masking

问题 I'm masking a surface in pygame as suggested by nkorth in response to the question is there any way to only blit or update in a mask, updating the mask and masked surfaces each frame. And while it is possible to achieve this using his method, the frame rate drops immediately, and that's with just one instance of this surface being rendered on the screen at any one time. Here is the image I want to mask, and here is how it should look like on the application. These other circles are not

问题 Alright what I am trying to do is: given an image where there is a circle within that image that is "blank". I want to take an existing image from user library and then mask it so that only a certain part of that image is shown on the "blank" image.. I have tried a few masking code but they all seem to work the other way around ... any tips on how to tackle this? 回答1: Unfortunately you can't use CoreAnimation to do this (which would make it rather easy). Looking at Apple's CoreAnimation

问题 Duplicate so don't negative my reputation. My mask image is : My output is : - (UIImage*)maskImage:(UIImage *)image withMask:(UIImage *)maskImage { CGImageRef maskRef = maskImage.CGImage; CGImageRef mask = CGImageMaskCreate( CGImageGetWidth(maskRef), CGImageGetHeight(maskRef), CGImageGetBitsPerComponent(maskRef), CGImageGetBitsPerPixel(maskRef), CGImageGetBytesPerRow(maskRef), CGImageGetDataProvider(maskRef), NULL, false ); CGImageRef masked = CGImageCreateWithMask(image.CGImage, mask);

问题 I was following a guide provided by MDN on Writing a WebSocket server, the guide is pretty straightforward and easy to understand... However upon following this tutorial I ran across the frame that WebSocket messages from the client are sent in: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-------+-+-------------+-------------------------------+ |F|R|R|R| opcode|M| Payload len | Extended payload length | |I|S|S|S| (4) |A| (7) | (16/64) | |N|V|V|V| |S| | (if

问题 I built a website for a client at clientsite.com. She has a new business and wants a wordpress site. So I installed wordpress in clientsite.com/wordpress. I can't install wordpress in the root because that's where her original site is and I need the wordpress site in its own folder. She has a domain with godaddy called newbusiness.com. I assigned that to bluehost (her host provider) and added it as an addon and now when you go to newbusiness.com you see the pages located at clientsite.com

问题 I am trying to mask an image with OpenGL so that part of it is transparent. Here's my code, which isn't working: draw_img(background); ... glEnable(GL_BLEND); glDisable(GL_DEPTH_TEST); glBlendFunc(GL_ONE, GL_ZERO); draw_img(mask); glBlendFunc(GL_DST_ALPHA, GL_ONE_MINUS_DST_ALPHA); draw_img(foreground); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); Here is my background image, over which I am trying to draw: Here are the texture and the mask, respectively (The white in the mask is really

问题 I'd like to create an effect in a site I’m building where an image is masked by an overlay. The overlay should create a “fade out” effect — I don’t actually want anything animated, but the overlay should make the image look as if it’s fading to the background colour at the edges. Something like this: http://imgur.com/fqtc9.png I prefer to do this with CSS/HTML/JS - not images. Any thoughts on where to start? Thanks. 回答1: you could do something like this for example : Example html <div class=

问题 I am developing an App on xCode with Swift. My screen has an Image of an animal (outlet "backImage"), over this image I have a view (outlet "coverView"), color black, which covers all the screen. So so far you can't see the animal image, because the "coverView" is in front of it. Then I have another view (outlet "maskView") which is smaller and it's over the big view "coverView". What I want is to use this "maskView" as mask and therefor see the "backImage" through it, like a window. Is there

问题 I am trying to show a MapView as a circle on Android just like that: protected void onDraw(Canvas canvas) { Path path = new Path(); path.addCircle(400,200,100,Direction.CW); canvas.clipPath(path); super.onDraw(canvas); } Unfortunately the MapView (v2: com.google.android.gms.maps.MapView ) component seems to ignore that and instead just taking the bounds/rect of that circle to draw the map :( I've been searching the web for a while now, not finding a nice solution for that. Is this even

问题 I have it where a user can move an image and uilabel around the screen. Say it is a black image and black text. I want the portion of the text that overlaps with the image to become transparent so that the background shows through and you can still read the text even though they were originally the same color. Hopefully this makes sense. I've found some links on erasing with touch. I'm not sure how to go about automating this with the portion of the text that overlaps. Maybe something like