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Add two new sqrt functions
* Add vsqrt implemented with VSQRT instruction * Add fsqrt IEEE float dependant approximation
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@ -63,31 +63,51 @@ const uint8_t xyz_table[256]= {
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93.868573, 94.730654, 95.597335, 96.468625, 97.344529, 98.225055, 99.110210, 100.000000,
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};
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uint16_t imlib_lab_distance(struct color *c0, struct color *c1)
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float vsqrt(float x)
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{
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uint16_t sum=0;
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asm volatile (
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"vsqrt.f32 %[r], %[x]\n"
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: [r] "=t" (x)
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: [x] "t" (x));
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return x;
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}
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/* This is slightly faster the VSQRT */
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uint32_t fsqrt(float x)
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{
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uint32_t i = *(uint32_t*) &x;
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// adjust bias
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i += 127 << 23;
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// approximation of square root
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i >>= 1;
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return (uint32_t) *(float*) &i;
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}
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uint32_t imlib_lab_distance(struct color *c0, struct color *c1)
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{
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uint32_t sum=0;
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sum += (c0->L - c1->L) * (c0->L - c1->L);
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sum += (c0->A - c1->A) * (c0->A - c1->A);
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sum += (c0->B - c1->B) * (c0->B - c1->B);
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return (uint16_t) sqrtf(sum);
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return fsqrt(sum);
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}
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uint16_t imlib_rgb_distance(struct color *c0, struct color *c1)
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uint32_t imlib_rgb_distance(struct color *c0, struct color *c1)
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{
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uint16_t sum=0;
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uint32_t sum=0;
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sum += (c0->r - c1->r) * (c0->r - c1->r);
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sum += (c0->g - c1->g) * (c0->g - c1->g);
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sum += (c0->b - c1->b) * (c0->b - c1->b);
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return (uint16_t) sqrtf(sum);
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return fsqrt(sum);
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}
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uint16_t imlib_hsv_distance(struct color *c0, struct color *c1)
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uint32_t imlib_hsv_distance(struct color *c0, struct color *c1)
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{
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uint16_t sum=0;
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uint32_t sum=0;
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sum += (c0->h - c1->h) * (c0->h - c1->h);
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sum += (c0->s - c1->s) * (c0->s - c1->s);
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sum += (c0->v - c1->v) * (c0->v - c1->v);
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return (uint16_t) sqrtf(sum);
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return fsqrt(sum);
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}
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void imlib_rgb_to_lab(struct color *rgb, struct color *lab)
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@ -152,6 +152,9 @@ typedef struct cascade {
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int8_t *rectangles_array;
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} cascade_t;
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float vsqrt(float x);
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uint32_t fsqrt(float x);
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/* Point functions */
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point_t *point_alloc(int x, int y);
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int point_equal(point_t *p1, point_t *p2);
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@ -169,9 +172,9 @@ struct array *rectangle_merge(struct array *r);
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array_t *cluster_kmeans(array_t *points, int k);
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/* Dela E on RGB/HSV/LAB */
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uint16_t imlib_lab_distance(struct color *c0, struct color *c1);
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uint16_t imlib_rgb_distance(struct color *c0, struct color *c1);
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uint16_t imlib_rgb_distance(struct color *c0, struct color *c1);
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uint32_t imlib_lab_distance(struct color *c0, struct color *c1);
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uint32_t imlib_rgb_distance(struct color *c0, struct color *c1);
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uint32_t imlib_rgb_distance(struct color *c0, struct color *c1);
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/* Color space conversion */
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void imlib_rgb_to_lab(struct color *rgb, struct color *lab);
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