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Normalize downsample coefficients.

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This commit is contained in:
Jorge Rodriguez
2014-09-09 15:22:29 -07:00
parent 43fbc1d5e3
commit 497eab8339
2 changed files with 31 additions and 9 deletions
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20
tests/resample_test.cpp
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@ -631,6 +631,22 @@ void test_filters(void)
verify_filter_normalized(STBIR_FILTER_BICUBIC, 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.
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_BILINEAR, STBIR_FILTER_BILINEAR, STBIR_COLORSPACE_LINEAR, NULL);
for (j = 0; j < 11 * 11; ++j)
STBIR_ASSERT(v == output[j]);
}
}
@ -663,8 +679,8 @@ void test_suite(int argc, char **argv)
}
#if 1
for (y = 0.11f; y < 1; y += 0.01f) {
for (x = -1; x < 1; x += 0.05f) {
for (y = 0.11f; y < 1; y += 0.01f) { // Step
for (x = -1; x < 1; x += 0.05f) { // Phase
float sums[4] = {0};
float o;
for (o=-5; o <= 5; o += y) {