/// <summary>
/// 从指向非托管内存空间的WebPData指针解码
/// </summary>
/// <param name="webPDataPointer"></param>
/// <returns></returns>
public WebPAnimation DecodeFromWebPDataPointer(IntPtr webPDataPointer)
{
//解调WebP数据以提取所有帧、ICC配置文件和EXIF / XMP元数据
IntPtr demux = LibwebpdemuxUtils.WebPDemuxInternal(webPDataPointer, 0, IntPtr.Zero, Version);
//创建迭代器，用来遍历动画的每一帧
WebPIterator iter = new WebPIterator();
//创建指向迭代器的指针
IntPtr ptrIter = Marshal.AllocHGlobal(Marshal.SizeOf(iter));
//给迭代器指针赋初值
Marshal.StructureToPtr(iter, ptrIter, true);
//初始化WebP动画结构体，这是本函数要返回的结果
WebPAnimation animation = new WebPAnimation();
//遍历所有帧
if (LibwebpdemuxUtils.WebPDemuxGetFrame(demux, 1, ptrIter) != 0)
{
//如果成功获取了第一帧，就创建一个简单解码器
SimpleDecoder simpleDecoder = new SimpleDecoder();
do
{
//解引用迭代器指针，恢复出迭代器对象
iter = Marshal.PtrToStructure <WebPIterator>(ptrIter);
//创建一个动画帧对象
WebPAnimationFrame frame = new WebPAnimationFrame();
//将迭代器中获得的数据存入动画帧对象中
frame.Complete = Convert.ToBoolean(iter.complete);
frame.Duration = iter.duration;
frame.HasAlpha = Convert.ToBoolean(iter.has_alpha);
frame.Height = iter.height;
frame.Width = iter.width;
frame.XOffset = iter.x_offset;
frame.YOffset = iter.y_offset;
frame.Image = simpleDecoder.DecodeFromPointer(iter.fragment.bytes, (long)iter.fragment.size);
//将动画帧添加到动画对象中
animation.Frames.Add(frame);
} while (LibwebpdemuxUtils.WebPDemuxNextFrame(ptrIter) != 0);
//释放迭代器
LibwebpdemuxUtils.WebPDemuxReleaseIterator(ptrIter);
}
//释放之前申请的非托管内存空间
Marshal.FreeHGlobal(ptrIter);
//指针置为0
ptrIter = IntPtr.Zero;
//返回动画对象
return(animation);
}
private unsafe List <(Texture2D, int)> LoadAnimation2(string loadPath)
{
List <ValueTuple <Texture2D, int> > ret = new List <ValueTuple <Texture2D, int> >();
TextAsset textasset = Resources.Load <TextAsset>(loadPath);
byte[] bytes = textasset.bytes;
WebPDecoderConfig config = new WebPDecoderConfig();
if (NativeLibwebp.WebPInitDecoderConfig(&config) == 0)
{
throw new Exception("WebPInitDecoderConfig failed. Wrong version?");
}
WebPIterator iter = new WebPIterator();
fixed(byte *p = bytes)
{
WebPData webpdata = new WebPData
{
bytes = p,
size = new UIntPtr((uint)bytes.Length)
};
WebPDemuxer *webPDemuxer = NativeLibwebpdemux.WebPDemuxInternal(&webpdata, 0, (WebPDemuxState *)IntPtr.Zero, NativeLibwebpdemux.WEBP_DEMUX_ABI_VERSION);
VP8StatusCode result = NativeLibwebp.WebPGetFeatures(webpdata.bytes, webpdata.size, &config.input);
if (result != VP8StatusCode.VP8_STATUS_OK)
{
throw new Exception(string.Format("Failed WebPGetFeatures with error {0}.", result.ToString()));
}
int height = config.input.height;
int width = config.input.height;
config.options.bypass_filtering = 0;
config.options.use_threads = 1;
config.options.no_fancy_upsampling = 0;
config.options.use_cropping = 0;
config.options.use_scaling = 1;
config.options.scaled_width = width;
config.options.scaled_height = height;
config.options.flip = 1;
config.options.dithering_strength = 0;
config.output.colorspace = WEBP_CSP_MODE.MODE_RGBA;
config.output.width = width;
config.output.height = height;
//byte[] bbb = new byte[width * height];
//fixed (byte* ppp = bbb)
//{
// config.output.u.RGBA.rgba = (IntPtr)ppp;
//}
//config.output.u.RGBA.stride = width * 4;
//config.output.u.RGBA.size = (UIntPtr)(width * height);
//config.output.is_external_memory = 1;
//config.output.is_external_memory = 1;
int success = NativeLibwebpdemux.WebPDemuxGetFrame(webPDemuxer, 1, &iter);
if (success != 1)
{
return(ret);
}
int timestamp = 0;
int size = width * height * 4;
do
{
WebPData frame = iter.fragment;
VP8StatusCode status = NativeLibwebp.WebPDecode(frame.bytes, frame.size, &config);
if (status != VP8StatusCode.VP8_STATUS_OK)
{
Debug.LogError(status);
break;
}
Texture2D texture = Texture2DExt.CreateWebpTexture2D(width, height, isUseMipmap: false, isLinear: false);
texture.LoadRawTextureData((IntPtr)config.output.u.RGBA.rgba, size);
texture.Apply(updateMipmaps: false, makeNoLongerReadable: true);
timestamp += iter.duration;
ret.Add((texture, timestamp));
}while (NativeLibwebpdemux.WebPDemuxNextFrame(&iter) == 1);
NativeLibwebpdemux.WebPDemuxDelete(webPDemuxer);
NativeLibwebpdemux.WebPDemuxReleaseIterator(&iter);
}
return(ret);
}
public static extern void WebPDemuxReleaseIterator(ref WebPIterator dec);
private unsafe List <(Texture2D, int)> LoadAnimation2(string loadPath)
{
List <ValueTuple <Texture2D, int> > ret = new List <ValueTuple <Texture2D, int> >();
TextAsset textasset = Resources.Load <TextAsset>(loadPath);
byte[] bytes = textasset.bytes;
var config = new WebPDecoderConfig();
if (Decode.WebPInitDecoderConfig(ref config) == 0)
{
throw new Exception("WebPInitDecoderConfig failed. Wrong version?");
}
var iter = new WebPIterator();
IntPtr webpDataPtr = Marshal.AllocHGlobal(sizeof(WebPData));
IntPtr configPtr = Marshal.AllocHGlobal(Marshal.SizeOf(config));
IntPtr iterPtr = Marshal.AllocHGlobal(Marshal.SizeOf(iter));
try
{
fixed(byte *p = bytes)
{
IntPtr ptr = (IntPtr)p;
WebPData webpdata = new WebPData
{
bytes = ptr,
size = new UIntPtr((uint)bytes.Length)
};
Marshal.StructureToPtr(webpdata, webpDataPtr, false);
Marshal.StructureToPtr(config, configPtr, false);
Marshal.StructureToPtr(iter, iterPtr, false);
IntPtr webPDemuxer = Demux.WebPDemuxInternal(webpDataPtr, 0, (IntPtr)0, Demux.WEBP_DEMUX_ABI_VERSION);
VP8StatusCode result = Decode.WebPGetFeatures(webpdata.bytes, webpdata.size, ref config.input);
if (result != VP8StatusCode.VP8_STATUS_OK)
{
throw new Exception(string.Format("Failed WebPGetFeatures with error {0}.", result.ToString()));
}
var height = config.input.height;
var width = config.input.height;
config.options.bypass_filtering = 0;
config.options.use_threads = 1;
config.options.no_fancy_upsampling = 0;
config.options.use_cropping = 0;
config.options.use_scaling = 1;
config.options.scaled_width = width;
config.options.scaled_height = height;
config.options.flip = 1;
config.options.dithering_strength = 0;
config.output.colorspace = WEBP_CSP_MODE.MODE_RGBA;
config.output.width = width;
config.output.height = height;
//byte[] bbb = new byte[width * height];
//fixed (byte* ppp = bbb)
//{
// config.output.u.RGBA.rgba = (IntPtr)ppp;
//}
//config.output.u.RGBA.stride = width * 4;
//config.output.u.RGBA.size = (UIntPtr)(width * height);
//config.output.is_external_memory = 1;
//config.output.is_external_memory = 1;
int success = Demux.WebPDemuxGetFrame(webPDemuxer, 1, ref iter);
if (success != 1)
{
return(ret);
}
int timestamp = 0;
int size = width * height * 4;
do
{
WebPData frame = iter.fragment;
VP8StatusCode status = Decode.WebPDecode(frame.bytes, frame.size, ref config);
if (status != VP8StatusCode.VP8_STATUS_OK)
{
Debug.LogError(status);
break;
}
var texture = new Texture2D(width, height, TextureFormat.RGBA32, mipChain: false, linear: false);
texture.LoadRawTextureData(config.output.u.RGBA.rgba, size);
texture.Apply(updateMipmaps: false, makeNoLongerReadable: true);
timestamp += iter.duration;
ret.Add((texture, timestamp));
}while (Demux.WebPDemuxNextFrame(ref iter) == 1);
Demux.WebPDemuxDelete(webPDemuxer);
Demux.WebPDemuxReleaseIterator(ref iter);
}
}
finally
{
Marshal.FreeHGlobal(webpDataPtr);
Marshal.FreeHGlobal(configPtr);
Marshal.FreeHGlobal(iterPtr);
}
return(ret);
}
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