Not set max decoded image size in WebCore.

Two reasons:
1. the image size will be limited in ImageSourceAndroid.cpp.
2. WebCore will do an estimation comparison against that max value, which
will limit some good cases.

For example, in the case of the following bug, the background image size is limited
and good, but its estimation value in WebCore will exceed the max.

issue: 3240499
Change-Id: I721c7565beb648dd83200d05e223012299997e04

1 files changed, 9 insertions, 2 deletions

diff --git a/WebKit/android/jni/WebSettings.cpp b/WebKit/android/jni/WebSettings.cpp
index c971493..e4b30c3 100644
--- a/WebKit/android/jni/WebSettings.cpp
+++ b/WebKit/android/jni/WebSettings.cpp
@@ -452,8 +452,15 @@ public:
         flag = env->GetBooleanField(obj, gFieldIds->mShrinksStandaloneImagesToFit);
         s->setShrinksStandaloneImagesToFit(flag);
         jlong maxImage = env->GetLongField(obj, gFieldIds->mMaximumDecodedImageSize);
-        if (maxImage == 0)
-            maxImage = computeMaxBitmapSizeForCache();
+        // Since in ImageSourceAndroid.cpp, the image will always not exceed
+        // MAX_SIZE_BEFORE_SUBSAMPLE, there's no need to pass the max value to
+        // WebCore, which checks (image_width * image_height * 4) as an
+        // estimation against the max value, which is done in CachedImage.cpp.
+        // And there're cases where the decoded image size will not
+        // exceed the max, but the WebCore estimation will.  So the following
+        // code is commented out to fix those cases.
+        // if (maxImage == 0)
+        //    maxImage = computeMaxBitmapSizeForCache();
         s->setMaximumDecodedImageSize(maxImage);
 
         flag = env->GetBooleanField(obj, gFieldIds->mPrivateBrowsingEnabled);