public static unsafe SKPixmap WaveletUpscale(this SKImage image, Wavelet wavelet)
{
int width = image.Width;
int height = image.Height;
int upscaledWidth = width * 2;
int upscaledHeight = height * 2;
float[,] y = new float[upscaledWidth, upscaledWidth];
float[,] cb = new float[upscaledWidth, upscaledWidth];
float[,] cr = new float[upscaledWidth, upscaledWidth];
float[,] a = new float[upscaledWidth, upscaledWidth];
image.ToYCbCrAArrays(y, cb, cr, a);
WaveletTransform2D wavelet2D;
WaveletTransform2D upscaledWavelet2D;
switch (wavelet)
{
case Wavelet.Haar:
wavelet2D = new HaarWavelet2D(width, height);
upscaledWavelet2D = new HaarWavelet2D(upscaledWidth, upscaledHeight);
break;
case Wavelet.Biorthogonal53:
default:
wavelet2D = new Biorthogonal53Wavelet2D(width, height);
upscaledWavelet2D = new Biorthogonal53Wavelet2D(upscaledWidth, upscaledHeight);
break;
}
wavelet2D.Transform2D(y);
wavelet2D.Transform2D(cb);
wavelet2D.Transform2D(cr);
wavelet2D.Transform2D(a);
upscaledWavelet2D.ReverseTransform2D(y);
upscaledWavelet2D.ReverseTransform2D(cb);
upscaledWavelet2D.ReverseTransform2D(cr);
upscaledWavelet2D.ReverseTransform2D(a);
for (int row = 0; row < upscaledHeight; row++)
{
for (int col = 0; col < upscaledWidth; col++)
{
y[col, row] *= 4.0f;
cb[col, row] *= 4.0f;
cr[col, row] *= 4.0f;
a[col, row] *= 4.0f;
}
}
SKImageInfo info = new SKImageInfo(upscaledWidth, upscaledHeight, SKColorType.Rgba8888);
SKImage output = SKImage.Create(info);
SKPixmap pixmap = output.ToRGBAPixmap(y, cb, cr, a);
return(pixmap);
}
public static SKImage Resize(this SKImage input, int width, int height)
{
var imageInfo = new SKImageInfo(width, height);
SKImage image = SKImage.Create(imageInfo);
input.ScalePixels(image.PeekPixels(), SKFilterQuality.High);
return(image);
}
private SKBitmap Scale(SKBitmap input, int width, int height)
{
var info = new SKImageInfo(width, height);
var newImg = SKImage.Create(info);
input.ScalePixels(newImg.PeekPixels(), SKFilterQuality.Medium);
return(SKBitmap.FromImage(newImg));
}
public static void mergeTiles(string folderPath)
{
if (folderPath.Last() == '/' || folderPath.Last() == '\\')
{
folderPath = folderPath.Remove(folderPath.Length - 1);
}
Dictionary <string, SKImage> images = new Dictionary <string, SKImage>();
int maxNumOfLevels = 3;
for (int level = maxNumOfLevels; level > 0; --level)
{
int numOfTiles = Convert.ToInt32(Math.Pow(4, level - 1));
int tilesToASide = Convert.ToInt32(Math.Sqrt(numOfTiles));
for (int globaly = 0; globaly < tilesToASide; ++globaly)
{
for (int globalx = 0; globalx < tilesToASide; ++globalx)
{
var tempSurface = SKSurface.Create(new SKImageInfo(512, 512));
var canvas = tempSurface.Canvas;
canvas.Clear(SKColors.Transparent);
for (int tiley = 0; tiley < 2; ++tiley)
{
for (int tilex = 0; tilex < 2; ++tilex)
{
int imgx = (globalx * 2 + tilex);
int imgy = (globaly * 2 + tiley);
string tilePath = $"{folderPath}/aqlatestL{level}T{(globalx * 2 + tilex).ToString("D2")}{(globaly * 2 + tiley).ToString("D2")}.png";
string tileKey = $"L{level}T{(globalx * 2 + tilex).ToString("D2")}{(globaly * 2 + tiley).ToString("D2")}";
if (images.ContainsKey(tileKey))
{
SKBitmap tile = SKBitmap.FromImage(images[tileKey]);
canvas.DrawBitmap(tile, SKRect.Create(tilex * 256, tiley * 256, tile.Width, tile.Height));
}
else if (File.Exists(tilePath))
{
SKBitmap tile = SKBitmap.Decode(File.OpenRead(tilePath));
canvas.DrawBitmap(tile, SKRect.Create(tilex * 256, tiley * 256, tile.Width, tile.Height));
}
}
}
SKBitmap bigTile = SKBitmap.FromImage(tempSurface.Snapshot());
SKBitmap littleTile = SKBitmap.FromImage(SKImage.Create(new SKImageInfo(256, 256)));
bigTile.ScalePixels(littleTile, SKFilterQuality.High);
SKImage outTile = SKImage.FromBitmap(littleTile);
images.Add($"L{level - 1}T{globalx.ToString("D2")}{globaly.ToString("D2")}", outTile);
}
}
}
foreach (KeyValuePair <string, SKImage> file in images)
{
var data = file.Value.Encode();
var stream = File.OpenWrite($"{folderPath}/aqlatest{file.Key}.png");
data.SaveTo(stream);
}
}
public void ImageCreateDoesNotThrow()
{
var info = new SKImageInfo(1, 1);
using (var image = SKImage.Create(info)) {
Assert.IsFalse(image.IsTextureBacked);
Assert.AreEqual(image, image.ToRasterImage());
}
}
public static SKImage ToSKImage(this Bitmap bitmap)
{
SKImage sKImage = SKImage.Create(new SKImageInfo(bitmap.Width, bitmap.Height));
using (SKPixmap pixmap = sKImage.PeekPixels())
{
bitmap.ToSKPixmap(pixmap);
return(sKImage);
}
}
public static SKImage ToSKImage(this CGImage cgImage)
{
var info = new SKImageInfo((int)cgImage.Width, (int)cgImage.Height);
var image = SKImage.Create(info);
using (var pixmap = image.PeekPixels())
{
cgImage.ToSKPixmap(pixmap);
}
return(image);
}
public static SKImage ToSKImage(this BitmapSource bitmap)
{
var info = new SKImageInfo(bitmap.PixelWidth, bitmap.PixelHeight);
var image = SKImage.Create(info);
using (var pixmap = image.PeekPixels())
{
bitmap.ToSKPixmap(pixmap);
}
return(image);
}
public void ImageInfoHasColorSpace()
{
var colorspace = SKColorSpace.CreateSrgb();
var info = new SKImageInfo(100, 100, SKImageInfo.PlatformColorType, SKAlphaType.Premul, colorspace);
Assert.Equal(colorspace, info.ColorSpace);
var image = SKImage.Create(info);
Assert.Equal(colorspace, image.PeekPixels().ColorSpace);
}
public static SKImage ToSKImage(this CIImage ciImage)
{
var extent = ciImage.Extent;
var info = new SKImageInfo((int)extent.Width, (int)extent.Height);
var image = SKImage.Create(info);
using (var pixmap = image.PeekPixels())
{
ciImage.ToSKPixmap(pixmap);
}
return(image);
}
static SKImage toSKImage(BitmapSource bitmap)
{
// TODO: maybe keep the same color types where we can, instead of just going to the platform default
var info = new SKImageInfo(bitmap.PixelWidth, bitmap.PixelHeight);
var image = SKImage.Create(info);
using (var pixmap = image.PeekPixels())
{
toSKPixmap(bitmap, pixmap);
}
return(image);
}
public static SKImage ToSKImage(this System.Drawing.Bitmap bitmap)
{
// TODO: maybe keep the same color types where we can, instead of just going to the platform default
var info = new SKImageInfo(bitmap.Width, bitmap.Height);
var image = SKImage.Create(info);
using (var pixmap = image.PeekPixels())
{
bitmap.ToSKPixmap(pixmap);
}
return(image);
}
private static string CreateInputFile()
{
var inputPath = GetTempPath();
using (var stream = File.OpenWrite(inputPath))
{
SKBitmap.FromImage(SKImage.Create(new SKImageInfo(100, 100)))
.PeekPixels()
.Encode(SKPngEncoderOptions.Default)
.SaveTo(stream);
}
return(inputPath);
}
public ImmutableBitmap(ImmutableBitmap src, PixelSize destinationSize, BitmapInterpolationMode interpolationMode)
{
SKImageInfo info = new SKImageInfo(destinationSize.Width, destinationSize.Height, SKColorType.Bgra8888);
SKImage output = SKImage.Create(info);
src._image.ScalePixels(output.PeekPixels(), interpolationMode.ToSKFilterQuality());
_image = output;
PixelSize = new PixelSize(_image.Width, _image.Height);
// TODO: Skia doesn't have an API for DPI.
Dpi = new Vector(96, 96);
}
public async Task ImageReturnsSameImage()
{
using var image = SKImage.Create(new SKImageInfo(100, 100));
var source = new SKImageImageSource {
Image = image
};
var result = await source.ToSKImageAsync();
Assert.NotNull(result);
Assert.Equal(image, result);
}
public void LazyRasterCanReadToNonLazy()
{
using var data = SKData.Create(Path.Combine(PathToImages, "baboon.jpg"));
using var image = SKImage.FromEncodedData(data);
Assert.True(image.IsLazyGenerated);
var info = new SKImageInfo(image.Width, image.Height);
using var copy = SKImage.Create(info);
using var pix = copy.PeekPixels();
Assert.True(image.ReadPixels(pix));
Assert.False(copy.IsLazyGenerated);
Assert.NotNull(copy.PeekPixels());
}
public SnapshotImage GetSnapshotAndAddUser(int id)
{
lock (_snapshotLock)
{
if (_snapshots.TryGetValue(id, out var snapshotImage))
{
snapshotImage.AddUser();
return(snapshotImage);
}
return(new SnapshotImage(
SKImage.Create(new SKImageInfo(1, 1)),
new SKSizeI(0, 0)
));
}
}
public RoomData(string id)
{
RoomId = id;
ImageInfo = new SKImageInfo(800, 600);
Image = SKImage.Create(new SKImageInfo(800, 600));
Surface = SKSurface.Create(ImageInfo);
Paint = new SKPaint
{
IsAntialias = true,
Color = new SKColor(0, 0, 0, 255),
StrokeWidth = 4,
PathEffect = SKPathEffect.CreateCorner(50),
Style = SKPaintStyle.Stroke
};
Path = new SKPath();
}
public static SKImage CaptureRegion(int x, int y, int width, int height)
{
IntPtr sourceDC = IntPtr.Zero;
IntPtr targetDC = IntPtr.Zero;
IntPtr compatibleBitmapHandle = IntPtr.Zero;
// create the final SkiaSharp image
SKImage image = SKImage.Create(new SKImageInfo(width, height));
SKPixmap pixmap = image.PeekPixels();
try
{
// gets the main desktop and all open windows
sourceDC = User32.GetDC(User32.GetDesktopWindow());
targetDC = Gdi32.CreateCompatibleDC(sourceDC);
// create a bitmap compatible with our target DC
compatibleBitmapHandle = Gdi32.CreateCompatibleBitmap(sourceDC, width, height);
// gets the bitmap into the target device context
Gdi32.SelectObject(targetDC, compatibleBitmapHandle);
// copy from source to destination
Gdi32.BitBlt(targetDC, 0, 0, width, height, sourceDC, x, y, Gdi32.TernaryRasterOperations.SRCCOPY);
// create the info structure
Gdi32.BITMAPINFOHEADER bmi = new Gdi32.BITMAPINFOHEADER();
bmi.biPlanes = 1;
bmi.biBitCount = 32;
bmi.biWidth = width;
bmi.biHeight = -height;
bmi.biCompression = Gdi32.BitmapCompressionMode.BI_RGB;
// read the raw pixels into the pixmap for the image
Gdi32.GetDIBits(targetDC, compatibleBitmapHandle, 0, height, pixmap.GetPixels(), bmi, Gdi32.DIB_Color_Mode.DIB_RGB_COLORS);
}
finally
{
Gdi32.DeleteObject(compatibleBitmapHandle);
User32.ReleaseDC(IntPtr.Zero, sourceDC);
User32.ReleaseDC(IntPtr.Zero, targetDC);
}
return(image);
}
private static Stream CreateImage(int width,
int height,
Action <SKBitmap> bitmapModifier)
{
var image = SKImage.Create(new SKImageInfo(width, height));
var bitmap = SKBitmap.FromImage(image);
// Modify graphic
bitmapModifier(bitmap);
// Prepare result stream
var result = new MemoryStream();
bitmap.Encode(result, SKEncodedImageFormat.Png, 100);
// Set result pointer back to 0 for the result consumer to read
result.Position = 0;
// Closing the stream is up to the consumer
return(result);
}
public async Task StreamReturnsSimilarImage()
{
var info = new SKImageInfo(100, 100, SKImageInfo.PlatformColorType, SKAlphaType.Premul, SKColorSpace.CreateSrgb());
using var image = SKImage.Create(info);
using var data = image.Encode();
using var stream = data.AsStream();
var source = new StreamImageSource {
Stream = token => Task.FromResult(stream)
};
var result = await source.ToSKImageAsync();
Assert.NotNull(result);
var resultInfo = new SKImageInfo(result.Width, result.Height, result.ColorType, result.AlphaType, result.ColorSpace);
Assert.Equal(info, resultInfo);
}
protected virtual SKImage ConvertProfile(SKImage data, float width, float height)
{
using SKImage srcImg = data;
SKImageInfo info = new SKImageInfo((int)width, (int)height,
SKImageInfo.PlatformColorType, SKAlphaType.Opaque, SKColorSpace.CreateSrgb());
// this is the important part. set the destination ColorSpace as
// `SKColorSpace.CreateSrgb()`. Skia will then be able to automatically convert
// the original CMYK colorspace, to this new sRGB colorspace.
SKImage newImg = SKImage.Create(info);
srcImg.ScalePixels(newImg.PeekPixels(), SKFilterQuality.None);
// Remove transparency
var bitmap = RemoveTransparency(srcImg);
newImg = SKImage.FromBitmap(bitmap);
// now when doing this resize, Skia knows the original ColorSpace, and the
// destination ColorSpace, and converts the colors from CMYK to sRGB.
return(newImg);
}
private static SKImage CreateLabelAsBitmap(LabelStyle style, string text, SKPaint paint, float layerOpacity)
{
var rect = new SKRect();
paint.MeasureText(text, ref rect);
var backRect = new SKRect(0, 0, rect.Width + 6, rect.Height + 6);
var skImageInfo = new SKImageInfo((int)backRect.Width, (int)backRect.Height);
var bitmap = SKImage.Create(skImageInfo);
// todo: Construct SKCanvas with SKImage once this option becomes available
using (var target = new SKCanvas(SKBitmap.FromImage(bitmap)))
{
target.Clear();
DrawBackground(style, backRect, target, layerOpacity);
target.DrawText(text, -rect.Left + 3, -rect.Top + 3, paint);
return(bitmap);
}
}
public static SKImage GetImage(this SKCodecFrameInfo info, SKCodec codec)
{
return(SKImage.Create(codec.Info));
}
/// <summary>
/// Load an image from the phone
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private async void LoadImage(object sender, EventArgs args)
{
IPhotoLibrary photoLibrary = DependencyService.Get <IPhotoLibrary>();
using (Stream stream = await photoLibrary.PickPhotoAsync())
{
if (stream != null)
{
SKBitmap loaded = SKBitmap.Decode(stream);
if (loaded != null)
{
if (animation)
{
StopAccelerometer();
}
//Set the image dimensions
width = (int)imgGenerated.CanvasSize.ToFormsSize().Width;
height = (int)imgGenerated.CanvasSize.ToFormsSize().Height;
int oldSize = width;
if (width > height)
{
oldSize = height;
}
int size = oldSize;
for (int i = 1; i < oldSize; i <<= 1)
{
size = i;
}
width = size;
height = size;
generator.SetDimensions(width, height);
// Resize the loaded image
//source: https://stackoverflow.com/questions/48422724/fastest-way-to-scale-an-skimage-skiasharp
SKImageInfo info = new SKImageInfo(width, height, SKColorType.Rgba8888);
SKImage output = SKImage.Create(info);
loaded.ScalePixels(output.PeekPixels(), SKFilterQuality.None);
imgBitmap = SKBitmap.FromImage(output);
skRect = new SKRect(0, 0, oldSize, oldSize);
generator.Load(imgBitmap);
imgGenerated.InvalidateSurface();
if (animation)
{
StartAccelerometer();
}
}
}
}
}
public void ImageInfoColorSpaceIsReferencedCorrectly()
{
VerifyImmediateFinalizers();
var img = DoWork(out var colorspaceHandle);
CollectGarbage();
Assert.Equal(1, colorspaceHandle.GetReferenceCount(true));
Check();
CollectGarbage();
Assert.Equal(1, colorspaceHandle.GetReferenceCount(true));
void Check()
{
var peek = img.PeekPixels();
Assert.Equal(2, colorspaceHandle.GetReferenceCount(true));
// get the info and color space
var info1 = peek.Info;
var cs1 = info1.ColorSpace;
Assert.Equal(3, colorspaceHandle.GetReferenceCount(true));
Assert.NotNull(cs1);
// get the info and color space again and make sure we are all using the same things
var info2 = peek.Info;
var cs2 = info2.ColorSpace;
Assert.Equal(3, colorspaceHandle.GetReferenceCount(true));
Assert.NotNull(cs2);
Assert.Same(cs1, cs2);
}
SKImage DoWork(out IntPtr handle)
{
var colorspace = SKColorSpace.CreateRgb(
new SKColorSpaceTransferFn {
A = 0.6f, B = 0.5f, C = 0.4f, D = 0.3f, E = 0.2f, F = 0.1f
},
SKMatrix44.CreateIdentity());
Assert.NotNull(colorspace);
handle = colorspace.Handle;
Assert.Equal(1, handle.GetReferenceCount(true));
var info = new SKImageInfo(100, 100, SKImageInfo.PlatformColorType, SKAlphaType.Premul, colorspace);
Assert.Equal(1, handle.GetReferenceCount(true));
var image = SKImage.Create(info);
Assert.Equal(2, handle.GetReferenceCount(true));
return(image);
}
}
public void ColorSpaceIsNotDisposedPrematurely()
{
VerifyImmediateFinalizers();
var img = DoWork(out var colorSpaceHandle, out var weakColorspace);
CheckBeforeCollection(colorSpaceHandle);
CheckExistingImage(3, img, colorSpaceHandle);
CollectGarbage();
Assert.Null(weakColorspace.Target);
Assert.Equal(1, colorSpaceHandle.GetReferenceCount(true));
CheckExistingImage(2, img, colorSpaceHandle);
CollectGarbage();
Assert.Null(weakColorspace.Target);
Assert.Equal(1, colorSpaceHandle.GetReferenceCount(true));
CollectGarbage();
Assert.Equal(1, colorSpaceHandle.GetReferenceCount(true));
GC.KeepAlive(img);
void CheckBeforeCollection(IntPtr csh)
{
Assert.NotNull(weakColorspace.Target);
Assert.Equal(2, csh.GetReferenceCount(true));
}
void CheckExistingImage(int expected, SKImage image, IntPtr csh)
{
var peek = image.PeekPixels();
Assert.Equal(expected, csh.GetReferenceCount(true));
var info = peek.Info;
Assert.Equal(3, csh.GetReferenceCount(true));
var cs = info.ColorSpace;
Assert.Equal(3, csh.GetReferenceCount(true));
Assert.NotNull(cs);
}
SKImage DoWork(out IntPtr handle, out WeakReference weak)
{
var colorspace = SKColorSpace.CreateRgb(
new SKColorSpaceTransferFn {
A = 0.1f, B = 0.2f, C = 0.3f, D = 0.4f, E = 0.5f, F = 0.6f
},
SKMatrix44.CreateIdentity());
Assert.NotNull(colorspace);
handle = colorspace.Handle;
weak = new WeakReference(colorspace);
Assert.Equal(1, handle.GetReferenceCount(true));
var info = new SKImageInfo(100, 100, SKImageInfo.PlatformColorType, SKAlphaType.Premul, colorspace);
Assert.Equal(1, handle.GetReferenceCount(true));
var image = SKImage.Create(info);
Assert.Equal(2, handle.GetReferenceCount(true));
return(image);
}
}