Support BGR;15, BGR;16 and BGR;24 access, unpacking and putdata

Tests/test_image_access.py

@@ -130,9 +130,16 @@ def color(mode):
         bands = Image.getmodebands(mode)
         if bands == 1:
             return 1
+        if mode in ("BGR;15", "BGR;16"):
+            # These modes have less than 8 bits per band
+            # So (1, 2, 3) cannot be roundtripped
+            return (16, 32, 49)
         return tuple(range(1, bands + 1))
 
     def check(self, mode, expected_color=None):
+        if self._need_cffi_access and mode.startswith("BGR;"):
+            pytest.skip("Support not added to deprecated module for BGR;* modes")
+
         if not expected_color:
             expected_color = self.color(mode)
 
@@ -203,6 +210,9 @@ def check(self, mode, expected_color=None):
             "F",
             "P",
             "PA",
+            "BGR;15",
+            "BGR;16",
+            "BGR;24",
             "RGB",
             "RGBA",
             "RGBX",

Tests/test_image_putdata.py

@@ -76,6 +76,15 @@ def test_mode_F():
     assert list(im.getdata()) == target
 
 
+@pytest.mark.parametrize("mode", ("BGR;15", "BGR;16", "BGR;24"))
+def test_mode_BGR(mode):
+    data = [(16, 32, 49), (32, 32, 98)]
+    im = Image.new(mode, (1, 2))
+    im.putdata(data)
+
+    assert list(im.getdata()) == data
+
+
 def test_array_B():
     # shouldn't segfault
     # see https://github.com/python-pillow/Pillow/issues/1008

Tests/test_lib_pack.py

@@ -344,6 +344,13 @@ def test_RGB(self):
             "RGB", "CMYK", 4, (250, 249, 248), (242, 241, 240), (234, 233, 233)
         )
 
+    def test_BGR(self):
+        self.assert_unpack("BGR;15", "BGR;15", 3, (8, 131, 0), (24, 0, 8), (41, 131, 8))
+        self.assert_unpack(
+            "BGR;16", "BGR;16", 3, (8, 64, 0), (24, 129, 0), (41, 194, 0)
+        )
+        self.assert_unpack("BGR;24", "BGR;24", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
+
     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(

src/_imaging.c

@@ -475,8 +475,10 @@
         case IMAGING_TYPE_FLOAT32:
             return PyFloat_FromDouble(pixel.f);
         case IMAGING_TYPE_SPECIAL:
-            if (strncmp(im->mode, "I;16", 4) == 0) {
+            if (im->bands == 1) {
                 return PyLong_FromLong(pixel.h);
+            } else {
+                return Py_BuildValue("BBB", pixel.b[0], pixel.b[1], pixel.b[2]);
             }
             break;
     }
@@ -599,7 +601,7 @@
                 } else if (tupleSize != 3) {
                     PyErr_SetString(PyExc_TypeError, "color must be int, or tuple of one or three elements");
                     return NULL;
-                } else if (!PyArg_ParseTuple(color, "Lii", &r, &g, &b)) {
+                } else if (!PyArg_ParseTuple(color, "iiL", &b, &g, &r)) {
                     return NULL;
                 }
                 if (!strcmp(im->mode, "BGR;15")) {
@@ -1571,21 +1573,46 @@
                 PyErr_SetString(PyExc_TypeError, must_be_sequence);
                 return NULL;
             }
-            int endian = strncmp(image->mode, "I;16", 4) == 0 ? (strcmp(image->mode, "I;16B") == 0 ? 2 : 1) : 0;
             double value;
-            for (i = x = y = 0; i < n; i++) {
-                set_value_to_item(seq, i);
-                if (scale != 1.0 || offset != 0.0) {
-                    value = value * scale + offset;
+            if (image->bands == 1) {
+                int bigendian;
+                if (image->type == IMAGING_TYPE_SPECIAL) {
+                    // I;16*
+                    bigendian = strcmp(image->mode, "I;16B") == 0;
                 }
-                if (endian == 0) {
-                    image->image8[y][x] = (UINT8)CLIP8(value);
-                } else {
-                    image->image8[y][x * 2 + (endian == 2 ? 1 : 0)] = CLIP8((int)value % 256);
-                    image->image8[y][x * 2 + (endian == 2 ? 0 : 1)] = CLIP8((int)value >> 8);
+                for (i = x = y = 0; i < n; i++) {
+                    set_value_to_item(seq, i);
+                    if (scale != 1.0 || offset != 0.0) {
+                        value = value * scale + offset;
+                    }
+                    if (image->type == IMAGING_TYPE_SPECIAL) {
+                        image->image8[y][x * 2 + (bigendian ? 1 : 0)] = CLIP8((int)value % 256);
+                        image->image8[y][x * 2 + (bigendian ? 0 : 1)] = CLIP8((int)value >> 8);
+                    } else {
+                        image->image8[y][x] = (UINT8)CLIP8(value);
+                    }
+                    if (++x >= (int)image->xsize) {
+                        x = 0, y++;
+                    }
                 }
-                if (++x >= (int)image->xsize) {
-                    x = 0, y++;
+            } else {
+                // BGR;*
+                int b;
+                for (i = x = y = 0; i < n; i++) {
+                    char ink[4];
+
+                    op = PySequence_Fast_GET_ITEM(seq, i);
+                    if (!op || !getink(op, image, ink)) {
+                        Py_DECREF(seq);
+                        return NULL;
+                    }
+                    /* FIXME: what about scale and offset? */
+                    for (b = 0; b < image->pixelsize; b++) {
+                        image->image8[y][x * image->pixelsize + b] = ink[b];
+                    }
+                    if (++x >= (int)image->xsize) {
+                        x = 0, y++;
+                    }
                 }
             }
             PyErr_Clear(); /* Avoid weird exceptions */

src/libImaging/Access.c

@@ -12,8 +12,8 @@
 #include "Imaging.h"
 
 /* use make_hash.py from the pillow-scripts repository to calculate these values */
-#define ACCESS_TABLE_SIZE 27
-#define ACCESS_TABLE_HASH 33051
+#define ACCESS_TABLE_SIZE 35
+#define ACCESS_TABLE_HASH 8940
 
 static struct ImagingAccessInstance access_table[ACCESS_TABLE_SIZE];
 
@@ -87,6 +87,31 @@ get_pixel_16(Imaging im, int x, int y, void *color) {
     memcpy(color, in, sizeof(UINT16));
 }
 
+static void
+get_pixel_BGR15(Imaging im, int x, int y, void *color) {
+    UINT8 *in = (UINT8 *)&im->image8[y][x * 2];
+    UINT16 pixel = in[0] + (in[1] << 8);
+    char *out = color;
+    out[0] = (pixel & 31) * 255 / 31;
+    out[1] = ((pixel >> 5) & 31) * 255 / 31;
+    out[2] = ((pixel >> 10) & 31) * 255 / 31;
+}
+
+static void
+get_pixel_BGR16(Imaging im, int x, int y, void *color) {
+    UINT8 *in = (UINT8 *)&im->image8[y][x * 2];
+    UINT16 pixel = in[0] + (in[1] << 8);
+    char *out = color;
+    out[0] = (pixel & 31) * 255 / 31;
+    out[1] = ((pixel >> 5) & 63) * 255 / 63;
+    out[2] = ((pixel >> 11) & 31) * 255 / 31;
+}
+
+static void
+get_pixel_BGR24(Imaging im, int x, int y, void *color) {
+    memcpy(color, &im->image8[y][x * 3], sizeof(UINT8) * 3);
+}
+
 static void
 get_pixel_32(Imaging im, int x, int y, void *color) {
     memcpy(color, &im->image32[y][x], sizeof(INT32));
@@ -134,6 +159,16 @@ put_pixel_16B(Imaging im, int x, int y, const void *color) {
     out[1] = in[0];
 }
 
+static void
+put_pixel_BGR1516(Imaging im, int x, int y, const void *color) {
+    memcpy(&im->image8[y][x * 2], color, 2);
+}
+
+static void
+put_pixel_BGR24(Imaging im, int x, int y, const void *color) {
+    memcpy(&im->image8[y][x * 3], color, 3);
+}
+
 static void
 put_pixel_32L(Imaging im, int x, int y, const void *color) {
     memcpy(&im->image8[y][x * 4], color, 4);
@@ -178,6 +213,9 @@ ImagingAccessInit() {
     ADD("F", get_pixel_32, put_pixel_32);
     ADD("P", get_pixel_8, put_pixel_8);
     ADD("PA", get_pixel_32_2bands, put_pixel_32);
+    ADD("BGR;15", get_pixel_BGR15, put_pixel_BGR1516);
+    ADD("BGR;16", get_pixel_BGR16, put_pixel_BGR1516);
+    ADD("BGR;24", get_pixel_BGR24, put_pixel_BGR24);
     ADD("RGB", get_pixel_32, put_pixel_32);
     ADD("RGBA", get_pixel_32, put_pixel_32);
     ADD("RGBa", get_pixel_32, put_pixel_32);

src/libImaging/Unpack.c

@@ -1239,6 +1239,12 @@ copy2(UINT8 *out, const UINT8 *in, int pixels) {
     memcpy(out, in, pixels * 2);
 }
 
+static void
+copy3(UINT8 *out, const UINT8 *in, int pixels) {
+    /* BGR;24 */
+    memcpy(out, in, pixels * 3);
+}
+
 static void
 copy4(UINT8 *out, const UINT8 *in, int pixels) {
     /* RGBA, CMYK quadruples */
@@ -1592,6 +1598,10 @@ static struct {
     {"RGB", "B;16B", 16, band216B},
     {"RGB", "CMYK", 32, cmyk2rgb},
 
+    {"BGR;15", "BGR;15", 16, copy2},
+    {"BGR;16", "BGR;16", 16, copy2},
+    {"BGR;24", "BGR;24", 24, copy3},
+
     /* true colour w. alpha */
     {"RGBA", "LA", 16, unpackRGBALA},
     {"RGBA", "LA;16B", 32, unpackRGBALA16B},