From 8e60a5afe55bf5b7814cdb47b63ee9e8d3d830cb Mon Sep 17 00:00:00 2001
From: Jeff Muizelaar <jmuizelaar@mozilla.com>
Date: Wed, 17 Feb 2021 23:19:11 +0000
Subject: [PATCH] Bug 1693404 - Add Profile::new_XYZD50(). r=aosmond

This will be useful implementing Profile::approx_eq()

Differential Revision: https://phabricator.services.mozilla.com/D105518
---
 gfx/qcms/src/gtest.rs   | 15 +++++++++++++++
 gfx/qcms/src/iccread.rs | 29 ++++++++++++++++++++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/gfx/qcms/src/gtest.rs b/gfx/qcms/src/gtest.rs
index d47a4829e61b..3917de36331d 100644
--- a/gfx/qcms/src/gtest.rs
+++ b/gfx/qcms/src/gtest.rs
@@ -884,4 +884,19 @@ mod test {
         xfm.apply(&mut data);
         assert_eq!(data, [4, 30, 80]);
     }
+    #[test]
+    fn D50() {
+        let p1 = crate::Profile::new_sRGB();
+        let p2 = crate::Profile::new_XYZD50();
+        let xfm = crate::Transform::new(
+            &p1,
+            &p2,
+            crate::DataType::RGB8,
+            crate::Intent::default(),
+        )
+        .unwrap();
+        let mut data = [4, 30, 80];
+        xfm.apply(&mut data);
+        assert_eq!(data, [4, 4, 15]);
+    }
 }
diff --git a/gfx/qcms/src/iccread.rs b/gfx/qcms/src/iccread.rs
index 0113e17aff3e..740bac60a064 100644
--- a/gfx/qcms/src/iccread.rs
+++ b/gfx/qcms/src/iccread.rs
@@ -26,7 +26,7 @@ use std::{
     sync::Arc,
 };
 
-use crate::transform::{set_rgb_colorants, PrecacheOuput};
+use crate::{double_to_s15Fixed16Number, transform::{set_rgb_colorants, PrecacheOuput}};
 use crate::{matrix::Matrix, s15Fixed16Number, s15Fixed16Number_to_float, Intent, Intent::*};
 
 pub static SUPPORTS_ICCV4: AtomicBool = AtomicBool::new(cfg!(feature = "iccv4-enabled"));
@@ -932,6 +932,10 @@ fn curve_from_gamma(gamma: f32) -> Box<curveType> {
     Box::new(curveType::Curve(vec![float_to_u8Fixed8Number(gamma)]))
 }
 
+fn identity_curve() -> Box<curveType> {
+    Box::new(curveType::Curve(Vec::new()))
+}
+
 /* from lcms: cmsWhitePointFromTemp */
 /* tempK must be >= 4000. and <= 25000.
  * Invalid values of tempK will return
@@ -1031,6 +1035,29 @@ impl Profile {
         Profile::new_rgb_with_table(D65, Rec709Primaries, &table).unwrap()
     }
 
+    /// Create a new profile with D50 adopted white and identity transform functions
+    pub fn new_XYZD50() -> Box<Profile> {
+        let mut profile = profile_create();
+        profile.redColorant.X = double_to_s15Fixed16Number(1.);
+        profile.redColorant.Y = double_to_s15Fixed16Number(0.);
+        profile.redColorant.Z = double_to_s15Fixed16Number(0.);
+        profile.greenColorant.X = double_to_s15Fixed16Number(0.);
+        profile.greenColorant.Y = double_to_s15Fixed16Number(1.);
+        profile.greenColorant.Z = double_to_s15Fixed16Number(0.);
+        profile.blueColorant.X = double_to_s15Fixed16Number(0.);
+        profile.blueColorant.Y = double_to_s15Fixed16Number(0.);
+        profile.blueColorant.Z = double_to_s15Fixed16Number(1.);
+        profile.redTRC = Some(identity_curve());
+        profile.blueTRC = Some(identity_curve());
+        profile.greenTRC = Some(identity_curve());
+
+        profile.class_type = DISPLAY_DEVICE_PROFILE;
+        profile.rendering_intent = Perceptual;
+        profile.color_space = RGB_SIGNATURE;
+        profile.pcs = XYZ_TYPE;
+        profile
+    }
+
     pub fn new_gray_with_gamma(gamma: f32) -> Box<Profile> {
         let mut profile = profile_create();