调整对黑莓位图，同时保持Alpha数据 [英] Resize Bitmap on Blackberry, while keeping alpha data

问题描述

我有一个源图像中PNG与阿尔法信息，即我与规模Graphics.scaleInto（）：

I have a source image in PNG with alpha information, that I scale with Graphics.scaleInto():

Bitmap dst = new Bitmap(123, 178);
dst.createAlpha(Bitmap.ALPHA_BITDEPTH_8BPP);
Bitmap img = Bitmap.getBitmapResource(name);
img.scaleInto(dst, Bitmap.FILTER_BOX);

这工作的，新的缩放后的图像放在 DST ，但alpha信息失真。一些地区显示为白色，而有些是透明的。透明边框有一个蓝色的色调给他们。

This works, the new scaled image is put in dst, but the alpha information is distorted. Some areas show as white, while some are transparent. Transparency borders have a blue tint to them.

推荐答案

你如何绘制缩放后的图像？正如我发现<一个href=\"http://stackoverflow.com/questions/4239553/scale-a-bitmap-and-$p$pserve-alpha-on-blackberry/4299740\">my较早前的问题，即使相对于阿尔法做正确的比例，你需要调用一个绘图方法，它利用了阿尔法 - ）Graphics.drawARGB（

How do you draw the scaled image? As I found in my earlier question, even if you are doing the scaling correctly with respect to alpha, you need to call a drawing method that makes use of the alpha - Graphics.drawARGB().

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