diff --git a/crates/zune-imageprocs/src/resize.rs b/crates/zune-imageprocs/src/resize.rs index 5172f3cd..07aa0193 100644 --- a/crates/zune-imageprocs/src/resize.rs +++ b/crates/zune-imageprocs/src/resize.rs @@ -17,6 +17,14 @@ use zune_image::traits::OperationsTrait; use crate::traits::NumOps; +mod bicubic; +mod bilinear; + +#[derive(Copy, Clone, Debug)] +pub enum ResizeMethod { + Bilinear //Bicubic +} + /// Resize an image to a new width and height /// using the resize method specified #[derive(Copy, Clone)] @@ -48,80 +56,155 @@ impl OperationsTrait for Resize { "Resize" } + #[allow(clippy::too_many_lines)] fn execute_impl(&self, image: &mut Image) -> Result<(), ImageErrors> { let (old_w, old_h) = image.dimensions(); let depth = image.depth().bit_type(); let new_length = self.new_width * self.new_height * image.depth().size_of(); - match depth { - BitType::U8 => { + #[cfg(feature = "threads")] + { + std::thread::scope(|f| { + let mut errors = vec![]; + for old_channel in image.channels_mut(false) { - let mut new_channel = Channel::new_with_bit_type(new_length, depth); + let result = f.spawn(|| { + let mut new_channel = Channel::new_with_bit_type(new_length, depth); + match depth { + BitType::U8 => resize::( + old_channel.reinterpret_as()?, + new_channel.reinterpret_as_mut()?, + self.method, + old_w, + old_h, + self.new_width, + self.new_height + ), + BitType::U16 => resize::( + old_channel.reinterpret_as()?, + new_channel.reinterpret_as_mut()?, + self.method, + old_w, + old_h, + self.new_width, + self.new_height + ), - resize::( - old_channel.reinterpret_as().unwrap(), - new_channel.reinterpret_as_mut().unwrap(), - self.method, - old_w, - old_h, - self.new_width, - self.new_height - ); - *old_channel = new_channel; + BitType::F32 => { + resize::( + old_channel.reinterpret_as()?, + new_channel.reinterpret_as_mut()?, + self.method, + old_w, + old_h, + self.new_width, + self.new_height + ); + } + d => return Err(ImageErrors::ImageOperationNotImplemented("resize", d)) + } + *old_channel = new_channel; + Ok(()) + }); + errors.push(result); } - } - BitType::U16 => { - for old_channel in image.channels_mut(true) { - let mut new_channel = Channel::new_with_bit_type(new_length, depth); + errors + .into_iter() + .map(|x| x.join().unwrap()) + .collect::, ImageErrors>>() + })?; + } - resize::( - old_channel.reinterpret_as().unwrap(), - new_channel.reinterpret_as_mut().unwrap(), + #[cfg(not(feature = "threads"))] + { + for old_channel in image.channels_mut(false) { + let mut new_channel = Channel::new_with_bit_type(new_length, depth); + match depth { + BitType::U8 => resize::( + old_channel.reinterpret_as()?, + new_channel.reinterpret_as_mut()?, self.method, old_w, old_h, self.new_width, self.new_height - ); - *old_channel = new_channel; - } - } - BitType::F32 => { - for old_channel in image.channels_mut(true) { - let mut new_channel = Channel::new_with_bit_type(new_length, depth); - - resize::( - old_channel.reinterpret_as().unwrap(), - new_channel.reinterpret_as_mut().unwrap(), + ), + BitType::U16 => resize::( + old_channel.reinterpret_as()?, + new_channel.reinterpret_as_mut()?, self.method, old_w, old_h, self.new_width, self.new_height - ); - *old_channel = new_channel; + ), + + BitType::F32 => { + resize::( + old_channel.reinterpret_as()?, + new_channel.reinterpret_as_mut()?, + self.method, + old_w, + old_h, + self.new_width, + self.new_height + ); + } + d => return Err(ImageErrors::ImageOperationNotImplemented("resize", d)) } + *old_channel = new_channel; } - d => return Err(ImageErrors::ImageOperationNotImplemented(self.name(), d)) } - image.set_dimensions(self.new_width, self.new_height); Ok(()) } fn supported_types(&self) -> &'static [BitType] { - &[BitType::U8, BitType::U16] + &[BitType::U8, BitType::U16, BitType::F32] } } -mod bilinear; -#[derive(Copy, Clone, Debug)] -pub enum ResizeMethod { - Bilinear +/// Return the image resize dimensions that would not cause a distortion +/// taking into consideration the smaller dimension +#[must_use] +#[allow( + clippy::cast_precision_loss, + clippy::cast_possible_truncation, + clippy::cast_sign_loss +)] +pub fn ratio_dimensions_smaller( + old_w: usize, old_h: usize, new_w: usize, new_h: usize +) -> (usize, usize) { + let ratio_w = old_w as f64 / new_w as f64; + let ratio_h = old_h as f64 / new_h as f64; + let percent = if ratio_h < ratio_w { ratio_w } else { ratio_h }; + + let t = (old_w as f64 / percent) as usize; + let u = (old_h as f64 / percent) as usize; + (t, u) } -/// Resize an image to new dimensions +/// Return the image resize dimensions that would not cause a distortion +/// taking into consideration the larger dimension +#[must_use] +#[allow( + clippy::cast_precision_loss, + clippy::cast_possible_truncation, + clippy::cast_sign_loss +)] +pub fn ratio_dimensions_larger( + old_w: usize, old_h: usize, new_w: usize, new_h: usize +) -> (usize, usize) { + let ratio_w = old_w as f64 / new_w as f64; + let ratio_h = old_h as f64 / new_h as f64; + let percent = if ratio_h < ratio_w { ratio_w } else { ratio_h }; + + let t = (old_w as f64 / percent) as usize; + let u = (old_h as f64 / percent) as usize; + (t, u) +} +/// Resize an image **channel** to new dimensions /// /// # Arguments /// - in_image: A contiguous slice of a single channel of an image @@ -139,13 +222,17 @@ pub fn resize( out_width: usize, out_height: usize ) where T: Copy + NumOps, - f64: std::convert::From + f32: std::convert::From { match method { ResizeMethod::Bilinear => { bilinear::bilinear_impl( in_image, out_image, in_width, in_height, out_width, out_height ); - } + } // ResizeMethod::Bicubic => { + // bicubic::resize_image_bicubic( + // in_image, out_image, in_width, in_height, out_width, out_height + // ); + // } } } diff --git a/crates/zune-imageprocs/src/resize/bicubic.rs b/crates/zune-imageprocs/src/resize/bicubic.rs new file mode 100644 index 00000000..af8ffc76 --- /dev/null +++ b/crates/zune-imageprocs/src/resize/bicubic.rs @@ -0,0 +1,69 @@ +#![allow(dead_code)] + +use crate::traits::NumOps; +pub fn resize_image_bicubic( + pixels: &[T], output: &mut [T], width: usize, height: usize, new_width: usize, + new_height: usize +) where + T: Copy + NumOps, + f32: std::convert::From +{ + // Filter coefficients for bicubic interpolation with Mitchell-Netravali kernel + #[rustfmt::skip] + let filter_coefficients = [ + -0.772, 0.270, -0.024, 0.006, + 0.826, -0.688, 0.491, -0.090, + -0.254, 0.870, 0.647, -0.166, + 0.064, -0.703, 0.728, 0.319 + ]; + + for y in 0..new_height { + for x in 0..new_width { + let new_x = x as f32 / new_width as f32 * width as f32; + let new_y = y as f32 / new_height as f32 * height as f32; + + let x0 = (new_x - 1.0).floor() as usize; + let x1 = x0 + 1; + let x2 = x1 + 1; + let x3 = x2 + 1; + + let y0 = (new_y - 1.0).floor() as usize; + let y1 = y0 + 1; + let y2 = y1 + 1; + let y3 = y2 + 1; + + // Clamp pixel indices to image boundaries + let x0 = x0.min(width - 1); + let x3 = x3.min(width - 1); + let y3 = y3.min(height - 1); + + // Calculate cubic coefficients + let mut a_coeffs = [0.0; 4]; + for i in 0..4 { + a_coeffs[i] = + calculate_cubic_coefficient(new_x - x0 as f32, filter_coefficients[i * 4]); + } + + // Interpolate pixel values + let mut a = 0.0; + for i in 0..4 { + for j in 0..4 { + let offset = (y3 - i) * width + (x3 - j); + a += f32::from(pixels[offset]) * a_coeffs[i] * a_coeffs[j]; + } + } + + output[y * new_width + x] = T::from_f32(a); + } + } +} + +fn calculate_cubic_coefficient(x: f32, a: f32) -> f32 { + return if x < 1.0 { + a * x * x * x + (a + 2.0) * x * x + (a + 1.0) * x + } else if x < 2.0 { + -a * x * x * x + (5.0 * a + 2.0) * x * x - (8.0 * a + 4.0) * x + (4.0 * a + 6.0) + } else { + 0.0 + }; +} diff --git a/crates/zune-imageprocs/src/resize/bilinear.rs b/crates/zune-imageprocs/src/resize/bilinear.rs index ad036f68..3b455c83 100644 --- a/crates/zune-imageprocs/src/resize/bilinear.rs +++ b/crates/zune-imageprocs/src/resize/bilinear.rs @@ -1,5 +1,7 @@ use crate::traits::NumOps; +/// Bilinear interpolation of a single channel, this interpolates a single channel, but not an image +/// /// #[allow( clippy::cast_precision_loss, @@ -7,12 +9,53 @@ use crate::traits::NumOps; clippy::cast_possible_truncation )] pub fn bilinear_impl( - _in_image: &[T], _out_image: &mut [T], _in_width: usize, _in_height: usize, _out_width: usize, - _out_height: usize + in_channel: &[T], out_channel: &mut [T], in_width: usize, in_height: usize, out_width: usize, + out_height: usize ) where T: Copy + NumOps, - f64: std::convert::From + f32: std::convert::From { - // stump - return; + let w_ratio = 1.0 / out_width as f32 * in_width as f32; + let h_ratio = 1.0 / out_height as f32 * in_height as f32; + + let smaller_image_to_larger = w_ratio < 1.0 && h_ratio < 1.0; + + for y in 0..out_height { + for x in 0..out_width { + let new_x = x as f32 * w_ratio; + let new_y = y as f32 * h_ratio; + // floor and truncate are slow due to handling overflow and such, so avoid them here + let mut x0 = new_x.floor() as usize; + let mut y0 = new_y.floor() as usize; + let mut x1 = x0 + 1; + let mut y1 = y0 + 1; + + // PS: I'm not sure about the impact, but it cuts down on code executed + // the branch is deterministic hence the CPU should have an easy time predicting it + if smaller_image_to_larger { + // in case of result image being greater than source image, it may happen that + // the above go beyond picture dimensions, so clamp them here if they do + // clamp to image width and height + y1 = y1.min(in_height - 1); + y0 = y0.min(in_height - 1); + x1 = x1.min(in_width - 1); + x0 = x0.min(in_width - 1); + } + + let a = new_x - x0 as f32; + let b = new_y - y0 as f32; + + let p00 = f32::from(in_channel[y0 * in_width + x0]); + let p10 = f32::from(in_channel[y0 * in_width + x1]); + let p01 = f32::from(in_channel[y1 * in_width + x0]); + let p11 = f32::from(in_channel[y1 * in_width + x1]); + + let interpolated_pixel = p00 * (1.0 - a) * (1.0 - b) + + p10 * a * (1.0 - b) + + p01 * (1.0 - a) * b + + p11 * a * b; + + out_channel[y * out_width + x] = T::from_f32(interpolated_pixel); + } + } }