Node / meshtastic / Meshtastic-Android / files / core / ui / src / commonMain / kotlin / org / meshtastic / core / ui / util / QrUtils.kt

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T8b949e/*

* Copyright (c) 2026 Meshtastic LLC

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU General Public License as published by

* the Free Software Foundation, either version 3 of the License, or

* (at your option) any later version.

*

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

* GNU General Public License for more details.

*

* You should have received a copy of the GNU General Public License

* along with this program. If not, see <https://www.gnu.org/licenses/>.

*/

Tff7b72package T7ee787org.meshtastic.core.ui.util

Tff7b72import T7ee787androidx.compose.runtime.Composable

Tff7b72import T7ee787androidx.compose.ui.geometry.Offset

Tff7b72import T7ee787androidx.compose.ui.geometry.Size

Tff7b72import T7ee787androidx.compose.ui.graphics.Color

Tff7b72import T7ee787androidx.compose.ui.graphics.ImageBitmap

Tff7b72import T7ee787androidx.compose.ui.graphics.drawscope.CanvasDrawScope

Tff7b72import T7ee787androidx.compose.ui.graphics.painter.BitmapPainter

Tff7b72import T7ee787androidx.compose.ui.graphics.painter.Painter

Tff7b72import T7ee787androidx.compose.ui.unit.Density

Tff7b72import T7ee787androidx.compose.ui.unit.LayoutDirection

Tff7b72import T7ee787qrcode.QRCode

Tff7b72import T7ee787qrcode.raw.ErrorCorrectionLevel

T8b949e/**

* Generates a QR code painter directly using the Skia/Compose canvas API in pure Kotlin.

*

* This implementation avoids any platform-specific bitmap APIs (like Android's [android.graphics.Bitmap] or Java AWT's

* BufferedImage), making it fully compatible with Android, Desktop, iOS, and Web.

*/

Tf0883e@SuppressTb4b4b4(Ta5d6ff"Ta5d6ffMagicNumberTa5d6ff"Tb4b4b4)

Tf0883e@Composable

Tff7b72fun Td2a8ffrememberQrCodePainterTb4b4b4(Te6edf3textTb4b4b4: Tffa657StringTb4b4b4, Te6edf3sizeTb4b4b4: Tffa657Int Tff7b72= T79c0ff5T79c0ff1T79c0ff2Tb4b4b4)Tb4b4b4: Te6edf3Painter Tb4b4b4{

Tff7b72val Te6edf3qrCode Tff7b72=

Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3runtimeTb4b4b4.Te6edf3rememberTb4b4b4(Te6edf3textTb4b4b4) Tb4b4b4{

Te6edf3QRCodeTb4b4b4.Te6edf3ofSquaresTb4b4b4(Tb4b4b4)Tb4b4b4.Te6edf3withErrorCorrectionLevelTb4b4b4(Te6edf3ErrorCorrectionLevelTb4b4b4.Te6edf3HIGHTb4b4b4)Tb4b4b4.Te6edf3buildTb4b4b4(Te6edf3textTb4b4b4)

Tb4b4b4}

Tff7b72val Te6edf3rawMatrix Tff7b72= Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3runtimeTb4b4b4.Te6edf3rememberTb4b4b4(Te6edf3qrCodeTb4b4b4) Tb4b4b4{ Te6edf3qrCodeTb4b4b4.Te6edf3rawData Tb4b4b4}

Tff7b72val Te6edf3matrixSize Tff7b72= Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3runtimeTb4b4b4.Te6edf3rememberTb4b4b4(Te6edf3qrCodeTb4b4b4) Tb4b4b4{ Te6edf3rawMatrixTb4b4b4.Te6edf3size Tb4b4b4}

Tff7b72val Te6edf3quietZone Tff7b72= T79c0ff4 T8b949e// QR standard quiet zone is 4 modules on all sides

Tff7b72val Te6edf3totalModules Tff7b72= Te6edf3matrixSize Tff7b72+ Tb4b4b4(Te6edf3quietZone Tff7b72* T79c0ff2Tb4b4b4)

Tff7b72return Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3runtimeTb4b4b4.Te6edf3rememberTb4b4b4(Te6edf3qrCodeTb4b4b4, Te6edf3sizeTb4b4b4) Tb4b4b4{

Tff7b72val Te6edf3bitmap Tff7b72= Te6edf3ImageBitmapTb4b4b4(Te6edf3sizeTb4b4b4, Te6edf3sizeTb4b4b4)

Tff7b72val Te6edf3canvas Tff7b72= Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3uiTb4b4b4.Te6edf3graphicsTb4b4b4.Te6edf3CanvasTb4b4b4(Te6edf3bitmapTb4b4b4)

Tff7b72val Te6edf3drawScope Tff7b72= Te6edf3CanvasDrawScopeTb4b4b4(Tb4b4b4)

Te6edf3drawScopeTb4b4b4.Te6edf3drawTb4b4b4(

Te6edf3density Tff7b72= Te6edf3DensityTb4b4b4(T79c0ff1fTb4b4b4)Tb4b4b4,

Te6edf3layoutDirection Tff7b72= Te6edf3LayoutDirectionTb4b4b4.Te6edf3LtrTb4b4b4,

Te6edf3canvas Tff7b72= Te6edf3canvasTb4b4b4,

Te6edf3size Tff7b72= Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3uiTb4b4b4.Te6edf3geometryTb4b4b4.Te6edf3SizeTb4b4b4(Te6edf3sizeTb4b4b4.Te6edf3toFloatTb4b4b4(Tb4b4b4)Tb4b4b4, Te6edf3sizeTb4b4b4.Te6edf3toFloatTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4,

Tb4b4b4) Tb4b4b4{

Tff7b72val Te6edf3squareSize Tff7b72= Te6edf3sizeTb4b4b4.Te6edf3toFloatTb4b4b4(Tb4b4b4) Tff7b72/ Te6edf3totalModules

T8b949e// Fill background white

Te6edf3drawRectTb4b4b4(

Te6edf3color Tff7b72= Te6edf3ColorTb4b4b4.Te6edf3WhiteTb4b4b4,

Te6edf3topLeft Tff7b72= Te6edf3OffsetTb4b4b4.Te6edf3ZeroTb4b4b4,

Te6edf3size Tff7b72= Te6edf3androidxTb4b4b4.Te6edf3composeTb4b4b4.Te6edf3uiTb4b4b4.Te6edf3geometryTb4b4b4.Te6edf3SizeTb4b4b4(Te6edf3sizeTb4b4b4.Te6edf3toFloatTb4b4b4(Tb4b4b4)Tb4b4b4, Te6edf3sizeTb4b4b4.Te6edf3toFloatTb4b4b4(Tb4b4b4)Tb4b4b4)Tb4b4b4,

Tb4b4b4)

T8b949e// Draw dark squares

Tff7b72for Tb4b4b4(Te6edf3row Tff7b72in T79c0ff0 Te6edf3until Te6edf3matrixSizeTb4b4b4) Tb4b4b4{

Tff7b72for Tb4b4b4(Te6edf3col Tff7b72in T79c0ff0 Te6edf3until Te6edf3matrixSizeTb4b4b4) Tb4b4b4{

Tff7b72if Tb4b4b4(Te6edf3rawMatrixTff7b72[Te6edf3rowTff7b72]Tff7b72[Te6edf3colTff7b72]Tb4b4b4.Te6edf3darkTb4b4b4) Tb4b4b4{

Te6edf3drawRectTb4b4b4(

Te6edf3color Tff7b72= Te6edf3ColorTb4b4b4.Te6edf3BlackTb4b4b4,

Te6edf3topLeft Tff7b72= Te6edf3OffsetTb4b4b4(Tb4b4b4(Te6edf3col Tff7b72+ Te6edf3quietZoneTb4b4b4) Tff7b72* Te6edf3squareSizeTb4b4b4, Tb4b4b4(Te6edf3row Tff7b72+ Te6edf3quietZoneTb4b4b4) Tff7b72* Te6edf3squareSizeTb4b4b4)Tb4b4b4,

Te6edf3size Tff7b72= Te6edf3SizeTb4b4b4(Te6edf3squareSizeTb4b4b4, Te6edf3squareSizeTb4b4b4)Tb4b4b4,

Tb4b4b4)

Tb4b4b4}

Tb4b4b4}

Tb4b4b4}

Tb4b4b4}

Te6edf3BitmapPainterTb4b4b4(Te6edf3bitmapTb4b4b4)

Tb4b4b4}

Tb4b4b4}