Set sRGB flag for PNGs with an sRGB chunk

src/codec/SkCodecPriv.h

 /*
  * Copyright 2015 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCodecPriv_DEFINED
 #define SkCodecPriv_DEFINED
 
@@ skipping 99 matching lines @@
 /*
  * Most of our codecs support the same conversions:
  * - profileType must be the same
  * - opaque to any alpha type
  * - 565 only if opaque
  * - premul to unpremul and vice versa
  * - always support N32
  * - otherwise match the src color type
  */
 inline bool conversion_possible(const SkImageInfo& dst, const SkImageInfo& src) {
-    if (dst.profileType() != src.profileType()) {
+    // FIXME: skbug.com/4895
+    // Currently, we treat both kLinear and ksRGB encoded images as if they are kLinear.
+    // This makes sense while we do not have proper support for ksRGB.  This is also
+    // the reason why we always allow the client to request kLinear.
+    if (dst.profileType() != src.profileType() &&
+            kLinear_SkColorProfileType != dst.profileType()) {
         return false;
     }
 
     // Ensure the alpha type is valid
     if (!valid_alpha(dst.alphaType(), src.alphaType())) {
         return false;
     }
 
     // Check for supported color types
     switch (dst.colorType()) {
@@ skipping 105 matching lines @@
     uint32_t result;
     memcpy(&result, &(buffer[i]), 4);
 #ifdef SK_CPU_BENDIAN
     return SkEndianSwap32(result);
 #else
     return result;
 #endif
 }
 
 #endif // SkCodecPriv_DEFINED