Demo for SkiaSharp

Demo-SkiaSharp/Demo-SkiaSharp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RootNamespace>Net.Codecrete.QrCodeGenerator.Demo</RootNamespace>
+    <PackageId>Net.Codecrete.QrCodeGenerator.Demo</PackageId>
+    <Version>1.6.1</Version>
+    <Authors>Manuel Bleichenbacher, Project Nayuki</Authors>
+    <Product>QR Code Generator for .NET</Product>
+    <Description>Demo application for QR Code Generation</Description>
+    <Copyright>Copyright Manuel Bleichenbacher and Project Nayuki (MIT License)</Copyright>
+    <PackageLicenseUrl>https://opensource.org/licenses/MIT</PackageLicenseUrl>
+    <PackageProjectUrl>https://github.com/manuelbl/QrCodeGenerator</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/manuelbl/QrCodeGenerator</RepositoryUrl>
+    <Company>Codecrete</Company>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Net.Codecrete.QrCodeGenerator" Version="2.0.0" />
+    <PackageReference Include="SkiaSharp" Version="2.80.3" />
+  </ItemGroup>
+
+</Project>

Demo-SkiaSharp/Demo-SkiaSharp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.30611.23
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Demo-SkiaSharp", "Demo-SkiaSharp.csproj", "{BBB1A4A6-D82E-4233-8FC9-9300F9576FD2}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BBB1A4A6-D82E-4233-8FC9-9300F9576FD2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BBB1A4A6-D82E-4233-8FC9-9300F9576FD2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BBB1A4A6-D82E-4233-8FC9-9300F9576FD2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BBB1A4A6-D82E-4233-8FC9-9300F9576FD2}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {94BC47F9-3AE8-471A-AC3F-CDEFA1B21089}
+	EndGlobalSection
+EndGlobal

Demo-SkiaSharp/Program.cs

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+/* 
+ * QR code generator library (.NET)
+ *
+ * Copyright (c) Manuel Bleichenbacher (MIT License)
+ * https://github.com/manuelbl/QrCodeGenerator
+ * Copyright (c) Project Nayuki (MIT License)
+ * https://www.nayuki.io/page/qr-code-generator-library
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace Net.Codecrete.QrCodeGenerator.Demo
+{
+    internal class Program
+    {
+        // The main application program.
+        internal static void Main()
+        {
+            DoBasicDemo();
+            DoVarietyDemo();
+            DoSegmentDemo();
+            DoMaskDemo();
+        }
+
+
+        #region Demo suite
+
+        // Creates a single QR code, then writes it to a PNG file and an SVG file.
+        private static void DoBasicDemo()
+        {
+            const string text = "Hello, world!"; // User-supplied Unicode text
+            var errCorLvl = QrCode.Ecc.Low; // Error correction level
+
+            var qr = QrCode.EncodeText(text, errCorLvl); // Make the QR code symbol
+            qr.SaveAsPng("hello-world-QR.png", 10, 4);
+
+            string svg = qr.ToSvgString(4); // Convert to SVG XML code
+            File.WriteAllText("hello-world-QR.svg", svg, Encoding.UTF8); // Write image to file
+        }
+
+
+        // Creates a variety of QR codes that exercise different features of the library, and writes each one to file.
+        private static void DoVarietyDemo()
+        {
+            // Numeric mode encoding (3.33 bits per digit)
+            var qr = QrCode.EncodeText("314159265358979323846264338327950288419716939937510", QrCode.Ecc.Medium);
+            qr.SaveAsPng("pi-digits-QR.png", 13, 1);
+
+            // Alphanumeric mode encoding (5.5 bits per character)
+            qr = QrCode.EncodeText("DOLLAR-AMOUNT:$39.87 PERCENTAGE:100.00% OPERATIONS:+-*/", QrCode.Ecc.High);
+            qr.SaveAsPng("alphanumeric-QR.png", 10, 2);
+
+            // Unicode text as UTF-8
+            qr = QrCode.EncodeText("こんにちwa、世界！ αβγδ", QrCode.Ecc.Quartile);
+            qr.SaveAsPng("unicode-QR.png", 10, 3);
+
+            // Moderately large QR code using longer text (from Lewis Carroll's Alice in Wonderland)
+            qr = QrCode.EncodeText(
+                "Alice was beginning to get very tired of sitting by her sister on the bank, "
+                + "and of having nothing to do: once or twice she had peeped into the book her sister was reading, "
+                + "but it had no pictures or conversations in it, 'and what is the use of a book,' thought Alice "
+                + "'without pictures or conversations?' So she was considering in her own mind (as well as she could, "
+                + "for the hot day made her feel very sleepy and stupid), whether the pleasure of making a "
+                + "daisy-chain would be worth the trouble of getting up and picking the daisies, when suddenly "
+                + "a White Rabbit with pink eyes ran close by her.", QrCode.Ecc.High);
+            qr.SaveAsPng("alice-wonderland-QR.png", 6, 10);
+        }
+
+
+        // Creates QR codes with manually specified segments for better compactness.
+        private static void DoSegmentDemo()
+        {
+            // Illustration "silver"
+            const string silver0 = "THE SQUARE ROOT OF 2 IS 1.";
+            const string silver1 = "41421356237309504880168872420969807856967187537694807317667973799";
+            var qr = QrCode.EncodeText(silver0 + silver1, QrCode.Ecc.Low);
+            qr.SaveAsPng("sqrt2-monolithic-QR.png", 10, 3);
+
+            var segs = new List<QrSegment>
+            {
+                QrSegment.MakeAlphanumeric(silver0),
+                QrSegment.MakeNumeric(silver1)
+            };
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Low);
+            qr.SaveAsPng("sqrt2-segmented-QR.png", 10, 3);
+
+            // Illustration "golden"
+            const string golden0 = "Golden ratio φ = 1.";
+            const string golden1 =
+                "6180339887498948482045868343656381177203091798057628621354486227052604628189024497072072041893911374";
+            const string golden2 = "......";
+            qr = QrCode.EncodeText(golden0 + golden1 + golden2, QrCode.Ecc.Low);
+            qr.SaveAsPng("phi-monolithic-QR.png", 8, 5);
+
+            segs = new List<QrSegment>
+            {
+                QrSegment.MakeBytes(Encoding.UTF8.GetBytes(golden0)),
+                QrSegment.MakeNumeric(golden1),
+                QrSegment.MakeAlphanumeric(golden2)
+            };
+
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Low);
+            qr.SaveAsPng("phi-segmented-QR.png", 8, 5);
+
+            // Illustration "Madoka": kanji, kana, Cyrillic, full-width Latin, Greek characters
+            const string madoka = "「魔法少女まどか☆マギカ」って、　ИАИ　ｄｅｓｕ　κα？";
+            qr = QrCode.EncodeText(madoka, QrCode.Ecc.Low);
+            qr.SaveAsPng("madoka-utf8-QR.png", 9, 4);
+
+            segs = new List<QrSegment> { QrSegmentAdvanced.MakeKanji(madoka) };
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Low);
+            qr.SaveAsPng("madoka-kanji-QR.png", 9, 4);
+        }
+
+
+        // Creates QR codes with the same size and contents but different mask patterns.
+        private static void DoMaskDemo()
+        {
+            // Project Nayuki URL
+            var segs = QrSegment.MakeSegments("https://www.nayuki.io/");
+            var qr = QrCode.EncodeSegments(segs, QrCode.Ecc.High);
+            qr.SaveAsPng("project-nayuki-automask-QR.png", 8, 6);
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.High, QrCode.MinVersion, QrCode.MaxVersion, 3);  // Force mask 3
+            qr.SaveAsPng("project-nayuki-mask3-QR.png", 8, 6);
+
+            // Chinese text as UTF-8
+            segs = QrSegment.MakeSegments("維基百科（Wikipedia，聆聽i/ˌwɪkᵻˈpiːdi.ə/）是一個自由內容、公開編輯且多語言的網路百科全書協作計畫");
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Medium, QrCode.MinVersion, QrCode.MaxVersion, 0);  // Force mask 0
+            qr.SaveAsPng("unicode-mask0-QR.png", 10, 3);
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Medium, QrCode.MinVersion, QrCode.MaxVersion, 1);  // Force mask 1
+            qr.SaveAsPng("unicode-mask1-QR.png", 10, 3);
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Medium, QrCode.MinVersion, QrCode.MaxVersion, 5);  // Force mask 5
+            qr.SaveAsPng("unicode-mask5-QR.png", 10, 3);
+            qr = QrCode.EncodeSegments(segs, QrCode.Ecc.Medium, QrCode.MinVersion, QrCode.MaxVersion, 7);  // Force mask 7
+            qr.SaveAsPng("unicode-mask7-QR.png", 10, 3);
+        }
+
+        #endregion
+
+    }
+}

Demo-SkiaSharp/QrCodeBitmapExtensions.cs

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+/* 
+ * QR code generator library (.NET)
+ *
+ * Copyright (c) Manuel Bleichenbacher (MIT License)
+ * https://github.com/manuelbl/QrCodeGenerator
+ *
+ */
+
+using SkiaSharp;
+using System;
+using System.IO;
+
+namespace Net.Codecrete.QrCodeGenerator
+{
+    public static class QrCodeBitmapExtensions
+    {
+        /// <inheritdoc cref="ToBitmap(QrCode, int, int)"/>
+        /// <param name="background">The background color.</param>
+        /// <param name="foreground">The foreground color.</param>
+        public static SKBitmap ToBitmap(this QrCode qrCode, int scale, int border, SKColor foreground, SKColor background)
+        {
+            // check arguments
+            if (scale <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(scale), "Value out of range");
+            }
+            if (border < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(border), "Value out of range");
+            }
+
+            int size = qrCode.Size;
+            int dim = (size + border * 2) * scale;
+
+            if (dim > short.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException(nameof(scale), "Scale or border too large");
+            }
+
+            // create bitmap
+            SKBitmap bitmap = new SKBitmap(dim, dim, SKColorType.Rgb888x, SKAlphaType.Opaque);
+
+            using (SKCanvas canvas = new SKCanvas(bitmap))
+            {
+                // draw background
+                using (SKPaint paint = new SKPaint { Color = background })
+                {
+                    canvas.DrawRect(0, 0, dim, dim, paint);
+                }
+
+                // draw modules
+                using (SKPaint paint = new SKPaint { Color = foreground })
+                {
+                    for (int y = 0; y < size; y++)
+                    {
+                        for (int x = 0; x < size; x++)
+                        {
+                            if (qrCode.GetModule(x, y))
+                            {
+                                canvas.DrawRect((x + border) * scale, (y + border) * scale, scale, scale, paint);
+                            }
+                        }
+                    }
+                }
+            }
+
+            return bitmap;
+        }
+
+        /// <summary>
+        /// Creates a bitmap (raster image) of this QR code.
+        /// <para>
+        /// The <paramref name="scale"/> parameter specifies the scale of the image, which is
+        /// equivalent to the width and height of each QR code module. Additionally, the number
+        /// of modules to add as a border to all four sides can be specified.
+        /// </para>
+        /// <para>
+        /// For example, <c>ToBitmap(scale: 10, border: 4)</c> means to pad the QR code with 4 white
+        /// border modules on all four sides, and use 10&#xD7;10 pixels to represent each module.
+        /// </para>
+        /// <para>
+        /// The resulting bitmap uses the pixel format <see cref="PixelFormat.Format24bppRgb"/>.
+        /// If not specified, the foreground color is black (0x000000) und the background color always white (0xFFFFFF).
+        /// </para>
+        /// </summary>
+        /// <param name="scale">The width and height, in pixels, of each module.</param>
+        /// <param name="border">The number of border modules to add to each of the four sides.</param>
+        /// <returns>The created bitmap representing this QR code.</returns>
+        /// <exception cref="ArgumentOutOfRangeException"><paramref name="scale"/> is 0 or negative, <paramref name="border"/> is negative
+        /// or the resulting image is wider than 32,768 pixels.</exception>
+        public static SKBitmap ToBitmap(this QrCode qrCode, int scale, int border)
+        {
+            return qrCode.ToBitmap(scale, border, SKColors.Black, SKColors.White);
+        }
+
+        /// <inheritdoc cref="ToPng(QrCode, int, int)"/>
+        /// <param name="background">The background color.</param>
+        /// <param name="foreground">The foreground color.</param>
+        public static byte[] ToPng(this QrCode qrCode, int scale, int border, SKColor foreground, SKColor background)
+        {
+            using SKBitmap bitmap = qrCode.ToBitmap(scale, border, foreground, background);
+            using SKData data = bitmap.Encode(SKEncodedImageFormat.Png, 90);
+            return data.ToArray();
+        }
+
+        /// <summary>
+        /// Creates a PNG image of this QR code and returns it as a byte array.
+        /// <para>
+        /// The <paramref name="scale"/> parameter specifies the scale of the image, which is
+        /// equivalent to the width and height of each QR code module. Additionally, the number
+        /// of modules to add as a border to all four sides can be specified.
+        /// </para>
+        /// <para>
+        /// For example, <c>ToPng(scale: 10, border: 4)</c> means to pad the QR code with 4 white
+        /// border modules on all four sides, and use 10&#xD7;10 pixels to represent each module.
+        /// </para>
+        /// <para>
+        /// If not specified, the foreground color is black (0x000000) und the background color always white (0xFFFFFF).
+        /// </para>
+        /// </summary>
+        /// <param name="scale">The width and height, in pixels, of each module.</param>
+        /// <param name="border">The number of border modules to add to each of the four sides.</param>
+        /// <returns>The created bitmap representing this QR code.</returns>
+        /// <exception cref="ArgumentOutOfRangeException"><paramref name="scale"/> is 0 or negative, <paramref name="border"/> is negative
+        /// or the resulting image is wider than 32,768 pixels.</exception>
+        public static byte[] ToPng(this QrCode qrCode, int scale, int border)
+        {
+            return qrCode.ToPng(scale, border, SKColors.Black, SKColors.White);
+        }
+
+        /// <inheritdoc cref="SaveAsPng(QrCode, string, int, int)"/>
+        /// <param name="background">The background color.</param>
+        /// <param name="foreground">The foreground color.</param>
+        public static void SaveAsPng(this QrCode qrCode, string filename, int scale, int border, SKColor foreground, SKColor background)
+        {
+            using SKBitmap bitmap = qrCode.ToBitmap(scale, border, foreground, background);
+            using SKData data = bitmap.Encode(SKEncodedImageFormat.Png, 90);
+            using FileStream stream = File.OpenWrite(filename);
+            data.SaveTo(stream);
+        }
+
+        /// <summary>
+        /// Saves this QR code as a PNG file.
+        /// <para>
+        /// The <paramref name="scale"/> parameter specifies the scale of the image, which is
+        /// equivalent to the width and height of each QR code module. Additionally, the number
+        /// of modules to add as a border to all four sides can be specified.
+        /// </para>
+        /// <para>
+        /// For example, <c>SaveAsPng("qrcode.png", scale: 10, border: 4)</c> means to pad the QR code with 4 white
+        /// border modules on all four sides, and use 10&#xD7;10 pixels to represent each module.
+        /// </para>
+        /// <para>
+        /// If not specified, the foreground color is black (0x000000) und the background color always white (0xFFFFFF).
+        /// </para>
+        /// </summary>
+        /// <param name="scale">The width and height, in pixels, of each module.</param>
+        /// <param name="border">The number of border modules to add to each of the four sides.</param>
+        /// <exception cref="ArgumentOutOfRangeException"><paramref name="scale"/> is 0 or negative, <paramref name="border"/> is negative
+        /// or the resulting image is wider than 32,768 pixels.</exception>
+        public static void SaveAsPng(this QrCode qrCode, string filename, int scale, int border)
+        {
+            qrCode.SaveAsPng(filename, scale, border, SKColors.Black, SKColors.White);
+        }
+    }
+}