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Add support for BC7 to DdsImagePlugin

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This commit is contained in:
Robert Nix 2016-08-26 02:26:03 -05:00
parent b46804ea27
commit 2be760ca79
5 changed files with 54 additions and 11 deletions
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26
PIL/DdsImagePlugin.py
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@ -93,6 +93,13 @@ DXT3_FOURCC = 0x33545844
DXT5_FOURCC = 0x35545844
# dxgiformat.h
DXGI_FORMAT_BC7_TYPELESS = 97
DXGI_FORMAT_BC7_UNORM = 98
DXGI_FORMAT_BC7_UNORM_SRGB = 99
class DdsImageFile(ImageFile.ImageFile):
format = "DDS"
format_description = "DirectDraw Surface"
@ -119,6 +126,8 @@ class DdsImageFile(ImageFile.ImageFile):
bitcount, rmask, gmask, bmask, amask = struct.unpack("<5I",
header.read(20))
data_start = header_size + 4
n = 0
if fourcc == b"DXT1":
self.pixel_format = "DXT1"
n = 1
@ -128,12 +137,27 @@ class DdsImageFile(ImageFile.ImageFile):
elif fourcc == b"DXT5":
self.pixel_format = "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))
self.tile = [
("bcn", (0, 0) + self.size, 4 + header_size, (n))
("bcn", (0, 0) + self.size, data_start, (n))
]
def load_seek(self, pos):

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Tests/images/bc7-argb-8bpp_MipMaps-1.dds Normal file
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Tests/images/bc7-argb-8bpp_MipMaps-1.png Normal file
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15
Tests/test_file_dds.py
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@ -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):
@ -52,6 +53,20 @@ class TestFileDds(PillowTestCase):
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"""
# Arrange

24
libImaging/BcnDecode.c
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@ -327,10 +327,10 @@ static UINT8 expand_quantized(UINT8 v, int 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) >> 6);
dst->g = (UINT8)((t0 * e[0].g + s0 * e[1].g) >> 6);
dst->b = (UINT8)((t0 * e[0].b + s0 * e[1].b) >> 6);
dst->a = (UINT8)((t1 * e[0].a + s1 * e[1].a) >> 6);
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) {
@ -359,7 +359,7 @@ static void decode_bc7_block(rgba *col, const UINT8* src) {
cb = info->cb;
ab = info->ab;
cw = bc7_get_weights(info->ib);
aw = bc7_get_weights(ab ? info->ib2 : info->ib);
aw = bc7_get_weights((ab && info->ib2) ? info->ib2 : info->ib);
#define LOAD(DST, N) \
DST = get_bits(src, bit, N); \
@ -401,29 +401,33 @@ static void decode_bc7_block(rgba *col, const UINT8* src) {
#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);
cb++;
ASSIGN_P(endpoints[i].r);
ASSIGN_P(endpoints[i].g);
ASSIGN_P(endpoints[i].b);
if (ab) {
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);
cb++;
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) {
ab++;
ASSIGN_P(endpoints[i+j].a);
}
}
@ -462,7 +466,7 @@ static void decode_bc7_block(rgba *col, const UINT8* src) {
i0 = get_bits(src, cibit, ib);
cibit += ib;
if (ab) {
if (ab && info->ib2) {
ib2 = info->ib2;
if (ib2 && i == 0) {
ib2--;