bitmap

问题 I cannot explain this (screenshot from Eclipse debug): Pixel at (0,0) does not have the values it was set for! All other pixels are fine, they do have the same value they were assigned to. EDIT I did some more digging, and the code for setPixel is calling a native function: 1391 public void setPixel(int x, int y, int color) { 1392 checkRecycled("Can't call setPixel() on a recycled bitmap"); 1393 if (!isMutable()) { 1394 throw new IllegalStateException(); 1395 } 1396 checkPixelAccess(x, y);

问题 I cannot explain this (screenshot from Eclipse debug): Pixel at (0,0) does not have the values it was set for! All other pixels are fine, they do have the same value they were assigned to. EDIT I did some more digging, and the code for setPixel is calling a native function: 1391 public void setPixel(int x, int y, int color) { 1392 checkRecycled("Can't call setPixel() on a recycled bitmap"); 1393 if (!isMutable()) { 1394 throw new IllegalStateException(); 1395 } 1396 checkPixelAccess(x, y);

问题 I'm currently working with Bitmap and trying to make some operation on pixels. I wanted to use Color.argb() and Color.valueOf() but those doesn't work for API Level < 26. Is there any library or something similar that could work with any API Level > 21 ? Here is the part of the function I use : int width = myBitmap.getWidth(); int height = myBitmap.getHeight(); Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); int [] allpixels = new int [ bmp.getHeight()*bmp.getWidth()

问题 A: Bitmap immutableBmp= BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.sample); mutableBitmap=immutableBmp.copy(Bitmap.Config.ARGB_8888, true); B: Bitmap immutableBmp= BitmapFactory.decodeFile(filePath); mutableBitmap=immutableBmp.copy(Bitmap.Config.ARGB_8888, true); C: BitmapFactory.Options options = new BitmapFactory.Options(); options.inMutable=true; myBitmap=BitmapFactory.decodeFile(filePath,options); A works but B and C don't. I am trying to convert an

问题 A: Bitmap immutableBmp= BitmapFactory.decodeResource(getApplicationContext().getResources(),R.drawable.sample); mutableBitmap=immutableBmp.copy(Bitmap.Config.ARGB_8888, true); B: Bitmap immutableBmp= BitmapFactory.decodeFile(filePath); mutableBitmap=immutableBmp.copy(Bitmap.Config.ARGB_8888, true); C: BitmapFactory.Options options = new BitmapFactory.Options(); options.inMutable=true; myBitmap=BitmapFactory.decodeFile(filePath,options); A works but B and C don't. I am trying to convert an

问题 I get the pixel data of my ARGB_8888 bitmap by doing this: public void getImagePixels(byte[] pixels, Bitmap image) { // calculate how many bytes our image consists of int bytes = image.getByteCount(); ByteBuffer buffer = ByteBuffer.allocate(bytes); // Create a new buffer image.copyPixelsToBuffer(buffer); // Move the byte data to the buffer pixels = buffer.array(); // Get the underlying array containing the data. } But, I would like to convert this data, in which each pixel is stored on four

问题 Somehow I have Drawable image from Drawable folder like as Drawable thumb = mContext.getResources().getDrawable(R.drawable.image_name); i try like this String image_name =thumb.getCurrent().toString(); But my need image name that means image_name from thumb; How it is possible? Any suggestion, comment, consults; provide useful links are highly appreciate. Advance Thanks 回答1: You can try like this: int imageid = getResources().getIdentifier("image_name", "drawable", getPackageName()); String

问题 Somehow I have Drawable image from Drawable folder like as Drawable thumb = mContext.getResources().getDrawable(R.drawable.image_name); i try like this String image_name =thumb.getCurrent().toString(); But my need image name that means image_name from thumb; How it is possible? Any suggestion, comment, consults; provide useful links are highly appreciate. Advance Thanks 回答1: You can try like this: int imageid = getResources().getIdentifier("image_name", "drawable", getPackageName()); String

问题 I have a function which downloads an image, and saves the image data. Based on user preference, it can save the image data in one of two ways - as an ImageData Uint8ClampedArray, or as an ImageBitmap. I'm using an image loading function to wait until the image is loaded before running my save function: function loadImage(src) { return new Promise((resolve, reject) => { const img = new Image(); img.crossOrigin = '*'; img.addEventListener('load', () => resolve(img)); img.src = src; }); } The

问题 For learning purposes, I want to create a single 2x2 bitmap image using C programming language with no external libraries (such as SDL). I've read that I need to create a header for the bitmap file but failed to understand how to implement it in code and why does the bmp header have those parameters. I can't find any clear tutorial on how I could do it using C. Could you provide me some guidance on how to implement this by a simple documented example? I'm using Linux. 回答1: why does the bmp