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nothings-stb/tests/resample_test.cpp

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#include <malloc.h>
#if defined(_WIN32) && _MSC_VER > 1200
#define STBIR_ASSERT(x) \
if (!(x)) { \
__debugbreak(); \
} else
#else
#include <assert.h>
#define STBIR_ASSERT(x) assert(x)
#endif
#define STBIR_MALLOC stbir_malloc
#define STBIR_FREE stbir_free
class stbir_context {
public:
stbir_context()
{
size = 1000000;
memory = malloc(size);
}
~stbir_context()
{
free(memory);
}
size_t size;
void* memory;
} g_context;
void* stbir_malloc(size_t size, void* context)
{
if (!context)
return malloc(size);
stbir_context* real_context = (stbir_context*)context;
if (size > real_context->size)
return 0;
return real_context->memory;
}
void stbir_free(void* memory, void* context)
{
if (!context)
free(memory);
}
//#include <stdio.h>
void stbir_progress(float p)
{
//printf("%f\n", p);
STBIR_ASSERT(p >= 0 && p <= 1);
}
#define STBIR_PROGRESS_REPORT stbir_progress
#define STB_IMAGE_RESIZE_IMPLEMENTATION
#define STB_IMAGE_RESIZE_STATIC
#include "stb_image_resize.h"
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#ifdef _WIN32
#include <sys/timeb.h>
#endif
#include <direct.h>
#define MT_SIZE 624
static size_t g_aiMT[MT_SIZE];
static size_t g_iMTI = 0;
// Mersenne Twister implementation from Wikipedia.
// Avoiding use of the system rand() to be sure that our tests generate the same test data on any system.
void mtsrand(size_t iSeed)
{
g_aiMT[0] = iSeed;
for (size_t i = 1; i < MT_SIZE; i++)
{
size_t inner1 = g_aiMT[i - 1];
size_t inner2 = (g_aiMT[i - 1] >> 30);
size_t inner = inner1 ^ inner2;
g_aiMT[i] = (0x6c078965 * inner) + i;
}
g_iMTI = 0;
}
size_t mtrand()
{
if (g_iMTI == 0)
{
for (size_t i = 0; i < MT_SIZE; i++)
{
size_t y = (0x80000000 & (g_aiMT[i])) + (0x7fffffff & (g_aiMT[(i + 1) % MT_SIZE]));
g_aiMT[i] = g_aiMT[(i + 397) % MT_SIZE] ^ (y >> 1);
if ((y % 2) == 1)
g_aiMT[i] = g_aiMT[i] ^ 0x9908b0df;
}
}
size_t y = g_aiMT[g_iMTI];
y = y ^ (y >> 11);
y = y ^ ((y << 7) & (0x9d2c5680));
y = y ^ ((y << 15) & (0xefc60000));
y = y ^ (y >> 18);
g_iMTI = (g_iMTI + 1) % MT_SIZE;
return y;
}
inline float mtfrand()
{
const int ninenine = 999999;
return (float)(mtrand() % ninenine)/ninenine;
}
static void resizer(int argc, char **argv)
{
unsigned char* input_pixels;
unsigned char* output_pixels;
int w, h;
int n;
int out_w, out_h;
input_pixels = stbi_load(argv[1], &w, &h, &n, 0);
out_w = w*3;
out_h = h*3;
output_pixels = (unsigned char*) malloc(out_w*out_h*n);
//stbir_resize_uint8_srgb(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, n, -1,0);
stbir_resize_uint8(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, n);
stbi_write_png("output.png", out_w, out_h, n, output_pixels, 0);
exit(0);
}
static void performance(int argc, char **argv)
{
unsigned char* input_pixels;
unsigned char* output_pixels;
int w, h, count;
int n, i;
int out_w, out_h, srgb=1;
input_pixels = stbi_load(argv[1], &w, &h, &n, 0);
#if 0
out_w = w/4; out_h = h/4; count=100; // 1
#elif 0
out_w = w*2; out_h = h/4; count=20; // 2 // note this is structured pessimily, would be much faster to downsample vertically first
#elif 0
out_w = w/4; out_h = h*2; count=50; // 3
#elif 0
out_w = w*3; out_h = h*3; count=2; srgb=0; // 4
#else
out_w = w*3; out_h = h*3; count=2; // 5 // this is dominated by linear->sRGB conversion
#endif
output_pixels = (unsigned char*) malloc(out_w*out_h*n);
for (i=0; i < count; ++i)
if (srgb)
stbir_resize_uint8_srgb(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, n,-1,0);
else
stbir_resize(input_pixels, w, h, 0, output_pixels, out_w, out_h, 0, STBIR_TYPE_UINT8, n,-1, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_DEFAULT, STBIR_FILTER_DEFAULT, STBIR_COLORSPACE_LINEAR, NULL);
exit(0);
}
void test_suite(int argc, char **argv);
int main(int argc, char** argv)
{
//resizer(argc, argv);
//performance(argc, argv);
test_suite(argc, argv);
return 0;
}
void resize_image(const char* filename, float width_percent, float height_percent, stbir_filter filter, stbir_edge edge, stbir_colorspace colorspace, const char* output_filename)
{
int w, h, n;
unsigned char* input_data = stbi_load(filename, &w, &h, &n, 0);
if (!input_data)
{
printf("Input image could not be loaded\n");
return;
}
int out_w = (int)(w * width_percent);
int out_h = (int)(h * height_percent);
unsigned char* output_data = (unsigned char*)malloc(out_w * out_h * n);
stbir_resize(input_data, w, h, 0, output_data, out_w, out_h, 0, STBIR_TYPE_UINT8, n, STBIR_ALPHA_CHANNEL_NONE, 0, edge, edge, filter, filter, colorspace, &g_context);
stbi_image_free(input_data);
stbi_write_png(output_filename, out_w, out_h, n, output_data, 0);
free(output_data);
}
template <typename F, typename T>
void convert_image(const F* input, T* output, int length)
{
double f = (pow(2.0, 8.0 * sizeof(T)) - 1) / (pow(2.0, 8.0 * sizeof(F)) - 1);
for (int i = 0; i < length; i++)
output[i] = (T)(((double)input[i]) * f);
}
template <typename T>
void test_format(const char* file, float width_percent, float height_percent, stbir_datatype type, stbir_colorspace colorspace)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
T* T_data = (T*)malloc(w * h * n * sizeof(T));
memset(T_data, 0, w*h*n*sizeof(T));
convert_image<unsigned char, T>(input_data, T_data, w * h * n);
T* output_data = (T*)malloc(new_w * new_h * n * sizeof(T));
stbir_resize(T_data, w, h, 0, output_data, new_w, new_h, 0, type, n, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, colorspace, &g_context);
free(T_data);
stbi_image_free(input_data);
unsigned char* char_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(char));
convert_image<T, unsigned char>(output_data, char_data, new_w * new_h * n);
char output[200];
sprintf(output, "test-output/type-%d-%d-%d-%d-%s", type, colorspace, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, n, char_data, 0);
free(char_data);
free(output_data);
}
void convert_image_float(const unsigned char* input, float* output, int length)
{
for (int i = 0; i < length; i++)
output[i] = ((float)input[i])/255;
}
void convert_image_float(const float* input, unsigned char* output, int length)
{
for (int i = 0; i < length; i++)
output[i] = (unsigned char)(stbir__saturate(input[i]) * 255);
}
void test_float(const char* file, float width_percent, float height_percent, stbir_datatype type, stbir_colorspace colorspace)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
float* T_data = (float*)malloc(w * h * n * sizeof(float));
convert_image_float(input_data, T_data, w * h * n);
float* output_data = (float*)malloc(new_w * new_h * n * sizeof(float));
stbir_resize_float_generic(T_data, w, h, 0, output_data, new_w, new_h, 0, n, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, colorspace, &g_context);
free(T_data);
stbi_image_free(input_data);
unsigned char* char_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(char));
convert_image_float(output_data, char_data, new_w * new_h * n);
char output[200];
sprintf(output, "test-output/type-%d-%d-%d-%d-%s", type, colorspace, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, n, char_data, 0);
free(char_data);
free(output_data);
}
void test_channels(const char* file, float width_percent, float height_percent, int channels)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
unsigned char* channels_data = (unsigned char*)malloc(w * h * channels * sizeof(unsigned char));
for (int i = 0; i < w * h; i++)
{
int input_position = i * n;
int output_position = i * channels;
for (int c = 0; c < channels; c++)
channels_data[output_position + c] = input_data[input_position + stbir__min(c, n)];
}
unsigned char* output_data = (unsigned char*)malloc(new_w * new_h * channels * sizeof(unsigned char));
stbir_resize_uint8_srgb(channels_data, w, h, 0, output_data, new_w, new_h, 0, channels, STBIR_ALPHA_CHANNEL_NONE, 0);
free(channels_data);
stbi_image_free(input_data);
char output[200];
sprintf(output, "test-output/channels-%d-%d-%d-%s", channels, new_w, new_h, file);
stbi_write_png(output, new_w, new_h, channels, output_data, 0);
free(output_data);
}
void test_subpixel(const char* file, float width_percent, float height_percent, float s1, float t1)
{
int w, h, n;
unsigned char* input_data = stbi_load(file, &w, &h, &n, 0);
if (input_data == NULL)
return;
s1 = ((float)w - 1 + s1)/w;
t1 = ((float)h - 1 + t1)/h;
int new_w = (int)(w * width_percent);
int new_h = (int)(h * height_percent);
unsigned char* output_data = (unsigned char*)malloc(new_w * new_h * n * sizeof(unsigned char));
stbir_resize_region(input_data, w, h, 0, output_data, new_w, new_h, 0, STBIR_TYPE_UINT8, n, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0, 0, s1, t1);
stbi_image_free(input_data);
char output[200];
sprintf(output, "test-output/subpixel-%d-%d-%f-%f-%s", new_w, new_h, s1, t1, file);
stbi_write_png(output, new_w, new_h, n, output_data, 0);
free(output_data);
}
unsigned int* pixel(unsigned int* buffer, int x, int y, int c, int w, int n)
{
return &buffer[y*w*n + x*n + c];
}
void test_premul()
{
unsigned int input[2 * 2 * 4];
unsigned int output[1 * 1 * 4];
unsigned int output2[2 * 2 * 4];
memset(input, 0, sizeof(input));
// First a test to make sure premul is working properly.
// Top left - solid red
*pixel(input, 0, 0, 0, 2, 4) = 255;
*pixel(input, 0, 0, 3, 2, 4) = 255;
// Bottom left - solid red
*pixel(input, 0, 1, 0, 2, 4) = 255;
*pixel(input, 0, 1, 3, 2, 4) = 255;
// Top right - transparent green
*pixel(input, 1, 0, 1, 2, 4) = 255;
*pixel(input, 1, 0, 3, 2, 4) = 25;
// Bottom right - transparent green
*pixel(input, 1, 1, 1, 2, 4) = 255;
*pixel(input, 1, 1, 3, 2, 4) = 25;
stbir_resize(input, 2, 2, 0, output, 1, 1, 0, STBIR_TYPE_UINT32, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context);
float r = (float)255 / 4294967296;
float g = (float)255 / 4294967296;
float ra = (float)255 / 4294967296;
float ga = (float)25 / 4294967296;
float a = (ra + ga) / 2;
STBIR_ASSERT(output[0] == (unsigned int)(r * ra / 2 / a * 4294967296 + 0.5f)); // 232
STBIR_ASSERT(output[1] == (unsigned int)(g * ga / 2 / a * 4294967296 + 0.5f)); // 23
STBIR_ASSERT(output[2] == 0);
STBIR_ASSERT(output[3] == (unsigned int)(a * 4294967296 + 0.5f)); // 140
// Now a test to make sure it doesn't clobber existing values.
// Top right - completely transparent green
*pixel(input, 1, 0, 1, 2, 4) = 255;
*pixel(input, 1, 0, 3, 2, 4) = 0;
// Bottom right - completely transparent green
*pixel(input, 1, 1, 1, 2, 4) = 255;
*pixel(input, 1, 1, 3, 2, 4) = 0;
stbir_resize(input, 2, 2, 0, output2, 2, 2, 0, STBIR_TYPE_UINT32, 4, 3, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, &g_context);
STBIR_ASSERT(*pixel(output2, 0, 0, 0, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 0, 0, 1, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 0, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 0, 3, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 0, 1, 0, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 0, 1, 1, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 1, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 0, 1, 3, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 1, 0, 0, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 0, 1, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 1, 0, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 0, 3, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 1, 0, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 1, 1, 2, 4) == 255);
STBIR_ASSERT(*pixel(output2, 1, 1, 2, 2, 4) == 0);
STBIR_ASSERT(*pixel(output2, 1, 1, 3, 2, 4) == 0);
}
// test that splitting a pow-2 image into tiles produces identical results
void test_subpixel_1()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char output_data[16 * 16];
stbir_resize_region(image, 8, 8, 0, output_data, 16, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0, 0, 1, 1);
unsigned char output_left[8 * 16];
unsigned char output_right[8 * 16];
stbir_resize_region(image, 8, 8, 0, output_left, 8, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0, 0, 0.5f, 1);
stbir_resize_region(image, 8, 8, 0, output_right, 8, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0.5f, 0, 1, 1);
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 16; y++)
{
STBIR_ASSERT(output_data[y * 16 + x] == output_left[y * 8 + x]);
STBIR_ASSERT(output_data[y * 16 + x + 8] == output_right[y * 8 + x]);
}
}
}
// test that replicating an image and using a subtile of it produces same results as wraparound
void test_subpixel_2()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char large_image[32 * 32];
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 8; y++)
{
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 4; j++)
large_image[j*4*8*8 + i*8 + y*4*8 + x] = image[y*8 + x];
}
}
}
unsigned char output_data_1[16 * 16];
unsigned char output_data_2[16 * 16];
stbir_resize(image, 8, 8, 0, output_data_1, 16, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_WRAP, STBIR_EDGE_WRAP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize_region(large_image, 32, 32, 0, output_data_2, 16, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_WRAP, STBIR_EDGE_WRAP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context, 0.25f, 0.25f, 0.5f, 0.5f);
{for (int x = 0; x < 16; x++)
{
for (int y = 0; y < 16; y++)
STBIR_ASSERT(output_data_1[y * 16 + x] == output_data_2[y * 16 + x]);
}}
}
// test that 0,0,1,1 subpixel produces same result as no-rect
void test_subpixel_3()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char output_data_1[32 * 32];
unsigned char output_data_2[32 * 32];
stbir_resize_region(image, 8, 8, 0, output_data_1, 32, 32, 0, STBIR_TYPE_UINT8, 1, 0, STBIR_ALPHA_CHANNEL_NONE, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_LINEAR, NULL, 0, 0, 1, 1);
stbir_resize_uint8(image, 8, 8, 0, output_data_2, 32, 32, 0, 1);
for (int x = 0; x < 32; x++)
{
for (int y = 0; y < 32; y++)
STBIR_ASSERT(output_data_1[y * 32 + x] == output_data_2[y * 32 + x]);
}
}
// test that 1:1 resample using s,t=0,0,1,1 with bilinear produces original image
void test_subpixel_4()
{
unsigned char image[8 * 8];
mtsrand(0);
for (int i = 0; i < sizeof(image); i++)
image[i] = mtrand() & 255;
unsigned char output[8 * 8];
stbir_resize_region(image, 8, 8, 0, output, 8, 8, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_TRIANGLE, STBIR_FILTER_TRIANGLE, STBIR_COLORSPACE_LINEAR, &g_context, 0, 0, 1, 1);
STBIR_ASSERT(memcmp(image, output, 8 * 8) == 0);
}
static unsigned int image88_int[8][8];
static unsigned char image88 [8][8];
static unsigned char output88[8][8];
static unsigned char output44[4][4];
static unsigned char output22[2][2];
static unsigned char output11[1][1];
void resample_88(stbir_filter filter)
{
stbir_resize_uint8_generic(image88[0],8,8,0, output88[0],8,8,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
stbir_resize_uint8_generic(image88[0],8,8,0, output44[0],4,4,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
stbir_resize_uint8_generic(image88[0],8,8,0, output22[0],2,2,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
stbir_resize_uint8_generic(image88[0],8,8,0, output11[0],1,1,0, 1,-1,0, STBIR_EDGE_CLAMP, filter, STBIR_COLORSPACE_LINEAR, NULL);
}
void verify_box(void)
{
int i,j,t;
resample_88(STBIR_FILTER_BOX);
for (i=0; i < sizeof(image88); ++i)
STBIR_ASSERT(image88[0][i] == output88[0][i]);
t = 0;
for (j=0; j < 4; ++j)
for (i=0; i < 4; ++i) {
int n = image88[j*2+0][i*2+0]
+ image88[j*2+0][i*2+1]
+ image88[j*2+1][i*2+0]
+ image88[j*2+1][i*2+1];
STBIR_ASSERT(output44[j][i] == ((n+2)>>2) || output44[j][i] == ((n+1)>>2)); // can't guarantee exact rounding due to numerical precision
t += n;
}
STBIR_ASSERT(output11[0][0] == ((t+32)>>6) || output11[0][0] == ((t+31)>>6)); // can't guarantee exact rounding due to numerical precision
}
void verify_filter_normalized(stbir_filter filter, int output_size, unsigned int value)
{
int i, j;
unsigned int output[64];
stbir_resize(image88_int[0], 8, 8, 0, output, output_size, output_size, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, filter, filter, STBIR_COLORSPACE_LINEAR, NULL);
for (j = 0; j < output_size; ++j)
for (i = 0; i < output_size; ++i)
STBIR_ASSERT(value == output[j*output_size + i]);
}
float round2(float f)
{
return (float) floor(f+0.5f); // round() isn't C standard pre-C99
}
void test_filters(void)
{
int i,j;
mtsrand(0);
for (i=0; i < sizeof(image88); ++i)
image88[0][i] = mtrand() & 255;
verify_box();
for (i=0; i < sizeof(image88); ++i)
image88[0][i] = 0;
image88[4][4] = 255;
verify_box();
for (j=0; j < 8; ++j)
for (i=0; i < 8; ++i)
image88[j][i] = (j^i)&1 ? 255 : 0;
verify_box();
for (j=0; j < 8; ++j)
for (i=0; i < 8; ++i)
image88[j][i] = i&2 ? 255 : 0;
verify_box();
int value = 64;
for (j = 0; j < 8; ++j)
for (i = 0; i < 8; ++i)
image88_int[j][i] = value;
verify_filter_normalized(STBIR_FILTER_BOX, 8, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 8, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 8, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 8, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 8, value);
verify_filter_normalized(STBIR_FILTER_BOX, 4, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 4, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 4, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 4, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 4, value);
verify_filter_normalized(STBIR_FILTER_BOX, 2, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 2, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 2, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 2, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 2, value);
verify_filter_normalized(STBIR_FILTER_BOX, 1, value);
verify_filter_normalized(STBIR_FILTER_TRIANGLE, 1, value);
verify_filter_normalized(STBIR_FILTER_CUBICBSPLINE, 1, value);
verify_filter_normalized(STBIR_FILTER_CATMULLROM, 1, value);
verify_filter_normalized(STBIR_FILTER_MITCHELL, 1, value);
{
// This test is designed to produce coefficients that are very badly denormalized.
unsigned int v = 556;
unsigned int input[100 * 100];
unsigned int output[11 * 11];
for (j = 0; j < 100 * 100; ++j)
input[j] = v;
stbir_resize(input, 100, 100, 0, output, 11, 11, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_TRIANGLE, STBIR_FILTER_TRIANGLE, STBIR_COLORSPACE_LINEAR, NULL);
for (j = 0; j < 11 * 11; ++j)
STBIR_ASSERT(v == output[j]);
}
{
// Now test the trapezoid filter for downsampling.
unsigned int input[3 * 1];
unsigned int output[2 * 1];
input[0] = 0;
input[1] = 255;
input[2] = 127;
stbir_resize(input, 3, 1, 0, output, 2, 1, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == (unsigned int)round2((float)(input[0] * 2 + input[1]) / 3));
STBIR_ASSERT(output[1] == (unsigned int)round2((float)(input[2] * 2 + input[1]) / 3));
stbir_resize(input, 1, 3, 0, output, 1, 2, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == (unsigned int)round2((float)(input[0] * 2 + input[1]) / 3));
STBIR_ASSERT(output[1] == (unsigned int)round2((float)(input[2] * 2 + input[1]) / 3));
}
{
// Now test the trapezoid filter for upsampling.
unsigned int input[2 * 1];
unsigned int output[3 * 1];
input[0] = 0;
input[1] = 255;
stbir_resize(input, 2, 1, 0, output, 3, 1, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == input[0]);
STBIR_ASSERT(output[1] == (input[0] + input[1]) / 2);
STBIR_ASSERT(output[2] == input[1]);
stbir_resize(input, 1, 2, 0, output, 1, 3, 0, STBIR_TYPE_UINT32, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == input[0]);
STBIR_ASSERT(output[1] == (input[0] + input[1]) / 2);
STBIR_ASSERT(output[2] == input[1]);
}
// checkerboard
{
unsigned char input[64][64];
unsigned char output[16][16];
int i,j;
for (j=0; j < 64; ++j)
for (i=0; i < 64; ++i)
input[j][i] = (i^j)&1 ? 255 : 0;
stbir_resize_uint8_generic(input[0], 64, 64, 0, output[0],16,16,0, 1,-1,0,STBIR_EDGE_WRAP,STBIR_FILTER_DEFAULT,STBIR_COLORSPACE_LINEAR,0);
for (j=0; j < 16; ++j)
for (i=0; i < 16; ++i)
STBIR_ASSERT(output[j][i] == 128);
stbir_resize_uint8_srgb_edgemode(input[0], 64, 64, 0, output[0],16,16,0, 1,-1,0,STBIR_EDGE_WRAP);
for (j=0; j < 16; ++j)
for (i=0; i < 16; ++i)
STBIR_ASSERT(output[j][i] == 188);
}
{
// Test trapezoid box filter
unsigned char input[2 * 1];
unsigned char output[127 * 1];
input[0] = 0;
input[1] = 255;
stbir_resize(input, 2, 1, 0, output, 127, 1, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == 0);
STBIR_ASSERT(output[127 / 2 - 1] == 0);
STBIR_ASSERT(output[127 / 2] == 128);
STBIR_ASSERT(output[127 / 2 + 1] == 255);
STBIR_ASSERT(output[126] == 255);
stbi_write_png("test-output/trapezoid-upsample-horizontal.png", 127, 1, 1, output, 0);
stbir_resize(input, 1, 2, 0, output, 1, 127, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_BOX, STBIR_COLORSPACE_LINEAR, NULL);
STBIR_ASSERT(output[0] == 0);
STBIR_ASSERT(output[127 / 2 - 1] == 0);
STBIR_ASSERT(output[127 / 2] == 128);
STBIR_ASSERT(output[127 / 2 + 1] == 255);
STBIR_ASSERT(output[126] == 255);
stbi_write_png("test-output/trapezoid-upsample-vertical.png", 1, 127, 1, output, 0);
}
}
#define UMAX32 4294967295U
static void write32(char *filename, stbir_uint32 *output, int w, int h)
{
stbir_uint8 *data = (stbir_uint8*) malloc(w*h*3);
for (int i=0; i < w*h*3; ++i)
data[i] = output[i]>>24;
stbi_write_png(filename, w, h, 3, data, 0);
free(data);
}
static void test_32(void)
{
int w=100,h=120,x,y, out_w,out_h;
stbir_uint32 *input = (stbir_uint32*) malloc(4 * 3 * w * h);
stbir_uint32 *output = (stbir_uint32*) malloc(4 * 3 * 3*w * 3*h);
for (y=0; y < h; ++y) {
for (x=0; x < w; ++x) {
input[y*3*w + x*3 + 0] = x * ( UMAX32/w );
input[y*3*w + x*3 + 1] = y * ( UMAX32/h );
input[y*3*w + x*3 + 2] = UMAX32/2;
}
}
out_w = w*33/16;
out_h = h*33/16;
stbir_resize(input,w,h,0,output,out_w,out_h,0,STBIR_TYPE_UINT32,3,-1,0,STBIR_EDGE_CLAMP,STBIR_EDGE_CLAMP,STBIR_FILTER_DEFAULT,STBIR_FILTER_DEFAULT,STBIR_COLORSPACE_LINEAR,NULL);
write32("test-output/seantest_1.png", output,out_w,out_h);
out_w = w*16/33;
out_h = h*16/33;
stbir_resize(input,w,h,0,output,out_w,out_h,0,STBIR_TYPE_UINT32,3,-1,0,STBIR_EDGE_CLAMP,STBIR_EDGE_CLAMP,STBIR_FILTER_DEFAULT,STBIR_FILTER_DEFAULT,STBIR_COLORSPACE_LINEAR,NULL);
write32("test-output/seantest_2.png", output,out_w,out_h);
}
void test_suite(int argc, char **argv)
{
int i;
char *barbara;
_mkdir("test-output");
if (argc > 1)
barbara = argv[1];
else
barbara = "barbara.png";
// check what cases we need normalization for
#if 1
{
float x, y;
for (x = -1; x < 1; x += 0.05f) {
float sums[5] = { 0 };
float o;
for (o = -5; o <= 5; ++o) {
sums[0] += stbir__filter_mitchell(x + o, 1);
sums[1] += stbir__filter_catmullrom(x + o, 1);
sums[2] += stbir__filter_cubic(x + o, 1);
sums[3] += stbir__filter_triangle(x + o, 1);
sums[4] += stbir__filter_trapezoid(x + o, 0.5f);
}
for (i = 0; i < 5; ++i)
STBIR_ASSERT(sums[i] >= 1.0 - 0.001 && sums[i] <= 1.0 + 0.001);
}
#if 1
for (y = 0.11f; y < 1; y += 0.01f) { // Step
for (x = -1; x < 1; x += 0.05f) { // Phase
float sums[5] = { 0 };
float o;
for (o = -5; o <= 5; o += y) {
sums[0] += y * stbir__filter_mitchell(x + o, 1);
sums[1] += y * stbir__filter_catmullrom(x + o, 1);
sums[2] += y * stbir__filter_cubic(x + o, 1);
sums[4] += y * stbir__filter_trapezoid(x + o, 0.5f);
sums[3] += y * stbir__filter_triangle(x + o, 1);
}
for (i = 0; i < 3; ++i)
STBIR_ASSERT(sums[i] >= 1.0 - 0.0170 && sums[i] <= 1.0 + 0.0170);
}
}
#endif
}
#endif
#if 0 // linear_to_srgb_uchar table
for (i=0; i < 256; ++i) {
float f = stbir__srgb_to_linear((i-0.5f)/255.0f);
printf("%9d, ", (int) ((f) * (1<<28)));
if ((i & 7) == 7)
printf("\n");
}
#endif
// old tests that hacky fix worked on - test that
// every uint8 maps to itself
for (i = 0; i < 256; i++) {
float f = stbir__srgb_to_linear(float(i) / 255);
int n = stbir__linear_to_srgb_uchar(f);
STBIR_ASSERT(n == i);
}
// new tests that hacky fix failed for - test that
// values adjacent to uint8 round to nearest uint8
for (i = 0; i < 256; i++) {
for (float y = -0.42f; y <= 0.42f; y += 0.01f) {
float f = stbir__srgb_to_linear((i+y) / 255.0f);
int n = stbir__linear_to_srgb_uchar(f);
STBIR_ASSERT(n == i);
}
}
test_filters();
test_subpixel_1();
test_subpixel_2();
test_subpixel_3();
test_subpixel_4();
test_premul();
test_32();
// Some tests to make sure errors don't pop up with strange filter/dimension combinations.
stbir_resize(image88, 8, 8, 0, output88, 4, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize(image88, 8, 8, 0, output88, 4, 16, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_BOX, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize(image88, 8, 8, 0, output88, 16, 4, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_BOX, STBIR_FILTER_CATMULLROM, STBIR_COLORSPACE_SRGB, &g_context);
stbir_resize(image88, 8, 8, 0, output88, 16, 4, 0, STBIR_TYPE_UINT8, 1, STBIR_ALPHA_CHANNEL_NONE, 0, STBIR_EDGE_CLAMP, STBIR_EDGE_CLAMP, STBIR_FILTER_CATMULLROM, STBIR_FILTER_BOX, STBIR_COLORSPACE_SRGB, &g_context);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 0.5f, 0.5f, (float)i / 10, 1);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 0.5f, 0.5f, 1, (float)i / 10);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 2, 2, (float)i / 10, 1);
for (i = 0; i < 10; i++)
test_subpixel(barbara, 2, 2, 1, (float)i / 10);
// Channels test
test_channels(barbara, 0.5f, 0.5f, 1);
test_channels(barbara, 0.5f, 0.5f, 2);
test_channels(barbara, 0.5f, 0.5f, 3);
test_channels(barbara, 0.5f, 0.5f, 4);
test_channels(barbara, 2, 2, 1);
test_channels(barbara, 2, 2, 2);
test_channels(barbara, 2, 2, 3);
test_channels(barbara, 2, 2, 4);
// filter tests
resize_image(barbara, 2, 2, STBIR_FILTER_BOX , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-nearest.png");
resize_image(barbara, 2, 2, STBIR_FILTER_TRIANGLE , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-bilinear.png");
resize_image(barbara, 2, 2, STBIR_FILTER_CUBICBSPLINE, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-bicubic.png");
resize_image(barbara, 2, 2, STBIR_FILTER_CATMULLROM , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-catmullrom.png");
resize_image(barbara, 2, 2, STBIR_FILTER_MITCHELL , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-upsample-mitchell.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_BOX , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-nearest.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_TRIANGLE , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-bilinear.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_CUBICBSPLINE, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-bicubic.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_CATMULLROM , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-catmullrom.png");
resize_image(barbara, 0.5f, 0.5f, STBIR_FILTER_MITCHELL , STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, "test-output/barbara-downsample-mitchell.png");
for (i = 10; i < 100; i++)
{
char outname[200];
sprintf(outname, "test-output/barbara-width-%d.jpg", i);
resize_image(barbara, (float)i / 100, 1, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 110; i < 500; i += 10)
{
char outname[200];
sprintf(outname, "test-output/barbara-width-%d.jpg", i);
resize_image(barbara, (float)i / 100, 1, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 10; i < 100; i++)
{
char outname[200];
sprintf(outname, "test-output/barbara-height-%d.jpg", i);
resize_image(barbara, 1, (float)i / 100, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 110; i < 500; i += 10)
{
char outname[200];
sprintf(outname, "test-output/barbara-height-%d.jpg", i);
resize_image(barbara, 1, (float)i / 100, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
for (i = 50; i < 200; i += 10)
{
char outname[200];
sprintf(outname, "test-output/barbara-width-height-%d.jpg", i);
resize_image(barbara, 100 / (float)i, (float)i / 100, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_SRGB, outname);
}
test_format<unsigned short>(barbara, 0.5, 2.0, STBIR_TYPE_UINT16, STBIR_COLORSPACE_SRGB);
test_format<unsigned short>(barbara, 0.5, 2.0, STBIR_TYPE_UINT16, STBIR_COLORSPACE_LINEAR);
test_format<unsigned short>(barbara, 2.0, 0.5, STBIR_TYPE_UINT16, STBIR_COLORSPACE_SRGB);
test_format<unsigned short>(barbara, 2.0, 0.5, STBIR_TYPE_UINT16, STBIR_COLORSPACE_LINEAR);
test_format<unsigned int>(barbara, 0.5, 2.0, STBIR_TYPE_UINT32, STBIR_COLORSPACE_SRGB);
test_format<unsigned int>(barbara, 0.5, 2.0, STBIR_TYPE_UINT32, STBIR_COLORSPACE_LINEAR);
test_format<unsigned int>(barbara, 2.0, 0.5, STBIR_TYPE_UINT32, STBIR_COLORSPACE_SRGB);
test_format<unsigned int>(barbara, 2.0, 0.5, STBIR_TYPE_UINT32, STBIR_COLORSPACE_LINEAR);
test_float(barbara, 0.5, 2.0, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_SRGB);
test_float(barbara, 0.5, 2.0, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_LINEAR);
test_float(barbara, 2.0, 0.5, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_SRGB);
test_float(barbara, 2.0, 0.5, STBIR_TYPE_FLOAT, STBIR_COLORSPACE_LINEAR);
// Edge behavior tests
resize_image("hgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR, "test-output/hgradient-clamp.png");
resize_image("hgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_WRAP, STBIR_COLORSPACE_LINEAR, "test-output/hgradient-wrap.png");
resize_image("vgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR, "test-output/vgradient-clamp.png");
resize_image("vgradient.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_WRAP, STBIR_COLORSPACE_LINEAR, "test-output/vgradient-wrap.png");
resize_image("1px-border.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_LINEAR, "test-output/1px-border-reflect.png");
resize_image("1px-border.png", 2, 2, STBIR_FILTER_CATMULLROM, STBIR_EDGE_CLAMP, STBIR_COLORSPACE_LINEAR, "test-output/1px-border-clamp.png");
// sRGB tests
resize_image("gamma_colors.jpg", .5f, .5f, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_SRGB, "test-output/gamma_colors.jpg");
resize_image("gamma_2.2.jpg", .5f, .5f, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_SRGB, "test-output/gamma_2.2.jpg");
resize_image("gamma_dalai_lama_gray.jpg", .5f, .5f, STBIR_FILTER_CATMULLROM, STBIR_EDGE_REFLECT, STBIR_COLORSPACE_SRGB, "test-output/gamma_dalai_lama_gray.jpg");
}
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