snark13/Xteink-X4-crosspoint-reader
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Caching of spine item sizes for faster book loading (saves 1-4 seconds). (#54)
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As discussed in
https://github.com/daveallie/crosspoint-reader/pull/38#issuecomment-3665142427,
#38
This commit is contained in:
Jonas Diemer 2025-12-18 12:49:14 +01:00 committed by GitHub
parent 57fdb1c0fb
commit 424594488f
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3 changed files with 45 additions and 13 deletions
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55
lib/Epub/Epub.cpp
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@ -148,23 +148,54 @@ bool Epub::load() {
return false;
}
// determine size of spine items
size_t spineItemsCount = getSpineItemsCount();
size_t spineItemsSize = 0;
for (size_t i = 0; i < spineItemsCount; i++) {
std::string spineItem = getSpineItem(i);
size_t s = 0;
getItemSize(spineItem, &s);
spineItemsSize += s;
cumulativeSpineItemSize.emplace_back(spineItemsSize);
}
Serial.printf("[%lu] [EBP] Book size: %u\n", millis(), spineItemsSize);
initializeSpineItemSizes();
Serial.printf("[%lu] [EBP] Loaded ePub: %s\n", millis(), filepath.c_str());
return true;
}
void Epub::initializeSpineItemSizes() {
setupCacheDir();
size_t spineItemsCount = getSpineItemsCount();
size_t cumSpineItemSize = 0;
if (SD.exists((getCachePath() + "/spine_size.bin").c_str())) {
File f = SD.open((getCachePath() + "/spine_size.bin").c_str());
uint8_t data[4];
for (size_t i = 0; i < spineItemsCount; i++) {
f.read(data, 4);
cumSpineItemSize = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
cumulativeSpineItemSize.emplace_back(cumSpineItemSize);
// Serial.printf("[%lu] [EBP] Loading item %d size %u to %u %u\n", millis(),
// i, cumSpineItemSize, data[1], data[0]);
}
f.close();
} else {
File f = SD.open((getCachePath() + "/spine_size.bin").c_str(), FILE_WRITE);
uint8_t data[4];
// determine size of spine items
for (size_t i = 0; i < spineItemsCount; i++) {
std::string spineItem = getSpineItem(i);
size_t s = 0;
getItemSize(spineItem, &s);
cumSpineItemSize += s;
cumulativeSpineItemSize.emplace_back(cumSpineItemSize);
// and persist to cache
data[0] = cumSpineItemSize & 0xFF;
data[1] = (cumSpineItemSize >> 8) & 0xFF;
data[2] = (cumSpineItemSize >> 16) & 0xFF;
data[3] = (cumSpineItemSize >> 24) & 0xFF;
// Serial.printf("[%lu] [EBP] Persisting item %d size %u to %u %u\n", millis(),
// i, cumSpineItemSize, data[1], data[0]);
f.write(data, 4);
}
f.close();
}
Serial.printf("[%lu] [EBP] Book size: %lu\n", millis(), cumSpineItemSize);
}
bool Epub::clearCache() const {
if (!SD.exists(cachePath.c_str())) {
Serial.printf("[%lu] [EPB] Cache does not exist, no action needed\n", millis());

1
lib/Epub/Epub.h
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@ -32,6 +32,7 @@ class Epub {
bool findContentOpfFile(std::string* contentOpfFile) const;
bool parseContentOpf(const std::string& contentOpfFilePath);
bool parseTocNcxFile();
void initializeSpineItemSizes();
public:
explicit Epub(std::string filepath, const std::string& cacheDir) : filepath(std::move(filepath)) {

2
src/main.cpp
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@ -216,7 +216,7 @@ void loop() {
return;
}
if (inputManager.wasReleased(InputManager::BTN_POWER) && inputManager.getHeldTime() > POWER_BUTTON_WAKEUP_MS) {
if (inputManager.wasReleased(InputManager::BTN_POWER) && inputManager.getHeldTime() > POWER_BUTTON_SLEEP_MS) {
enterDeepSleep();
// This should never be hit as `enterDeepSleep` calls esp_deep_sleep_start
return;