| 1 | #define STB_IMAGE_IMPLEMENTATION |
| 2 | #define STB_IMAGE_WRITE_IMPLEMENTATION |
| 3 | #include "test_common.h" |
| 4 | #include "stb_image.h" |
| 5 | #include "stb_image_write.h" |
| 6 | #include <math.h> |
| 7 | #include <sys/time.h> |
| 8 | |
| 9 | uint8_t *load_image(const char *path, int *width, int *height, int *channels) { |
| 10 | return stbi_load(path, width, height, channels, 4); |
| 11 | } |
| 12 | |
| 13 | int save_image(const char *path, uint8_t *data, int width, int height, int channels) { |
| 14 | return stbi_write_png(path, width, height, channels, data, width * channels); |
| 15 | } |
| 16 | |
| 17 | uint8_t *downsample_image(uint8_t *src, int sw, int sh, int sc, int *dw, int *dh, float scale) { |
| 18 | if (!src || sw <= 0 || sh <= 0 || sc <= 0 || scale <= 0) { |
| 19 | if (dw) *dw = 0; |
| 20 | if (dh) *dh = 0; |
| 21 | return NULL; |
| 22 | } |
| 23 | |
| 24 | int tw = (int)(sw * scale); |
| 25 | int th = (int)(sh * scale); |
| 26 | |
| 27 | if (tw < 1) tw = 1; |
| 28 | if (th < 1) th = 1; |
| 29 | |
| 30 | uint8_t *dst = malloc(tw * th * sc); |
| 31 | if (!dst) return NULL; |
| 32 | |
| 33 | float inv_scale = 1.0f / scale; |
| 34 | for (int y = 0; y < th; y++) { |
| 35 | for (int x = 0; x < tw; x++) { |
| 36 | float sx = (x + 0.5f) * inv_scale; |
| 37 | float sy = (y + 0.5f) * inv_scale; |
| 38 | |
| 39 | int ix = (int)sx; |
| 40 | int iy = (int)sy; |
| 41 | |
| 42 | if (sw > 1) { |
| 43 | ix = (ix < sw - 2) ? ix : sw - 2; |
| 44 | } else { |
| 45 | ix = 0; |
| 46 | } |
| 47 | if (sh > 1) { |
| 48 | iy = (iy < sh - 2) ? iy : sh - 2; |
| 49 | } else { |
| 50 | iy = 0; |
| 51 | } |
| 52 | |
| 53 | if (ix < 0) ix = 0; |
| 54 | if (iy < 0) iy = 0; |
| 55 | |
| 56 | float fx = sx - ix; |
| 57 | float fy = sy - iy; |
| 58 | |
| 59 | if (sw == 1) fx = 0.0f; |
| 60 | if (sh == 1) fy = 0.0f; |
| 61 | |
| 62 | for (int c = 0; c < sc; c++) { |
| 63 | uint8_t p00 = src[(iy * sw + ix) * sc + c]; |
| 64 | uint8_t p01 = (sw > 1) ? src[(iy * sw + ix + 1) * sc + c] : p00; |
| 65 | uint8_t p10 = (sh > 1) ? src[((iy + 1) * sw + ix) * sc + c] : p00; |
| 66 | uint8_t p11 = (sw > 1 && sh > 1) ? src[((iy + 1) * sw + ix + 1) * sc + c] : p00; |
| 67 | |
| 68 | float interp = p00 * (1 - fx) * (1 - fy) + |
| 69 | p01 * fx * (1 - fy) + |
| 70 | p10 * (1 - fx) * fy + |
| 71 | p11 * fx * fy; |
| 72 | |
| 73 | dst[(y * tw + x) * sc + c] = (uint8_t)(interp + 0.5f); |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | *dw = tw; |
| 79 | *dh = th; |
| 80 | return dst; |
| 81 | } |
| 82 | |
| 83 | double get_time_ms(void) { |
| 84 | struct timeval tv; |
| 85 | gettimeofday(&tv, NULL); |
| 86 | return tv.tv_sec * 1000.0 + tv.tv_usec / 1000.0; |
| 87 | } |
| 88 | |
| 89 | double run_benchmark(double (*fn)(void), int iterations) { |
| 90 | double warmup = fn(); |
| 91 | (void)warmup; |
| 92 | |
| 93 | double total = 0.0; |
| 94 | for (int i = 0; i < iterations; i++) { |
| 95 | total += fn(); |
| 96 | } |
| 97 | return total / iterations; |
| 98 | } |
| 99 | |
| 100 | int compare_images(uint8_t *a, uint8_t *b, int w, int h, int ch, float threshold) { |
| 101 | int max_diff = 0; |
| 102 | for (int i = 0; i < w * h * ch; i++) { |
| 103 | int diff = abs((int)a[i] - (int)b[i]); |
| 104 | if (diff > max_diff) max_diff = diff; |
| 105 | if (diff > (int)(threshold * 255.0f)) { |
| 106 | return 0; |
| 107 | } |
| 108 | } |
| 109 | return 1; |
| 110 | } |
| 111 | |
| 112 | float compute_psnr(uint8_t *a, uint8_t *b, int w, int h, int ch) { |
| 113 | double mse = 0.0; |
| 114 | int total = w * h * ch; |
| 115 | |
| 116 | for (int i = 0; i < total; i++) { |
| 117 | double diff = (double)a[i] - (double)b[i]; |
| 118 | mse += diff * diff; |
| 119 | } |
| 120 | |
| 121 | mse /= total; |
| 122 | |
| 123 | if (mse < 1e-10) return 99.99f; |
| 124 | |
| 125 | return (float)(10.0 * log10(255.0 * 255.0 / mse)); |
| 126 | } |
| 127 | |
| 128 | uint8_t *create_gradient_image(int w, int h) { |
| 129 | uint8_t *img = malloc(w * h * 4); |
| 130 | if (!img) return NULL; |
| 131 | |
| 132 | for (int y = 0; y < h; y++) { |
| 133 | for (int x = 0; x < w; x++) { |
| 134 | int idx = (y * w + x) * 4; |
| 135 | img[idx + 0] = (uint8_t)((float)x / w * 255); |
| 136 | img[idx + 1] = (uint8_t)((float)y / h * 255); |
| 137 | img[idx + 2] = 128; |
| 138 | img[idx + 3] = 255; |
| 139 | } |
| 140 | } |
| 141 | return img; |
| 142 | } |
| 143 | |
| 144 | uint8_t *create_noise_image(int w, int h, unsigned int seed) { |
| 145 | uint8_t *img = malloc(w * h * 4); |
| 146 | if (!img) return NULL; |
| 147 | |
| 148 | srand(seed); |
| 149 | for (int i = 0; i < w * h * 4; i++) { |
| 150 | img[i] = (uint8_t)(rand() % 256); |
| 151 | } |
| 152 | return img; |
| 153 | } |
| 154 | |
| 155 | uint8_t *create_uniform_image(int w, int h, uint8_t r, uint8_t g, uint8_t b) { |
| 156 | uint8_t *img = malloc(w * h * 4); |
| 157 | if (!img) return NULL; |
| 158 | |
| 159 | for (int i = 0; i < w * h; i++) { |
| 160 | img[i * 4 + 0] = r; |
| 161 | img[i * 4 + 1] = g; |
| 162 | img[i * 4 + 2] = b; |
| 163 | img[i * 4 + 3] = 255; |
| 164 | } |
| 165 | return img; |
| 166 | } |
| 167 | |
| 168 | uint8_t *create_checkerboard(int w, int h, int check_size) { |
| 169 | uint8_t *img = malloc(w * h * 4); |
| 170 | if (!img) return NULL; |
| 171 | |
| 172 | for (int y = 0; y < h; y++) { |
| 173 | for (int x = 0; x < w; x++) { |
| 174 | int idx = (y * w + x) * 4; |
| 175 | int cx = x / check_size; |
| 176 | int cy = y / check_size; |
| 177 | if ((cx + cy) % 2 == 0) { |
| 178 | img[idx + 0] = 255; |
| 179 | img[idx + 1] = 255; |
| 180 | img[idx + 2] = 255; |
| 181 | } else { |
| 182 | img[idx + 0] = 0; |
| 183 | img[idx + 1] = 0; |
| 184 | img[idx + 2] = 0; |
| 185 | } |
| 186 | img[idx + 3] = 255; |
| 187 | } |
| 188 | } |
| 189 | return img; |
| 190 | } |