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我正在尝试使用 Lumia Imaging SDK 的JpegTools.BlendAsync()方法创建平铺背景。我在循环中调用该方法以合并所有平铺图像。该方法有效，但输出图像中有不需要的线条。这些分隔线出现在单个平铺图像的边界处；合并不干净。

附上我的代码。我在逻辑上做错了什么还是这是 SDK 中的错误？

bitmapSource是单个图块，jpegSource是由图块填充的空布局，是bgSize背景尺寸的大小。 

async private static Task<IBuffer> CreateTile(IBuffer jpegSource, IReadableBitmap bitmapSource, Size tileSize, Size bgSize)
        {
            int outBgWidth = (int)bgSize.Width;
            int outBgHeight = (int)bgSize.Height;
            int tileWidth = (int)tileSize.Width;
            int tileHeight = (int)tileSize.Height;

            int currentBgWidth = 0;
            int currentBgHeight = 0;

            Point blendPosition = new Point(0, 0);

            while (currentBgHeight < outBgHeight)
            {
                while (currentBgWidth < outBgWidth)
                {
                    jpegSource = await JpegTools.BlendAsync(jpegSource, bitmapSource, blendPosition);
                    blendPosition.X += tileWidth;
                    currentBgWidth += tileWidth;
                }
                blendPosition.Y += tileHeight;
                currentBgHeight += tileHeight;
                currentBgWidth = 0;
                blendPosition.X = 0;
            }

            return jpegSource;
        }
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1 回答 1

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正如评论中所讨论的，我建议使用另一种方法：使用更“标准”的渲染链，而不是使用 JpegTools。

其中一些基于您的代码示例，但我已尝试使其尽可能通用。

int outBgWidth = (int)bgSize.Width;
int outBgHeight = (int)bgSize.Height;
int tileWidth = (int)tileSize.Width;
int tileHeight = (int)tileSize.Height;

int currentBgWidth = 0;
int currentBgHeight = 0;

Point blendPosition = new Point(0, 0);

using (var backgroundCanvas = new ColorImageSource(new Size(outBgWidth, outBgHeight), Color.FromArgb(255, 0, 0, 0)))  //Create a black canvas with the output size.
using (var tileSource = new BitmapImageSource(bitmapSource))
using (var renderer = new JpegRenderer(backgroundCanvas))
{
    while (currentBgHeight < outBgHeight)
    {
        while (currentBgWidth < outBgWidth)
        {
            var blendEffect = new BlendEffect();
            blendEffect.BlendFunction = BlendFunction.Normal;
            blendEffect.GlobalAlpha = 1.0;

            blendEffect.Source = renderer.Source;
            blendEffect.ForegroundSource = tileSource;
            blendEffect.TargetArea = new Rect(blendPosition, new Size(0, 0));   //Since we are PreservingSize the size doesn't matter. Otherwise it must be in relative coordinate space!
            blendEffect.TargetOutputOption = OutputOption.PreserveSize;

            renderer.Source = blendEffect;

            currentBgWidth += tileWidth;
            blendPosition.X = (double)currentBgWidth / (double)outBgWidth;  //Careful, the target area is in relative coordinates
        }

        currentBgHeight += tileHeight;
        blendPosition.Y = (double)currentBgHeight / (double)outBgHeight;    //Careful, the target area is in relative coordinates
        blendPosition.X = 0.0;
        currentBgWidth = 0;
    }

    var result = await renderer.RenderAsync();   //An IBuffer containing the Jpeg file
}

我已在示例中尝试过此解决方案，但看不到任何工件。请务必回来报告您的结果！

于 2015-07-21T09:40:40.107 回答