Texture2D.GetData Generic Method (Int32, Nullable<Rectangle>, T , Int32, Int32)

项目
08/15/2012

Gets a copy of 2D texture data, specifying a mipmap level, source rectangle, start index, and number of elements.

Syntax

'Declaration
Public Sub GetData(Of T As ValueType) ( _
         level As Integer, _
         rect As Nullable(Of Rectangle), _
         data As T(), _
         startIndex As Integer, _
         elementCount As Integer _
)

public void GetData<T> (
         int level,
         Nullable<Rectangle> rect,
         T[] data,
         int startIndex,
         int elementCount
) where T : ValueType

public:
generic<typename T> where T : ValueType
void GetData(
         int level,
         Nullable<Rectangle> rect,
         T data[],
         int startIndex,
         int elementCount
)

Type Parameters

T
The type of the elements in the array. This is usually a Microsoft.Xna.Framework.Graphics.PackedVector type but it can be any fundamental type that matches the bit size of the surface format.

Parameters

level
Type: Int32
Mipmap level.
rect
Type: Nullable<Rectangle>
The section of the texture to copy. null indicates the data will be copied from the entire texture.
data
Type: T
Array of data.
startIndex
Type: Int32
Index of the first element to get.
elementCount
Type: Int32
Number of elements to get.

Exceptions

Exception type	Condition
ArgumentNullException	data must be of sufficient length to receive the data.
InvalidOperationException	The vertex stride is larger than the vertex buffer, or the vertex stride is too small for the type of data requested.

Example

In this example, the color of the pixel beneath the mouse is retrieved from the back buffer.

sourceTexture.SetData<Color>(sourceColorData);

// Initialize a texture with texture data from another texture
sourceTexture.GetData<Color>(destinationColorData);
destinationTexture.SetData<Color>(destinationColorData);
if (Mouse.GetState().LeftButton == ButtonState.Pressed &&
    // If the left button is pressed
    Mouse.GetState().X > 0 && Mouse.GetState().Y > 0 &&
    // and we are inside the game window
    (Mouse.GetState().X <
    GraphicsDevice.PresentationParameters.BackBufferWidth) &&
    (Mouse.GetState().Y <
    GraphicsDevice.PresentationParameters.BackBufferHeight))
{
    backBufferData = new Texture2D(
        GraphicsDevice,
        GraphicsDevice.PresentationParameters.BackBufferWidth,
        GraphicsDevice.PresentationParameters.BackBufferHeight);

    Rectangle sourceRectangle =
        new Rectangle(Mouse.GetState().X, Mouse.GetState().Y, 1, 1);

    Color[] retrievedColor = new Color[1];

    backBufferData.GetData<Color>(
        0,
        sourceRectangle,
        retrievedColor,
        0,
        1);
}

Requirements

Namespace: Microsoft.Xna.Framework.Graphics

Assembly: Microsoft.Xna.Framework.Graphics (in microsoft.xna.framework.graphics.dll)

Platforms

Windows Phone

通过