Commits on May 4, 2020

1. Avoid tesseract writing Pix out/reading them back. …

   By default, when we ImageData::SetPix, we write the data out as a
   PNG, just to read it back in to get a compressed buffer of data.
   We then use this to generate a new Pix.
   
   In builds of Tesseract on systems where we don't have temp files,
   writing files out is problematic.
   
   Not only that, but compressing/uncompressing is slow, and on minimal
   builds of leptonica, where we've disabled the format writers to reduce
   memory footprint, we get no compression anyway.
   
   In such cases, it'd be far nicer just to keep the original Pix as
   the internal data.
   
   Also, when recovering the pixmap from the ImageData, if we know we're
   only going to read from the data, we can avoid duplicating it and
   just use the original. This is exactly the case when GRAPHICS_DISABLED
   is set.
   
   So, introduce a TESSERACT_IMAGEDATA_AS_PIX predefine that we can use
   to cause the internal data to be a Pix rather than a compressed
   buffer.
   
   
   
   Given we don't do compression, and they were writing to memory,
   this was all just more effort than we needed.
   
   Also, if we're using GRAPHICS_DISABLED, we might as well just
   pixCopy rather than pixClone as only the scaler uses this.

   

   robinwatts committed May 4, 2020
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