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LibWeb: Support decoding SVG favicons

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Adds a path that checks if blob contains SVG image before reaching for
image decoder.

Fixes logged image decoding errors on https://chatgpt.com/
This commit is contained in:
Aliaksandr Kalenik 2025-08-25 18:15:31 +02:00 • committed by Jelle Raaijmakers
commit 77f6edaf71
Notes: github-actions[bot] 2025-08-27 06:42:04 +00:00
3 changed files with 29 additions and 5 deletions
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30
Libraries/LibWeb/HTML/HTMLLinkElement.cpp
View file

@ -9,6 +9,7 @@
#include <AK/ByteBuffer.h>
#include <AK/Debug.h>
#include <LibGfx/ImmutableBitmap.h>
#include <LibTextCodec/Decoder.h>
#include <LibURL/URL.h>
#include <LibWeb/Bindings/HTMLLinkElementPrototype.h>
@ -34,6 +35,7 @@
#include <LibWeb/Loader/ResourceLoader.h>
#include <LibWeb/Page/Page.h>
#include <LibWeb/Platform/ImageCodecPlugin.h>
#include <LibWeb/SVG/SVGDecodedImageData.h>
namespace Web::HTML {
@ -596,8 +598,31 @@ void HTMLLinkElement::resource_did_load_favicon()
document().check_favicon_after_loading_link_resource();
}
static NonnullRefPtr<Core::Promise<Web::Platform::DecodedImage>> decode_favicon(ReadonlyBytes favicon_data, URL::URL const& favicon_url, GC::Ref<DOM::Document> document)
static NonnullRefPtr<Core::Promise<bool>> decode_favicon(ReadonlyBytes favicon_data, URL::URL const& favicon_url, GC::Ref<DOM::Document> document)
{
if (favicon_url.basename().ends_with(".svg"sv)) {
auto result = SVG::SVGDecodedImageData::create(document->realm(), document->page(), favicon_url, favicon_data);
auto promise = Core::Promise<bool>::construct();
if (result.is_error()) {
promise->reject(Error::from_string_view("Failed to decode SVG favicon"sv));
return promise;
}
// FIXME: Calculate size based on device pixel ratio
Gfx::IntSize size { 32, 32 };
auto immutable_bitmap = result.release_value()->bitmap(0, size);
auto bitmap = immutable_bitmap->bitmap();
if (!bitmap) {
promise->reject(Error::from_string_view("Failed to get bitmap from SVG favicon"sv));
return promise;
}
auto navigable = document->navigable();
if (navigable && navigable->is_traversable())
navigable->traversable_navigable()->page().client().page_did_change_favicon(*bitmap);
promise->resolve(true);
return promise;
}
auto on_failed_decode = [favicon_url]([[maybe_unused]] Error& error) {
dbgln_if(IMAGE_DECODER_DEBUG, "Failed to decode favicon {}: {}", favicon_url, error);
};
@ -614,8 +639,7 @@ static NonnullRefPtr<Core::Promise<Web::Platform::DecodedImage>> decode_favicon(
};
auto promise = Platform::ImageCodecPlugin::the().decode_image(favicon_data, move(on_successful_decode), move(on_failed_decode));
return promise;
return promise->map<bool>([](auto const&) { return true; });
}
bool HTMLLinkElement::load_favicon_and_use_if_window_is_active()

2
Libraries/LibWeb/SVG/SVGDecodedImageData.cpp
View file

@ -30,7 +30,7 @@ namespace Web::SVG {
GC_DEFINE_ALLOCATOR(SVGDecodedImageData);
GC_DEFINE_ALLOCATOR(SVGDecodedImageData::SVGPageClient);
ErrorOr<GC::Ref<SVGDecodedImageData>> SVGDecodedImageData::create(JS::Realm& realm, GC::Ref<Page> host_page, URL::URL const& url, ByteBuffer data)
ErrorOr<GC::Ref<SVGDecodedImageData>> SVGDecodedImageData::create(JS::Realm& realm, GC::Ref<Page> host_page, URL::URL const& url, ReadonlyBytes data)
{
auto page_client = SVGPageClient::create(Bindings::main_thread_vm(), host_page);
auto page = Page::create(Bindings::main_thread_vm(), *page_client);

2
Libraries/LibWeb/SVG/SVGDecodedImageData.h
View file

@ -18,7 +18,7 @@ class SVGDecodedImageData final : public HTML::DecodedImageData {
public:
class SVGPageClient;
static ErrorOr<GC::Ref<SVGDecodedImageData>> create(JS::Realm&, GC::Ref<Page>, URL::URL const&, ByteBuffer encoded_svg);
static ErrorOr<GC::Ref<SVGDecodedImageData>> create(JS::Realm&, GC::Ref<Page>, URL::URL const&, ReadonlyBytes encoded_svg);
virtual ~SVGDecodedImageData() override;
virtual RefPtr<Gfx::ImmutableBitmap> bitmap(size_t frame_index, Gfx::IntSize) const override;