88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
#ifndef COLOR_H
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#define COLOR_H
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#include <stdint.h>
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#include <string.h>
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#include "endianness.h"
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#ifdef __LITTLE_ENDIAN__
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static const uint_fast32_t TRANSPARENT_MASK = 0x00ffffff;
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#else
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static const uint_fast32_t TRANSPARENT_MASK = 0xffffff00;
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#endif
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static inline uint_fast32_t color(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
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#ifdef __LITTLE_ENDIAN__
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return b | g << 8 | r << 16 | a << 24;
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#else
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return a | r << 8 | g << 16 | b << 24;
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#endif
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}
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static inline uint_fast32_t alpha_mask(uint8_t a) {
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#ifdef __LITTLE_ENDIAN__
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return TRANSPARENT_MASK | a << 24;
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#else
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return TRANSPARENT_MASK | a;
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#endif
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}
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static inline void rgb565_le(const uint16_t d, uint8_t *r, uint8_t *g, uint8_t *b) {
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#ifdef __LITTLE_ENDIAN__
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*r = (d >> 8 & 0xf8) | (d >> 13);
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*g = (d >> 3 & 0xfc) | (d >> 9 & 3);
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*b = (d << 3) | (d >> 2 & 7);
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#else
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*r = (d & 0xf8) | (d >> 5 & 7);
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*g = (d << 5 & 0xe0) | (d >> 11 & 0x1c) | (d >> 1 & 3);
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*b = (d >> 5 & 0xf8) | (d >> 10 & 0x7);
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#endif
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}
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static inline void rgb565_be(const uint16_t d, uint8_t *r, uint8_t *g, uint8_t *b) {
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#ifdef __BIG_ENDIAN__
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*r = (d >> 8 & 0xf8) | (d >> 13);
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*g = (d >> 3 & 0xfc) | (d >> 9 & 3);
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*b = (d << 3) | (d >> 2 & 7);
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#else
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*r = (d & 0xf8) | (d >> 5 & 7);
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*g = (d << 5 & 0xe0) | (d >> 11 & 0x1c) | (d >> 1 & 3);
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*b = (d >> 5 & 0xf8) | (d >> 10 & 0x7);
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#endif
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}
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static inline void rgb565_lep(const uint16_t d, uint8_t *c) {
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#ifdef __LITTLE_ENDIAN__
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*(c++) = (d >> 8 & 0xf8) | (d >> 13);
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*(c++) = (d >> 3 & 0xfc) | (d >> 9 & 3);
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*(c++) = (d << 3) | (d >> 2 & 7);
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#else
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*(c++) = (d & 0xf8) | (d >> 5 & 7);
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*(c++) = (d << 5 & 0xe0) | (d >> 11 & 0x1c) | (d >> 1 & 3);
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*(c++) = (d >> 5 & 0xf8) | (d >> 10 & 0x7);
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#endif
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}
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static inline void rgb565_bep(const uint16_t d, uint8_t *c) {
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#ifdef __BIG_ENDIAN__
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*(c++) = (d >> 8 & 0xf8) | (d >> 13);
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*(c++) = (d >> 3 & 0xfc) | (d >> 9 & 3);
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*(c++) = (d << 3) | (d >> 2 & 7);
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#else
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*(c++) = (d & 0xf8) | (d >> 5 & 7);
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*(c++) = (d << 5 & 0xe0) | (d >> 11 & 0x1c) | (d >> 1 & 3);
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*(c++) = (d >> 5 & 0xf8) | (d >> 10 & 0x7);
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#endif
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}
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static inline void copy_block_buffer(const long bx, const long by, const long w, const long h, const long bw,
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const long bh, const uint32_t *buffer, uint32_t *image) {
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long x = bw * bx;
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long xl = (bw * (bx + 1) > w ? w - bw * bx : bw) * 4;
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const uint32_t *buffer_end = buffer + bw * bh;
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for (long y = by * bh; buffer < buffer_end && y < h; buffer += bw, y++)
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memcpy(image + y * w + x, buffer, xl);
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}
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#endif /* end of include guard: COLOR_H */
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