-
Notifications
You must be signed in to change notification settings - Fork 4.1k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
6 changed files
with
136 additions
and
65 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package io.legado.app.utils | ||
|
|
||
| import android.graphics.Bitmap | ||
| import android.graphics.BitmapFactory | ||
| import java.lang.ref.SoftReference | ||
| import java.util.concurrent.ConcurrentHashMap | ||
|
|
||
| object BitmapCache { | ||
|
|
||
| private val reusableBitmaps: MutableSet<SoftReference<Bitmap>> = ConcurrentHashMap.newKeySet() | ||
|
|
||
| fun add(bitmap: Bitmap) { | ||
| reusableBitmaps.add(SoftReference(bitmap)) | ||
| } | ||
|
|
||
| fun addInBitmapOptions(options: BitmapFactory.Options) { | ||
| // inBitmap only works with mutable bitmaps, so force the decoder to | ||
| // return mutable bitmaps. | ||
| options.inMutable = true | ||
|
|
||
| // Try to find a bitmap to use for inBitmap. | ||
| getBitmapFromReusableSet(options)?.also { inBitmap -> | ||
| // If a suitable bitmap has been found, set it as the value of | ||
| // inBitmap. | ||
| options.inBitmap = inBitmap | ||
| } | ||
| } | ||
|
|
||
|
|
||
| private fun getBitmapFromReusableSet(options: BitmapFactory.Options): Bitmap? { | ||
| if (reusableBitmaps.isEmpty()) { | ||
| return null | ||
| } | ||
| val iterator = reusableBitmaps.iterator() | ||
| while (iterator.hasNext()) { | ||
| val item = iterator.next().get() ?: continue | ||
| if (item.isMutable) { | ||
| // Check to see it the item can be used for inBitmap. | ||
| if (canUseForInBitmap(item, options)) { | ||
| // Remove from reusable set so it can't be used again. | ||
| iterator.remove() | ||
| return item | ||
| } | ||
| } else { | ||
| // Remove from the set if the reference has been cleared. | ||
| iterator.remove() | ||
| } | ||
| } | ||
| return null | ||
| } | ||
|
|
||
| private fun canUseForInBitmap( | ||
| candidate: Bitmap, | ||
| targetOptions: BitmapFactory.Options | ||
| ): Boolean { | ||
| // From Android 4.4 (KitKat) onward we can re-use if the byte size of | ||
| // the new bitmap is smaller than the reusable bitmap candidate | ||
| // allocation byte count. | ||
| val width: Int = targetOptions.outWidth / targetOptions.inSampleSize | ||
| val height: Int = targetOptions.outHeight / targetOptions.inSampleSize | ||
| val byteCount: Int = width * height * getBytesPerPixel(candidate.config) | ||
| return byteCount <= candidate.allocationByteCount | ||
| } | ||
|
|
||
| /** | ||
| * A helper function to return the byte usage per pixel of a bitmap based on its configuration. | ||
| */ | ||
| private fun getBytesPerPixel(config: Bitmap.Config): Int { | ||
| return when (config) { | ||
| Bitmap.Config.ARGB_8888 -> 4 | ||
| Bitmap.Config.RGB_565, Bitmap.Config.ARGB_4444 -> 2 | ||
| Bitmap.Config.ALPHA_8 -> 1 | ||
| else -> 1 | ||
| } | ||
| } | ||
|
|
||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters