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/*
* $Id$
*
* Copyright © 2004 Keith Packard
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
#include "twinint.h"
twin_pixmap_t *
twin_pixmap_create (twin_format_t format, int width, int height)
{
int stride = twin_bytes_per_pixel (format) * width;
int size = sizeof (twin_pixmap_t) + stride * height;
twin_pixmap_t *pixmap = malloc (size);
if (!pixmap)
return 0;
pixmap->screen = 0;
pixmap->higher = 0;
pixmap->x = pixmap->y = 0;
pixmap->format = format;
pixmap->width = width;
pixmap->height = height;
pixmap->stride = stride;
pixmap->p.v = pixmap + 1;
return pixmap;
}
void
twin_pixmap_destroy (twin_pixmap_t *pixmap)
{
if (pixmap->screen)
twin_pixmap_hide (pixmap);
free (pixmap);
}
void
twin_pixmap_show (twin_pixmap_t *pixmap,
twin_screen_t *screen,
twin_pixmap_t *lower)
{
twin_pixmap_t **higherp;
if (pixmap->screen)
twin_pixmap_hide (pixmap);
pixmap->screen = screen;
if (lower)
higherp = &lower->higher;
else
higherp = &screen->bottom;
pixmap->higher = *higherp;
*higherp = pixmap;
twin_pixmap_damage (pixmap, 0, 0, pixmap->width, pixmap->height);
}
void
twin_pixmap_hide (twin_pixmap_t *pixmap)
{
twin_screen_t *screen = pixmap->screen;
twin_pixmap_t **higherp;
if (!screen)
return;
twin_pixmap_damage (pixmap, 0, 0, pixmap->width, pixmap->height);
for (higherp = &screen->bottom; *higherp != pixmap; higherp = &(*higherp)->higher)
;
*higherp = pixmap->higher;
pixmap->screen = 0;
pixmap->higher = 0;
}
twin_pointer_t
twin_pixmap_pointer (twin_pixmap_t *pixmap, int x, int y)
{
twin_pointer_t p;
p.b = (pixmap->p.b +
y * pixmap->stride +
x * twin_bytes_per_pixel(pixmap->format));
return p;
}
void
twin_pixmap_damage (twin_pixmap_t *pixmap,
int x1, int y1, int x2, int y2)
{
if (pixmap->screen)
twin_screen_damage (pixmap->screen,
x1 + pixmap->x,
y1 + pixmap->y,
x2 + pixmap->x,
y2 + pixmap->y);
}
void
twin_pixmap_move (twin_pixmap_t *pixmap, int x, int y)
{
twin_pixmap_damage (pixmap, 0, 0, pixmap->width, pixmap->height);
pixmap->x = x;
pixmap->y = y;
twin_pixmap_damage (pixmap, 0, 0, pixmap->width, pixmap->height);
}
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