bitmap

问题 At the moment, I am using the SetPixel() method to change the colour of every pixel in a bitmap. This works fine on small images with small dimensions, but when I test it on large images it does take a while. I haven't worked with images in VB.Net before, so I might just be overlooking something obvious. I'm doing this to make a program which converts an image to grey scale. This produces the right result but at a low speed, and during this time the UI freezes, so I'm keen to maximize the

问题 I have an RelativeLayout that contains a custom ImageView, the scaleType="centerInside", I load in a bitmap (usually smaller than the imageView). How can I get the top/left position of where the bitmap was drawn? I need to be able addView's on top a positions relative to the bitmap. RelativeLayout view = (RelativeLayout) inflater.inflate(R.layout.scroll_scaled, container, false); ContentImageView image = (ContentImageView) view.findViewById(R.id.base_page); Bitmap bm = mInterfaceActivity

问题 I'm just using a .NET port of Pdfium named PdfiumViewer. It just works very well once rendered in the WinForm controls but when I try to render it on a Bitmap to show in the WPF windows (or even saving to disk) the rendered text has problem. var pdfDoc = PdfiumViewer.PdfDocument.Load(FileName); int width = (int)(this.ActualWidth - 30) / 2; int height = (int)this.ActualHeight - 30; var bitmap = new System.Drawing.Bitmap(width, height); var g = System.Drawing.Graphics.FromImage(bitmap); g

问题 I'm receiving an UnauthorizedAccessException ("Invalid cross-thread access.") when running the following code on a background (threadpool) thread, is this expected behaviour? var uri = new Uri("resourcevault/images/defaultSearch.png", UriKind.Relative); var info = Application.GetResourceStream(uri); // this line throws exception.... this.defaultSearchImage = new BitmapImage(); 回答1: The reason is because your background thread cannot directly be used to update the UI. Instead, you need to use

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Bitmap byte-size after decoding? Is there anyway so I can get the size of this Bitmap?I've tried to use getByteCount() but I can't use it? Bitmap bitmap = BitmapFactory.decodeByteArray(decryptedData , 0, decryptedData .length); //decoding bytearrayoutputstream to bitmap Any suggestions? 回答1: As you can see from the API, you can use getWidth() getHeight() for the size of the Bitmap in pixels. And if it is an

问题 I have created an ImageView and I can see the preview of the Camera and load the captured image into the ImageView and I wanted to store the image into a directory in my internal memory. I have referred many posts and tried but I couldn't find my image in my internal memory. This is the code I have used: package com.example.shravan.camera; import android.content.Context; import android.content.ContextWrapper; import android.content.Intent; import android.content.pm.PackageManager; import

问题 I got a problem with an Air Native Extension in Android. The ANE receive a Bitmap from the Actionscript side, compress it in jpeg format and send it back to the Actionscript that will write it on the storage. Everything is good but one last thing. It seems that the channels order for Actionscript is different than in Android, so my compressed image have RED colors in place of BLUE.. here is the code: Actionscript (I'm using a library called deng.fzip.FZipLibrary to get the bitmap from a zip

问题 I've been working on a bit of a bitmap parser lately in pure C just to understand the low level workings of simpler image formats. So far, using Wikipedia's article on bitmap files, I've been able to (what I think at least) parse the information correctly - at least, most of it. The problem is that I'm not quite sure what to do from there: since I've been working with a 3.1 context, I have access to many more modernized features which is nice, albeit I'm still lost. I have a window setup with

问题 I am developing an android app where I have to rotate a circular image around another circular image, but when I am running this the size of my circular image gets automatically changing continuously. So please help me how to solve this. Here is my code public class JobSearch extends Activity implements OnTouchListener { private ImageView dialer; private float y=0; public boolean onTouch(View v, MotionEvent event) { double r=Math.atan2(event.getX()-dialer.getWidth()/2, dialer.getHeight()/2

问题 I am developing an android app where I have to rotate a circular image around another circular image, but when I am running this the size of my circular image gets automatically changing continuously. So please help me how to solve this. Here is my code public class JobSearch extends Activity implements OnTouchListener { private ImageView dialer; private float y=0; public boolean onTouch(View v, MotionEvent event) { double r=Math.atan2(event.getX()-dialer.getWidth()/2, dialer.getHeight()/2