private string filename = "8.gif";
private List<WriteableBitmap> list = new List<WriteableBitmap>();
async void hf_FileCompeted(int code, object sender)
{
Windows.Storage.StorageFolder localFolder = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFolderAsync("image", Windows.Storage.CreationCollisionOption.OpenIfExists);
IStorageFile fileinto = await localFolder.GetFileAsync(filename);
IRandomAccessStream ias = await fileinto.OpenReadAsync();
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(BitmapDecoder.GifDecoderId, ias);
System.Diagnostics.Debug.WriteLine("总的帧数:" + decoder.FrameCount.ToString());
Print(decoder.PixelHeight + ":" + decoder.PixelWidth);
for (int k = 0; k < (int)decoder.FrameCount; k++)
{
// 获取第一帧
BitmapFrame frame = await decoder.GetFrameAsync((uint)k);
// 获取像素数据
PixelDataProvider pixprd = await frame.GetPixelDataAsync(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, new BitmapTransform(), ExifOrientationMode.RespectExifOrientation, ColorManagementMode.DoNotColorManage);
Print(frame.DpiX+":"+frame.DpiY+":"+frame.OrientedPixelHeight+":"+frame.OrientedPixelWidth+":"+frame.PixelHeight+":"+frame.PixelWidth);
var dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
// 创建新的位图对象
WriteableBitmap wb = new WriteableBitmap((int)frame.PixelWidth, (int)frame.PixelHeight);
byte[] data = pixprd.DetachPixelData();
data.CopyTo(wb.PixelBuffer);
wb.Invalidate();
list.Add(wb);
}
);
}
time = new System.Threading.Timer(new TimerCallback(timerReport), null, 300, 0);
}
private void Print(string str)
{
System.Diagnostics.Debug.WriteLine(str);
}
System.Threading.Timer time;
private int kindex = 0;
/// <summary>
/// 计时器检查链接和心跳包
/// </summary>
/// <param name="obj"></param>
private async void timerReport(object obj)
{
try
{
time.Change(300, 0);
kindex++;
if (kindex >= 8)
{
kindex = 0;
}
var dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
img.Source = list[kindex];
});
}
catch
{
}
}
问题在于，图片背景是白色的！！！
应是透明的撒，怎么搞？ 谢谢！
代码的意思是，从存储区读取文件，然后通过那个BitmapDecoder读取图片的信息，获得gif的帧数和每一帧的数据，然后存在一个list里面，最后通过时间切换，这是一个简单的例子。很多东西没有附加
/// <summary>
/// 文件的后缀名
/// </summary>
private string filename = "12.gif";
/// <summary>
/// 帧信息的组
/// </summary>
private List<Image> list = new List<Image>();
/// <summary>
/// 共有多少帧
/// </summary>
private int framecount = 0;
/// <summary>
/// 文件下载完成后
/// </summary>
/// <param name="code"></param>
/// <param name="sender"></param>
private async void hf_FileCompeted(int code, object sender)
{
Windows.Storage.StorageFolder localFolder = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFolderAsync("image", Windows.Storage.CreationCollisionOption.OpenIfExists);
IStorageFile fileinto = await localFolder.GetFileAsync(filename);
IRandomAccessStream ias = await fileinto.OpenReadAsync();
BitmapDecoder decoder = await BitmapDecoder.CreateAsync(BitmapDecoder.GifDecoderId, ias);
framecount = (int)decoder.FrameCount;
System.Diagnostics.Debug.WriteLine("总的帧数:" + decoder.FrameCount.ToString());
Print(decoder.PixelHeight + ":" + decoder.PixelWidth);
for (int k = 0; k < (int)decoder.FrameCount; k++)
{
BitmapFrame frame = await decoder.GetFrameAsync((uint)k);
var frameProperties = await frame.BitmapProperties.GetPropertiesAsync(new List<string>());
var imageDescriptionProperties = await (frameProperties["/imgdesc"].Value as BitmapPropertiesView).GetPropertiesAsync(new List<string>() { "/Top", "/Left", "/Width", "/Height" });
int top = Int32.Parse(imageDescriptionProperties["/Top"].Value.ToString());
int left = Int32.Parse(imageDescriptionProperties["/Left"].Value.ToString());
int width = Int32.Parse(imageDescriptionProperties["/Width"].Value.ToString());
int height = Int32.Parse(imageDescriptionProperties["/Height"].Value.ToString());
var gifControlExtensionProperties = await (frameProperties["/grctlext"].Value as BitmapPropertiesView).GetPropertiesAsync(new List<string>() { "/Delay", "/UserInputFlag" });
TimeSpan delay = TimeSpan.FromSeconds(Double.Parse(gifControlExtensionProperties["/Delay"].Value.ToString()) / 100); // delay is in 1/100s of a second
bool userInputFlag = bool.Parse(gifControlExtensionProperties["/UserInputFlag"].Value.ToString());
Print(top+"::"+left+"::"+width+"::"+height);
// 获取像素数据
PixelDataProvider pixprd = await frame.GetPixelDataAsync(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, new BitmapTransform(), ExifOrientationMode.RespectExifOrientation, ColorManagementMode.DoNotColorManage);
Print(frame.DpiX + ":" + frame.DpiY + ":" + frame.OrientedPixelHeight + ":" + frame.OrientedPixelWidth + ":" + frame.PixelHeight + ":" + frame.PixelWidth);
var dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
// 创建新的位图对象
WriteableBitmap wb = new WriteableBitmap((int)frame.PixelWidth, (int)frame.PixelHeight);
byte[] data = pixprd.DetachPixelData();
data.CopyTo(wb.PixelBuffer);
wb.Invalidate();
Image img = new Image();
img.Width = width * 2;
img.Height = height * 2;
img.VerticalAlignment = Windows.UI.Xaml.VerticalAlignment.Top;
img.HorizontalAlignment = Windows.UI.Xaml.HorizontalAlignment.Left;
img.Margin = new Thickness(left * 2, top * 2, 0, 0);
img.Source = wb;
Canvas.SetZIndex(img, k);
list.Add(img);
can.Children.Add(img);
}
);
}
//for (int k = 0; k < (int)decoder.FrameCount; k++)
//{
// // 获取第一帧
// BitmapFrame frame = await decoder.GetFrameAsync((uint)k);
// // 获取像素数据
// PixelDataProvider pixprd = await frame.GetPixelDataAsync(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Straight, new BitmapTransform(), ExifOrientationMode.RespectExifOrientation, ColorManagementMode.DoNotColorManage);
// Print(frame.DpiX+":"+frame.DpiY+":"+frame.OrientedPixelHeight+":"+frame.OrientedPixelWidth+":"+frame.PixelHeight+":"+frame.PixelWidth);
// var dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
// await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
// {
// // 创建新的位图对象
// WriteableBitmap wb = new WriteableBitmap((int)frame.PixelWidth, (int)frame.PixelHeight);
// byte[] data = pixprd.DetachPixelData();
// data.CopyTo(wb.PixelBuffer);
// wb.Invalidate();
// list.Add(wb);
// }
// );
//}
time = new System.Threading.Timer(new TimerCallback(timerReport), null, 300, 0);
}
private void Print(string str)
{
System.Diagnostics.Debug.WriteLine(str);
}
System.Threading.Timer time;
/// <summary>
/// 当前显示第几帧
/// </summary>
private int kindex = 0;
/// <summary>
/// 计时器检查链接和心跳包
/// </summary>
/// <param name="obj"></param>
private async void timerReport(object obj)
{
try
{
time.Change(200, 0);
kindex++;
if (kindex >= framecount)
{
kindex = 0;
}
var dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
await dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
Canvas.SetZIndex(list[kindex],framecount);
if (kindex == 0)
{
Canvas.SetZIndex(list[framecount - 1], 0);
}
else
{
Canvas.SetZIndex(list[kindex-1],0);
}
});
}
catch
{
}
}
就差背景色是白色的问题了，没人来么?
兄弟，印象中gif不支持透明，png才支持，找点资料确认一下，实在不行，自己实现一个gif，用一个timer，多帧循环播。