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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.wallpaper.picker.preview.ui.util
import android.graphics.Point
import android.graphics.PointF
import android.graphics.Rect
import com.android.wallpaper.util.WallpaperCropUtils
import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
object FullResImageViewUtil {
private const val DEFAULT_WALLPAPER_MAX_ZOOM = 8f
fun getScaleAndCenter(
viewSize: Point,
rawWallpaperSize: Point,
cropRect: Rect?,
): ScaleAndCenter {
// Determine minimum zoom to fit maximum visible area of wallpaper on crop surface.
// defaultRawWallpaperRect represents a brand new wallpaper preview with no crop hints.
val defaultRawWallpaperRect =
WallpaperCropUtils.calculateVisibleRect(rawWallpaperSize, viewSize)
val visibleRawWallpaperRect = cropRect ?: defaultRawWallpaperRect
val centerPosition =
PointF(
visibleRawWallpaperRect.centerX().toFloat(),
visibleRawWallpaperRect.centerY().toFloat()
)
val defaultWallpaperZoom =
WallpaperCropUtils.calculateMinZoom(
Point(defaultRawWallpaperRect.width(), defaultRawWallpaperRect.height()),
viewSize
)
val visibleWallpaperZoom =
WallpaperCropUtils.calculateMinZoom(
Point(visibleRawWallpaperRect.width(), visibleRawWallpaperRect.height()),
viewSize
)
return ScaleAndCenter(
defaultWallpaperZoom,
defaultWallpaperZoom.coerceAtLeast(DEFAULT_WALLPAPER_MAX_ZOOM),
visibleWallpaperZoom,
centerPosition,
)
}
fun SubsamplingScaleImageView.getCropRect() = Rect().apply { visibleFileRect(this) }
data class ScaleAndCenter(
val minScale: Float,
val maxScale: Float,
val defaultScale: Float,
val center: PointF
)
}
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