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Four new tests of subpixel stuff.

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This commit is contained in:
Jorge Rodriguez 2014-08-12 12:15:12 -07:00
parent 419a5ba10f
commit 6ae729d61a
1 changed files with 159 additions and 0 deletions
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159
tests/resample_test.cpp
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@ -21,6 +21,58 @@
#include <sys/timeb.h>
#endif
#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;
}
void test_suite();
int main(int argc, char** argv)
@ -297,8 +349,115 @@ void test_premul(const char* file)
free(output_data);
}
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];
stbr_resize_arbitrary(image, 8, 8, 0, output_data, 16, 16, 0, 0, 0, 1, 1, 1, -1, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB);
unsigned char output_left[8 * 16];
unsigned char output_right[8 * 16];
stbr_resize_arbitrary(image, 8, 8, 0, output_left, 8, 16, 0, 0, 0, 0.5f, 1, 1, -1, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB);
stbr_resize_arbitrary(image, 8, 8, 0, output_right, 8, 16, 0, 0.5f, 0, 1, 1, 1, -1, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB);
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 16; y++)
{
STBR_ASSERT(output_data[y * 16 + x] == output_left[y * 8 + x]);
STBR_ASSERT(output_data[y * 16 + x + 8] == output_right[y * 8 + x]);
}
}
}
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];
stbr_resize_arbitrary(image, 8, 8, 0, output_data_1, 16, 16, 0, 0, 0, 1, 1, 1, -1, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_WRAP, STBR_COLORSPACE_SRGB);
stbr_resize_arbitrary(large_image, 32, 32, 0, output_data_2, 16, 16, 0, 0.25f, 0.25f, 0.5f, 0.5f, 1, -1, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB);
for (int x = 0; x < 16; x++)
{
for (int y = 0; y < 16; y++)
STBR_ASSERT(output_data_1[y * 16 + x] == output_data_2[y * 16 + x]);
}
}
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];
stbr_resize_uint8_subpixel(image, 8, 8, output_data_1, 32, 32, 0, 0, 1, 1, 1, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP);
stbr_resize_uint8_srgb(image, 8, 8, output_data_2, 32, 32, 1, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP);
for (int x = 0; x < 32; x++)
{
for (int y = 0; y < 32; y++)
STBR_ASSERT(output_data_1[y * 32 + x] == output_data_2[y * 32 + x]);
}
}
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];
stbr_resize_arbitrary(image, 8, 8, 0, output, 8, 8, 0, 0, 0, 1, 1, 1, -1, STBR_TYPE_UINT8, STBR_FILTER_BILINEAR, STBR_EDGE_CLAMP, STBR_COLORSPACE_LINEAR);
STBR_ASSERT(memcmp(image, output, 8 * 8) == 0);
}
void test_suite()
{
test_subpixel_1();
test_subpixel_2();
test_subpixel_3();
test_subpixel_4();
test_premul("barbara.png");
for (int i = 0; i < 10; i++)