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Code Issues Packages Projects Releases Wiki Activity

android: scale bitmap down when loading, closes #805 (#812)

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This commit is contained in:
JRoberts
2022-07-14 12:13:22 +04:00
committed by GitHub
parent a7445afbf7
commit 9dd5a00a45
1 changed files with 36 additions and 5 deletions
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41
apps/android/app/src/main/java/chat/simplex/app/views/helpers/Util.kt
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@@ -27,12 +27,10 @@ import chat.simplex.app.BuildConfig
import chat.simplex.app.SimplexApp
import chat.simplex.app.model.CIFile
import kotlinx.coroutines.*
import java.io.File
import java.io.FileOutputStream
import java.io.*
import java.text.SimpleDateFormat
import java.util.*
import kotlin.math.log2
import kotlin.math.pow
import kotlin.math.*
fun withApi(action: suspend CoroutineScope.() -> Unit): Job = withScope(GlobalScope, action)
@@ -245,7 +243,7 @@ fun getLoadedImage(context: Context, file: CIFile?): Bitmap? {
val uri = FileProvider.getUriForFile(context, "${BuildConfig.APPLICATION_ID}.provider", File(filePath))
val parcelFileDescriptor = context.contentResolver.openFileDescriptor(uri, "r")
val fileDescriptor = parcelFileDescriptor?.fileDescriptor
val image = BitmapFactory.decodeFileDescriptor(fileDescriptor)
val image = decodeSampledBitmapFromFileDescriptor(fileDescriptor, 1000, 1000)
parcelFileDescriptor?.close()
image
} catch (e: Exception) {
@@ -256,6 +254,39 @@ fun getLoadedImage(context: Context, file: CIFile?): Bitmap? {
}
}
// https://developer.android.com/topic/performance/graphics/load-bitmap#load-bitmap
private fun decodeSampledBitmapFromFileDescriptor(fileDescriptor: FileDescriptor?, reqWidth: Int, reqHeight: Int): Bitmap {
// First decode with inJustDecodeBounds=true to check dimensions
return BitmapFactory.Options().run {
inJustDecodeBounds = true
BitmapFactory.decodeFileDescriptor(fileDescriptor, null, this)
// Calculate inSampleSize
inSampleSize = calculateInSampleSize(this, reqWidth, reqHeight)
// Decode bitmap with inSampleSize set
inJustDecodeBounds = false
BitmapFactory.decodeFileDescriptor(fileDescriptor, null, this)
}
}
private fun calculateInSampleSize(options: BitmapFactory.Options, reqWidth: Int, reqHeight: Int): Int {
// Raw height and width of image
val (height: Int, width: Int) = options.run { outHeight to outWidth }
var inSampleSize = 1
if (height > reqHeight || width > reqWidth) {
val halfHeight: Int = height / 2
val halfWidth: Int = width / 2
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while (halfHeight / inSampleSize >= reqHeight && halfWidth / inSampleSize >= reqWidth) {
inSampleSize *= 2
}
}
return inSampleSize
}
fun getFileName(context: Context, uri: Uri): String? {
return context.contentResolver.query(uri, null, null, null, null)?.use { cursor ->
val nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)