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try speeding up jump_to_page

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This commit is contained in:
silverweed 2025-01-22 11:30:10 +01:00
parent c664d461aa
commit 84a9266f4b
1 changed files with 31 additions and 5 deletions

36
src/render.cpp
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@ -178,11 +178,37 @@ Page_Info_Node *viewer_jump_to_page(App_State &app, u64 page_idx)
return nullptr;
page_idx = (page_idx + app.rndata.n_pages) % app.rndata.n_pages;
// @Speed
Page_Info_Node *page = app.rndata.pages;
for (u64 i = 0; i < page_idx; ++i) {
page = page->next;
assert(page);
// // @Speed
// Page_Info_Node *page = app.rndata.pages;
// for (u64 i = 0; i < page_idx; ++i) {
// page = page->next;
// assert(page);
// }
// Find the page_idx-th page. We could just iterate n times over the pages list,
// but skimming through the clusters first should be faster in most cases.
Page_Info_Node *page = nullptr;
for (u64 i = 0; i < app.rndata.n_clusters - 1; ++i) {
const Cluster_Info &cluster = app.rndata.clusters[i];
const Cluster_Info &next_cluster = app.rndata.clusters[i];
if (cluster.first_page_idx <= page_idx && page_idx < next_cluster.first_page_idx) {
u64 idx_in_cluster = page_idx - cluster.first_page_idx;
page = cluster.first_page;
for (u64 j = 0; j < idx_in_cluster; ++j) {
page = page->next;
}
break;
}
}
if (!page) {
// page was not in the first N - 1 clusters, so it must be in the last one.
const Cluster_Info &cluster = app.rndata.clusters[app.rndata.n_clusters - 1];
assert(page_idx >= cluster.first_page_idx);
u64 idx_in_cluster = page_idx - cluster.first_page_idx;
page = cluster.first_page;
for (u64 j = 0; j < idx_in_cluster; ++j) {
page = page->next;
}
}
app.viewer.latest_page_gone_to = page_idx;