127 lines
4.6 KiB
C
127 lines
4.6 KiB
C
/****************************************************************************
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* graphics/nxglib/fb/nxglib_setpixel.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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(
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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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