From c3457f10eb6b56fcd3f9b795a79cd8df672dd5c6 Mon Sep 17 00:00:00 2001
From: REDxEYE <med45c@gmail.com>
Date: Sun, 14 Aug 2022 21:11:18 +0300
Subject: [PATCH] Add switch to DXT1 encoder to select block mode (With
 alpha/Without alpha)

---
 Tests/images/vtf_a8.png       | Bin 3223 -> 4221 bytes
 Tests/images/vtf_a8.vtf       | Bin 87605 -> 87605 bytes
 Tests/images/vtf_bgr888.vtf   | Bin 262367 -> 262367 bytes
 Tests/images/vtf_dxt1.vtf     | Bin 43928 -> 43928 bytes
 Tests/images/vtf_dxt1A.vtf    | Bin 43928 -> 43928 bytes
 Tests/images/vtf_i8.vtf       | Bin 87605 -> 87605 bytes
 Tests/images/vtf_ia88.vtf     | Bin 174986 -> 174986 bytes
 Tests/images/vtf_rgb888.vtf   | Bin 262367 -> 262367 bytes
 Tests/images/vtf_rgba8888.vtf | Bin 349748 -> 349748 bytes
 Tests/images/vtf_uv88.vtf     | Bin 174986 -> 174986 bytes
 Tests/test_file_vtf.py        |  38 ++++++++++--
 src/PIL/VtfImagePlugin.py     | 113 ++++++++++++----------------------
 src/libImaging/BcnEncode.c    |  36 ++++++-----
 13 files changed, 94 insertions(+), 93 deletions(-)

diff --git a/Tests/images/vtf_a8.png b/Tests/images/vtf_a8.png
index 2411de7e2230a795d73301b89c2aa8d458b5ab60..1e95446f151993e688cd7f2605e3e70f018e5387 100644
GIT binary patch
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diff --git a/Tests/images/vtf_a8.vtf b/Tests/images/vtf_a8.vtf
index e2bf3501fe1c9538a25ec75a6ae66ae3d5247da4..4705e9e0915feed5579abf026f04048da5f1bdc8 100644
GIT binary patch
delta 100
zcmdnGhIQ*2)(I^kwziDS0y7vG`1njk6Brm692}VAffNL2FfbfG%q+}ck-%VY?+}mx
p6b%oD$^j{JE(V76>seVRurn}(hAJ?C<QW+md>U_Ty}=k83IN3h63hSq

delta 100
zcmdnGhIQ*2)(I^kqN0q90y7vG*w{ox6Brm692^)!ffNL2FfceeG72(SBrs@cIXEN$
lMMDv?4CY)6469bLvQA(Ji7POG<QW+mTpDj|y}=k83II#o5as{?

diff --git a/Tests/images/vtf_bgr888.vtf b/Tests/images/vtf_bgr888.vtf
index 2b7640ef4e561a8526bc444eef21712f52cadac5..081220d8056764c0443c10c4d8f2c6f13563be66 100644
GIT binary patch
delta 108
zcmccLC~&_~U_wiXtt}(7zzhZkK0Z^?1O^5M2M6YOAO!&$3=D@4GYd0VBrw?9I|L*E
xMZ?3PazM(Qi-BSNdREp6><kQ{p$ZHjc}7MCpT--lHyB%QFty%bo_d3Y9RPJ{7Bv6>

delta 108
zcmccLC~&_~U_wiXs3;?&zzhZkHa1bw1O^5M2M5MbAO!&$3=EErjDidn2@G0V4h{)G
t(NKgegE<!i!>U!RtP|Kl;tC8Pc}7MCm&O~dHyB%QFty%bo_d3Y9RTeB6i)yE

diff --git a/Tests/images/vtf_dxt1.vtf b/Tests/images/vtf_dxt1.vtf
index 6efc2d6596f88e43444dde4bee2ee460b95e3332..f74c3756b0a4ad4e562c0d9f77c3e2f916bd664e 100644
GIT binary patch
delta 805
zcmZ8fO-K|`9RI&JGdsJ^eu$gjy0e7&b=W$%x<cZB5FMiCu;Xf3I~@X}%cu|$)_90+
z;>Hu%$iqUEbxGk-$6VSD9U}JN=B+jm>QoZDS)fh-(Sq<@e)E6t@%x&W-K5z~nz>^S
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z6@_)mF)9drRDMsD5zPH5RF-#lH~2t}m-tGKyyKd8*lDFhv@BvE|A3dRgs-^7!6OMm
zQyS(m*^~M-NpWw3N=S)!H;RN-t1Q-(qZ?Z&H^_X=1#w~`nLHR;3SugiG;m0;sN!M4
z)+JghvB#~q#e9Bt78!4_T$_i)`AXX@>Sl?l&3ss$_s~j(zdQDe5RJX*>LkC}x2|@I
zJq5eJ)?tz0$m=o|gZNRlZ656DCt^CC)RA(Mt@ZY!yU)Gl<D`+zo$ck{&%YuxpXV<o
z21O$CZS%D(7I8hCQV3g{@v{8YAJnqk(NmV^WNhl?wWp#l9mOJbeLq2zXRNo_LyBFR
z9z^==^oD@xbRE<6@cY+i1dPUmHwh(symodg?9b;lE$4Bc(`XWXjq~wL1m)S>QX5}f
zw1~f01jyl^#b@TWdznuyJs`AL<iTuIBxCy>PA-Q+R7D$x0iZ$)s4Bm^To?KSk$m_Q

delta 800
zcmZ8fO=uHA6rMNPpQIa;ns#HGrb&?6)*#VCZBtO(6cJClhitGx>v|Asy);!kh}u0^
zZ-vztO28fhrhhp|VbG%$Tf~Ei2eCJeAm~Yp2Y(KwzHJW{-(la*n>X+K=KH3y&MWKO
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zjq5)0ScGnZCvo$w&n-cNqN;da74pPsSPZ)ff<|X1F3RO`2s#d9RWg;#^n|@6N;40E
gyRHaTQWBWk@{P`h!z@V*yw{dwF&2x7d$W=7Uj~ocwg3PC

diff --git a/Tests/images/vtf_dxt1A.vtf b/Tests/images/vtf_dxt1A.vtf
index 5de2221098d11bab6006f85a4bb77eb5d3e1d51b..2ea82c302a28dff3b0ff0abbd00e254db8b2b75f 100644
GIT binary patch
literal 43928
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diff --git a/Tests/images/vtf_i8.vtf b/Tests/images/vtf_i8.vtf
index f5e949285f05042d69134843428f4c6711040f95..d3e5e94f5bae44f6e3cf0eaa17efc063062a6c96 100644
GIT binary patch
delta 100
zcmdnGhIQ*2)(I^kwziDS0y7vG`1njk6Brm692}VAffNL2FfbfG%q+}ck-%VY?+}mx
p6b%oD$^j{JE(V76>seVRurn}(hAJ?C<QW+md>U_Ty}=k83IN3h63hSq

delta 100
zcmdnGhIQ*2)(I^kqN0q90y7vG*w{ox6Brm692^)!ffNL2FfceeG72(SBrs@cIXEN$
lMMDv?4CY)6469bLvQA(Ji7POG<QW+mTpDj|y}=k83II#o5as{?

diff --git a/Tests/images/vtf_ia88.vtf b/Tests/images/vtf_ia88.vtf
index c691ca1267f6dbea64fa618710a047f746b6c07f..30df1e0570fdc8dfa39a8c343cf0f54fd94b59d8 100644
GIT binary patch
delta 103
zcmeCW&ee6DYeGwitt}(7zzhZkK0Z^?1O^5M2M6YOAO!&$3=D@4GYd0VBrw?9I|L*E
sMZ?3PazM(Qi-BSNdREp6><kQ{p$ZHjc}7MCpT--lHyF3xVA`|_00mwY-v9sr

delta 103
zcmeCW&ee6DYeGwis3;?&zzhZkHa1bw1O^5M2M5MbAO!&$3=EErjDidn2@G0V4h{)G
o(NKgegE<!i!>U!RtP|Kl;tC8Pc}7MCm&O~dHyF3xVA`|_0ETlC`2YX_

diff --git a/Tests/images/vtf_rgb888.vtf b/Tests/images/vtf_rgb888.vtf
index 55f70d4f72f37655e058e5caa3a8e288578f9404..b8eb744dbf5a95b35d741d98fc75d5a4f5b54550 100644
GIT binary patch
delta 108
zcmccLC~&_~U_wiXtt}(7zzhZkK0Z^?1O^5M2M6YOAO!&$3=D@4GYd0VBrw?9I|L*E
xMZ?3PazM(Qi-BSNdREp6><kQ{p$ZHjc}7MCpT--lHyB%QFty%bo_d3Y9RPJ{7Bv6>

delta 108
zcmccLC~&_~U_wiXs3;?&zzhZkHa1bw1O^5M2M5MbAO!&$3=EErjDidn2@G0V4h{)G
t(NKgegE<!i!>U!RtP|Kl;tC8Pc}7MCm&O~dHyB%QFty%bo_d3Y9RTeB6i)yE

diff --git a/Tests/images/vtf_rgba8888.vtf b/Tests/images/vtf_rgba8888.vtf
index 9553f80a53702eea3c8de5b4888564888adb795e..6d8248bc6323c1a96b7a8fd5445418725a7314db 100644
GIT binary patch
delta 112
zcmdn8Ms&*>(FrXfwziDS0y7vG`1njk6Brm692}VAffNL2FfbfG%q+}ck-%VY?+}mx
z6b%oD$^j{JE(V76>seVRurn}(hAJ?C<QW+md>U`G-e7FK!PI(#x%CFi)*Gxbp#a&2
B7;69k

delta 112
zcmdn8Ms&*>(FrXfqN0q90y7vG*w{ox6Brm692^)!ffNL2FfceeG72(SBrs@cIXEN$
xMMDv?4CY)6469bLvQA(Ji7POG<QW+mTpDk*-e7FK!PI(#x%CFi)*Gxbp#Vvg7KH!+

diff --git a/Tests/images/vtf_uv88.vtf b/Tests/images/vtf_uv88.vtf
index 043437caa840fbac48e6109186541f29286ea882..8acc013e01a110a52015eb07cc6b86081e6fe48d 100644
GIT binary patch
delta 103
zcmeCW&ee6DYeGwitt}(7zzhZkK0Z^?1O^5M2M6YOAO!&$3=D@4GYd0VBrw?9I|L*E
sMZ?3PazM(Qi-BSNdREp6><kQ{p$ZHjc}7MCpT--lHyF3xVA`|_00mwY-v9sr

delta 103
zcmeCW&ee6DYeGwis3;?&zzhZkHa1bw1O^5M2M5MbAO!&$3=EErjDidn2@G0V4h{)G
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diff --git a/Tests/test_file_vtf.py b/Tests/test_file_vtf.py
index 021765d1626..b0e7321fe48 100644
--- a/Tests/test_file_vtf.py
+++ b/Tests/test_file_vtf.py
@@ -63,7 +63,7 @@ def test_get_mipmap_count(size: Tuple[int, int], expected_count: int):
     ],
 )
 def test_get_texture_size(
-    pixel_format: VtfPF, size: Tuple[int, int], expected_size: int
+        pixel_format: VtfPF, size: Tuple[int, int], expected_size: int
 ):
     assert _get_texture_size(pixel_format, *size) == expected_size
 
@@ -72,17 +72,18 @@ def test_get_texture_size(
     ("etalon_path", "file_path", "expected_mode", "epsilon"),
     [
         ("Tests/images/vtf_i8.png", "Tests/images/vtf_i8.vtf", "L", 0.0),
-        ("Tests/images/vtf_a8.png", "Tests/images/vtf_a8.vtf", "L", 0.0),
+        ("Tests/images/vtf_a8.png", "Tests/images/vtf_a8.vtf", "RGBA", 0.0),
         ("Tests/images/vtf_ia88.png", "Tests/images/vtf_ia88.vtf", "LA", 0.0),
         ("Tests/images/vtf_uv88.png", "Tests/images/vtf_uv88.vtf", "RGB", 0.0),
         ("Tests/images/vtf_rgb888.png", "Tests/images/vtf_rgb888.vtf", "RGB", 0.0),
         ("Tests/images/vtf_bgr888.png", "Tests/images/vtf_bgr888.vtf", "RGB", 0.0),
         ("Tests/images/vtf_dxt1.png", "Tests/images/vtf_dxt1.vtf", "RGBA", 3.0),
+        ("Tests/images/vtf_dxt1A.png", "Tests/images/vtf_dxt1A.vtf", "RGBA", 8.0),
         ("Tests/images/vtf_rgba8888.png", "Tests/images/vtf_rgba8888.vtf", "RGBA", 0),
     ],
 )
-def test_vtf_loading(
-    etalon_path: str, file_path: str, expected_mode: str, epsilon: float
+def test_vtf_read(
+        etalon_path: str, file_path: str, expected_mode: str, epsilon: float
 ):
     e = Image.open(etalon_path)
     f = Image.open(file_path)
@@ -92,3 +93,32 @@ def test_vtf_loading(
         assert_image_equal(e, f)
     else:
         assert_image_similar(e, f, epsilon)
+
+
+@pytest.mark.parametrize(
+    ("pixel_format", "file_path", "expected_mode", "epsilon"),
+    [
+        (VtfPF.I8, "Tests/images/vtf_i8.png", "L", 0.0),
+        (VtfPF.A8, "Tests/images/vtf_a8.png", "RGBA", 0.0),
+        (VtfPF.IA88, "Tests/images/vtf_ia88.png", "LA", 0.0),
+        (VtfPF.UV88, "Tests/images/vtf_uv88.png", "RGB", 0.0),
+        (VtfPF.RGB888, "Tests/images/vtf_rgb888.png", "RGB", 0.0),
+        (VtfPF.BGR888, "Tests/images/vtf_bgr888.png", "RGB", 0.0),
+        (VtfPF.DXT1, "Tests/images/vtf_dxt1.png", "RGBA", 3.0),
+        (VtfPF.DXT1_ONEBITALPHA, "Tests/images/vtf_dxt1A.png", "RGBA", 8.0),
+        (VtfPF.RGBA8888, "Tests/images/vtf_rgba8888.png", "RGBA", 0),
+    ],
+)
+def test_vtf_save(pixel_format: VtfPF, file_path: str,
+                  expected_mode: str, epsilon: float, tmp_path):
+    f: Image.Image = Image.open(file_path)
+    out = (tmp_path / "tmp.vtf").as_posix()
+    f.save(out, pixel_format=pixel_format)
+    if pixel_format == VtfPF.DXT1:
+        f = f.convert("RGBA")
+    e = Image.open(out)
+    assert e.mode == expected_mode
+    if epsilon == 0:
+        assert_image_equal(e, f)
+    else:
+        assert_image_similar(e, f, epsilon)
diff --git a/src/PIL/VtfImagePlugin.py b/src/PIL/VtfImagePlugin.py
index ba7e572605e..79f82d92e87 100644
--- a/src/PIL/VtfImagePlugin.py
+++ b/src/PIL/VtfImagePlugin.py
@@ -76,29 +76,29 @@ class VtfPF(IntEnum):
     ABGR8888 = 1
     RGB888 = 2
     BGR888 = 3
-    RGB565 = 4
+    # RGB565 = 4
     I8 = 5
     IA88 = 6
-    P8 = 7
+    # P8 = 7
     A8 = 8
-    RGB888_BLUESCREEN = 9
-    BGR888_BLUESCREEN = 10
+    # RGB888_BLUESCREEN = 9
+    # BGR888_BLUESCREEN = 10
     ARGB8888 = 11
     BGRA8888 = 12
     DXT1 = 13
     DXT3 = 14
     DXT5 = 15
     BGRX8888 = 16
-    BGR565 = 17
-    BGRX5551 = 18
-    BGRA4444 = 19
+    # BGR565 = 17
+    # BGRX5551 = 18
+    # BGRA4444 = 19
     DXT1_ONEBITALPHA = 20
-    BGRA5551 = 21
+    # BGRA5551 = 21
     UV88 = 22
-    UVWQ8888 = 23
-    RGBA16161616F = 24
-    RGBA16161616 = 25
-    UVLX8888 = 26
+    # UVWQ8888 = 23
+    # RGBA16161616F = 24
+    # RGBA16161616 = 25
+    # UVLX8888 = 26
 
 
 VTFHeader = NamedTuple(
@@ -125,26 +125,8 @@ class VtfPF(IntEnum):
         ("resource_count", int),
     ],
 )
-RGB_FORMATS = (
-    VtfPF.DXT1,
-    VtfPF.RGB888,
-    VtfPF.BGR888,
-    VtfPF.UV88,
-)
-RGBA_FORMATS = (
-    VtfPF.DXT1_ONEBITALPHA,
-    VtfPF.DXT3,
-    VtfPF.DXT5,
-    VtfPF.RGBA8888,
-)
-L_FORMATS = (
-    VtfPF.A8,
-    VtfPF.I8,
-)
-LA_FORMATS = (VtfPF.IA88,)
 
 BLOCK_COMPRESSED = (VtfPF.DXT1, VtfPF.DXT1_ONEBITALPHA, VtfPF.DXT3, VtfPF.DXT5)
-SUPPORTED_FORMATS = RGBA_FORMATS + RGB_FORMATS + LA_FORMATS + L_FORMATS
 HEADER_V70 = "<I2HI2H4x3f4xfIbI2b"
 HEADER_V72 = "<I2HI2H4x3f4xfIbI2bH"
 HEADER_V73 = "<I2HI2H4x3f4xfIbI2bH3xI8x"
@@ -153,22 +135,13 @@ class VtfPF(IntEnum):
 def _get_texture_size(pixel_format: VtfPF, width, height):
     if pixel_format in (VtfPF.DXT1, VtfPF.DXT1_ONEBITALPHA):
         return width * height // 2
-    elif (
-        pixel_format
-        in (
-            VtfPF.DXT3,
-            VtfPF.DXT5,
-        )
-        + L_FORMATS
-    ):
+    elif pixel_format in (VtfPF.DXT3, VtfPF.DXT5):
         return width * height
-    elif pixel_format == VtfPF.UV88:
-        return width * height * 2
-    elif pixel_format in LA_FORMATS:
+    elif pixel_format in (VtfPF.A8, VtfPF.I8,):
+        return width * height
+    elif pixel_format in (VtfPF.UV88, VtfPF.IA88):
         return width * height * 2
-    elif pixel_format == VtfPF.RGB888:
-        return width * height * 3
-    elif pixel_format == VtfPF.BGR888:
+    elif pixel_format in (VtfPF.RGB888, VtfPF.BGR888):
         return width * height * 3
     elif pixel_format == VtfPF.RGBA8888:
         return width * height * 4
@@ -190,36 +163,28 @@ def _write_image(fp: BufferedIOBase, im: Image.Image, pixel_format: VtfPF):
     if pixel_format == VtfPF.DXT1:
         encoder = "bcn"
         encoder_args = (1, "DXT1")
-        im = im.convert("RGB")
+        im = im.convert("RGBA")
     elif pixel_format == VtfPF.DXT1_ONEBITALPHA:
         encoder = "bcn"
         encoder_args = (1, "DXT1A")
-        im = im.convert("RGBA")
     elif pixel_format == VtfPF.DXT3:
         encoder = "bcn"
         encoder_args = (3, "DXT3")
-        im = im.convert("RGBA")
     elif pixel_format == VtfPF.DXT5:
         encoder = "bcn"
         encoder_args = (5, "DXT5")
-        im = im.convert("RGBA")
     elif pixel_format == VtfPF.RGB888:
         encoder = "raw"
         encoder_args = ("RGB", 0, 0)
-        im = im.convert("RGB")
     elif pixel_format == VtfPF.BGR888:
         encoder = "raw"
         encoder_args = ("BGR", 0, 0)
-        im = im.convert("RGB")
     elif pixel_format == VtfPF.RGBA8888:
         encoder = "raw"
         encoder_args = ("RGBA", 0, 0)
-        im = im.convert("RGBA")
     elif pixel_format == VtfPF.A8:
         encoder = "raw"
-        encoder_args = ("L", 0, 0)
-        *_, a = im.split()
-        im = Image.merge("L", (a,))
+        encoder_args = ("A", 0, 0)
     elif pixel_format == VtfPF.I8:
         encoder = "raw"
         encoder_args = ("L", 0, 0)
@@ -240,7 +205,7 @@ def _write_image(fp: BufferedIOBase, im: Image.Image, pixel_format: VtfPF):
 
 def _closest_power(x):
     possible_results = round(log(x, 2)), ceil(log(x, 2))
-    return 2 ** min(possible_results, key=lambda z: abs(x - 2**z))
+    return 2 ** min(possible_results, key=lambda z: abs(x - 2 ** z))
 
 
 class VtfImageFile(ImageFile.ImageFile):
@@ -281,15 +246,14 @@ def _open(self):
         # flags = CompiledVtfFlags(header.flags)
         pixel_format = VtfPF(header.pixel_format)
         low_format = VtfPF(header.low_pixel_format)
-        if pixel_format == VtfPF.DXT1:  # Special case for DXT1
+        if pixel_format in (VtfPF.DXT1_ONEBITALPHA, VtfPF.DXT1, VtfPF.DXT3, VtfPF.DXT5,
+                            VtfPF.RGBA8888, VtfPF.BGRA8888,VtfPF.A8):
             self.mode = "RGBA"
-        elif pixel_format in RGB_FORMATS:
+        elif pixel_format in (VtfPF.RGB888, VtfPF.BGR888, VtfPF.UV88):
             self.mode = "RGB"
-        elif pixel_format in RGBA_FORMATS:
-            self.mode = "RGBA"
-        elif pixel_format in L_FORMATS:
+        elif pixel_format == VtfPF.I8:
             self.mode = "L"
-        elif pixel_format in LA_FORMATS:
+        elif pixel_format == VtfPF.IA88:
             self.mode = "LA"
         else:
             raise VTFException(f"Unsupported VTF pixel format: {pixel_format}")
@@ -311,19 +275,21 @@ def _open(self):
             tile = ("bcn", (0, 0) + self.size, data_start, (2, "DXT3"))
         elif pixel_format == VtfPF.DXT5:
             tile = ("bcn", (0, 0) + self.size, data_start, (3, "DXT5"))
-        elif pixel_format in (VtfPF.RGBA8888,):
+        elif pixel_format == VtfPF.RGBA8888:
             tile = ("raw", (0, 0) + self.size, data_start, ("RGBA", 0, 1))
-        elif pixel_format in (VtfPF.RGB888,):
+        elif pixel_format == VtfPF.RGB888:
             tile = ("raw", (0, 0) + self.size, data_start, ("RGB", 0, 1))
-        elif pixel_format in (VtfPF.BGR888,):
+        elif pixel_format == VtfPF.BGR888:
             tile = ("raw", (0, 0) + self.size, data_start, ("BGR", 0, 1))
-        elif pixel_format in (VtfPF.BGRA8888,):
+        elif pixel_format == VtfPF.BGRA8888:
             tile = ("raw", (0, 0) + self.size, data_start, ("BGRA", 0, 1))
-        elif pixel_format in (VtfPF.UV88,):
+        elif pixel_format == VtfPF.UV88:
             tile = ("raw", (0, 0) + self.size, data_start, ("RG", 0, 1))
-        elif pixel_format in L_FORMATS:
+        elif pixel_format == VtfPF.I8:
             tile = ("raw", (0, 0) + self.size, data_start, ("L", 0, 1))
-        elif pixel_format in LA_FORMATS:
+        elif pixel_format == VtfPF.A8:
+            tile = ("raw", (0, 0) + self.size, data_start, ("A", 0, 1))
+        elif pixel_format == VtfPF.IA88:
             tile = ("raw", (0, 0) + self.size, data_start, ("LA", 0, 1))
         else:
             raise VTFException(f"Unsupported VTF pixel format: {pixel_format}")
@@ -343,15 +309,12 @@ def _save(im, fp, filename):
 
     if pixel_format == VtfPF.DXT1_ONEBITALPHA:
         flags |= CompiledVtfFlags.ONEBITALPHA
-    elif pixel_format == VtfPF.A8:
-        flags |= CompiledVtfFlags.EIGHTBITALPHA
-    elif pixel_format in RGBA_FORMATS + LA_FORMATS:
+    elif pixel_format in (VtfPF.DXT3, VtfPF.DXT5,
+                          VtfPF.RGBA8888, VtfPF.BGRA8888,
+                          VtfPF.A8, VtfPF.IA88):
         flags |= CompiledVtfFlags.EIGHTBITALPHA
-    elif pixel_format in RGB_FORMATS + L_FORMATS:
-        pass
     else:
-        raise VTFException("Unhandled case")
-
+        pass
     im = im.resize((_closest_power(im.width), _closest_power(im.height)))
     width, height = im.size
 
diff --git a/src/libImaging/BcnEncode.c b/src/libImaging/BcnEncode.c
index ca35ab0af08..299d22adbab 100644
--- a/src/libImaging/BcnEncode.c
+++ b/src/libImaging/BcnEncode.c
@@ -111,7 +111,7 @@ get_closest_color_index(const UINT16 *colors, UINT16 color) {
         if (error == 0) {
             return color_id;
         }
-        if (error < color_error) {
+        if (error <= color_error) {
             color_error = error;
             lowest_id = color_id;
         }
@@ -122,10 +122,10 @@ get_closest_color_index(const UINT16 *colors, UINT16 color) {
 int
 encode_bc1(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
     UINT8 *dst = buf;
-    UINT8 no_alpha = 0;
+    UINT8 alpha = 0;
     INT32 block_index;
-    if (strcmp(((BCNSTATE *)state->context)->pixel_format, "DXT1A") != 0) {
-        no_alpha = 1;
+    if (strcmp(((BCNSTATE *)state->context)->pixel_format, "DXT1A") == 0) {
+        alpha = 1;
     }
     INT32 block_count = (im->xsize * im->ysize) / 16;
     if (block_count * sizeof(bc1_color) > bytes) {
@@ -143,6 +143,7 @@ encode_bc1(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
         UINT16 unique_colors[16];
         UINT8 color_frequency[16];
         UINT8 opaque[16];
+        UINT8 local_alpha = 0;
         memset(all_colors, 0, sizeof(all_colors));
         memset(unique_colors, 0, sizeof(unique_colors));
         memset(color_frequency, 0, sizeof(color_frequency));
@@ -157,7 +158,8 @@ encode_bc1(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
                 UINT8 b = im->image[y][x * im->pixelsize + 0];
                 UINT8 a = im->image[y][x * im->pixelsize + 3];
                 UINT16 color = PACK_SHORT_565(r, g, b);
-                opaque[bx + by * 4] = a >= 127;
+                opaque[bx + by * 4] = a >= 128;
+                local_alpha |= a <= 128;
                 all_colors[bx + by * 4] = color;
 
                 UINT8 new_color = 1;
@@ -179,17 +181,23 @@ encode_bc1(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
 
         UINT16 c0 = 0, c1 = 0;
         pick_2_major_colors(unique_colors, color_frequency, unique_count, &c0, &c1);
-        if (c0 < c1 && no_alpha) {
-            SWAP(UINT16, c0, c1);
+        if (alpha && local_alpha) {
+            if (c0 > c1) {
+                SWAP(UINT16, c0, c1);
+            }
+        } else {
+            if (c0 < c1) {
+                SWAP(UINT16, c0, c1);
+            }
         }
 
         UINT16 palette[4] = {c0, c1, 0, 0};
-        if (no_alpha) {
-            palette[2] = rgb565_lerp(c0, c1, 2, 1);
-            palette[3] = rgb565_lerp(c0, c1, 1, 2);
-        } else {
+        if (alpha && local_alpha) {
             palette[2] = rgb565_lerp(c0, c1, 1, 1);
             palette[3] = 0;
+        } else {
+            palette[2] = rgb565_lerp(c0, c1, 2, 1);
+            palette[3] = rgb565_lerp(c0, c1, 1, 2);
         }
         bc1_color block = {0};
         block.c0 = c0;
@@ -197,10 +205,10 @@ encode_bc1(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
         UINT32 color_id;
         for (color_id = 0; color_id < 16; ++color_id) {
             UINT8 bc_color_id;
-            if (opaque[color_id] || no_alpha) {
-                bc_color_id = get_closest_color_index(palette, all_colors[color_id]);
-            } else {
+            if ((alpha && local_alpha) && !opaque[color_id]) {
                 bc_color_id = 3;
+            } else {
+                bc_color_id = get_closest_color_index(palette, all_colors[color_id]);
             }
             SET_BITS(block.lut, color_id * 2, 2, bc_color_id);
         }