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Copy pathlibglitter_split_uint64_raster.c
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libglitter_split_uint64_raster.c
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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
void
libglitter_split_uint64_raster(uint16_t *rasters[3], uint16_t **alphap, uint64_t *raster,
uint64_t red, uint64_t green, uint64_t blue)
{
uint64_t alpha, map;
size_t position;
unsigned char channel;
alpha = ~(red | green | blue);
red /= 0xFF;
green /= 0xFF;
blue /= 0xFF;
alpha /= 0xFF;
red *= 0;
green *= 1;
blue *= 2;
alpha *= 3;
map = red | green | blue | alpha;
for (position = 0; position < 4; position++) {
channel = ((const unsigned char *)&map)[position * sizeof(uint16_t)];
if (channel < 3)
rasters[channel] = &((uint16_t *)raster)[position];
else if (alphap)
*alphap = &((uint16_t *)raster)[position];
}
}
#else
static void
check(int with_alpha, int r, int g, int b, int a)
{
int red_shift = r * (int)sizeof(uint16_t) * 8;
int green_shift = g * (int)sizeof(uint16_t) * 8;
int blue_shift = b * (int)sizeof(uint16_t) * 8;
int alpha_shift = a * (int)sizeof(uint16_t) * 8;
uint16_t full = (uint16_t)~0U;
uint16_t red = (uint16_t)~0U / (uint16_t)0xF * (uint16_t)0x5;
uint16_t green = (uint16_t)~0U / (uint16_t)0xF * (uint16_t)0x8;
uint16_t blue = (uint16_t)~0U / (uint16_t)0xF * (uint16_t)0xA;
uint16_t alpha = (uint16_t)~0U / (uint16_t)0xF * (uint16_t)0x9;
uint64_t red_mask = (uint64_t)red << red_shift;
uint64_t green_mask = (uint64_t)green << green_shift;
uint64_t blue_mask = (uint64_t)blue << blue_shift;
uint64_t alpha_mask = (uint64_t)alpha << alpha_shift;
uint64_t raster = red_mask | green_mask | blue_mask | alpha_mask;
uint16_t *rasters[4] = {NULL, NULL, NULL, NULL};
ASSERT(r != g && r != b && r != a);
ASSERT(g != b && g != a);
ASSERT(b != a);
libglitter_split_uint64_raster(rasters,
with_alpha ? &rasters[3] : NULL,
&raster,
(uint64_t)full << red_shift,
(uint64_t)full << green_shift,
(uint64_t)full << blue_shift);
ASSERT(rasters[0]);
ASSERT(rasters[1]);
ASSERT(rasters[2]);
ASSERT(*rasters[0] == red);
ASSERT(*rasters[1] == green);
ASSERT(*rasters[2] == blue);
if (with_alpha) {
ASSERT(rasters[3]);
ASSERT(*rasters[3] == alpha);
} else {
ASSERT(!rasters[3]);
}
}
int
main(void)
{
check(0, 0, 1, 2, 3);
check(0, 0, 1, 3, 2);
check(0, 0, 2, 1, 3);
check(0, 0, 2, 3, 1);
check(0, 0, 3, 1, 2);
check(0, 0, 3, 2, 1);
check(0, 1, 0, 2, 3);
check(0, 1, 0, 3, 2);
check(0, 1, 2, 0, 3);
check(0, 1, 2, 3, 0);
check(0, 1, 3, 0, 2);
check(0, 1, 3, 2, 0);
check(0, 2, 0, 1, 3);
check(0, 2, 0, 3, 1);
check(0, 2, 1, 0, 3);
check(0, 2, 1, 3, 0);
check(0, 2, 3, 0, 1);
check(0, 2, 3, 1, 0);
check(0, 3, 0, 1, 2);
check(0, 3, 0, 2, 1);
check(0, 3, 1, 0, 2);
check(0, 3, 1, 2, 0);
check(0, 3, 2, 0, 1);
check(0, 3, 2, 1, 0);
check(1, 0, 1, 2, 3);
check(1, 0, 1, 3, 2);
check(1, 0, 2, 1, 3);
check(1, 0, 2, 3, 1);
check(1, 0, 3, 1, 2);
check(1, 0, 3, 2, 1);
check(1, 1, 0, 2, 3);
check(1, 1, 0, 3, 2);
check(1, 1, 2, 0, 3);
check(1, 1, 2, 3, 0);
check(1, 1, 3, 0, 2);
check(1, 1, 3, 2, 0);
check(1, 2, 0, 1, 3);
check(1, 2, 0, 3, 1);
check(1, 2, 1, 0, 3);
check(1, 2, 1, 3, 0);
check(1, 2, 3, 0, 1);
check(1, 2, 3, 1, 0);
check(1, 3, 0, 1, 2);
check(1, 3, 0, 2, 1);
check(1, 3, 1, 0, 2);
check(1, 3, 1, 2, 0);
check(1, 3, 2, 0, 1);
check(1, 3, 2, 1, 0);
return 0;
}
#endif