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experiment with scanline load for tiff

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trying to get memuse down for images with huge rows-per-strip
This commit is contained in:
John Cupitt 2017-01-26 12:05:14 +00:00
parent 276fc83fa1
commit 0108d1d605
1 changed files with 14 additions and 0 deletions
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14
libvips/foreign/tiff2vips.c
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@ -2050,6 +2050,20 @@ rtiff_header_read( Rtiff *rtiff, RtiffHeader *header )
*/ */
header->rows_per_strip = header->rows_per_strip =
VIPS_CLIP( 1, header->rows_per_strip, header->height ); VIPS_CLIP( 1, header->rows_per_strip, header->height );
/* libtiff has two strip-wise readers. TIFFReadEncodedStrip()
* decompresses an entire strip to memory. It's fast, but it
* will need a lot of ram if the strip is large.
* TIFFReadScanline() reads a single scanline. It's slower, but
* will save a lot of memory if strips are large.
*
* If this image has a strip size of over 128 lines, fall back
* to TIFFReadScanline(), otherwise use TIFFReadEncodedStrip().
*/
if( header->rows_per_strip > 128 ) {
header->rows_per_strip = 1;
}
} }
return( 0 ); return( 0 );