external/fast_image_resize
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Added some comments for example code

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This commit is contained in:
Kirill Kuzminykh
2021-07-04 16:45:44 +03:00
parent 83cbef093b
commit 6214456ddd
2 changed files with 35 additions and 21 deletions
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README.md
+28 -21
View File
@@ -97,37 +97,44 @@ use fast_image_resize::{
};
fn resize_lanczos3(src_pixels: &[u8], width: NonZeroU32, height: NonZeroU32) -> Vec<u8> {
let src_image = ImageData::new(width, height, src_pixels, PixelType::U8x4).unwrap();
let src_view = src_image.src_view();
let dst_width = NonZeroU32::new(1024).unwrap();
let dst_height = NonZeroU32::new(768).unwrap();
let mut dst_image = ImageData::new_owned(dst_width, dst_height, src_image.pixel_type());
let mut dst_view = dst_image.dst_view();
// Create wrapper for raw data of source image
let src_image = ImageData::new(width, height, src_pixels, PixelType::U8x4).unwrap();
// Get immutable view of image data
let src_view = src_image.src_view();
let mut resizer = Resizer::new(ResizeAlg::Convolution(FilterType::Lanczos3));
resizer.resize(&src_view, &mut dst_view);
let dst_width = NonZeroU32::new(1024).unwrap();
let dst_height = NonZeroU32::new(768).unwrap();
// Create wrapper that own data of destination image
let mut dst_image = ImageData::new_owned(dst_width, dst_height, src_image.pixel_type());
// Get mutable view of destination image data
let mut dst_view = dst_image.dst_view();
dst_image.get_buffer().to_owned()
// Create Resizer instance and resize source image into buffer of destination image
let mut resizer = Resizer::new(ResizeAlg::Convolution(FilterType::Lanczos3));
resizer.resize(&src_view, &mut dst_view);
// Return destination buffer as Vec<u8>
dst_image.get_buffer().to_owned()
}
fn crop_and_resize_image(mut src_view: SrcImageView) -> ImageData<Vec<u8>> {
src_view
.set_crop_box(CropBox {
// Set crop-box for view of source image
src_view
.set_crop_box(CropBox {
left: 10,
top: 10,
width: NonZeroU32::new(100).unwrap(),
height: NonZeroU32::new(200).unwrap(),
})
.unwrap();
let dst_width = NonZeroU32::new(1024).unwrap();
let dst_height = NonZeroU32::new(768).unwrap();
let mut dst_image = ImageData::new_owned(dst_width, dst_height, src_view.pixel_type());
let mut dst_view = dst_image.dst_view();
})
.unwrap();
let dst_width = NonZeroU32::new(1024).unwrap();
let dst_height = NonZeroU32::new(768).unwrap();
let mut dst_image = ImageData::new_owned(dst_width, dst_height, src_view.pixel_type());
let mut dst_view = dst_image.dst_view();
let mut resizer = Resizer::new(ResizeAlg::Convolution(FilterType::Lanczos3));
resizer.resize(&src_view, &mut dst_view);
let mut resizer = Resizer::new(ResizeAlg::Convolution(FilterType::Lanczos3));
resizer.resize(&src_view, &mut dst_view);
dst_image
dst_image
}
```
tests/readme_examples.rs
+7
View File
@@ -5,21 +5,28 @@ use fast_image_resize::{
};
fn resize_lanczos3(src_pixels: &[u8], width: NonZeroU32, height: NonZeroU32) -> Vec<u8> {
// Create wrapper for raw data of source image
let src_image = ImageData::new(width, height, src_pixels, PixelType::U8x4).unwrap();
// Get immutable view of image data
let src_view = src_image.src_view();
let dst_width = NonZeroU32::new(1024).unwrap();
let dst_height = NonZeroU32::new(768).unwrap();
// Create wrapper that own data of destination image
let mut dst_image = ImageData::new_owned(dst_width, dst_height, src_image.pixel_type());
// Get mutable view of destination image data
let mut dst_view = dst_image.dst_view();
// Create Resizer instance and resize source image into buffer of destination image
let mut resizer = Resizer::new(ResizeAlg::Convolution(FilterType::Lanczos3));
resizer.resize(&src_view, &mut dst_view);
// Return destination buffer as Vec<u8>
dst_image.get_buffer().to_owned()
}
fn crop_and_resize_image(mut src_view: SrcImageView) -> ImageData<Vec<u8>> {
// Set crop-box for view of source image
src_view
.set_crop_box(CropBox {
left: 10,