从表单中获取特定大小的矩形

Question

我可以从我的表单（backbufferdata）中获取“截图”，但它是否可以只占用它的一部分？比方说，如果我的表格是1600x800像素，是否有可能只获得100x100像素？

int w = GraphicsDevice.PresentationParameters.BackBufferWidth;
int h = GraphicsDevice.PresentationParameters.BackBufferHeight;

//pull the picture from the buffer 
int[] backBuffer = new int[w * h];
GraphicsDevice.GetBackBufferData(backBuffer);

//copy into a texture 
Texture2D texture = new Texture2D(GraphicsDevice, w, h, true, GraphicsDevice.PresentationParameters.BackBufferFormat);
texture.SetData(backBuffer);

如果我更改宽度和高度，则会出现错误“它太小或太大”。

Answer 1

尝试使用 GraphicsDevice.GetBackBufferData Generic Method（Nullable，T []，Int32，Int32）

例如：

int posX = 0; // area position
int posY = 0;
int w = 200;  // area size
int h = 100;

//pull the picture from the buffer 
int[] backBuffer = new int[w * h];
GraphicsDevice.GetBackBufferData(new Rectangle(posX, posY, w, h), backBuffer, 0, w*h );

//copy into a texture 
Texture2D texture = new Texture2D(GraphicsDevice, w, h, true, GraphicsDevice.PresentationParameters.BackBufferFormat);
texture.SetData(backBuffer);