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/* ----------------------------------------------------------------------- *
*
* Copyright 2006-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* fmtpixel.h
*
* Inline function to format a single pixel
*/
#ifndef LIB_SYS_VESA_FMTPIXEL_H
#define LIB_SYS_VESA_FMTPIXEL_H
#include <inttypes.h>
#include "video.h"
/* Format a pixel and return the advanced pointer.
THIS FUNCTION IS ALLOWED TO WRITE BEYOND THE END OF THE PIXEL. */
static inline __attribute__((always_inline))
void *format_pixel(void *ptr, uint32_t bgra, enum vesa_pixel_format fmt)
{
switch (fmt) {
case PXF_BGRA32:
*(uint32_t *)ptr = bgra;
ptr = (uint32_t *)ptr + 1;
break;
case PXF_BGR24:
*(uint32_t *)ptr = bgra;
ptr = (uint8_t *)ptr + 3;
break;
case PXF_LE_RGB16_565:
{
uint16_t pxv =
((bgra >> 3) & 0x1f) +
((bgra >> (2+8-5)) & (0x3f << 5)) +
((bgra >> (3+16-11)) & (0x1f << 11));
*(uint16_t *)ptr = pxv;
ptr = (uint16_t *)ptr + 1;
}
break;
case PXF_LE_RGB15_555:
{
uint16_t pxv =
((bgra >> 3) & 0x1f) +
((bgra >> (2+8-5)) & (0x1f << 5)) +
((bgra >> (3+16-10)) & (0x1f << 10));
*(uint16_t *)ptr = pxv;
ptr = (uint16_t *)ptr + 1;
}
break;
case PXF_NONE: /* Shuts up gcc */
break;
}
return ptr;
}
#endif /* LIB_SYS_VESA_FMTPIXEL_H */
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