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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/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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