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Diffstat (limited to 'chrome/common/thumbnail_score.h')
| -rw-r--r-- | chrome/common/thumbnail_score.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/chrome/common/thumbnail_score.h b/chrome/common/thumbnail_score.h index 30bcf8f..39fe0e2 100644 --- a/chrome/common/thumbnail_score.h +++ b/chrome/common/thumbnail_score.h @@ -6,6 +6,7 @@ #define CHROME_COMMON_THUMBNAIL_SCORE_H_ #pragma once +#include <string> #include "base/time.h" // A set of metadata about a Thumbnail. @@ -27,6 +28,9 @@ struct ThumbnailScore { // Tests for equivalence between two ThumbnailScore objects. bool Equals(const ThumbnailScore& rhs) const; + // Returns string representation of this object. + std::string ToString() const; + // How "boring" a thumbnail is. The boring score is the 0,1 ranged // percentage of pixels that are the most common luma. Higher boring // scores indicate that a higher percentage of a bitmap are all the @@ -67,6 +71,10 @@ struct ThumbnailScore { // How bad a thumbnail needs to be before we completely ignore it. static const double kThumbnailMaximumBoringness; + // We consider a thumbnail interesting enough if the boring score is + // lower than this. + static const double kThumbnailInterestingEnoughBoringness; + // Time before we take a worse thumbnail (subject to // kThumbnailMaximumBoringness) over what's currently in the database // for freshness. @@ -74,6 +82,11 @@ struct ThumbnailScore { // Penalty of how much more boring a thumbnail should be per hour. static const double kThumbnailDegradePerHour; + + // Checks whether we should consider updating a new thumbnail based on + // this score. For instance, we don't have to update a new thumbnail + // if the current thumbnail is new and interesting enough. + bool ShouldConsiderUpdating(); }; // Checks whether we should replace one thumbnail with another. |