public void InitialOffset(int bufferSize)
{
var memStream = new SKMemoryStream(gAbcs);
// Skip a few characters into the memStream, so that bufferedStream represents an offset into
// the stream it wraps.
var arbitraryOffset = 17;
memStream.Skip(arbitraryOffset);
var bufferedStream = new SKFrontBufferedManagedStream(memStream, bufferSize);
// Since SkMemoryStream has a length, bufferedStream must also.
Assert.True(bufferedStream.HasLength);
var amountToRead = 10;
var bufferedLength = bufferedStream.Length;
var currentPosition = 0;
// Read the stream in chunks. After each read, the position must match currentPosition,
// which sums the amount attempted to read, unless the end of the stream has been reached.
// Importantly, the end should not have been reached until currentPosition == bufferedLength.
while (currentPosition < bufferedLength)
{
Assert.False(bufferedStream.IsAtEnd);
test_read(bufferedStream, gAbcs.Skip(arbitraryOffset + currentPosition).ToArray(), amountToRead);
currentPosition = Math.Min(currentPosition + amountToRead, bufferedLength);
Assert.Equal(currentPosition, memStream.Position - arbitraryOffset);
}
Assert.True(bufferedStream.IsAtEnd);
Assert.Equal(bufferedLength, currentPosition);
}
private void Animation(SKCanvas canvas, Animation img)
{
if (img.BinaryImage != null && img.BinaryImage.Length > 0)
{
using (SKStream stream = new SKMemoryStream(img.BinaryImage))
using (SKCodec codec = SKCodec.Create(stream))
{
int frameCount = codec.FrameCount;
int frame = 0;
SKImageInfo imageInfo = new SKImageInfo(
codec.Info.Width,
codec.Info.Height,
codec.Info.ColorType,
codec.Info.AlphaType,
codec.Info.ColorSpace);
var bmp = new SKBitmap(imageInfo);
IntPtr pointer = bmp.GetPixels();
SKCodecOptions codecOptions = new SKCodecOptions(frame);
codec.GetPixels(imageInfo, pointer, codecOptions);
canvas.DrawBitmap(bmp, (float)img.Position.X, (float)img.Position.Y);
}
}
else
{
throw new Exception("Bitmap not provided");
}
}
public void IncrementalBuffering(int bufferSize)
{
var memStream = new SKMemoryStream(gAbcs);
var bufferedStream = new SKFrontBufferedManagedStream(memStream, bufferSize);
test_hasLength(bufferedStream, memStream);
// First, test reading less than the max buffer size.
test_read(bufferedStream, gAbcs, bufferSize / 2);
// Now test rewinding back to the beginning and reading less than what was
// already buffered.
test_rewind(bufferedStream, true);
test_read(bufferedStream, gAbcs, bufferSize / 4);
// Now test reading part of what was buffered, and buffering new data.
test_read(bufferedStream, gAbcs.Skip(bufferSize / 4).ToArray(), bufferSize / 2);
// Now test reading what was buffered, buffering new data, and
// reading directly from the stream.
test_rewind(bufferedStream, true);
test_read(bufferedStream, gAbcs, bufferSize << 1);
// We have reached the end of the buffer, so rewinding will fail.
// This test assumes that the stream is larger than the buffer; otherwise the
// result of rewind should be true.
test_rewind(bufferedStream, false);
}
public unsafe void StreamLosesOwnershipAndCanBeDisposedButIsNotActually()
{
var path = Path.Combine(PathToImages, "color-wheel.png");
var stream = new SKMemoryStream(File.ReadAllBytes(path));
var handle = stream.Handle;
Assert.True(stream.OwnsHandle);
Assert.False(stream.IgnorePublicDispose);
Assert.True(SKObject.GetInstance <SKMemoryStream>(handle, out _));
var codec = SKCodec.Create(stream);
Assert.False(stream.OwnsHandle);
Assert.True(stream.IgnorePublicDispose);
stream.Dispose();
Assert.True(SKObject.GetInstance <SKMemoryStream>(handle, out var inst));
Assert.Same(stream, inst);
Assert.Equal(SKCodecResult.Success, codec.GetPixels(out var pixels));
Assert.NotEmpty(pixels);
codec.Dispose();
Assert.False(SKObject.GetInstance <SKMemoryStream>(handle, out _));
}
public void StreamPeek2()
{
var gAbcsString = "abcdefghijklmnopqrstuvwxyz";
var gAbcs = StringUtilities.GetEncodedText(gAbcsString, SKTextEncoding.Utf8);
var memStream = new SKMemoryStream(gAbcs);
for (var bufferSize = 1; bufferSize < memStream.Length; bufferSize++)
{
var bufferedStream = new SKFrontBufferedManagedStream(memStream, bufferSize);
var peeked = 0;
for (var i = 1; !bufferedStream.IsAtEnd; i++)
{
var unpeekableBytes = compare_peek_to_read(bufferedStream, i);
if (unpeekableBytes > 0)
{
// This could not have returned a number greater than i.
Assert.True(unpeekableBytes <= i);
// We have reached the end of the buffer. Verify that it was at least
// bufferSize.
Assert.True(peeked + i - unpeekableBytes >= bufferSize);
// No more peeking is supported.
break;
}
peeked += i;
}
}
}
protected override void OnDrawSample(SKCanvas canvas, int width, int height)
{
string text = "\u03A3 and \u0750";
canvas.Clear(SKColors.White);
using (var paint = new SKPaint())
{
paint.IsAntialias = true;
using (var tf = SKTypeface.FromFile(SampleMedia.Fonts.ContentFontPath))
{
paint.Color = SampleMedia.Colors.XamarinGreen;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 50, paint);
}
using (var fileStream = new SKFileStream(SampleMedia.Fonts.ContentFontPath))
using (var tf = SKTypeface.FromStream(fileStream))
{
paint.Color = SampleMedia.Colors.XamarinDarkBlue;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 100, paint);
}
using (var resource = SampleMedia.Fonts.EmbeddedFont)
using (var memory = new MemoryStream())
{
resource.CopyTo(memory);
var bytes = memory.ToArray();
using (var stream = new SKMemoryStream(bytes))
using (var tf = SKTypeface.FromStream(stream))
{
paint.Color = SampleMedia.Colors.XamarinLightBlue;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 150, paint);
}
}
using (var managedResource = SampleMedia.Fonts.EmbeddedFont)
using (var managedStream = new SKManagedStream(managedResource, true))
using (var tf = SKTypeface.FromStream(managedStream))
{
paint.Color = SampleMedia.Colors.XamarinPurple;
paint.TextSize = 60;
paint.Typeface = tf;
canvas.DrawText(text, 50, 200, paint);
}
}
}
public void StreamPeek()
{
var gAbcsString = "abcdefghijklmnopqrstuvwxyz";
var gAbcs = StringUtilities.GetEncodedText(gAbcsString, SKTextEncoding.Utf8);
var memStream = new SKMemoryStream(gAbcs);
test_fully_peekable_stream(memStream, memStream.Length);
}
public async Task SaveImage(string path, byte[] imageBytes, int compression = 100)
{
using var ms = new SKMemoryStream(imageBytes);
using var original = SKBitmap.Decode(ms);
var resizedHeight = original.Height > 2500 ? original.Height / 2 : original.Height;
var resizedWidth = original.Width > 2500 ? original.Width / 2 : original.Width;
var imageInfo = new SKImageInfo(resizedWidth, resizedHeight);
var resizedBitmap = new SKBitmap(imageInfo);
original.ScalePixels(resizedBitmap, SKFilterQuality.High);
using var image = SKImage.FromBitmap(resizedBitmap);
await using var output = File.OpenWrite(path);
image.Encode(SKEncodedImageFormat.Jpeg, compression).SaveTo(output);
}
public static SKImage Load(string filePath)
{
using var image = Pfim.Pfim.FromFile(filePath);
var newData = image.Data;
var stride = image.Stride;
var colorType = SkColorType(image, ref newData, ref stride);
var imageInfo = new SKImageInfo(image.Width, image.Height, colorType);
using var stream = new SKMemoryStream(newData);
using var data = SKData.Create(stream);
var fromPixelData = SKImage.FromPixelData(imageInfo, data, stride);
return(fromPixelData);
}
public void MemoryStreamCanBeForked()
{
var stream = new SKMemoryStream(new byte[] { 1, 2, 3, 4, 5 });
Assert.Equal(1, stream.ReadByte());
Assert.Equal(2, stream.ReadByte());
var dupe = stream.Fork();
Assert.NotSame(stream, dupe);
Assert.IsType <SKStreamImplementation>(dupe);
Assert.Equal(3, dupe.ReadByte());
Assert.Equal(3, stream.ReadByte());
Assert.Equal(4, dupe.ReadByte());
Assert.Equal(4, stream.ReadByte());
}
protected override SKTypeface GetTypeface(PdfDictionary fontDescription, PdfStream stream)
{
var buffer = stream.GetBody(true);
var lenght1 = stream.Header[PdfName.Length1] as PdfInteger;
var bytes = buffer.ToByteArray();
using (var data = new SKMemoryStream(bytes))
{
typeface = SKFontManager.Default.CreateTypeface(data);
}
if (typeface == null)
{
typeface = ParseName(fontDescription.Resolve(PdfName.FontName)?.ToString(), stream.Header);
}
return(typeface);
}
protected virtual SKTypeface GetTypeface(PdfDictionary fontDescription, PdfStream stream)
{
var name = fontDescription.Resolve(PdfName.FontName)?.ToString();
var body = stream.GetBody(true).ToByteArray();
//System.IO.File.WriteAllBytes($"export{name}.ttf", body);
var data = new SKMemoryStream(body);
var typeface = SKFontManager.Default.CreateTypeface(data);
// var typeface = SKTypeface.FromStream(data);
if (typeface == null)
{
typeface = ParseName(name, fontDescription);
}
return(typeface);
}
public unsafe void StreamLosesOwnershipToCodecButIsNotForgotten()
{
var bytes = File.ReadAllBytes(Path.Combine(PathToImages, "color-wheel.png"));
var stream = new SKMemoryStream(bytes);
var handle = stream.Handle;
Assert.True(stream.OwnsHandle);
Assert.True(SKObject.GetInstance <SKMemoryStream>(handle, out _));
var codec = SKCodec.Create(stream);
Assert.False(stream.OwnsHandle);
stream.Dispose();
Assert.True(SKObject.GetInstance <SKMemoryStream>(handle, out _));
Assert.Equal(SKCodecResult.Success, codec.GetPixels(out var pixels));
Assert.NotEmpty(pixels);
}
public unsafe void StreamLosesOwnershipAndCanBeGarbageCollected()
{
VerifyImmediateFinalizers();
var bytes = File.ReadAllBytes(Path.Combine(PathToImages, "color-wheel.png"));
DoWork(out var codecH, out var streamH);
CollectGarbage();
Assert.False(SKObject.GetInstance <SKMemoryStream>(streamH, out _));
Assert.False(SKObject.GetInstance <SKCodec>(codecH, out _));
void DoWork(out IntPtr codecHandle, out IntPtr streamHandle)
{
var codec = CreateCodec(out streamHandle);
codecHandle = codec.Handle;
CollectGarbage();
Assert.Equal(SKCodecResult.Success, codec.GetPixels(out var pixels));
Assert.NotEmpty(pixels);
Assert.True(SKObject.GetInstance <SKMemoryStream>(streamHandle, out var stream));
Assert.False(stream.OwnsHandle);
Assert.True(stream.IgnorePublicDispose);
}
SKCodec CreateCodec(out IntPtr streamHandle)
{
var stream = new SKMemoryStream(bytes);
streamHandle = stream.Handle;
Assert.True(stream.OwnsHandle);
Assert.False(stream.IgnorePublicDispose);
Assert.True(SKObject.GetInstance <SKMemoryStream>(streamHandle, out _));
return(SKCodec.Create(stream));
}
}
/// <summary>
/// Load embeded font
/// </summary>
/// <param name="fontName"></param>
/// <returns></returns>
public static SKTypeface LoadTtfFont(string fontName)
{
var assembly = typeof(SkiaSharpHelper).GetTypeInfo().Assembly;
var file = $"WavesGraphs.Resources.Fonts.{fontName}.ttf";
using (var resource = assembly.GetManifestResourceStream(file))
{
using (var memory = new MemoryStream())
{
resource?.CopyTo(memory);
var bytes = memory?.ToArray();
using (var stream = new SKMemoryStream(bytes))
{
return(SKTypeface.FromStream(stream));
}
}
}
}
public void PerfectlySizedBuffer(int bufferSize)
{
var memStream = new SKMemoryStream(gAbcs);
var bufferedStream = new SKFrontBufferedManagedStream(memStream, bufferSize);
test_hasLength(bufferedStream, memStream);
// Read exactly the amount that fits in the buffer.
test_read(bufferedStream, gAbcs, bufferSize);
// Rewinding should succeed.
test_rewind(bufferedStream, true);
// Once again reading buffered info should succeed
test_read(bufferedStream, gAbcs, bufferSize);
// Read past the size of the buffer. At this point, we cannot return.
test_read(bufferedStream, gAbcs.Skip(memStream.Position).ToArray(), 1);
test_rewind(bufferedStream, false);
}
public unsafe void StreamLosesOwnershipAndCanBeGarbageCollected()
{
VerifyImmediateFinalizers();
var bytes = File.ReadAllBytes(Path.Combine(PathToFonts, "Distortable.ttf"));
DoWork(out var typefaceH, out var streamH);
CollectGarbage();
Assert.False(SKObject.GetInstance <SKMemoryStream>(streamH, out _));
Assert.False(SKObject.GetInstance <SKTypeface>(typefaceH, out _));
void DoWork(out IntPtr typefaceHandle, out IntPtr streamHandle)
{
var typeface = CreateTypeface(out streamHandle);
typefaceHandle = typeface.Handle;
CollectGarbage();
Assert.NotEmpty(typeface.GetTableTags());
Assert.True(SKObject.GetInstance <SKMemoryStream>(streamHandle, out var stream));
Assert.False(stream.OwnsHandle);
Assert.True(stream.IgnorePublicDispose);
}
SKTypeface CreateTypeface(out IntPtr streamHandle)
{
var stream = new SKMemoryStream(bytes);
streamHandle = stream.Handle;
Assert.True(stream.OwnsHandle);
Assert.False(stream.IgnorePublicDispose);
Assert.True(SKObject.GetInstance <SKMemoryStream>(streamHandle, out _));
return(SKTypeface.FromStream(stream));
}
}
protected override SKTypeface GetTypeface(PdfDictionary fontDescription, PdfStream stream)
{
var name = fontDescription.Resolve(PdfName.FontName)?.ToString();
var buffer = stream.GetBody(true);
//var lenght1 = stream.Header[PdfName.Length1] as PdfInteger;
//var lenght2 = stream.Header[PdfName.Length2] as PdfInteger;
//var lenght3 = stream.Header[PdfName.Length3] as PdfInteger;
//var bytes = buffer.GetByteArray(lenght1.IntValue, lenght2.IntValue + lenght3.IntValue);
//System.IO.File.WriteAllBytes($"export{name}_part2.psc", bytes);
var bytes = buffer.ToByteArray();
var typeface = (SKTypeface)null;
using (var data = new SKMemoryStream(bytes))
{
typeface = SKFontManager.Default.CreateTypeface(data);
}
#if DEBUG
name = Regex.Replace(name, @"[\/?:*""><|]+", "", RegexOptions.Compiled);
try { System.IO.File.WriteAllBytes($"export_{name}.psc", bytes); }
catch { }
//if (typeface == null)
//{
// using (var manifestStream = typeof(Type1Font).Assembly.GetManifestResourceStream(name + ".otf"))
// {
// if (manifestStream != null)
// {
// typeface = SKFontManager.Default.CreateTypeface(manifestStream);
// }
// }
//}
#endif
if (typeface == null)
{
typeface = ParseName(name, fontDescription);
}
return(typeface);
}
public void StreamPeek3()
{
var gAbcsString = "abcdefghijklmnopqrstuvwxyz";
var gAbcs = StringUtilities.GetEncodedText(gAbcsString, SKTextEncoding.Utf8);
for (var bufferSize = 1; bufferSize < gAbcs.Length; bufferSize++)
{
var memStream = new SKMemoryStream(gAbcs);
var bufferedStream = new SKFrontBufferedManagedStream(memStream, bufferSize);
var bytesToPeek = bufferSize + 1;
var peekStorage = SKData.Create(bytesToPeek);
var readStorage = SKData.Create(bytesToPeek);
for (var start = 0; start <= bufferSize; start++)
{
// Skip to the starting point
Assert.Equal(start, bufferedStream.Skip(start));
var bytesPeeked = bufferedStream.Peek(peekStorage.Data, bytesToPeek);
if (0 == bytesPeeked)
{
// Peeking should only fail completely if we have read/skipped beyond the buffer.
Assert.True(start >= bufferSize);
break;
}
// Only read the amount that was successfully peeked.
var bytesRead = bufferedStream.Read(readStorage.Data, bytesPeeked);
Assert.Equal(bytesPeeked, bytesRead);
Assert.Equal(peekStorage.ToArray().Take(bytesPeeked), readStorage.ToArray().Take(bytesPeeked));
// This should be safe to rewind.
Assert.True(bufferedStream.Rewind());
}
}
}
public void SkippingDoesNotPreventReading(int bufferSize)
{
var memStream = new SKMemoryStream(gAbcs);
var bufferedStream = new SKFrontBufferedManagedStream(memStream, bufferSize);
test_hasLength(bufferedStream, memStream);
// Skip half the buffer.
bufferedStream.Skip(bufferSize / 2);
// Rewind, then read part of the buffer, which should have been read.
test_rewind(bufferedStream, true);
test_read(bufferedStream, gAbcs, bufferSize / 4);
// Now skip beyond the buffered piece, but still within the total buffer.
bufferedStream.Skip(bufferSize / 2);
// Test that reading will still work.
test_read(bufferedStream, gAbcs.Skip(memStream.Position).ToArray(), bufferSize / 4);
test_rewind(bufferedStream, true);
test_read(bufferedStream, gAbcs, bufferSize);
}
public unsafe void StreamLosesOwnershipAndCanBeDisposedButIsNotActually()
{
var path = Path.Combine(PathToFonts, "Distortable.ttf");
var stream = new SKMemoryStream(File.ReadAllBytes(path));
var handle = stream.Handle;
Assert.True(stream.OwnsHandle);
Assert.False(stream.IgnorePublicDispose);
Assert.True(SKObject.GetInstance <SKMemoryStream>(handle, out _));
var typeface = SKTypeface.FromStream(stream);
Assert.False(stream.OwnsHandle);
Assert.True(stream.IgnorePublicDispose);
stream.Dispose();
Assert.True(SKObject.GetInstance <SKMemoryStream>(handle, out var inst));
Assert.Same(stream, inst);
Assert.NotEmpty(typeface.GetTableTags());
typeface.Dispose();
Assert.False(SKObject.GetInstance <SKMemoryStream>(handle, out _));
}
private void Load(SKMemoryStream stream, uint index = 0)
{
Load(stream.ToHarfBuzzBlob());
}
//Note: PM> Install-Package SkiaSharp
public static Byte[] shrinkImagePNG(Byte[] originalImage, int max_height = 100, int max_width = 120)
{
//Code by David Stovell from ideas I found in various posts on the internet
//originalImage is the Byte Array from the uploaded file.
//max_height and max_width are the dimensions to shrink the image down to. Supply your
//own values if you do not want the defaults.
//NOTE: This code maintains aspect ratio so for example, a tall, narrow image will
// shrink until the height matches max_height but the width will be smaller then max_width.
//NOTE: If the image is smaller it will not be enlarged.
//NOTE: The MimeType of the resized image is image/png
using (SKMemoryStream sourceStream = new SKMemoryStream(originalImage))
{
using (SKCodec codec = SKCodec.Create(sourceStream))
{
sourceStream.Seek(0);
using (SKImage image = SKImage.FromEncodedData(SKData.Create(sourceStream)))
{
int newHeight = image.Height;
int newWidth = image.Width;
if (max_height > 0 && newHeight > max_height)
{
double scale = (double)max_height / newHeight;
newHeight = max_height;
newWidth = (int)Math.Floor(newWidth * scale);
}
if (max_width > 0 && newWidth > max_width)
{
double scale = (double)max_width / newWidth;
newWidth = max_width;
newHeight = (int)Math.Floor(newHeight * scale);
}
var info = codec.Info.ColorSpace.IsSrgb ? new SKImageInfo(newWidth, newHeight) : new SKImageInfo(newWidth, newHeight, SKImageInfo.PlatformColorType, SKAlphaType.Premul, SKColorSpace.CreateSrgb());
using (SKSurface surface = SKSurface.Create(info))
{
using (SKPaint paint = new SKPaint())
{
// High quality without antialiasing
paint.IsAntialias = true;
paint.FilterQuality = SKFilterQuality.High;
// Draw the bitmap to fill the surface
surface.Canvas.Clear(SKColors.White);
var rect = new SKRect(0, 0, newWidth, newHeight);
surface.Canvas.DrawImage(image, rect, paint);
surface.Canvas.Flush();
using (SKImage newImage = surface.Snapshot())
{
using (SKData newImageData = newImage.Encode())
{
return(newImageData.ToArray());
}
}
}
}
}
}
}
}