pixmap

问题 I have a huge amount of 2d images in my game, with multiple layers. I use spritebatch() and orthographicCamera() . I have some basic questions about performances : Does using Atlas is the faster way to load images ? What is faster to work with, Pixmap (and convert to texture before draw) or Textures? When i make a multiple layer image, should I use Texture.draw (or Pixmap.draw for Pixmap), make a final image and then render it ? Or should i render everything in the spritebatch.begin() and

问题 I am stuck with the following while creating OFF-SCREEN surface using OpenGL ES 2.0 : 1. How to create Off-Screen surface using eglCreatePixmapSurface()? 2. eglCreatePixmapSurface() API takes EGLNativePixmaptype as parameter, what is EGLNativePixmaptype ? how to find its Structure definiton? Can i make it on my own? ( In my Code base its declare as void * ) 3.Once the drawing is done on a Native Pixmap surface, how to access my Native Pixmap data? I have searched in internet alot but could

问题 I am stuck with the following while creating OFF-SCREEN surface using OpenGL ES 2.0 : 1. How to create Off-Screen surface using eglCreatePixmapSurface()? 2. eglCreatePixmapSurface() API takes EGLNativePixmaptype as parameter, what is EGLNativePixmaptype ? how to find its Structure definiton? Can i make it on my own? ( In my Code base its declare as void * ) 3.Once the drawing is done on a Native Pixmap surface, how to access my Native Pixmap data? I have searched in internet alot but could

问题 How can I draw an image to Pixmap, but rotated by some angle, like I can do when drawing on Batch? There is no Pixmap method that has an angle as parameter, like batch drawing methods have. 回答1: Ok, here is the code I managed to make (actually to borrow and adjust from here: Rotate Bitmap pixels ): public Pixmap rotatePixmap (Pixmap src, float angle){ final int width = src.getWidth(); final int height = src.getHeight(); Pixmap rotated = new Pixmap(width, height, src.getFormat()); final double

问题 Hey so I have this function which works and scales the image nicely and will shrink and expand it given the correct shortcuts from the UI. However I am losing picture quality when I zoom back to the original scaled factor of the image. I have tried making 'orig' which is a global 'const QPixmap*'. 'orig' is defined when the image is loaded into the UI. I then set 'pixmap = orig' (seen below in the code) but this doesn't seem to work, and I'm not sure why. The idea is to make a copy of it

问题 I need to rotate a Pixmap by 90 degrees. I have seen an answer that achieves a flipped Pixmap. I need to rotate images that are in portrait orientation to landscape already on the Pixmap-level to later create textures out of them. 回答1: similar to the flip pixmap method I achieved a 90º rotated Pixmap like this: private Pixmap rotatePixmap (Pixmap srcPix){ final int width = srcPix.getWidth(); final int height = srcPix.getHeight(); Pixmap rotatedPix = new Pixmap(height, width, srcPix.getFormat(

问题 I am trying to exploit mupdf library (Qt4 app). I have taken some code from pdfdraw.c. I was able to create a pixmap (fz_pixmap) from a pdf page. Now I need to display the pixmap. It is likely I can use QPixmap but I ask how to do so. 来源： https://stackoverflow.com/questions/7417994/mupdf-how-to-put-a-fz-pixmap-into-qt4-qpixmap

问题 How can i draw a circle with a smooth border on a pixmap? The normal "sample" parameter in the config doesn't affect a pixmap. EDIT: Pixmap ds = new Pixmap(width,height, Pixmap.Format.RGBA8888); ds.setColor(color); ds.fillCircle(ds.getWidth()/2, ds.getWidth()/2, (ds.getWidth()-20)/2); texture = new Texture(ds); ds.dispose(); The circle has a 200px radius. A normal circle-shape created with the shaperenderer produces a perfectly smooth circle... 回答1: The problem you have with the pixmap circle

问题 Suppose I have drawn simple text (say just the letter 'x') with some font parameters (like size 20 font, etc.) onto an (x,y) location in a QLabel that holds a QPixmap. What are the relevant methods that I will need to override in order to detect a mouse event when a click occurs "precisely" over one of these drawn x's. My first instinct is to lookup the stored (x,y) locations of drawn points and if the mouse current position is inside a tiny box around that (x,y) position, then I will execute

问题 How do I create Pixmap from TextureRegion or from Sprite? I need this in order to change color of some pixels and then create new Texture from Pixmap (during loading screen). 回答1: Texture texture = textureRegion.getTexture(); if (!texture.getTextureData().isPrepared()) { texture.getTextureData().prepare(); } Pixmap pixmap = texture.getTextureData().consumePixmap(); If you want only a part of that texture (the region), then you'll have to do some manual processing: for (int x = 0; x <