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fix: Port upstream cover extraction fallback and outline improvements

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Port PR #838 (epub cover fallback logic) and PR #907 (cover outlines):

- Add fallback cover filename probing when EPUB metadata lacks cover info
- Case-insensitive extension checking for cover images
- Detect and re-generate corrupt/empty thumbnail BMPs
- Always draw outline rect on cover tiles for legibility (PR #907)
- Upgrade Storage.exists() checks to Epub::isValidThumbnailBmp()
- Fallback chain: Real Cover → PlaceholderCoverGenerator → X-pattern marker
- Add epub.load retry logic (cache-only first, then full build)
- Adapt upstream Serial.printf calls to LOG_DBG/LOG_ERR macros

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
cottongin
2026-02-16 01:20:27 -05:00
parent 744d6160e8
commit b965ce9fb7
6 changed files with 400 additions and 77 deletions
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33
src/activities/reader/EpubReaderActivity.cpp
View File

@@ -131,32 +131,41 @@ void EpubReaderActivity::onEnter() {
GUI.fillPopupProgress(renderer, popupRect, completedSteps * 100 / totalSteps);
};
if (!Storage.exists(epub->getCoverBmpPath(false).c_str())) {
if (!Epub::isValidThumbnailBmp(epub->getCoverBmpPath(false))) {
epub->generateCoverBmp(false);
// Fallback: generate placeholder if real cover extraction failed
if (!Storage.exists(epub->getCoverBmpPath(false).c_str())) {
PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(false), epub->getTitle(), epub->getAuthor(), 480,
800);
if (!Epub::isValidThumbnailBmp(epub->getCoverBmpPath(false))) {
if (!PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(false), epub->getTitle(), epub->getAuthor(),
480, 800)) {
// Last resort: X-pattern marker
epub->generateInvalidFormatCoverBmp(false);
}
}
updateProgress();
}
if (!Storage.exists(epub->getCoverBmpPath(true).c_str())) {
if (!Epub::isValidThumbnailBmp(epub->getCoverBmpPath(true))) {
epub->generateCoverBmp(true);
if (!Storage.exists(epub->getCoverBmpPath(true).c_str())) {
PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(true), epub->getTitle(), epub->getAuthor(), 480,
800);
if (!Epub::isValidThumbnailBmp(epub->getCoverBmpPath(true))) {
if (!PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(true), epub->getTitle(), epub->getAuthor(),
480, 800)) {
// Last resort: X-pattern marker
epub->generateInvalidFormatCoverBmp(true);
}
}
updateProgress();
}
for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
if (!Storage.exists(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
if (!Epub::isValidThumbnailBmp(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]))) {
epub->generateThumbBmp(PRERENDER_THUMB_HEIGHTS[i]);
// Fallback: generate placeholder thumbnail
if (!Storage.exists(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
if (!Epub::isValidThumbnailBmp(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]))) {
const int thumbHeight = PRERENDER_THUMB_HEIGHTS[i];
const int thumbWidth = static_cast<int>(thumbHeight * 0.6);
PlaceholderCoverGenerator::generate(epub->getThumbBmpPath(thumbHeight), epub->getTitle(),
epub->getAuthor(), thumbWidth, thumbHeight);
if (!PlaceholderCoverGenerator::generate(epub->getThumbBmpPath(thumbHeight), epub->getTitle(),
epub->getAuthor(), thumbWidth, thumbHeight)) {
// Last resort: X-pattern marker
epub->generateInvalidFormatThumbBmp(thumbHeight);
}
}
updateProgress();
}