tsize_t TIFFReadTile(TIFF *tif, tdata_t buf, uint32_t x, uint32_t y, uint32_t z, tsample_t sample)¶
Return the data for the tile containing the specified coordinates. The
data placed in buf are returned decompressed and, typically, in the
native byte- and bit-ordering, but are otherwise packed (see further
below). The buffer must be large enough to hold an entire tile of data.
Applications should call the routine
TIFFTileSize() to find out
the size (in bytes) of a tile buffer. The x and y parameters are
always used by
TIFFReadTile(). The z parameter is used if the
image is deeper than 1 slice (
ImageDepth > 1). The sample
parameter is used only if data are organized in separate planes (
PlanarConfiguration = 2).
The library attempts to hide bit- and byte-ordering differences between
the image and the native machine by converting data to the native machine
order. Bit reversal is done if the
FillOrder tag is opposite to the
native machine bit order. 16- and 32-bit samples are automatically
byte-swapped if the file was written with a byte order opposite to the
native machine byte order.
TIFFReadTile() returns -1 if it detects an error; otherwise the
number of bytes in the decoded tile is returned.
All error messages are directed to the