cottongin/crosspoint-reader-mod
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prerender book covers and thumbnails when opening a book for the first time

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Moves cover/thumbnail generation from lazy (Home screen, Sleep screen) into
each reader activity's onEnter(). On first open, generates all needed BMPs
(cover, cover_crop, thumbnails for all theme heights) with a "Preparing
book..." progress popup. Subsequent opens skip instantly when files exist.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
cottongin
2026-02-12 16:13:55 -05:00
parent e798065a5c
commit 905f694576
4 changed files with 81 additions and 0 deletions
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31
src/activities/reader/XtcReaderActivity.cpp
View File

@@ -43,6 +43,37 @@ void XtcReaderActivity::onEnter() {
// Load saved progress
loadProgress();
// Prerender covers and thumbnails on first open so Home and Sleep screens are instant.
// Each generate* call is a no-op if the file already exists, so this only does work once.
{
int totalSteps = 0;
if (!Storage.exists(xtc->getCoverBmpPath().c_str())) totalSteps++;
for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
if (!Storage.exists(xtc->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) totalSteps++;
}
if (totalSteps > 0) {
Rect popupRect = GUI.drawPopup(renderer, "Preparing book...");
int completedSteps = 0;
auto updateProgress = [&]() {
completedSteps++;
GUI.fillPopupProgress(renderer, popupRect, completedSteps * 100 / totalSteps);
};
if (!Storage.exists(xtc->getCoverBmpPath().c_str())) {
xtc->generateCoverBmp();
updateProgress();
}
for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
if (!Storage.exists(xtc->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
xtc->generateThumbBmp(PRERENDER_THUMB_HEIGHTS[i]);
updateProgress();
}
}
}
}
// Save current XTC as last opened book and add to recent books
APP_STATE.openEpubPath = xtc->getPath();
APP_STATE.saveToFile();