1 files changed, 119 insertions, 0 deletions
diff --git a/vendor/exr/benches/pixel_format_conversion.rs b/vendor/exr/benches/pixel_format_conversion.rs
new file mode 100644
index 0000000..3d1ba93
--- /dev/null
+++ b/vendor/exr/benches/pixel_format_conversion.rs
@@ -0,0 +1,119 @@
+#[macro_use]
+extern crate bencher;
+
+extern crate exr;
+use exr::prelude::*;
+
+use bencher::Bencher;
+use std::fs;
+use std::io::Cursor;
+use exr::image::pixel_vec::PixelVec;
+use exr::io::Data;
+use exr::block::samples::FromNativeSample;
+
+const F32_ZIPS_PATH: &'static str = "tests/images/valid/custom/crowskull/crow_zips.exr";
+const F32_UNCOMPRESSED_PATH: &'static str = "tests/images/valid/custom/crowskull/crow_uncompressed.exr";
+const F16_UNCOMPRESSED_PATH: &'static str = "tests/images/valid/custom/crowskull/crow_uncompressed_half.exr";
+const F16_ZIP_PATH: &'static str = "tests/images/valid/custom/crowskull/crow_zip_half.exr";
+
+/// Read an image from an in-memory buffer into its native f32 format
+fn read_f32_as_f32_uncompressed_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f32>(bench, F32_UNCOMPRESSED_PATH, false);
+}
+
+/// Read image and convert the samples to u32 (from native f32)
+fn read_f32_as_u32_uncompressed_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<u32>(bench, F32_UNCOMPRESSED_PATH, false);
+}
+
+/// f16 is not natively supported by CPUs, which introduces unique performance pitfalls
+fn read_f32_as_f16_uncompressed_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f16>(bench, F32_UNCOMPRESSED_PATH, false);
+}
+
+fn read_f16_as_f16_uncompressed_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f16>(bench, F16_UNCOMPRESSED_PATH, false);
+}
+
+fn read_f16_as_f32_uncompressed_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f32>(bench, F16_UNCOMPRESSED_PATH, false);
+}
+
+fn read_f16_as_u32_uncompressed_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<u32>(bench, F16_UNCOMPRESSED_PATH, false);
+}
+
+
+fn read_f32_as_f16_zips_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f16>(bench, F32_ZIPS_PATH, false);
+}
+
+fn read_f16_as_f32_zip_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f32>(bench, F16_ZIP_PATH, false);
+}
+
+fn read_f32_as_f16_zips_nthreads(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f16>(bench, F32_ZIPS_PATH, true);
+}
+
+fn read_f16_as_f32_zip_nthreads(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f32>(bench, F16_ZIP_PATH, true);
+}
+
+fn read_f32_as_f32_zips_nthreads(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f32>(bench, F32_ZIPS_PATH, true);
+}
+
+fn read_f16_as_f16_zip_nthreads(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f16>(bench, F16_ZIP_PATH, true);
+}
+
+fn read_f32_as_f32_zips_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f32>(bench, F32_ZIPS_PATH, false);
+}
+
+fn read_f16_as_f16_zip_1thread(bench: &mut Bencher) {
+    bench_read_image_rgba_as::<f16>(bench, F16_ZIP_PATH, false);
+}
+
+fn bench_read_image_rgba_as<T>(bench: &mut Bencher, path: &str, parallel: bool) {
+    let mut file = fs::read(path).unwrap();
+    bencher::black_box(&mut file);
+
+    bench.iter(||{
+        let image = read_file_from_memory_as::<f16>(file.as_slice(), parallel);
+        bencher::black_box(image);
+    })
+}
+
+fn read_file_from_memory_as<T>(file: &[u8], parallel: bool) -> RgbaImage<PixelVec<(T, T, T, T)>>
+    where T: FromNativeSample
+{
+    let read = exr::prelude::read()
+        .no_deep_data().largest_resolution_level()
+        .rgba_channels(PixelVec::<(T, T, T, T)>::constructor, PixelVec::set_pixel)
+        .first_valid_layer().all_attributes();
+
+    let read = if parallel { read } else { read.non_parallel() };
+    read.from_buffered(Cursor::new(file)).unwrap()
+}
+
+benchmark_group!(pixel_format_conversion,
+    read_f32_as_f32_uncompressed_1thread,
+    read_f32_as_u32_uncompressed_1thread,
+    read_f32_as_f16_uncompressed_1thread,
+    read_f32_as_f16_zips_1thread,
+    read_f32_as_f16_zips_nthreads,
+    read_f32_as_f32_zips_nthreads,
+    read_f32_as_f32_zips_1thread,
+
+    read_f16_as_f16_uncompressed_1thread,
+    read_f16_as_u32_uncompressed_1thread,
+    read_f16_as_f32_uncompressed_1thread,
+    read_f16_as_f32_zip_1thread,
+    read_f16_as_f32_zip_nthreads,
+    read_f16_as_f16_zip_nthreads,
+    read_f16_as_f16_zip_1thread,
+);
+
+benchmark_main!(pixel_format_conversion);
+\ No newline at end of file