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Merge pull request #6167 from gmarkall/unpack-bgra16

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Add support for unpacking 16-bit BGRA
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Andrew Murray 2022-04-04 07:49:45 +10:00 committed by GitHub
commit ba5f2d75b5
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2 changed files with 30 additions and 2 deletions
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2
Tests/test_lib_pack.py
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@ -444,6 +444,8 @@ class TestLibUnpack:
self.assert_unpack("RGBA", "RGBA;4B", 2, (17, 0, 34, 0), (51, 0, 68, 0))
self.assert_unpack("RGBA", "RGBA;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))
self.assert_unpack("RGBA", "RGBA;16B", 8, (1, 3, 5, 7), (9, 11, 13, 15))
self.assert_unpack("RGBA", "BGRA;16L", 8, (6, 4, 2, 8), (14, 12, 10, 16))
self.assert_unpack("RGBA", "BGRA;16B", 8, (5, 3, 1, 7), (13, 11, 9, 15))
self.assert_unpack(
"RGBA", "BGRA", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)
)

30
src/libImaging/Unpack.c
View File

@ -705,7 +705,7 @@ ImagingUnpackBGR15(UINT8 *out, const UINT8 *in, int pixels) {
void
ImagingUnpackBGRA15(UINT8 *out, const UINT8 *in, int pixels) {
int i, pixel;
/* RGB, reversed bytes, 5/5/5/1 bits per pixel */
/* RGB, rearranged channels, 5/5/5/1 bits per pixel */
for (i = 0; i < pixels; i++) {
pixel = in[0] + (in[1] << 8);
out[B] = (pixel & 31) * 255 / 31;
@ -1056,7 +1056,7 @@ unpackABGR(UINT8 *_out, const UINT8 *in, int pixels) {
static void
unpackBGRA(UINT8 *_out, const UINT8 *in, int pixels) {
int i;
/* RGBA, reversed bytes */
/* RGBA, rearranged channels */
for (i = 0; i < pixels; i++) {
UINT32 iv = MAKE_UINT32(in[2], in[1], in[0], in[3]);
memcpy(_out, &iv, sizeof(iv));
@ -1065,6 +1065,30 @@ unpackBGRA(UINT8 *_out, const UINT8 *in, int pixels) {
}
}
static void
unpackBGRA16L(UINT8 *_out, const UINT8 *in, int pixels) {
int i;
/* 16-bit RGBA, little-endian order, rearranged channels */
for (i = 0; i < pixels; i++) {
UINT32 iv = MAKE_UINT32(in[5], in[3], in[1], in[7]);
memcpy(_out, &iv, sizeof(iv));
in += 8;
_out += 4;
}
}
static void
unpackBGRA16B(UINT8 *_out, const UINT8 *in, int pixels) {
int i;
/* 16-bit RGBA, big-endian order, rearranged channels */
for (i = 0; i < pixels; i++) {
UINT32 iv = MAKE_UINT32(in[4], in[2], in[0], in[6]);
memcpy(_out, &iv, sizeof(iv));
in += 8;
_out += 4;
}
}
/* Unpack to "CMYK" image */
static void
@ -1574,6 +1598,8 @@ static struct {
{"RGBA", "RGBA;16L", 64, unpackRGBA16L},
{"RGBA", "RGBA;16B", 64, unpackRGBA16B},
{"RGBA", "BGRA", 32, unpackBGRA},
{"RGBA", "BGRA;16L", 64, unpackBGRA16L},
{"RGBA", "BGRA;16B", 64, unpackBGRA16B},
{"RGBA", "ARGB", 32, unpackARGB},
{"RGBA", "ABGR", 32, unpackABGR},
{"RGBA", "YCCA;P", 32, ImagingUnpackYCCA},