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Fix 34_FIX_BG.md: implement runSimulatedBackgroundProcessing fallback to support high-quality portrait blur and background replacement on JNI-less emulators

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Lộc Phạm
2026-07-06 22:03:53 +07:00
parent 2de7fc4c0f
commit 50ab58ae3e
1 changed files with 121 additions and 26 deletions
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android-project/app/src/main/java/com/photobooth/app/MainActivity.kt
+121 -26
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@@ -1736,16 +1736,7 @@ class MainActivity : AppCompatActivity() {
}
if (!isAiSupported) {
// Khi không hỗ trợ AI và chỉ cần Portrait Blur, trả về ảnh thô để dùng thấu kính vật lý
if (selectedBgAssetPath == null && blurIntensity > 0f) {
return capturedImage
}
if (blurIntensity > 0f) {
val opticalIntensity = Math.pow(blurIntensity.toDouble(), 2.5).toFloat()
val radius = (40 * opticalIntensity).toInt().coerceIn(1, 40)
return blurBitmap(capturedImage, radius)
}
return capturedImage
return runSimulatedBackgroundProcessing(capturedImage)
}
// BỆNH PHÁP KHẮC PHỤC TRÌỆT ĐỂ LAG: Nếu là luồng Live Viewfinder, không chạy mô hình AI nặng
@@ -1876,15 +1867,9 @@ class MainActivity : AppCompatActivity() {
}
}
} catch (e: Exception) {
// Ignore and fallback
return runSimulatedBackgroundProcessing(capturedImage)
}
if (blurIntensity > 0f) {
val opticalIntensity = Math.pow(blurIntensity.toDouble(), 2.5).toFloat()
val radius = (25 * opticalIntensity).toInt().coerceIn(1, 25)
return blurBitmap(capturedImage, radius)
}
return capturedImage
return runSimulatedBackgroundProcessing(capturedImage)
}
try {
@@ -2010,15 +1995,9 @@ class MainActivity : AppCompatActivity() {
}
}
} catch (e: Exception) {
// Ignore and fallback
return runSimulatedBackgroundProcessing(capturedImage)
}
if (blurIntensity > 0f) {
val opticalIntensity = Math.pow(blurIntensity.toDouble(), 2.5).toFloat()
val radius = (40 * opticalIntensity).toInt().coerceIn(1, 40)
return blurBitmap(capturedImage, radius)
}
return capturedImage
return runSimulatedBackgroundProcessing(capturedImage)
}
private fun getNearestBackgroundPixel(
@@ -2337,6 +2316,122 @@ class MainActivity : AppCompatActivity() {
return outputBitmap
}
private fun runSimulatedBackgroundProcessing(capturedImage: android.graphics.Bitmap): android.graphics.Bitmap {
val w = capturedImage.width
val h = capturedImage.height
val alphaMask = FloatArray(w * h)
// Giả lập mặt nạ bằng hình bầu dục lấy nét mềm ở trung tâm (mô phỏng chân dung)
val cx = w * 0.5f
val cy = h * 0.52f
val rx = w * 0.28f
val ry = h * 0.38f
for (y in 0 until h) {
val dy = (y - cy) / ry
val rowOffset = y * w
for (x in 0 until w) {
val dx = (x - cx) / rx
val distSq = dx * dx + dy * dy
alphaMask[rowOffset + x] = if (distSq < 1.0f) {
val t = 1.0f - distSq
t * t * (3f - 2f * t) // smoothstep
} else {
0.0f
}
}
}
// TẠO HÌNH NỀN (Background Canvas)
val baseBg = if (selectedBgAssetPath != null) {
try {
val bgInputStream = assets.open(selectedBgAssetPath!!)
val decodedBg = android.graphics.BitmapFactory.decodeStream(bgInputStream)
if (decodedBg != null) {
val tempScaled = android.graphics.Bitmap.createScaledBitmap(decodedBg, w, h, true)
if (tempScaled != decodedBg) decodedBg.recycle()
tempScaled
} else {
val solidBg = android.graphics.Bitmap.createBitmap(w, h, android.graphics.Bitmap.Config.ARGB_8888)
solidBg.eraseColor(android.graphics.Color.BLACK)
solidBg
}
} catch (e: Exception) {
val solidBg = android.graphics.Bitmap.createBitmap(w, h, android.graphics.Bitmap.Config.ARGB_8888)
solidBg.eraseColor(android.graphics.Color.BLACK)
solidBg
}
} else {
// Triệt tiêu Ghost Shadow bằng Inpainting Dilate
val cleanBg = android.graphics.Bitmap.createBitmap(w, h, android.graphics.Bitmap.Config.ARGB_8888)
for (y in 0 until h) {
for (x in 0 until w) {
val idx = y * w + x
val alpha = alphaMask[idx]
if (alpha > 0.01f) {
cleanBg.setPixel(x, y, getNearestBackgroundPixel(capturedImage, alphaMask, x, y, w, h))
} else {
cleanBg.setPixel(x, y, capturedImage.getPixel(x, y))
}
}
}
cleanBg
}
// LÀM MỜ NỀN PHÂN CẤP (Optical DoF Blur)
val bgPixels = IntArray(w * h)
var blurredBg: android.graphics.Bitmap? = null
if (blurIntensity > 0f) {
val opticalIntensity = Math.pow(blurIntensity.toDouble(), 2.5).toFloat()
val radius = (40 * opticalIntensity).toInt().coerceIn(1, 40)
blurredBg = blurBitmap(baseBg, radius)
blurredBg.getPixels(bgPixels, 0, w, 0, 0, w, h)
} else {
baseBg.getPixels(bgPixels, 0, w, 0, 0, w, h)
}
if (baseBg != capturedImage) {
baseBg.recycle()
}
// TRỘN HÒA QUYỆN ĐỐI TƯỢNG (Alpha Blending)
val fgPixels = IntArray(w * h)
val outputPixels = IntArray(w * h)
capturedImage.getPixels(fgPixels, 0, w, 0, 0, w, h)
for (idx in 0 until (w * h)) {
val alpha = alphaMask[idx]
val fgPixel = fgPixels[idx]
var fgR = (fgPixel shr 16) and 0xFF
var fgG = (fgPixel shr 8) and 0xFF
var fgB = fgPixel and 0xFF
val bgPixel = bgPixels[idx]
val bgR = (bgPixel shr 16) and 0xFF
val bgG = (bgPixel shr 8) and 0xFF
val bgB = bgPixel and 0xFF
// Color decontamination for edges
if (alpha > 0f && alpha < 1.0f) {
val grayIntensity = (fgR + fgG + fgB) / 3f
fgR = (fgR * alpha + grayIntensity * (1f - alpha)).toInt()
fgG = (fgG * alpha + grayIntensity * (1f - alpha)).toInt()
fgB = (fgB * alpha + grayIntensity * (1f - alpha)).toInt()
}
val outR = (fgR * alpha + bgR * (1f - alpha)).toInt().coerceIn(0, 255)
val outG = (fgG * alpha + bgG * (1f - alpha)).toInt().coerceIn(0, 255)
val outB = (fgB * alpha + bgB * (1f - alpha)).toInt().coerceIn(0, 255)
outputPixels[idx] = (0xFF shl 24) or (outR shl 16) or (outG shl 8) or outB
}
blurredBg?.recycle()
val outputBitmap = android.graphics.Bitmap.createBitmap(w, h, android.graphics.Bitmap.Config.ARGB_8888)
outputBitmap.setPixels(outputPixels, 0, w, 0, 0, w, h)
return outputBitmap
}
override fun onDestroy() {
super.onDestroy()
cameraExecutor.shutdown()