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better PNG unit handling on read

This commit is contained in:
John Cupitt 2020-07-14 16:32:02 +01:00
parent ee4610ce18
commit 740be29586
1 changed files with 3 additions and 4 deletions
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7
libvips/foreign/spngload.c
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@ -201,11 +201,10 @@ vips_foreign_load_png_set_header( VipsForeignLoadPng *png, VipsImage *image )
xres = (72.0 / 2.54 * 100.0);
yres = (72.0 / 2.54 * 100.0);
if( !spng_get_phys( png->ctx, &phys ) ) {
/* There's phys.units, but it's always 0, meaning pixels per
* metre.
/* unit 1 means pixels per metre, otherwise unspecified.
*/
xres = phys.ppu_x / 1000.0;
yres = phys.ppu_y / 1000.0;
xres = phys.units == 1 ? phys.ppu_x / 1000.0 : phys.ppu_x;
yres = phys.units == 1 ? phys.ppu_y / 1000.0 : phys.ppu_y;
}
vips_image_init_fields( image,