png_get_pHYs_dpi

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
version(!PNG_VERSION_INFO_ONLY)
extern (C)
static if(PNG_INCH_CONVERSIONS_SUPPORTED)
static if(PNG_pHYs_SUPPORTED)
uint
png_get_pHYs_dpi

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