1 files changed, 54 insertions, 0 deletions
diff --git a/neozip/test/benchmarks/benchmark_png_encode.cc b/neozip/test/benchmarks/benchmark_png_encode.cc
new file mode 100644
index 0000000000..d5e25cbc9d
--- /dev/null
+++ b/neozip/test/benchmarks/benchmark_png_encode.cc
@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <assert.h>
+#include <benchmark/benchmark.h>
+#include "benchmark_png_shared.h"
+
+#define IMWIDTH 1024
+#define IMHEIGHT 1024
+
+class png_encode: public benchmark::Fixture {
+private:
+    png_dat outpng;
+
+    /* Backing this on the heap is a more realistic benchmark */
+    uint8_t *input_img_buf = NULL;
+
+public:
+    /* Let's make the vanilla version have something extremely compressible */
+    virtual void init_img(png_bytep img_bytes, size_t width, size_t height) {
+        init_compressible(img_bytes, width * height);
+    }
+
+    void SetUp(const ::benchmark::State&) {
+        input_img_buf = (uint8_t*)malloc(IMWIDTH * IMHEIGHT * 3);
+        outpng.buf = (uint8_t*)malloc(IMWIDTH * IMHEIGHT * 3);
+        /* Using malloc rather than zng_alloc so that we can call realloc.
+         * IMWIDTH * IMHEIGHT is likely to be more than enough bytes, though,
+         * given that a simple run length encoding already pretty much can
+         * reduce to this */
+        outpng.len = 0;
+        outpng.buf_rem = IMWIDTH * IMHEIGHT * 3;
+        assert(input_img_buf != NULL);
+        assert(outpng.buf != NULL);
+        init_img(input_img_buf, IMWIDTH, IMHEIGHT);
+    }
+
+    /* State in this circumstance will convey the compression level */
+    void Bench(benchmark::State &state) {
+        for (auto _ : state) {
+            encode_png((png_bytep)input_img_buf, &outpng, state.range(0), IMWIDTH, IMHEIGHT);
+            outpng.buf_rem = outpng.len;
+            outpng.len = 0;
+        }
+    }
+
+    void TearDown(const ::benchmark::State &) {
+        free(input_img_buf);
+        free(outpng.buf);
+    }
+};
+
+BENCHMARK_DEFINE_F(png_encode, encode_compressible)(benchmark::State &state) {
+    Bench(state);
+}
+BENCHMARK_REGISTER_F(png_encode, encode_compressible)->DenseRange(0, 9, 1)->Unit(benchmark::kMicrosecond);