* Use blurhash as image preview and as sensitive media cover, close #1571 * Fix focal point for blurhashes * Fix video indicator overlapping sensitive media indicator * Add a preference for blurhash * Add blurhash to report UI. * Introduce StatusDisplayOptionsmain
Ivan Kupalov
5 years ago
committed by
Konrad Pozniak
parent
40b859a06e
commit
8dcfec1734
@ -0,0 +1,130 @@ |
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/** |
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* Blurhash implementation from blurhash project: |
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* https://github.com/woltapp/blurhash |
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* Minor modifications by charlag |
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*/ |
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|
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package com.keylesspalace.tusky.util |
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|
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import android.graphics.Bitmap |
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import android.graphics.Color |
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import kotlin.math.PI |
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import kotlin.math.cos |
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import kotlin.math.pow |
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import kotlin.math.withSign |
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|
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object BlurHashDecoder { |
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fun decode(blurHash: String?, width: Int, height: Int, punch: Float = 1f): Bitmap? { |
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require(width > 0) { "Width must be greater than zero" } |
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require(height > 0) { "height must be greater than zero" } |
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if (blurHash == null || blurHash.length < 6) { |
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return null |
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} |
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val numCompEnc = decode83(blurHash, 0, 1) |
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val numCompX = (numCompEnc % 9) + 1 |
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val numCompY = (numCompEnc / 9) + 1 |
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if (blurHash.length != 4 + 2 * numCompX * numCompY) { |
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return null |
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} |
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val maxAcEnc = decode83(blurHash, 1, 2) |
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val maxAc = (maxAcEnc + 1) / 166f |
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val colors = Array(numCompX * numCompY) { i -> |
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if (i == 0) { |
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val colorEnc = decode83(blurHash, 2, 6) |
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decodeDc(colorEnc) |
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} else { |
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val from = 4 + i * 2 |
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val colorEnc = decode83(blurHash, from, from + 2) |
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decodeAc(colorEnc, maxAc * punch) |
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} |
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} |
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return composeBitmap(width, height, numCompX, numCompY, colors) |
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} |
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private fun decode83(str: String, from: Int = 0, to: Int = str.length): Int { |
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var result = 0 |
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for (i in from until to) { |
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val index = charMap[str[i]] ?: -1 |
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if (index != -1) { |
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result = result * 83 + index |
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} |
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} |
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return result |
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} |
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private fun decodeDc(colorEnc: Int): FloatArray { |
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val r = colorEnc shr 16 |
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val g = (colorEnc shr 8) and 255 |
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val b = colorEnc and 255 |
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return floatArrayOf(srgbToLinear(r), srgbToLinear(g), srgbToLinear(b)) |
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} |
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private fun srgbToLinear(colorEnc: Int): Float { |
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val v = colorEnc / 255f |
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return if (v <= 0.04045f) { |
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(v / 12.92f) |
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} else { |
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((v + 0.055f) / 1.055f).pow(2.4f) |
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} |
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} |
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private fun decodeAc(value: Int, maxAc: Float): FloatArray { |
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val r = value / (19 * 19) |
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val g = (value / 19) % 19 |
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val b = value % 19 |
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return floatArrayOf( |
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signedPow2((r - 9) / 9.0f) * maxAc, |
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signedPow2((g - 9) / 9.0f) * maxAc, |
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signedPow2((b - 9) / 9.0f) * maxAc |
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) |
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} |
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private fun signedPow2(value: Float) = value.pow(2f).withSign(value) |
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private fun composeBitmap( |
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width: Int, height: Int, |
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numCompX: Int, numCompY: Int, |
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colors: Array<FloatArray> |
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): Bitmap { |
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val bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888) |
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for (y in 0 until height) { |
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for (x in 0 until width) { |
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var r = 0f |
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var g = 0f |
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var b = 0f |
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for (j in 0 until numCompY) { |
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for (i in 0 until numCompX) { |
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val basis = (cos(PI * x * i / width) * cos(PI * y * j / height)).toFloat() |
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val color = colors[j * numCompX + i] |
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r += color[0] * basis |
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g += color[1] * basis |
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b += color[2] * basis |
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} |
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} |
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bitmap.setPixel(x, y, Color.rgb(linearToSrgb(r), linearToSrgb(g), linearToSrgb(b))) |
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} |
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} |
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return bitmap |
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} |
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private fun linearToSrgb(value: Float): Int { |
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val v = value.coerceIn(0f, 1f) |
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return if (v <= 0.0031308f) { |
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(v * 12.92f * 255f + 0.5f).toInt() |
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} else { |
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((1.055f * v.pow(1 / 2.4f) - 0.055f) * 255 + 0.5f).toInt() |
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} |
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} |
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private val charMap = listOf( |
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', |
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'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', |
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', |
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '#', '$', '%', '*', '+', ',', |
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'-', '.', ':', ';', '=', '?', '@', '[', ']', '^', '_', '{', '|', '}', '~' |
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) |
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.mapIndexed { i, c -> c to i } |
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.toMap() |
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} |
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@ -0,0 +1,14 @@ |
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package com.keylesspalace.tusky.util |
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data class StatusDisplayOptions( |
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@get:JvmName("animateAvatars") |
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val animateAvatars: Boolean, |
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@get:JvmName("mediaPreviewEnabled") |
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val mediaPreviewEnabled: Boolean, |
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@get:JvmName("useAbsoluteTime") |
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val useAbsoluteTime: Boolean, |
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@get:JvmName("showBotOverlay") |
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val showBotOverlay: Boolean, |
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@get:JvmName("useBlurhash") |
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val useBlurhash: Boolean |
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) |
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@ -0,0 +1,5 @@ |
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<?xml version="1.0" encoding="utf-8"?> |
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<shape xmlns:android="http://schemas.android.com/apk/res/android"> |
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<corners android:radius="8dp" /> |
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<solid android:color="?attr/sensitive_media_warning_background_color" /> |
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</shape> |
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