tree 99c78fbf2a71c8afe3140611cb97e1de3d4b53a1
parent 226fe6c926409f3b64b07f0b74e92e34cc0b515e
author zoran.jovanovic <zoran.jovanovic@sonymobile.com> 1429207396 -0700
committer Leon Scroggins <scroggo@google.com> 1430430645 +0000

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