New avatar placeholder drawable generator.
Anton Chekulaev
5 years ago
parent
0da8613075
commit
c2c4c9f41a
@ -0,0 +1,83 @@
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package org.thoughtcrime.securesms.loki.todo
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import android.content.Context
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import android.graphics.*
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import android.graphics.drawable.BitmapDrawable
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import android.text.TextPaint
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import android.text.TextUtils
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import androidx.annotation.ColorInt
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import androidx.core.graphics.ColorUtils
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import network.loki.messenger.R
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import java.util.*
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object AvatarPlaceholderGenerator {
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private const val EMPTY_LABEL = "0";
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private val tmpFloatArray = FloatArray(3)
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fun generate(context: Context, pixelSize: Int, hashString: String, displayName: String?): BitmapDrawable {
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//TODO That should be replaced with a proper hash extraction code.
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val hash: Long
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val hexRegex = Regex("^[0-9A-Fa-f]+\$")
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if (hashString.length >= 12 && hashString.matches(hexRegex)) {
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hash = hashString.substring(0 until 12).toLong(16)
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} else {
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hash = hashString.toLong()
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}
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// Do not cache color array, it may be different depends on the current theme.
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val colorArray = context.resources.getIntArray(R.array.user_pic_placeholder_primary)
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val colorPrimary = colorArray[(hash % colorArray.size).toInt()]
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val colorSecondary = changeColorHueBy(colorPrimary, 16f)
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val labelText = when {
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!TextUtils.isEmpty(displayName) -> extractLabel(displayName!!)
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!TextUtils.isEmpty(hashString) -> extractLabel(hashString)
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else -> EMPTY_LABEL
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}
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val bitmap = Bitmap.createBitmap(pixelSize, pixelSize, Bitmap.Config.ARGB_8888)
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val canvas = Canvas(bitmap)
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// Draw background/frame
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val paint = Paint()
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paint.isAntiAlias = true
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paint.shader = LinearGradient(0f, 0f, 0f, pixelSize.toFloat(),
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colorPrimary,
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colorSecondary,
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Shader.TileMode.REPEAT)
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canvas.drawCircle(pixelSize.toFloat() / 2, pixelSize.toFloat() / 2, pixelSize.toFloat() / 2, paint)
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// Draw text
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val textPaint = TextPaint()
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textPaint.typeface = Typeface.create(Typeface.DEFAULT, Typeface.NORMAL)
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textPaint.isAntiAlias = true
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textPaint.textSize = pixelSize * 0.5f
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textPaint.color = Color.WHITE
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val areaRect = Rect(0, 0, pixelSize, pixelSize)
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val textBounds = RectF(areaRect)
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textBounds.right = textPaint.measureText(labelText)
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textBounds.bottom = textPaint.descent() - textPaint.ascent()
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textBounds.left += (areaRect.width() - textBounds.right) * 0.5f
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textBounds.top += (areaRect.height() - textBounds.bottom) * 0.5f
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canvas.drawText(labelText, textBounds.left, textBounds.top - textPaint.ascent(), textPaint)
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return BitmapDrawable(context.resources, bitmap)
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}
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@ColorInt
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private fun changeColorHueBy(@ColorInt color: Int, hueDelta: Float): Int {
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val hslColor = tmpFloatArray
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ColorUtils.colorToHSL(color, hslColor)
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hslColor[0] = (hslColor[0] + hueDelta) % 360f
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return ColorUtils.HSLToColor(hslColor)
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}
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private fun extractLabel(content: String): String {
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var content = content.trim()
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if (content.isEmpty()) return EMPTY_LABEL
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return content.first().toString().toUpperCase(Locale.ROOT)
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}
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}
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