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/* See LICENSE file for copyright and license details. */
#include "liblss16.h"
#include <string.h>
#if defined(__clang__)
# pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
#endif
int
liblss16_encoder_init(struct liblss16_encoder *encoder, const struct liblss16_header *header,
int rgb6, enum liblss16_encode_error *error_out)
{
int i;
memset(encoder, 0, sizeof(*encoder));
memcpy(&encoder->header, header, sizeof(*header));
if (!encoder->header.width || !encoder->header.height || encoder->header.height >> 15) {
if (error_out)
*error_out = LIBLSS16_ENCODE_BAD_IMAGE_SIZE;
return -1;
}
if (rgb6) {
uint8_t or = 0;
for (i = 0; i < 16; i++) {
or |= encoder->header.colour_map[i].r;
or |= encoder->header.colour_map[i].g;
or |= encoder->header.colour_map[i].b;
}
if (or & 0xC0) {
if (error_out)
*error_out = LIBLSS16_ENCODE_BAD_COLOUR;
return -1;
}
} else {
struct liblss16_colour *map = encoder->header.colour_map;
for (i = 0; i < 16; i++) {
map[i].r = (uint8_t)(((unsigned)map[i].r * 63U + 127U) / 255U);
map[i].g = (uint8_t)(((unsigned)map[i].g * 63U + 127U) / 255U);
map[i].b = (uint8_t)(((unsigned)map[i].b * 63U + 127U) / 255U);
}
}
encoder->x_rem = encoder->header.width;
encoder->y_rem = encoder->header.height;
return 0;
}
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