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| author |  commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2014-01-27 15:41:07 +0000 |
|---|---|---|
| committer | commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> | 2014-01-27 15:41:07 +0000 |
| commit | 0e8d0d6cdc2e02946b099006d0a47e60764905e5 (patch) | |
| tree | d9c1821958062fe38b98ed6a59021baacf0930ba /include/core/SkBitmap.h | |
| parent | 83c39db91313340cf05650a2a0a52a21f487b73d (diff) | |
add optional SkAlphaType parameter to notifyPixelsChanged
R=scroggo@google.com, halcanary@google.com, robertphillips@google.com
Author: reed@google.com
Review URL: https://codereview.chromium.org/147213002
git-svn-id: http://skia.googlecode.com/svn/trunk@13192 2bbb7eff-a529-9590-31e7-b0007b416f81
Diffstat (limited to 'include/core/SkBitmap.h')
| -rw-r--r-- | include/core/SkBitmap.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h index 4dcf327226..1dd2c8034f 100644 --- a/include/core/SkBitmap.h +++ b/include/core/SkBitmap.h @@ -128,6 +128,13 @@ public: * Set the bitmap's alphaType, returning true on success. If false is * returned, then the specified new alphaType is incompatible with the * Config, and the current alphaType is unchanged. + * + * Note: this changes the alphatype for the underlying pixels, which means + * that all bitmaps that might be sharing (subsets of) the pixels will + * be affected. This is an expensive change for some backends (e.g. GPU) + * since changing the alphatype can invalidate internal caches. Thus this + * call should only be made if it is associated with real changes to the + * pixel data. */ bool setAlphaType(SkAlphaType); |