[librsvg: 1/9] Add a benchmark for pixbuf_from_surface

[Federico Mena Quintero <federico src gnome org>]

commit 8658831fb7a900620accc505f38090616e9a886d
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu May 28 14:02:21 2020 -0500

    Add a benchmark for pixbuf_from_surface

 Cargo.lock                             |  1 +
 librsvg/Cargo.toml                     |  9 +++++-
 librsvg/benches/pixbuf_from_surface.rs | 54 ++++++++++++++++++++++++++++++++++
 librsvg/lib.rs                         |  2 +-
 4 files changed, 64 insertions(+), 2 deletions(-)
---
diff --git a/Cargo.lock b/Cargo.lock
index 507bb6ed..3cbba348 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -695,6 +695,7 @@ dependencies = [
  "cairo-rs 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cairo-sys-rs 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "cast 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "criterion 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "gdk-pixbuf 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "gdk-pixbuf-sys 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "gio 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/librsvg/Cargo.toml b/librsvg/Cargo.toml
index 42a0936d..669ec866 100644
--- a/librsvg/Cargo.toml
+++ b/librsvg/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 [lib]
 name = "rsvg_c_api"
 path = "lib.rs"
-crate-type = [ "staticlib" ]
+crate-type = [ "staticlib", "rlib" ]
 
 [dependencies]
 bitflags = "1.0"
@@ -25,3 +25,10 @@ gobject-sys = "0.9.0"
 libc = "0.2"
 rsvg_internals = { path = "../rsvg_internals" }
 url = "2"
+
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "pixbuf_from_surface"
+harness = false
diff --git a/librsvg/benches/pixbuf_from_surface.rs b/librsvg/benches/pixbuf_from_surface.rs
new file mode 100644
index 00000000..7e2cf26a
--- /dev/null
+++ b/librsvg/benches/pixbuf_from_surface.rs
@@ -0,0 +1,54 @@
+use std::time::Duration;
+
+use criterion::{criterion_group, criterion_main, Criterion};
+
+use rsvg_c_api::pixbuf_utils::pixbuf_from_surface;
+use rsvg_internals::rect::IRect;
+use rsvg_internals::surface_utils::{
+    shared_surface::{ExclusiveImageSurface, SurfaceType},
+    ImageSurfaceDataExt, Pixel,
+};
+
+const BOUNDS: IRect = IRect {
+    x0: 0,
+    y0: 0,
+    x1: 256,
+    y1: 256,
+};
+
+fn bench_pixbuf_from_surface(c: &mut Criterion) {
+    c.bench_function("pixbuf_from_surface", |b| {
+        let mut surface =
+            ExclusiveImageSurface::new(256, 256, SurfaceType::SRgb).unwrap();
+
+        // Fill the surface with interesting data
+        surface.modify(&mut |data, stride| {
+            for y in BOUNDS.y_range() {
+                for x in BOUNDS.x_range() {
+                    let pixel = Pixel {
+                        r: x as u8,
+                        g: y as u8,
+                        b: x.max(y) as u8,
+                        a: 255,
+                    };
+
+                    data.set_pixel(stride, pixel, x as u32, y as u32);
+                }
+            }
+        });
+
+        let surface = surface.share().unwrap();
+
+        b.iter(|| {
+            let _pixbuf = pixbuf_from_surface(&surface).unwrap();
+        })
+    });
+}
+    
+
+criterion_group!(
+    name = benches;
+    config = Criterion::default().measurement_time(Duration::from_secs(10));
+    targets = bench_pixbuf_from_surface,
+);
+criterion_main!(benches);
diff --git a/librsvg/lib.rs b/librsvg/lib.rs
index a8029640..742bf2a0 100644
--- a/librsvg/lib.rs
+++ b/librsvg/lib.rs
@@ -53,4 +53,4 @@ mod messages;
 mod c_api;
 mod color_utils;
 mod dpi;
-mod pixbuf_utils;
+pub mod pixbuf_utils;