-
Notifications
You must be signed in to change notification settings - Fork 118
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
Showing
3 changed files
with
151 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
141 changes: 141 additions & 0 deletions
141
...in/java/ru/tech/imageresizershrinker/feature/filters/presentation/components/QrPainter.kt
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| /* | ||
| * ImageToolbox is an image editor for android | ||
| * Copyright (c) 2024 T8RIN (Malik Mukhametzyanov) | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| * You should have received a copy of the Apache License | ||
| * along with this program. If not, see <http://www.apache.org/licenses/LICENSE-2.0>. | ||
| */ | ||
|
|
||
| package ru.tech.imageresizershrinker.feature.filters.presentation.components | ||
|
|
||
| import android.graphics.Bitmap | ||
| import androidx.compose.material3.MaterialTheme | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.graphics.asImageBitmap | ||
| import androidx.compose.ui.graphics.painter.BitmapPainter | ||
| import androidx.compose.ui.graphics.toArgb | ||
| import androidx.compose.ui.platform.LocalDensity | ||
| import androidx.compose.ui.unit.Dp | ||
| import androidx.compose.ui.unit.dp | ||
| import com.google.zxing.BarcodeFormat | ||
| import com.google.zxing.EncodeHintType | ||
| import com.google.zxing.WriterException | ||
| import com.google.zxing.qrcode.QRCodeWriter | ||
| import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.withContext | ||
|
|
||
| /** | ||
| * Creates a [BitmapPainter] that draws a QR code for the given [content]. | ||
| * The [size] parameter defines the size of the QR code in dp. | ||
| * The [padding] parameter defines the padding of the QR code in dp. | ||
| */ | ||
| @Composable | ||
| fun rememberQrBitmapPainter( | ||
| content: String, | ||
| size: Dp = 150.dp, | ||
| padding: Dp = 0.5.dp, | ||
| foregroundColor: Color = MaterialTheme.colorScheme.onTertiaryContainer, | ||
| backgroundColor: Color = MaterialTheme.colorScheme.tertiaryContainer | ||
| ): BitmapPainter { | ||
|
|
||
| check(content.isNotEmpty()) { "Content must not be empty" } | ||
| check(size >= 0.dp) { "Size must be positive" } | ||
| check(padding >= 0.dp) { "Padding must be positive" } | ||
|
|
||
| val density = LocalDensity.current | ||
| val sizePx = with(density) { size.roundToPx() } | ||
| val paddingPx = with(density) { padding.roundToPx() } | ||
|
|
||
| val bitmapState = remember { | ||
| mutableStateOf<Bitmap?>(null) | ||
| } | ||
|
|
||
| // Use dependency on 'content' to re-trigger the effect when content changes | ||
| LaunchedEffect(content) { | ||
| bitmapState.value = generateQrBitmap( | ||
| content = content, | ||
| sizePx = sizePx, | ||
| paddingPx = paddingPx, | ||
| foregroundColor = foregroundColor, | ||
| backgroundColor = backgroundColor | ||
| ) | ||
| } | ||
|
|
||
| val bitmap = bitmapState.value ?: createDefaultBitmap(sizePx) | ||
|
|
||
| return remember(bitmap) { | ||
| BitmapPainter(bitmap.asImageBitmap()) | ||
| } | ||
| } | ||
|
|
||
|
|
||
| /** | ||
| * Generates a QR code bitmap for the given [content]. | ||
| * The [sizePx] parameter defines the size of the QR code in pixels. | ||
| * The [paddingPx] parameter defines the padding of the QR code in pixels. | ||
| * Returns null if the QR code could not be generated. | ||
| * This function is suspendable and should be called from a coroutine is thread-safe. | ||
| */ | ||
| private suspend fun generateQrBitmap( | ||
| content: String, | ||
| sizePx: Int, | ||
| paddingPx: Int, | ||
| foregroundColor: Color, | ||
| backgroundColor: Color | ||
| ): Bitmap? = withContext(Dispatchers.IO) { | ||
| val qrCodeWriter = QRCodeWriter() | ||
|
|
||
| // Set the QR code margin to the given padding | ||
| val encodeHints = mutableMapOf<EncodeHintType, Any?>() | ||
| .apply { | ||
| this[EncodeHintType.ERROR_CORRECTION] = ErrorCorrectionLevel.H | ||
| this[EncodeHintType.MARGIN] = paddingPx | ||
| } | ||
|
|
||
| try { | ||
| val bitmapMatrix = qrCodeWriter.encode( | ||
| content, BarcodeFormat.QR_CODE, | ||
| sizePx, sizePx, encodeHints | ||
| ) | ||
|
|
||
| val matrixWidth = bitmapMatrix.width | ||
| val matrixHeight = bitmapMatrix.height | ||
|
|
||
| val colors = IntArray(matrixWidth * matrixHeight) { index -> | ||
| val x = index % matrixWidth | ||
| val y = index / matrixWidth | ||
| val shouldColorPixel = bitmapMatrix.get(x, y) | ||
| if (shouldColorPixel) foregroundColor.toArgb() else backgroundColor.toArgb() | ||
| } | ||
|
|
||
| Bitmap.createBitmap(colors, matrixWidth, matrixHeight, Bitmap.Config.ARGB_8888) | ||
| } catch (ex: WriterException) { | ||
| null | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Creates a default bitmap with the given [sizePx]. | ||
| * The bitmap is transparent. | ||
| * This is used as a fallback if the QR code could not be generated. | ||
| * The bitmap is created on the UI thread. | ||
| */ | ||
| private fun createDefaultBitmap(sizePx: Int): Bitmap { | ||
| return Bitmap.createBitmap(sizePx, sizePx, Bitmap.Config.ARGB_8888).apply { | ||
| eraseColor(Color.Transparent.toArgb()) | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters