private static SKBitmap CreateLabelAsBitmap(LabelStyle style, string text, SKPaint paint)
{
var rect = new SKRect();
paint.MeasureText(text, ref rect);
var backRect = new SKRect(0, 0, rect.Width + 6, rect.Height + 6);
var bitmap = new SKBitmap((int)backRect.Width, (int)backRect.Height);
using (var target = new SKCanvas(bitmap))
{
target.Clear();
DrawBackground(style, backRect, target);
target.DrawText(text, -rect.Left + 3, -rect.Top +3, paint);
return bitmap;
}
}
public static void DilateImageFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
using (var filter = SKImageFilter.CreateDilate(5, 5))
using (var paint = new SKPaint())
{
paint.ImageFilter = filter;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
public static void ColorTableColorFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
var ct = new byte[256];
for (int i = 0; i < 256; ++i)
{
var x = (i - 96) * 255 / 64;
ct[i] = x < 0 ? (byte)0 : x > 255 ? (byte)255 : (byte)x;
}
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
using (var cf = SKColorFilter.CreateTable(null, ct, ct, ct))
using (var paint = new SKPaint())
{
paint.ColorFilter = cf;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
public static void ColorMatrixColorFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
{
var f = new Action<SKRect, float[]>((rect, colorMatrix) =>
{
using (var cf = SKColorFilter.CreateColorMatrix(colorMatrix))
using (var paint = new SKPaint())
{
paint.ColorFilter = cf;
canvas.DrawBitmap(bitmap, rect, paint);
}
});
var colorMatrix1 = new float[20] {
0f, 1f, 0f, 0f, 0f,
0f, 0f, 1f, 0f, 0f,
1f, 0f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var grayscale = new float[20] {
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var colorMatrix3 = new float[20] {
-1f, 1f, 1f, 0f, 0f,
1f, -1f, 1f, 0f, 0f,
1f, 1f, -1f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var colorMatrix4 = new float[20] {
0.0f, 0.5f, 0.5f, 0f, 0f,
0.5f, 0.0f, 0.5f, 0f, 0f,
0.5f, 0.5f, 0.0f, 0f, 0f,
0.0f, 0.0f, 0.0f, 1f, 0f
};
var highContrast = new float[20] {
4.0f, 0.0f, 0.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 4.0f, 0.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 0.0f, 4.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var colorMatrix6 = new float[20] {
0f, 0f, 1f, 0f, 0f,
1f, 0f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var sepia = new float[20] {
0.393f, 0.769f, 0.189f, 0.0f, 0.0f,
0.349f, 0.686f, 0.168f, 0.0f, 0.0f,
0.272f, 0.534f, 0.131f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var inverter = new float[20] {
-1f, 0f, 0f, 0f, 255f,
0f, -1f, 0f, 0f, 255f,
0f, 0f, -1f, 0f, 255f,
0f, 0f, 0f, 1f, 0f
};
var matices = new[] {
colorMatrix1, grayscale, highContrast, sepia,
colorMatrix3, colorMatrix4, colorMatrix6, inverter
};
var cols = width < height ? 2 : 4;
var rows = (matices.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
for (int y = 0; y < rows; y++)
{
for (int x = 0; x < cols; x++)
{
f(SKRect.Create(x * w, y * h, w, h), matices[y * cols + x]);
}
}
}
}
public static void TurbulencePerlinNoiseShader(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
using (var shader = SKShader.CreatePerlinNoiseTurbulence(0.05f, 0.05f, 4, 0.0f))
using (var paint = new SKPaint())
{
paint.Shader = shader;
canvas.DrawPaint(paint);
}
}
public static void BitmapDecoder(SKCanvas canvas, int width, int height)
{
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".color-wheel.png";
canvas.Clear(SKColors.White);
// load the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var codec = SKCodec.Create(stream))
using (var paint = new SKPaint())
using (var tf = SKTypeface.FromFamilyName("Arial"))
{
var info = codec.Info;
paint.IsAntialias = true;
paint.TextSize = 14;
paint.Typeface = tf;
paint.Color = SKColors.Black;
// decode the image
using (var bitmap = new SKBitmap(info.Width, info.Height, info.ColorType, info.IsOpaque ? SKAlphaType.Opaque : SKAlphaType.Premul))
{
IntPtr length;
var result = codec.GetPixels(bitmap.Info, bitmap.GetPixels(out length));
if (result == SKCodecResult.Success || result == SKCodecResult.IncompleteInput)
{
var x = 25;
var y = 25;
canvas.DrawBitmap(bitmap, x, y);
x += bitmap.Info.Width + 25;
y += 14;
canvas.DrawText(string.Format("Result: {0}", result), x, y, paint);
y += 20;
canvas.DrawText(string.Format("Size: {0}px x {1}px", bitmap.Width, bitmap.Height), x, y, paint);
y += 20;
canvas.DrawText(string.Format("Pixels: {0} @ {1}b/px", bitmap.Pixels.Length, bitmap.BytesPerPixel), x, y, paint);
}
}
}
}
public void Clear(Color color) => _canvas.Clear(color.ToSkia());
public static void ColorMatrixColorFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
{
var f = new Action <SKRect, float[]>((rect, colorMatrix) =>
{
using (var cf = SKColorFilter.CreateColorMatrix(colorMatrix))
using (var paint = new SKPaint())
{
paint.ColorFilter = cf;
canvas.DrawBitmap(bitmap, rect, paint);
}
});
var colorMatrix1 = new float[20] {
0f, 1f, 0f, 0f, 0f,
0f, 0f, 1f, 0f, 0f,
1f, 0f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var grayscale = new float[20] {
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.21f, 0.72f, 0.07f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var colorMatrix3 = new float[20] {
-1f, 1f, 1f, 0f, 0f,
1f, -1f, 1f, 0f, 0f,
1f, 1f, -1f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var colorMatrix4 = new float[20] {
0.0f, 0.5f, 0.5f, 0f, 0f,
0.5f, 0.0f, 0.5f, 0f, 0f,
0.5f, 0.5f, 0.0f, 0f, 0f,
0.0f, 0.0f, 0.0f, 1f, 0f
};
var highContrast = new float[20] {
4.0f, 0.0f, 0.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 4.0f, 0.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 0.0f, 4.0f, 0.0f, -4.0f * 255f / (4.0f - 1f),
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var colorMatrix6 = new float[20] {
0f, 0f, 1f, 0f, 0f,
1f, 0f, 0f, 0f, 0f,
0f, 1f, 0f, 0f, 0f,
0f, 0f, 0f, 1f, 0f
};
var sepia = new float[20] {
0.393f, 0.769f, 0.189f, 0.0f, 0.0f,
0.349f, 0.686f, 0.168f, 0.0f, 0.0f,
0.272f, 0.534f, 0.131f, 0.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f, 0.0f
};
var inverter = new float[20] {
-1f, 0f, 0f, 0f, 255f,
0f, -1f, 0f, 0f, 255f,
0f, 0f, -1f, 0f, 255f,
0f, 0f, 0f, 1f, 0f
};
var matices = new[] {
colorMatrix1, grayscale, highContrast, sepia,
colorMatrix3, colorMatrix4, colorMatrix6, inverter
};
var cols = width < height ? 2 : 4;
var rows = (matices.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
for (int y = 0; y < rows; y++)
{
for (int x = 0; x < cols; x++)
{
f(SKRect.Create(x * w, y * h, w, h), matices[y * cols + x]);
}
}
}
}
public static void Xfermode (SKCanvas canvas, int width, int height)
{
var modes = Enum.GetValues (typeof(SKXferMode)).Cast<SKXferMode> ().ToArray ();
var cols = width < height ? 3 : 5;
var rows = (modes.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
var rect = SKRect.Create (w, h);
var srcPoints = new[] {
new SKPoint (0.0f, 0.0f),
new SKPoint (w, 0.0f)
};
var srcColors = new [] {
SKColors.Magenta.WithAlpha (0),
SKColors.Magenta
};
var dstPoints = new [] {
new SKPoint (0.0f, 0.0f),
new SKPoint (0.0f, h)
};
var dstColors = new [] {
SKColors.Cyan.WithAlpha (0),
SKColors.Cyan
};
using (var text = new SKPaint ())
using (var stroke = new SKPaint ())
using (var src = new SKPaint ())
using (var dst = new SKPaint ())
using (var srcShader = SKShader.CreateLinearGradient (srcPoints [0], srcPoints [1], srcColors, null, SKShaderTileMode.Clamp))
using (var dstShader = SKShader.CreateLinearGradient (dstPoints [0], dstPoints [1], dstColors, null, SKShaderTileMode.Clamp)) {
text.TextSize = 12.0f;
text.IsAntialias = true;
text.TextAlign = SKTextAlign.Center;
stroke.IsStroke = true;
src.Shader = srcShader;
dst.Shader = dstShader;
canvas.Clear (SKColors.White);
for (var i = 0; i < modes.Length; ++i) {
using (new SKAutoCanvasRestore (canvas, true)) {
canvas.Translate (w * (i / rows), h * (i % rows));
canvas.ClipRect (rect);
canvas.DrawColor (SKColors.LightGray);
canvas.SaveLayer (null);
canvas.Clear (SKColors.Transparent);
canvas.DrawPaint (dst);
src.XferMode = modes [i];
canvas.DrawPaint (src);
canvas.DrawRect (rect, stroke);
var desc = modes [i].ToString ();
canvas.DrawText (desc, w / 2f, h / 2f, text);
}
}
}
}
public static void CustomFonts (SKCanvas canvas, int width, int height)
{
string text = "\u03A3 and \u0750";
using (var paint = new SKPaint ()) {
canvas.Clear (SKColors.White);
paint.IsAntialias = true;
using (var tf = SKTypeface.FromFile (CustomFontPath)) {
paint.Color = XamGreen;
paint.TextSize = 40;
paint.Typeface = tf;
canvas.DrawText (text, 50, 50, paint);
}
using (var stream = new SKFileStream (CustomFontPath))
using (var tf = SKTypeface.FromStream (stream)) {
paint.Color = XamDkBlue;
paint.TextSize = 40;
paint.Typeface = tf;
canvas.DrawText (text, 50, 100, paint);
}
var assembly = typeof(Demos).GetTypeInfo ().Assembly;
var fontName = assembly.GetName ().Name + ".embedded-font.ttf";
using (var resource = assembly.GetManifestResourceStream (fontName))
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 = XamLtBlue;
paint.TextSize = 40;
paint.Typeface = tf;
canvas.DrawText (text, 50, 150, paint);
}
}
using (var resource = assembly.GetManifestResourceStream (fontName))
using (var stream = new SKManagedStream (resource))
using (var tf = SKTypeface.FromStream (stream)) {
paint.Color = XamPurple;
paint.TextSize = 40;
paint.Typeface = tf;
canvas.DrawText (text, 50, 200, paint);
}
}
}
public static void ManageDrawMatrix (SKCanvas canvas, int width, int height)
{
var size = ((float)height > width ? width : height) * 0.5f;
var center = new SKPoint ((width - size) / 2f, (height - size) / 2f);
// draw these at specific locations
var leftRect = SKRect.Create (center.X - size / 2f, center.Y, size, size);
var rightRect = SKRect.Create (center.X + size / 2f, center.Y, size, size);
// draw this at the current location / transformation
var rotatedRect = SKRect.Create (0f, 0f, size, size);
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
canvas.Clear (XamPurple);
// draw
paint.Color = XamDkBlue;
canvas.DrawRect (leftRect, paint);
// save
canvas.Save();
// transform
canvas.Translate (width / 2f, center.Y);
canvas.RotateDegrees (45);
// draw
paint.Color = XamGreen;
canvas.DrawRect (rotatedRect, paint);
// undo transform / restore
canvas.Restore();
// draw
paint.Color = XamLtBlue;
canvas.DrawRect (rightRect, paint);
}
}
public static void FilledHeptagram (SKCanvas canvas, int width, int height)
{
var size = ((float)height > width ? width : height) * 0.75f;
var R = 0.45f * size;
var TAU = 6.2831853f;
using (var path = new SKPath ()) {
path.MoveTo (R, 0.0f);
for (int i = 1; i < 7; ++i) {
var theta = 3f * i * TAU / 7f;
path.LineTo (R * (float)Math.Cos (theta), R * (float)Math.Sin (theta));
}
path.Close ();
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
canvas.Clear (SKColors.White);
canvas.Translate (width / 2f, height / 2f);
canvas.DrawPath (path, paint);
}
}
}
public static void PathEffects (SKCanvas canvas, int width, int height)
{
canvas.Clear (SKColors.White);
var step = height / 4;
using (var paint = new SKPaint ())
using (var effect = SKPathEffect.CreateDash (new [] { 15f, 5f }, 0)) {
paint.IsStroke = true;
paint.StrokeWidth = 4;
paint.PathEffect = effect;
canvas.DrawLine (10, step, width - 10 - 10, step, paint);
}
using (var paint = new SKPaint ())
using (var effect = SKPathEffect.CreateDiscrete (10, 10)) {
paint.IsStroke = true;
paint.StrokeWidth = 4;
paint.PathEffect = effect;
canvas.DrawLine (10, step * 2, width - 10 - 10, step * 2, paint);
}
using (var paint = new SKPaint ())
using (var dashEffect = SKPathEffect.CreateDash (new [] { 15f, 5f }, 0))
using (var discreteEffect = SKPathEffect.CreateDiscrete (10, 10))
using (var effect = SKPathEffect.CreateCompose (dashEffect, discreteEffect)) {
paint.IsStroke = true;
paint.StrokeWidth = 4;
paint.PathEffect = effect;
canvas.DrawLine (10, step * 3, width - 10 - 10, step * 3, paint);
}
}
public static void CreatePdfSample (SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
using (var paint = new SKPaint ()) {
paint.TextSize = 24.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0x9C, 0xAF, 0xB7);
paint.StrokeWidth = 3;
paint.TextAlign = SKTextAlign.Center;
canvas.DrawText ("tap to open", width / 2f, 100f, paint);
}
using (var stream = new SKFileWStream (Path.Combine (WorkingDirectory, "document.pdf")))
using (var document = SKDocument.CreatePdf (stream))
using (var pdfCanvas = document.BeginPage (width, height))
using (var paint = new SKPaint ()) {
paint.TextSize = 64.0f;
paint.IsAntialias = true;
paint.Color = new SKColor (0x9C, 0xAF, 0xB7);
paint.IsStroke = true;
paint.StrokeWidth = 3;
paint.TextAlign = SKTextAlign.Center;
pdfCanvas.DrawText ("...PDF...", width / 2f, 100f, paint);
document.EndPage ();
document.Close ();
}
}
public static void ChainedImageFilter(SKCanvas canvas, int width, int height)
{
canvas.Clear(SKColors.White);
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".baboon.png";
var size = width > height ? height : width;
var small = size / 5;
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var bitmap = SKBitmap.Decode(stream))
using (var filterMag = SKImageFilter.CreateMagnifier(SKRect.Create(small*2, small*2, small*3, small*3), small))
using (var filterBlur = SKImageFilter.CreateBlur(5, 5, filterMag))
using (var paint = new SKPaint())
{
paint.ImageFilter = filterBlur;
canvas.DrawBitmap(bitmap, SKRect.Create(width, height), paint);
}
}
public static void Xfermode(SKCanvas canvas, int width, int height)
{
var modes = Enum.GetValues(typeof(SKXferMode)).Cast <SKXferMode> ().ToArray();
var cols = width < height ? 3 : 5;
var rows = (modes.Length - 1) / cols + 1;
var w = (float)width / cols;
var h = (float)height / rows;
var rect = SKRect.Create(w, h);
var srcPoints = new[] {
new SKPoint(0.0f, 0.0f),
new SKPoint(w, 0.0f)
};
var srcColors = new [] {
SKColors.Magenta.WithAlpha(0),
SKColors.Magenta
};
var dstPoints = new [] {
new SKPoint(0.0f, 0.0f),
new SKPoint(0.0f, h)
};
var dstColors = new [] {
SKColors.Cyan.WithAlpha(0),
SKColors.Cyan
};
using (var text = new SKPaint())
using (var stroke = new SKPaint())
using (var src = new SKPaint())
using (var dst = new SKPaint())
using (var srcShader = SKShader.CreateLinearGradient(srcPoints [0], srcPoints [1], srcColors, null, SKShaderTileMode.Clamp))
using (var dstShader = SKShader.CreateLinearGradient(dstPoints [0], dstPoints [1], dstColors, null, SKShaderTileMode.Clamp)) {
text.TextSize = 12.0f;
text.IsAntialias = true;
text.TextAlign = SKTextAlign.Center;
stroke.IsStroke = true;
src.Shader = srcShader;
dst.Shader = dstShader;
canvas.Clear(SKColors.White);
for (var i = 0; i < modes.Length; ++i)
{
using (new SKAutoCanvasRestore(canvas, true)) {
canvas.Translate(w * (i / rows), h * (i % rows));
canvas.ClipRect(rect);
canvas.DrawColor(SKColors.LightGray);
canvas.SaveLayer(null);
canvas.Clear(SKColors.Transparent);
canvas.DrawPaint(dst);
src.XferMode = modes [i];
canvas.DrawPaint(src);
canvas.DrawRect(rect, stroke);
var desc = modes [i].ToString();
canvas.DrawText(desc, w / 2f, h / 2f, text);
}
}
}
}
public static void BitmapShader (SKCanvas canvas, int width, int height)
{
var assembly = typeof(Demos).GetTypeInfo ().Assembly;
var imageName = assembly.GetName ().Name + ".color-wheel.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream (imageName))
using (var stream = new SKManagedStream(resource))
using (var source = SKBitmap.Decode (stream)) {
// create the shader and paint
//SkMatrix matrix;
//matrix.setScale(0.75f, 0.75f);
//matrix.preRotate(30.0f);
var matrix = SKMatrix.MakeRotation (30.0f);
using (var shader = SKShader.CreateBitmap (source, SKShaderTileMode.Repeat, SKShaderTileMode.Repeat, matrix))
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
paint.Shader = shader;
// tile the bitmap
canvas.Clear (SKColors.White);
canvas.DrawPaint (paint);
}
}
}
public static void BitmapShaderManipulated (SKCanvas canvas, int width, int height)
{
var assembly = typeof(Demos).GetTypeInfo ().Assembly;
var imageName = assembly.GetName ().Name + ".color-wheel.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream (imageName))
using (var stream = new SKManagedStream(resource))
using (var source = SKBitmap.Decode (stream)) {
// invert the pixels
var pixels = source.Pixels;
for (int i = 0; i < pixels.Length; i++) {
pixels[i] = new SKColor (
(byte)(255 - pixels [i].Red),
(byte)(255 - pixels [i].Green),
(byte)(255 - pixels [i].Blue),
pixels [i].Alpha);
}
source.Pixels = pixels;
using (var shader = SKShader.CreateBitmap (source, SKShaderTileMode.Repeat, SKShaderTileMode.Repeat))
using (var paint = new SKPaint ()) {
paint.IsAntialias = true;
paint.Shader = shader;
// tile the bitmap
canvas.Clear (SKColors.White);
canvas.DrawPaint (paint);
}
}
}
public static void BitmapDecoder(SKCanvas canvas, int width, int height)
{
var assembly = typeof(Demos).GetTypeInfo().Assembly;
var imageName = assembly.GetName().Name + ".color-wheel.png";
canvas.Clear(SKColors.White);
// load the embedded resource stream
using (var resource = assembly.GetManifestResourceStream(imageName))
using (var stream = new SKManagedStream(resource))
using (var decoder = new SKImageDecoder(stream))
using (var paint = new SKPaint())
using (var tf = SKTypeface.FromFamilyName("Arial"))
{
paint.IsAntialias = true;
paint.TextSize = 14;
paint.Typeface = tf;
paint.Color = SKColors.Black;
// read / set decoder settings
decoder.DitherImage = true;
decoder.PreferQualityOverSpeed = true;
decoder.SampleSize = 2;
// decode the image
using (var bitmap = new SKBitmap())
{
var result = decoder.Decode(stream, bitmap);
if (result != SKImageDecoderResult.Failure)
{
var info = bitmap.Info;
var x = 25;
var y = 25;
canvas.DrawBitmap(bitmap, x, y);
x += info.Width + 25;
y += 14;
canvas.DrawText(string.Format("Result: {0}", result), x, y, paint);
y += 20;
canvas.DrawText(string.Format("Size: {0}px x {1}px", bitmap.Width, bitmap.Height), x, y, paint);
y += 20;
canvas.DrawText(string.Format("Pixels: {0} @ {1}b/px", bitmap.Pixels.Length, bitmap.BytesPerPixel), x, y, paint);
}
}
}
}
public DrawingContextImpl(SKCanvas canvas)
{
Canvas = canvas;
Canvas.Clear();
}
public static void BitmapLattice (SKCanvas canvas, int width, int height)
{
canvas.Clear (SKColors.White);
var assembly = typeof (Demos).GetTypeInfo ().Assembly;
var imageName = assembly.GetName ().Name + ".nine-patch.png";
// load the image from the embedded resource stream
using (var resource = assembly.GetManifestResourceStream (imageName))
using (var stream = new SKManagedStream (resource))
using (var bitmap = SKBitmap.Decode (stream))
{
var patchCenter = new SKRectI (33, 33, 256 - 33, 256 - 33);
// 2x3 for portrait, or 3x2 for landscape
var land = width > height;
var min = land ? Math.Min (width / 3f, height / 2f) : Math.Min (width / 2f, height / 3f);
var wide = SKRect.Inflate (SKRect.Create (0, land ? min : (min * 2f), min * 2f, min), -6, -6);
var tall = SKRect.Inflate (SKRect.Create (land ? (min * 2f) : min, 0, min, min * 2f), -6, -6);
var square = SKRect.Inflate (SKRect.Create (0, 0, min, min), -6, -6);
var text = SKRect.Create (land ? min : 0, land ? 0 : min, min, min / 5f);
text.Offset (text.Width / 2f, text.Height * 1.5f);
text.Right = text.Left;
// draw the bitmaps
canvas.DrawBitmapNinePatch (bitmap, patchCenter, square);
canvas.DrawBitmapNinePatch (bitmap, patchCenter, tall);
canvas.DrawBitmapNinePatch (bitmap, patchCenter, wide);
// describe what we see
using (var paint = new SKPaint ())
{
paint.TextAlign = SKTextAlign.Center;
paint.TextSize = text.Height * 0.75f;
canvas.DrawText ("The corners", text.Left, text.Top, paint);
text.Offset (0, text.Height);
canvas.DrawText ("should always", text.Left, text.Top, paint);
text.Offset (0, text.Height);
canvas.DrawText ("be square", text.Left, text.Top, paint);
}
}
}