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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18
src/activities/reader/EpubReaderActivity.cpp
View File

@@ -6,6 +6,8 @@
#include <HalStorage.h>
#include <Logging.h>
#include <PlaceholderCoverGenerator.h>
#include "CrossPointSettings.h"
#include "CrossPointState.h"
#include "EpubReaderBookmarkSelectionActivity.h"
@@ -126,15 +128,31 @@ void EpubReaderActivity::onEnter() {
if (!Storage.exists(epub->getCoverBmpPath(false).c_str())) {
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);
}
updateProgress();
}
if (!Storage.exists(epub->getCoverBmpPath(true).c_str())) {
epub->generateCoverBmp(true);
if (!Storage.exists(epub->getCoverBmpPath(true).c_str())) {
PlaceholderCoverGenerator::generate(epub->getCoverBmpPath(true), epub->getTitle(), epub->getAuthor(), 480,
800);
}
updateProgress();
}
for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
if (!Storage.exists(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
epub->generateThumbBmp(PRERENDER_THUMB_HEIGHTS[i]);
// Fallback: generate placeholder thumbnail
if (!Storage.exists(epub->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
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);
}
updateProgress();
}
}