public static SequenceFrame[] GetFrames(byte[] bytes)
{
var gifData = new GifData(bytes);
GetFramesVoid(gifData);
return(gifData.Frames);
}
IEnumerator DecodeAndPlay()
{
if (!GifAsset)
{
Debug.LogError("UnityGif@" + name + ": Gif asset is null, please check gif asset SerializeField !");
yield break;
}
var gifData = new GifData(GifAsset.bytes);
yield return(GifHelper.GetFramesEnumerator(gifData));
if (gifData.Frames == null)
{
Debug.Log("Gif decoding by Coroutine does not effect, use no-Coroutine instead !");
GifHelper.GetFramesVoid(gifData);
}
Frames = gifData.Frames;
StartCoroutine(PlayNextFrame());
}
public static void GetFramesVoid(GifData gifData)
{
//初始化GIF
var gif = new GraphicsInterchangeFormat(gifData.Bytes);
//借助组件单帧加载可以不考虑了，因为Gif需要借助上一帧
//序列帧集初始化
gifData.Frames = new SequenceFrame[gif.FrameImageDescriptors.Length];
//初始化Texture
var frameTexture = new Texture2D(gif.Width, gif.Height);
//透明背景
var transparentPixels = frameTexture.GetPixels32();
for (var index = 0; index < transparentPixels.Length; index++)
{
transparentPixels[index] = Color.clear;
}
//背景色
var backgroundColor = gif.GetPixel(gif.BgColorIndex);
var backgroundPixels = frameTexture.GetPixels32();
for (var index = 0; index < backgroundPixels.Length; index++)
{
backgroundPixels[index] = backgroundColor;
}
//记录下一帧的处理方法
bool previousReserved = false;
//处理每个图块
for (var frameIndex = 0; frameIndex < gifData.Frames.Length; frameIndex++)
{
//命名
frameTexture.name = "FrameOfIndex" + frameIndex;
//图像描述器
var frameImageDescriptor = gif.FrameImageDescriptors[frameIndex];
//绘图控制扩展
var frameGraphicController = gif.FrameGraphicControllers[frameIndex];
//着色范围
var blockWidth = frameImageDescriptor.Width;
var blockHeight = frameImageDescriptor.Height;
var leftIndex = frameImageDescriptor.MarginLeft; //含
var rightBorder = leftIndex + blockWidth; //不含
var topBorder = gif.Height - frameImageDescriptor.MarginTop; //不含
var bottomIndex = topBorder - blockHeight; //含
//色表
var descriptorPixels = frameImageDescriptor.GetPixels(frameGraphicController, gif);
//色表指针
var colorIndex = -1;
//gif的y是从上往下，texture的y是从下往上
for (var y = topBorder - 1; y >= bottomIndex; y--)
{
for (var x = leftIndex; x < rightBorder; x++)
{
colorIndex++;
//判断是否保留像素
if (previousReserved && descriptorPixels[colorIndex].a == 0)
{
continue;
}
frameTexture.SetPixel(x, y, descriptorPixels[colorIndex]);
}
}
//保存
frameTexture.wrapMode = TextureWrapMode.Clamp;
frameTexture.Apply();
//添加序列帧,并兵初始化Texture
gifData.Frames[frameIndex] = new SequenceFrame(frameTexture, frameGraphicController.DelaySeconds);
//预处理下一帧图像
previousReserved = false;
frameTexture = new Texture2D(gif.Width, gif.Height);
switch (frameGraphicController.NextFrameDisposalMethod)
{
case NextFrameDisposalMethod.Bg:
frameTexture.SetPixels32(backgroundPixels);
break;
case NextFrameDisposalMethod.Previous:
frameTexture.SetPixels32(gifData.Frames[frameIndex - 1].Texture.GetPixels32());
previousReserved = true;
break;
default:
frameTexture.SetPixels32(gifData.Frames[frameIndex].Texture.GetPixels32());
previousReserved = true;
break;
}
}
}