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LibGfx: Add first_animated_frame_index method to ImageDecoder

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Some image formats such as APNG may not use the first frame for
animations.
This commit is contained in:
Tom 2023-04-07 20:41:22 -06:00 • committed by Sam Atkins
parent 5a4c61838f
commit e7921cfe14
20 changed files with 64 additions and 4 deletions
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10
Userland/Libraries/LibGUI/ImageWidget.cpp
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@ -52,18 +52,20 @@ void ImageWidget::set_auto_resize(bool value)
// Same as ImageViewer::ViewWidget::animate(), you probably want to keep any changes in sync
void ImageWidget::animate()
{
m_current_frame_index = (m_current_frame_index + 1) % m_image_decoder->frame_count();
auto first_animated_frame_index = m_image_decoder->first_animated_frame_index();
auto total_animated_frames = m_image_decoder->frame_count() - first_animated_frame_index;
m_current_frame_index = (m_current_frame_index + 1) % total_animated_frames;
auto current_frame = m_image_decoder->frame(m_current_frame_index).release_value_but_fixme_should_propagate_errors();
auto current_frame = m_image_decoder->frame(first_animated_frame_index + m_current_frame_index).release_value_but_fixme_should_propagate_errors();
set_bitmap(current_frame.image);
if (current_frame.duration != m_timer->interval()) {
m_timer->restart(current_frame.duration);
}
if (m_current_frame_index == m_image_decoder->frame_count() - 1) {
if (m_current_frame_index == total_animated_frames - 1) {
++m_loops_completed;
if (m_loops_completed > 0 && m_loops_completed == m_image_decoder->loop_count()) {
if (m_image_decoder->loop_count() > 0 && m_loops_completed == m_image_decoder->loop_count()) {
m_timer->stop();
}
}