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