Bug 1795045 - qcms: Add support for only reading the curves from profiles. r=aosmond

We use this when reading the output profiles to avoid the
performance cost of doing the color transformation using LUTs
when the output profile has them.

This will let us enable ICCv4 everywhere.

Differential Revision: https://phabricator.services.mozilla.com/D159273

gfx/qcms/qcms.h

@@ -159,6 +159,7 @@ qcms_profile* qcms_profile_create_cicp(uint8_t colour_primaries,
                                        uint8_t transfer_characteristics);
 
 qcms_profile* qcms_profile_from_memory(const void *mem, size_t size);
+qcms_profile* qcms_profile_from_memory_curves_only(const void *mem, size_t size);
 
 qcms_profile* qcms_profile_from_file(FILE *file);
 qcms_profile* qcms_profile_from_path(const char *path);

gfx/qcms/src/c_bindings.rs

@@ -79,10 +79,21 @@ pub unsafe extern "C" fn qcms_profile_from_memory(
     size: usize,
 ) -> *mut Profile {
     let mem = slice::from_raw_parts(mem as *const libc::c_uchar, size);
-    let profile = Profile::new_from_slice(mem);
+    let profile = Profile::new_from_slice(mem, false);
     profile.map_or_else(null_mut, Box::into_raw)
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn qcms_profile_from_memory_curves_only(
+    mem: *const libc::c_void,
+    size: usize,
+) -> *mut Profile {
+    let mem = slice::from_raw_parts(mem as *const libc::c_uchar, size);
+    let profile = Profile::new_from_slice(mem, true);
+    profile.map_or_else(null_mut, Box::into_raw)
+}
+
+
 #[no_mangle]
 pub extern "C" fn qcms_profile_get_rendering_intent(profile: &Profile) -> Intent {
     profile.rendering_intent

gfx/qcms/src/gtest.rs

@@ -917,7 +917,7 @@ mod test {
         let mut file = std::fs::File::open(path).unwrap();
         let mut data = Vec::new();
         file.read_to_end(&mut data).unwrap();
-        Profile::new_from_slice(&data).unwrap()
+        Profile::new_from_slice(&data, false).unwrap()
     }
 
     #[test]

gfx/qcms/src/iccread.rs

@@ -22,7 +22,7 @@
 
 use std::{
     convert::TryInto,
-    sync::atomic::{AtomicBool, Ordering},
+    sync::atomic::AtomicBool,
     sync::Arc,
 };
 
@@ -1588,10 +1588,10 @@ impl Profile {
     }
 
     pub fn new_from_path(file: &str) -> Option<Box<Profile>> {
-        Profile::new_from_slice(&std::fs::read(file).ok()?)
+        Profile::new_from_slice(&std::fs::read(file).ok()?, false)
     }
 
-    pub fn new_from_slice(mem: &[u8]) -> Option<Box<Profile>> {
+    pub fn new_from_slice(mem: &[u8], curves_only: bool) -> Option<Box<Profile>> {
         let length: u32;
         let mut source: MemSource = MemSource {
             buf: mem,
@@ -1645,23 +1645,25 @@ impl Profile {
             || profile.class_type == COLOR_SPACE_PROFILE
         {
             if profile.color_space == RGB_SIGNATURE {
-                if let Some(A2B0) = find_tag(&index, TAG_A2B0) {
-                    let lut_type = read_u32(src, A2B0.offset as usize);
-                    if lut_type == LUT8_TYPE || lut_type == LUT16_TYPE {
-                        profile.A2B0 = read_tag_lutType(src, A2B0)
-                    } else if lut_type == LUT_MAB_TYPE {
-                        profile.mAB = read_tag_lutmABType(src, A2B0)
+                if !curves_only {
+                    if let Some(A2B0) = find_tag(&index, TAG_A2B0) {
+                        let lut_type = read_u32(src, A2B0.offset as usize);
+                        if lut_type == LUT8_TYPE || lut_type == LUT16_TYPE {
+                            profile.A2B0 = read_tag_lutType(src, A2B0)
+                        } else if lut_type == LUT_MAB_TYPE {
+                            profile.mAB = read_tag_lutmABType(src, A2B0)
+                        }
+                    }
+                    if let Some(B2A0) = find_tag(&index, TAG_B2A0) {
+                        let lut_type = read_u32(src, B2A0.offset as usize);
+                        if lut_type == LUT8_TYPE || lut_type == LUT16_TYPE {
+                            profile.B2A0 = read_tag_lutType(src, B2A0)
+                        } else if lut_type == LUT_MBA_TYPE {
+                            profile.mBA = read_tag_lutmABType(src, B2A0)
+                        }
                     }
                 }
-                if let Some(B2A0) = find_tag(&index, TAG_B2A0) {
-                    let lut_type = read_u32(src, B2A0.offset as usize);
-                    if lut_type == LUT8_TYPE || lut_type == LUT16_TYPE {
-                        profile.B2A0 = read_tag_lutType(src, B2A0)
-                    } else if lut_type == LUT_MBA_TYPE {
-                        profile.mBA = read_tag_lutmABType(src, B2A0)
-                    }
-                }
-                if find_tag(&index, TAG_rXYZ).is_some() || !SUPPORTS_ICCV4.load(Ordering::Relaxed) {
+                if find_tag(&index, TAG_rXYZ).is_some() || curves_only {
                     profile.redColorant = read_tag_XYZType(src, &index, TAG_rXYZ);
                     profile.greenColorant = read_tag_XYZType(src, &index, TAG_gXYZ);
                     profile.blueColorant = read_tag_XYZType(src, &index, TAG_bXYZ)
@@ -1670,7 +1672,7 @@ impl Profile {
                     return None;
                 }
 
-                if find_tag(&index, TAG_rTRC).is_some() || !SUPPORTS_ICCV4.load(Ordering::Relaxed) {
+                if find_tag(&index, TAG_rTRC).is_some() || curves_only {
                     profile.redTRC = read_tag_curveType(src, &index, TAG_rTRC);
                     profile.greenTRC = read_tag_curveType(src, &index, TAG_gTRC);
                     profile.blueTRC = read_tag_curveType(src, &index, TAG_bTRC);

gfx/thebes/gfxPlatform.cpp

@@ -2116,8 +2116,8 @@ void gfxPlatform::InitializeCMS() {
     nsTArray<uint8_t> outputProfileData =
         gfxPlatform::GetPlatform()->GetPlatformCMSOutputProfileData();
     if (!outputProfileData.IsEmpty()) {
-      gCMSOutputProfile = qcms_profile_from_memory(outputProfileData.Elements(),
-                                                   outputProfileData.Length());
+      gCMSOutputProfile = qcms_profile_from_memory_curves_only(outputProfileData.Elements(),
+                                                               outputProfileData.Length());
     }
   }