![]() ![]() However this can make the animation look jerky.ĭoing transparent rendering of GIFs without using photoshop's wand, which is just registering transparent entries in the GIF's pallete isn't difficult. This prevents the image from jumping on heavily loaded systems. In this case I found it helpful to add another event object so the thread can wait till it is told to draw before proceeding to the frame wait. Or, you could use a version like I have implimented that instead of rendering direct to the window, the thread simply invalidates the window for the rectangle with the image and then the paint operation for the window calls a draw function in the ImageEx to do the actual rendering. this assumes your window your rendering on is processing the WM_ERASEBKGND message. If your using code similar to this example this can be accomplished by using RedrawWindow() with RDW_ERASE flag. One thing I haven't included in this article is starting up and shutting the GDI+ For code reference just search for GDI+ within the code. Sample apps and code include the full listings for implementing animated GIF in If you familiar with the concepts and programming of GDI, GDI+ provides someĪdvance features and the interface almost mirrors the. Numeric constant to a string (see the example code). Project and give it a resource type of "GIF" and then rename the resource ID from a Image directly as a resource from an executable. One other interesting aspect of this class is it has the ability of loading a Long lPause = ((long*) m_pPropertyItem->value) * 10 ĭWORD dwErr = WaitForSingleObject(m_hExitEvent, lPause) SelectActiveFrame(&pageGuid, m_nFramePosition++) Graphics.DrawImage( this, m_rc.left, m_rc.top, hmWidth, hmHeight) ::WaitForSingleObject(m_hPause, INFINITE) Implementationįirstly lets look at drawing a simple image using GDI+. The Matrix Object, Scalable Regions, Alpha Blending and support for multipleĭuring my development of Windows GUI based applications with GDI+, I've comeĪcross the need to display animated GIFs, whilst GDI+ does not supportĭisplaying animated GIFs directly, in can be done with a little coding. Supports: Gradient Brushes, Independent Path Objects, Transformations and.Optimizes many of the capabilities of GDI.There numerous compelling reasons why you should be I've been using GDI+ in new applications and also converting existingĪpplications to use GDI+. Windows C++ programmer developing for desktop applications, I've been How many of you developers are using GDI+? I reckon, not many. ![]()
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