C# 将CogImage8Grey图片通过操作内存指针转化为Bitmap
时间: 2024-03-15 17:44:51 浏览: 380
要将`CogImage8Grey`转换为`Bitmap`,可以使用以下步骤:
1. 获取`CogImage8Grey`对象的宽度和高度。
```csharp
int width = cogImage8Grey.Width;
int height = cogImage8Grey.Height;
```
2. 创建一个`Bitmap`对象。
```csharp
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format8bppIndexed);
```
3. 获取`Bitmap`对象的`BitmapData`。
```csharp
BitmapData data = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, bitmap.PixelFormat);
```
4. 获取`CogImage8Grey`对象的内存指针。
```csharp
IntPtr ptr = cogImage8Grey.Get8GreyPixelPointer();
```
5. 将`CogImage8Grey`对象的像素数据复制到`Bitmap`对象的内存指针中。
```csharp
unsafe
{
byte* p = (byte*)data.Scan0;
byte* src = (byte*)ptr;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
p[x] = src[x];
}
p += data.Stride;
src += cogImage8Grey.Stride;
}
}
```
6. 释放`BitmapData`。
```csharp
bitmap.UnlockBits(data);
```
完整示例代码如下:
```csharp
int width = cogImage8Grey.Width;
int height = cogImage8Grey.Height;
Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format8bppIndexed);
BitmapData data = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.WriteOnly, bitmap.PixelFormat);
IntPtr ptr = cogImage8Grey.Get8GreyPixelPointer();
unsafe
{
byte* p = (byte*)data.Scan0;
byte* src = (byte*)ptr;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
p[x] = src[x];
}
p += data.Stride;
src += cogImage8Grey.Stride;
}
}
bitmap.UnlockBits(data);
```
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