Source Code for Smooth Image Resampling (Resizing)

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inline __m128i interpolate(__m128i a, __m128i b, int weight) { __m128i w = _mm_set1_epi16(weight); __m128i wInv = _mm_sub_epi16(_mm_set1_epi16(256), w); __m128i weightedA = _mm_mullo_epi16(a, wInv); __m128i weightedB = _mm_mullo_epi16(b, w); __m128i sum = _mm_add_epi16(weightedA, weightedB); return _mm_srli_epi16(sum, 8); // divide by 256 } void resize(unsigned char* sc, int w1, int h1, unsigned char* dest, int w2, int h2, int yoff, int yoffend, int xoff, int xoffend) { const float dx = (float)w1 / (float)w2; const float dy = (float)h1 / (float)h2; for (int y = yoff; y < yoffend; ++y) { // Compute source row indices and interpolation weights int y1 = (int)(dy * (float)y); int y2 = (int)(dy * (float)(y + 1)) - 1; int w1y = y1 * w1; int w2y = (y - yoff) * w2; int w2yend = (y + 1 - yoff) * w2; int weight1 = (int)((dy * (float)y - (float)y1) * 256.f); int weight2 = 256 - weight1; for (int x = xoff; x < xoffend; x += 4) { // Compute source column indices and interpolation weights int x1 = (int)(dx * (float)x); int x2 = (int)(dx * (float)(x + 4)) - 1; __m128i w1x = _mm_set_epi16( sc[(y1 * w1) + x2], sc[(y1 * w1) + x1], sc[(y1 * w1) + x2 - 1], sc[(y1 * w1) + x1 - 1]…

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