GlideCompose's contentScale cannot be previewed correctly.

[liyuhaolol]

I'm using implementation "com.github.bumptech.glide:compose:1.0.0-beta01". When I set the contentScale for GlideImage, the preview does not display the contentScale correctly. In the image below, the left side is using Glide and the right side is using Coil. I would like to know if this issue has been addressed promptly and fixed.

[xiangning17]

+1, I meet the same problem.

[xiangning17]

@liyuhaolol 用这个自定义的GlidePainter可以处理: Image(painter = painterGlide(model), contentDescription = null, modifier = modifier, contentScale = contentScale)

import android.content.Context
import android.graphics.drawable.Drawable
import android.graphics.drawable.PictureDrawable
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.drawscope.drawIntoCanvas
import androidx.compose.ui.graphics.nativeCanvas
import androidx.compose.ui.graphics.painter.Painter
import androidx.compose.ui.graphics.withSave
import androidx.compose.ui.platform.LocalContext
import com.bumptech.glide.Glide
import com.bumptech.glide.request.target.CustomTarget
import com.bumptech.glide.request.transition.Transition
import kotlin.math.roundToInt

/**
 * Author: xiangning
 * Date: 2024/8/14 22:15
 * Description:
 */
class GlidePainter(val context: Context, val model: Any) : Painter() {

    private var drawInvalidateTick by mutableStateOf(0)
    private var drawableIntrinsicSize by mutableStateOf(Size.Unspecified)

    private var target: Target? = null

    private var drawable: Drawable? = null

    override val intrinsicSize: Size
        get() = drawableIntrinsicSize

    override fun DrawScope.onDraw() {
        lazyStart(size)
        drawIntoCanvas { canvas ->
            // Reading this ensures that we invalidate when invalidateDrawable() is called
            drawInvalidateTick

            val d = drawable ?: return@drawIntoCanvas

            // Update the Drawable's bounds
            d.setBounds(0, 0, size.width.roundToInt(), size.height.roundToInt())

            canvas.withSave {
                d.draw(canvas.nativeCanvas)
            }
        }
    }

    private fun lazyStart(size: Size) {
        if (size.isEmpty()) {
            return
        }

        var oldW = 0
        var oldH = 0
        target?.getSize { width, height ->
            oldW = width
            oldH = height
        }
        val newW = size.width.toInt()
        val newH = size.height.toInt()
        // 只有新尺寸比之前的大才重新加载，不然就用之前的进行缩放也是可以的
        if (oldW >= newW && oldH >= newH) {
            return
        }

        Glide.with(context).clear(target)
        target = Glide.with(context)
            .load(model)
            .into(Target(newW, newH))
    }

    private inner class Target(width: Int, height: Int) : CustomTarget<Drawable>(width, height) {

        override fun onResourceReady(resource: Drawable, transition: Transition<in Drawable>?) {
            drawable = resource
            drawableIntrinsicSize = Size(resource.intrinsicWidth.toFloat(), resource.intrinsicHeight.toFloat())
            drawInvalidateTick++
        }

        override fun onLoadFailed(errorDrawable: Drawable?) {
            clearState()
        }

        override fun onLoadCleared(placeholder: Drawable?) {
            clearState()
        }

        private fun clearState() {
            if (target !== this) {
                return
            }

            drawable = null
            drawableIntrinsicSize = Size.Unspecified
            drawInvalidateTick++
        }

    }

}

@Composable
@Stable
fun painterGlide(model: Any): Painter {
    val context = LocalContext.current
    return remember(model) { GlidePainter(context, model) }
}