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76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
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/*
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/Timer.h>
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#include <LibWeb/HTML/TraversableNavigable.h>
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#include <WebContent/BackingStoreManager.h>
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#include <WebContent/PageClient.h>
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namespace WebContent {
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BackingStoreManager::BackingStoreManager(PageClient& page_client)
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: m_page_client(page_client)
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{
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m_backing_store_shrink_timer = Core::Timer::create_single_shot(3000, [this] {
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resize_backing_stores_if_needed(WindowResizingInProgress::No);
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});
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}
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void BackingStoreManager::restart_resize_timer()
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{
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m_backing_store_shrink_timer->restart();
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}
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void BackingStoreManager::resize_backing_stores_if_needed(WindowResizingInProgress window_resize_in_progress)
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{
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auto css_pixels_viewport_rect = m_page_client.page().top_level_traversable()->viewport_rect();
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auto viewport_size = m_page_client.page().css_to_device_rect(css_pixels_viewport_rect).size();
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if (viewport_size.is_empty())
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return;
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Web::DevicePixelSize minimum_needed_size;
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if (window_resize_in_progress == WindowResizingInProgress::Yes) {
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// Pad the minimum needed size so that we don't have to keep reallocating backing stores while the window is being resized.
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minimum_needed_size = { viewport_size.width() + 256, viewport_size.height() + 256 };
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} else {
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// If we're not in the middle of a resize, we can shrink the backing store size to match the viewport size.
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minimum_needed_size = viewport_size;
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m_front_bitmap.clear();
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m_back_bitmap.clear();
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}
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auto old_front_bitmap_id = m_front_bitmap_id;
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auto old_back_bitmap_id = m_back_bitmap_id;
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auto reallocate_backing_store_if_needed = [&](RefPtr<Gfx::Bitmap>& bitmap, int& id) {
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if (!bitmap || !bitmap->size().contains(minimum_needed_size.to_type<int>())) {
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if (auto new_bitmap_or_error = Gfx::Bitmap::create_shareable(Gfx::BitmapFormat::BGRA8888, minimum_needed_size.to_type<int>()); !new_bitmap_or_error.is_error()) {
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bitmap = new_bitmap_or_error.release_value();
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id = m_next_bitmap_id++;
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}
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}
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};
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reallocate_backing_store_if_needed(m_front_bitmap, m_front_bitmap_id);
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reallocate_backing_store_if_needed(m_back_bitmap, m_back_bitmap_id);
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auto& front_bitmap = m_front_bitmap;
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auto& back_bitmap = m_back_bitmap;
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if (m_front_bitmap_id != old_front_bitmap_id || m_back_bitmap_id != old_back_bitmap_id) {
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m_page_client.page_did_allocate_backing_stores(m_front_bitmap_id, front_bitmap->to_shareable_bitmap(), m_back_bitmap_id, back_bitmap->to_shareable_bitmap());
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}
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}
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void BackingStoreManager::swap_back_and_front()
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{
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swap(m_front_bitmap, m_back_bitmap);
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swap(m_front_bitmap_id, m_back_bitmap_id);
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}
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}
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