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/****************************************************************************
* graphics/nxglib/fb/nxglib_setpixel.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <nuttx/video/fb.h>
#include <nuttx/nx/nxglib.h>
#include "nxglib_bitblit.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
#ifndef NXGLIB_SUFFIX
# error "NXGLIB_SUFFIX must be defined before including this header file"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxgl_setpixel_*bpp
*
* Descripton:
* Draw a single pixel in frambuffer memory at the given position and with
* the given color. This is equivalent to nxgl_fillrectangle_*bpp() with
* a 1x1 rectangle but is more efficient.
*
****************************************************************************/
void NXGL_FUNCNAME(nxgl_setpixel,NXGLIB_SUFFIX)
(FAR struct fb_planeinfo_s *pinfo,
FAR const struct nxgl_point_s *pos,
NXGL_PIXEL_T color)
{
FAR uint8_t *dest;
#if NXGLIB_BITSPERPIXEL < 8
uint8_t shift;
uint8_t mask;
#else
FAR NXGL_PIXEL_T *pixel;
#endif
/* Get the address of the first byte of the pixel to write */
dest = pinfo->fbmem + pos->y * pinfo->stride + NXGL_SCALEX(pos->x);
#if NXGLIB_BITSPERPIXEL < 8
/* Shift the color into the proper position */
# ifdef CONFIG_NX_PACKEDMSFIRST
#if NXGLIB_BITSPERPIXEL == 1
shift = (7 - (pos->x & 7)); /* Shift is 0, 1, ... 7 */
mask = (1 << shift); /* Mask is 0x01, 0x02, .. 0x80 */
color <<= shift; /* Color is positioned under the mask */
#elif NXGLIB_BITSPERPIXEL == 2
shift = (6 - ((pos->x & 3) << 1)); /* Shift is 0, 2, 4, or 6 */
mask = (3 << shift); /* Mask is 0x03, 0x0c, 0x30, or 0xc0 */
color <<= shift; /* Color is positioned under the mask */
#elif NXGLIB_BITSPERPIXEL == 4
shift = (4 - ((pos->x & 1) << 2)); /* Shift is 0 or 4 */
mask = (15 << shift); /* Mask is 0x0f or 0xf0 */
color <<= shift; /* Color is positioned under the mask */
#else
# error "Unsupport pixel depth"
#endif
# else /* CONFIG_NX_PACKEDMSFIRST */
#if NXGLIB_BITSPERPIXEL == 1
shift = (pos->x & 7); /* Shift is 0, 1, ... 7 */
mask = (1 << shift); /* Mask is 0x01, 0x02, .. 0x80 */
color <<= shift; /* Color is positioned under the mask */
#elif NXGLIB_BITSPERPIXEL == 2
shift = (pos->x & 3) << 1; /* Shift is 0, 2, 4, or 6 */
mask = (3 << shift); /* Mask is 0x03, 0x0c, 0x30, or 0xc0 */
color <<= shift; /* Color is positioned under the mask */
#elif NXGLIB_BITSPERPIXEL == 4
shift = (pos->x & 1) << 2; /* Shift is 0 or 4 */
mask = (15 << shift); /* Mask is 0x0f or 0xf0 */
color <<= shift; /* Color is positioned under the mask */
#else
# error "Unsupport pixel depth"
#endif
#endif /* CONFIG_NX_PACKEDMSFIRST */
/* Handle masking of the fractional byte */
*dest = (*dest & ~mask) | (color & mask);
#else
/* Write the pixel (proper alignment assumed) */
pixel = (FAR NXGL_PIXEL_T *)dest;
*pixel = color;
#endif
}
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