|
public static Decode ( |
||
| codec | ||
| return | ||
public static Image LoadImage(byte[] pb)
{
if (pb == null)
{
return(null);
}
using (var ms = new MemoryStream(pb, false))
{
return(Image.Decode(ms));
}
}
public BitmapHelper(string path)
{
Bitmap bitmap;
try
{
bitmap = Bitmap.Decode(File.OpenRead(path));
}
catch (Exception)
{
bitmap = new Bitmap(10, 10);
for (int i = 0; i < 10; i++)
{
for (int w = 0; w < 10; w++)
{
bitmap.SetPixel(i, w, SKColors.White);
}
}
}
IntPtr ptr = bitmap.GetPixels();
int bytes = Math.Abs(bitmap.RowBytes) * bitmap.Height;
byte[] rgbValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);
colors = new SKColor[bitmap.Width, bitmap.Height];
for (int counter = 0; counter < rgbValues.Length; counter += 4)
{
int i_am = counter / 4;
colors[i_am % bitmap.Width, i_am / bitmap.Width]
=
new SKColor(
rgbValues[counter + 2],
rgbValues[counter + 1],
rgbValues[counter + 0],
rgbValues[counter + 3]);
}
bitmap.Dispose();
}
public static void MagnifierImageFilter(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 filter = SKImageFilter.CreateMagnifier(SKRect.Create(small * 2, small * 2, small * 3, small * 3), small))
using (var paint = new SKPaint())
{
paint.ImageFilter = filter;
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]);
}
}
}
}
