tree 72543d9e0b732a10ad99bb2e16926756b27680dc
parent 9da9ba688fd2e7a24aaaf17d0c817981267295cf
author zoran.jovanovic <zoran.jovanovic@sonymobile.com> 1429207396 -0700
committer The Android Automerger <android-build@android.com> 1441242645 -0700

SkScaledBitmapSampler: fix memory overwritten

Cherry-picked from https://codereview.chromium.org/1085253002
in Skia.

Memory will be overwritten while downsampling some
interlaced gif images, most commonly with odd sizes,
when index of destination row stores in the current
line computed from GifInterlaceIter meets:

 X is an integer in [0..height-1]
   and
 (X < height)
 && ((X - sampleSize/2) % sampleSize == 0)
 && ((X - sampleSize/2)/sampleSize >= height/sampleSize)

Signed-off-by: Lu Tong <lu.x.tong@sonymobile.com>

BUG=skia:

Review URL: https://codereview.chromium.org/1085253002

BUG:20723696
Change-Id: I2cca83a2a5c39b5a497f36b40724262b438ead8b