WIP: add JNI wrappers

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/platform/Images.android.kt

@@ -14,7 +14,9 @@ import boofcv.android.ConvertBitmap
 import boofcv.struct.image.GrayU8
 import chat.simplex.common.R
 import chat.simplex.common.views.helpers.errorBitmap
+import chat.simplex.common.views.helpers.generateNewFileName
 import chat.simplex.common.views.helpers.getFileName
+import chat.simplex.common.views.helpers.removeFile
 import java.io.ByteArrayOutputStream
 import java.io.InputStream
 import java.net.URI
@@ -35,16 +37,14 @@ actual fun base64ToBitmap(base64ImageString: String): ImageBitmap {
 }
 
 actual fun resizeImageToStrSize(image: ImageBitmap, maxDataSize: Long): String {
-  var img = image
-  var str = compressImageStr(img)
-  while (str.length > maxDataSize) {
-    val ratio = sqrt(str.length.toDouble() / maxDataSize.toDouble())
-    val clippedRatio = min(ratio, 2.0)
-    val width = (img.width.toDouble() / clippedRatio).toInt()
-    val height = img.height * width / img.width
-    img = Bitmap.createScaledBitmap(img.asAndroidBitmap(), width, height, true).asImageBitmap()
-    str = compressImageStr(img)
-  }
+  val tmpFileName = generateNewFileName("IMG", "png", tmpDir)
+  val tmpFile = File(tmpDir, tmpFileName)
+  val output = FileOutputStream(tmpFile)
+  compressImageData(image, true).writeTo(output)
+  output.flush()
+  output.close()
+  var str = chatResizeImageToStrSize(tmpFileName, maxDataSize.toInt())
+  removeFile(tmpFileName)
   return str
 }
 

apps/multiplatform/common/src/commonMain/cpp/android/simplex-api.c

@@ -71,6 +71,7 @@ extern char *chat_write_file(chat_ctrl ctrl, const char *path, char *ptr, int le
 extern char *chat_read_file(const char *path, const char *key, const char *nonce);
 extern char *chat_encrypt_file(chat_ctrl ctrl, const char *from_path, const char *to_path);
 extern char *chat_decrypt_file(const char *from_path, const char *key, const char *nonce, const char *to_path);
+extern char *chat_resize_image_to_str_size(const char *from_path, int max_size);
 
 JNIEXPORT jobjectArray JNICALL
 Java_chat_simplex_common_platform_CoreKt_chatMigrateInit(JNIEnv *env, __unused jclass clazz, jstring dbPath, jstring dbKey, jstring confirm) {
@@ -244,3 +245,11 @@ Java_chat_simplex_common_platform_CoreKt_chatDecryptFile(JNIEnv *env, jclass cla
     (*env)->ReleaseStringUTFChars(env, to_path, _to_path);
     return res;
 }
+
+JNIEXPORT jstring JNICALL
+Java_chat_simplex_common_platform_CoreKt_chatResizeImageToStrSize(JNIEnv *env, jclass clazz, jstring from_path, jint max_size) {
+    const char *_from_path = encode_to_utf8_chars(env, from_path);
+    jstring res = decode_to_utf8_string(env, chat_resize_image_to_str_size(_from_path, max_size));
+    (*env)->ReleaseStringUTFChars(env, from_path, _from_path);
+    return res;
+}

apps/multiplatform/common/src/commonMain/cpp/desktop/simplex-api.c

@@ -44,6 +44,7 @@ extern char *chat_write_file(chat_ctrl ctrl, const char *path, char *ptr, int le
 extern char *chat_read_file(const char *path, const char *key, const char *nonce);
 extern char *chat_encrypt_file(chat_ctrl ctrl, const char *from_path, const char *to_path);
 extern char *chat_decrypt_file(const char *from_path, const char *key, const char *nonce, const char *to_path);
+extern char *chat_resize_image_to_str_size(const char *from_path, int max_size);
 
 // As a reference: https://stackoverflow.com/a/60002045
 jstring decode_to_utf8_string(JNIEnv *env, char *string) {
@@ -254,3 +255,11 @@ Java_chat_simplex_common_platform_CoreKt_chatDecryptFile(JNIEnv *env, jclass cla
     (*env)->ReleaseStringUTFChars(env, to_path, _to_path);
     return res;
 }
+
+JNIEXPORT jstring JNICALL
+Java_chat_simplex_common_platform_CoreKt_chatResizeImageToStrSize(JNIEnv *env, jclass clazz, jstring from_path, jint max_size) {
+    const char *_from_path = encode_to_utf8_chars(env, from_path);
+    jstring res = decode_to_utf8_string(env, chat_resize_image_to_str_size(_from_path, max_size));
+    (*env)->ReleaseStringUTFChars(env, from_path, _from_path);
+    return res;
+}

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/platform/Core.kt

@@ -35,6 +35,7 @@ external fun chatWriteFile(ctrl: ChatCtrl, path: String, buffer: ByteBuffer): St
 external fun chatReadFile(path: String, key: String, nonce: String): Array<Any>
 external fun chatEncryptFile(ctrl: ChatCtrl, fromPath: String, toPath: String): String
 external fun chatDecryptFile(fromPath: String, key: String, nonce: String, toPath: String): String
+external fun chatResizeImageToStrSize(fromPath: String, maxSize: Int): String
 
 val chatModel: ChatModel
   get() = chatController.chatModel

apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/platform/Images.kt

@@ -7,6 +7,7 @@ import java.io.InputStream
 import java.net.URI
 
 expect fun base64ToBitmap(base64ImageString: String): ImageBitmap
+// XXX: Not a part of platform services anymore?
 expect fun resizeImageToStrSize(image: ImageBitmap, maxDataSize: Long): String
 expect fun resizeImageToDataSize(image: ImageBitmap, usePng: Boolean, maxDataSize: Long): ByteArrayOutputStream
 expect fun cropToSquare(image: ImageBitmap): ImageBitmap

apps/multiplatform/common/src/desktopMain/kotlin/chat/simplex/common/platform/Images.desktop.kt

@@ -3,6 +3,8 @@ package chat.simplex.common.platform
 import androidx.compose.ui.graphics.*
 import boofcv.io.image.ConvertBufferedImage
 import boofcv.struct.image.GrayU8
+import chat.simplex.common.views.helpers.generateNewFileName
+import chat.simplex.common.views.helpers.removeFile
 import chat.simplex.res.MR
 import org.jetbrains.skia.Image
 import java.awt.RenderingHints
@@ -32,18 +34,17 @@ actual fun base64ToBitmap(base64ImageString: String): ImageBitmap {
 }
 
 actual fun resizeImageToStrSize(image: ImageBitmap, maxDataSize: Long): String {
-  var img = image
-  var str = compressImageStr(img)
-  while (str.length > maxDataSize) {
-    val ratio = sqrt(str.length.toDouble() / maxDataSize.toDouble())
-    val clippedRatio = kotlin.math.min(ratio, 2.0)
-    val width = (img.width.toDouble() / clippedRatio).toInt()
-    val height = img.height * width / img.width
-    img = img.scale(width, height)
-    str = compressImageStr(img)
-  }
+  val tmpFileName = generateNewFileName("IMG", "png", tmpDir)
+  val tmpFile = File(tmpDir, tmpFileName)
+  val output = FileOutputStream(tmpFile)
+  compressImageData(image, true).writeTo(output)
+  output.flush()
+  output.close()
+  var str = chatResizeImageToStrSize(tmpFileName, maxDataSize.toInt())
+  removeFile(tmpFileName)
   return str
 }
+
 actual fun resizeImageToDataSize(image: ImageBitmap, usePng: Boolean, maxDataSize: Long): ByteArrayOutputStream {
   var img = image
   var stream = compressImageData(img, usePng)