android: 媒体库+MDT离线分析查看器(缩放/调色板/备注) 阶段4-5a

android/app/src/main/kotlin/com/mag160c/thermal/media/Mdt.kt

@@ -45,14 +45,14 @@ object Mdt {
      * @param jpg rendered image JPEG (offset 0, used as thumbnail + analysis base)
      * @param info0 camera info block from command 0x6BB6B66B (0x38B)
      * @param info1 second cached info block (0x38B) or null
-     * @param rawFrame latest raw USB frame (0x38-byte header + 38400B pixels)
+     * @param framePixels raw measurement frame (38400 bytes, 19200 x uint16 LE) or null
      * @param text UTF-8 note bytes or null
      */
     fun compose(
         jpg: ByteArray,
         info0: ByteArray?,
         info1: ByteArray?,
-        rawFrame: ByteArray?,
+        framePixels: ByteArray?,
         text: ByteArray? = null,
     ): ByteArray {
         val out = ByteArrayOutputStream(align4(jpg.size) + 0x88 + 38400 + 320)
@@ -72,9 +72,8 @@ object Mdt {
         }
         info0?.let { emit(BLOCK_INFO0, it) }
         info1?.let { emit(BLOCK_INFO1, it) }
-        val raw = rawFrame
-        if (raw != null && raw.size >= 0x1C + 38400) {
-            emit(BLOCK_FRAME, raw.copyOfRange(0x1C, 0x1C + 38400))
+        if (framePixels != null && framePixels.size == 38400) {
+            emit(BLOCK_FRAME, framePixels)
         }
         text?.let { emit(BLOCK_TXT, it) }
 

android/app/src/main/kotlin/com/mag160c/thermal/media/PhotoSaver.kt

@@ -25,9 +25,13 @@ object PhotoSaver {
     fun encodeJpeg(frame: IntArray, w: Int = 320, h: Int = 240, quality: Int = 92): ByteArray {
         val bmp = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888)
         bmp.setPixels(frame, 0, w, 0, 0, w, h)
-        val out = ByteArrayOutputStream(w * h / 4)
+        return encodeJpeg(bmp, quality)
+    }
+
+    /** Encode an existing bitmap to JPEG bytes. */
+    fun encodeJpeg(bmp: Bitmap, quality: Int = 92): ByteArray {
+        val out = ByteArrayOutputStream(bmp.width * bmp.height / 4)
         bmp.compress(Bitmap.CompressFormat.JPEG, quality, out)
-        bmp.recycle()
         return out.toByteArray()
     }
 

android/app/src/main/kotlin/com/mag160c/thermal/ui/analyze/AnalyzeViewModel.kt

@@ -0,0 +1,103 @@
+package com.mag160c.thermal.ui.analyze
+
+import android.app.Application
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.mag160c.thermal.media.Mdt
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+/**
+ * Offline MDT analysis state: loaded container, palette re-render, probes.
+ */
+class AnalyzeViewModel(
+    app: Application,
+    private val containerBytes: ByteArray,
+    private val fileUri: android.net.Uri,
+) : AndroidViewModel(app) {
+    val parsed: Mdt.Parsed? = Mdt.parse(containerBytes)
+
+    /** Raw measurement frame (19200 uint16) if present. */
+    val rawFrame: IntArray? by lazy {
+        parsed?.frame?.let { raw ->
+            val out = IntArray(19200)
+            for (i in out.indices) {
+                out[i] = (raw[i * 2].toInt() and 0xFF) or ((raw[i * 2 + 1].toInt() and 0xFF) shl 8)
+            }
+            out
+        }
+    }
+
+    private val _render = MutableStateFlow<Bitmap?>(null)
+    val render: StateFlow<Bitmap?> = _render
+
+    private val _paletteIndex = MutableStateFlow(2)
+    val paletteIndex: StateFlow<Int> = _paletteIndex
+
+    /** Re-render the raw frame with the given palette + auto window. */
+    fun render(paletteIdx: Int) {
+        val raw = rawFrame ?: return
+        _paletteIndex.value = paletteIdx
+        viewModelScope.launch(Dispatchers.Default) {
+            var mn = Int.MAX_VALUE
+            var mx = -1
+            for (v in raw) {
+                if (v < mn) mn = v
+                if (v > mx) mx = v
+            }
+            if (mx <= mn) mx = mn + 1
+            val pal = com.mag160c.thermal.core.Palettes.buildAll()[paletteIdx.coerceIn(0, 11)]
+            val argb = IntArray(19200)
+            val scale = (255 shl 12) / (mx - mn)
+            for (i in argb.indices) {
+                var g = ((raw[i] - mn) * scale) shr 8
+                if (g < 0) g = 0 else if (g > 255) g = 255
+                argb[i] = pal[g]
+            }
+            val bmp = Bitmap.createBitmap(160, 120, Bitmap.Config.ARGB_8888)
+            bmp.setPixels(argb, 0, 160, 0, 0, 160, 120)
+            withContext(Dispatchers.Main) { _render.value = bmp }
+        }
+    }
+
+    fun decodeNote(): String? {
+        val t = parsed?.text ?: return null
+        return String(t, Charsets.UTF_8)
+    }
+
+    /** Probe temperature approximation at a raw pixel (millidegrees C). */
+    fun probeTemp(x: Int, y: Int): Int? {
+        val raw = rawFrame ?: return null
+        if (x < 0 || y < 0 || x >= 160 || y >= 120) return null
+        return com.mag160c.thermal.core.TempMath.countsToTempMc(raw[y * 160 + x])
+    }
+
+    /** Save note: rewrite the container in place (jpg = current render). */
+    fun saveNote(note: String, onDone: (Boolean) -> Unit) {
+        val bmp = _render.value
+        if (bmp == null) {
+            onDone(false)
+            return
+        }
+        viewModelScope.launch(Dispatchers.IO) {
+            val jpg = com.mag160c.thermal.media.PhotoSaver.encodeJpeg(bmp)
+            val mdt = Mdt.compose(
+                jpg = jpg,
+                info0 = parsed?.info0,
+                info1 = parsed?.info1,
+                framePixels = parsed?.frame,
+                text = note.toByteArray(Charsets.UTF_8),
+            )
+            val ok = runCatching {
+                val ctx = getApplication<Application>()
+                ctx.contentResolver.openOutputStream(fileUri, "w")?.use { it.write(mdt) } != null
+            }.getOrDefault(false)
+            withContext(Dispatchers.Main) { onDone(ok) }
+        }
+    }
+}

android/app/src/main/kotlin/com/mag160c/thermal/ui/analyze/AnalyzeViewer.kt

@@ -0,0 +1,157 @@
+package com.mag160c.thermal.ui.analyze
+
+import android.graphics.Bitmap
+import androidx.compose.foundation.Canvas
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.gestures.detectTransformGestures
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.material3.AlertDialog
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.material3.TextButton
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.geometry.Offset
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.IntSize
+import androidx.compose.ui.unit.dp
+import com.mag160c.thermal.core.Palettes
+import com.mag160c.thermal.ui.gallery.GalleryViewModel
+
+/**
+ * Single-file MDT analysis viewer: pinch zoom/pan, palette re-render,
+ * text note editing.
+ */
+@Composable
+fun AnalyzeViewer(item: GalleryViewModel.Item, galleryVm: GalleryViewModel) {
+    val context = LocalContext.current
+    val vm = remember(item.name) {
+        val bytes = runCatching {
+            context.contentResolver.openInputStream(item.uri)?.use { it.readBytes() }
+        }.getOrNull() ?: ByteArray(0)
+        AnalyzeViewModel(context.applicationContext as android.app.Application, bytes, item.uri)
+    }
+    val render by vm.render.collectAsState()
+    val paletteIdx by vm.paletteIndex.collectAsState()
+    var zoom by remember { mutableStateOf(1f) }
+    var pan by remember { mutableStateOf(Offset.Zero) }
+    var showNote by remember { mutableStateOf(false) }
+    var note by remember { mutableStateOf(vm.decodeNote() ?: "") }
+
+    LaunchedEffect(Unit) { vm.render(2) }
+
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(Color.Black),
+    ) {
+        Canvas(
+            modifier = Modifier
+                .aspectRatio(4f / 3f)
+                .align(Alignment.Center)
+                .pointerInput(Unit) {
+                    detectTransformGestures { _, gesturePan, gestureZoom, _ ->
+                        zoom = (zoom * gestureZoom).coerceIn(1f, 4f)
+                        pan += gesturePan
+                        if (zoom <= 1.01f) {
+                            zoom = 1f
+                            pan = Offset.Zero
+                        }
+                    }
+                },
+        ) {
+            val img = render?.asImageBitmap()
+            if (img != null) {
+                val w = size.width * zoom
+                val h = size.height * zoom
+                val left = (size.width - w) / 2 + pan.x
+                val top = (size.height - h) / 2 + pan.y
+                drawImage(
+                    image = img,
+                    dstOffset = androidx.compose.ui.unit.IntOffset(left.toInt(), top.toInt()),
+                    dstSize = IntSize(w.toInt(), h.toInt()),
+                )
+            }
+        }
+        Row(
+            modifier = Modifier
+                .align(Alignment.BottomCenter)
+                .fillMaxWidth()
+                .background(Color(0x66000000))
+                .horizontalScroll(rememberScrollState())
+                .padding(vertical = 4.dp),
+            horizontalArrangement = Arrangement.SpaceEvenly,
+        ) {
+            Palettes.NAMES.forEachIndexed { idx, name ->
+                Text(
+                    name,
+                    color = if (paletteIdx == idx) MaterialTheme.colorScheme.primary else Color.White,
+                    modifier = Modifier
+                        .clickable { vm.render(idx) }
+                        .padding(horizontal = 10.dp, vertical = 8.dp),
+                )
+            }
+        }
+        Button(
+            onClick = { showNote = true },
+            modifier = Modifier
+                .align(Alignment.TopEnd)
+                .padding(12.dp),
+        ) {
+            Text("备注")
+        }
+        if (showNote) {
+            NoteEditor(
+                initial = note,
+                onSave = {
+                    note = it
+                    vm.saveNote(it) { }
+                    showNote = false
+                },
+                onDismiss = { showNote = false },
+            )
+        }
+    }
+}
+
+private fun IntOffsetCompat(x: Float, y: Float): Offset = Offset(x, y)
+
+@Composable
+private fun NoteEditor(initial: String, onSave: (String) -> Unit, onDismiss: () -> Unit) {
+    var text by remember { mutableStateOf(initial) }
+    AlertDialog(
+        onDismissRequest = onDismiss,
+        title = { Text("文字备注") },
+        text = {
+            OutlinedTextField(value = text, onValueChange = { text = it })
+        },
+        confirmButton = {
+            TextButton(onClick = { onSave(text) }) { Text("保存") }
+        },
+        dismissButton = {
+            TextButton(onClick = onDismiss) { Text("取消") }
+        },
+    )
+}

android/app/src/main/kotlin/com/mag160c/thermal/ui/gallery/GalleryScreen.kt

@@ -0,0 +1,103 @@
+package com.mag160c.thermal.ui.gallery
+
+import android.content.Intent
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.grid.GridCells
+import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Switch
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.asImageBitmap
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.compose.material3.Button
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.mag160c.thermal.ui.analyze.AnalyzeViewer
+
+@Composable
+fun GalleryScreen(vm: GalleryViewModel = viewModel()) {
+    val items by vm.items.collectAsState()
+    val context = LocalContext.current
+    var showViewer by remember { mutableStateOf(false) }
+
+    Column(modifier = Modifier.fillMaxSize()) {
+        Row(
+            modifier = Modifier.fillMaxWidth().padding(8.dp),
+            horizontalArrangement = Arrangement.SpaceBetween,
+            verticalAlignment = Alignment.CenterVertically,
+        ) {
+            Text("媒体库 (${items.size})", style = MaterialTheme.typography.titleMedium)
+            Button(onClick = { vm.refresh() }) { Text("刷新") }
+        }
+        LazyVerticalGrid(columns = GridCells.Fixed(if (isLandscape()) 4 else 3)) {
+            items(items.size) { idx ->
+                val item = items[idx]
+                var bmp by remember(item.name) { mutableStateOf<android.graphics.Bitmap?>(null) }
+                LaunchedEffect(item.name) {
+                    vm.thumbnail(item) { b -> bmp = b }
+                }
+                Box(
+                    modifier = Modifier
+                        .aspectRatio(4f / 3f)
+                        .background(MaterialTheme.colorScheme.surfaceVariant)
+                        .clickable {
+                            vm.select(item)
+                            showViewer = true
+                        },
+                ) {
+                    val b = bmp
+                    if (b != null) {
+                        Image(
+                            bitmap = b.asImageBitmap(),
+                            contentDescription = item.name,
+                            contentScale = ContentScale.Crop,
+                            modifier = Modifier.fillMaxSize(),
+                        )
+                    }
+                    Text(
+                        item.name.removePrefix("MAG160C_"),
+                        style = MaterialTheme.typography.labelSmall,
+                        color = Color.White,
+                        modifier = Modifier
+                            .align(Alignment.BottomStart)
+                            .padding(4.dp)
+                            .background(Color(0x88000000)),
+                    )
+                }
+            }
+        }
+    }
+
+    if (showViewer) {
+        val sel = vm.selected.value
+        if (sel != null) {
+            AnalyzeViewer(item = sel, galleryVm = vm)
+        }
+    }
+}
+
+@Composable
+private fun isLandscape(): Boolean =
+    androidx.compose.ui.platform.LocalConfiguration.current.orientation ==
+        android.content.res.Configuration.ORIENTATION_LANDSCAPE

android/app/src/main/kotlin/com/mag160c/thermal/ui/gallery/GalleryViewModel.kt

@@ -0,0 +1,123 @@
+package com.mag160c.thermal.ui.gallery
+
+import android.app.Application
+import android.content.ContentUris
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import android.provider.MediaStore
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.viewModelScope
+import com.mag160c.thermal.media.Mdt
+import java.util.concurrent.ConcurrentHashMap
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+/**
+ * Media library: lists MDT thermal files under DCIM/MAG160C via MediaStore
+ * with async embedded-JPEG thumbnails.
+ */
+class GalleryViewModel(app: Application) : AndroidViewModel(app) {
+    data class Item(
+        val id: Long,
+        val uri: android.net.Uri,
+        val name: String,
+        val size: Long,
+        val dateMs: Long,
+    )
+
+    private val _items = MutableStateFlow<List<Item>>(emptyList())
+    val items: StateFlow<List<Item>> = _items
+
+    private val _selected = MutableStateFlow<Item?>(null)
+    val selected: StateFlow<Item?> = _selected
+
+    private val thumbs = ConcurrentHashMap<String, Bitmap>()
+
+    init {
+        refresh()
+    }
+
+    fun refresh() {
+        viewModelScope.launch(Dispatchers.IO) {
+            val ctx = getApplication<Application>()
+            val uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI
+            val proj = arrayOf(
+                MediaStore.MediaColumns._ID,
+                MediaStore.MediaColumns.DISPLAY_NAME,
+                MediaStore.MediaColumns.DATE_MODIFIED,
+                MediaStore.MediaColumns.SIZE,
+            )
+            val list = ArrayList<Item>()
+            ctx.contentResolver.query(
+                uri, proj,
+                "${MediaStore.MediaColumns.RELATIVE_PATH} LIKE ?",
+                arrayOf("%DCIM/MAG160C%"),
+                "${MediaStore.MediaColumns.DATE_MODIFIED} DESC",
+            )?.use { c ->
+                while (c.moveToNext()) {
+                    val id = c.getLong(0)
+                    val name = c.getString(1) ?: ""
+                    val date = c.getLong(2) * 1000
+                    val size = c.getLong(3)
+                    if (size < 152 + 136) continue
+                    list.add(Item(id, ContentUris.withAppendedId(uri, id), name, size, date))
+                }
+            }
+            // validate MDT containers
+            val valid = list.filter { isMdt(it) }
+            withContext(Dispatchers.Main) { _items.value = valid }
+        }
+    }
+
+    private fun isMdt(item: Item): Boolean = runCatching {
+        val ctx = getApplication<Application>()
+        ctx.contentResolver.openInputStream(item.uri)?.use { s ->
+            val buf = ByteArray(152)
+            if (s.skip(item.size - 152) != item.size - 152) return false
+            var off = 0
+            while (off < 152) {
+                val n = s.read(buf, off, 152 - off)
+                if (n <= 0) return false
+                off += n
+            }
+            Mdt.u32(buf, 0) == Mdt.SECTION_TAIL
+        } ?: false
+    }.getOrDefault(false)
+
+    /** Embedded-JPEG thumbnail (async). */
+    fun thumbnail(item: Item, onReady: (Bitmap) -> Unit) {
+        thumbs[item.name]?.let { onReady(it); return }
+        viewModelScope.launch(Dispatchers.IO) {
+            val ctx = getApplication<Application>()
+            val bmp = runCatching {
+                ctx.contentResolver.openInputStream(item.uri)?.use { s ->
+                    val all = s.readBytes()
+                    val parsed = Mdt.parse(all)
+                    if (parsed != null) {
+                        BitmapFactory.decodeByteArray(parsed.jpg, 0, parsed.jpg.size)
+                    } else null
+                }
+            }.getOrNull()
+            if (bmp != null) {
+                thumbs[item.name] = bmp
+                withContext(Dispatchers.Main) { onReady(bmp) }
+            }
+        }
+    }
+
+    fun select(item: Item?) {
+        _selected.value = item
+    }
+
+    fun delete(item: Item) {
+        viewModelScope.launch(Dispatchers.IO) {
+            val ctx = getApplication<Application>()
+            runCatching { ctx.contentResolver.delete(item.uri, null, null) }
+            thumbs.remove(item.name)
+            refresh()
+        }
+    }
+}

android/app/src/main/kotlin/com/mag160c/thermal/ui/live/LiveViewModel.kt

@@ -100,11 +100,15 @@ class LiveViewModel(app: Application) : AndroidViewModel(app) {
         val frame = latestFrame ?: return
         val s = session
         val jpg = com.mag160c.thermal.media.PhotoSaver.encodeJpeg(frame)
+        val rawFrame = s.lastRawFrame
+        val pixels = if (rawFrame != null && rawFrame.size >= 0x1C + 38400) {
+            rawFrame.copyOfRange(0x1C, 0x1C + 38400)
+        } else null
         val mdt = com.mag160c.thermal.media.Mdt.compose(
             jpg = jpg,
             info0 = s.lastInfo0,
             info1 = s.lastInfo1,
-            rawFrame = s.lastRawFrame,
+            framePixels = pixels,
         )
         val saved = com.mag160c.thermal.media.PhotoSaver.saveMdt(
             context, mdt, com.mag160c.thermal.media.PhotoSaver.fileName(),