mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-25 17:36:18 +03:00
Merge pull request #2068 from Mischanix/dxtc
Move DDS decoders to C, add DXT3, BC7 Decoders
This commit is contained in:
wiredfool
GitHub
commit
9c4c16df75
|
|
@ -93,118 +93,11 @@ DXT3_FOURCC = 0x33545844
|
|||
DXT5_FOURCC = 0x35545844
|
||||
|
||||
|
||||
def _decode565(bits):
|
||||
a = ((bits >> 11) & 0x1f) << 3
|
||||
b = ((bits >> 5) & 0x3f) << 2
|
||||
c = (bits & 0x1f) << 3
|
||||
return a, b, c
|
||||
# dxgiformat.h
|
||||
|
||||
|
||||
def _c2a(a, b):
|
||||
return (2 * a + b) // 3
|
||||
|
||||
|
||||
def _c2b(a, b):
|
||||
return (a + b) // 2
|
||||
|
||||
|
||||
def _c3(a, b):
|
||||
return (2 * b + a) // 3
|
||||
|
||||
|
||||
def _dxt1(data, width, height):
|
||||
# TODO implement this function as pixel format in decode.c
|
||||
ret = bytearray(4 * width * height)
|
||||
|
||||
for y in range(0, height, 4):
|
||||
for x in range(0, width, 4):
|
||||
color0, color1, bits = struct.unpack("<HHI", data.read(8))
|
||||
|
||||
r0, g0, b0 = _decode565(color0)
|
||||
r1, g1, b1 = _decode565(color1)
|
||||
|
||||
# Decode this block into 4x4 pixels
|
||||
for j in range(4):
|
||||
for i in range(4):
|
||||
# get next control op and generate a pixel
|
||||
control = bits & 3
|
||||
bits = bits >> 2
|
||||
if control == 0:
|
||||
r, g, b = r0, g0, b0
|
||||
elif control == 1:
|
||||
r, g, b = r1, g1, b1
|
||||
elif control == 2:
|
||||
if color0 > color1:
|
||||
r, g, b = _c2a(r0, r1), _c2a(g0, g1), _c2a(b0, b1)
|
||||
else:
|
||||
r, g, b = _c2b(r0, r1), _c2b(g0, g1), _c2b(b0, b1)
|
||||
elif control == 3:
|
||||
if color0 > color1:
|
||||
r, g, b = _c3(r0, r1), _c3(g0, g1), _c3(b0, b1)
|
||||
else:
|
||||
r, g, b = 0, 0, 0
|
||||
|
||||
idx = 4 * ((y + j) * width + (x + i))
|
||||
ret[idx:idx+4] = struct.pack('4B', r, g, b, 255)
|
||||
|
||||
return bytes(ret)
|
||||
|
||||
|
||||
def _dxtc_alpha(a0, a1, ac0, ac1, ai):
|
||||
if ai <= 12:
|
||||
ac = (ac0 >> ai) & 7
|
||||
elif ai == 15:
|
||||
ac = (ac0 >> 15) | ((ac1 << 1) & 6)
|
||||
else:
|
||||
ac = (ac1 >> (ai - 16)) & 7
|
||||
|
||||
if ac == 0:
|
||||
alpha = a0
|
||||
elif ac == 1:
|
||||
alpha = a1
|
||||
elif a0 > a1:
|
||||
alpha = ((8 - ac) * a0 + (ac - 1) * a1) // 7
|
||||
elif ac == 6:
|
||||
alpha = 0
|
||||
elif ac == 7:
|
||||
alpha = 0xff
|
||||
else:
|
||||
alpha = ((6 - ac) * a0 + (ac - 1) * a1) // 5
|
||||
|
||||
return alpha
|
||||
|
||||
|
||||
def _dxt5(data, width, height):
|
||||
# TODO implement this function as pixel format in decode.c
|
||||
ret = bytearray(4 * width * height)
|
||||
|
||||
for y in range(0, height, 4):
|
||||
for x in range(0, width, 4):
|
||||
a0, a1, ac0, ac1, c0, c1, code = struct.unpack("<2BHI2HI",
|
||||
data.read(16))
|
||||
|
||||
r0, g0, b0 = _decode565(c0)
|
||||
r1, g1, b1 = _decode565(c1)
|
||||
|
||||
for j in range(4):
|
||||
for i in range(4):
|
||||
ai = 3 * (4 * j + i)
|
||||
alpha = _dxtc_alpha(a0, a1, ac0, ac1, ai)
|
||||
|
||||
cc = (code >> 2 * (4 * j + i)) & 3
|
||||
if cc == 0:
|
||||
r, g, b = r0, g0, b0
|
||||
elif cc == 1:
|
||||
r, g, b = r1, g1, b1
|
||||
elif cc == 2:
|
||||
r, g, b = _c2a(r0, r1), _c2a(g0, g1), _c2a(b0, b1)
|
||||
elif cc == 3:
|
||||
r, g, b = _c3(r0, r1), _c3(g0, g1), _c3(b0, b1)
|
||||
|
||||
idx = 4 * ((y + j) * width + (x + i))
|
||||
ret[idx:idx+4] = struct.pack('4B', r, g, b, alpha)
|
||||
|
||||
return bytes(ret)
|
||||
DXGI_FORMAT_BC7_TYPELESS = 97
|
||||
DXGI_FORMAT_BC7_UNORM = 98
|
||||
DXGI_FORMAT_BC7_UNORM_SRGB = 99
|
||||
|
||||
|
||||
class DdsImageFile(ImageFile.ImageFile):
|
||||
|
|
@ -233,28 +126,39 @@ class DdsImageFile(ImageFile.ImageFile):
|
|||
bitcount, rmask, gmask, bmask, amask = struct.unpack("<5I",
|
||||
header.read(20))
|
||||
|
||||
self.tile = [
|
||||
("raw", (0, 0) + self.size, 0, (self.mode, 0, 1))
|
||||
]
|
||||
|
||||
data_start = header_size + 4
|
||||
n = 0
|
||||
if fourcc == b"DXT1":
|
||||
self.pixel_format = "DXT1"
|
||||
codec = _dxt1
|
||||
n = 1
|
||||
elif fourcc == b"DXT3":
|
||||
self.pixel_format = "DXT3"
|
||||
n = 2
|
||||
elif fourcc == b"DXT5":
|
||||
self.pixel_format = "DXT5"
|
||||
codec = _dxt5
|
||||
n = 3
|
||||
elif fourcc == b"DX10":
|
||||
data_start += 20
|
||||
# ignoring flags which pertain to volume textures and cubemaps
|
||||
dxt10 = BytesIO(self.fp.read(20))
|
||||
dxgi_format, dimension = struct.unpack("<II", dxt10.read(8))
|
||||
if dxgi_format in (DXGI_FORMAT_BC7_TYPELESS, DXGI_FORMAT_BC7_UNORM):
|
||||
self.pixel_format = "BC7"
|
||||
n = 7
|
||||
elif dxgi_format == DXGI_FORMAT_BC7_UNORM_SRGB:
|
||||
self.pixel_format = "BC7"
|
||||
self.im_info["gamma"] = 1/2.2
|
||||
n = 7
|
||||
else:
|
||||
raise NotImplementedError("Unimplemented DXGI format %d" %
|
||||
(dxgi_format))
|
||||
else:
|
||||
raise NotImplementedError("Unimplemented pixel format %r" %
|
||||
(fourcc))
|
||||
|
||||
try:
|
||||
decoded_data = codec(self.fp, self.width, self.height)
|
||||
except struct.error:
|
||||
raise IOError("Truncated DDS file")
|
||||
finally:
|
||||
self.fp.close()
|
||||
|
||||
self.fp = BytesIO(decoded_data)
|
||||
self.tile = [
|
||||
("bcn", (0, 0) + self.size, data_start, (n))
|
||||
]
|
||||
|
||||
def load_seek(self, pos):
|
||||
pass
|
||||
|
|
|
|||
|
|
@ -43,7 +43,6 @@ Note: All data is stored in little-Endian (Intel) byte order.
|
|||
import struct
|
||||
from io import BytesIO
|
||||
from PIL import Image, ImageFile
|
||||
from PIL.DdsImagePlugin import _dxt1
|
||||
|
||||
|
||||
MAGIC = b"FTEX"
|
||||
|
|
@ -73,8 +72,8 @@ class FtexImageFile(ImageFile.ImageFile):
|
|||
data = self.fp.read(mipmap_size)
|
||||
|
||||
if format == FORMAT_DXT1:
|
||||
data = _dxt1(BytesIO(data), self.width, self.height)
|
||||
self.tile = [("raw", (0, 0) + self.size, 0, ('RGBX', 0, 1))]
|
||||
self.mode = "RGBA"
|
||||
self.tile = [("bcn", (0, 0) + self.size, 0, (1))]
|
||||
elif format == FORMAT_UNCOMPRESSED:
|
||||
self.tile = [("raw", (0, 0) + self.size, 0, ('RGB', 0, 1))]
|
||||
else:
|
||||
|
|
|
|||
BIN
Tests/images/bc7-argb-8bpp_MipMaps-1.dds
Normal file
BIN
Tests/images/bc7-argb-8bpp_MipMaps-1.dds
Normal file
Binary file not shown.
BIN
Tests/images/bc7-argb-8bpp_MipMaps-1.png
Normal file
BIN
Tests/images/bc7-argb-8bpp_MipMaps-1.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 122 KiB |
Binary file not shown.
|
Before Width: | Height: | Size: 27 KiB After Width: | Height: | Size: 30 KiB |
Binary file not shown.
BIN
Tests/images/dxt3-argb-8bbp-explicitalpha_MipMaps-1.png
Normal file
BIN
Tests/images/dxt3-argb-8bbp-explicitalpha_MipMaps-1.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 36 KiB |
|
|
@ -6,6 +6,7 @@ from PIL import Image, DdsImagePlugin
|
|||
TEST_FILE_DXT1 = "Tests/images/dxt1-rgb-4bbp-noalpha_MipMaps-1.dds"
|
||||
TEST_FILE_DXT3 = "Tests/images/dxt3-argb-8bbp-explicitalpha_MipMaps-1.dds"
|
||||
TEST_FILE_DXT5 = "Tests/images/dxt5-argb-8bbp-interpolatedalpha_MipMaps-1.dds"
|
||||
TEST_FILE_DX10_BC7 = "Tests/images/bc7-argb-8bpp_MipMaps-1.dds"
|
||||
|
||||
|
||||
class TestFileDds(PillowTestCase):
|
||||
|
|
@ -22,7 +23,6 @@ class TestFileDds(PillowTestCase):
|
|||
self.assertEqual(im.mode, "RGBA")
|
||||
self.assertEqual(im.size, (256, 256))
|
||||
|
||||
# This target image is from the test set of images, and is exact.
|
||||
self.assert_image_equal(target.convert('RGBA'), im)
|
||||
|
||||
def test_sanity_dxt5(self):
|
||||
|
|
@ -37,18 +37,35 @@ class TestFileDds(PillowTestCase):
|
|||
self.assertEqual(im.mode, "RGBA")
|
||||
self.assertEqual(im.size, (256, 256))
|
||||
|
||||
# Imagemagick, which generated this target image from the .dds
|
||||
# has a slightly different decoder than is standard. It looks
|
||||
# a little brighter. The 0,0 pixel is (00,6c,f8,ff) by our code,
|
||||
# and by the target image for the DXT1, and the imagemagick .png
|
||||
# is giving (00, 6d, ff, ff). So, assert similar, pretty tight
|
||||
# I'm currently seeing about a 3 for the epsilon.
|
||||
self.assert_image_similar(target, im, 5)
|
||||
self.assert_image_equal(target, im)
|
||||
|
||||
def test_sanity_dxt3(self):
|
||||
"""Check DXT3 images are not supported"""
|
||||
self.assertRaises(NotImplementedError,
|
||||
lambda: Image.open(TEST_FILE_DXT3))
|
||||
"""Check DXT3 images can be opened"""
|
||||
|
||||
target = Image.open(TEST_FILE_DXT3.replace('.dds', '.png'))
|
||||
|
||||
im = Image.open(TEST_FILE_DXT3)
|
||||
im.load()
|
||||
|
||||
self.assertEqual(im.format, "DDS")
|
||||
self.assertEqual(im.mode, "RGBA")
|
||||
self.assertEqual(im.size, (256, 256))
|
||||
|
||||
self.assert_image_equal(target, im)
|
||||
|
||||
def test_dx10_bc7(self):
|
||||
"""Check DX10 images can be opened"""
|
||||
|
||||
target = Image.open(TEST_FILE_DX10_BC7.replace('.dds', '.png'))
|
||||
|
||||
im = Image.open(TEST_FILE_DX10_BC7)
|
||||
im.load()
|
||||
|
||||
self.assertEqual(im.format, "DDS")
|
||||
self.assertEqual(im.mode, "RGBA")
|
||||
self.assertEqual(im.size, (256, 256))
|
||||
|
||||
self.assert_image_equal(target, im)
|
||||
|
||||
def test__validate_true(self):
|
||||
"""Check valid prefix"""
|
||||
|
|
@ -89,7 +106,8 @@ class TestFileDds(PillowTestCase):
|
|||
img_file = f.read()
|
||||
|
||||
def short_file():
|
||||
Image.open(BytesIO(img_file[:-100]))
|
||||
im = Image.open(BytesIO(img_file[:-100]))
|
||||
im.load()
|
||||
|
||||
self.assertRaises(IOError, short_file)
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,4 @@
|
|||
from helper import PillowTestCase
|
||||
from helper import unittest, PillowTestCase
|
||||
from PIL import Image
|
||||
|
||||
|
||||
|
|
@ -13,4 +13,7 @@ class TestFileFtex(PillowTestCase):
|
|||
def test_load_dxt1(self):
|
||||
im = Image.open('Tests/images/ftex_dxt1.ftc')
|
||||
target = Image.open('Tests/images/ftex_dxt1.png')
|
||||
self.assert_image_similar(im, target, 15)
|
||||
self.assert_image_similar(im, target.convert('RGBA'), 15)
|
||||
|
||||
if __name__ == '__main__':
|
||||
unittest.main()
|
||||
|
|
|
|||
|
|
@ -3297,6 +3297,7 @@ static PyTypeObject PixelAccess_Type = {
|
|||
pluggable codecs, but not before PIL 1.2 */
|
||||
|
||||
/* Decoders (in decode.c) */
|
||||
extern PyObject* PyImaging_BcnDecoderNew(PyObject* self, PyObject* args);
|
||||
extern PyObject* PyImaging_BitDecoderNew(PyObject* self, PyObject* args);
|
||||
extern PyObject* PyImaging_FliDecoderNew(PyObject* self, PyObject* args);
|
||||
extern PyObject* PyImaging_GifDecoderNew(PyObject* self, PyObject* args);
|
||||
|
|
@ -3362,6 +3363,7 @@ static PyMethodDef functions[] = {
|
|||
{"copy", (PyCFunction)_copy2, 1},
|
||||
|
||||
/* Codecs */
|
||||
{"bcn_decoder", (PyCFunction)PyImaging_BcnDecoderNew, 1},
|
||||
{"bit_decoder", (PyCFunction)PyImaging_BitDecoderNew, 1},
|
||||
{"eps_encoder", (PyCFunction)PyImaging_EpsEncoderNew, 1},
|
||||
{"fli_decoder", (PyCFunction)PyImaging_FliDecoderNew, 1},
|
||||
|
|
|
|||
50
decode.c
50
decode.c
|
|
@ -367,6 +367,56 @@ PyImaging_BitDecoderNew(PyObject* self, PyObject* args)
|
|||
}
|
||||
|
||||
|
||||
/* -------------------------------------------------------------------- */
|
||||
/* BCn: GPU block-compressed texture formats */
|
||||
/* -------------------------------------------------------------------- */
|
||||
|
||||
PyObject*
|
||||
PyImaging_BcnDecoderNew(PyObject* self, PyObject* args)
|
||||
{
|
||||
ImagingDecoderObject* decoder;
|
||||
|
||||
char* mode;
|
||||
char* actual;
|
||||
int n = 0;
|
||||
int ystep = 1;
|
||||
if (!PyArg_ParseTuple(args, "s|ii", &mode, &n, &ystep))
|
||||
return NULL;
|
||||
|
||||
switch (n) {
|
||||
case 1: /* BC1: 565 color, 1-bit alpha */
|
||||
case 2: /* BC2: 565 color, 4-bit alpha */
|
||||
case 3: /* BC3: 565 color, 2-endpoint 8-bit interpolated alpha */
|
||||
case 5: /* BC5: 2-channel 8-bit via 2 BC3 alpha blocks */
|
||||
case 7: /* BC7: 4-channel 8-bit via everything */
|
||||
actual = "RGBA"; break;
|
||||
case 4: /* BC4: 1-channel 8-bit via 1 BC3 alpha block */
|
||||
actual = "L"; break;
|
||||
case 6: /* BC6: 3-channel 16-bit float */
|
||||
/* TODO: support 4-channel floating point images */
|
||||
actual = "RGBAF"; break;
|
||||
default:
|
||||
PyErr_SetString(PyExc_ValueError, "block compression type unknown");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (strcmp(mode, actual) != 0) {
|
||||
PyErr_SetString(PyExc_ValueError, "bad image mode");
|
||||
return NULL;
|
||||
}
|
||||
|
||||
decoder = PyImaging_DecoderNew(0);
|
||||
if (decoder == NULL)
|
||||
return NULL;
|
||||
|
||||
decoder->decode = ImagingBcnDecode;
|
||||
decoder->state.state = n;
|
||||
decoder->state.ystep = ystep;
|
||||
|
||||
return (PyObject*) decoder;
|
||||
}
|
||||
|
||||
|
||||
/* -------------------------------------------------------------------- */
|
||||
/* FLI */
|
||||
/* -------------------------------------------------------------------- */
|
||||
|
|
|
|||
855
libImaging/BcnDecode.c
Normal file
855
libImaging/BcnDecode.c
Normal file
|
|
@ -0,0 +1,855 @@
|
|||
/*
|
||||
* The Python Imaging Library
|
||||
*
|
||||
* decoder for DXTn-compressed data
|
||||
*
|
||||
* Format documentation:
|
||||
* http://oss.sgi.com/projects/ogl-sample/registry/EXT/texture_compression_s3tc.txt
|
||||
*
|
||||
* The contents of this file are in the public domain (CC0)
|
||||
* Full text of the CC0 license:
|
||||
* https://creativecommons.org/publicdomain/zero/1.0/
|
||||
*/
|
||||
|
||||
|
||||
#include "Imaging.h"
|
||||
|
||||
|
||||
typedef struct {
|
||||
UINT8 r, g, b, a;
|
||||
} rgba;
|
||||
|
||||
typedef struct {
|
||||
UINT8 l;
|
||||
} lum;
|
||||
|
||||
typedef struct {
|
||||
FLOAT32 r, g, b;
|
||||
} rgb32f;
|
||||
|
||||
typedef struct {
|
||||
UINT16 c0, c1;
|
||||
UINT32 lut;
|
||||
} bc1_color;
|
||||
|
||||
typedef struct {
|
||||
UINT8 a0, a1;
|
||||
UINT8 lut[6];
|
||||
} bc3_alpha;
|
||||
|
||||
#define LOAD16(p) \
|
||||
(p)[0] | ((p)[1] << 8)
|
||||
|
||||
#define LOAD32(p) \
|
||||
(p)[0] | ((p)[1] << 8) | ((p)[2] << 16) | ((p)[3] << 24)
|
||||
|
||||
static void bc1_color_load(bc1_color *dst, const UINT8 *src) {
|
||||
dst->c0 = LOAD16(src);
|
||||
dst->c1 = LOAD16(src + 2);
|
||||
dst->lut = LOAD32(src + 4);
|
||||
}
|
||||
|
||||
static void bc3_alpha_load(bc3_alpha *dst, const UINT8 *src) {
|
||||
memcpy(dst, src, sizeof(bc3_alpha));
|
||||
}
|
||||
|
||||
static rgba decode_565(UINT16 x) {
|
||||
rgba c;
|
||||
int r, g, b;
|
||||
r = (x & 0xf800) >> 8;
|
||||
r |= r >> 5;
|
||||
c.r = r;
|
||||
g = (x & 0x7e0) >> 3;
|
||||
g |= g >> 6;
|
||||
c.g = g;
|
||||
b = (x & 0x1f) << 3;
|
||||
b |= b >> 5;
|
||||
c.b = b;
|
||||
c.a = 0xff;
|
||||
return c;
|
||||
}
|
||||
|
||||
static void decode_bc1_color(rgba *dst, const UINT8 *src) {
|
||||
bc1_color col;
|
||||
rgba p[4];
|
||||
int n, cw;
|
||||
UINT16 r0, g0, b0, r1, g1, b1;
|
||||
bc1_color_load(&col, src);
|
||||
|
||||
p[0] = decode_565(col.c0);
|
||||
r0 = p[0].r;
|
||||
g0 = p[0].g;
|
||||
b0 = p[0].b;
|
||||
p[1] = decode_565(col.c1);
|
||||
r1 = p[1].r;
|
||||
g1 = p[1].g;
|
||||
b1 = p[1].b;
|
||||
if (col.c0 > col.c1) {
|
||||
p[2].r = (2*r0 + 1*r1) / 3;
|
||||
p[2].g = (2*g0 + 1*g1) / 3;
|
||||
p[2].b = (2*b0 + 1*b1) / 3;
|
||||
p[2].a = 0xff;
|
||||
p[3].r = (1*r0 + 2*r1) / 3;
|
||||
p[3].g = (1*g0 + 2*g1) / 3;
|
||||
p[3].b = (1*b0 + 2*b1) / 3;
|
||||
p[3].a = 0xff;
|
||||
} else {
|
||||
p[2].r = (r0 + r1) / 2;
|
||||
p[2].g = (g0 + g1) / 2;
|
||||
p[2].b = (b0 + b1) / 2;
|
||||
p[2].a = 0xff;
|
||||
p[3].r = 0;
|
||||
p[3].g = 0;
|
||||
p[3].b = 0;
|
||||
p[3].a = 0;
|
||||
}
|
||||
for (n = 0; n < 16; n++) {
|
||||
cw = 3 & (col.lut >> (2 * n));
|
||||
dst[n] = p[cw];
|
||||
}
|
||||
}
|
||||
|
||||
static void decode_bc3_alpha(char *dst, const UINT8 *src, int stride, int o) {
|
||||
bc3_alpha b;
|
||||
UINT16 a0, a1;
|
||||
UINT8 a[8];
|
||||
int n, lut, aw;
|
||||
bc3_alpha_load(&b, src);
|
||||
|
||||
a0 = b.a0;
|
||||
a1 = b.a1;
|
||||
a[0] = (UINT8)a0;
|
||||
a[1] = (UINT8)a1;
|
||||
if (a0 > a1) {
|
||||
a[2] = (6*a0 + 1*a1) / 7;
|
||||
a[3] = (5*a0 + 2*a1) / 7;
|
||||
a[4] = (4*a0 + 3*a1) / 7;
|
||||
a[5] = (3*a0 + 4*a1) / 7;
|
||||
a[6] = (2*a0 + 5*a1) / 7;
|
||||
a[7] = (1*a0 + 6*a1) / 7;
|
||||
} else {
|
||||
a[2] = (4*a0 + 1*a1) / 5;
|
||||
a[3] = (3*a0 + 2*a1) / 5;
|
||||
a[4] = (2*a0 + 3*a1) / 5;
|
||||
a[5] = (1*a0 + 4*a1) / 5;
|
||||
a[6] = 0;
|
||||
a[7] = 0xff;
|
||||
}
|
||||
lut = b.lut[0] | (b.lut[1] << 8) | (b.lut[2] << 16);
|
||||
for (n = 0; n < 8; n++) {
|
||||
aw = 7 & (lut >> (3 * n));
|
||||
dst[stride * n + o] = a[aw];
|
||||
}
|
||||
lut = b.lut[3] | (b.lut[4] << 8) | (b.lut[5] << 16);
|
||||
for (n = 0; n < 8; n++) {
|
||||
aw = 7 & (lut >> (3 * n));
|
||||
dst[stride * (8+n) + o] = a[aw];
|
||||
}
|
||||
}
|
||||
|
||||
static void decode_bc1_block(rgba *col, const UINT8* src) {
|
||||
decode_bc1_color(col, src);
|
||||
}
|
||||
|
||||
static void decode_bc2_block(rgba *col, const UINT8* src) {
|
||||
int n, bitI, byI, av;
|
||||
decode_bc1_color(col, src + 8);
|
||||
for (n = 0; n < 16; n++) {
|
||||
bitI = n * 4;
|
||||
byI = bitI >> 3;
|
||||
av = 0xf & (src[byI] >> (bitI & 7));
|
||||
av = (av << 4) | av;
|
||||
col[n].a = av;
|
||||
}
|
||||
}
|
||||
|
||||
static void decode_bc3_block(rgba *col, const UINT8* src) {
|
||||
decode_bc1_color(col, src + 8);
|
||||
decode_bc3_alpha((char *)col, src, sizeof(col[0]), 3);
|
||||
}
|
||||
|
||||
static void decode_bc4_block(lum *col, const UINT8* src) {
|
||||
decode_bc3_alpha((char *)col, src, sizeof(col[0]), 0);
|
||||
}
|
||||
|
||||
static void decode_bc5_block(rgba *col, const UINT8* src) {
|
||||
decode_bc3_alpha((char *)col, src, sizeof(col[0]), 0);
|
||||
decode_bc3_alpha((char *)col, src + 8, sizeof(col[0]), 1);
|
||||
}
|
||||
|
||||
/* BC6 and BC7 are described here:
|
||||
https://www.opengl.org/registry/specs/ARB/texture_compression_bptc.txt */
|
||||
|
||||
static UINT8 get_bit(const UINT8* src, int bit) {
|
||||
int by = bit >> 3;
|
||||
bit &= 7;
|
||||
return (src[by] >> bit) & 1;
|
||||
}
|
||||
|
||||
static UINT8 get_bits(const UINT8* src, int bit, int count) {
|
||||
UINT8 v;
|
||||
int x;
|
||||
int by = bit >> 3;
|
||||
bit &= 7;
|
||||
if (!count) {
|
||||
return 0;
|
||||
}
|
||||
if (bit + count <= 8) {
|
||||
v = (src[by] >> bit) & ((1 << count) - 1);
|
||||
} else {
|
||||
x = src[by] | (src[by+1] << 8);
|
||||
v = (x >> bit) & ((1 << count) - 1);
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
/* BC7 */
|
||||
typedef struct {
|
||||
char ns;
|
||||
char pb;
|
||||
char rb;
|
||||
char isb;
|
||||
char cb;
|
||||
char ab;
|
||||
char epb;
|
||||
char spb;
|
||||
char ib;
|
||||
char ib2;
|
||||
} bc7_mode_info;
|
||||
|
||||
static const bc7_mode_info bc7_modes[] = {
|
||||
{3, 4, 0, 0, 4, 0, 1, 0, 3, 0},
|
||||
{2, 6, 0, 0, 6, 0, 0, 1, 3, 0},
|
||||
{3, 6, 0, 0, 5, 0, 0, 0, 2, 0},
|
||||
{2, 6, 0, 0, 7, 0, 1, 0, 2, 0},
|
||||
{1, 0, 2, 1, 5, 6, 0, 0, 2, 3},
|
||||
{1, 0, 2, 0, 7, 8, 0, 0, 2, 2},
|
||||
{1, 0, 0, 0, 7, 7, 1, 0, 4, 0},
|
||||
{2, 6, 0, 0, 5, 5, 1, 0, 2, 0}
|
||||
};
|
||||
|
||||
/* Subset indices:
|
||||
Table.P2, 1 bit per index */
|
||||
static const UINT16 bc7_si2[] = {
|
||||
0xcccc, 0x8888, 0xeeee, 0xecc8, 0xc880, 0xfeec, 0xfec8, 0xec80,
|
||||
0xc800, 0xffec, 0xfe80, 0xe800, 0xffe8, 0xff00, 0xfff0, 0xf000,
|
||||
0xf710, 0x008e, 0x7100, 0x08ce, 0x008c, 0x7310, 0x3100, 0x8cce,
|
||||
0x088c, 0x3110, 0x6666, 0x366c, 0x17e8, 0x0ff0, 0x718e, 0x399c,
|
||||
0xaaaa, 0xf0f0, 0x5a5a, 0x33cc, 0x3c3c, 0x55aa, 0x9696, 0xa55a,
|
||||
0x73ce, 0x13c8, 0x324c, 0x3bdc, 0x6996, 0xc33c, 0x9966, 0x0660,
|
||||
0x0272, 0x04e4, 0x4e40, 0x2720, 0xc936, 0x936c, 0x39c6, 0x639c,
|
||||
0x9336, 0x9cc6, 0x817e, 0xe718, 0xccf0, 0x0fcc, 0x7744, 0xee22};
|
||||
|
||||
/* Table.P3, 2 bits per index */
|
||||
static const UINT32 bc7_si3[] = {
|
||||
0xaa685050, 0x6a5a5040, 0x5a5a4200, 0x5450a0a8,
|
||||
0xa5a50000, 0xa0a05050, 0x5555a0a0, 0x5a5a5050,
|
||||
0xaa550000, 0xaa555500, 0xaaaa5500, 0x90909090,
|
||||
0x94949494, 0xa4a4a4a4, 0xa9a59450, 0x2a0a4250,
|
||||
0xa5945040, 0x0a425054, 0xa5a5a500, 0x55a0a0a0,
|
||||
0xa8a85454, 0x6a6a4040, 0xa4a45000, 0x1a1a0500,
|
||||
0x0050a4a4, 0xaaa59090, 0x14696914, 0x69691400,
|
||||
0xa08585a0, 0xaa821414, 0x50a4a450, 0x6a5a0200,
|
||||
0xa9a58000, 0x5090a0a8, 0xa8a09050, 0x24242424,
|
||||
0x00aa5500, 0x24924924, 0x24499224, 0x50a50a50,
|
||||
0x500aa550, 0xaaaa4444, 0x66660000, 0xa5a0a5a0,
|
||||
0x50a050a0, 0x69286928, 0x44aaaa44, 0x66666600,
|
||||
0xaa444444, 0x54a854a8, 0x95809580, 0x96969600,
|
||||
0xa85454a8, 0x80959580, 0xaa141414, 0x96960000,
|
||||
0xaaaa1414, 0xa05050a0, 0xa0a5a5a0, 0x96000000,
|
||||
0x40804080, 0xa9a8a9a8, 0xaaaaaa44, 0x2a4a5254};
|
||||
|
||||
/* Anchor indices:
|
||||
Table.A2 */
|
||||
static const char bc7_ai0[] = {
|
||||
15,15,15,15,15,15,15,15,
|
||||
15,15,15,15,15,15,15,15,
|
||||
15, 2, 8, 2, 2, 8, 8,15,
|
||||
2, 8, 2, 2, 8, 8, 2, 2,
|
||||
15,15, 6, 8, 2, 8,15,15,
|
||||
2, 8, 2, 2, 2,15,15, 6,
|
||||
6, 2, 6, 8,15,15, 2, 2,
|
||||
15,15,15,15,15, 2, 2,15};
|
||||
|
||||
/* Table.A3a */
|
||||
static const char bc7_ai1[] = {
|
||||
3, 3,15,15, 8, 3,15,15,
|
||||
8, 8, 6, 6, 6, 5, 3, 3,
|
||||
3, 3, 8,15, 3, 3, 6,10,
|
||||
5, 8, 8, 6, 8, 5,15,15,
|
||||
8,15, 3, 5, 6,10, 8,15,
|
||||
15, 3,15, 5,15,15,15,15,
|
||||
3,15, 5, 5, 5, 8, 5,10,
|
||||
5,10, 8,13,15,12, 3, 3};
|
||||
|
||||
/* Table.A3b */
|
||||
static const char bc7_ai2[] = {
|
||||
15, 8, 8, 3,15,15, 3, 8,
|
||||
15,15,15,15,15,15,15, 8,
|
||||
15, 8,15, 3,15, 8,15, 8,
|
||||
3,15, 6,10,15,15,10, 8,
|
||||
15, 3,15,10,10, 8, 9,10,
|
||||
6,15, 8,15, 3, 6, 6, 8,
|
||||
15, 3,15,15,15,15,15,15,
|
||||
15,15,15,15, 3,15,15, 8};
|
||||
|
||||
/* Interpolation weights */
|
||||
static const char bc7_weights2[] = {0, 21, 43, 64};
|
||||
static const char bc7_weights3[] = {0, 9, 18, 27, 37, 46, 55, 64};
|
||||
static const char bc7_weights4[] = {
|
||||
0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64};
|
||||
|
||||
static const char *bc7_get_weights(int n) {
|
||||
if (n == 2) {
|
||||
return bc7_weights2;
|
||||
}
|
||||
if (n == 3) {
|
||||
return bc7_weights3;
|
||||
}
|
||||
return bc7_weights4;
|
||||
}
|
||||
|
||||
static int bc7_get_subset(int ns, int partition, int n) {
|
||||
if (ns == 2) {
|
||||
return 1 & (bc7_si2[partition] >> n);
|
||||
}
|
||||
if (ns == 3) {
|
||||
return 3 & (bc7_si3[partition] >> (2 * n));
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static UINT8 expand_quantized(UINT8 v, int bits) {
|
||||
v = v << (8 - bits);
|
||||
return v | (v >> bits);
|
||||
}
|
||||
|
||||
static void bc7_lerp(rgba *dst, const rgba *e, int s0, int s1) {
|
||||
int t0 = 64 - s0;
|
||||
int t1 = 64 - s1;
|
||||
dst->r = (UINT8)((t0 * e[0].r + s0 * e[1].r + 32) >> 6);
|
||||
dst->g = (UINT8)((t0 * e[0].g + s0 * e[1].g + 32) >> 6);
|
||||
dst->b = (UINT8)((t0 * e[0].b + s0 * e[1].b + 32) >> 6);
|
||||
dst->a = (UINT8)((t1 * e[0].a + s1 * e[1].a + 32) >> 6);
|
||||
}
|
||||
|
||||
static void decode_bc7_block(rgba *col, const UINT8* src) {
|
||||
rgba endpoints[6];
|
||||
int bit = 0, cibit, aibit;
|
||||
int mode = src[0];
|
||||
int i, j;
|
||||
int numep, cb, ab, ib, ib2, i0, i1, s;
|
||||
UINT8 index_sel, partition, rotation, val;
|
||||
const char *cw, *aw;
|
||||
const bc7_mode_info *info;
|
||||
|
||||
/* mode is the number of unset bits before the first set bit: */
|
||||
if (!mode) {
|
||||
/* degenerate case when no bits set */
|
||||
for (i = 0; i < 16; i++) {
|
||||
col[i].r = col[i].g = col[i].b = 0;
|
||||
col[i].a = 255;
|
||||
}
|
||||
return;
|
||||
}
|
||||
while (!(mode & (1 << bit++))) ;
|
||||
mode = bit - 1;
|
||||
info = &bc7_modes[mode];
|
||||
/* color selection bits: {subset}{endpoint} */
|
||||
cb = info->cb;
|
||||
ab = info->ab;
|
||||
cw = bc7_get_weights(info->ib);
|
||||
aw = bc7_get_weights((ab && info->ib2) ? info->ib2 : info->ib);
|
||||
|
||||
#define LOAD(DST, N) \
|
||||
DST = get_bits(src, bit, N); \
|
||||
bit += N;
|
||||
LOAD(partition, info->pb);
|
||||
LOAD(rotation, info->rb);
|
||||
LOAD(index_sel, info->isb);
|
||||
numep = info->ns << 1;
|
||||
|
||||
/* red */
|
||||
for (i = 0; i < numep; i++) {
|
||||
LOAD(val, cb);
|
||||
endpoints[i].r = val;
|
||||
}
|
||||
|
||||
/* green */
|
||||
for (i = 0; i < numep; i++) {
|
||||
LOAD(val, cb);
|
||||
endpoints[i].g = val;
|
||||
}
|
||||
|
||||
/* blue */
|
||||
for (i = 0; i < numep; i++) {
|
||||
LOAD(val, cb);
|
||||
endpoints[i].b = val;
|
||||
}
|
||||
|
||||
/* alpha */
|
||||
for (i = 0; i < numep; i++) {
|
||||
if (ab) {
|
||||
LOAD(val, ab);
|
||||
} else {
|
||||
val = 255;
|
||||
}
|
||||
endpoints[i].a = val;
|
||||
}
|
||||
|
||||
/* p-bits */
|
||||
#define ASSIGN_P(x) x = (x << 1) | val
|
||||
if (info->epb) {
|
||||
/* per endpoint */
|
||||
cb++;
|
||||
if (ab) {
|
||||
ab++;
|
||||
}
|
||||
for (i = 0; i < numep; i++) {
|
||||
LOAD(val, 1);
|
||||
ASSIGN_P(endpoints[i].r);
|
||||
ASSIGN_P(endpoints[i].g);
|
||||
ASSIGN_P(endpoints[i].b);
|
||||
if (ab) {
|
||||
ASSIGN_P(endpoints[i].a);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (info->spb) {
|
||||
/* per subset */
|
||||
cb++;
|
||||
if (ab) {
|
||||
ab++;
|
||||
}
|
||||
for (i = 0; i < numep; i+=2) {
|
||||
LOAD(val, 1);
|
||||
for (j = 0; j < 2; j++) {
|
||||
ASSIGN_P(endpoints[i+j].r);
|
||||
ASSIGN_P(endpoints[i+j].g);
|
||||
ASSIGN_P(endpoints[i+j].b);
|
||||
if (ab) {
|
||||
ASSIGN_P(endpoints[i+j].a);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
#undef ASSIGN_P
|
||||
#define EXPAND(x, b) x = expand_quantized(x, b)
|
||||
for (i = 0; i < numep; i++) {
|
||||
EXPAND(endpoints[i].r, cb);
|
||||
EXPAND(endpoints[i].g, cb);
|
||||
EXPAND(endpoints[i].b, cb);
|
||||
if (ab) {
|
||||
EXPAND(endpoints[i].a, ab);
|
||||
}
|
||||
}
|
||||
#undef EXPAND
|
||||
#undef LOAD
|
||||
cibit = bit;
|
||||
aibit = cibit + 16 * info->ib - info->ns;
|
||||
for (i = 0; i < 16; i++) {
|
||||
s = bc7_get_subset(info->ns, partition, i) << 1;
|
||||
ib = info->ib;
|
||||
if (i == 0) {
|
||||
ib--;
|
||||
} else if (info->ns == 2) {
|
||||
if (i == bc7_ai0[partition]) {
|
||||
ib--;
|
||||
}
|
||||
} else if (info->ns == 3) {
|
||||
if (i == bc7_ai1[partition]) {
|
||||
ib--;
|
||||
} else if (i == bc7_ai2[partition]) {
|
||||
ib--;
|
||||
}
|
||||
}
|
||||
i0 = get_bits(src, cibit, ib);
|
||||
cibit += ib;
|
||||
|
||||
if (ab && info->ib2) {
|
||||
ib2 = info->ib2;
|
||||
if (ib2 && i == 0) {
|
||||
ib2--;
|
||||
}
|
||||
i1 = get_bits(src, aibit, ib2);
|
||||
aibit += ib2;
|
||||
if (index_sel) {
|
||||
bc7_lerp(&col[i], &endpoints[s], aw[i1], cw[i0]);
|
||||
} else {
|
||||
bc7_lerp(&col[i], &endpoints[s], cw[i0], aw[i1]);
|
||||
}
|
||||
} else {
|
||||
bc7_lerp(&col[i], &endpoints[s], cw[i0], cw[i0]);
|
||||
}
|
||||
#define ROTATE(x, y) \
|
||||
val = x; \
|
||||
x = y; \
|
||||
y = val
|
||||
if (rotation == 1) {
|
||||
ROTATE(col[i].r, col[i].a);
|
||||
} else if (rotation == 2) {
|
||||
ROTATE(col[i].g, col[i].a);
|
||||
} else if (rotation == 3) {
|
||||
ROTATE(col[i].b, col[i].a);
|
||||
}
|
||||
#undef ROTATE
|
||||
}
|
||||
}
|
||||
|
||||
/* BC6 */
|
||||
typedef struct {
|
||||
char ns; /* number of subsets (also called regions) */
|
||||
char tr; /* whether endpoints are delta-compressed */
|
||||
char pb; /* partition bits */
|
||||
char epb; /* endpoint bits */
|
||||
char rb; /* red bits (delta) */
|
||||
char gb; /* green bits (delta) */
|
||||
char bb; /* blue bits (delta) */
|
||||
} bc6_mode_info;
|
||||
|
||||
static const bc6_mode_info bc6_modes[] = {
|
||||
// 00
|
||||
{2, 1, 5, 10, 5, 5, 5},
|
||||
// 01
|
||||
{2, 1, 5, 7, 6, 6, 6},
|
||||
// 10
|
||||
{2, 1, 5, 11, 5, 4, 4},
|
||||
{2, 1, 5, 11, 4, 5, 4},
|
||||
{2, 1, 5, 11, 4, 4, 5},
|
||||
{2, 1, 5, 9, 5, 5, 5},
|
||||
{2, 1, 5, 8, 6, 5, 5},
|
||||
{2, 1, 5, 8, 5, 6, 5},
|
||||
{2, 1, 5, 8, 5, 5, 6},
|
||||
{2, 0, 5, 6, 6, 6, 6},
|
||||
// 11
|
||||
{1, 0, 0, 10, 10, 10, 10},
|
||||
{1, 1, 0, 11, 9, 9, 9},
|
||||
{1, 1, 0, 12, 8, 8, 8},
|
||||
{1, 1, 0, 16, 4, 4, 4}
|
||||
};
|
||||
|
||||
/* Table.F, encoded as a sequence of bit indices */
|
||||
static const UINT8 bc6_bit_packings[][75] = {
|
||||
{116, 132, 176, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22,
|
||||
23, 24, 25, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 52,
|
||||
164, 112, 113, 114, 115, 64, 65, 66, 67, 68, 172, 160, 161, 162, 163, 80,
|
||||
81, 82, 83, 84, 173, 128, 129, 130, 131, 96, 97, 98, 99, 100, 174, 144,
|
||||
145, 146, 147, 148, 175},
|
||||
{117, 164, 165, 0, 1, 2, 3, 4, 5, 6, 172, 173, 132, 16, 17, 18, 19, 20, 21,
|
||||
22, 133, 174, 116, 32, 33, 34, 35, 36, 37, 38, 175, 177, 176, 48, 49, 50,
|
||||
51, 52, 53, 112, 113, 114, 115, 64, 65, 66, 67, 68, 69, 160, 161, 162, 163,
|
||||
80, 81, 82, 83, 84, 85, 128, 129, 130, 131, 96, 97, 98, 99, 100, 101, 144,
|
||||
145, 146, 147, 148, 149},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 52, 10, 112, 113, 114,
|
||||
115, 64, 65, 66, 67, 26, 172, 160, 161, 162, 163, 80, 81, 82, 83, 42, 173,
|
||||
128, 129, 130, 131, 96, 97, 98, 99, 100, 174, 144, 145, 146, 147, 148,
|
||||
175},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 10, 164, 112, 113, 114,
|
||||
115, 64, 65, 66, 67, 68, 26, 160, 161, 162, 163, 80, 81, 82, 83, 42, 173,
|
||||
128, 129, 130, 131, 96, 97, 98, 99, 172, 174, 144, 145, 146, 147, 116,
|
||||
175},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 10, 132, 112, 113, 114,
|
||||
115, 64, 65, 66, 67, 26, 172, 160, 161, 162, 163, 80, 81, 82, 83, 84, 42,
|
||||
128, 129, 130, 131, 96, 97, 98, 99, 173, 174, 144, 145, 146, 147, 176,
|
||||
175},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 132, 16, 17, 18, 19, 20, 21, 22, 23, 24, 116,
|
||||
32, 33, 34, 35, 36, 37, 38, 39, 40, 176, 48, 49, 50, 51, 52, 164, 112, 113,
|
||||
114, 115, 64, 65, 66, 67, 68, 172, 160, 161, 162, 163, 80, 81, 82, 83, 84,
|
||||
173, 128, 129, 130, 131, 96, 97, 98, 99, 100, 174, 144, 145, 146, 147, 148,
|
||||
175},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 164, 132, 16, 17, 18, 19, 20, 21, 22, 23, 174, 116,
|
||||
32, 33, 34, 35, 36, 37, 38, 39, 175, 176, 48, 49, 50, 51, 52, 53, 112, 113,
|
||||
114, 115, 64, 65, 66, 67, 68, 172, 160, 161, 162, 163, 80, 81, 82, 83, 84,
|
||||
173, 128, 129, 130, 131, 96, 97, 98, 99, 100, 101, 144, 145, 146, 147, 148,
|
||||
149},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 172, 132, 16, 17, 18, 19, 20, 21, 22, 23, 117, 116,
|
||||
32, 33, 34, 35, 36, 37, 38, 39, 165, 176, 48, 49, 50, 51, 52, 164, 112,
|
||||
113, 114, 115, 64, 65, 66, 67, 68, 69, 160, 161, 162, 163, 80, 81, 82, 83,
|
||||
84, 173, 128, 129, 130, 131, 96, 97, 98, 99, 100, 174, 144, 145, 146, 147,
|
||||
148, 175},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 173, 132, 16, 17, 18, 19, 20, 21, 22, 23, 133, 116,
|
||||
32, 33, 34, 35, 36, 37, 38, 39, 177, 176, 48, 49, 50, 51, 52, 164, 112,
|
||||
113, 114, 115, 64, 65, 66, 67, 68, 172, 160, 161, 162, 163, 80, 81, 82, 83,
|
||||
84, 85, 128, 129, 130, 131, 96, 97, 98, 99, 100, 174, 144, 145, 146, 147,
|
||||
148, 175},
|
||||
{0, 1, 2, 3, 4, 5, 164, 172, 173, 132, 16, 17, 18, 19, 20, 21, 117, 133,
|
||||
174, 116, 32, 33, 34, 35, 36, 37, 165, 175, 177, 176, 48, 49, 50, 51, 52,
|
||||
53, 112, 113, 114, 115, 64, 65, 66, 67, 68, 69, 160, 161, 162, 163, 80, 81,
|
||||
82, 83, 84, 85, 128, 129, 130, 131, 96, 97, 98, 99, 100, 101, 144, 145,
|
||||
146, 147, 148, 149},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
|
||||
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 80, 81, 82, 83, 84, 85, 86, 87, 88,
|
||||
89},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 52, 53, 54, 55, 56, 10,
|
||||
64, 65, 66, 67, 68, 69, 70, 71, 72, 26, 80, 81, 82, 83, 84, 85, 86, 87, 88,
|
||||
42},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 52, 53, 54, 55, 11, 10,
|
||||
64, 65, 66, 67, 68, 69, 70, 71, 27, 26, 80, 81, 82, 83, 84, 85, 86, 87, 43,
|
||||
42},
|
||||
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 32,
|
||||
33, 34, 35, 36, 37, 38, 39, 40, 41, 48, 49, 50, 51, 15, 14, 13, 12, 11, 10,
|
||||
64, 65, 66, 67, 31, 30, 29, 28, 27, 26, 80, 81, 82, 83, 47, 46, 45, 44, 43,
|
||||
42}};
|
||||
|
||||
static void bc6_sign_extend(UINT16 *v, int prec) {
|
||||
int x = *v;
|
||||
if (x & (1 << (prec - 1))) {
|
||||
x |= -1 << prec;
|
||||
}
|
||||
*v = (UINT16)x;
|
||||
}
|
||||
|
||||
static int bc6_unquantize(UINT16 v, int prec, int sign) {
|
||||
int s = 0;
|
||||
int x;
|
||||
if (!sign) {
|
||||
x = v;
|
||||
if (prec >= 15) return x;
|
||||
if (x == 0) return 0;
|
||||
if (x == ((1 << prec) - 1)) {
|
||||
return 0xffff;
|
||||
}
|
||||
return ((x << 15) + 0x4000) >> (prec - 1);
|
||||
} else {
|
||||
x = (INT16)v;
|
||||
if (prec >= 16) return x;
|
||||
if (x < 0) {
|
||||
s = 1;
|
||||
x = -x;
|
||||
}
|
||||
|
||||
if (x != 0) {
|
||||
if (x >= ((1 << (prec - 1)) - 1)) {
|
||||
x = 0x7fff;
|
||||
} else {
|
||||
x = ((x << 15) + 0x4000) >> (prec - 1);
|
||||
}
|
||||
}
|
||||
|
||||
if (s) {
|
||||
return -x;
|
||||
}
|
||||
return x;
|
||||
}
|
||||
}
|
||||
|
||||
static float half_to_float(UINT16 h) {
|
||||
/* https://gist.github.com/rygorous/2144712 */
|
||||
union {
|
||||
UINT32 u;
|
||||
float f;
|
||||
} o, m;
|
||||
m.u = 0x77800000;
|
||||
o.u = (h & 0x7fff) << 13;
|
||||
o.f *= m.f;
|
||||
m.u = 0x47800000;
|
||||
if (o.f >= m.f) {
|
||||
o.u |= 255 << 23;
|
||||
}
|
||||
o.u |= (h & 0x8000) << 16;
|
||||
return o.f;
|
||||
}
|
||||
|
||||
static float bc6_finalize(int v, int sign) {
|
||||
if (sign) {
|
||||
if (v < 0) {
|
||||
v = ((-v) * 31) / 32;
|
||||
return half_to_float((UINT16)(0x8000 | v));
|
||||
} else {
|
||||
return half_to_float((UINT16)((v * 31) / 32));
|
||||
}
|
||||
} else {
|
||||
return half_to_float((UINT16)((v * 31) / 64));
|
||||
}
|
||||
}
|
||||
|
||||
static void bc6_lerp(rgb32f *col, int *e0, int *e1, int s, int sign) {
|
||||
int r, g, b;
|
||||
int t = 64 - s;
|
||||
r = (e0[0] * t + e1[0] * s) >> 6;
|
||||
g = (e0[1] * t + e1[1] * s) >> 6;
|
||||
b = (e0[2] * t + e1[2] * s) >> 6;
|
||||
col->r = bc6_finalize(r, sign);
|
||||
col->g = bc6_finalize(g, sign);
|
||||
col->b = bc6_finalize(b, sign);
|
||||
}
|
||||
|
||||
static void decode_bc6_block(rgb32f *col, const UINT8* src, int sign) {
|
||||
UINT16 endpoints[12]; /* storage for r0, g0, b0, r1, ... */
|
||||
int ueps[12];
|
||||
int i, i0, ib2, di, dw, mask, numep, s;
|
||||
UINT8 partition;
|
||||
const bc6_mode_info *info;
|
||||
const char *cw;
|
||||
int bit = 5;
|
||||
int epbits = 75;
|
||||
int ib = 3;
|
||||
int mode = src[0] & 0x1f;
|
||||
if ((mode & 3) == 0 || (mode & 3) == 1) {
|
||||
mode &= 3;
|
||||
bit = 2;
|
||||
} else if ((mode & 3) == 2) {
|
||||
mode = 2 + (mode >> 2);
|
||||
epbits = 72;
|
||||
} else {
|
||||
mode = 10 + (mode >> 2);
|
||||
epbits = 60;
|
||||
ib = 4;
|
||||
}
|
||||
if (mode >= 14) {
|
||||
/* invalid block */
|
||||
memset(col, 0, 16 * sizeof(col[0]));
|
||||
return;
|
||||
}
|
||||
info = &bc6_modes[mode];
|
||||
cw = bc7_get_weights(ib);
|
||||
numep = info->ns == 2 ? 12 : 6;
|
||||
for (i = 0; i < 12; i++) {
|
||||
endpoints[i] = 0;
|
||||
}
|
||||
for (i = 0; i < epbits; i++) {
|
||||
di = bc6_bit_packings[mode][i];
|
||||
dw = di >> 4;
|
||||
di &= 15;
|
||||
endpoints[dw] |= (UINT16)get_bit(src, bit + i) << di;
|
||||
}
|
||||
bit += epbits;
|
||||
partition = get_bits(src, bit, info->pb);
|
||||
bit += info->pb;
|
||||
mask = (1 << info->epb) - 1;
|
||||
if (sign) { /* sign-extend e0 if signed */
|
||||
bc6_sign_extend(&endpoints[0], info->epb);
|
||||
bc6_sign_extend(&endpoints[1], info->epb);
|
||||
bc6_sign_extend(&endpoints[2], info->epb);
|
||||
}
|
||||
if (sign || info->tr) { /* sign-extend e1,2,3 if signed or deltas */
|
||||
for (i = 3; i < numep; i += 3) {
|
||||
bc6_sign_extend(&endpoints[i+0], info->rb);
|
||||
bc6_sign_extend(&endpoints[i+1], info->gb);
|
||||
bc6_sign_extend(&endpoints[i+2], info->bb);
|
||||
}
|
||||
}
|
||||
if (info->tr) { /* apply deltas */
|
||||
for (i = 3; i < numep; i++) {
|
||||
endpoints[i] = (endpoints[i] + endpoints[0]) & mask;
|
||||
}
|
||||
if (sign) {
|
||||
for (i = 3; i < numep; i += 3) {
|
||||
bc6_sign_extend(&endpoints[i+0], info->rb);
|
||||
bc6_sign_extend(&endpoints[i+1], info->gb);
|
||||
bc6_sign_extend(&endpoints[i+2], info->bb);
|
||||
}
|
||||
}
|
||||
}
|
||||
for (i = 0; i < numep; i++) {
|
||||
ueps[i] = bc6_unquantize(endpoints[i], info->epb, sign);
|
||||
}
|
||||
for (i = 0; i < 16; i++) {
|
||||
s = bc7_get_subset(info->ns, partition, i) * 6;
|
||||
ib2 = ib;
|
||||
if (i == 0) {
|
||||
ib2--;
|
||||
} else if (info->ns == 2) {
|
||||
if (i == bc7_ai0[partition]) {
|
||||
ib2--;
|
||||
}
|
||||
}
|
||||
i0 = get_bits(src, bit, ib2);
|
||||
bit += ib2;
|
||||
|
||||
bc6_lerp(&col[i], &ueps[s], &ueps[s+3], cw[i0], sign);
|
||||
}
|
||||
}
|
||||
|
||||
static void put_block(Imaging im, ImagingCodecState state, const char *col, int sz, int C) {
|
||||
int width = state->xsize;
|
||||
int height = state->ysize;
|
||||
int xmax = width + state->xoff;
|
||||
int ymax = height + state->yoff;
|
||||
int j, i, y, x;
|
||||
char *dst;
|
||||
for (j = 0; j < 4; j++) {
|
||||
y = state->y + j;
|
||||
if (C) {
|
||||
if (y >= height) {
|
||||
continue;
|
||||
}
|
||||
if (state->ystep < 0) {
|
||||
y = state->yoff + ymax - y - 1;
|
||||
}
|
||||
dst = im->image[y];
|
||||
for (i = 0; i < 4; i++) {
|
||||
x = state->x + i;
|
||||
if (x >= width) {
|
||||
continue;
|
||||
}
|
||||
memcpy(dst + sz*x, col + sz*(j*4 + i), sz);
|
||||
}
|
||||
} else {
|
||||
if (state->ystep < 0) {
|
||||
y = state->yoff + ymax - y - 1;
|
||||
}
|
||||
x = state->x;
|
||||
dst = im->image[y] + sz*x;
|
||||
memcpy(dst, col + sz*(j*4), 4 * sz);
|
||||
}
|
||||
}
|
||||
state->x += 4;
|
||||
if (state->x >= xmax) {
|
||||
state->y += 4;
|
||||
state->x = state->xoff;
|
||||
}
|
||||
}
|
||||
|
||||
static int decode_bcn(Imaging im, ImagingCodecState state, const UINT8* src, int bytes, int N, int C) {
|
||||
int ymax = state->ysize + state->yoff;
|
||||
const UINT8 *ptr = src;
|
||||
switch (N) {
|
||||
#define DECODE_LOOP(NN, SZ, TY, ...) \
|
||||
case NN: \
|
||||
while (bytes >= SZ) { \
|
||||
TY col[16]; \
|
||||
decode_bc##NN##_block(col, ptr); \
|
||||
put_block(im, state, (const char *)col, sizeof(col[0]), C); \
|
||||
ptr += SZ; \
|
||||
bytes -= SZ; \
|
||||
if (state->y >= ymax) return -1; \
|
||||
} \
|
||||
break
|
||||
DECODE_LOOP(1, 8, rgba);
|
||||
DECODE_LOOP(2, 16, rgba);
|
||||
DECODE_LOOP(3, 16, rgba);
|
||||
DECODE_LOOP(4, 8, lum);
|
||||
DECODE_LOOP(5, 16, rgba);
|
||||
case 6:
|
||||
while (bytes >= 16) {
|
||||
rgb32f col[16];
|
||||
decode_bc6_block(col, ptr, (state->state >> 4) & 1);
|
||||
put_block(im, state, (const char *)col, sizeof(col[0]), C);
|
||||
ptr += 16;
|
||||
bytes -= 16;
|
||||
if (state->y >= ymax) return -1; \
|
||||
}
|
||||
break;
|
||||
DECODE_LOOP(7, 16, rgba);
|
||||
#undef DECODE_LOOP
|
||||
}
|
||||
return (int)(ptr - src);
|
||||
}
|
||||
|
||||
int ImagingBcnDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes) {
|
||||
int N = state->state & 0xf;
|
||||
int width = state->xsize;
|
||||
int height = state->ysize;
|
||||
if ((width & 3) | (height & 3)) {
|
||||
return decode_bcn(im, state, buf, bytes, N, 1);
|
||||
} else {
|
||||
return decode_bcn(im, state, buf, bytes, N, 0);
|
||||
}
|
||||
}
|
||||
|
|
@ -388,6 +388,8 @@ typedef struct ImagingCodecStateInstance *ImagingCodecState;
|
|||
typedef int (*ImagingCodec)(Imaging im, ImagingCodecState state,
|
||||
UINT8* buffer, int bytes);
|
||||
|
||||
extern int ImagingBcnDecode(Imaging im, ImagingCodecState state,
|
||||
UINT8* buffer, int bytes);
|
||||
extern int ImagingBitDecode(Imaging im, ImagingCodecState state,
|
||||
UINT8* buffer, int bytes);
|
||||
extern int ImagingEpsEncode(Imaging im, ImagingCodecState state,
|
||||
|
|
|
|||
22
setup.py
22
setup.py
|
|
@ -26,17 +26,17 @@ import mp_compile
|
|||
_IMAGING = ("decode", "encode", "map", "display", "outline", "path")
|
||||
|
||||
_LIB_IMAGING = (
|
||||
"Access", "AlphaComposite", "Resample", "Bands", "BitDecode", "Blend",
|
||||
"Chops", "Convert", "ConvertYCbCr", "Copy", "Crc32", "Crop", "Dib", "Draw",
|
||||
"Effects", "EpsEncode", "File", "Fill", "Filter", "FliDecode", "Geometry",
|
||||
"GetBBox", "GifDecode", "GifEncode", "HexDecode", "Histo", "JpegDecode",
|
||||
"JpegEncode", "LzwDecode", "Matrix", "ModeFilter", "MspDecode", "Negative",
|
||||
"Offset", "Pack", "PackDecode", "Palette", "Paste", "Quant", "QuantOctree",
|
||||
"QuantHash", "QuantHeap", "PcdDecode", "PcxDecode", "PcxEncode", "Point",
|
||||
"RankFilter", "RawDecode", "RawEncode", "Storage", "SunRleDecode",
|
||||
"TgaRleDecode", "Unpack", "UnpackYCC", "UnsharpMask", "XbmDecode",
|
||||
"XbmEncode", "ZipDecode", "ZipEncode", "TiffDecode", "Jpeg2KDecode",
|
||||
"Jpeg2KEncode", "BoxBlur", "QuantPngQuant", "codec_fd")
|
||||
"Access", "AlphaComposite", "Resample", "Bands", "BcnDecode", "BitDecode",
|
||||
"Blend", "Chops", "Convert", "ConvertYCbCr", "Copy", "Crc32", "Crop", "Dib",
|
||||
"Draw", "Effects", "EpsEncode", "File", "Fill", "Filter", "FliDecode",
|
||||
"Geometry", "GetBBox", "GifDecode", "GifEncode", "HexDecode", "Histo",
|
||||
"JpegDecode", "JpegEncode", "LzwDecode", "Matrix", "ModeFilter",
|
||||
"MspDecode", "Negative", "Offset", "Pack", "PackDecode", "Palette", "Paste",
|
||||
"Quant", "QuantOctree", "QuantHash", "QuantHeap", "PcdDecode", "PcxDecode",
|
||||
"PcxEncode", "Point", "RankFilter", "RawDecode", "RawEncode", "Storage",
|
||||
"SunRleDecode", "TgaRleDecode", "Unpack", "UnpackYCC", "UnsharpMask",
|
||||
"XbmDecode", "XbmEncode", "ZipDecode", "ZipEncode", "TiffDecode",
|
||||
"Jpeg2KDecode", "Jpeg2KEncode", "BoxBlur", "QuantPngQuant", "codec_fd")
|
||||
|
||||
DEBUG = False
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user