public ExportItem(string caption, SKImage thumbnail, ExportType type)
{
Caption = caption;
using (var data = thumbnail.Encode())
using (var stream = data.AsStream())
{
Thumbnail = Helpers.GetImageSource(stream);
}
Type = type;
}
public static ImageSource GenerateBitmapPopulateImageSource(SKImage skImage)
{
ImageSource ImgSrc = ImageSource.FromStream(() => {
SKData skData = skImage.Encode(SKEncodedImageFormat.Png, 100);
Stream stream = skData.AsStream(true);
return(stream);
});
return(ImgSrc);
}
private void ReturnMomentaryAsJpg(HttpRequest Request, HttpResponse Response)
{
SKImage Gauge = this.GenerateGauge(Request.Header);
SKData Data = Gauge.Encode(SKEncodedImageFormat.Jpeg, 90);
byte[] Binary = Data.ToArray();
Response.ContentType = "image/jpeg";
Response.Write(Binary);
}
public IActionResult ValidateCode()
{
#region 反射SK支持的全部颜色
//List<SKColor> colors = new List<SKColor>();
//var skcolors = new SKColors();
//var type = skcolors.GetType();
//foreach (FieldInfo field in type.GetFields())
//{
// colors.Add( (SKColor)field.GetValue(skcolors));
//}
#endregion
//int maxcolorindex = colors.Count-1;
string text = "1A3V";
var zu = text.ToList();
SKBitmap bmp = new SKBitmap(80, 30);
using (SKCanvas canvas = new SKCanvas(bmp))
{
//背景色
canvas.DrawColor(SKColors.White);
using (SKPaint sKPaint = new SKPaint())
{
sKPaint.TextSize = 16; //字体大小
sKPaint.IsAntialias = true; //开启抗锯齿
sKPaint.Typeface = SKTypeface.FromFamilyName("微软雅黑", SKTypefaceStyle.Bold); //字体
SKRect size = new SKRect();
sKPaint.MeasureText(zu[0].ToString(), ref size); //计算文字宽度以及高度
float temp = (bmp.Width / 4 - size.Size.Width) / 2;
float temp1 = bmp.Height - (bmp.Height - size.Size.Height) / 2;
Random random = new Random();
for (int i = 0; i < 4; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
canvas.DrawText(zu[i].ToString(), temp + 20 * i, temp1, sKPaint);//画文字
}
//干扰线
for (int i = 0; i < 5; i++)
{
sKPaint.Color = new SKColor((byte)random.Next(0, 255), (byte)random.Next(0, 255), (byte)random.Next(0, 255));
canvas.DrawLine(random.Next(0, 40), random.Next(1, 29), random.Next(41, 80), random.Next(1, 29), sKPaint);
}
}
//页面展示图片
using (SKImage img = SKImage.FromBitmap(bmp))
{
using (SKData p = img.Encode())
{
return(File(p.ToArray(), "image/Png"));
}
}
}
}
private static async Task <bool> SaveSKBitmapAsync(SKBitmap sKBitmap, string fullPath)
{
//Save
using SKImage image = SKImage.FromBitmap(sKBitmap);
using SKData data = image.Encode(SKEncodedImageFormat.Png, 100);
fullPath = Path.ChangeExtension(fullPath, ".png");
return(await FileUtil.TrySaveFileAsync(data.ToArray(), fullPath).ConfigureAwait(false));
}
internal ImageSource GetImageResource()
{
SKImage image = SKImage.FromBitmap(bitmap);
// encode the image (defaults to PNG)
SKData encoded = image.Encode();
System.IO.Stream stream = encoded.AsStream();
var source = Xamarin.Forms.ImageSource.FromStream(() => stream);
return(source);
}
/// <summary>
/// Saves the specified stream.
/// </summary>
/// <param name="image">The image.</param>
/// <param name="stream">The stream.</param>
/// <param name="format">The format.</param>
/// <param name="quality">The quality.</param>
/// <exception cref="ArgumentOutOfRangeException">quality</exception>
public static void Save(this SKImage image, Stream stream, SKEncodedImageFormat format = SKEncodedImageFormat.Png, int quality = 100)
{
if (quality < 1 || quality > 100)
{
throw new ArgumentOutOfRangeException(nameof(quality));
}
using (var data = image.Encode(format, quality))
{
data.SaveTo(stream);
}
}
/// <summary>
/// Event thrown when touching the "Valider" button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <returns></returns>
async Task OnValidateButtonClickedAsync(object sender, EventArgs e)
{
if (entryName.Text == null || entryName.Text.Equals(""))
{
await DisplayAlert("Erreur", "Le nom du signataire ne doit pas être vide", "OK");
return;
}
SKImageInfo info = new SKImageInfo(widthExport, heightExport);
var surface = SKSurface.Create(info);
var canvas = surface.Canvas;
foreach (SKPath path in completedPathsResize)
{
canvas.DrawPath(path, paint);
}
foreach (SKPath path in inProgressPathsResize.Values)
{
canvas.DrawPath(path, paint);
}
SKImage snap = surface.Snapshot();
data = snap.Encode();
Eval.IsSigned = true;
CurrentCandidate.IsSigned = true;
Eval.Signatures.Add(new Signature(entryName.Text, data.ToArray()));
bool answer = await DisplayAlert("Signature", "Voulez-vous effectuer une autre signature ?", "Oui", "Non");
if (!answer)
{
await Navigation.PopAsync();
}
else
{
data = null;
if (canvasSaved != null)
{
canvasSaved = null;
}
canvasView.InvalidateSurface();
completedPaths.Clear();
inProgressPaths.Clear();
completedPathsResize.Clear();
inProgressPathsResize.Clear();
entryName.Text = "";
}
}
/// <summary>
/// Converts a UIImage to a Base64 string, using minimal suppression via JPEG conversion
/// <param name="image">The image being converted.</param>
/// </summary>
public static string SKImageToBase64(SKImage image)
{
if (image == null)
{
throw new ArgumentNullException();
}
var data = image.Encode(SharedConstants.EncodingFormat, SharedConstants.EncodingQuality).ToArray();
return(Convert.ToBase64String(data));
}
public void SaveImage()
{
SKImage bitmapImage = SKImage.FromBitmap(myApp.myPage.secondPage.drawing.bitmap);
var jpgImage = bitmapImage.Encode(SKEncodedImageFormat.Jpeg, 90);
var bytes = jpgImage.ToArray();
var thisthing = Foundation.NSData.FromArray(bytes);
var imageToSave = UIImage.LoadFromData(thisthing);
imageToSave.SaveToPhotosAlbum((image, error) => {
Console.WriteLine("Error");
});
}
public IImage ImageData()
{
var image = new BackgroundImage();
if (_snapShot != null)
{
image.Data = _snapShot.Encode(SKImageEncodeFormat.Jpeg, 100).ToArray();
image.Width = _snapShot.Width;
image.Height = _snapShot.Height;
}
return(image);
}
public ProcessImage PngToJpeg(ProcessImage source)
{
if (source.Type != ProcessImageType.PNG)
{
throw new FormatException("Process image should be Png");
}
SKImage tmp = SKImage.FromBitmap(SKBitmap.Decode(source.Load));
return(new ProcessImage {
Load = tmp.Encode(SKEncodedImageFormat.Jpeg, 95).ToArray(), Type = ProcessImageType.JPEG, Width = tmp.Width, Height = tmp.Height
});
}
public static Image GetImageFromBitmap(SKBitmap bitmap)
{
Image img = new Image();
SKImage image = SKImage.FromPixels(bitmap.PeekPixels());
SKData encoded = image.Encode();
Stream stream = encoded.AsStream();
img.Source = ImageSource.FromStream(() => stream);
return(img);
}
private void Save(SKImage Image, string FileName)
{
if (!Directory.Exists("Graphs"))
{
Directory.CreateDirectory("Graphs");
}
using (SKData Data = Image.Encode(SKEncodedImageFormat.Png, 100))
{
File.WriteAllBytes(Path.Combine("Graphs", FileName), Data.ToArray());
}
}
public static void SaveBitmap(SKBitmap bitmap, string filename)
{
// Make sure the directories exist
Directory.CreateDirectory(Path.GetDirectoryName(filename));
using (SKImage image = SKImage.FromBitmap(bitmap))
using (SKData data = image.Encode(SKImageEncodeFormat.Png, 100))
using (Stream stream = File.OpenWrite(filename))
{
data.SaveTo(stream);
}
}
public void Missisippi_Skia(int offset)
{
string jsonContent = File.ReadAllText(TestFile.GetInputFileFullPath(TestImages.GeoJson.States));
FeatureCollection features = JsonConvert.DeserializeObject <FeatureCollection>(jsonContent);
Feature missisipiGeom = features.Features.Single(f => (string)f.Properties["NAME"] == "Mississippi");
Matrix3x2 transform = Matrix3x2.CreateTranslation(-87, -54)
* Matrix3x2.CreateScale(60, 60)
* Matrix3x2.CreateTranslation(offset, offset);
IReadOnlyList <PointF[]> points = PolygonFactory.GetGeoJsonPoints(missisipiGeom, transform);
var path = new SKPath();
foreach (PointF[] pts in points.Where(p => p.Length > 2))
{
path.MoveTo(pts[0].X, pts[0].Y);
for (int i = 0; i < pts.Length; i++)
{
path.LineTo(pts[i].X, pts[i].Y);
}
path.LineTo(pts[0].X, pts[0].Y);
}
var imageInfo = new SKImageInfo(10000, 10000);
using var paint = new SKPaint
{
Style = SKPaintStyle.Stroke,
Color = SKColors.White,
StrokeWidth = 1f,
IsAntialias = true,
};
using var surface = SKSurface.Create(imageInfo);
SKCanvas canvas = surface.Canvas;
canvas.Clear(new SKColor(0, 0, 0));
canvas.DrawPath(path, paint);
string outDir = TestEnvironment.CreateOutputDirectory("Skia");
string fn = System.IO.Path.Combine(outDir, $"Missisippi_Skia_{offset}.png");
using SKImage image = surface.Snapshot();
using SKData data = image.Encode(SKEncodedImageFormat.Png, 100);
using FileStream fs = File.Create(fn);
data.SaveTo(fs);
}
/// <summary>
/// Save an image to a file
/// </summary>
/// <param name="image">The image to save</param>
/// <param name="fileName">The path to the output file</param>
/// <param name="format">The image format for encoding (default: Png)</param>
/// <param name="quality">Quality level for the image; between 0 and 100 (default: 100)</param>
public static void SaveToFile(this SKImage image, string fileName,
SKEncodedImageFormat format = SKEncodedImageFormat.Png, int quality = 100)
{
// Ensure the output path exists
string fullPath = Path.GetFullPath(fileName);
Directory.CreateDirectory(Path.GetDirectoryName(fullPath));
// Actually save to the file
using (var stream = File.Create(fullPath))
using (var data = image.Encode(format, quality))
data.SaveTo(stream);
}
public byte[] Resize(
MemoryStream fileContents,
int maxWidth,
int maxHeight)
{
using SKBitmap sourceBitmap = SKBitmap.Decode(fileContents);
using SKBitmap scaledBitmap = sourceBitmap.Resize(new SKImageInfo(maxWidth, maxHeight), SKFilterQuality.Medium);
using SKImage scaledImage = SKImage.FromBitmap(scaledBitmap);
using SKData data = scaledImage.Encode();
return(data.ToArray());
}
public ImageSource GetImageSource()
{
if (snapshot == null)
{
return(null);
}
//var image = SkiaSharp.SKImage.FromBitmap(bitmap);
var encoded = snapshot.Encode();
var stream = encoded.AsStream();
var source = ImageSource.FromStream(() => stream);
return(source);
}
/// <inheritdocs />
public Task RenderAsync(ITextData textData, Stream outputStream)
{
Debug.Assert(textData != null);
Debug.Assert(outputStream != null);
using (SKBitmap bitmap = GenerateBitmap(textData))
using (SKImage image = SKImage.FromBitmap(bitmap))
{
image.Encode().SaveTo(outputStream);
}
return(Task.CompletedTask);
}
public static BitmapImage bitmapImageFromSKImage(SKImage image)
{
using var encoded = image.Encode();
using var stream = encoded.AsStream();
BitmapImage photo = new BitmapImage();
photo.BeginInit();
photo.CacheOption = BitmapCacheOption.OnLoad;
photo.StreamSource = stream;
photo.EndInit();
photo.Freeze();
return(photo);
}
public byte[] GetImageBytes()
{
if (_image != null)
{
var encodedData = _image.Encode(SKEncodedImageFormat.Jpeg, Quality);
return(encodedData.ToArray());
}
var data = SKImage.FromBitmap(_bitmap).Encode(SKEncodedImageFormat.Jpeg, Quality);
return(data.ToArray());
}
public void initialize(string argument)
{
this.Size = new Size(500, 500);
this.StartPosition = FormStartPosition.CenterScreen;
this.MaximumSize = new Size(500, 500);
this.MinimumSize = new Size(500, 500);
try
{
image_info = new SKImageInfo(width, height);
surface = SKSurface.Create(image_info);
canvas = surface.Canvas;
canvas.Clear(SKColors.White);
coordinates_lines_paint = new SKPaint();
coordinates_lines_paint.Color = SKColor.Parse("#d55e00");
coordinates_lines_paint.IsAntialias = true;
coordinates_lines_paint.StrokeWidth = 1;
coordinates_lines_paint.Style = SKPaintStyle.Stroke;
graph_paint = new SKPaint();
graph_paint.Color = SKColors.Black;
graph_paint.IsAntialias = true;
graph_paint.StrokeWidth = 1;
graph_paint.Style = SKPaintStyle.Stroke;
//points = get_points(-198, height);
coordinates_lines = new SKPath();
graph = new SKPath();
points = coordinates();
graph_coordinates_lines();
graph_lines(points);
canvas.DrawPath(coordinates_lines, coordinates_lines_paint);
canvas.DrawPath(graph, graph_paint);
image = surface.Snapshot();
data = image.Encode(SKEncodedImageFormat.Png, 500);
memory_stream = new MemoryStream(data.ToArray());
bitmap = new Bitmap(memory_stream, false);
this.BackgroundImage = bitmap;
this.BackgroundImageLayout = ImageLayout.None;
delete_data();
}
catch (System.Exception error)
{
Console.WriteLine("" + error);
}
}
private async Task <byte[]> CreateMapImageAsync(
int width,
int height,
Models.Bounds boundingBox,
string mediaType,
bool isTransparent,
uint backgroundColor,
IList <string> layerNames)
{
var imageInfo = new SKImageInfo(
width: width,
height: height,
colorType: SKColorType.Rgba8888,
alphaType: SKAlphaType.Premul);
using var surface = SKSurface.Create(imageInfo);
using var canvas = surface.Canvas;
canvas.Clear(new SKColor(backgroundColor));
foreach (var layerName in layerNames)
{
if (this.tileSourceFabric.Contains(layerName))
{
await WmsHelper.DrawLayerAsync( // TODO: ? pass required format to avoid conversions
this.tileSourceFabric.Get(layerName),
width,
height,
boundingBox,
canvas,
isTransparent,
backgroundColor);
}
}
using SKImage image = surface.Snapshot();
if (String.Compare(mediaType, MediaTypeNames.Image.Tiff, StringComparison.OrdinalIgnoreCase) == 0)
{
using var bitmap = SKBitmap.FromImage(image);
// TODO: improve performance of pixels processing, maybe using unsafe/pointers
var pixels = bitmap.Pixels.SelectMany(p => new byte[] { p.Red, p.Green, p.Blue, p.Alpha }).ToArray();
var tiff = ImageHelper.CreateTiffImage(pixels, image.Width, image.Height);
return(tiff);
}
else
{
var imageFormat = U.ImageHelper.SKEncodedImageFormatFromMediaType(mediaType);
using SKData data = image.Encode(imageFormat, 90); // TODO: ? quality parameter
return(data.ToArray());
}
}
//
//
// BEGIN IMAGE PROCESSING HELPERS
// BEGIN IMAGE PROCESSING HELPERS
// BEGIN IMAGE PROCESSING HELPERS
//
//
/// <summary>
/// Convenience method for converting a given SKImage to a Xamarin Image UI Component.
/// </summary>
/// <param name="inImg">A valid SKImage</param>
/// <returns>A Xamarin.Forms.Image object based on the passed in SKImage</returns>
public static Image SKImageToXamarinImage(SKImage inImg)
{
// yes, there should be a way to do this without the multiple back and forth to bytes.
// no, it's not worth my time to try and figure it out.
var data = inImg.Encode(SKEncodedImageFormat.Jpeg, 100);
MemoryStream ms = new MemoryStream();
data.SaveTo(ms);
var bytes = ms.ToArray();
Image outImage = new Image();
outImage.Source = ImageSource.FromStream(() => new MemoryStream(bytes));
return(outImage);
}
public static byte[] CambiarTamanio(string fileContents, int maxWidth, int maxHeight)
{
using FileStream ms = new FileStream(fileContents, FileMode.Open);
using SKBitmap sourceBitmap = SKBitmap.Decode(ms);
int height = Math.Min(maxHeight, sourceBitmap.Height);
int width = Math.Min(maxWidth, sourceBitmap.Width);
using SKBitmap scaledBitmap = sourceBitmap.Resize(new SKImageInfo(width, height), SKFilterQuality.High);
using SKImage scaledImage = SKImage.FromBitmap(scaledBitmap);
using SKData data = scaledImage.Encode();
return(data.ToArray());
}
public MemoryStream SourceStream()
{
SKImage image = SKImage.FromBitmap(SourceImage);
SKData encoded = image.Encode();
var memoryStream = new MemoryStream();
encoded.AsStream().CopyTo(memoryStream);
memoryStream.Seek(0, SeekOrigin.Begin);
#if LOG_DEBUG
SDV_Logger.LogInfo("SourceStream", $"Stream length: {memoryStream.Length}");
#endif
return(memoryStream);
}
public static void SaveImage(Image img, string path)
{
if (img == null || path == null)
{
return;
}
SKImage image = SKImage.FromBitmap(img);
SKData png = image.Encode(SKEncodedImageFormat.Png, 100);
using (var filestream = File.OpenWrite(path))
{
png.SaveTo(filestream);
}
}
public static byte[] SquareImage(byte[] imgBytes)
{
// my passed in imgBytes are a jpg, not a bmp.
//SKBitmap bmp = GlobalSingletonHelpers.SKBitmapFromBytes(imgBytes);
SKBitmap bmp = buildFixedRotationSKBitmapFromBytes(imgBytes);
SKImage res = SKImage.FromBitmap(CropImage(bmp));
return(res.Encode(SKEncodedImageFormat.Jpeg, 100).ToArray());
// testing
//byte[] test = res.Encode(SKEncodedImageFormat.Jpeg, 100).ToArray();
//SKBitmap res3 = SKBitmapFromBytes(test2);
//return test;
}
public static byte[] CreateByteByImgVerifyCode(string verifyCode, int width, int height)
{
byte[] bytes;
var text = verifyCode.ToUpper().ToList();
SKBitmap bmp = new SKBitmap(width, height);
using (SKCanvas canvas = new SKCanvas(bmp))
{
// 背景色
canvas.DrawColor(SKColors.White);
using (SKPaint sKPaint = new SKPaint())
{
sKPaint.TextSize = 18; // 字体大小
sKPaint.FakeBoldText = true;
sKPaint.IsAntialias = true; // 开启抗锯齿
sKPaint.Typeface = SKTypeface.FromFamilyName("WenQuanYi Micro Hei", SKTypefaceStyle.Normal); //字体
SKRect size = new SKRect();
sKPaint.MeasureText(text[0].ToString(), ref size); // 计算文字宽度以及高度
float _x = (width - size.Width * text.Count) / 2 - size.Width;
float _y = size.Height;
int num = Next(0, 9);
sKPaint.Color = colors[num];
// 干扰线
for (int i = 0; i < 3; i++)
{
canvas.DrawLine(Next(0, 40), Next(1, 29), Next(41, 80), Next(1, 29), sKPaint);
}
// 文字
for (int i = 0; i < text.Count; i++)
{
_x += size.Width + Next(0, 3);
_y = size.Height + Next(5, 15);
canvas.DrawText(text[i].ToString(), _x, _y, sKPaint); // 画文字
}
}
// 页面展示图片
using (SKImage img = SKImage.FromBitmap(bmp))
{
using (SKData p = img.Encode())
{
bytes = p.ToArray();
}
}
}
return(bytes);
}
