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use openexr_sys as sys;
use crate::{
core::{error::Error, header::HeaderRef, preview_image::PreviewRgba},
deep::{
deep_frame_buffer::{DeepFrameBuffer, DeepFrameBufferRef},
deep_scan_line_input_file::DeepScanLineInputFile,
deep_scan_line_input_part::DeepScanLineInputPart,
},
multi_part::multi_part_output_file::MultiPartOutputFile,
};
type Result<T, E = Error> = std::result::Result<T, E>;
use std::marker::PhantomData;
#[repr(transparent)]
pub struct DeepScanLineOutputPart<'a> {
pub(crate) inner: sys::Imf_DeepScanLineOutputPart_t,
phantom: std::marker::PhantomData<&'a MultiPartOutputFile>,
}
impl<'a> DeepScanLineOutputPart<'a> {
/// Get an interface to the part `part_number` of the [`MultiPartOutputFile`]
/// `multi_part_file`.
///
pub fn new(
multi_part_file: &MultiPartOutputFile,
part_number: i32,
) -> Result<DeepScanLineOutputPart> {
let mut part = sys::Imf_DeepScanLineOutputPart_t::default();
unsafe {
sys::Imf_DeepScanLineOutputPart_ctor(
&mut part,
multi_part_file.0,
part_number,
)
.into_result()?;
}
Ok(DeepScanLineOutputPart {
inner: part,
phantom: PhantomData,
})
}
/// Get the filename this file is writing to.
///
pub fn file_name(&self) -> &str {
unsafe {
let mut ptr = std::ptr::null();
sys::Imf_DeepScanLineOutputPart_fileName(&self.inner, &mut ptr)
.into_result()
.unwrap();
std::ffi::CStr::from_ptr(ptr)
.to_str()
.expect("Invalid UTF-8")
}
}
/// Access to the file [`Header`](crate::core::header::Header)
///
pub fn header(&self) -> HeaderRef {
unsafe {
let mut ptr = std::ptr::null();
sys::Imf_DeepScanLineOutputPart_header(&self.inner, &mut ptr);
if ptr.is_null() {
panic!("Received null ptr from sys::Imf_DeepScanLineOutputPart_header");
}
HeaderRef::new(ptr)
}
}
/// Set the current frame buffer -- copies the [`DeepFrameBuffer`]
/// object into the [`DeepScanLineOutputPart`] object.
///
/// The current frame buffer is the source of the pixel
/// data written to the file. The current frame buffer
/// must be set at least once before [`DeepScanLineOutputPart::write_pixels`] is
/// called. The current frame buffer can be changed
/// after each call to [`DeepScanLineOutputPart::write_pixels`].
///
/// ## Errors
/// * [`Error::InvalidArgument`] - If the pixel type of the [`Channel`](crate::core::channel_list::Channel)s in the [`Header`](crate::core::header::Header)
/// do not match the types in the frame buffer, or if the sampling rates do
/// not match.
///
pub fn set_frame_buffer(
&mut self,
frame_buffer: &DeepFrameBuffer,
) -> Result<()> {
unsafe {
sys::Imf_DeepScanLineOutputPart_setFrameBuffer(
&mut self.inner,
frame_buffer.ptr,
)
.into_result()?;
}
Ok(())
}
/// Get a reference to the frame buffer.
///
pub fn frame_buffer(&self) -> DeepFrameBufferRef {
unsafe {
let mut ptr = std::ptr::null();
sys::Imf_DeepScanLineOutputPart_frameBuffer(&self.inner, &mut ptr);
if ptr.is_null() {
panic!(
"Received null ptr from sys::Imf_DeepScanLineOutputPart_frameBuffer"
);
}
DeepFrameBufferRef::new(ptr)
}
}
/// Write pixel data.
///
/// Retrieves the next `num_scan_lines` worth of data from
/// the current frame buffer, starting with the scan line indicated by
/// [`current_scan_line()`](DeepScanLineOutputPart::current_scan_line) and stores the data in the output file, and
/// progressing in the direction indicated by `header().line_order()`.
///
/// To produce a complete and correct file, exactly m scan lines must
/// be written, where m is equal to
/// `header().data_window().max.y - header().data_window().min.y + 1`.
///
/// # Errors
/// * [`Error::Io`] - If an I/O error occurs while writing the image data
/// * [`Error::InvalidArgument`] - If `current_scan_line() + num_scan_lines`
/// is outside the data window.
/// * [`Error::Base`] - If any other error occurs.
///
/// # Safety
/// This method is wildly unsafe as on the C++ side it's reading from
/// pointers offset from the base pointers supplied by the
/// [`DeepSlice`](crate::deep::deep_frame_buffer::DeepSlice) in
/// the [`DeepFrameBuffer`].
///
pub unsafe fn write_pixels(&mut self, num_scan_lines: i32) -> Result<()> {
sys::Imf_DeepScanLineOutputPart_writePixels(
&mut self.inner,
num_scan_lines,
)
.into_result()?;
Ok(())
}
/// Access to the current scan line:
///
/// Returns the y coordinate of the first scan line
/// that will be read from the current frame buffer during the next
/// call to [`write_pixels()`](DeepScanLineOutputPart::write_pixels).
///
/// If `line_order() == LineOrder::IncreasingY`:
///
/// The current scan line before the first call to [`write_pixels()`](DeepScanLineOutputPart::write_pixels)
/// is header().data_window().min.y. After writing each scan line,
/// the current scan line is incremented by 1.
///
/// If `line_order() == LineOrder::DecreasingY`:
///
/// The current scan line before the first call to
/// [`write_pixels()`](DeepScanLineOutputPart::write_pixels)
/// is header().data_window().max.y. After writing each scan line,
/// the current scan line is decremented by 1.
///
pub fn current_scan_line(&self) -> i32 {
let mut v = 0;
unsafe {
sys::Imf_DeepScanLineOutputPart_currentScanLine(
&self.inner,
&mut v,
);
}
v
}
/// Shortcut to copy all pixels from a [`DeepScanLineInputFile`] into this file,
/// without uncompressing and then recompressing the pixel data.
///
/// This file's header must be compatible with the [`DeepScanLineInputFile`]'s
/// header: The two header's "dataWindow", "compression",
/// "lineOrder" and "channels" attributes must be the same.
///
/// # Errors
/// * [`Error::InvalidArgument`] - If the headers do not match
/// * [`Error::LogicError`] - If scan lines have already been written to this file.
///
pub fn copy_pixels_from_file(
&mut self,
file: &DeepScanLineInputFile,
) -> Result<()> {
unsafe {
sys::Imf_DeepScanLineOutputPart_copyPixels_from_file(
&mut self.inner,
file.0,
)
.into_result()?;
}
Ok(())
}
/// Shortcut to copy all pixels from an [`DeepScanLineInputPart`] into this file,
/// without uncompressing and then recompressing the pixel data.
///
/// This file's header must be compatible with the [`DeepScanLineInputPart`]'s
/// header: The two header's "dataWindow", "compression",
/// "lineOrder" and "channels" attributes must be the same.
///
/// # Errors
/// * [`Error::InvalidArgument`] - If the headers do not match
/// * [`Error::LogicError`] - If scan lines have already been written to this file.
///
pub fn copy_pixels_from_part(
&mut self,
file: &mut DeepScanLineInputPart,
) -> Result<()> {
unsafe {
sys::Imf_DeepScanLineOutputPart_copyPixels_from_part(
&mut self.inner,
&mut file.inner,
)
.into_result()?;
}
Ok(())
}
/// Updating the preview image:
///
/// Supplies a new set of pixels for the
/// preview image attribute in the file's header.
///
/// This is necessary because images are
/// often stored in a file incrementally, a few scan lines at a
/// time, while the image is being generated. Since the preview
/// image is an attribute in the file's header, it gets stored in
/// the file as soon as the file is opened, but we may not know
/// what the preview image should look like until we have written
/// the last scan line of the main image.
///
/// # Errors
/// * [`Error::LogicError`] - If the header does not contain a preview image
/// * [`Error::Base`] - If any other error occurs
///
pub fn update_preview_image(
&mut self,
new_pixels: &[PreviewRgba],
) -> Result<()> {
unsafe {
sys::Imf_DeepScanLineOutputPart_updatePreviewImage(
&mut self.inner,
new_pixels.as_ptr() as *const sys::Imf_PreviewRgba_t,
)
.into_result()?;
}
Ok(())
}
}