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MM and II 16 bit integer tiffs unpack properly using libtiff on bigendian platform

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This commit is contained in:
Eric Soroos 2013-10-21 22:17:33 +00:00
parent 1945fecdb6
commit 6f8d968cbb
3 changed files with 32 additions and 1 deletions
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6
PIL/TiffImagePlugin.py
View File

@ -804,6 +804,12 @@ class TiffImageFile(ImageFile.ImageFile):
# fillorder==2 modes have a corresponding
# fillorder=1 mode
self.mode, rawmode = OPEN_INFO[key]
# libtiff always returns the bytes in native order.
# we're expecting image byte order. So, if the rawmode
# contains I;16, we need to convert from native to image
# byte order.
if self.mode in ('I;16B', 'I;16'):
rawmode = 'I;16N'
# Offset in the tile tuple is 0, we go from 0,0 to
# w,h, and we only do this once -- eds

3
libImaging/Storage.c
View File

@ -105,7 +105,8 @@ ImagingNewPrologueSubtype(const char *mode, unsigned xsize, unsigned ysize,
im->linesize = xsize * 4;
im->type = IMAGING_TYPE_INT32;
} else if (strcmp(mode, "I;16") == 0 || strcmp(mode, "I;16L") == 0 || strcmp(mode, "I;16B") == 0) {
} else if (strcmp(mode, "I;16") == 0 || strcmp(mode, "I;16L") == 0 \
|| strcmp(mode, "I;16B") == 0 || strcmp(mode, "I;16N") == 0) {
/* EXPERIMENTAL */
/* 16-bit raw integer images */
im->bands = 1;

24
libImaging/Unpack.c
View File

@ -775,6 +775,26 @@ ImagingUnpackLAB(UINT8* out, const UINT8* in, int pixels)
}
}
static void
unpackI16N_I16B(UINT8* out, const UINT8* in, int pixels){
int i;
UINT8* tmp = (UINT8*) out;
for (i = 0; i < pixels; i++) {
C16B;
in += 2; tmp += 2;
}
}
static void
unpackI16N_I16(UINT8* out, const UINT8* in, int pixels){
int i;
UINT8* tmp = (UINT8*) out;
for (i = 0; i < pixels; i++) {
C16L;
in += 2; tmp += 2;
}
}
static void
copy1(UINT8* out, const UINT8* in, int pixels)
{
@ -1139,6 +1159,10 @@ static struct {
{"I;16B", "I;16B", 16, copy2},
{"I;16L", "I;16L", 16, copy2},
{"I;16", "I;16N", 16, unpackI16N_I16}, // LibTiff native->image endian.
{"I;16L", "I;16N", 16, unpackI16N_I16}, // LibTiff native->image endian.
{"I;16B", "I;16N", 16, unpackI16N_I16B},
{NULL} /* sentinel */
};