static void AnimateImages50ms()
{
for (int i = 0; i < images.Count; i++)
{
ImageInfo image = (ImageInfo)images[i];
// Frame delay is measured in 1/100ths of a second. This thread
// sleeps for 50 ms = 5/100ths of a second between frame updates,
// so we increase the frame delay count 5/100ths of a second
// at a time.
//
image.FrameTimer += 5;
if (image.FrameTimer >= image.FrameDelay(image.Frame))
{
image.FrameTimer = 0;
if (image.Frame + 1 < image.FrameCount)
{
image.Frame++;
}
else
{
image.Frame = 0;
}
}
}
}
/// <summary>
/// Worker thread procedure which implements the main animation loop.
/// NOTE: This is the ONLY code the worker thread executes, keeping it in one method helps better understand
/// any synchronization issues.
/// WARNING: Also, this is the only place where ImageInfo objects (not the contained image object) are modified,
/// so no access synchronization is required to modify them.
/// </summary>
private static void AnimateImages50ms()
{
Debug.Assert(s_imageInfoList != null, "Null images list");
while (true)
{
// Acquire reader-lock to access imageInfoList, elemens in the list can be modified w/o needing a writer-lock.
// Observe that we don't need to check if the thread is waiting or a writer lock here since the thread this
// method runs in never acquires a writer lock.
s_rwImgListLock.AcquireReaderLock(Timeout.Infinite);
try
{
for (int i = 0; i < s_imageInfoList.Count; i++)
{
ImageInfo imageInfo = s_imageInfoList[i];
// Frame delay is measured in 1/100ths of a second. This thread
// sleeps for 50 ms = 5/100ths of a second between frame updates,
// so we increase the frame delay count 5/100ths of a second
// at a time.
//
imageInfo.FrameTimer += 5;
if (imageInfo.FrameTimer >= imageInfo.FrameDelay(imageInfo.Frame))
{
imageInfo.FrameTimer = 0;
if (imageInfo.Frame + 1 < imageInfo.FrameCount)
{
imageInfo.Frame++;
}
else
{
imageInfo.Frame = 0;
}
if (imageInfo.FrameDirty)
{
s_anyFrameDirty = true;
}
}
}
}
finally
{
s_rwImgListLock.ReleaseReaderLock();
}
Thread.Sleep(50);
}
}
private static void AnimateImages50ms()
{
while (true)
{
rwImgListLock.AcquireReaderLock(-1);
try
{
for (int i = 0; i < imageInfoList.Count; i++)
{
ImageInfo info = imageInfoList[i];
info.FrameTimer += 5;
if (info.FrameTimer >= info.FrameDelay(info.Frame))
{
info.FrameTimer = 0;
if ((info.Frame + 1) < info.FrameCount)
{
info.Frame++;
}
else
{
info.Frame = 0;
}
if (info.FrameDirty)
{
anyFrameDirty = true;
}
}
}
}
finally
{
rwImgListLock.ReleaseReaderLock();
}
Thread.Sleep(50);
}
}