Merge pull request #22 from facelessuser/feature/srgb-linear

Expose access to srgb-linear

coloraide/colors/__init__.py

@@ -1,6 +1,7 @@
 """Colors."""
 from .hsv import HSV
 from .srgb import SRGB
+from .srgb_linear import SRGB_Linear
 from .hsl import HSL
 from .hwb import HWB
 from .lab import LAB
@@ -18,7 +19,7 @@
 DEF_DELTA_E = "76"
 
 SUPPORTED = (
-    HSL, HWB, LAB, LCH, SRGB, HSV,
+    HSL, HWB, LAB, LCH, SRGB, SRGB_Linear, HSV,
     Display_P3, A98_RGB, ProPhoto_RGB, Rec2020, XYZ
 )
 

coloraide/colors/srgb_linear.py

@@ -0,0 +1,44 @@
+"""SRGB Linear color class."""
+from ._space import RE_DEFAULT_MATCH
+from .srgb import SRGB, lin_srgb_to_xyz, xyz_to_lin_srgb, lin_srgb, gam_srgb
+from .xyz import XYZ
+from . import _convert as convert
+import re
+
+
+class SRGB_Linear(SRGB):
+    """SRGB linear."""
+
+    SPACE = "srgb-linear"
+    DEF_VALUE = "color(srgb-linear 0 0 0 / 1)"
+    DEFAULT_MATCH = re.compile(RE_DEFAULT_MATCH.format(color_space=SPACE))
+    WHITE = convert.WHITES["D65"]
+
+    def __init__(self, color=DEF_VALUE):
+        """Initialize."""
+
+        super().__init__(color)
+
+    @classmethod
+    def _to_srgb(cls, rgb):
+        """Linear sRGB to sRGB."""
+
+        return gam_srgb(rgb)
+
+    @classmethod
+    def _from_srgb(cls, rgb):
+        """sRGB to linear sRGB."""
+
+        return lin_srgb(rgb)
+
+    @classmethod
+    def _to_xyz(cls, rgb):
+        """SRGB Linear to XYZ."""
+
+        return cls._chromatic_adaption(cls.white(), XYZ.white(), lin_srgb_to_xyz(rgb))
+
+    @classmethod
+    def _from_xyz(cls, xyz):
+        """XYZ to SRGB Linear."""
+
+        return xyz_to_lin_srgb(cls._chromatic_adaption(XYZ.white(), cls.white(), xyz))

coloraide/css/colors/__init__.py

@@ -4,6 +4,7 @@
 from .hwb import HWB
 from .lab import LAB
 from .lch import LCH
+from ...colors import SRGB_Linear
 from ...colors import HSV
 from ...colors import Display_P3
 from ...colors import A98_RGB
@@ -13,7 +14,7 @@
 from ...colors import Color as GenericColor
 
 SUPPORTED = (
-    HSL, HWB, LAB, LCH, SRGB, HSV,
+    HSL, HWB, LAB, LCH, SRGB, SRGB_Linear, HSV,
     Display_P3, A98_RGB, ProPhoto_RGB, Rec2020, XYZ
 )
 

docs/src/markdown/about/changelog.md

@@ -2,6 +2,8 @@
 
 ## 0.1.0a2
 
+- **NEW**: Expose access to `srgb-linear` color space. This is mainly for development and testing and not listed in docs
+  currently.
 - **FIX**: Cylindrical spaces, when calling `overlay` can now request to be overlaid in a different space. This is
   because alpha composition does not work well in cylindrical spaces. HSL, HSV, and HWB will now request `overlay` to be
   done in sRGB, and LCH will request overlay to be done in LAB.

tests/test_roundtrip.py

@@ -29,7 +29,12 @@ def assert_round_trip(self, color):
     def test_srgb(self):
         """Test sRGB."""
 
-        self.assert_round_trip("rgb(10% 200% 50%)")
+        self.assert_round_trip("rgb(10% 100% 50%)")
+
+    def test_srgb_linear(self):
+        """Test sRGB Linear."""
+
+        self.assert_round_trip("color(srgb-linear 10% 100% 50%)")
 
     def test_hsl(self):
         """Test HSL."""