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Add support for reading TIFFs with PlanarConfiguration=2

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This commit is contained in:
Konstantin Kopachev 2020-05-23 09:24:41 -07:00
parent e1e77ff735
commit f566c8a7d3
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GPG Key ID: CECF757E656F4F62
10 changed files with 333 additions and 42 deletions
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Tests/images/tiff_strip_planar_16bit_RGB.tiff Normal file
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Tests/images/tiff_strip_planar_16bit_RGBa.tiff Normal file
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Tests/images/tiff_strip_planar_lzw.tiff Normal file
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Tests/images/tiff_tiled_planar_16bit_RGB.tiff Normal file
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Tests/images/tiff_tiled_planar_16bit_RGBa.tiff Normal file
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Tests/images/tiff_tiled_planar_lzw.tiff Normal file
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46
Tests/test_file_libtiff.py
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@ -843,6 +843,52 @@ class TestFileLibTiff(LibTiffTestCase):
with Image.open(infile) as im:
assert_image_similar_tofile(im, "Tests/images/flower.jpg", 0.5)
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_strip_planar_rgb(self):
# gdal_translate -co TILED=no -co INTERLEAVE=BAND -co COMPRESS=LZW \
# tiff_strip_raw.tif tiff_strip_planar_lzw.tiff
infile = "Tests/images/tiff_strip_planar_lzw.tiff"
with Image.open(infile) as im:
assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_tiled_planar_rgb(self):
# gdal_translate -co TILED=yes -co INTERLEAVE=BAND -co COMPRESS=LZW \
# tiff_tiled_raw.tif tiff_tiled_planar_lzw.tiff
infile = "Tests/images/tiff_tiled_planar_lzw.tiff"
with Image.open(infile) as im:
assert_image_equal_tofile(im, "Tests/images/tiff_adobe_deflate.png")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_tiled_planar_16bit_RGB(self):
# gdal_translate -co TILED=yes -co INTERLEAVE=BAND -co COMPRESS=LZW \
# tiff_16bit_RGB.tiff tiff_tiled_planar_16bit_RGB.tiff
with Image.open("Tests/images/tiff_tiled_planar_16bit_RGB.tiff") as im:
assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGB_target.png")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_strip_planar_16bit_RGB(self):
# gdal_translate -co TILED=no -co INTERLEAVE=BAND -co COMPRESS=LZW \
# tiff_16bit_RGB.tiff tiff_strip_planar_16bit_RGB.tiff
with Image.open("Tests/images/tiff_strip_planar_16bit_RGB.tiff") as im:
assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGB_target.png")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_tiled_planar_16bit_RGBa(self):
# gdal_translate -co TILED=yes \
# -co INTERLEAVE=BAND -co COMPRESS=LZW -co ALPHA=PREMULTIPLIED \
# tiff_16bit_RGBa.tiff tiff_tiled_planar_16bit_RGBa.tiff
with Image.open("Tests/images/tiff_tiled_planar_16bit_RGBa.tiff") as im:
assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGBa_target.png")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_strip_planar_16bit_RGBa(self):
# gdal_translate -co TILED=no \
# -co INTERLEAVE=BAND -co COMPRESS=LZW -co ALPHA=PREMULTIPLIED \
# tiff_16bit_RGBa.tiff tiff_strip_planar_16bit_RGBa.tiff
with Image.open("Tests/images/tiff_strip_planar_16bit_RGBa.tiff") as im:
assert_image_equal_tofile(im, "Tests/images/tiff_16bit_RGBa_target.png")
@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
def test_old_style_jpeg(self):
infile = "Tests/images/old-style-jpeg-compression.tif"

54
Tests/test_lib_pack.py
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@ -320,6 +320,23 @@ class TestLibUnpack:
self.assert_unpack("RGB", "G", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
self.assert_unpack("RGB", "B", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))
self.assert_unpack("RGB", "R;16B", 2, (1, 0, 0), (3, 0, 0), (5, 0, 0))
self.assert_unpack("RGB", "G;16B", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
self.assert_unpack("RGB", "B;16B", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))
self.assert_unpack("RGB", "R;16L", 2, (2, 0, 0), (4, 0, 0), (6, 0, 0))
self.assert_unpack("RGB", "G;16L", 2, (0, 2, 0), (0, 4, 0), (0, 6, 0))
self.assert_unpack("RGB", "B;16L", 2, (0, 0, 2), (0, 0, 4), (0, 0, 6))
if sys.byteorder == "little":
self.assert_unpack("RGB", "R;16N", 2, (2, 0, 0), (4, 0, 0), (6, 0, 0))
self.assert_unpack("RGB", "G;16N", 2, (0, 2, 0), (0, 4, 0), (0, 6, 0))
self.assert_unpack("RGB", "B;16N", 2, (0, 0, 2), (0, 0, 4), (0, 0, 6))
else:
self.assert_unpack("RGB", "R;16N", 2, (1, 0, 0), (3, 0, 0), (5, 0, 0))
self.assert_unpack("RGB", "G;16N", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
self.assert_unpack("RGB", "B;16N", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))
def test_RGBA(self):
self.assert_unpack("RGBA", "LA", 2, (1, 1, 1, 2), (3, 3, 3, 4), (5, 5, 5, 6))
self.assert_unpack(
@ -450,6 +467,43 @@ class TestLibUnpack:
self.assert_unpack("RGBA", "B", 1, (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
self.assert_unpack("RGBA", "A", 1, (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))
self.assert_unpack("RGBA", "R;16B", 2, (1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0))
self.assert_unpack("RGBA", "G;16B", 2, (0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0))
self.assert_unpack("RGBA", "B;16B", 2, (0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0))
self.assert_unpack("RGBA", "A;16B", 2, (0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5))
self.assert_unpack("RGBA", "R;16L", 2, (2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0))
self.assert_unpack("RGBA", "G;16L", 2, (0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0))
self.assert_unpack("RGBA", "B;16L", 2, (0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0))
self.assert_unpack("RGBA", "A;16L", 2, (0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6))
if sys.byteorder == "little":
self.assert_unpack(
"RGBA", "R;16N", 2, (2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0)
)
self.assert_unpack(
"RGBA", "G;16N", 2, (0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0)
)
self.assert_unpack(
"RGBA", "B;16N", 2, (0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0)
)
self.assert_unpack(
"RGBA", "A;16N", 2, (0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6)
)
else:
self.assert_unpack(
"RGBA", "R;16N", 2, (1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0)
)
self.assert_unpack(
"RGBA", "G;16N", 2, (0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0)
)
self.assert_unpack(
"RGBA", "B;16N", 2, (0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0)
)
self.assert_unpack(
"RGBA", "A;16N", 2, (0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5)
)
def test_RGBa(self):
self.assert_unpack(
"RGBa", "RGBa", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)

151
src/libImaging/TiffDecode.c
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@ -181,7 +181,7 @@ int ImagingLibTiffInit(ImagingCodecState state, int fp, uint32 offset) {
}
int ReadTile(TIFF* tiff, UINT32 col, UINT32 row, UINT32* buffer) {
int ReadTile(TIFF* tiff, UINT32 col, UINT32 row, UINT8 plane, UINT32* buffer) {
uint16 photometric = 0;
TIFFGetField(tiff, TIFFTAG_PHOTOMETRIC, &photometric);
@ -228,7 +228,7 @@ int ReadTile(TIFF* tiff, UINT32 col, UINT32 row, UINT32* buffer) {
return 0;
}
if (TIFFReadTile(tiff, (tdata_t)buffer, col, row, 0, 0) == -1) {
if (TIFFReadTile(tiff, (tdata_t)buffer, col, row, 0, plane) == -1) {
TRACE(("Decode Error, Tile at %dx%d\n", col, row));
return -1;
}
@ -238,7 +238,7 @@ int ReadTile(TIFF* tiff, UINT32 col, UINT32 row, UINT32* buffer) {
return 0;
}
int ReadStrip(TIFF* tiff, UINT32 row, UINT32* buffer) {
int ReadStrip(TIFF* tiff, UINT32 row, UINT8 plane, UINT32* buffer) {
uint16 photometric = 0; // init to not PHOTOMETRIC_YCBCR
TIFFGetField(tiff, TIFFTAG_PHOTOMETRIC, &photometric);
@ -259,6 +259,8 @@ int ReadStrip(TIFF* tiff, UINT32 row, UINT32* buffer) {
if (TIFFRGBAImageOK(tiff, emsg) && TIFFRGBAImageBegin(&img, tiff, 0, emsg)) {
TRACE(("Initialized RGBAImage\n"));
// Using TIFFRGBAImageGet instead of TIFFReadRGBAStrip
// just to get strip in TOP_LEFT orientation
img.req_orientation = ORIENTATION_TOPLEFT;
img.row_offset = row;
img.col_offset = 0;
@ -281,7 +283,7 @@ int ReadStrip(TIFF* tiff, UINT32 row, UINT32* buffer) {
return 0;
}
if (TIFFReadEncodedStrip(tiff, TIFFComputeStrip(tiff, row, 0), (tdata_t)buffer, -1) == -1) {
if (TIFFReadEncodedStrip(tiff, TIFFComputeStrip(tiff, row, plane), (tdata_t)buffer, -1) == -1) {
TRACE(("Decode Error, strip %d\n", TIFFComputeStrip(tiff, row, 0)));
return -1;
}
@ -294,6 +296,10 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
char *filename = "tempfile.tif";
char *mode = "r";
TIFF *tiff;
uint16 photometric = 0; // init to not PHOTOMETRIC_YCBCR
UINT8 planarconfig;
UINT8 planes = 1;
ImagingShuffler unpackers[4];
/* buffer is the encoded file, bytes is the length of the encoded file */
/* it all ends up in state->buffer, which is a uint8* from Imaging.h */
@ -350,10 +356,40 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
rv = TIFFSetSubDirectory(tiff, ifdoffset);
if (!rv){
TRACE(("error in TIFFSetSubDirectory"));
state->errcode = IMAGING_CODEC_BROKEN;
TIFFClose(tiff);
return -1;
}
}
TIFFGetField(tiff, TIFFTAG_PHOTOMETRIC, &photometric);
TIFFGetFieldDefaulted(tiff, TIFFTAG_PLANARCONFIG, &planarconfig);
// YCbCr data is read as RGB by libtiff and we don't need to worry about planar storage in that case
// if number of bands is 1, there is no difference with contig case
if (planarconfig == PLANARCONFIG_SEPARATE && im->bands > 1 && photometric != PHOTOMETRIC_YCBCR) {
uint16 bps = 8;
TIFFGetFieldDefaulted(tiff, TIFFTAG_BITSPERSAMPLE, &bps);
if (bps != 8 && bps != 16) {
TRACE(("Invalid value for bits per sample: %d\n", bps));
state->errcode = IMAGING_CODEC_BROKEN;
TIFFClose(tiff);
return -1;
}
planes = im->bands;
// We'll pick appropriate set of unpackers depending on planar_configuration
// It does not matter if data is RGB(A), CMYK or LUV really,
// we just copy it plane by plane
unpackers[0] = ImagingFindUnpacker("RGBA", bps == 16 ? "R;16N" : "R", NULL);
unpackers[1] = ImagingFindUnpacker("RGBA", bps == 16 ? "G;16N" : "G", NULL);
unpackers[2] = ImagingFindUnpacker("RGBA", bps == 16 ? "B;16N" : "B", NULL);
unpackers[3] = ImagingFindUnpacker("RGBA", bps == 16 ? "A;16N" : "A", NULL);
} else {
unpackers[0] = state->shuffle;
}
if (TIFFIsTiled(tiff)) {
INT32 x, y, tile_y;
UINT32 tile_width, tile_length, current_tile_width, row_byte_size;
@ -370,7 +406,7 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
}
// We could use TIFFTileSize, but for YCbCr data it returns subsampled data size
row_byte_size = (tile_width * state->bits + 7) / 8;
row_byte_size = (tile_width * state->bits / planes + 7) / 8;
/* overflow check for realloc */
if (INT_MAX / row_byte_size < tile_length) {
@ -378,11 +414,11 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
TIFFClose(tiff);
return -1;
}
state->bytes = row_byte_size * tile_length;
if (TIFFTileSize(tiff) > state->bytes) {
// If the strip size as expected by LibTiff isn't what we're expecting, abort.
// If the tile size as expected by LibTiff isn't what we're expecting, abort.
state->errcode = IMAGING_CODEC_MEMORY;
TIFFClose(tiff);
return -1;
@ -402,29 +438,33 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
TRACE(("TIFFTileSize: %d\n", state->bytes));
for (y = state->yoff; y < state->ysize; y += tile_length) {
for (x = state->xoff; x < state->xsize; x += tile_width) {
if (ReadTile(tiff, x, y, (UINT32*) state->buffer) == -1) {
TRACE(("Decode Error, Tile at %dx%d\n", x, y));
state->errcode = IMAGING_CODEC_BROKEN;
TIFFClose(tiff);
return -1;
}
UINT8 plane;
for (plane = 0; plane < planes; plane++) {
ImagingShuffler shuffler = unpackers[plane];
for (x = state->xoff; x < state->xsize; x += tile_width) {
if (ReadTile(tiff, x, y, plane, (UINT32*) state->buffer) == -1) {
TRACE(("Decode Error, Tile at %dx%d\n", x, y));
state->errcode = IMAGING_CODEC_BROKEN;
TIFFClose(tiff);
return -1;
}
TRACE(("Read tile at %dx%d; \n\n", x, y));
TRACE(("Read tile at %dx%d; \n\n", x, y));
current_tile_width = min((INT32) tile_width, state->xsize - x);
current_tile_width = min((INT32) tile_width, state->xsize - x);
// iterate over each line in the tile and stuff data into image
for (tile_y = 0; tile_y < min((INT32) tile_length, state->ysize - y); tile_y++) {
TRACE(("Writing tile data at %dx%d using tile_width: %d; \n", tile_y + y, x, current_tile_width));
// iterate over each line in the tile and stuff data into image
for (tile_y = 0; tile_y < min((INT32) tile_length, state->ysize - y); tile_y++) {
TRACE(("Writing tile data at %dx%d using tile_width: %d; \n", tile_y + y, x, current_tile_width));
// UINT8 * bbb = state->buffer + tile_y * row_byte_size;
// TRACE(("chars: %x%x%x%x\n", ((UINT8 *)bbb)[0], ((UINT8 *)bbb)[1], ((UINT8 *)bbb)[2], ((UINT8 *)bbb)[3]));
// UINT8 * bbb = state->buffer + tile_y * row_byte_size;
// TRACE(("chars: %x%x%x%x\n", ((UINT8 *)bbb)[0], ((UINT8 *)bbb)[1], ((UINT8 *)bbb)[2], ((UINT8 *)bbb)[3]));
state->shuffle((UINT8*) im->image[tile_y + y] + x * im->pixelsize,
state->buffer + tile_y * row_byte_size,
current_tile_width
);
shuffler((UINT8*) im->image[tile_y + y] + x * im->pixelsize,
state->buffer + tile_y * row_byte_size,
current_tile_width
);
}
}
}
}
@ -441,7 +481,7 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
TRACE(("RowsPerStrip: %u \n", rows_per_strip));
// We could use TIFFStripSize, but for YCbCr data it returns subsampled data size
row_byte_size = (state->xsize * state->bits + 7) / 8;
row_byte_size = (state->xsize * state->bits / planes + 7) / 8;
/* overflow check for realloc */
if (INT_MAX / row_byte_size < rows_per_strip) {
@ -476,26 +516,55 @@ int ImagingLibTiffDecode(Imaging im, ImagingCodecState state, UINT8* buffer, Py_
state->buffer = new_data;
for (; state->y < state->ysize; state->y += rows_per_strip) {
if (ReadStrip(tiff, state->y, (UINT32 *)state->buffer) == -1) {
TRACE(("Decode Error, strip %d\n", TIFFComputeStrip(tiff, state->y, 0)));
state->errcode = IMAGING_CODEC_BROKEN;
TIFFClose(tiff);
return -1;
}
UINT8 plane;
for (plane = 0; plane < planes; plane++) {
ImagingShuffler shuffler = unpackers[plane];
if (ReadStrip(tiff, state->y, plane, (UINT32 *)state->buffer) == -1) {
TRACE(("Decode Error, strip %d\n", TIFFComputeStrip(tiff, state->y, 0)));
state->errcode = IMAGING_CODEC_BROKEN;
TIFFClose(tiff);
return -1;
}
TRACE(("Decoded strip for row %d \n", state->y));
TRACE(("Decoded strip for row %d \n", state->y));
// iterate over each row in the strip and stuff data into image
for (strip_row = 0; strip_row < min((INT32) rows_per_strip, state->ysize - state->y); strip_row++) {
// iterate over each row in the strip and stuff data into image
for (strip_row = 0; strip_row < min((INT32) rows_per_strip, state->ysize - state->y); strip_row++) {
TRACE(("Writing data into line %d ; \n", state->y + strip_row));
// UINT8 * bbb = state->buffer + strip_row * (state->bytes / rows_per_strip);
// TRACE(("chars: %x %x %x %x\n", ((UINT8 *)bbb)[0], ((UINT8 *)bbb)[1], ((UINT8 *)bbb)[2], ((UINT8 *)bbb)[3]));
// UINT8 * bbb = state->buffer + strip_row * (state->bytes / rows_per_strip);
// TRACE(("chars: %x %x %x %x\n", ((UINT8 *)bbb)[0], ((UINT8 *)bbb)[1], ((UINT8 *)bbb)[2], ((UINT8 *)bbb)[3]));
state->shuffle((UINT8*) im->image[state->y + state->yoff + strip_row] +
state->xoff * im->pixelsize,
state->buffer + strip_row * row_byte_size,
state->xsize);
shuffler((UINT8*) im->image[state->y + state->yoff + strip_row] +
state->xoff * im->pixelsize,
state->buffer + strip_row * row_byte_size,
state->xsize);
}
}
}
}
// Check if raw mode was RGBa and it was stored on separate planes
// so we have to convert it to RGBA
if (planes > 3 && strcmp(im->mode, "RGBA") == 0) {
uint16 extrasamples;
uint16* sampleinfo;
ImagingShuffler shuffle;
INT32 y;
TIFFGetFieldDefaulted(tiff, TIFFTAG_EXTRASAMPLES, &extrasamples, &sampleinfo);
if (extrasamples >= 1 &&
(sampleinfo[0] == EXTRASAMPLE_UNSPECIFIED || sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA)
) {
shuffle = ImagingFindUnpacker("RGBA", "RGBa", NULL);
for (y = state->yoff; y < state->ysize; y++) {
UINT8* ptr = (UINT8*) im->image[y + state->yoff] +
state->xoff * im->pixelsize;
shuffle(ptr, ptr, state->xsize);
}
}
}

124
src/libImaging/Unpack.c
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@ -1263,6 +1263,94 @@ band3I(UINT8* out, const UINT8* in, int pixels)
}
}
static void
band016B(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 0 only, big endian */
for (i = 0; i < pixels; i++) {
out[0] = in[0];
out += 4; in += 2;
}
}
static void
band116B(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 1 only, big endian */
for (i = 0; i < pixels; i++) {
out[1] = in[0];
out += 4; in += 2;
}
}
static void
band216B(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 2 only, big endian */
for (i = 0; i < pixels; i++) {
out[2] = in[0];
out += 4; in += 2;
}
}
static void
band316B(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 3 only, big endian */
for (i = 0; i < pixels; i++) {
out[3] = in[0];
out += 4; in += 2;
}
}
static void
band016L(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 0 only, little endian */
for (i = 0; i < pixels; i++) {
out[0] = in[1];
out += 4; in += 2;
}
}
static void
band116L(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 1 only, little endian */
for (i = 0; i < pixels; i++) {
out[1] = in[1];
out += 4; in += 2;
}
}
static void
band216L(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 2 only, little endian */
for (i = 0; i < pixels; i++) {
out[2] = in[1];
out += 4; in += 2;
}
}
static void
band316L(UINT8* out, const UINT8* in, int pixels)
{
int i;
/* band 3 only, little endian */
for (i = 0; i < pixels; i++) {
out[3] = in[1];
out += 4; in += 2;
}
}
static struct {
const char* mode;
const char* rawmode;
@ -1348,6 +1436,12 @@ static struct {
{"RGB", "R", 8, band0},
{"RGB", "G", 8, band1},
{"RGB", "B", 8, band2},
{"RGB", "R;16L", 16, band016L},
{"RGB", "G;16L", 16, band116L},
{"RGB", "B;16L", 16, band216L},
{"RGB", "R;16B", 16, band016B},
{"RGB", "G;16B", 16, band116B},
{"RGB", "B;16B", 16, band216B},
/* true colour w. alpha */
{"RGBA", "LA", 16, unpackRGBALA},
@ -1376,17 +1470,45 @@ static struct {
{"RGBA", "G", 8, band1},
{"RGBA", "B", 8, band2},
{"RGBA", "A", 8, band3},
{"RGBA", "R;16L", 16, band016L},
{"RGBA", "G;16L", 16, band116L},
{"RGBA", "B;16L", 16, band216L},
{"RGBA", "A;16L", 16, band316L},
{"RGBA", "R;16B", 16, band016B},
{"RGBA", "G;16B", 16, band116B},
{"RGBA", "B;16B", 16, band216B},
{"RGBA", "A;16B", 16, band316B},
#ifdef WORDS_BIGENDIAN
{"RGB", "RGB;16N", 48, unpackRGB16B},
{"RGBA", "RGBa;16N", 64, unpackRGBa16B},
{"RGBA", "RGBA;16N", 64, unpackRGBA16B},
{"RGBX", "RGBX;16N", 64, unpackRGBA16B},
{"RGB", "R;16N", 16, band016B},
{"RGB", "G;16N", 16, band116B},
{"RGB", "B;16N", 16, band216B},
{"RGBA", "R;16N", 16, band016B},
{"RGBA", "G;16N", 16, band116B},
{"RGBA", "B;16N", 16, band216B},
{"RGBA", "A;16N", 16, band316B},
#else
{"RGB", "RGB;16N", 48, unpackRGB16L},
{"RGBA", "RGBa;16N", 64, unpackRGBa16L},
{"RGBA", "RGBA;16N", 64, unpackRGBA16L},
{"RGBX", "RGBX;16N", 64, unpackRGBA16B},
{"RGBX", "RGBX;16N", 64, unpackRGBA16L},
{"RGB", "R;16N", 16, band016L},
{"RGB", "G;16N", 16, band116L},
{"RGB", "B;16N", 16, band216L},
{"RGBA", "R;16N", 16, band016L},
{"RGBA", "G;16N", 16, band116L},
{"RGBA", "B;16N", 16, band216L},
{"RGBA", "A;16N", 16, band316L},
#endif
/* true colour w. alpha premultiplied */