BitmapDecoder Class

Reference

Definition

Namespace:: Windows.Graphics.Imaging

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Edit

Provides read access to bitmap container data as well as data from the first frame.

public ref class BitmapDecoder sealed : IBitmapFrameWithSoftwareBitmap

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
class BitmapDecoder final : IBitmapFrameWithSoftwareBitmap

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
public sealed class BitmapDecoder : IBitmapFrameWithSoftwareBitmap

Public NotInheritable Class BitmapDecoder
Implements IBitmapFrameWithSoftwareBitmap

Inheritance: Object Platform::Object IInspectable BitmapDecoder

Attributes: ContractVersionAttribute MarshalingBehaviorAttribute

Implements: IBitmapFrame IBitmapFrameWithSoftwareBitmap

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

Here's a partial example of creating a decoder object. This example assumes you selected a file with Windows.Storage.Pickers.FileOpenPicker. For full instructions on selecting a file, creating an decoder, and decoding an image see Imaging

FileOpenPicker fileOpenPicker = new FileOpenPicker();
fileOpenPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
fileOpenPicker.FileTypeFilter.Add(".jpg");
fileOpenPicker.ViewMode = PickerViewMode.Thumbnail;

var inputFile = await fileOpenPicker.PickSingleFileAsync();

if (inputFile == null)
{
    // The user cancelled the picking operation
    return;
}

SoftwareBitmap softwareBitmap;

using (IRandomAccessStream stream = await inputFile.OpenAsync(FileAccessMode.Read))
{
    // Create the decoder from the stream
    BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);

    // Get the SoftwareBitmap representation of the file
    softwareBitmap = await decoder.GetSoftwareBitmapAsync();
}

Remarks

Image formats

BitmapDecoder can decode the following formats.

JPEG
PNG
GIF
TIFF
BMP
ICO
JPEG-XR
Any installed Camera raw formats by using the Microsoft Camera Codec Pack.

For a list of decoding formats, see the BitmapEncoder topic.

The BitmapDecoder class implements IBitmapFrame. It provides access to container data as well as data from the first frame. This allows applications to accomplish most common scenarios without needing to retrieve a separate BitmapFrame.

Version history

Windows version	SDK version	Value added
1809	17763	HeifDecoderId
1809	17763	WebpDecoderId

Properties

BitmapAlphaMode	The default alpha mode of the first frame.
BitmapContainerProperties	Provides access to the container bitmap properties.
BitmapPixelFormat	The pixel format that best fits the first frame.
BitmapProperties	A read-only view of the metadata within the first frame.
BmpDecoderId	The unique identifier of the BMP decoder.
DecoderInformation	Information about the bitmap decoder.
DpiX	The horizontal resolution of the first frame in dots per inch.
DpiY	The vertical resolution of the first frame in dots per inch.
FrameCount	The number of frames within the image file.
GifDecoderId	The unique identifier of the GIF decoder.
HeifDecoderId	The unique identifier of the HEIF decoder.
IcoDecoderId	The unique identifier of the ICO decoder.
JpegDecoderId	The unique identifier of the JPEG decoder.
JpegXRDecoderId	The unique identifier of the JPEG-XR decoder.
OrientedPixelHeight	The height of the first frame in pixels, after any EXIF orientation has been applied to the bitmap.
OrientedPixelWidth	The width of the first frame in pixels, after any EXIF orientation has been applied to the bitmap.
PixelHeight	The height of the first frame in pixels.
PixelWidth	The width of the first frame in pixels.
PngDecoderId	The unique identifier of the PNG decoder.
TiffDecoderId	The unique identifier of the TIFF decoder.
WebpDecoderId	The unique identifier of the WebP decoder.

Methods

CreateAsync(Guid, IRandomAccessStream)	Asynchronously creates a new BitmapDecoder using a specific bitmap codec and initializes it using a stream.
CreateAsync(IRandomAccessStream)	Asynchronously creates a new BitmapDecoder and initializes it using a stream.
GetDecoderInformationEnumerator()	The bitmap decoders installed on the system and information about them.
GetFrameAsync(UInt32)	Asynchronously retrieves a frame from the image file.
GetPixelDataAsync()	Asynchronously requests the pixel data for the frame.
GetPixelDataAsync(BitmapPixelFormat, BitmapAlphaMode, BitmapTransform, ExifOrientationMode, ColorManagementMode)	Asynchronously requests the pixel data for the frame using the specified parameters.
GetPreviewAsync()	Asynchronously returns a stream containing the preview image.
GetSoftwareBitmapAsync()	Asynchronously gets a SoftwareBitmap representation of the decoded bitmap.
GetSoftwareBitmapAsync(BitmapPixelFormat, BitmapAlphaMode, BitmapTransform, ExifOrientationMode, ColorManagementMode)	Asynchronously gets a SoftwareBitmap representation of the decoded bitmap.
GetSoftwareBitmapAsync(BitmapPixelFormat, BitmapAlphaMode)	Asynchronously gets a SoftwareBitmap representation of the decoded bitmap.
GetThumbnailAsync()	Asynchronously returns a stream containing the thumbnail image.

Applies to

Delen via