HelenOS sources

root/uspace/lib/posix/include/libc/io/pixelmap.h

INCLUDED FROM

DEFINITIONS

1. pixelmap_pixel_at
2. pixelmap_put_pixel
3. pixelmap_get_pixel

/*
 * Copyright (c) 2011 Petr Koupy
 * Copyright (c) 2014 Martin Sucha
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup libc
 * @{
 */
/**
 * @file
 */

#ifndef _LIBC_IO_PIXELMAP_H_
#define _LIBC_IO_PIXELMAP_H_

#include <types/common.h>
#include <stdbool.h>
#include <stddef.h>
#include <io/pixel.h>

typedef struct {
        sysarg_t width;
        sysarg_t height;
        pixel_t *data;
} pixelmap_t;

static inline pixel_t *pixelmap_pixel_at(
    pixelmap_t *pixelmap,
    sysarg_t x,
    sysarg_t y)
{
        if (x < pixelmap->width && y < pixelmap->height) {
                size_t offset = y * pixelmap->width + x;
                pixel_t *pixel = pixelmap->data + offset;
                return pixel;
        } else {
                return NULL;
        }
}

static inline void pixelmap_put_pixel(
    pixelmap_t *pixelmap,
    sysarg_t x,
    sysarg_t y,
    pixel_t pixel)
{
        pixel_t *target = pixelmap_pixel_at(pixelmap, x, y);
        if (target != NULL) {
                *target = pixel;
        }
}

static inline pixel_t pixelmap_get_pixel(
    pixelmap_t *pixelmap,
    sysarg_t x,
    sysarg_t y)
{
        pixel_t *source = pixelmap_pixel_at(pixelmap, x, y);
        if (source != NULL) {
                return *source;
        } else {
                return 0;
        }
}

#endif

/** @}
 */