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100 lines
No EOL
3.6 KiB
C#
100 lines
No EOL
3.6 KiB
C#
#region License Information (GPL v3)
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/*
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ShareX - A program that allows you to take screenshots and share any file type
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Copyright (c) 2007-2019 ShareX Team
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Optionally you can also view the license at <http://www.gnu.org/licenses/>.
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*/
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#endregion License Information (GPL v3)
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using System;
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using System.Drawing;
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using System.Drawing.Imaging;
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using System.Windows.Forms;
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namespace ShareX.HelpersLib
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{
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public class LayeredForm : Form
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{
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public LayeredForm()
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{
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SuspendLayout();
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AutoScaleDimensions = new SizeF(6F, 13F);
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AutoScaleMode = AutoScaleMode.Font;
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ClientSize = new Size(300, 300);
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FormBorderStyle = FormBorderStyle.None;
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Icon = ShareXResources.Icon;
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Name = "LayeredForm";
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ShowInTaskbar = false;
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Text = "LayeredForm";
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TopMost = true;
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ResumeLayout(false);
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}
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protected override CreateParams CreateParams
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{
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get
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{
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CreateParams createParams = base.CreateParams;
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createParams.ExStyle |= (int)WindowStyles.WS_EX_LAYERED;
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return createParams;
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}
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}
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public void SelectBitmap(Bitmap bitmap, int opacity = 255)
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{
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if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
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{
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throw new ApplicationException("The bitmap must be 32bpp with alpha-channel.");
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}
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IntPtr screenDc = NativeMethods.GetDC(IntPtr.Zero);
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IntPtr memDc = NativeMethods.CreateCompatibleDC(screenDc);
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IntPtr hBitmap = IntPtr.Zero;
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IntPtr hOldBitmap = IntPtr.Zero;
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try
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{
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hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
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hOldBitmap = NativeMethods.SelectObject(memDc, hBitmap);
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SIZE newSize = new SIZE(bitmap.Width, bitmap.Height);
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POINT sourceLocation = new POINT(0, 0);
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POINT newLocation = new POINT(Left, Top);
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BLENDFUNCTION blend = new BLENDFUNCTION();
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blend.BlendOp = NativeConstants.AC_SRC_OVER;
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blend.BlendFlags = 0;
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blend.SourceConstantAlpha = (byte)opacity;
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blend.AlphaFormat = NativeConstants.AC_SRC_ALPHA;
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NativeMethods.UpdateLayeredWindow(Handle, screenDc, ref newLocation, ref newSize, memDc, ref sourceLocation, 0, ref blend, NativeConstants.ULW_ALPHA);
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}
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finally
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{
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NativeMethods.ReleaseDC(IntPtr.Zero, screenDc);
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if (hBitmap != IntPtr.Zero)
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{
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NativeMethods.SelectObject(memDc, hOldBitmap);
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NativeMethods.DeleteObject(hBitmap);
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}
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NativeMethods.DeleteDC(memDc);
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}
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}
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}
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} |