windows-phone-7 - 动态 LiveTile - 使用后台任务在 LiveTile 上渲染自定义字体 TextBlock

Question

我在 liveTile 上使用自定义字体资源呈现自定义文本块时遇到问题？

我的项目在后台更新动态磁贴。但它应该是个性化的。

我正在使用此代码。但它不起作用，当我尝试使用嵌入字体时，文本显示为空白
位图背景工作得很好。但字体不起作用。

当我在“前台代理”中使用相同的代码时，字体显示完美。

Grid grid = new Grid();

// load your image 
StreamResourceInfo info = Application.GetResourceStream(new Uri("tile.jpg", UriKind.Relative));

// create source bitmap for Image control (image is assumed to be alread 173x173)
WriteableBitmap wbmp2 = new WriteableBitmap(1, 1);
wbmp2.SetSource(info.Stream);
Image img = new Image();
img.Source = wbmp2;

// add Image to Grid
grid.Children.Add(img);

TextBlock text = new TextBlock() 
{
    FontFamily = new FontFamily("/MyTaskAgent;component/Fonts/Fonts.zip#Buxton Sketch"),
    Foreground = new SolidColorBrush(Colors.Black) ,
    TextWrapping = TextWrapping.Wrap,
};

text.Text = "Test";

// this is our final image containing custom text and image
WriteableBitmap wbmp = new WriteableBitmap(173, 173);

// now render everything - this image can be used as background for tile
wbmp.Render(grid, null);
wbmp.Invalidate();

Answer 1

我遇到了类似的问题，并找到了解决方案，请查看 here或 here

我归结为任一
1.在进行转换之前创建一个使用字体的隐藏文本块，或
2. 创建一个 FontSource。

我使用第一个，因为它现在更简单。

文本块是隐藏的，但它确保加载嵌入的字体。

在我的控件中，我添加了以下内容:

void Grid_Loaded(object sender, RoutedEventArgs e) {
#if SILVERLIGHT
    Grid Grid = (Grid)sender;
    AddFontLoaderTextBox(Grid, "Signs Road Features");
    AddFontLoaderTextBox(Grid, "Signs G Old");
    AddFontLoaderTextBox(Grid, "Signs G");
    AddFontLoaderTextBox(Grid, "Signs G1");
    AddFontLoaderTextBox(Grid, "Signs G2");
    AddFontLoaderTextBox(Grid, "Signs G3");
    AddFontLoaderTextBox(Grid, "Signs Info");
    AddFontLoaderTextBox(Grid, "Signs Regulatory");
    AddFontLoaderTextBox(Grid, "Signs Regulatory1");
    AddFontLoaderTextBox(Grid, "Road Manager");
    AddFontLoaderTextBox(Grid, "Signs Temporary");
    AddFontLoaderTextBox(Grid, "Road Manager");
    AddFontLoaderTextBox(Grid, "Signs Warning");
    AddFontLoaderTextBox(Grid, "Signs Warning1");
#endif
}

#if SILVERLIGHT
void AddFontLoaderTextBox(Grid Grid, string fontName) {

    TextBlock TextBlock = new TextBlock();
    TextBlock.FontFamily = new FontFamily(string.Format(
        "pack://application:,,,/ITIS.Controls.LinearViewer.Silverlight;component/Fonts/{0}.ttf#{0}", fontName));
    TextBlock.Opacity = 0; /* hide the text block, we only load it for the font to be cached */
    Grid.SetRowSpan(TextBlock, 3); /* just to ensure the text block doesn't affect the size of the first row */
    Grid.Children.Insert(0, TextBlock); /* keep underneath other children */
}
#endif