public void Save(string filename, SkiaSharp.SKEncodedImageFormat format)
{
if (Disposed)
{
return;
}
SkiaSharp.SKBitmap bitmap = new SkiaSharp.SKBitmap(this.Width, this.Height, false);
int w = Width;
int h = Height;
var colorPtr = this.GetColors();
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
var col = *(colorPtr + x + (h - 1 - y) * h);
bitmap.SetPixel(x, y, new SkiaSharp.SKColor(col.R, col.G, col.B, col.A));
}
}
var img = SkiaSharp.SKImage.FromBitmap(bitmap);
var data = img.Encode(format, 100);
System.IO.File.WriteAllBytes(filename, data.ToArray());
img.Dispose();
bitmap.Dispose();
}
public static SKBitmap FromImage(SKImage image)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
var info = new SKImageInfo(image.Width, image.Height, SKImageInfo.PlatformColorType, image.AlphaType);
var bmp = new SKBitmap(info);
if (!image.ReadPixels(info, bmp.GetPixels(), info.RowBytes, 0, 0))
{
bmp.Dispose();
bmp = null;
}
return(bmp);
}
public static SKBitmap Decode(SKCodec codec, SKImageInfo bitmapInfo)
{
if (codec == null)
{
throw new ArgumentNullException(nameof(codec));
}
var bitmap = new SKBitmap(bitmapInfo);
var result = codec.GetPixels(bitmapInfo, bitmap.GetPixels(out var length));
if (result != SKCodecResult.Success && result != SKCodecResult.IncompleteInput)
{
bitmap.Dispose();
bitmap = null;
}
return(bitmap);
}
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 SKBitmap Decode (SKCodec codec, SKImageInfo bitmapInfo)
{
if (codec == null) {
throw new ArgumentNullException (nameof (codec));
}
// construct a color table for the decode if necessary
SKColorTable colorTable = null;
int colorCount = 0;
if (bitmapInfo.ColorType == SKColorType.Index8)
{
colorTable = new SKColorTable ();
}
// read the pixels and color table
var bitmap = new SKBitmap (bitmapInfo, colorTable);
IntPtr length;
var result = codec.GetPixels (bitmapInfo, bitmap.GetPixels (out length), colorTable, ref colorCount);
if (result != SKCodecResult.Success && result != SKCodecResult.IncompleteInput) {
bitmap.Dispose ();
bitmap = null;
}
return bitmap;
}
public SKBitmap Copy (SKColorType colorType)
{
var destination = new SKBitmap ();
if (!SkiaApi.sk_bitmap_copy (Handle, destination.Handle, colorType)) {
destination.Dispose ();
destination = null;
}
return destination;
}
private static Image ExtractBestImageFromIco(byte[] pb)
{
List <GfxImage> l = UnpackIco(pb);
if ((l == null) || (l.Count == 0))
{
return(null);
}
long qMax = 0;
foreach (GfxImage gi in l)
{
if (gi.Width == 0)
{
gi.Width = 256;
}
if (gi.Height == 0)
{
gi.Height = 256;
}
qMax = Math.Max(qMax, (long)gi.Width * (long)gi.Height);
}
byte[] pbHdrPng = new byte[] {
0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A
};
byte[] pbHdrJpeg = new byte[] { 0xFF, 0xD8, 0xFF };
Image imgBest = null;
int bppBest = -1;
foreach (GfxImage gi in l)
{
if (((long)gi.Width * (long)gi.Height) < qMax)
{
continue;
}
byte[] pbImg = gi.Data;
Image img = null;
try
{
if ((pbImg.Length > pbHdrPng.Length) &&
MemUtil.ArraysEqual(pbHdrPng,
MemUtil.Mid <byte>(pbImg, 0, pbHdrPng.Length)))
{
img = GfxUtil.LoadImage(pbImg);
}
else if ((pbImg.Length > pbHdrJpeg.Length) &&
MemUtil.ArraysEqual(pbHdrJpeg,
MemUtil.Mid <byte>(pbImg, 0, pbHdrJpeg.Length)))
{
img = GfxUtil.LoadImage(pbImg);
}
else
{
using (MemoryStream ms = new MemoryStream(pb, false))
{
using (Icon ico = new Icon(ms, gi.Width, gi.Height))
{
img = ico.ToBitmap();
}
}
}
}
catch (Exception) { Debug.Assert(false); }
if (img == null)
{
continue;
}
if ((img.Width < gi.Width) || (img.Height < gi.Height))
{
Debug.Assert(false);
img.Dispose();
continue;
}
int bpp = GetBitsPerPixel(img.PixelFormat);
if (bpp > bppBest)
{
if (imgBest != null)
{
imgBest.Dispose();
}
imgBest = img;
bppBest = bpp;
}
else
{
img.Dispose();
}
}
return(imgBest);
}
