pub struct JpegDecoder<R> { /* private fields */ }
Expand description

JPEG decoder

Implementations

Create a new decoder that decodes from the stream r

Configure the decoder to scale the image during decoding.

This efficiently scales the image by the smallest supported scale factor that produces an image larger than or equal to the requested size in at least one axis. The currently implemented scale factors are 1/8, 1/4, 1/2 and 1.

To generate a thumbnail of an exact size, pass the desired size and then scale to the final size using a traditional resampling algorithm.

The size of the image to be loaded, with the scale factor applied, is returned.

Trait Implementations

The type of reader produced by into_reader.

Returns a tuple containing the width and height of the image

Returns the color type of the image data produced by this decoder

Returns a reader that can be used to obtain the bytes of the image. For the best performance, always try to read at least scanline_bytes from the reader at a time. Reading fewer bytes will cause the reader to perform internal buffering. Read more

Returns all the bytes in the image. Read more

Retuns the color type of the image file before decoding

Returns the total number of bytes in the decoded image. Read more

Returns the minimum number of bytes that can be efficiently read from this decoder. This may be as few as 1 or as many as total_bytes(). Read more

Same as read_image but periodically calls the provided callback to give updates on loading progress. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The alignment of pointer.

The type for initializers.

Initializes a with the given initializer. Read more

Dereferences the given pointer. Read more

Mutably dereferences the given pointer. Read more

Drops the object pointed to by the given pointer. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.