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encoder.rs
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encoder.rs
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use std::collections::HashMap;
use std::ffi::CString;
use libheif_sys as lh;
use crate::utils::cstr_to_str;
use crate::{
EncoderParameterType, EncoderParameterValue, EncoderQuality, HeifError, HeifErrorCode,
HeifErrorSubCode, Result,
};
pub type EncoderParametersTypes = HashMap<String, EncoderParameterType>;
fn parameters_types(c_encoder: *mut lh::heif_encoder) -> Result<EncoderParametersTypes> {
let mut res = EncoderParametersTypes::new();
unsafe {
let mut param_pointers = lh::heif_encoder_list_parameters(c_encoder);
if !param_pointers.is_null() {
while let Some(raw_param) = (*param_pointers).as_ref() {
let c_param_type = lh::heif_encoder_parameter_get_type(raw_param);
let param_type: EncoderParameterType;
match EncoderParameterType::n(c_param_type) {
Some(res) => {
param_type = res;
}
None => {
return Err(HeifError {
code: HeifErrorCode::EncoderPluginError,
sub_code: HeifErrorSubCode::UnsupportedParameter,
message: format!("{} is unknown type of parameter", c_param_type),
});
}
}
let c_param_name = lh::heif_encoder_parameter_get_name(raw_param);
let name = cstr_to_str(c_param_name).unwrap_or("").to_string();
res.insert(name, param_type);
param_pointers = param_pointers.offset(1);
}
}
}
Ok(res)
}
pub struct Encoder {
pub(crate) inner: *mut lh::heif_encoder,
pub(crate) parameters_types: EncoderParametersTypes,
}
impl Encoder {
pub(crate) fn new(c_encoder: *mut lh::heif_encoder) -> Result<Encoder> {
Ok(Encoder {
inner: c_encoder,
parameters_types: parameters_types(c_encoder)?,
})
}
pub fn name(&self) -> &str {
let res = unsafe { lh::heif_encoder_get_name(self.inner) };
cstr_to_str(res).unwrap_or("")
}
pub fn set_quality(&mut self, quality: EncoderQuality) -> Result<()> {
let err;
match quality {
EncoderQuality::LossLess => {
err = unsafe { lh::heif_encoder_set_lossless(self.inner, 1) };
}
EncoderQuality::Lossy(value) => {
unsafe {
let middle_err = lh::heif_encoder_set_lossless(self.inner, 0);
HeifError::from_heif_error(middle_err)?;
err = lh::heif_encoder_set_lossy_quality(self.inner, i32::from(value))
};
}
}
HeifError::from_heif_error(err)
}
fn parameter_value(
&self,
name: &str,
parameter_type: EncoderParameterType,
) -> Result<EncoderParameterValue> {
let c_param_name = CString::new(name).unwrap();
let param_value;
match parameter_type {
EncoderParameterType::Int => {
let mut value = 0;
let err = unsafe {
lh::heif_encoder_get_parameter_integer(
self.inner,
c_param_name.as_ptr(),
&mut value as _,
)
};
HeifError::from_heif_error(err)?;
param_value = EncoderParameterValue::Int(value);
}
EncoderParameterType::Bool => {
let mut value = 0;
let err = unsafe {
lh::heif_encoder_get_parameter_boolean(
self.inner,
c_param_name.as_ptr(),
&mut value as _,
)
};
HeifError::from_heif_error(err)?;
param_value = EncoderParameterValue::Bool(value > 0);
}
EncoderParameterType::String => {
let value: Vec<u8> = vec![0; 51];
let err = unsafe {
lh::heif_encoder_get_parameter_string(
self.inner,
c_param_name.as_ptr(),
value.as_ptr() as _,
50,
)
};
HeifError::from_heif_error(err)?;
param_value = EncoderParameterValue::String(
cstr_to_str(value.as_ptr() as _).unwrap_or("").to_string(),
);
}
};
Ok(param_value)
}
pub fn parameters_names(&self) -> Vec<String> {
self.parameters_types.keys().cloned().collect()
}
pub fn parameter(&self, name: &str) -> Result<Option<EncoderParameterValue>> {
match self.parameters_types.get(name) {
Some(param_type) => {
let value = self.parameter_value(name, *param_type)?;
Ok(Some(value))
}
None => Ok(None),
}
}
}
impl Drop for Encoder {
fn drop(&mut self) {
unsafe { lh::heif_encoder_release(self.inner) };
}
}
#[repr(C)]
#[derive(Debug, Copy, Clone)]
pub struct EncodingOptions {
pub version: u8,
pub save_alpha_channel: bool,
}
impl Default for EncodingOptions {
fn default() -> Self {
unsafe {
let heif_opt = lh::heif_encoding_options_alloc();
let res = EncodingOptions {
version: (*heif_opt).version,
save_alpha_channel: (*heif_opt).save_alpha_channel != 0,
};
lh::heif_encoding_options_free(heif_opt);
res
}
}
}
impl EncodingOptions {
pub(crate) fn heif_encoding_options(self) -> lh::heif_encoding_options {
lh::heif_encoding_options {
version: self.version,
save_alpha_channel: if self.save_alpha_channel { 1 } else { 0 },
}
}
}