[英]LIBGdx - I get gray pixels in a sprite when saving as PNG
I've been trying to scale down a sprite and save it to the android local store for later use, but everything I've tried always results in a grey edge around the sprite.我一直在尝试缩小精灵并将其保存到 android 本地商店以备后用,但我尝试过的一切总是导致精灵周围出现灰色边缘。
As you can see, the sprite batch blend function is set to GL20.GL_ONE
, GL20.GL_ONE_MINUS_SRC_ALPHA
and rendering to the screen look fine.如您所见,精灵批处理混合功能设置为
GL20.GL_ONE
、 GL20.GL_ONE_MINUS_SRC_ALPHA
并且渲染到屏幕看起来很好。 It's only when the PNG is written that I get the dark edge.只有在写入 PNG 时,我才会得到暗边。 I've tried setting Pixmap blending to none and using a premultiplied alpha version of the original image (that's why there are two images), but when I look in the emulator's file system I get the same result.
我已经尝试将 Pixmap 混合设置为无并使用原始图像的预乘 alpha 版本(这就是为什么有两个图像),但是当我查看模拟器的文件系统时,我得到了相同的结果。 Here's my code:
这是我的代码:
private AssetManager assetManager = new AssetManager();
private TextureLoader.TextureParameter textureParameter = new TextureLoader.TextureParameter();
private SpriteBatch spriteBatch;
private FrameBuffer frameBuffer;
@Override
public void create()
{
Matrix4 matrix4 = new Matrix4();
this.spriteBatch = new SpriteBatch();
this.spriteBatch.setProjectionMatrix(matrix4.setToOrtho2D(0, 0, 96, 48));
this.spriteBatch.setBlendFunction(GL20.GL_ONE, GL20.GL_ONE_MINUS_SRC_ALPHA);
this.frameBuffer = new FrameBuffer(Pixmap.Format.RGBA8888, 96, 48, false);
this.textureParameter.genMipMaps = true;
this.assetManager.load("sprite.png", Texture.class, textureParameter);
this.assetManager.load("sprite_pre_multiplied.png", Texture.class, textureParameter);
this.assetManager.finishLoading();
Texture texture = this.assetManager.get("sprite.png");
Texture texture_pre = this.assetManager.get("sprite_pre_multiplied.png");
texture.setFilter(Texture.TextureFilter.MipMapLinearNearest, Texture.TextureFilter.Linear);
texture_pre.setFilter(Texture.TextureFilter.MipMapLinearNearest, Texture.TextureFilter.Linear);
this.frameBuffer.begin();
this.spriteBatch.begin();
this.spriteBatch.draw(texture, 0, 0, 48, 48, 0, 0, 132, 132, false, false);
this.spriteBatch.draw(texture_pre, 48, 0, 48, 48, 0, 0, 132, 132, false, false);
this.spriteBatch.end();
Pixmap pixmap = ScreenUtils.getFrameBufferPixmap(0, 0, 96, 48);
pixmap.setBlending(Pixmap.Blending.None);
this.frameBuffer.end();
PixmapIO.writePNG(Gdx.files.local("sprites.png"), pixmap);
this.spriteBatch.setProjectionMatrix(matrix4.setToOrtho2D(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight()));
}
@Override
public void render()
{
Gdx.gl.glClearColor(1, 1, 1, 1);
Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
this.spriteBatch.begin();
this.spriteBatch.draw(this.frameBuffer.getColorBufferTexture(), (Gdx.graphics.getWidth() - 96)/2f, Gdx.graphics.getHeight()/2f, 96, 48, 0, 0, 96, 48, false, false);
this.spriteBatch.end();
}
There was several issues and we found the solution together on Discord, so to sum things up to others :有几个问题,我们一起在 Discord 上找到了解决方案,总结一下:
For the 3rd point, it has to be re-exported from Gimp like this :对于第三点,它必须像这样从 Gimp 重新导出:
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