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LibWeb: Support loading FontFaces constructed with binary data

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This commit is contained in:
Andrew Kaster 2024-05-13 12:02:38 -06:00 • committed by Andrew Kaster
commit 60b3436ea3
Notes: sideshowbarker 2024-07-18 05:01:22 +09:00
8 changed files with 245 additions and 13 deletions
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6
Tests/LibWeb/Text/expected/css/FontFace-binary-data.txt Normal file
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@ -0,0 +1,6 @@
badFace.status: error
badFace.family: My Cool Font
zeroBytesFace.status: error
zeroBytesFace.family: Empty Font
face.status: loaded
face.family: Hash Sans

42
Tests/LibWeb/Text/input/css/FontFace-binary-data.html Normal file
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@ -0,0 +1,42 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<script>
asyncTest(async (done) => {
const badFace = new FontFace("My Cool Font", new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7]));
await badFace.loaded.then(() => {
println("FAILED");
},
() => {
println(`badFace.status: ${badFace.status}`); // "error"
println(`badFace.family: ${badFace.family}`); // "My Cool Font"
});
const zeroBytesFace = new FontFace("Empty Font", new ArrayBuffer(0));
await zeroBytesFace.loaded.then(() => {
println("FAILED");
},
() => {
println(`zeroBytesFace.status: ${zeroBytesFace.status}`); // "error"
println(`zeroBytesFace.family: ${zeroBytesFace.family}`); // "Empty Font"
});
const fontData = await fetch("../../../Ref/assets/HashSans.woff").then(
response => response.arrayBuffer(),
(reason) => {
println(`FAILED to fetch font from local file ${reason}`);
return new ArrayBuffer(0);
});
const hashSans = new FontFace("Hash Sans", fontData);
await hashSans.loaded.then(() => {
println(`face.status: ${hashSans.status}`); // "loaded"
println(`face.family: ${hashSans.family}`); // "Hash Sans"
},
() => {
println("FAILED");
});
done();
});
</script>

161
Userland/Libraries/LibWeb/CSS/FontFace.cpp
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@ -4,16 +4,56 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/Promise.h>
#include <LibGfx/Font/OpenType/Font.h>
#include <LibGfx/Font/VectorFont.h>
#include <LibGfx/Font/WOFF/Font.h>
#include <LibGfx/Font/WOFF2/Font.h>
#include <LibJS/Heap/Heap.h>
#include <LibJS/Runtime/ArrayBuffer.h>
#include <LibJS/Runtime/Realm.h>
#include <LibWeb/Bindings/FontFacePrototype.h>
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/CSS/FontFace.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
#include <LibWeb/Platform/EventLoopPlugin.h>
#include <LibWeb/WebIDL/AbstractOperations.h>
#include <LibWeb/WebIDL/Buffers.h>
#include <LibWeb/WebIDL/Promise.h>
namespace Web::CSS {
static NonnullRefPtr<Core::Promise<NonnullRefPtr<Gfx::VectorFont>>> load_vector_font(ByteBuffer const& data)
{
auto promise = Core::Promise<NonnullRefPtr<Gfx::VectorFont>>::construct();
// FIXME: 'Asynchronously' shouldn't mean 'later on the main thread'.
// Can we defer this to a background thread?
Platform::EventLoopPlugin::the().deferred_invoke([&data, promise] {
// FIXME: This should be de-duplicated with StyleComputer::FontLoader::try_load_font
// We don't have the luxury of knowing the MIME type, so we have to try all formats.
auto ttf = OpenType::Font::try_load_from_externally_owned_memory(data);
if (!ttf.is_error()) {
promise->resolve(ttf.release_value());
return;
}
auto woff = WOFF::Font::try_load_from_externally_owned_memory(data);
if (!woff.is_error()) {
promise->resolve(woff.release_value());
return;
}
auto woff2 = WOFF2::Font::try_load_from_externally_owned_memory(data);
if (!woff2.is_error()) {
promise->resolve(woff2.release_value());
return;
}
promise->reject(Error::from_string_literal("Automatic format detection failed"));
});
return promise;
}
JS_DEFINE_ALLOCATOR(FontFace);
template<CSS::PropertyID PropertyID>
@ -26,15 +66,115 @@ RefPtr<CSS::StyleValue const> parse_property_string(JS::Realm& realm, StringView
return maybe_parser.release_value().parse_as_css_value(PropertyID);
}
// https://drafts.csswg.org/css-font-loading/#font-face-constructor
JS::NonnullGCPtr<FontFace> FontFace::construct_impl(JS::Realm& realm, String family, FontFaceSource source, FontFaceDescriptors const& descriptors)
{
return realm.heap().allocate<FontFace>(realm, realm, move(family), move(source), descriptors);
auto& vm = realm.vm();
// 1. Let font face be a fresh FontFace object. Set font face’s status attribute to "unloaded",
// Set its internal [[FontStatusPromise]] slot to a fresh pending Promise object.
auto promise = WebIDL::create_promise(realm);
// FIXME: Parse the family argument, and the members of the descriptors argument,
// according to the grammars of the corresponding descriptors of the CSS @font-face rule.
// If the source argument is a CSSOMString, parse it according to the grammar of the CSS src descriptor of the @font-face rule.
// If any of them fail to parse correctly, reject font face’s [[FontStatusPromise]] with a DOMException named "SyntaxError",
// set font face’s corresponding attributes to the empty string, and set font face’s status attribute to "error".
// Otherwise, set font face’s corresponding attributes to the serialization of the parsed values.
// 2. (Out of order) If the source argument was a CSSOMString, set font face’s internal [[Urls]]
// slot to the string.
// If the source argument was a BinaryData, set font face’s internal [[Data]] slot
// to the passed argument.
Vector<CSS::ParsedFontFace::Source> sources;
ByteBuffer buffer;
if (auto* string = source.get_pointer<String>()) {
auto maybe_parser = CSS::Parser::Parser::create(CSS::Parser::ParsingContext(realm), *string);
if (maybe_parser.is_error()) {
WebIDL::reject_promise(realm, promise, WebIDL::SyntaxError::create(realm, "FontFace constructor: Invalid source string"_fly_string));
} else {
auto parser = maybe_parser.release_value();
sources = parser.parse_as_font_face_src();
if (sources.is_empty())
WebIDL::reject_promise(realm, promise, WebIDL::SyntaxError::create(realm, "FontFace constructor: Invalid source string"_fly_string));
}
} else {
auto buffer_source = source.get<JS::Handle<WebIDL::BufferSource>>();
auto maybe_buffer = WebIDL::get_buffer_source_copy(buffer_source->raw_object());
if (maybe_buffer.is_error()) {
VERIFY(maybe_buffer.error().code() == ENOMEM);
auto throw_completion = vm.throw_completion<JS::InternalError>(vm.error_message(JS::VM::ErrorMessage::OutOfMemory));
WebIDL::reject_promise(realm, promise, *throw_completion.value());
} else {
buffer = maybe_buffer.release_value();
}
}
FontFace::FontFace(JS::Realm& realm, String font_family, FontFaceSource, FontFaceDescriptors const& descriptors)
if (buffer.is_empty() && sources.is_empty())
WebIDL::reject_promise(realm, promise, WebIDL::SyntaxError::create(realm, "FontFace constructor: Invalid font source"_fly_string));
auto font = realm.heap().allocate<FontFace>(realm, realm, promise, move(sources), move(buffer), move(family), descriptors);
// 1. (continued) Return font face. If font face’s status is "error", terminate this algorithm;
// otherwise, complete the rest of these steps asynchronously.
if (font->status() == Bindings::FontFaceLoadStatus::Error)
return font;
// 3. If font face’s [[Data]] slot is not null, queue a task to run the following steps synchronously:
if (font->m_binary_data.is_empty())
return font;
HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*font), JS::create_heap_function(vm.heap(), [font] {
// 1. Set font face’s status attribute to "loading".
font->m_status = Bindings::FontFaceLoadStatus::Loading;
// 2. FIXME: For each FontFaceSet font face is in:
// 3. Asynchronously, attempt to parse the data in it as a font.
// When this is completed, successfully or not, queue a task to run the following steps synchronously:
font->m_font_load_promise = load_vector_font(font->m_binary_data);
font->m_font_load_promise->when_resolved([font = JS::make_handle(font)](auto const& vector_font) -> ErrorOr<void> {
HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*font), JS::create_heap_function(font->heap(), [font = JS::NonnullGCPtr(*font), vector_font] {
HTML::TemporaryExecutionContext context(HTML::relevant_settings_object(*font), HTML::TemporaryExecutionContext::CallbacksEnabled::Yes);
// 1. If the load was successful, font face now represents the parsed font;
// fulfill font face’s [[FontStatusPromise]] with font face, and set its status attribute to "loaded".
// FIXME: Are we supposed to set the properties of the FontFace based on the loaded vector font?
font->m_parsed_font = vector_font;
font->m_status = Bindings::FontFaceLoadStatus::Loaded;
WebIDL::resolve_promise(font->realm(), font->m_font_status_promise, font);
// FIXME: For each FontFaceSet font face is in:
font->m_font_load_promise = nullptr;
}));
return {};
});
font->m_font_load_promise->when_rejected([font = JS::make_handle(font)](auto const& error) {
HTML::queue_global_task(HTML::Task::Source::FontLoading, HTML::relevant_global_object(*font), JS::create_heap_function(font->heap(), [font = JS::NonnullGCPtr(*font), error = Error::copy(error)] {
HTML::TemporaryExecutionContext context(HTML::relevant_settings_object(*font), HTML::TemporaryExecutionContext::CallbacksEnabled::Yes);
// 2. Otherwise, reject font face’s [[FontStatusPromise]] with a DOMException named "SyntaxError"
// and set font face’s status attribute to "error".
font->m_status = Bindings::FontFaceLoadStatus::Error;
WebIDL::reject_promise(font->realm(), font->m_font_status_promise, WebIDL::SyntaxError::create(font->realm(), MUST(String::formatted("Failed to load font: {}", error))));
// FIXME: For each FontFaceSet font face is in:
font->m_font_load_promise = nullptr;
}));
});
}));
return font;
}
FontFace::FontFace(JS::Realm& realm, JS::NonnullGCPtr<WebIDL::Promise> font_status_promise, Vector<ParsedFontFace::Source> urls, ByteBuffer data, String font_family, FontFaceDescriptors const& descriptors)
: Bindings::PlatformObject(realm)
, m_font_status_promise(font_status_promise)
, m_urls(move(urls))
, m_binary_data(move(data))
{
// FIXME: Validate these values the same way as the setters
m_family = move(font_family);
m_style = descriptors.style;
m_weight = descriptors.weight;
@ -46,6 +186,9 @@ FontFace::FontFace(JS::Realm& realm, String font_family, FontFaceSource, FontFac
m_ascent_override = descriptors.ascent_override;
m_descent_override = descriptors.descent_override;
m_line_gap_override = descriptors.line_gap_override;
if (verify_cast<JS::Promise>(*m_font_status_promise->promise()).state() == JS::Promise::State::Rejected)
m_status = Bindings::FontFaceLoadStatus::Error;
}
void FontFace::initialize(JS::Realm& realm)
@ -55,6 +198,18 @@ void FontFace::initialize(JS::Realm& realm)
WEB_SET_PROTOTYPE_FOR_INTERFACE(FontFace);
}
void FontFace::visit_edges(JS::Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_font_status_promise);
}
JS::NonnullGCPtr<JS::Promise> FontFace::loaded() const
{
return verify_cast<JS::Promise>(*m_font_status_promise->promise());
}
// https://drafts.csswg.org/css-font-loading/#dom-fontface-family
WebIDL::ExceptionOr<void> FontFace::set_family(String const& string)
{

22
Userland/Libraries/LibWeb/CSS/FontFace.h
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@ -6,7 +6,11 @@
#pragma once
#include <LibGfx/Font/VectorFont.h>
#include <LibURL/URL.h>
#include <LibWeb/Bindings/FontFacePrototype.h>
#include <LibWeb/Bindings/PlatformObject.h>
#include <LibWeb/CSS/ParsedFontFace.h>
namespace Web::CSS {
@ -28,7 +32,7 @@ class FontFace final : public Bindings::PlatformObject {
JS_DECLARE_ALLOCATOR(FontFace);
public:
using FontFaceSource = Variant<String, JS::Handle<JS::ArrayBuffer>, JS::Handle<WebIDL::ArrayBufferView>>;
using FontFaceSource = Variant<String, JS::Handle<WebIDL::BufferSource>>;
[[nodiscard]] static JS::NonnullGCPtr<FontFace> construct_impl(JS::Realm&, String family, FontFaceSource source, FontFaceDescriptors const& descriptors);
virtual ~FontFace() override = default;
@ -66,12 +70,16 @@ public:
String line_gap_override() const { return m_line_gap_override; }
WebIDL::ExceptionOr<void> set_line_gap_override(String const&);
Bindings::FontFaceLoadStatus status() const { return m_status; }
JS::ThrowCompletionOr<JS::NonnullGCPtr<JS::Promise>> load();
JS::NonnullGCPtr<JS::Promise> loaded() const;
private:
FontFace(JS::Realm&, String family, FontFaceSource source, FontFaceDescriptors const& descriptors);
FontFace(JS::Realm&, JS::NonnullGCPtr<WebIDL::Promise> font_status_promise, Vector<ParsedFontFace::Source> urls, ByteBuffer data, String family, FontFaceDescriptors const& descriptors);
virtual void initialize(JS::Realm&) override;
virtual void visit_edges(Visitor&) override;
// FIXME: Should we be storing StyleValues instead?
String m_family;
@ -86,6 +94,16 @@ private:
String m_descent_override;
String m_line_gap_override;
// https://drafts.csswg.org/css-font-loading/#dom-fontface-status
Bindings::FontFaceLoadStatus m_status { Bindings::FontFaceLoadStatus::Unloaded };
JS::NonnullGCPtr<WebIDL::Promise> m_font_status_promise; // [[FontStatusPromise]]
Vector<ParsedFontFace::Source> m_urls; // [[Urls]]
ByteBuffer m_binary_data; // [[Data]]
RefPtr<Gfx::VectorFont> m_parsed_font;
RefPtr<Core::Promise<NonnullRefPtr<Gfx::VectorFont>>> m_font_load_promise;
// https://drafts.csswg.org/css-font-loading/#css-connected
bool m_is_css_connected { false };
};

10
Userland/Libraries/LibWeb/CSS/FontFace.idl
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@ -1,5 +1,3 @@
typedef (ArrayBuffer or ArrayBufferView) BinaryData;
dictionary FontFaceDescriptors {
CSSOMString style = "normal";
CSSOMString weight = "normal";
@ -18,8 +16,8 @@ enum FontFaceLoadStatus { "unloaded", "loading", "loaded", "error" };
// https://drafts.csswg.org/css-font-loading/#fontface-interface
[Exposed=(Window,Worker)]
interface FontFace {
// FIXME: constructor(CSSOMString family, (CSSOMString or BinaryData) source, optional FontFaceDescriptors descriptors = {});
constructor(CSSOMString family, CSSOMString source, optional FontFaceDescriptors descriptors = {});
// FIXME: BufferSource usage needs https://github.com/w3c/csswg-drafts/pull/10309
constructor(CSSOMString family, (CSSOMString or BufferSource) source, optional FontFaceDescriptors descriptors = {});
attribute CSSOMString family;
attribute CSSOMString style;
attribute CSSOMString weight;
@ -32,8 +30,8 @@ interface FontFace {
attribute CSSOMString descentOverride;
attribute CSSOMString lineGapOverride;
// FIXME: readonly attribute FontFaceLoadStatus status;
readonly attribute FontFaceLoadStatus status;
Promise<FontFace> load();
// FIXME: readonly attribute Promise<FontFace> loaded;
readonly attribute Promise<FontFace> loaded;
};

8
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
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@ -4566,7 +4566,13 @@ CSSRule* Parser::parse_font_face_rule(TokenStream<ComponentValue>& tokens)
return CSSFontFaceRule::create(m_context.realm(), ParsedFontFace { font_family.release_value(), weight, slope, move(src), move(unicode_range) });
}
Vector<ParsedFontFace::Source> Parser::parse_font_face_src(TokenStream<ComponentValue>& component_values)
Vector<ParsedFontFace::Source> Parser::parse_as_font_face_src()
{
return parse_font_face_src(m_token_stream);
}
template<typename T>
Vector<ParsedFontFace::Source> Parser::parse_font_face_src(TokenStream<T>& component_values)
{
// FIXME: Get this information from the system somehow?
// Format-name table: https://www.w3.org/TR/css-fonts-4/#font-format-definitions

6
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -69,6 +69,8 @@ public:
Optional<ComponentValue> parse_as_component_value();
Vector<ParsedFontFace::Source> parse_as_font_face_src();
static NonnullRefPtr<StyleValue> resolve_unresolved_style_value(ParsingContext const&, DOM::Element&, Optional<CSS::Selector::PseudoElement::Type>, PropertyID, UnresolvedStyleValue const&);
[[nodiscard]] LengthOrCalculated parse_as_sizes_attribute();
@ -162,7 +164,9 @@ private:
Optional<GeneralEnclosed> parse_general_enclosed(TokenStream<ComponentValue>&);
CSSRule* parse_font_face_rule(TokenStream<ComponentValue>&);
Vector<ParsedFontFace::Source> parse_font_face_src(TokenStream<ComponentValue>&);
template<typename T>
Vector<ParsedFontFace::Source> parse_font_face_src(TokenStream<T>&);
CSSRule* convert_to_rule(NonnullRefPtr<Rule>);
CSSMediaRule* convert_to_media_rule(NonnullRefPtr<Rule>);

3
Userland/Libraries/LibWeb/HTML/EventLoop/Task.h
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@ -54,6 +54,9 @@ public:
// https://w3c.github.io/permissions/#permissions-task-source
Permissions,
// https://drafts.csswg.org/css-font-loading/#task-source
FontLoading,
// !!! IMPORTANT: Keep this field last!
// This serves as the base value of all unique task sources.
// Some elements, such as the HTMLMediaElement, must have a unique task source per instance.