Implement WebP image decoder.

image/DecoderFactory.cpp

@@ -5,6 +5,7 @@
 
 #include "DecoderFactory.h"
 
+#include "gfxPrefs.h"
 #include "nsMimeTypes.h"
 #include "mozilla/RefPtr.h"
 
@@ -17,6 +18,7 @@
 #include "nsBMPDecoder.h"
 #include "nsICODecoder.h"
 #include "nsIconDecoder.h"
+#include "nsWebPDecoder.h"
 
 namespace mozilla {
 
@@ -65,8 +67,12 @@ DecoderFactory::GetDecoderType(const char* aMimeType)
   // Icon
   } else if (!strcmp(aMimeType, IMAGE_ICON_MS)) {
     type = DecoderType::ICON;
-  }
 
+  // WebP
+  } else if (!strcmp(aMimeType, IMAGE_WEBP) &&
+             gfxPrefs::ImageWebPEnabled()) {
+    type = DecoderType::WEBP;
+  }
   return type;
 }
 
@@ -100,6 +106,9 @@ DecoderFactory::GetDecoder(DecoderType aType,
     case DecoderType::ICON:
       decoder = new nsIconDecoder(aImage);
       break;
+    case DecoderType::WEBP:
+      decoder = new nsWebPDecoder(aImage);
+      break;
     default:
       MOZ_ASSERT_UNREACHABLE("Unknown decoder type");
   }
@@ -171,7 +180,8 @@ DecoderFactory::CreateAnimationDecoder(DecoderType aType,
     return nullptr;
   }
 
-  MOZ_ASSERT(aType == DecoderType::GIF || aType == DecoderType::PNG,
+  MOZ_ASSERT(aType == DecoderType::GIF || aType == DecoderType::PNG ||
+             aType == DecoderType::WEBP,
              "Calling CreateAnimationDecoder for non-animating DecoderType");
 
   // Create an anonymous decoder. Interaction with the SurfaceCache and the