我正在尝试将 BitmapSource 的一部分复制到 WritableBitmap。
到目前为止,这是我的代码:
var bmp = image.Source as BitmapSource;
var row = new WriteableBitmap(bmp.PixelWidth, bottom - top, bmp.DpiX, bmp.DpiY, bmp.Format, bmp.Palette);
row.Lock();
bmp.CopyPixels(new Int32Rect(top, 0, bmp.PixelWidth, bottom - top), row.BackBuffer, row.PixelHeight * row.BackBufferStride, row.BackBufferStride);
row.AddDirtyRect(new Int32Rect(0, 0, row.PixelWidth, row.PixelHeight));
row.Unlock();
我收到“ArgumentException:值不在预期范围内。”在 CopyPixels
行中。
我尝试将 row.PixelHeight * row.BackBufferStride
与 row.PixelHeight * row.PixelWidth
交换,但随后我收到一条错误消息,指出该值太低。
我找不到使用 CopyPixels
重载的单个代码示例,所以我寻求帮助。
谢谢!
最佳答案
试图复制图像的哪一部分?更改 objective-c tor 中的宽度和高度,Int32Rect 中的宽度和高度以及前两个参数 (0,0),它们是图像中的 x 和 y 偏移量。或者如果你想复制整个东西就离开。
BitmapSource source = sourceImage.Source as BitmapSource;
// Calculate stride of source
int stride = source.PixelWidth * (source.Format.BitsPerPixel + 7) / 8;
// Create data array to hold source pixel data
byte[] data = new byte[stride * source.PixelHeight];
// Copy source image pixels to the data array
source.CopyPixels(data, stride, 0);
// Create WriteableBitmap to copy the pixel data to.
WriteableBitmap target = new WriteableBitmap(
source.PixelWidth,
source.PixelHeight,
source.DpiX, source.DpiY,
source.Format, null);
// Write the pixel data to the WriteableBitmap.
target.WritePixels(
new Int32Rect(0, 0, source.PixelWidth, source.PixelHeight),
data, stride, 0);
// Set the WriteableBitmap as the source for the <Image> element
// in XAML so you can see the result of the copy
targetImage.Source = target;
关于c# - 从 BitmapSource 复制到 WriteableBitmap,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5867657/