skcms→56f2a09 add sRGB profile and ApproximatelyEqualProfiles()

Change-Id: Ic6408fdc8819342da175ec8b99b5838669b1b2ae
Reviewed-on: https://skia-review.googlesource.com/120501
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/third_party/skcms/skcms.h b/third_party/skcms/skcms.h
index 1e609dcd1a..2546f9c78c 100644
--- a/third_party/skcms/skcms.h
+++ b/third_party/skcms/skcms.h
@@ -99,6 +99,14 @@ typedef struct {
     skcms_A2B              A2B;
 } skcms_ICCProfile;
 
+// The sRGB color profile is so commonly used that we offer a canonical skcms_ICCProfile for it.
+extern const skcms_ICCProfile skcms_sRGB_profile;
+
+// Practical equality test for two skcms_ICCProfiles.
+// The implementation is subject to change, but it will always try to answer
+// "can I substitute A for B?" and "can I skip transforming from A to B?".
+bool skcms_ApproximatelyEqualProfiles(const skcms_ICCProfile* A, const skcms_ICCProfile* B);
+
 // Parse an ICC profile and return true if possible, otherwise return false.
 // The buffer is not copied, it must remain valid as long as the skcms_ICCProfile
 // will be used.