38 lines
1.5 KiB
C++
38 lines
1.5 KiB
C++
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#pragma once
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#include <QByteArray>
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#include <QString>
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// Turns a picked image into a file the gallery's upload API accepts.
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//
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// Three things must be true of the result: no EXIF (the gallery publishes the
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// uploaded file verbatim as its full-size download, so embedded GPS would be
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// public), a .jpg or .png extension (server.go rejects anything else, HEIC
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// included), and under nginx's 20M body cap.
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//
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// JPEG and PNG take a lossless route — whole metadata segments are dropped
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// without touching the compressed image data — so the published file keeps the
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// original sensor pixels. Anything else, or a file whose EXIF orientation must
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// be baked in, is decoded and re-encoded as JPEG (HEIC via Qt's qtimageformats
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// plugin). The strippers are a direct port of the Android app's.
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class ImagePrep
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{
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public:
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struct Prepared {
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QString filePath;
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QString note; // non-empty when the app departed from a byte-exact copy
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QString error;
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bool ok() const { return error.isEmpty(); }
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};
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// Writes the upload-ready file into cacheDir as baseName.(jpg|png).
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static Prepared prepare(const QString &sourcePath, const QString &cacheDir,
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const QString &baseName);
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private:
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static QByteArray stripJpegSegments(const QByteArray &src); // empty on parse failure
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static QByteArray stripPngChunks(const QByteArray &src);
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static bool isJpeg(const QByteArray &b);
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static bool isPng(const QByteArray &b);
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};
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