bitmap | 易学教程

Copying bytes from Bitmap to byte array and back with Marshall.Copy doesn't work right

阅读更多关于 Copying bytes from Bitmap to byte array and back with Marshall.Copy doesn't work right

问题 I want to copy bytes with Marshall.Copy. My code work, but bytes is strange for me. I think, I got indexes not real bytes. If this compute and save back, I got different colors in image with lot bigger byte size (image size is same). Bitmap bmp = new Bitmap(imagepath); Width = bmp.Width; Height = bmp.Height; byte[] data; BitmapData bdata; switch (bmp.PixelFormat) { case PixelFormat.Format8bppIndexed: { data = new byte[Width * Height]; bdata = bmp.LockBits(new Rectangle(0, 0, Width, Height)

Convert Bitmap to ByteArray and vice versa

阅读更多关于 Convert Bitmap to ByteArray and vice versa

问题 In my android application i want to convert image ,taken from camera, to byte array and convert back to bitmap to view in a image view. I can do it easily through Bitmap.compress. But i want to do it without Bitmap.compress. The problem is that i am getting white lines (poor images every time(lines) ) Bitmap hello; //image coming from camera ByteBuffer buffer = ByteBuffer.allocate(hello.getByteCount()); hello.copyPixelsToBuffer(buffer); byte[] bytes1 = buffer.array(); byte [] Bits = new byte

Out of Memory Exception - Google Map GroundOverLay

阅读更多关于 Out of Memory Exception - Google Map GroundOverLay

问题 I'm trying to draw a picture on the google map. I'm using the latest version of google play services and checked a lot for this issue and couldn't find an answer. Here's some code: BitmapDescriptor image = BitmapDescriptorFactory.fromResource(R.drawable.drawing_bg); LatLngBounds drawingBounds = new LatLngBounds( new LatLng(29.93530, 30.88324), new LatLng(29.93609, 30.88329)) .including(new LatLng(29.93580, 30.88286)) .including(new LatLng(29.93563, 30.88374)) .including( new LatLng(29.93593,

Out of Memory Exception - Google Map GroundOverLay

阅读更多关于 Out of Memory Exception - Google Map GroundOverLay

CreateDIBitmap与CreateDIBSection的区别（转）

阅读更多关于 CreateDIBitmap与CreateDIBSection的区别（转）

https://www.cnblogs.com/staring-hxs/archive/2013/08/17/3264896.html 最主要区别： CreateDIBitmap 创建的是设备相关位图句柄 CreateDIBSection 创建的是设备无关位图句柄 CreateDIBSection 创建的是一个 DIBSECTION 结构， CreateDIBitmap 创建的是 BITMAP 结构。来源： https://www.cnblogs.com/merlinzjl/p/12154474.html

Bitmap和Drawable的关系、区别

阅读更多关于 Bitmap和Drawable的关系、区别

Bitmap - 称作位图，一般位图的文件格式后缀为bmp Drawable - 作为Android平下通用的图形对象，它可以装载常用格式的图像比如GIF、PNG、JPG，当然也支持BMP，当然还提供一些高级的可视化对象，比如渐变、图形等。 Bitmap是Drawable . Drawable不一定是Bitmap Drawable在内存占用和绘制速度这两个非常关键的点上胜过Bitmap 1、Bitmap对象 Resources res = getResources(); Bitmap bmp = BitmapFactory.decodeResource(res, R.drawable.icon); 获取其宽高的方法： bmp.getHeight() bmp.getWidth() 2、Drawable对象 Drawable drawable = getResources().getDrawable(R.drawable.icon); 获取其宽高的方法： drawable.getIntrinsicWidth(); drawable.getIntrinsicHeight(); 3、Bitmap转换成Drawable Bitmap bm=xxx; //xxx根据你的情况获取 BitmapDrawable bd= new BitmapDrawable(getResource(), bm);

Android. W/OpenGLRenderer: Bitmap too large to be uploaded into a texture

阅读更多关于 Android. W/OpenGLRenderer: Bitmap too large to be uploaded into a texture

问题 When I call Canvas.drawBitmap() for a Bitmap with more than 4096px on one side - I get nothing. No errors and no bitmap drawn. There appears only this message in LogCat: W/OpenGLRenderer: Bitmap too large to be uploaded into a texture (2880x4920, max=4096x4096) This leads to these questions: What does the limit of 4096x4096 depend on? The Android version? The Kernel drivers? Or the Hardware? How can I check this limit at runtime for the current device? How can I catch the error "W

C# - Converting Bitmap to byte[] using Marshal.Copy not working consistently?

阅读更多关于 C# - Converting Bitmap to byte[] using Marshal.Copy not working consistently?

问题 I have been trying to implement the image comparing algorithm seen here: http://www.dotnetexamples.com/2012/07/fast-bitmap-comparison-c.html The problem I have been having is that when I try to compare a large amount of images one after another using the method pasted below (a slightly modified version from the link above), my results seem to be inaccurate. In particular, if I try to compare too many different images, even the ones that are the same will occasionally be detected as different.

Android: SurfaceView Flickering

阅读更多关于 Android: SurfaceView Flickering

问题 I am having an issue with drawing to a SurfaceView , when the bitmap images on the SurfaceView are moved, they flicker (or tear). I did not have this problem in previous iterations of my code. But now that I finally got the bitmaps to scale properly by using a separate Canvas for each bitmap, this problem started occurring. These are the important parts of my custom SurfaceView class: public class DrawingSurface extends SurfaceView implements SurfaceHolder.Callback { public DrawingSurface

Assign the Intended bitmap value to an imageView

阅读更多关于 Assign the Intended bitmap value to an imageView

问题 I'm using an adapter to load the items to a grid. then when the user select an item from the grid then it opens up the customizing screen. In that process I'm sending some data in the intent and later I can load the these in the customizing screen. Successfully I have loaded the other items other than the isVeg item. Response I'mgetting for isVeg , [false, true, false, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true] . My problem is the way I