commit a950a86d225b7912e9878ecaa47da71acc88a66d
author Brian Osman <brianosman@google.com> Mon Feb 06 16:48:57 2017 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> Mon Feb 06 22:34:19 2017 +0000
tree 0f29715e522c225c8e24e4262a101b008e05ec70
parent 92eba8a5efc0860d4e95ba7f25052474a0bfca0c

Fix rounding error with tiled bitmap draws

We were snapping the top-left of the destination rectangle to integers,
but using the original (fractional) size. This led to us losing rows or
columns of pixels at the first tile boundary.

Also added a GM that demonstrates the bug (now renders correctly).

BUG=skia:

Change-Id: I50629dab9dd90fedad2c7e3393a1b1d1c7a8d45e
Reviewed-on: https://skia-review.googlesource.com/8102
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>

gn/gm.gni

diff --git a/gn/gm.gni b/gn/gm.gni
index 38e50b5..409376c 100644
--- a/gn/gm.gni
+++ b/gn/gm.gni
@@ -36,6 +36,7 @@
   "$_gm/bitmaprect.cpp",
   "$_gm/bitmaprecttest.cpp",
   "$_gm/bitmapshader.cpp",
+  "$_gm/bitmaptiled.cpp",
   "$_gm/bleed.cpp",
   "$_gm/blend.cpp",
   "$_gm/blurcircles.cpp",