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Program.vb
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Program.vb
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#Region "Copyright"
' Copyright © 2024, TeamDev. All rights reserved.
'
' Redistribution and use in source and/or binary forms, with or without
' modification, must retain the above copyright notice and the following
' disclaimer.
'
' THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
' "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
' LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
' A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
' OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
' SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
' LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
' DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
' THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
' (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
' OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#End Region
Imports System
Imports System.IO
Imports System.Linq
Imports System.Runtime.InteropServices
Imports DotNetBrowser.Browser
Imports DotNetBrowser.Engine
Imports DotNetBrowser.Geometry
Imports DotNetBrowser.Ui
Imports SkiaSharp
''' <summary>
''' This example demonstrates how to get a screenshot of the web page
''' and save it as a PNG image using SkiaSharp.
''' </summary>
Friend Class Program
Public Shared Sub Main()
Dim viewWidth As UInteger = 1024
Dim viewHeight As UInteger = 20000
Dim browserSize As New Size(viewWidth, viewHeight)
Dim builder = New EngineOptions.Builder With {
.RenderingMode = RenderingMode.OffScreen
}
builder.ChromiumSwitches.Add("--disable-gpu")
builder.ChromiumSwitches.Add("--max-texture-size=" & viewHeight)
Using engine As IEngine = EngineFactory.Create(builder.Build())
Using browser As IBrowser = engine.CreateBrowser()
' #docfragment "HtmlToImage.SkiaSharp"
' 1. Resize browser to the required dimension.
browser.Size = browserSize
' 2. Load the required web page and wait until it is loaded completely.
Console.WriteLine("Loading https://html5test.teamdev.com")
browser.Navigation.LoadUrl("https://html5test.teamdev.com").Wait()
' 3. Take the bitmap of the currently loaded web page. Its size will be
' equal to the current browser's size.
Dim image As Bitmap = browser.TakeImage()
Console.WriteLine("Browser image taken")
' 4. Convert the bitmap to the required format and save it.
Dim skBitmap As SKBitmap = ToSKBitmap(image)
Using stream = File.OpenWrite(Path.GetFullPath("screenshot.png"))
Dim d As SKData = SKImage.FromBitmap(skBitmap).Encode(SKEncodedImageFormat.Png, 100)
d.SaveTo(stream)
End Using
Console.WriteLine("Browser image saved")
' #enddocfragment "HtmlToImage.SkiaSharp"
End Using
End Using
End Sub
' #docfragment "HtmlToImage.SKBitmap.Conversion"
Public Shared Function ToSKBitmap(browserBitmap As DotNetBrowser.Ui.Bitmap) As SKBitmap
Dim width = CInt(browserBitmap.Size.Width)
Dim height = CInt(browserBitmap.Size.Height)
Dim data() As Byte = browserBitmap.Pixels.ToArray()
Dim bitmap As SKBitmap = New SKBitmap()
Dim gcHandle As GCHandle =
GCHandle.Alloc(data, GCHandleType.Pinned)
Dim info As SKImageInfo = New SKImageInfo(width, height, SKColorType.Bgra8888, SKAlphaType.Premul)
Dim ptr As IntPtr = gcHandle.AddrOfPinnedObject()
Dim rowBytes = info.RowBytes
bitmap.InstallPixels(info, ptr, rowBytes, Sub() gcHandle.Free())
Return bitmap
End Function
' #enddocfragment "HtmlToImage.SKBitmap.Conversion"
End Class