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NPAPI:AsyncDrawing: Difference between revisions
→NPDrawingModelAsyncWindowsSharedSurface
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The <code>data</code> pointer of the <code>NPAsyncSurface</code> will be a HANDLE that can be used, for example, through [http://msdn.microsoft.com/en-us/library/bb173598%28v=VS.85%29.aspx OpenSharedResource] in order to create a texture for the user. In order to allow fast drawing to any hardware surfaces the host will acquire the handle from [http://msdn.microsoft.com/en-us/library/bb174562%28v=VS.85%29.aspx IDXGISurface::GetSharedHandle]. This shared handle will represent a texture which is usable as a render target and is valid as a shader resource. The plugin can open this shared handle as a texture and then use it as a render target for any drawing operations. | The <code>data</code> pointer of the <code>NPAsyncSurface</code> will be a HANDLE that can be used, for example, through [http://msdn.microsoft.com/en-us/library/bb173598%28v=VS.85%29.aspx OpenSharedResource] in order to create a texture for the user. In order to allow fast drawing to any hardware surfaces the host will acquire the handle from [http://msdn.microsoft.com/en-us/library/bb174562%28v=VS.85%29.aspx IDXGISurface::GetSharedHandle]. This shared handle will represent a texture which is usable as a render target and is valid as a shader resource. The plugin can open this shared handle as a texture and then use it as a render target for any drawing operations. | ||
When a surface is set as current the plugin is responsible for making sure all drawing calls on that surface have completed execution! | |||
This sample code illustrates usage of this drawing model: | This sample code illustrates usage of this drawing model: | ||
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while (painting) { | while (painting) { | ||
// Draw to backBuffer texture | // Draw to backBuffer texture | ||
NPN_SetCurrentAsyncSurface(instance, npBackBuffer; | NPN_SetCurrentAsyncSurface(instance, npBackBuffer); | ||
ID3D10Texture2D *tmp = frontBuffer; | ID3D10Texture2D *tmp = frontBuffer; | ||
NPAsyncSurface *npTmp = npFrontBuffer; | NPAsyncSurface *npTmp = npFrontBuffer; | ||
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backBuffer = tmp; | backBuffer = tmp; | ||
npBackBuffer = npTmp; | npBackBuffer = npTmp; | ||
pDevice10->Flush(); | |||
} | } | ||