Ishotihadus
67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
#include "rgb.h"
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#include "common.h"
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#include <stdint.h>
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void decode_a8(const uint8_t* data, const int size, uint8_t* image)
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{
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const uint8_t *d = data, *d_end = data + size;
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for (int i = 0; d < d_end; d++) {
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image[i++] = *d;
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image[i++] = *d;
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image[i++] = *d;
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}
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}
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void decode_r8(const uint8_t* data, const int size, uint8_t* image)
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{
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const uint8_t *d = data, *d_end = data + size;
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for (int i = 0; d < d_end; d++) {
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image[i++] = *d;
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image[i++] = 0;
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image[i++] = 0;
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}
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}
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void decode_r16(const uint16_t* data, const int size, const int endian_big, uint8_t* image)
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{
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const uint16_t *d = data, *d_end = data + size;
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if (IS_LITTLE_ENDIAN == !endian_big) {
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// Same endian
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for (int i = 0; d < d_end; d++) {
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uint8_t c = *d >> 8;
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image[i++] = c;
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image[i++] = 0;
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image[i++] = 0;
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}
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} else {
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// Different endian
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for (int i = 0; d < d_end; d++) {
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image[i++] = *d;
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image[i++] = 0;
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image[i++] = 0;
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}
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}
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}
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void decode_rgb565(const uint16_t* data, const int size, const int endian_big, uint8_t* image)
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{
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const uint16_t *d = data, *d_end = data + size;
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if (IS_LITTLE_ENDIAN == !endian_big) {
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// Same endian
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// RRRRR GGG | GGG BBBBB
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for (int i = 0; d < d_end; d++) {
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image[i++] = (*d >> 8 & 0xf8) | (*d >> 13);
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image[i++] = (*d >> 3 & 0xfc) | (*d >> 9 & 3);
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image[i++] = (*d << 3) | (*d >> 2 & 7);
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}
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} else {
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// Different endian
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// GGG BBBBB | RRRRR GGG
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for (int i = 0; d < d_end; d++) {
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image[i++] = (*d & 0xf8) | (*d >> 5 & 7);
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image[i++] = (*d << 5 & 0xe0) | (*d >> 11 & 0x1c) | (*d >> 1 & 3);
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image[i++] = (*d >> 5 & 0xf8) | (*d >> 10 & 0x7);
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}
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}
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}
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