/// <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>
/// Crop a file
/// </summary>
/// <param name="source"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="dest"></param>
/// <returns></returns>
public Task CropImage(FileInfo source, int x, int y, int width, int height, Stream destStream)
{
Stopwatch watch = new Stopwatch("SkiaSharpCrop");
try
{
using SKBitmap sourceBitmap = SKBitmap.Decode(source.FullName);
// setup crop rect
var cropRect = new SKRectI(x, y, x + width, y + height);
var cropped = Crop(sourceBitmap, cropRect);
using SKData data = cropped.Encode(SKEncodedImageFormat.Jpeg, 90);
data.SaveTo(destStream);
}
catch (Exception ex)
{
Logging.LogError($"Exception during Skia Crop processing: {ex.Message}");
throw;
}
finally
{
watch.Stop();
}
return(Task.CompletedTask);
}
static void TestDrawUnderline(string text, float fontSize, TextFormatFlags flags)
{
var font = new Font(Typeface, fontSize, FontStyle.Underline);
var fileName = CleanFileName($"underline-{text}-{fontSize}-{flags}.png");
foreach (char c in System.IO.Path.GetInvalidFileNameChars())
{
fileName = fileName.Replace(c, '_');
}
var size = TextRendererSk.MeasureText(text, font, 0, flags);
var BackColour = SKColors.Black;
using (SKBitmap bitmap = new SKBitmap((int)size.Width, (int)size.Height, SKColorType.Rgba8888, SKAlphaType.Unpremul))
using (var canvas = new SKCanvas(bitmap))
{
canvas.Clear(BackColour);
TextRendererSk.DrawText(canvas, text, font, SKRect.Create(0, -1, size.Width, size.Height), SKColors.White, flags);
using (Stream s = File.Open(fileName, FileMode.Create))
{
SKData d = SKImage.FromBitmap(bitmap).Encode(SKEncodedImageFormat.Png, 100);
d.SaveTo(s);
}
}
Console.WriteLine("Drawing Underline {0} (fontSize {1}, flags {2}), measured size: {3}", text, fontSize, flags, size);
}
public async Task <bool> SaveSnapshot(Stream outputFilestream, int thumbnailSize = -1)
{
ClearComponent();
if (_thumbnailData != null)
{
_thumbnailData.Dispose();
_thumbnailData = null;
}
_thumbnailSize = thumbnailSize;
_saveSurface = true;
thumbnailCompletion = new TaskCompletionSource <bool>();
_canvas.InvokeInvalidate();
// wait for the canvas to draw itself. thumbnail bitmap needs to be set during the draw portion
await thumbnailCompletion.Task;
bool result = true;
try
{
_thumbnailData.SaveTo(outputFilestream);
_thumbnailData.Dispose();
_thumbnailData = null;
}
catch (Exception)
{
result = false;
}
return(result);
}
async Task GenerateFunction(int lut_size)
{
SKData data = new SKData();
//Task.Run(() => {
var image = Hald.GenerateClutImage(lut_size);
SKImage img = SKImage.FromBitmap(image);
data = img.Encode(SKImageEncodeFormat.Png, 90);
// });
SaveFileDialog savefile = new SaveFileDialog();
savefile.FileName = string.Format("identity_{0}.png", lut_size);
savefile.Filter = "PNG files (*.png)|*.png";
if (savefile.ShowDialog() == true)
{
using (FileStream fs = new FileStream(savefile.FileName, FileMode.Create))
{
data.SaveTo(fs);
}
}
EndAnimate();
}
public static void SaveToFile(this SKImage bitmap, String sFileName)
{
SKEncodedImageFormat imageFormat = SKEncodedImageFormat.Png;
int quality = (int)100;
using (MemoryStream memStream = new MemoryStream())
{
SKData skd = bitmap.Encode(imageFormat, quality);
skd.SaveTo(memStream);
byte[] data = memStream.ToArray();
if (data == null)
{
return;
}
else if (data.Length == 0)
{
return;
}
else
{
using (StreamWriter sw = new StreamWriter(new FileStream(sFileName, FileMode.Create)))
{
sw.Write(data);
}
}
}
}
public async Task <string> GetStitchedBitmapSource(int playlistId, int width = 300, bool asThumbnail = false)
{
if (playlistId > 0)
{
string fileName = $"{playlistId}_{width}.{ImageExtension}";
if (!_storageService.TryToGetImagePath(fileName, out string fullName))
{
int height = width;
ObservableCollection <Guid> albumIds = await GetImageIds(playlistId);
SKImage stitchedImage = await Combine(albumIds, width, height, asThumbnail);
using (SKData encoded = stitchedImage.Encode(SKEncodedImageFormat.Png, 100))
{
using (System.IO.Stream outFile = System.IO.File.OpenWrite(fullName))
{
encoded.SaveTo(outFile);
}
}
}
return(fullName);
}
return(null);
}
static void Main(string[] args)
{
Random rand = new Random();
// set up the image
SKImageInfo imageInfo = new SKImageInfo(800, 600, SKColorType.Rgb888x, SKAlphaType.Premul);
SKSurface surface = SKSurface.Create(imageInfo);
SKCanvas canvas = surface.Canvas;
// draw some lines
canvas.Clear(SKColor.Parse("#003366"));
var paint = new SKPaint
{
Color = new SKColor(255, 255, 255, 123),
IsAntialias = true
};
for (int i = 0; i < 1000; i++)
{
SKPoint ptA = new SKPoint(rand.Next(imageInfo.Width), rand.Next(imageInfo.Height));
SKPoint ptB = new SKPoint(rand.Next(imageInfo.Width), rand.Next(imageInfo.Height));
canvas.DrawLine(ptA, ptB, paint);
}
// save the output
string filename = System.IO.Path.GetFullPath("test.png");
System.IO.Stream fileStream = System.IO.File.OpenWrite(filename);
SKImage snap = surface.Snapshot();
SKData encoded = snap.Encode(SKEncodedImageFormat.Png, 100);
encoded.SaveTo(fileStream);
Console.WriteLine($"Saved: {filename}");
}
static void TestDrawSelectionMultiline(string text, float fontSize, TextFormatFlags flags, TextPaintOptions options)
{
var font = new Font(Typeface, fontSize);
var fileName = CleanFileName($"DrawSelectionMultiline-start({options.SelectionStart})-end({options.SelectionEnd})-{text}-{fontSize}-{flags}.png");
var size = TextRendererSk.MeasureText(text, font, 0, flags);
var BackColour = SKColors.Black;
using (SKBitmap bitmap = new SKBitmap((int)size.Width, (int)size.Height, SKColorType.Rgba8888, SKAlphaType.Unpremul))
using (var canvas = new SKCanvas(bitmap))
{
canvas.Clear(BackColour);
TextRendererSk.DrawText(canvas, text, font, SKRect.Create(0, 0, size.Width, size.Height), SKColors.White, flags, options);
using (Stream s = File.Open(fileName, FileMode.Create))
{
SKData d = SKImage.FromBitmap(bitmap).Encode(SKEncodedImageFormat.Png, 100);
d.SaveTo(s);
}
}
Console.WriteLine("Drawing with selection and multiline {0} (fontSize {1}, flags {2}), measured size: {3}", text, fontSize, flags, size);
}
public async ValueTask <byte[]> GetBytesWithFilterAsync(
int size,
string topic = null,
SKImageFilter imageFilter = null,
SKColorFilter colorFilter = null,
SKShader shader = null,
SKBlendMode blendMode = SKBlendMode.Overlay)
{
Trace.WriteLine("Start");
string url;
if (string.IsNullOrEmpty(topic))
{
url = string.Format(URL_PATTERN_RND, size);
}
else
{
url = string.Format(URL_PATTERN, size, topic);
}
var imageInfo = new SKImageInfo(size, size);
using (var http = new HttpClient())
{
var image = await http.GetByteArrayAsync(url);//.ConfigureAwait(false);
Trace.WriteLine("Downloaded");
using (var outStream = new MemoryStream())
using (var bitmap = SKBitmap.Decode(image, imageInfo))
using (var surface = SKSurface.Create(imageInfo))
using (var paint = new SKPaint())
{
SKCanvas canvas = surface.Canvas;
canvas.DrawColor(SKColors.White);
if (imageFilter != null)
{
paint.ImageFilter = imageFilter;
}
if (colorFilter != null)
{
paint.ColorFilter = colorFilter;
}
// draw the bitmap through the filter
var rect = SKRect.Create(imageInfo.Size);
canvas.DrawBitmap(bitmap, rect, paint);
if (shader != null)
{
paint.Shader = shader;
paint.BlendMode = blendMode;
canvas.DrawPaint(paint);
}
SKData data = surface.Snapshot().Encode(SKEncodedImageFormat.Jpeg, 80);
data.SaveTo(outStream);
byte[] manipedImage = outStream.ToArray();
Trace.WriteLine("End");
return(manipedImage);
}
}
}
public static void saveBitmap(SKBitmap bitmap, string path, SKEncodedImageFormat encoding)
{
path = Path.ChangeExtension(path, encoding.ToString().ToLower());
using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write)) {
SKData data = SKImage.FromBitmap(bitmap).Encode(SKEncodedImageFormat.Jpeg, 100);
data.SaveTo(fs);
}
}
void SavePngImage(SKImage image, string fileName)
{
SKData data = image.Encode(SKEncodedImageFormat.Png, 100);
using (FileStream stream = new FileStream(fileName, FileMode.Create))
{
data.SaveTo(stream);
}
}
void SaveJpegImage(SKImage image, string fileName)
{
SKData data = image.Encode(SKEncodedImageFormat.Jpeg, jpegQuality);
using (FileStream stream = new FileStream(fileName, FileMode.Create))
{
data.SaveTo(stream);
}
}
private string TextWatermark(string filePath)
{
SKImage finalImage;
string markedImagePath = string.Empty;
SKBitmap pic = SKBitmap.Decode(filePath);
using (var tempSurface = SKSurface.Create(new SKImageInfo(pic.Width, pic.Height)))
{
//get the drawing canvas of the surface
var canvas = tempSurface.Canvas;
//set background color
canvas.Clear(SKColors.Transparent);
//go through each image and draw it on the final image
int offset = 0;
int offsetTop = 0;
canvas.DrawBitmap(pic, SKRect.Create(offset, offsetTop, pic.Width, pic.Height));
SKPaint paint = new SKPaint
{
Color = SKColors.LightGreen,
TextSize = 50
};
SKPoint offsetPoint = new SKPoint
{
X = pic.Width / 20,
Y = pic.Height * 9.5f / 10
};
SKPath path = new SKPath();
canvas.DrawTextOnPath(watermarkTextEntry.Text, path, offsetPoint, paint);
//canvas.DrawBitmap(stamp, SKRect.Create(offset, pic.Height, 100, 100));
///
// return the surface as a manageable image
finalImage = tempSurface.Snapshot();
}
//save the new image
using (SKData encoded = finalImage.Encode(SKEncodedImageFormat.Png, 100))
using (Stream outFile = File.OpenWrite("storage/emulated/0/Android/data/com.companyname.Forms/files/Pictures/Sample/final.jpg"))
{
encoded.SaveTo(outFile);
image.Source = ImageSource.FromFile("storage/emulated/0/Android/data/com.companyname.Forms/files/Pictures/Sample/final.jpg");
markedImagePath = "storage/emulated/0/Android/data/com.companyname.Forms/files/Pictures/Sample/final.jpg";
}
return(markedImagePath);
}
/// <summary>
/// Resize using SkiaSharp - this can do 100 images in about 30s (2020 i5 MacBook Air).
/// </summary>
/// <param name="source"></param>
/// <param name="destFiles"></param>
public void CreateThumbs(FileInfo source, IDictionary <FileInfo, ThumbConfig> destFiles, out string imageHash)
{
try
{
int desiredWidth = destFiles.Max(x => x.Value.width);
using var sourceBitmap = LoadOrientedBitmap(source, desiredWidth);
imageHash = GetHash(sourceBitmap);
Stopwatch thumbs = new Stopwatch("SkiaSharpThumbs");
// Dropping this from High to Low doesn't have that much of an effect
// in terms of performance.
var quality = SKFilterQuality.Low;
var srcBitmap = sourceBitmap;
foreach (var pair in destFiles.OrderByDescending(x => x.Value.width))
{
var dest = pair.Key;
var config = pair.Value;
float widthScaleFactor = (float)srcBitmap.Width / (float)config.width;
float heighScaleFactor = (float)srcBitmap.Height / (float)config.height;
float scaleFactor = Math.Min(widthScaleFactor, heighScaleFactor);
using var scaledImage = new SKBitmap((int)(srcBitmap.Width / scaleFactor), (int)(srcBitmap.Height / scaleFactor));
srcBitmap.ScalePixels(scaledImage.PeekPixels(), quality);
var cropSize = new SKSize {
Height = config.height, Width = config.width
};
using var cropped = config.cropToRatio ? Crop(scaledImage, cropSize) : scaledImage;
using SKData data = cropped.Encode(SKEncodedImageFormat.Jpeg, 90);
using (var stream = new FileStream(dest.FullName, FileMode.Create, FileAccess.Write))
data.SaveTo(stream);
// Now, use the previous scaled image as the basis for the
// next smaller thumbnail. This should reduce processing
// time as we only work on the large image on the first
// iteration
srcBitmap = scaledImage.Copy();
// TODO: Dispose
}
thumbs.Stop();
}
catch (Exception ex)
{
Logging.Log($"Exception during Skia processing: {ex.Message}");
throw;
}
}
ISerializableObject ImageFromSKData(SKData data, int width, int height)
{
byte [] pngData;
using (var ms = new MemoryStream()) {
data.SaveTo(ms);
pngData = ms.ToArray();
}
return(new Image(ImageFormat.Png, pngData, width, height));
}
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);
}
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);
}
}
private void SaveImage(FsPath file, FsPath targetdir, ILog log, SKData data, string?extensionOverride)
{
FsPath target = targetdir.Combine(file.Filename);
if (extensionOverride != null)
{
var newname = Path.ChangeExtension(file.Filename, extensionOverride);
target = targetdir.Combine(newname);
}
using (var stream = target.CreateStream(log))
{
log.Detail("Saving image: {0}", target);
data.SaveTo(stream);
}
}
public static byte[] getCowsayImage(string fcText, bool writeFile = false, bool postTwitter = true)
{
SKBitmap fcBitmap;
SKImage fcImage;
using (SKPaint fortunePaint = new SKPaint {
TextSize = 12.0f, IsAntialias = true, Color = SKColors.Black, IsStroke = false, Typeface = SKTypeface.FromFamilyName("Courier New")
})
{
// analyse the text a little
int textWidth = 0, textHeight = 0;
string longestText = "";
(textWidth, textHeight, longestText) = calculateTextBounds(fcText);
// set some bounds
SKRect bounds = new SKRect();
fortunePaint.MeasureText(longestText, ref bounds);
bounds.Bottom = textHeight * fortunePaint.TextSize;
fcBitmap = new SKBitmap((int)bounds.Right, (int)bounds.Height);
using (SKCanvas cowsayCanvas = new SKCanvas(fcBitmap))
{
cowsayCanvas.Clear(SKColors.Transparent);
drawTextLines(fcText, 0, 0, fortunePaint, cowsayCanvas);
fcImage = SKImage.FromBitmap(fcBitmap);
SKData fcPNG = fcImage.Encode(SKEncodedImageFormat.Png, 100);
// write image to local file system
if (writeFile == true)
{
using (var filestream = File.OpenWrite("twitter.png"))
{
fcPNG.SaveTo(filestream);
}
}
// Post Image to Twitter
if (postTwitter == true)
{
FDTwitter tweetThis = new FDTwitter(ConsumerKey, ConsumerKeySecret, AccessToken, AccessTokenSecret);
string response = tweetThis.PublishToTwitter("Dogsays on " + DateTime.Now.ToShortDateString(), "", fcPNG.ToArray(), true);
}
return(fcPNG.ToArray());
}
}
}
public static ImageSource GetResizeImageSourceFromUrl(int size, int quality, string url)
{
var httpClient = new System.Net.Http.HttpClient();
var bytes = httpClient.GetByteArrayAsync(serverUrl + url).Result;
var stream = new MemoryStream(bytes);
var bitmap = SKBitmap.Decode(stream);
int width, height;
//Считаем новые размеры исходя из оригенального размера
if (bitmap.Width > bitmap.Height)
{
width = size;
height = bitmap.Height * size / bitmap.Width;
}
else
{
width = bitmap.Width * size / bitmap.Height;
height = size;
}
//Создаем картинку с новым размером
using (var resized = bitmap?.Resize(new SKImageInfo(width, height), SKBitmapResizeMethod.Lanczos3))
{
if (resized == null)
{
throw new Exception("Error resized.");
}
using (var image = SKImage.FromBitmap(resized))
{
SKData encodedData = image.Encode(SKEncodedImageFormat.Jpeg, 100);
string folder = Environment.GetFolderPath(System.Environment.SpecialFolder.MyPictures);
string filename = $"{Guid.NewGuid()}.jpeg";
string imagePath = Path.Combine(FileSystem.CacheDirectory, filename);
var bitmapImageStream = File.Open(imagePath, FileMode.Create, FileAccess.Write, FileShare.None);
encodedData.SaveTo(bitmapImageStream);
bitmapImageStream.Flush(true);
bitmapImageStream.Dispose();
return(ImageSource.FromFile(imagePath));
}
}
}
public static void RenderAndSave(int width = 600, int height = 400, int lineCount = 1_000)
{
var imageInfo = new SKImageInfo(width, height);
var surface = SKSurface.Create(imageInfo);
RandomLines(surface, lineCount);
string filePath = System.IO.Path.GetFullPath("demo.png");
using (System.IO.Stream fileStream = System.IO.File.OpenWrite(filePath))
{
SKImage snap = surface.Snapshot();
SKData encoded = snap.Encode(SKEncodedImageFormat.Png, 100);
encoded.SaveTo(fileStream);
}
Console.WriteLine($"Saved: {filePath}");
}
public async Task ResizeImagesAsync(string sourcePath, string destPath, double scale, CancellationToken token)
{
if (!Directory.Exists(destPath))
{
Directory.CreateDirectory(destPath);
}
var allFiles = FindImages(sourcePath);
List <Task> taskList = new List <Task>();
foreach (var filePath in allFiles)
{
Task t = Task.Run(() => {
// if (token.IsCancellationRequested) {
// Console.WriteLine("他媽不幹了");
// return ;
// }
token.ThrowIfCancellationRequested();
Console.WriteLine("TID\t" + Thread.GetCurrentProcessorId());
SKBitmap bitmap = SKBitmap.Decode(filePath);
SKImage imgPhoto = SKImage.FromBitmap(bitmap);
string imgName = Path.GetFileNameWithoutExtension(filePath);
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int destinationWidth = (int)(sourceWidth * scale);
int destinationHeight = (int)(sourceHeight * scale);
Console.WriteLine(imgName + ".jpg" + " Save TID\t" + Thread.GetCurrentProcessorId());
using SKBitmap scaledBitmap = bitmap.Resize(
new SKImageInfo(destinationWidth, destinationHeight),
SKFilterQuality.High);
using SKImage scaledImage = SKImage.FromBitmap(scaledBitmap);
using SKData data = scaledImage.Encode(SKEncodedImageFormat.Jpeg, 100);
using FileStream s = File.OpenWrite(Path.Combine(destPath, imgName + ".jpg"));
data.SaveTo(s);
Console.WriteLine(imgName + ".jpg" + " Async done with TID\t" + Thread.GetCurrentProcessorId());
});
taskList.Add(t);
}
await Task.WhenAll(taskList);
}
/// <summary>
///
/// </summary>
/// <param name="image"></param>
/// <param name="title"></param>
public void SaveTempImage(SKData image, string title)
{
string docFolder = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string path = Path.Combine(docFolder, title);
using (var memoryStream = new MemoryStream())
{
image.SaveTo(memoryStream);
NSData appleData = NSData.FromArray(memoryStream.ToArray());
UIImage appleImg = UIImage.LoadFromData(appleData);
appleImg.SaveToPhotosAlbum((img, error) => {
var o = img as UIImage;
Console.WriteLine("error:" + error);
});
}
}
public async ValueTask <IActionResult> GetMergeAsync(
int size, string topic = null)
{
Task <byte[]> t1 = DoManipAsync();
Task <byte[]> t2 = DoManipAsync();
async Task <byte[]> DoManipAsync()
{
using (var filter = SKImageFilter.CreateBlur(5, 5))
{
var result = await GetBytesWithFilterAsync(size, topic, filter);//.ConfigureAwait(false);
return(result);
}
}
var results = await Task.WhenAll(t1, t2).ConfigureAwait(false);
var imageInfo = new SKImageInfo(size, size);
var mergeInfo = new SKImageInfo(size * 2, size);
using (var outStream = new MemoryStream())
using (var bitmap0 = SKBitmap.Decode(results[0], imageInfo))
using (var bitmap1 = SKBitmap.Decode(results[1], imageInfo))
using (var surface = SKSurface.Create(mergeInfo))
using (var paint = new SKPaint())
{
SKCanvas canvas = surface.Canvas;
canvas.DrawColor(SKColors.White);
// draw the bitmap through the filter
var rect = SKRect.Create(imageInfo.Size);
canvas.DrawBitmap(bitmap0, rect, paint);
rect = SKRect.Create(size, 0, size, size);
canvas.DrawBitmap(bitmap1, rect, paint);
SKData data = surface.Snapshot().Encode(SKEncodedImageFormat.Jpeg, 80);
data.SaveTo(outStream);
byte[] manipedImage = outStream.ToArray();
var response = File(manipedImage, MEDIA_TYPE);
return(response);
}
}
public void Save(string filePath, int width = 640, int height = 480, int quality = 95)
{
filePath = System.IO.Path.GetFullPath(filePath);
var info = new SKImageInfo(width, height);
using (SKSurface surface = SKSurface.Create(info))
{
Render(surface.Canvas);
using (System.IO.Stream fileStream = System.IO.File.OpenWrite(filePath))
{
// TODO: support BMP, PNG, TIF, GIF, and JPG
SKImage snap = surface.Snapshot();
SKData encoded = snap.Encode(SKEncodedImageFormat.Png, quality);
encoded.SaveTo(fileStream);
Debug.WriteLine($"Wrote: {filePath}");
}
}
}
public static void RenderSvg(SKSvg svg, Stream outStream, SKEncodedImageFormat skFormat, int minSize,
int multiplier)
{
SKRect svgSize = svg.Picture.CullRect;
float svgMax = Math.Max(svgSize.Width, svgSize.Height);
float canvasMin = minSize * multiplier;
float scale = canvasMin / svgMax;
var matrix = SKMatrix.CreateScale(scale, scale);
var bitmap = new SKBitmap((int)(svgSize.Width * scale), (int)(svgSize.Height * scale));
var canvas = new SKCanvas(bitmap);
canvas.Clear();
canvas.DrawPicture(svg.Picture, ref matrix);
canvas.Flush();
var image = SKImage.FromBitmap(bitmap);
SKData data = image.Encode(skFormat, 100);
data.SaveTo(outStream);
}
/// <summary>
/// Image Resize Async method using skiasharp wrapper
/// </summary>
/// <param name="sourceBitmap"></param>
/// <param name="maxWidth"></param>
/// <param name="maxHeight"></param>
/// <param name="quality"></param>
/// <returns>Resized SKBitmap with given parameter</returns>
public async Task <MemoryStream> Resize(byte[] byte_image, int maxWidth, int maxHeight, SKFilterQuality quality = SKFilterQuality.Medium)
{
var bitmap = SKBitmap.Decode(byte_image);
int height = Math.Min(maxHeight, bitmap.Height);
int width = Math.Min(maxWidth, bitmap.Width);
SKBitmap scaledBitmap = null;
await Task.Run(() =>
{
scaledBitmap = bitmap.Resize(new SKImageInfo(width, height), quality);
});
using SKImage img = SKImage.FromBitmap(scaledBitmap);
using SKData new_bitmap = img.Encode(SKEncodedImageFormat.Png, 100);
MemoryStream ms = new MemoryStream();
new_bitmap.SaveTo(ms);
return(ms);
}
static void Main(string[] args)
{
SKImageInfo info = new SKImageInfo(640, 480, SKColorType.Bgra8888, SKAlphaType.Premul);
using (SKBitmap bmp = new SKBitmap(info))
{
using (SKCanvas canvas = new SKCanvas(bmp))
{
canvas.Clear(SKColors.Transparent);
using (SKPaint paint = new SKPaint())
{
paint.IsAntialias = true;
paint.Color = SKColors.Red;
canvas.DrawCircle(100, 100, 100, paint);
}
}
using (SKImage img = SKImage.FromBitmap(bmp))
using (SKData data = img.Encode(SKEncodedImageFormat.Png, 100))
using (System.IO.FileStream fout = System.IO.File.OpenWrite("test.png"))
{
data.SaveTo(fout);
}
}
using (SKBitmap bmp = new SKBitmap(info))
{
using (SKCanvas canvas = new SKCanvas(bmp))
{
canvas.Clear(SKColors.Transparent);
using (SKPaint paint = new SKPaint())
{
paint.IsAntialias = true;
paint.Color = SKColors.Blue;
canvas.DrawRect(50, 50, 200, 200, paint);
}
}
using (SKImage img = SKImage.FromBitmap(bmp))
using (SKData data = img.Encode(SKEncodedImageFormat.Png, 100))
using (System.IO.FileStream fout = System.IO.File.OpenWrite("test1.png"))
{
data.SaveTo(fout);
}
}
}
