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LibWeb: Use an IIFE to determine a VideoPaintable's representation

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This commit is contained in:
Zaggy1024 2025-09-12 17:36:33 -05:00 • committed by Jelle Raaijmakers
commit 861c10f37f
Notes: github-actions[bot] 2025-09-16 08:27:25 +00:00
1 changed files with 39 additions and 44 deletions
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83
Libraries/LibWeb/Painting/VideoPaintable.cpp
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@ -74,8 +74,7 @@ void VideoPaintable::paint(DisplayListRecordingContext& context, PaintPhase phas
auto current_playback_position = video_element.current_playback_position();
auto ready_state = video_element.ready_state();
enum class Representation {
Unknown,
enum class Representation : u8 {
FirstVideoFrame,
CurrentVideoFrame,
LastRenderedVideoFrame,
@ -83,50 +82,49 @@ void VideoPaintable::paint(DisplayListRecordingContext& context, PaintPhase phas
TransparentBlack,
};
auto representation = Representation::Unknown;
auto representation = [&]() {
// https://html.spec.whatwg.org/multipage/media.html#the-video-element:the-video-element-7
// A video element represents what is given for the first matching condition in the list below:
// https://html.spec.whatwg.org/multipage/media.html#the-video-element:the-video-element-7
// A video element represents what is given for the first matching condition in the list below:
// -> When no video data is available (the element's readyState attribute is either HAVE_NOTHING, or HAVE_METADATA
// but no video data has yet been obtained at all, or the element's readyState attribute is any subsequent value
// but the media resource does not have a video channel)
if (ready_state == HTML::HTMLMediaElement::ReadyState::HaveNothing
|| (ready_state >= HTML::HTMLMediaElement::ReadyState::HaveMetadata && video_element.video_tracks()->length() == 0)) {
// The video element represents its poster frame, if any, or else transparent black with no intrinsic dimensions.
return poster_frame ? Representation::PosterFrame : Representation::TransparentBlack;
}
// -> When no video data is available (the element's readyState attribute is either HAVE_NOTHING, or HAVE_METADATA
// but no video data has yet been obtained at all, or the element's readyState attribute is any subsequent value
// but the media resource does not have a video channel)
if (ready_state == HTML::HTMLMediaElement::ReadyState::HaveNothing
|| (ready_state >= HTML::HTMLMediaElement::ReadyState::HaveMetadata && video_element.video_tracks()->length() == 0)) {
// The video element represents its poster frame, if any, or else transparent black with no intrinsic dimensions.
representation = poster_frame ? Representation::PosterFrame : Representation::TransparentBlack;
}
// -> When the video element is paused, the current playback position is the first frame of video, and the element's
// show poster flag is set
if (video_element.paused() && current_playback_position == 0 && video_element.show_poster()) {
// The video element represents its poster frame, if any, or else the first frame of the video.
return poster_frame ? Representation::PosterFrame : Representation::FirstVideoFrame;
}
// -> When the video element is paused, the current playback position is the first frame of video, and the element's
// show poster flag is set
else if (video_element.paused() && current_playback_position == 0 && video_element.show_poster()) {
// The video element represents its poster frame, if any, or else the first frame of the video.
representation = poster_frame ? Representation::PosterFrame : Representation::FirstVideoFrame;
}
// -> When the video element is paused, and the frame of video corresponding to the current playback position
// is not available (e.g. because the video is seeking or buffering)
// -> When the video element is neither potentially playing nor paused (e.g. when seeking or stalled)
if (
(video_element.paused() && current_playback_position != current_frame.position)
|| (!video_element.potentially_playing() && !video_element.paused())) {
// The video element represents the last frame of the video to have been rendered.
return Representation::LastRenderedVideoFrame;
}
// -> When the video element is paused, and the frame of video corresponding to the current playback position
// is not available (e.g. because the video is seeking or buffering)
// -> When the video element is neither potentially playing nor paused (e.g. when seeking or stalled)
else if (
(video_element.paused() && current_playback_position != current_frame.position)
|| (!video_element.potentially_playing() && !video_element.paused())) {
// The video element represents the last frame of the video to have been rendered.
representation = Representation::LastRenderedVideoFrame;
}
// -> When the video element is paused
if (video_element.paused()) {
// The video element represents the frame of video corresponding to the current playback position.
return Representation::CurrentVideoFrame;
}
// -> When the video element is paused
else if (video_element.paused()) {
// The video element represents the frame of video corresponding to the current playback position.
representation = Representation::CurrentVideoFrame;
}
// -> Otherwise (the video element has a video channel and is potentially playing)
else {
// The video element represents the frame of video at the continuously increasing "current" position. When the
// current playback position changes such that the last frame rendered is no longer the frame corresponding to
// the current playback position in the video, the new frame must be rendered.
representation = Representation::CurrentVideoFrame;
}
// -> Otherwise (the video element has a video channel and is potentially playing)
//
// The video element represents the frame of video at the continuously increasing "current" position. When the
// current playback position changes such that the last frame rendered is no longer the frame corresponding to
// the current playback position in the video, the new frame must be rendered.
return Representation::CurrentVideoFrame;
}();
auto paint_frame = [&](auto const& frame) {
auto scaling_mode = to_gfx_scaling_mode(computed_values().image_rendering(), frame->rect(), video_rect.to_type<int>());
@ -173,9 +171,6 @@ void VideoPaintable::paint(DisplayListRecordingContext& context, PaintPhase phas
if (paint_user_agent_controls)
paint_placeholder_video_controls(context, video_rect, mouse_position);
break;
case Representation::Unknown:
VERIFY_NOT_REACHED();
}
}