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Add Epub::generateCoverBmp

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Add Epub::generateCoverBmp, only supports JPG for now
This commit is contained in:
Dave Allie 2025-12-21 17:52:33 +11:00
parent 7e6bd5f952
commit f1a8e4e00a
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GPG Key ID: F2FDDB3AD8D0276F
2 changed files with 34 additions and 2 deletions
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34
lib/Epub/Epub.cpp
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@ -1,6 +1,7 @@
#include "Epub.h"
#include <HardwareSerial.h>
#include <JpegToBmpConverter.h>
#include <SD.h>
#include <ZipFile.h>
@ -218,7 +219,38 @@ const std::string& Epub::getPath() const { return filepath; }
const std::string& Epub::getTitle() const { return title; }
const std::string& Epub::getCoverImageItem() const { return coverImageItem; }
bool Epub::generateCoverBmp() const {
// Already generated, return true
if (SD.exists((getCachePath() + "/cover.bmp").c_str())) {
return true;
}
if (coverImageItem.empty()) {
Serial.printf("[%lu] [EBP] No known cover image\n", millis());
return false;
}
if (coverImageItem.substr(coverImageItem.length() - 4) == ".jpg" ||
coverImageItem.substr(coverImageItem.length() - 5) == ".jpeg") {
Serial.printf("[%lu] [EBP] Generating BMP from JPG cover image\n", millis());
File coverJpg = SD.open((getCachePath() + "/.cover.jpg").c_str(), FILE_WRITE, true);
readItemContentsToStream(coverImageItem, coverJpg, 1024);
coverJpg.close();
coverJpg = SD.open((getCachePath() + "/.cover.jpg").c_str(), FILE_READ);
File coverBmp = SD.open((getCachePath() + "/cover.bmp").c_str(), FILE_WRITE, true);
const bool success = JpegToBmpConverter::jpegFileToBmpStream(coverJpg, coverBmp);
coverJpg.close();
coverBmp.close();
SD.remove((getCachePath() + "/.cover.jpg").c_str());
Serial.printf("[%lu] [EBP] Generated BMP from JPG cover image, success: %s\n", millis(), success ? "yes" : "no");
return success;
} else {
Serial.printf("[%lu] [EBP] Cover image is not a JPG, skipping\n", millis());
}
return false;
}
std::string normalisePath(const std::string& path) {
std::vector<std::string> components;

2
lib/Epub/Epub.h
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@ -48,7 +48,7 @@ class Epub {
const std::string& getCachePath() const;
const std::string& getPath() const;
const std::string& getTitle() const;
const std::string& getCoverImageItem() const;
bool generateCoverBmp() const;
uint8_t* readItemContentsToBytes(const std::string& itemHref, size_t* size = nullptr,
bool trailingNullByte = false) const;
bool readItemContentsToStream(const std::string& itemHref, Print& out, size_t chunkSize) const;