1 #include <stdio.h>
2 #include <assert.h>
3 #include <benchmark/benchmark.h>
4 #include "benchmark_png_shared.h"
5
6 #define IMWIDTH 1024
7 #define IMHEIGHT 1024
8
9 class png_encode: public benchmark::Fixture {
10 private:
11 png_dat outpng;
12
13 /* Backing this on the heap is a more realistic benchmark */
14 uint8_t *input_img_buf = NULL;
15
16 public:
17 /* Let's make the vanilla version have something extremely compressible */
init_img(png_bytep img_bytes,size_t width,size_t height)18 virtual void init_img(png_bytep img_bytes, size_t width, size_t height) {
19 init_compressible(img_bytes, width * height);
20 }
21
SetUp(const::benchmark::State & state)22 void SetUp(const ::benchmark::State& state) {
23 input_img_buf = (uint8_t*)malloc(IMWIDTH * IMHEIGHT * 3);
24 outpng.buf = (uint8_t*)malloc(IMWIDTH * IMHEIGHT * 3);
25 /* Using malloc rather than zng_alloc so that we can call realloc.
26 * IMWIDTH * IMHEIGHT is likely to be more than enough bytes, though,
27 * given that a simple run length encoding already pretty much can
28 * reduce to this */
29 outpng.len = 0;
30 outpng.buf_rem = IMWIDTH * IMHEIGHT * 3;
31 assert(input_img_buf != NULL);
32 assert(outpng.buf != NULL);
33 init_img(input_img_buf, IMWIDTH, IMHEIGHT);
34 }
35
36 /* State in this circumstance will convey the compression level */
Bench(benchmark::State & state)37 void Bench(benchmark::State &state) {
38 for (auto _ : state) {
39 encode_png((png_bytep)input_img_buf, &outpng, state.range(0), IMWIDTH, IMHEIGHT);
40 outpng.buf_rem = outpng.len;
41 outpng.len = 0;
42 }
43 }
44
TearDown(const::benchmark::State & state)45 void TearDown(const ::benchmark::State &state) {
46 free(input_img_buf);
47 free(outpng.buf);
48 }
49 };
50
BENCHMARK_DEFINE_F(png_encode,encode_compressible)51 BENCHMARK_DEFINE_F(png_encode, encode_compressible)(benchmark::State &state) {
52 Bench(state);
53 }
54 BENCHMARK_REGISTER_F(png_encode, encode_compressible)->DenseRange(0, 9, 1)->Unit(benchmark::kMicrosecond);
55