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VC6:

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support using inline asm for cpuid

YCbCr:
  switch SSE code to constants that match old C;
  create C version that is same as SSE;
  tiny optimization(?) of SSE
This commit is contained in:
Sean Barrett
2014-12-19 04:39:04 -08:00
parent b082091bcb
commit f259bf27e9
2 changed files with 114 additions and 24 deletions
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39
tests/image_test.c
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@ -9,9 +9,48 @@
#define PNGSUITE_PRIMARY
#if 1
void test_ycbcr(void)
{
STBI_SIMD_ALIGN(unsigned char, y[256]);
STBI_SIMD_ALIGN(unsigned char, cb[256]);
STBI_SIMD_ALIGN(unsigned char, cr[256]);
STBI_SIMD_ALIGN(unsigned char, out1[256][4]);
STBI_SIMD_ALIGN(unsigned char, out2[256][4]);
int i,j,k;
int count = 0, bigcount=0;
for (i=0; i < 256; ++i) {
for (j=0; j < 256; ++j) {
for (k=0; k < 256; ++k) {
y[k] = k;
cb[k] = j;
cr[k] = i;
}
stbi__YCbCr_to_RGB_sse2(out1[0], y, cb, cr, 256, 4);
stbi__YCbCr_to_RGB_backport(out2[0], y, cb, cr, 256, 4);
for (k=0; k < 256; ++k) {
if (out1[k][0] != out2[k][0] || out1[k][1] != out2[k][1] || out1[k][2] != out2[k][2]) {
int dist1 = abs(out1[k][0] - out2[k][0]);
int dist2 = abs(out1[k][1] - out2[k][1]);
int dist3 = abs(out1[k][2] - out2[k][2]);
++count;
if (dist2)
++bigcount;
}
}
}
printf("So far: %d (%d big)\n", count, bigcount);
}
printf("Final: %d (%d big)\n", count, bigcount);
}
#endif
int main(int argc, char **argv)
{
int w,h;
test_ycbcr();
if (argc > 1) {
int i;
for (i=1; i < argc; ++i) {