Windows Phone 8 blitting [英] Windows Phone 8 blitting

问题描述

Windows Phone 8（不是7.5）上是否可以进行blitting操作？我还没找到方法。我需要根据资产资源中的图像创建一个图像并对其进行blitting。那么。

  //  加载源图像 
 BitmapImage bi =  new  BitmapImage（ new  Uri（   / Assets / skin_01.png，UriKind.Relative））; 
 
  //  创建新位图 
 WriteableBitmap wa_bmp =  new  WriteableBitmap（ 64 ， 64 ）; 
 
  //  如何从bi到wa_bmp进行blitting ???  

谢谢。

解决方案

 < span class =code-keyword> private   void  CopyImageRect（WriteableBitmap dest，WriteableBitmap source， int  xd， int  yd， int  xs， int  ys， int  dx， int  dy）{
  int  dxd = dest.PixelWidth; 
  int  dxs = source.PixelWidth; 
  int  y，x; 
  for （y =  0 ; y < ;  dy; y ++）{
  for （x =  0 ; x < span class =code-keyword><  dx; x ++）{
 dest.Pixels [（y + yd）* dxd + xd + x] = source.Pixels [（y + ys） * dxs + xs + x]; 
} 
} 
} 
  //  示例 
  //  从资产加载图片 
 BitmapImage source_wb =  new  BitmapImage（ new  Uri（  / Assets / my_image.png，UriKind.Relative））; 
  //  警告下一行非常重要 
 bi.CreateOptions = BitmapCreateOptions。没有; 
 
 WriteableBitmap dest_wb =  new  WriteableBitmap（ 64 ， 64 ）; 
  //   blitting  
 CopyImageRect（dest_wb，source_wb， 64 ， 0 ， 0 ， 0 ， 64 ， 64 ）; 

Is blitting operation available on Windows Phone 8 (not 7.5)? I have not found way. I need create an image and blitting to it from images in 'assets' resources. So.

//load source image
BitmapImage bi = new BitmapImage( new Uri("/Assets/skin_01.png", UriKind.Relative) );

//create new bitmap
WriteableBitmap wa_bmp = new WriteableBitmap( 64, 64);

//how to blitting from bi to wa_bmp ???

Thank you.

解决方案

private void CopyImageRect( WriteableBitmap dest, WriteableBitmap source, int xd, int yd, int xs, int ys, int dx, int dy ){
    int dxd = dest.PixelWidth;
    int dxs = source.PixelWidth;
    int y,x;
    for( y = 0; y < dy; y++){
        for( x = 0; x < dx ; x++){
            dest.Pixels[ (y+yd)*dxd + xd + x  ] = source.Pixels[ (y+ys)*dxs + xs + x ];
        }
    }
}
//EXAMPLE
//load image from assets
BitmapImage source_wb = new BitmapImage( new Uri("/Assets/my_image.png", UriKind.Relative) );
// WARNING this next line very important
bi.CreateOptions = BitmapCreateOptions.None;

WriteableBitmap dest_wb = new WriteableBitmap( 64, 64 );
//blitting
CopyImageRect( dest_wb, source_wb, 64, 0, 0, 0, 64, 64);

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