bitmap | 易学教程

VB.NET Animated Gif to Bitmap, while retaining Anim

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问题 I am coding using Visual Basic. I have a little problem however. For my program, I need to layer GIFs/PNGs. I have accomplished this by using .DrawImage() It works fine however, the GIFs are inanimate and static. I have tried using the ImageAnimator Class, however, I am a bit in the dark. I tried using the sample code from MSDN, and it is not working for me. This is probably because I don't quite understand it. Private animatedImage As New Bitmap(My.Resources._a_takingnotes) Private

Unable to get the bitmap of a linearlayout along with its child views

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问题 I am creating the bitmap from a linearlayout with the following code public static Bitmap loadBitmapFromView(View v ) { //Bitmap b = Bitmap.createBitmap( v.getLayoutParams.width, v.getLayoutParams.height, Bitmap.Config.ARGB_8888); Bitmap b = Bitmap.createBitmap( v.getLayoutParams.width, v.getLayoutParams.height, Bitmap.Config.ARGB_8888); Canvas c = new Canvas(b); v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight()); v.draw(c); return b; } but i can not see the views in it all i can see

optimizing bitmap loading by using aSyncTask

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问题 I have been trying to optimize my single thread app which loads a bunch of tiles that makeup a large bitmap. The app was becoming very sluggish when it would load the new tiles into system memory. Im now looking trying to use Async Tasks for this purpose. The app detects which tile is in the top left in a method called by onDraw, creates a string that contains the path of the bitmap in the Assets folder, and then checks to see if the bitmap is null before drawing. If it is null, it will load

The most efficient way to show the local image in android

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问题 I am currently work on a magazine like apps. Since there is an option to zoom in(150%, 200%, 250% of original source) , I would prefer not to scale down the image. However , the app will force restart when I try to decode the image because of the out of memory. Are there any suggestion to fix that? The image are local (SD card) , can be retrieve in any approach, but eventually need to be a bitmap as I use something like cavans.drawbitmap to display it. I tried, input stream-> bytes , input

The most efficient way to show the local image in android

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How to use lots of bitmaps in a game without exceeding VM memory budget?

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问题 In my game i have 12 different animations and each animation consist of 10 bitmaps and each bitmap is 200x150 pixel. Every time user touches to the screen(virtual gamepad) one of the animations will play. Normally this is an easy job but performance wise i am having trouble. Loading all bitmaps on an array from the beginning of the game cause to crash game because of VM memory budget problem. It seems my other option is to recreate bitmaps everytime i need and then recyle them, but this might

Resolution is broken when converting byte to image?

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问题 This is what happens when I load my project file into my software. This happens when I convert the 'byte' parameter into image again. Here's my conversion method: public Bitmap ConverToImage(byte[] ImageByteArray) { using (MemoryStream stream = new MemoryStream(ImageByteArray)) { return (Bitmap)Image.FromStream(stream); } } Pushing the byte into an object of the ImageClass var image = new LayerClass { rect = l.rect, image = img.ConverToImage(l.imageByte), type = (LayerClass.Type)System.Enum

problems with big drawable jpg image

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问题 during a couple of days i've been looking here and on the Internet in many post for a solution on an issue im having loading or moving a large jpg image (located as a drawable reource by now) and I think it's time to ask myself altought there are many questions and solutions very related. I'm developing a 3D terrain simulation with OpenGL and the problem is that I'm using as terrain texture a quite large jpg image ( 2048x2048 = 1,94 MB ). Let's look at some workarround I Did: 1st: Bitmap

Postgresql GIN索引

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GIN概念介绍： GIN是Generalized Inverted Index的缩写。就是所谓的倒排索引。它处理的数据类型的值不是原子的，而是由元素构成。我们称之为复合类型。如(‘hank’, ‘15:3 21:4’)中，表示hank在15:3和21:4这两个位置出现过,下面会从具体的例子更加清晰的认识GIN索引。全文搜索 GIN的主要应用领域是加速全文搜索，所以，这里我们使用全文搜索的例子介绍一下GIN索引。如下，建一张表,doc_tsv是文本搜索类型，可以自动排序并消除重复的元素： postgres=# create table ts(doc text, doc_tsv tsvector); postgres=# insert into ts(doc) values ('Can a sheet slitter slit sheets?'), ('How many sheets could a sheet slitter slit?'), ('I slit a sheet, a sheet I slit.'), ('Upon a slitted sheet I sit.'), ('Whoever slit the sheets is a good sheet slitter.'), ('I am a sheet slitter.'), ('I slit sheets.'),

Convert a windows BITMAP to a PIX (unsigned char buffer)

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问题 I'm taking a screenshot of a window in order to proccess it with Leptonica and later do some OCR with Tesseract The problem is, performance wise I would like to avoid writing and reading the BMP to the disc and just work in memory instead. This is how I make the screenshot: int width, height = 0; HDC hdcWindow; HDC hdcMemDC = NULL; HBITMAP hbmScreen = NULL; BITMAP bmpScreen; // Retrieve the handle to a display device context for the client // area of the window. //hdcScreen = GetDC(NULL); /