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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48
src/activities/reader/TxtReaderActivity.cpp
View File

@@ -5,6 +5,8 @@
#include <Serialization.h>
#include <Utf8.h>
#include <PlaceholderCoverGenerator.h>
#include "CrossPointSettings.h"
#include "CrossPointState.h"
#include "MappedInputManager.h"
@@ -57,13 +59,43 @@ void TxtReaderActivity::onEnter() {
txt->setupCacheDir();
// Prerender cover on first open so the Sleep screen is instant.
// generateCoverBmp() is a no-op if the file already exists, so this only does work once.
// TXT has no thumbnail support, so only the sleep screen cover is generated.
if (!Storage.exists(txt->getCoverBmpPath().c_str())) {
Rect popupRect = GUI.drawPopup(renderer, "Preparing book...");
txt->generateCoverBmp();
GUI.fillPopupProgress(renderer, popupRect, 100);
// 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(txt->getCoverBmpPath().c_str())) totalSteps++;
for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
if (!Storage.exists(txt->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(txt->getCoverBmpPath().c_str())) {
const bool coverGenerated = txt->generateCoverBmp();
// Fallback: generate placeholder if no cover image was found
if (!coverGenerated) {
PlaceholderCoverGenerator::generate(txt->getCoverBmpPath(), txt->getTitle(), "", 480, 800);
}
updateProgress();
}
for (int i = 0; i < PRERENDER_THUMB_HEIGHTS_COUNT; i++) {
if (!Storage.exists(txt->getThumbBmpPath(PRERENDER_THUMB_HEIGHTS[i]).c_str())) {
// TXT has no native thumbnail generation, always use placeholder
const int thumbHeight = PRERENDER_THUMB_HEIGHTS[i];
const int thumbWidth = static_cast<int>(thumbHeight * 0.6);
PlaceholderCoverGenerator::generate(txt->getThumbBmpPath(thumbHeight), txt->getTitle(), "", thumbWidth,
thumbHeight);
updateProgress();
}
}
}
}
// Save current txt as last opened file and add to recent books
@@ -71,7 +103,7 @@ void TxtReaderActivity::onEnter() {
auto fileName = filePath.substr(filePath.rfind('/') + 1);
APP_STATE.openEpubPath = filePath;
APP_STATE.saveToFile();
RECENT_BOOKS.addBook(filePath, fileName, "", "");
RECENT_BOOKS.addBook(filePath, fileName, "", txt->getThumbBmpPath());
// Trigger first update
updateRequired = true;