Fix HDR LUTs

cc/output/color_lut_cache.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/output/color_lut_cache.h"
 
 #include <stdint.h>
 #include <cmath>
 #include <vector>
 
@@ skipping 85 matching lines @@
 }
 
 ColorLUTCache::LUT ColorLUTCache::GetLUT(const gfx::ColorTransform* transform) {
   auto iter = lut_cache_.Get(transform);
   if (iter != lut_cache_.end()) {
     iter->second.last_used_frame = current_frame_;
     return iter->second.lut;
   }
 
   LUT lut;
-  // If input is HDR, and the output is scRGB, we're going to need
+  // If input is HDR, and the output is full range, we're going to need
   // to produce values outside of 0-1, so we'll need to make a half-float
   // LUT. Also, we'll need to build a larger lut to maintain accuracy.
-  // All LUT sizes should be odd a some transforms hav a knee at 0.5.
-  if (transform->GetDstColorSpace() == gfx::ColorSpace::CreateSCRGBLinear() &&
+  // All LUT sizes should be odd as some transforms have a knee at 0.5.
+  if (transform->GetDstColorSpace().FullRangeEncodedValues() &&
       transform->GetSrcColorSpace().IsHDR() && texture_half_float_linear_) {
     lut.size = 37;
     lut.texture = MakeLUT<uint16_t>(transform, lut.size);
   } else {
     lut.size = 17;
     lut.texture = MakeLUT<unsigned char>(transform, lut.size);
   }
   lut_cache_.Put(transform, CacheVal(lut, current_frame_));
   return lut;
 }
 
 void ColorLUTCache::Swap() {
   current_frame_++;
   while (!lut_cache_.empty() &&
          current_frame_ - lut_cache_.rbegin()->second.last_used_frame >
              kMaxFramesUnused) {
     gl_->DeleteTextures(1, &lut_cache_.rbegin()->second.lut.texture);
     lut_cache_.ShrinkToSize(lut_cache_.size() - 1);
   }
 }