tree ddbfc5b976c891adf2e318008043a76e9c4a7f8d
parent e05162d15741eb642080a31f28c38a99b3142dfb
author robertphillips <robertphillips@google.com> 1417453767 -0800
committer Commit bot <commit-bot@chromium.org> 1417453767 -0800

Use variable length key (rather than accumulated matrix) as save layer hoisting key

Adding the rendering canvas' CTM to the layer hoisting key (i.e., Add support for hoisting layers in pictures drawn with a matrix - https://codereview.chromium.org/748853002/) has increased the cache miss rate due to accumulated floating point error. This CL fixes part of the issue by using the chain of operation indices leading to each saveLayer as the key. The canvas' CTM must still form part of the key but should be less subject to accumulated error.

BUG=skia:2315

Review URL: https://codereview.chromium.org/753253002