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ScreenshotToClipboardScript.cs
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ScreenshotToClipboardScript.cs
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using AtgScriptsExtension.Extensions;
using AtgScriptsExtension.Helpers;
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows.Forms;
using static libmpv;
namespace AtgScriptsExtension
{
public class ScreenshotToClipboardScript : MpvNetScriptBase
{
private const string scrRawCommand = "screenshot-raw";
private Bitmap m_bmp;
private string m_errorMessage = string.Empty;
private bool m_IsCbThreadSucceded = false;
public ScreenshotToClipboardScript(string name) : base(name)
{
MessageReceived = OnMessageReceived;
}
public bool TryScreenshotToClipboard(string flags = "")
{
bool res = false;
try
{
ScreenshotToClipboard(flags);
res = true;
}
catch (Exception ex)
{
SetErrorMessage(ex);
}
finally
{
m_bmp?.Dispose();
m_bmp = null;
}
return res;
}
private void SetErrorMessage(Exception ex, string msgHeader = "")
{
string h = string.IsNullOrEmpty(msgHeader) ? "" : msgHeader + '\n';
m_errorMessage = $"{h}{ex.GetType().Name}: {ex.Message}\nAt: {ex.TargetSite}";
}
private void OnMessageReceived(string[] args)
{
var flags = "";
if (args.Length > 0)
{
flags = args[0];
}
string text = "Copy Screenshot to clipboard";
m_core.CommandV("show-text", text);
string duration = m_core.GetPropertyOsdString("osd-duration");
if (TryScreenshotToClipboard(flags) && m_IsCbThreadSucceded)
{
text += ": Succeded";
}
else
{
text += ": Failed";
if (!string.IsNullOrEmpty(m_errorMessage))
{
text += '\n' + m_errorMessage;
duration = "5000";
}
}
m_errorMessage = "";
m_core.CommandV("show-text", text, duration);
}
private void ScreenshotToClipboard(string flags = "")
{
GetRawScreenshot(out m_bmp, flags);
var thread = new Thread(() =>
{
try
{
Clipboard.SetImage(m_bmp); // need to be done in STA thread
m_IsCbThreadSucceded = true;
}
catch (Exception ex)
{
m_IsCbThreadSucceded = false;
SetErrorMessage(ex);
}
});
thread.SetApartmentState(ApartmentState.STA);
thread.Start();
thread.Join();
}
[DllImport("mpv-2.dll")]
internal static extern int mpv_command_node(IntPtr ctx, IntPtr args, IntPtr result);
unsafe private void GetRawScreenshot(out Bitmap bmp, string flags = "")
{
const int flagsMaxLen = 256;
if ((flags?.Length + 1) > flagsMaxLen) throw new ArgumentException($"Flags argument is too large (> {flagsMaxLen})");
bool hasFlags = !string.IsNullOrEmpty(flags);
var argsNodeListFlagsVal = new mpv_node
{
format = mpv_format.MPV_FORMAT_STRING
};
if (hasFlags)
{
byte* flagsPtr = stackalloc byte[flags.Length + 1];
MarHelper.CopyStrToByteStrBuff(flags, flagsPtr);
argsNodeListFlagsVal.str = (IntPtr)flagsPtr;
}
var argsNodeListCmdVal = new mpv_node
{
format = mpv_format.MPV_FORMAT_STRING
};
byte* cmdPtr = stackalloc byte[scrRawCommand.Length + 1];
MarHelper.CopyStrToByteStrBuff(scrRawCommand, cmdPtr);
argsNodeListCmdVal.str = (IntPtr)cmdPtr;
// adding command and flags to args Node
var argsNodeList = new mpv_node_list();
int argsLen = hasFlags ? 2 : 1;
var listValSize = Marshal.SizeOf(argsNodeListCmdVal);
var lvPtr = stackalloc byte[listValSize * argsLen];
var listValPtr = (IntPtr)lvPtr;
Marshal.StructureToPtr(argsNodeListCmdVal, listValPtr, false);
if (hasFlags)
{
Marshal.StructureToPtr(argsNodeListFlagsVal, listValPtr + listValSize, false);
}
argsNodeList.values = listValPtr;
var argsNode = new mpv_node
{
format = mpv_format.MPV_FORMAT_NODE_ARRAY
};
var listPtr = stackalloc byte[Marshal.SizeOf(argsNodeList)];
argsNodeList.num = argsLen;
argsNode.list = (IntPtr)listPtr;
Marshal.StructureToPtr(argsNodeList, (IntPtr)listPtr, false);
var argsPtr = stackalloc byte[Marshal.SizeOf(argsNode)];
Marshal.StructureToPtr(argsNode, (IntPtr)argsPtr, false);
var resultNode = new mpv_node();
var rPtr = stackalloc byte[Marshal.SizeOf(resultNode)];
var resultPtr = (IntPtr)rPtr;
Marshal.StructureToPtr(resultNode, resultPtr, false);
var res = (mpv_error)mpv_command_node(m_core.Handle, (IntPtr)argsPtr, resultPtr);
if (res != mpv_error.MPV_ERROR_SUCCESS)
{
throw new InvalidOperationException($"Command returned error: {((int)res)} {res}");
}
resultNode = Marshal.PtrToStructure<mpv_node>(resultPtr);
var resultList = Marshal.PtrToStructure<mpv_node_list>(resultNode.list);
GetBitmapFromMpvNodeList(out bmp, resultList);
mpv_free_node_contents(resultPtr);
}
private void GetBitmapFromMpvNodeList(out Bitmap bmp, mpv_node_list list)
{
long w, h, stride;
w = h = stride = 0;
string format = "";
var ba = new mpv_byte_array();
for (int i = 0; i < list.num; i++)
{
int keyOffset = i * IntPtr.Size;
int nodeOffset = i * Marshal.SizeOf<mpv_node>();
var ptrVal = Marshal.ReadInt64(list.keys + keyOffset);
string key = Marshal.PtrToStringAnsi(new IntPtr(ptrVal));
var node = Marshal.PtrToStructure<mpv_node>(list.values + nodeOffset);
switch (key)
{
case "w":
w = node.int64;
break;
case "h":
h = node.int64;
break;
case "stride":
stride = node.int64;
break;
case "format":
format = Marshal.PtrToStringAnsi(node.str) ?? string.Empty;
break;
case "data":
ba = Marshal.PtrToStructure<mpv_byte_array>(node.ba);
break;
default:
break;
}
}
switch (format)
{
case "bgr0":
bmp = new Bitmap((int)w, (int)h, PixelFormat.Format32bppRgb);
bmp.Read32RgbFromPaddedRgb0(stride, ba.data, (long)ba.size.ToUInt64());
break;
default:
throw new ArgumentException($"Unsupported color format: {format}");
}
}
}
}