C# 实现APNG渲染功能
大家好,, 因此,我目前正在尝试实现,但在帧渲染方面遇到了一些问题。我的职能是C# 实现APNG渲染功能,c#,winforms,render,apng,C#,Winforms,Render,Apng,大家好,, 因此,我目前正在尝试实现,但在帧渲染方面遇到了一些问题。我的职能是 private void UpdateUI() { foreach (PictureBox pb in pics) { APNGBox box = (APNGBox)pb.Tag; APNGLib.APNG png = box.png; if (box.buffer == null)
private void UpdateUI()
{
foreach (PictureBox pb in pics)
{
APNGBox box = (APNGBox)pb.Tag;
APNGLib.APNG png = box.png;
if (box.buffer == null)
{
box.buffer = new Bitmap((int)png.Width, (int)png.Height);
}
APNGLib.Frame f = png.GetFrame(box.frameNum);
using (Graphics g = Graphics.FromImage(box.buffer))
{
switch (f.DisposeOp)
{
case APNGLib.Frame.DisposeOperation.NONE:
break;
case APNGLib.Frame.DisposeOperation.BACKGROUND:
g.Clear(Color.Transparent);
break;
case APNGLib.Frame.DisposeOperation.PREVIOUS:
if (box.prevBuffer != null)
{
g.DrawImage(box.prevBuffer, Point.Empty);
}
else
{
g.Clear(Color.Transparent);
}
break;
default:
break;
}
Bitmap read = png.ToBitmap(box.frameNum++);
switch (f.BlendOp)
{
case APNGLib.Frame.BlendOperation.OVER:
g.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;
break;
case APNGLib.Frame.BlendOperation.SOURCE:
g.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
break;
default:
break;
}
g.DrawImage(read, new Point((int)f.XOffset, (int)f.YOffset));
}
box.prevBuffer = box.buffer;
pb.Image = box.buffer;
if (box.frameNum >= box.png.FrameCount)
{
box.frameNum = 0;
box.buffer = null;
box.prevBuffer = null;
}
}
}
APNGBox
是
internal class APNGBox
{
public int frameNum = 0;
public APNGLib.APNG png;
public Bitmap buffer;
public Bitmap prevBuffer;
}
我认为这基本上是正确的,因为我已经将它运行在所有的图像中。但是,其中一些渲染不正确(一个存在伪影问题,另一个没有始终保留左侧的红色条)。请注意,您可以在Firefox3或更高版本中查看页面以查看动画
我相信这个问题与我如何处理之前的处置有关,但我不知道我做错了什么。有人能建议我可能遗漏了什么吗?因此,我最终能够找到答案,并将在这里发布,以防将来有人遇到类似问题。事实证明,问题主要有三个方面:
internal class APNGBox
{
public int frameNum { get; set; }
public APNGLib.APNG apng { get; set; }
public Bitmap buffer { get; set; }
public Bitmap prevBuffer { get; set; }
public APNGBox(APNGLib.APNG png)
{
frameNum = 0;
apng = png;
buffer = apng.ToBitmap(0);
prevBuffer = null;
}
}
private void UpdateUI()
{
foreach (PictureBox pb in pics)
{
APNGBox box = (APNGBox)pb.Tag;
APNGLib.APNG png = box.apng;
if (!png.IsAnimated)
{
if (pb.Image == null)
{
pb.Image = png.ToBitmap();
}
}
else
{
if (box.frameNum != png.FrameCount - 1)
{
Bitmap prev = box.prevBuffer == null ? null : new Bitmap(box.prevBuffer);
APNGLib.Frame f1 = png.GetFrame(box.frameNum);
if (f1.DisposeOp != APNGLib.Frame.DisposeOperation.PREVIOUS)
{
box.prevBuffer = new Bitmap(box.buffer);
}
DisposeBuffer(box.buffer, new Rectangle((int)f1.XOffset, (int)f1.YOffset, (int)f1.Width, (int)f1.Height), f1.DisposeOp, prev);
box.frameNum++;
APNGLib.Frame f2 = png.GetFrame(box.frameNum);
RenderNextFrame(box.buffer, new Point((int)f2.XOffset, (int)f2.YOffset), png.ToBitmap(box.frameNum), f2.BlendOp);
}
else
{
box.frameNum = 0;
box.prevBuffer = null;
ClearFrame(box.buffer);
RenderNextFrame(box.buffer, Point.Empty, png.ToBitmap(box.frameNum), APNGLib.Frame.BlendOperation.SOURCE);
}
pb.Invalidate();
}
}
}
private void DisposeBuffer(Bitmap buffer, Rectangle region, APNGLib.Frame.DisposeOperation dispose, Bitmap prevBuffer)
{
using (Graphics g = Graphics.FromImage(buffer))
{
g.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
Brush b = new SolidBrush(Color.Transparent);
switch (dispose)
{
case APNGLib.Frame.DisposeOperation.NONE:
break;
case APNGLib.Frame.DisposeOperation.BACKGROUND:
g.FillRectangle(b, region);
break;
case APNGLib.Frame.DisposeOperation.PREVIOUS:
if(prevBuffer != null)
{
g.FillRectangle(b, region);
g.DrawImage(prevBuffer, region, region, GraphicsUnit.Pixel);
}
break;
default:
break;
}
}
}
private void RenderNextFrame(Bitmap buffer, Point point, Bitmap nextFrame, APNGLib.Frame.BlendOperation blend)
{
using(Graphics g = Graphics.FromImage(buffer))
{
switch(blend)
{
case APNGLib.Frame.BlendOperation.OVER:
g.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceOver;
break;
case APNGLib.Frame.BlendOperation.SOURCE:
g.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
break;
default:
break;
}
g.DrawImage(nextFrame, point);
}
}
private void ClearFrame(Bitmap buffer)
{
using(Graphics g = Graphics.FromImage(buffer))
{
g.Clear(Color.Transparent);
}
}
您好,您是否有完整的工作源代码提供请?我想在我的winforms应用程序中显示apng。谢谢。我上次做这些已经有一段时间了,但我在这里编了一些演示:。另外,我很确定我当时是.net/C的新手,所以依赖项没有NuGet(不过我应该在某个时候这样做)@dede刚刚添加了NuGet支持。APNGViewer应用程序应该对您有用