LibWeb: Piggyback on HTML::ImageRequest in CSS ImageStyleValue

This is all ad-hoc since no spec currently exists for this behavior.
Basically, ImageStyleValue now uses ImageRequest for fetching and
decoding of images.

This already leads to visible improvements on many websites.

Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
  * Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
  * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
  * Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
@@ -11,7 +11,9 @@
 #include <LibWeb/CSS/ComputedValues.h>
 #include <LibWeb/CSS/Serialize.h>
 #include <LibWeb/DOM/Document.h>
-#include <LibWeb/Loader/ResourceLoader.h>
+#include <LibWeb/HTML/DecodedImageData.h>
+#include <LibWeb/HTML/ImageRequest.h>
+#include <LibWeb/HTML/PotentialCORSRequest.h>
 #include <LibWeb/Painting/PaintContext.h>
 #include <LibWeb/Platform/Timer.h>
 
@@ -25,41 +27,59 @@ ImageStyleValue::ImageStyleValue(AK::URL const& url)
 
 void ImageStyleValue::load_any_resources(DOM::Document& document)
 {
-    if (resource())
+    if (m_image_request)
         return;
-
     m_document = &document;
-    auto request = LoadRequest::create_for_url_on_page(m_url, document.page());
-    set_resource(ResourceLoader::the().load_resource(Resource::Type::Image, request));
-}
 
-void ImageStyleValue::resource_did_load()
-{
-    if (!m_document)
+    m_image_request = HTML::ImageRequest::get_shareable_or_create(*document.page(), m_url).release_value_but_fixme_should_propagate_errors();
+    m_image_request->add_callbacks(
+        [this, weak_this = make_weak_ptr()] {
+            if (!weak_this)
+                return;
+
+            if (!m_document)
+                return;
+
+            // FIXME: Do less than a full repaint if possible?
+            if (auto* browsing_context = m_document->browsing_context())
+                browsing_context->set_needs_display();
+
+            auto image_data = m_image_request->image_data();
+            if (image_data->is_animated() && image_data->frame_count() > 1) {
+                m_timer = Platform::Timer::create();
+                m_timer->set_interval(image_data->frame_duration(0));
+                m_timer->on_timeout = [this] { animate(); };
+                m_timer->start();
+            }
+        },
+        nullptr);
+
+    // If the image request is already available or fetching, no need to start another fetch.
+    if (m_image_request->is_available() || m_image_request->fetch_controller())
         return;
-    // FIXME: Do less than a full repaint if possible?
-    if (m_document && m_document->browsing_context())
-        m_document->browsing_context()->set_needs_display();
-
-    if (resource()->is_animated() && resource()->frame_count() > 1) {
-        m_timer = Platform::Timer::create();
-        m_timer->set_interval(resource()->frame_duration(0));
-        m_timer->on_timeout = [this] { animate(); };
-        m_timer->start();
-    }
+
+    auto request = HTML::create_potential_CORS_request(document.vm(), m_url, Fetch::Infrastructure::Request::Destination::Image, HTML::CORSSettingAttribute::NoCORS);
+    request->set_client(&document.relevant_settings_object());
+    m_image_request->fetch_image(document.realm(), request);
 }
 
 void ImageStyleValue::animate()
 {
-    m_current_frame_index = (m_current_frame_index + 1) % resource()->frame_count();
-    auto current_frame_duration = resource()->frame_duration(m_current_frame_index);
+    if (!m_image_request)
+        return;
+    auto image_data = m_image_request->image_data();
+    if (!image_data)
+        return;
+
+    m_current_frame_index = (m_current_frame_index + 1) % image_data->frame_count();
+    auto current_frame_duration = image_data->frame_duration(m_current_frame_index);
 
     if (current_frame_duration != m_timer->interval())
         m_timer->restart(current_frame_duration);
 
-    if (m_current_frame_index == resource()->frame_count() - 1) {
+    if (m_current_frame_index == image_data->frame_count() - 1) {
         ++m_loops_completed;
-        if (m_loops_completed > 0 && m_loops_completed == resource()->loop_count())
+        if (m_loops_completed > 0 && m_loops_completed == image_data->loop_count())
             m_timer->stop();
     }
 
@@ -67,11 +87,16 @@ void ImageStyleValue::animate()
         on_animate();
 }
 
-Gfx::Bitmap const* ImageStyleValue::bitmap(size_t frame_index) const
+bool ImageStyleValue::is_paintable() const
 {
-    if (!resource())
-        return nullptr;
-    return resource()->bitmap(frame_index);
+    return image_data();
+}
+
+Gfx::Bitmap const* ImageStyleValue::bitmap(size_t frame_index, Gfx::IntSize size) const
+{
+    if (auto image_data = this->image_data())
+        return image_data->bitmap(frame_index, size);
+    return nullptr;
 }
 
 ErrorOr<String> ImageStyleValue::to_string() const
@@ -88,24 +113,31 @@ bool ImageStyleValue::equals(StyleValue const& other) const
 
 Optional<CSSPixels> ImageStyleValue::natural_width() const
 {
-    if (auto* b = bitmap(0); b != nullptr)
-        return b->width();
+    if (auto image_data = this->image_data())
+        return image_data->intrinsic_width();
     return {};
 }
 
 Optional<CSSPixels> ImageStyleValue::natural_height() const
 {
-    if (auto* b = bitmap(0); b != nullptr)
-        return b->height();
+    if (auto image_data = this->image_data())
+        return image_data->intrinsic_height();
     return {};
 }
 
 void ImageStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering) const
 {
-    if (auto* b = bitmap(m_current_frame_index); b != nullptr) {
-        auto scaling_mode = to_gfx_scaling_mode(image_rendering, bitmap(0)->rect(), dest_rect.to_type<int>());
-        context.painter().draw_scaled_bitmap(dest_rect.to_type<int>(), *b, bitmap(0)->rect(), 1.f, scaling_mode);
+    if (auto const* b = bitmap(m_current_frame_index, dest_rect.size().to_type<int>()); b != nullptr) {
+        auto scaling_mode = to_gfx_scaling_mode(image_rendering, b->rect(), dest_rect.to_type<int>());
+        context.painter().draw_scaled_bitmap(dest_rect.to_type<int>(), *b, b->rect(), 1.f, scaling_mode);
     }
 }
 
+RefPtr<HTML::DecodedImageData const> ImageStyleValue::image_data() const
+{
+    if (!m_image_request)
+        return nullptr;
+    return m_image_request->image_data();
+}
+
 }

Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.h

@@ -12,13 +12,12 @@
 #include <AK/URL.h>
 #include <LibWeb/CSS/Enums.h>
 #include <LibWeb/CSS/StyleValues/AbstractImageStyleValue.h>
-#include <LibWeb/Loader/ImageResource.h>
 
 namespace Web::CSS {
 
 class ImageStyleValue final
     : public AbstractImageStyleValue
-    , public ImageResourceClient {
+    , public Weakable<ImageStyleValue> {
 public:
     static ErrorOr<ValueComparingNonnullRefPtr<ImageStyleValue>> create(AK::URL const& url)
     {
@@ -34,19 +33,20 @@ public:
     Optional<CSSPixels> natural_width() const override;
     Optional<CSSPixels> natural_height() const override;
 
-    bool is_paintable() const override { return bitmap(0) != nullptr; }
+    virtual bool is_paintable() const override;
     void paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering) const override;
 
     Function<void()> on_animate;
 
+    RefPtr<HTML::DecodedImageData const> image_data() const;
+
 private:
     ImageStyleValue(AK::URL const&);
 
-    // ^ResourceClient
-    virtual void resource_did_load() override;
+    RefPtr<HTML::ImageRequest> m_image_request;
 
     void animate();
-    Gfx::Bitmap const* bitmap(size_t index) const;
+    Gfx::Bitmap const* bitmap(size_t frame_index, Gfx::IntSize = {}) const;
 
     AK::URL m_url;
     WeakPtr<DOM::Document> m_document;