cottongin/crosspoint-reader-mod
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feat: Add placeholder cover generator for books without covers

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Generate styled placeholder covers (title, author, book icon) when a
book has no embedded cover image, instead of showing a blank rectangle.

- Add PlaceholderCoverGenerator lib with 1-bit BMP rendering, scaled
  fonts, word-wrap, and a book icon bitmap
- Integrate as fallback in Epub/Xtc/Txt reader activities and
  SleepActivity after format-specific cover generation fails
- Add fallback in HomeActivity::loadRecentCovers() so the home screen
  also shows placeholder thumbnails when cache is cleared
- Add Txt::getThumbBmpPath() for TXT thumbnail support
- Add helper scripts for icon and layout preview generation

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
cottongin
2026-02-14 23:38:47 -05:00
parent 5dc9d21bdb
commit 632b76c9ed
12 changed files with 939 additions and 38 deletions
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51
src/activities/home/HomeActivity.cpp
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@@ -5,6 +5,7 @@
#include <GfxRenderer.h>
#include <HalStorage.h>
#include <Utf8.h>
#include <PlaceholderCoverGenerator.h>
#include <Xtc.h>
#include <cstring>
@@ -65,45 +66,35 @@ void HomeActivity::loadRecentCovers(int coverHeight) {
if (!book.coverBmpPath.empty()) {
std::string coverPath = UITheme::getCoverThumbPath(book.coverBmpPath, coverHeight);
if (!Storage.exists(coverPath.c_str())) {
// If epub, try to load the metadata for title/author and cover
if (!showingLoading) {
showingLoading = true;
popupRect = GUI.drawPopup(renderer, "Loading...");
}
GUI.fillPopupProgress(renderer, popupRect, 10 + progress * (90 / recentBooks.size()));
bool success = false;
// Try format-specific thumbnail generation first
if (StringUtils::checkFileExtension(book.path, ".epub")) {
Epub epub(book.path, "/.crosspoint");
// Skip loading css since we only need metadata here
epub.load(false, true);
// Try to generate thumbnail image for Continue Reading card
if (!showingLoading) {
showingLoading = true;
popupRect = GUI.drawPopup(renderer, "Loading...");
}
GUI.fillPopupProgress(renderer, popupRect, 10 + progress * (90 / recentBooks.size()));
bool success = epub.generateThumbBmp(coverHeight);
if (!success) {
RECENT_BOOKS.updateBook(book.path, book.title, book.author, "");
book.coverBmpPath = "";
}
coverRendered = false;
updateRequired = true;
success = epub.generateThumbBmp(coverHeight);
} else if (StringUtils::checkFileExtension(book.path, ".xtch") ||
StringUtils::checkFileExtension(book.path, ".xtc")) {
// Handle XTC file
Xtc xtc(book.path, "/.crosspoint");
if (xtc.load()) {
// Try to generate thumbnail image for Continue Reading card
if (!showingLoading) {
showingLoading = true;
popupRect = GUI.drawPopup(renderer, "Loading...");
}
GUI.fillPopupProgress(renderer, popupRect, 10 + progress * (90 / recentBooks.size()));
bool success = xtc.generateThumbBmp(coverHeight);
if (!success) {
RECENT_BOOKS.updateBook(book.path, book.title, book.author, "");
book.coverBmpPath = "";
}
coverRendered = false;
updateRequired = true;
success = xtc.generateThumbBmp(coverHeight);
}
}
// Fallback: generate a placeholder thumbnail with title/author
if (!success && !Storage.exists(coverPath.c_str())) {
const int thumbWidth = static_cast<int>(coverHeight * 0.6);
PlaceholderCoverGenerator::generate(coverPath, book.title, book.author, thumbWidth, coverHeight);
}
coverRendered = false;
updateRequired = true;
}
}
progress++;