绘图缩放位图上的SurfaceView - 无抗锯齿 [英] Drawing scaled bitmaps on a SurfaceView -- no antialiasing
问题描述
我很抱歉，如果这个话题已经被提交，但是网络和谷歌团体我所有的搜索并没有帮助我。
I'm sorry if this topic has been brought before, but all my searches on the web and google groups did not help me.
我目前正在开发的Android SDK中的一个小游戏，并使用我相应调整，以匹配设备的分辨率（让系统做到这一点对我来说是高分辨率的位图 不是脆就够了）。
I'm currently developing a little game with the Android SDK, and use hi-res bitmaps that I resize accordingly to match the device's resolution (letting the system do it for me is not "crisp" enough).
我使用SurfaceView，其上我画在一次通过画布填充整个表面上。该涂料采用setXfermode（新PorterDuffXfermode（PorterDuff.Mode.SRC_IN）），以便屏蔽。 在此之前，我找回各种各样的位图 - 这是调整大小在初始化与createScaledBitmap（），并放入高速缓存 - 我使用位图用涂料这个画布上，在SurfaceView绘制这个画布前。
I use a SurfaceView, on which I paint in one pass a canvas filling the whole surface. The paint uses setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)) to allow masking. Beforehand, I retrieve various bitmaps -- which are resized at initialization with createScaledBitmap() and put in a cache -- and I apply the bitmaps with a paint on this canvas, before drawing this canvas on the SurfaceView.
我的问题是，无论我试试，不管漆设置我使用（抖动，反锯齿等），调整大小后的位图不抗锯齿和绘图present锯齿状边缘。我什么都试过。 唯一的小成功，我是用inSampleSize接近所需的缩放大小和强制抗锯齿的第一遍，在检索调用createScaledBitmap前 高分辨率的位图，但它不是不够漂亮。我只是不能让创建pre大小的位图众人分辨率的每个组合。我错过了什么？
My problem is, whatever I try, whatever paint settings I use (dithering, antialias, etc..), the resized bitmaps are not antialiased and the drawing present jagged edges. I tried everything. The only little success I had was using inSampleSize to approach the desired scaled size and force a first pass of antialiasing, before invoking createScaledBitmap on the retrieved hi-res bitmap, but it is not beautiful enough. I just can't allow to create multitudes of pre-sized bitmaps for every combination of resolution. What did I miss ?
感谢很多提前
推荐答案
首先，当你加载的位图，你要确保你不设置选项丢失任何的图像质量argb_8888：
First when you load your bitmap you make sure that you don't lose any image quality by settings options to argb_8888:
Options options = new Options();
options.inScaled = false;
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap pic = BitmapFactory.decodeResource(getResources(), R.id.pic, options);
当您缩放过滤器上的位图依次为：
When you scale the bitmap turn on the filter:
pic = Bitmap.createScaledBitmap(pic, screenW, screenH, true);
但是，如果一个streaches图像过多不可避免地会降低质量。
However if one streaches the image too much inevitably it degrades in quality.
当您使用底漆可以提高质量，而且通过打开ditherig和过滤丧失速度：
When you use paint you can improve quality but lose on speed with turning on ditherig and filtering:
Paint paint = new Paint();
paint.setFlags(Paint.DITHER_FLAG);
paint.setFilterBitmap(true);
最后，整个活动窗口，可以在argb_4444而不是在argb_8888（; 2.3 OS＆LT）设置。如果你instert这条线，你可以恰克此之前的setContentView：
Finally the entire activity window could be set on argb_4444 instead on argb_8888 (OS < 2.3). You can chage this if you instert this line before setContentView:
getWindow().setFormat(PixelFormat.RGBA_8888);
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