing_context_id,
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}),
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None,
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)
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} else if let Some((image_key, intrinsic_size_in_dots)) = element.as_video() {
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(
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ReplacedContentKind::Video(VideoInfo { image_key }),
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Some(intrinsic_size_in_dots),
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)
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} else {
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return None;
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}
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};
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let intrinsic =
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intrinsic_size_in_dots.map_or_else(IntrinsicSizes::empty, |intrinsic_size_in_dots| {
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// FIXME: should 'image-resolution' (when implemented) be used *instead* of
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// `script::dom::htmlimageelement::ImageRequest::current_pixel_density`?
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// https://drafts.csswg.org/css-images-4/#the-image-resolution
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let dppx = 1.0;
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let width = (intrinsic_size_in_dots.width as CSSFloat) / dppx;
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let height = (intrinsic_size_in_dots.height as CSSFloat) / dppx;
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IntrinsicSizes::from_width_and_height(width, height)
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});
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let base_fragment_info = BaseFragmentInfo::new_for_node(element.opaque());
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Some(Self {
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kind,
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intrinsic,
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base_fragment_info,
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})
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}
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pub fn from_image_url<'dom>(
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element: impl NodeExt<'dom>,
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context: &LayoutContext,
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image_url: &ComputedUrl,
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) -> Option<Self> {
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if let ComputedUrl::Valid(image_url) = image_url {
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let (image, width, height) = match context.get_or_request_image_or_meta(
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element.opaque(),
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image_url.clone().into(),
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UsePlaceholder::No,
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) {
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Some(ImageOrMetadataAvailable::ImageAvailable { image, .. }) => {
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(Some(image.clone()), image.width as f32, image.height as f32)
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},
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Some(ImageOrMetadataAvailable::MetadataAvailable(metadata)) => {
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(None, metadata.width as f32, metadata.height as f32)
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},
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None => return None,
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};
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return Some(Self {
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kind: ReplacedContentKind::Image(image),
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intrinsic: IntrinsicSizes::from_width_and_height(width, height),
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base_fragment_info: BaseFragmentInfo::new_for_node(element.opaque()),
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});
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}
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None
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}
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pub fn from_image<'dom>(
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element: impl NodeExt<'dom>,
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context: &LayoutContext,
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image: &ComputedImage,
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) -> Option<Self> {
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match image {
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ComputedImage::Url(image_url) => Self::from_image_url(element, context, image_url),
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_ => None, // TODO
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}
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}
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fn flow_relative_intrinsic_size(&self, style: &ComputedValues) -> LogicalVec2<Option<Au>> {
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let intrinsic_size = PhysicalSize::new(self.intrinsic.width, self.intrinsic.height);
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LogicalVec2::from_physical_size(&intrinsic_size, style.writing_mode)
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}
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pub fn inline_size_over_block_size_intrinsic_ratio(
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&self,
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style: &ComputedValues,
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) -> Option<CSSFloat> {
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self.intrinsic.ratio.map(|width_over_height| {
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if style.writing_mode.is_vertical() {
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1. / width_over_height
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} else {
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width_over_height
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}
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})
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}
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pub fn inline_content_sizes(&self, style: &ComputedValues) -> ContentSizes {
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// FIXME: min/max-content of replaced elements is not defined in
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// https://dbaron.org/css/intrinsic/
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// This seems sensible?
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let inline = self
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.flow_relative_intrinsic_size(style)
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.inline
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.unwrap_or(Au::zero());
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ContentSizes {
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min_content: inline,
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max_content: inline,
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}
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}
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pub fn make_fragments(
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&self,
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style: &ServoArc<ComputedValues>,
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size: PhysicalSize<Au>,
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) -> Vec<Fragment> {
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let rect = PhysicalRect::new(PhysicalPoint::origin(), size);
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match &self.kind {
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ReplacedContentKind::Image(image) => image
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.as_ref()
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.and_then(|image| image.id)
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.map(|image_key| {
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Fragment::Image(ImageFragment {
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base: self.base_fragment_info.into(),
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style: style.clone(),
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rect,
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image_key,
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})
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})
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.into_iter()
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.collect(),
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ReplacedContentKind::Video(video) => vec![Fragment::Image(ImageFragment {
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base: self.base_fragment_info.into(),
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style: style.clone(),
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rect,
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image_key: video.image_key,
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})],
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ReplacedContentKind::IFrame(iframe) => {
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vec![Fragment::IFrame(IFrameFragment {
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base: self.base_fragment_info.into(),
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style: style.clone(),
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pipeline_id: iframe.pipeline_id,
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browsing_context_id: iframe.browsing_context_id,
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rect,
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})]
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},
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ReplacedContentKind::Canvas(canvas_info) => {
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if self.intrinsic.width == Some(Au::zero()) ||
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self.intrinsic.height == Some(Au::zero())
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{
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return vec![];
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}
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let image_key = match canvas_info.source {
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CanvasSource::WebGL(image_key) => image_key,
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CanvasSource::WebGPU(image_key) => image_key,
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CanvasSource::Image(ref ipc_renderer) => match *ipc_renderer {
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Some(ref ipc_renderer) => {
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let ipc_renderer = ipc_renderer.lock().unwrap();
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let (sender, receiver) = ipc::channel().unwrap();
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ipc_renderer
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.send(CanvasMsg::FromLayout(
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FromLayoutMsg::SendData(sender),
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canvas_info.canvas_id,
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))
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.unwrap();
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receiver.recv().unwrap().image_key
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},
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None => return vec![],
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},
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};
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vec![Fragment::Image(ImageFragment {
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base: self.base_fragment_info.into(),
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style: style.clone(),
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rect,
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image_key,
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})]
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},
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}
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}
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/// <https://drafts.csswg.org/css2/visudet.html#inline-replaced-width>
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/// <https://drafts.csswg.org/css2/visudet.html#inline-replaced-height>
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///
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/// Also used in other cases, for example
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/// <https://drafts.csswg.org/css2/visudet.html#block-replaced-width>
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pub fn used_size_as_if_inline_element(
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&self,
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containing_block: &ContainingBlock,
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style: &ComputedValues,
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box_size: Option<LogicalVec2<AuOrAuto>>,
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pbm: &PaddingBorderMargin,
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) -> LogicalVec2<Au> {
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let mode = style.writing_mode;
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let intrinsic_size = self.flow_relative_intrinsic_size(style);
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let intrinsic_ratio = style.preferred_aspect_ratio(
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self.inline_size_over_block_size_intrinsic_ratio(style),
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containing_block,
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);
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let box_size = box_size.unwrap_or(
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style
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.content_box_size(containing_block, pbm)
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// We need to clamp to zero here to obtain the proper aspect
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// ratio when box-sizing is border-box and the inner box size
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// would otherwise be negative.
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.map(|v| v.map(|v| Au::from(v).max(Au::zero()))),
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);
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let max_box_size = style
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.content_max_box_size(containing_block, pbm)
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.map(|v| v.map(Au::from));
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let min_box_size = style
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.content_min_box_size(containing_block, pbm)
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.map(|v| v.map(Au::from))
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.auto_is(Au::zero);
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let default_object_size = || {
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// FIXME:
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// https://drafts.csswg.org/css-images/#default-object-size
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// “If 300px is too wide to fit the device, UAs should use the width of
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// the largest rectangle that has a 2:1 ratio and fits the device instead.”
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// “height of the largest rectangle that has a 2:1 ratio, has a height not greater
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// than 150px, and has a width not greater than the device width.”
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LogicalVec2::from_physical_size(
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&PhysicalSize::new(Au::from_px(300), Au::from_px(150)),
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mode,
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)
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};
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let get_tentative_size = |LogicalVec2 { inline, block }| -> LogicalVec2<Au> {
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match (inline, block) {
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(AuOrAuto::LengthPercentage(inline), AuOrAuto::LengthPercentage(block)) => {
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LogicalVec2 { inline, block }
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},
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(AuOrAuto::LengthPercentage(inline), AuOrAuto::Auto) => {
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let block = if let Some(ratio) = intrinsic_ratio {
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ratio.compute_dependent_size(Direction::Block, inline)
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} else if let Some(block) = intrinsic_size.block {
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block
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} else {
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default_object_size().block
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};
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LogicalVec2 { inline, block }
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},
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(AuOrAuto::Auto, AuOrAuto::LengthPercentage(block)) => {
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let inline = if let Some(ratio) = intrinsic_ratio {
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ratio.compute_dependent_size(Direction::Inline, block)
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} else if let Some(inline) = intrinsic_size.inline {
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inline
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} else {
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default_object_size().inline
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};
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LogicalVec2 { inline, block }
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},
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(AuOrAuto::Auto, AuOrAuto::Auto) => {
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let inline_size =
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match (intrinsic_size.inline, intrinsic_size.block, intrinsic_ratio) {
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(Some(inline), _, _) => inline,
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(None, Some(block), Some(ratio)) => {
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// “used height” in CSS 2 is always gonna be the intrinsic one,
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// since it is available.
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ratio.compute_dependent_size(Direction::Inline, block)
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},
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// FIXME
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//
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// “If 'height' and 'width' both have computed values of 'auto'
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// and the element has an intrinsic ratio but no intrinsic height or width,
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// […]”
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//
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// In this `match` expression this would be an additional arm here:
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//
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// ```
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// (Vec2 { inline: None, block: None }, Some(_)) => {…}
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// ```
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//
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// “[…] then the used value of 'width' is undefined in CSS 2.
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// However, it is suggested that, if the containing block's width
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// does not itself depend on the replaced element's width,
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// then the used value of 'width' is calculated from the constraint
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// equation used for block-level, non-replaced elements in normal flow.”
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_ => default_object_size().inline,
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};
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let block_size = if let Some(block) = intrinsic_size.block {
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block
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} else if let Some(ratio) = intrinsic_ratio {
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// “used width” in CSS 2 is what we just computed above
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ratio.compute_dependent_size(Direction::Block, inline_size)
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} else {
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default_object_size().block
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};
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LogicalVec2 {
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inline: inline_size,
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block: block_size,
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}
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},
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}
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};
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|
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// https://drafts.csswg.org/css2/visudet.html#min-max-widths
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// “However, for replaced elements with an intrinsic ratio and both
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// 'width' and 'height' specified as 'auto', the algorithm is as follows”
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if let (AuOrAuto::Auto, AuOrAuto::Auto, Some(ratio)) =
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(box_size.inline, box_size.block, intrinsic_ratio)
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{
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let LogicalVec2 {
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inline: inline_size,
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block: block_size,
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} = get_tentative_size(box_size);
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enum Violation {
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None,
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Below(Au),
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Above(Au),
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}
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let violation = |size: Au, min_size: Au, mut max_size: Option<Au>| {
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if let Some(max) = max_size.as_mut() {
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max.max_assign(min_size);
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}
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if size < min_size {
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return Violation::Below(min_size);
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}
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match max_size {
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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()
|
|
}
|