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Wpf/WinForms: Fix adding transparent images to the clipboard
Ignore Thumbs.db files
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -12,3 +12,4 @@ Source/Components | |
| AppPackages | ||
| packages/ | ||
| .vs/ | ||
| [Tt]humbs.db | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| using System; | ||
| using System.IO; | ||
| using Eto.Drawing; | ||
|
|
||
| namespace Eto | ||
| { | ||
| partial class Win32 | ||
| { | ||
| public static Bitmap FromDIB(MemoryStream ms) | ||
| { | ||
| var header = new byte[40]; | ||
| ms.Read(header, 0, header.Length); | ||
| var size = BitConverter.ToInt32(header, 0); | ||
| var width = BitConverter.ToInt32(header, 4); | ||
| var height = BitConverter.ToInt32(header, 8); | ||
| var bpp = BitConverter.ToInt16(header, 14); | ||
| var compression = BitConverter.ToInt32(header, 16); | ||
| if (size > header.Length) | ||
| ms.Seek(size - header.Length, SeekOrigin.Current); | ||
|
|
||
| if (bpp != 32) | ||
| return null; | ||
| if (compression == 3) // BI_BITFIELDS | ||
| { | ||
| // three dwords, each specifies the bits each RGB components takes | ||
| // we require each takes one byte | ||
| var segments = new byte[sizeof(int) * 3]; | ||
| ms.Read(segments, 0, segments.Length); | ||
| var rcomp = BitConverter.ToInt32(segments, 0); | ||
| var gcomp = BitConverter.ToInt32(segments, 4); | ||
| var bcomp = BitConverter.ToInt32(segments, 8); | ||
| if (rcomp != 0xFF0000 || gcomp != 0xFF00 || bcomp != 0xFF) | ||
| return null; | ||
| } | ||
| else if (compression != 0) // BI_RGB | ||
| return null; | ||
|
|
||
| var bmp = new Bitmap(width, height, PixelFormat.Format32bppRgba); | ||
| using (var bd = bmp.Lock()) | ||
| { | ||
| for (int y = height - 1; y >= 0; y--) | ||
| for (int x = 0; x < width; x++) | ||
| { | ||
| var b = ms.ReadByte(); | ||
| var g = ms.ReadByte(); | ||
| var r = ms.ReadByte(); | ||
| var a = ms.ReadByte(); | ||
| var af = a / 255f; | ||
| if (af > 0) | ||
| bd.SetPixel(x, y, new Color(r / af, g / af, b / af, af)); | ||
| } | ||
| } | ||
| return bmp; | ||
| } | ||
|
|
||
| static void Write(Stream stream, byte[] val) => stream.Write(val, 0, val.Length); | ||
|
|
||
| public static MemoryStream ToDIB(this Bitmap bitmap, int dpi = 96) | ||
| { | ||
| using (var bd = bitmap.Lock()) | ||
| { | ||
| if (bd.BytesPerPixel == 4 || bd.BytesPerPixel == 3) // only 32bpp or 24bpp supported | ||
| { | ||
| var ms = new MemoryStream(bitmap.Width * bitmap.Height * bd.BytesPerPixel + 40); | ||
| // write BITMAPINFOHEADER | ||
| const float InchesPerMeter = 39.37f; | ||
| var pelsPerMeter = Math.Round(dpi * InchesPerMeter); // convert dpi to ppm | ||
| Write(ms, BitConverter.GetBytes((uint)40)); // biSize | ||
| Write(ms, BitConverter.GetBytes((uint)bitmap.Width)); // biWidth | ||
| Write(ms, BitConverter.GetBytes((uint)bitmap.Height));// biHeight | ||
| Write(ms, BitConverter.GetBytes((ushort)1)); // biPlanes | ||
| Write(ms, BitConverter.GetBytes((ushort)bd.BitsPerPixel)); // biBitCount | ||
| Write(ms, BitConverter.GetBytes((uint)0)); // biCompression (BI_RGB, uncompressed) | ||
| Write(ms, BitConverter.GetBytes((uint)0)); // biSizeImage | ||
| Write(ms, BitConverter.GetBytes((uint)pelsPerMeter)); // biXPelsPerMeter | ||
| Write(ms, BitConverter.GetBytes((uint)pelsPerMeter)); // biYPelsPerMeter | ||
| Write(ms, BitConverter.GetBytes((uint)0)); // biClrUsed | ||
| Write(ms, BitConverter.GetBytes((uint)0)); // biClrImportant | ||
|
|
||
| var hasAlpha = bd.BytesPerPixel == 4; | ||
| // write RGB data, dibs are flipped vertically | ||
| for (int y = bitmap.Height - 1; y >= 0; y--) | ||
| { | ||
| for (int x = 0; x < bitmap.Width; x++) | ||
| { | ||
| var p = bd.GetPixel(x, y); | ||
| // need to write RGB premultiplied by alpha (and round up) | ||
| ms.WriteByte((byte)(p.B * p.A * 255f + .5f)); | ||
| ms.WriteByte((byte)(p.G * p.A * 255f + .5f)); | ||
| ms.WriteByte((byte)(p.R * p.A * 255f + .5f)); | ||
| if (hasAlpha) | ||
| ms.WriteByte((byte)p.Ab); | ||
| } | ||
| } | ||
|
|
||
| ms.Position = 0; | ||
| return ms; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
| } | ||
| } |