gdi+

问题 Any ideas why one of recent Windows updates causes issues with GraphicsPath.AddString() and some fonts but only for specific characters? How to fix that? Example font is Thin Pencil Handwriting (it's public domain, so you can try for yourself). It works fine if you use Graphics.DrawString() with it. It also works fine if you try to use GraphicsPath.AddString() with it to write Lorem ipsum , but will fail if you try to use C character (capital c ) or 5 digit. It worked perfectly fine just few

问题 I need to convert between Drawing.Font.Size (float, ?) and WPF FontSize (double, WPF pixels). Finally, I decided to store in the database the fontSize in inch... How can I convert the GDI FontSize to inch and the WPF FontSize to inch? sizeInInch = wpfFontSize / 96 sizeInInch = gdiFontSize / ? Can I use something DPI independent? Maybe System.Windows.FontSizeConverter ? I need to convert to something, that will allow me to switch multiple time between WPF and GDI without changing the "real

问题 GDI+ has not support to CF_DIBV5 format BUT when several applications put transparent images to clipboard they use CF_DIBV5 (Format 17) format to maintain Alpha Channel. .NET Framework can't handle CF_DIBV5 format so a .NET application can't put or retrieve alpha images to/from clipboard. Is there any c# code to support CF_DIBV5 to Bitmap transformation from Clipboard? 回答1: SORRY! I'm answering my own question: [StructLayout(LayoutKind.Sequential)] public struct BITMAPV5HEADER { public uint

问题 I have an icon with partial alpha (alpha values between 0 and 255) that I want to display using GDIPlus. When using the Bitmap constructor of GDI+ that takes the direct filename, the file displays properly. However, when loading from resource, it has a problem recognizing alpha. I looked on MSDN, and there are problems with alpha: http://msdn.microsoft.com/en-us/library/windows/desktop/ms536318.aspx. By retrieving the ICONINFO structure from the Icon, I can get rid of the fully transparent

问题 My problem is the following : I am making a program, which can manipulate brightness, gamma and contrast through C# code. For brightness and gamma it is OK. I have achieved it through code I found in the net, but I can't for contrast. The only thing I have found by now is a CalculateRamp method, which has as input parameters (double level, double brightness, double gamma, double contrast) . I know what input to give for brightness, gamma and contrast (the values from the sliders in the

问题 I've this piece of code working on Windows 7 64-bit: it allows me to transform a representation of an Image contained into a std::string ( Base64EncodedImage ) to a GdiPlus::Bitmap : HRESULT hr; using namespace Gdiplus; std::string decodedImage = Base64EncodedImage; DWORD imageSize = decodedImage.length(); HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, imageSize); if (!hMem) ErrorExit(TEXT("GlobalAlloc")); //http://msdn.microsoft.com/en-us/library/windows/desktop/ms682499(v=vs.85).aspx LPVOID

问题 I've created a simple solution with 2 projects. The 1st project (class library) contains a custom control called Container which draws itself with rounded corners. The 2nd project (windows forms) is a test application. If I add a Container instance to main Form in the 2nd project it shows the rounded corners nicely. Also when I run the 2nd project I can see the Container. However when I start moving the form (click and hold the title bar), especially when I move it very fast, all the drawing

问题 I am using IShellItemImageFactory to extract the icon for a file. I was able successfully extract it and show it in a dialog using SendDlgItemMessage(hDlg,IDC_STATIC2, STM_SETIMAGE, IMAGE_ICON, (LPARAM)hicon); see the output: click here The issue is when I am saving this as a file(PNG format) using GDI+ the gradients are not preserving correcting. Find the code below that I am using. GdiplusStartupInput gdiplusStartupInput; ULONG_PTR gdiplusToken; GdiplusStartup(&gdiplusToken,

问题 For an application I need to draw text/glyphs as a vector based path. Using GDI+ GraphicsPath and Graphics.DrawPath or WPF FormattedText and Geometry works fine and I get the output as shown in the first picture. But is it somehow possible to get letters as a single line path as shown in the second picture (shows an L). I'm glad if anyone has an idea. See this example. Using built-in function will always give you the path of a letter containing it's inner and outer borderline. Only the first

问题 I need a fast way to draw an overlay on a screen with transparency support. I've done a lot of searching and found one potential solution (which has its own problems) and another solution that does not fit my requirements; specifically transparency support. I'll start with the latter and then touch on the former. Solution 1 Using a borderless form with a TransparencyKey, this is one of the most recommended solutions I've found and the least helpful. This solution works by having a new Form,