mirror of
https://github.com/morgan9e/grd
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126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/*
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* Copyright (C) 2018 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*
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*/
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#include "config.h"
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#include "grd-vnc-cursor.h"
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#include <glib.h>
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#include <stdint.h>
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static void
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get_pixel_components (uint32_t pixel,
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GrdPixelFormat format,
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uint8_t *a,
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uint8_t *r,
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uint8_t *g,
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uint8_t *b)
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{
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g_assert (format == GRD_PIXEL_FORMAT_RGBA8888);
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*a = (pixel & 0xff000000) >> 24;
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*b = (pixel & 0xff0000) >> 16;
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*g = (pixel & 0xff00) >> 8;
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*r = pixel & 0xff;
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}
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static gboolean
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is_practically_black (uint8_t r,
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uint8_t g,
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uint8_t b)
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{
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if (r <= 0x62 &&
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g <= 0x62 &&
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b <= 0x62)
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return TRUE;
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else
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return FALSE;
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}
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static gboolean
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is_practically_opaque (uint8_t a)
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{
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return a > 0xe0;
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}
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rfbCursorPtr
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grd_vnc_create_cursor (int width,
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int height,
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int stride,
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GrdPixelFormat format,
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uint8_t *buf)
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{
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g_autofree char *cursor = NULL;
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g_autofree char *mask = NULL;
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int y;
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g_return_val_if_fail (format == GRD_PIXEL_FORMAT_RGBA8888, NULL);
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cursor = g_new0 (char, width * height);
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mask = g_new0 (char, width * height);
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for (y = 0; y < height; y++)
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{
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uint32_t *pixel_row;
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int x;
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pixel_row = (uint32_t *) &buf[y * stride];
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for (x = 0; x < width; x++)
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{
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uint32_t pixel = pixel_row[x];
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uint8_t a, r, g, b;
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get_pixel_components (pixel,
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format,
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&a, &r, &g, &b);
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if (is_practically_opaque (a))
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{
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if (is_practically_black (r, g, b))
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cursor[y * width + x] = ' ';
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else
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cursor[y * width + x] = 'x';
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mask[y * width + x] = 'x';
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}
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else
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{
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cursor[y * width + x] = ' ';
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mask[y * width + x] = ' ';
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}
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}
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}
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return rfbMakeXCursor (width, height, cursor, mask);
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}
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rfbCursorPtr
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grd_vnc_create_empty_cursor (int width,
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int height)
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{
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g_autofree char *cursor = NULL;
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cursor = g_new0 (char, width * height);
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memset (cursor, ' ', width * height);
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return rfbMakeXCursor (width, height, cursor, cursor);
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}
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