Add support for GDX Texture Packer.

[Yayo-Arellano]

Problem to solve

Currently, if we want to use a sprite sheet in Flame we have two options:

• Fire Atlas: Very limited and hard to use
• Flame TexturePacker: It allows us to use code & web texture packer to create sprite sheets and load into Flame. But the implementation is minimal; it only supports the most basic packing options and no optimizations.

GDX Texture Packer is free software and supports many different optimizations like rotating sprites to make the sprite sheet smaller, removing unused pixels, splitting the sprite sheet into multiple images, etc.

Proposal

I forked Flame TexturePacker and modified it to support GDX Texture Packer. So far can:

• Support images packed on multiple pages
• Support rotates sprites
• Support indexes.

Other features that we can also support are: removing white pixels, filters, image format, etc.

More information

Here is the commit that adds support to Gdx texture packer.

[spydon]

Looks like a big step forward for that package, have you spoken to @Brixto about this?

However, I don't think a new component should be created but that the current SpriteAnimationComponent should be used, and just passing in the data read out from the atlas, is there anything stopping that?

[Yayo-Arellano]

@spydon, thanks for the answer. I haven't spoken with @Brixto about it. But now that he is in the loop, it would be nice to get some feedback. If we support GDX Texture Packer we can "kill two birds with one stone" because Code & Web Texture Packer also supports exporting sprite sheets with the extension .atlas.

However, I don't think a new component should be created but that the current SpriteAnimationComponent should be used, and just passing in the data read out from the atlas, is there anything stopping that?

Initially, I tried to use only SpriteAnimationComponent, but the problem is that some sprites from the animation will be rotated 90 degrees in the sprite sheet, and some will not. To un-rotate the particular frames, the width, and height must be swapped.

I've been trying to replicate the code from Libgdx so I think if I can do the rotation & resize in the Sprite then I do not need to create the classes AtlasSpriteComponent & AtlasSpriteAnimationComponent. I will take a look this weekend.

[Yayo-Arellano]

@spydon It was a simple change. Now the rotation is done in AtlasSprite so we can use SpriteAnimationComponent and SpriteComponents. I deleted the other components.

[Brixto]

Would love to see support of GDX Texture Packer in the flame_texturepacker plugin. Feel free to open a Pull Request 👍

[Yayo-Arellano]

Great. I created a pull request please let me know if there are comments