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99 changes: 99 additions & 0 deletions
99
lib-common/src/main/java/com/xiaoyv/common/helper/PositionCropTransformation.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| package com.xiaoyv.common.helper | ||
|
|
||
| import android.graphics.Bitmap | ||
| import android.graphics.Canvas | ||
| import android.graphics.Matrix | ||
| import android.graphics.Paint | ||
| import androidx.annotation.FloatRange | ||
| import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool | ||
| import com.bumptech.glide.load.resource.bitmap.BitmapTransformation | ||
| import com.bumptech.glide.load.resource.bitmap.TransformationUtils | ||
| import com.bumptech.glide.load.resource.bitmap.TransformationUtils.PAINT_FLAGS | ||
| import java.nio.charset.Charset | ||
| import java.security.MessageDigest | ||
|
|
||
| class PositionCropTransformation( | ||
| @FloatRange(from = 0.0, to = 1.0) val xPercentage: Float = 0.0f, | ||
| @FloatRange(from = 0.0, to = 1.0) val yPercentage: Float = 0.0f, | ||
| ) : BitmapTransformation() { | ||
|
|
||
| companion object { | ||
| private const val ID = "com.testbook.tbapp.base.utils.TopRightCropTransformation" | ||
| private val idBytes = ID.toByteArray(Charset.forName("UTF-8")) | ||
| } | ||
|
|
||
| override fun updateDiskCacheKey(messageDigest: MessageDigest) { | ||
| messageDigest.update(idBytes) | ||
| } | ||
|
|
||
| override fun transform( | ||
| pool: BitmapPool, | ||
| toTransform: Bitmap, | ||
| outWidth: Int, | ||
| outHeight: Int, | ||
| ): Bitmap? { | ||
| val toReuse = pool[outWidth, outHeight, toTransform.config] | ||
| val transformed = crop(toReuse, toTransform, outWidth, outHeight, xPercentage, yPercentage) | ||
| if (toReuse != transformed) { | ||
| pool.put(toReuse) | ||
| } | ||
| return transformed | ||
| } | ||
|
|
||
| /** | ||
| * A potentially expensive operation to crop the given Bitmap so that it fills the given dimensions. This operation | ||
| * is significantly less expensive in terms of memory if a mutable Bitmap with the given dimensions is passed in | ||
| * as well. | ||
| * | ||
| * @param recycled A mutable Bitmap with dimensions width and height that we can load the cropped portion of toCrop | ||
| * into. | ||
| * @param toCrop The Bitmap to resize. | ||
| * @param width The width in pixels of the final Bitmap. | ||
| * @param height The height in pixels of the final Bitmap. | ||
| * @param xPercentage The horizontal percentage of the crop. 0.0f => left, 0.5f => center, 1.0f => right or anything in between 0 and 1 | ||
| * @param yPercentage The vertical percentage of the crop. 0.0f => top, 0.5f => center, 1.0f => bottom or anything in between 0 and 1 | ||
| * @return The resized Bitmap (will be recycled if recycled is not null). | ||
| */ | ||
| private fun crop( | ||
| recycled: Bitmap?, | ||
| toCrop: Bitmap?, | ||
| width: Int, | ||
| height: Int, | ||
| xPercentage: Float, | ||
| yPercentage: Float, | ||
| ): Bitmap? { | ||
| if (toCrop == null) { | ||
| return null | ||
| } else if (toCrop.width == width && toCrop.height == height) { | ||
| return toCrop | ||
| } | ||
| // From ImageView/Bitmap.createScaledBitmap. | ||
| val scale: Float | ||
| var dx = 0f | ||
| var dy = 0f | ||
| val m = Matrix() | ||
| if (toCrop.width * height > width * toCrop.height) { | ||
| scale = height.toFloat() / toCrop.height.toFloat() | ||
| dx = width - toCrop.width * scale | ||
| dx *= xPercentage | ||
| } else { | ||
| scale = width.toFloat() / toCrop.width.toFloat() | ||
| dy = height - toCrop.height * scale | ||
| dy *= yPercentage | ||
| } | ||
| m.setScale(scale, scale) | ||
| m.postTranslate((dx + 0.5f), (dy + 0.5f)) | ||
| val result: Bitmap = recycled ?: Bitmap.createBitmap(width, height, getSafeConfig(toCrop)!!) | ||
|
|
||
| // We don't add or remove alpha, so keep the alpha setting of the Bitmap we were given. | ||
| TransformationUtils.setAlpha(toCrop, result) | ||
| val canvas = Canvas(result) | ||
| val paint = Paint(PAINT_FLAGS) | ||
| canvas.drawBitmap(toCrop, m, paint) | ||
| return result | ||
| } | ||
|
|
||
| private fun getSafeConfig(bitmap: Bitmap): Bitmap.Config { | ||
| return bitmap.config | ||
| } | ||
| } |
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