Struct png::Reader [−][src]
pub struct Reader<R: Read> { /* fields omitted */ }
PNG reader (mostly high-level interface)
Provides a high level that iterates over lines or whole images.
Implementations
impl<R: Read> Reader<R>[src]
impl<R: Read> Reader<R>[src]pub fn info(&self) -> &Info[src]
Get information on the image.
The structure will change as new frames of an animated image are decoded.
pub fn next_frame(&mut self, buf: &mut [u8]) -> Result<(), DecodingError>[src]
Decodes the next frame into buf.
Note that this decodes raw subframes that need to be mixed according to blend-op and dispose-op by the caller.
The caller must always provide a buffer large enough to hold a complete frame (the APNG
specification restricts subframes to the dimensions given in the image header). The region
that has been written be checked afterwards by calling info after a successful call and
inspecting the frame_control data. This requirement may be lifted in a later version of
png.
Output lines will be written in row-major, packed matrix with width and height of the read frame (or subframe), all samples are in big endian byte order where this matters.
pub fn next_row(&mut self) -> Result<Option<&[u8]>, DecodingError>[src]
Returns the next processed row of the image
pub fn next_interlaced_row(
&mut self
) -> Result<Option<(&[u8], Option<(u8, u32, u32)>)>, DecodingError>[src]
&mut self
) -> Result<Option<(&[u8], Option<(u8, u32, u32)>)>, DecodingError>
Returns the next processed row of the image
pub fn output_color_type(&mut self) -> (ColorType, BitDepth)[src]
Returns the color type and the number of bits per sample
of the data returned by Reader::next_row and Reader::frames`.
pub fn output_buffer_size(&self) -> usize[src]
Returns the number of bytes required to hold a deinterlaced image frame that is decoded using the given input transformations.
pub fn output_line_size(&self, width: u32) -> usize[src]
Returns the number of bytes required to hold a deinterlaced row.
Auto Trait Implementations
impl<R> RefUnwindSafe for Reader<R> where
R: RefUnwindSafe,
R: RefUnwindSafe,
impl<R> Send for Reader<R> where
R: Send,
R: Send,
impl<R> Sync for Reader<R> where
R: Sync,
R: Sync,
impl<R> Unpin for Reader<R> where
R: Unpin,
R: Unpin,
impl<R> UnwindSafe for Reader<R> where
R: UnwindSafe,
R: UnwindSafe,