Add support for embedded single channel previews, fixes #4419
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@@ -113,7 +113,7 @@ public:
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virtual int getBPS () = 0;
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virtual void getScanline (int row, unsigned char* buffer, int bps) {}
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virtual void setScanline (int row, unsigned char* buffer, int bps, float minValue[3] = nullptr, float maxValue[3] = nullptr) {}
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virtual void setScanline (int row, unsigned char* buffer, int bps, unsigned int numSamples = 3, float minValue[3] = nullptr, float maxValue[3] = nullptr) {}
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virtual bool readImage (Glib::ustring &fname, FILE *fh)
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{
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