236 lines
7.4 KiB
C
236 lines
7.4 KiB
C
/****************************************************************************
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* graphics/nxglib/nxglib_cursor_draw.c
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*
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* Copyright (C) 2019 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 <assert.h>
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#include <nuttx/nx/nxglib.h>
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#include "nxglib_bitblit.h"
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#include "../nxbe/nxbe.h"
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#include "nxglib.h"
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#ifdef CONFIG_NX_SWCURSOR
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxbe_map_color
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*
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* Description:
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* Map a 2-bit cursor pixel value to a device pixel value
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*
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* REVISIT: If we really were to support multiple displays (or planes)
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* with differing pixel depth, then the cursor.color1,2,3 would be
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* insufficient: There would have to be multiple color sets for each
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* plane.
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*
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* Input Parameters:
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* be - The back-end state structure instance
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* pixel - Pixel to be mapped
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*
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* Returned Value:
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* The mapped pixel.
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*
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****************************************************************************/
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static NXGL_PIXEL_T nxbe_map_color(FAR struct nxbe_state_s *be, int plane,
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uint8_t pixel)
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{
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switch (pixel)
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{
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case 0:
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default:
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return 0; /* Should not happen */
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case 1:
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return be->cursor.color1[plane];
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case 2:
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return be->cursor.color2[plane];
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case 3:
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return be->cursor.color3[plane];
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}
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxglib_cursor_draw
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*
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* Description:
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* Update the cursor region by drawing directly in device memory.
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*
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* Input Parameters:
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* be - The back-end state structure instance
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* bounds - The region of the display that has been modified.
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* planeno - The color plane being drawn
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void NXGL_FUNCNAME(nxglib_cursor_draw, NXGLIB_SUFFIX)
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(FAR struct nxbe_state_s *be, FAR const struct nxgl_rect_s *bounds, int planeno)
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{
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struct nxgl_rect_s intersection;
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struct nxgl_point_s origin;
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FAR struct nxbe_plane_s *plane;
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FAR uint8_t *fbmem;
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FAR const uint8_t *src;
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FAR const uint8_t *sline;
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FAR uint8_t *dline;
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FAR NXGL_PIXEL_T *dest;
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nxgl_coord_t width;
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nxgl_coord_t height;
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nxgl_coord_t swidth;
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nxgl_coord_t sstride;
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nxgl_coord_t dstride;
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nxgl_coord_t sshift;
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int shift;
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int row;
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int col;
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/* Handle the case some or all of the cursor image is off of the display. */
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nxgl_rectintersect(&intersection, &be->cursor.bounds, &be->bkgd.bounds);
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/* Check if there is anything in the modified region that we need to handle. */
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nxgl_rectintersect(&intersection, &intersection, bounds);
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if (!nxgl_nullrect(&intersection))
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{
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/* Get the width and the height of the images to copy in pixels/rows */
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width = intersection.pt2.x - intersection.pt1.x + 1;
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height = intersection.pt2.y - intersection.pt1.y + 1;
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/* Get the width of the images in bytes. */
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swidth = be->cursor.bounds.pt2.x - be->cursor.bounds.pt1.x + 1;
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sstride = (swidth + 3) >> 2; /* 2 bits per pixel, 4 pixels per byte */
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plane = &be->plane[planeno];
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dstride = plane->pinfo.stride;
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/* Get the origin position in the cursor image */
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nxgl_vectsubtract(&origin, &intersection.pt1, &be->cursor.bounds.pt1);
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/* Update any cursor graphics on top of the device display to include
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* the modified cursor.
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*
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* REVISIT: This will only work for a single plane and for bits per
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* pixel greater than or equal to 8.
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*/
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fbmem = (FAR uint8_t *)plane->pinfo.fbmem;
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sline = be->cursor.image + sstride * origin.y + (origin.x >> 2);
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dline = (FAR uint8_t *)fbmem + dstride * intersection.pt1.y +
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NXGL_SCALEX(intersection.pt1.x);
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sshift = (3 - (origin.y & 3)) << 1; /* MS first {0, 2, 4, 6} */
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/* Loop for each row */
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for (row = 0; row < height; row++)
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{
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/* Reset to the beginning of the line */
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src = sline;
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dest = (FAR NXGL_PIXEL_T *)dline;
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shift = sshift;
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/* Loop for each column */
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for (col = 0; col < width; col++)
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{
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/* Extract the 2-bit pixel. Data is always packed MS first.
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* Shift for first pixel=6, shift for last pixel=0
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*/
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uint8_t pixel = (*src >> shift) & 3;
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/* Skip over invisible pixels */
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if (pixel != 0)
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{
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*dest = nxbe_map_color(be, 0, pixel);
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}
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dest++;
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/* Was that the last pixel in the byte? */
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if (shift == 0)
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{
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/* Update source column addresses and reset the shift
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* value
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*/
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src++;
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shift = 6;
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}
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else
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{
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/* The shift value is one of {2, 4, 6}. Update the shift
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* value following this order: 6, 4, 2, 0
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*/
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shift = (shift - 2) & 6;
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}
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}
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/* Update the row addresses to the next row */
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sline += sstride;
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dline += dstride;
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}
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}
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}
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#endif /* CONFIG_NX_SWCURSOR */
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