Add blurhash when available (c2e15c2b) · Commits · Android-smartphones / Fedilab

app/src/main/java/app/fedilab/android/mastodon/helper/BlurHashDecoder.kt

0 → 100644

+127 −0

Original line number	Diff line number	Diff line
		package app.fedilab.android.mastodon.helper


		import android.graphics.Bitmap
		import android.graphics.Color
		import kotlin.math.PI
		import kotlin.math.cos
		import kotlin.math.pow
		import kotlin.math.withSign

		class BlurHashDecoder {

		fun decode(blurHash: String?, width: Int, height: Int, punch: Float = 1f): Bitmap? {
		require(width > 0) { "Width must be greater than zero" }
		require(height > 0) { "height must be greater than zero" }
		if (blurHash == null \|\| blurHash.length < 6) {
		return null
		}
		val numCompEnc = decode83(blurHash, 0, 1)
		val numCompX = (numCompEnc % 9) + 1
		val numCompY = (numCompEnc / 9) + 1
		if (blurHash.length != 4 + 2 * numCompX * numCompY) {
		return null
		}
		val maxAcEnc = decode83(blurHash, 1, 2)
		val maxAc = (maxAcEnc + 1) / 166f
		val colors = Array(numCompX * numCompY) { i ->
		if (i == 0) {
		val colorEnc = decode83(blurHash, 2, 6)
		decodeDc(colorEnc)
		} else {
		val from = 4 + i * 2
		val colorEnc = decode83(blurHash, from, from + 2)
		decodeAc(colorEnc, maxAc * punch)
		}
		}
		return composeBitmap(width, height, numCompX, numCompY, colors)
		}

		private fun decode83(str: String, from: Int = 0, to: Int = str.length): Int {
		var result = 0
		for (i in from until to) {
		val index = charMap[str[i]] ?: -1
		if (index != -1) {
		result = result * 83 + index
		}
		}
		return result
		}

		private fun decodeDc(colorEnc: Int): FloatArray {
		val r = colorEnc shr 16
		val g = (colorEnc shr 8) and 255
		val b = colorEnc and 255
		return floatArrayOf(srgbToLinear(r), srgbToLinear(g), srgbToLinear(b))
		}

		private fun srgbToLinear(colorEnc: Int): Float {
		val v = colorEnc / 255f
		return if (v <= 0.04045f) {
		(v / 12.92f)
		} else {
		((v + 0.055f) / 1.055f).pow(2.4f)
		}
		}

		private fun decodeAc(value: Int, maxAc: Float): FloatArray {
		val r = value / (19 * 19)
		val g = (value / 19) % 19
		val b = value % 19
		return floatArrayOf(
		signedPow2((r - 9) / 9.0f) * maxAc,
		signedPow2((g - 9) / 9.0f) * maxAc,
		signedPow2((b - 9) / 9.0f) * maxAc
		)
		}

		private fun signedPow2(value: Float) = value.pow(2f).withSign(value)

		private fun composeBitmap(
		width: Int,
		height: Int,
		numCompX: Int,
		numCompY: Int,
		colors: Array<FloatArray>
		): Bitmap {
		val imageArray = IntArray(width * height)
		for (y in 0 until height) {
		for (x in 0 until width) {
		var r = 0f
		var g = 0f
		var b = 0f
		for (j in 0 until numCompY) {
		for (i in 0 until numCompX) {
		val basis = (cos(PI * x * i / width) * cos(PI * y * j / height)).toFloat()
		val color = colors[j * numCompX + i]
		r += color[0] * basis
		g += color[1] * basis
		b += color[2] * basis
		}
		}
		imageArray[x + width * y] =
		Color.rgb(linearToSrgb(r), linearToSrgb(g), linearToSrgb(b))
		}
		}
		return Bitmap.createBitmap(imageArray, width, height, Bitmap.Config.ARGB_8888)
		}

		private fun linearToSrgb(value: Float): Int {
		val v = value.coerceIn(0f, 1f)
		return if (v <= 0.0031308f) {
		(v * 12.92f * 255f + 0.5f).toInt()
		} else {
		((1.055f * v.pow(1 / 2.4f) - 0.055f) * 255 + 0.5f).toInt()
		}
		}

		private val charMap = listOf(
		'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
		'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
		'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
		'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '#', '$', '%', '*', '+', ',',
		'-', '.', ':', ';', '=', '?', '@', '[', ']', '^', '_', '{', '\|', '}', '~'
		)
		.mapIndexed { i, c -> c to i }
		.toMap()
		}
		No newline at end of file

app/src/main/java/app/fedilab/android/mastodon/ui/drawer/StatusAdapter.java

+15 −1

Original line number	Diff line number	Diff line
		@@ -39,8 +39,10 @@ import android.content.Context;
		import android.content.Intent;
		import android.content.SharedPreferences;
		import android.content.res.Configuration;
		import android.graphics.Bitmap;
		import android.graphics.PorterDuff;
		import android.graphics.Typeface;
		import android.graphics.drawable.BitmapDrawable;
		import android.graphics.drawable.Drawable;
		import android.os.Build;
		import android.os.Bundle;
		@@ -138,6 +140,7 @@ import app.fedilab.android.mastodon.client.entities.app.StatusCache;
		import app.fedilab.android.mastodon.client.entities.app.StatusDraft;
		import app.fedilab.android.mastodon.client.entities.app.Timeline;
		import app.fedilab.android.mastodon.exception.DBException;
		import app.fedilab.android.mastodon.helper.BlurHashDecoder;
		import app.fedilab.android.mastodon.helper.CrossActionHelper;
		import app.fedilab.android.mastodon.helper.GlideApp;
		import app.fedilab.android.mastodon.helper.GlideFocus;
		@@ -2211,13 +2214,24 @@ public class StatusAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
		boolean expand_media = sharedpreferences.getBoolean(context.getString(R.string.SET_EXPAND_MEDIA), false);
		RequestBuilder<Drawable> requestBuilder;
		GlideRequests glideRequests = GlideApp.with(context);
		Bitmap placeholder = null;
		if (attachment.blurhash != null) {
		placeholder = new BlurHashDecoder().decode(attachment.blurhash, 32, 32, 1f);
		}
		if (!isSensitive \|\| expand_media) {
		requestBuilder = glideRequests.asDrawable();
		if (!fullAttachement) {
		if (placeholder != null) {
		requestBuilder = requestBuilder.placeholder(new BitmapDrawable(context.getResources(), placeholder));
		}
		requestBuilder = requestBuilder.apply(new RequestOptions().transform(new GlideFocus(focusX, focusY)));
		requestBuilder = requestBuilder.dontAnimate();
		} else {
		if (placeholder != null) {
		requestBuilder = requestBuilder.placeholder(new BitmapDrawable(context.getResources(), placeholder));
		} else {
		requestBuilder = requestBuilder.placeholder(R.color.transparent_grey);
		}
		requestBuilder = requestBuilder.dontAnimate();
		requestBuilder = requestBuilder.apply(new RequestOptions().override((int) mediaW, (int) mediaH));
		requestBuilder = requestBuilder.fitCenter();