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{bp-19685} video/rgbcolors: Fix RGBTO8 to use the high bits of each component. #19689

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{bp-19685} video/rgbcolors: Fix RGBTO8 to use the high bits of each component. #19689

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9 changes: 7 additions & 2 deletions include/nuttx/video/rgbcolors.h
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Original file line number Diff line number Diff line change
Expand Up @@ -72,10 +72,15 @@
#define RGB16GREEN(rgb) (((rgb) >> 3) & 0xfc)
#define RGB16BLUE(rgb) (((rgb) << 3) & 0xf8)

/* This macro creates RGB8 (3:3:2) from 8:8:8 RGB */
/* This macro creates RGB8 (3:3:2) from 8:8:8 RGB:
*
* R[7:5] -> RGB[7:5]
* G[7:5] -> RGB[4:2]
* B[7:6] -> RGB[1:0]
*/

#define RGBTO8(r,g,b) \
((((uint8_t)(r) << 5) & 0xe0) | (((uint8_t)(g) << 2) & 0x1c) | ((uint8_t)(b) & 0x03))
(((uint8_t)(r) & 0xe0) | (((uint8_t)(g) & 0xe0) >> 3) | (((uint8_t)(b) & 0xc0) >> 6))

/* And these macros perform the inverse transformation */

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