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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_screen_t *
twin_screen_create (twin_coord_t width,
twin_coord_t height,
twin_put_begin_t put_begin,
twin_put_span_t put_span,
void *closure)
{
twin_screen_t *screen = malloc (sizeof (twin_screen_t));
if (!screen)
return 0;
screen->bottom = 0;
screen->width = width;
screen->height = height;
screen->damage.left = screen->damage.right = 0;
screen->damage.top = screen->damage.bottom = 0;
screen->damaged = NULL;
screen->damaged_closure = NULL;
screen->disable = 0;
#if HAVE_PTHREAD_H
pthread_mutex_init (&screen->screen_mutex, NULL);
#endif
screen->put_begin = put_begin;
screen->put_span = put_span;
screen->closure = closure;
return screen;
}
void
twin_screen_lock (twin_screen_t *screen)
{
#if HAVE_PTHREAD_H
pthread_mutex_lock (&screen->screen_mutex);
#endif
}
void
twin_screen_unlock (twin_screen_t *screen)
{
#if HAVE_PTHREAD_H
pthread_mutex_unlock (&screen->screen_mutex);
#endif
}
void
twin_screen_destroy (twin_screen_t *screen)
{
while (screen->bottom)
twin_pixmap_hide (screen->bottom);
free (screen);
}
void
twin_screen_register_damaged (twin_screen_t *screen,
void (*damaged) (void *),
void *closure)
{
screen->damaged = damaged;
screen->damaged_closure = closure;
}
void
twin_screen_enable_update (twin_screen_t *screen)
{
if (--screen->disable == 0)
{
if (screen->damage.left < screen->damage.right &&
screen->damage.top < screen->damage.bottom)
{
if (screen->damaged)
(*screen->damaged) (screen->damaged_closure);
}
}
}
void
twin_screen_disable_update (twin_screen_t *screen)
{
screen->disable++;
}
void
twin_screen_damage (twin_screen_t *screen,
twin_coord_t left, twin_coord_t top,
twin_coord_t right, twin_coord_t bottom)
{
if (screen->damage.left == screen->damage.right)
{
screen->damage.left = left;
screen->damage.right = right;
screen->damage.top = top;
screen->damage.bottom = bottom;
}
else
{
if (left < screen->damage.left)
screen->damage.left = left;
if (top < screen->damage.top)
screen->damage.top = top;
if (screen->damage.right < right)
screen->damage.right = right;
if (screen->damage.bottom < bottom)
screen->damage.bottom = bottom;
}
if (screen->damaged && !screen->disable)
(*screen->damaged) (screen->damaged_closure);
}
void
twin_screen_resize (twin_screen_t *screen,
twin_coord_t width, twin_coord_t height)
{
screen->width = width;
screen->height = height;
twin_screen_damage (screen, 0, 0, screen->width, screen->height);
}
twin_bool_t
twin_screen_damaged (twin_screen_t *screen)
{
return (screen->damage.left < screen->damage.right &&
screen->damage.top < screen->damage.bottom);
}
void
twin_screen_update (twin_screen_t *screen)
{
if (!screen->disable &&
screen->damage.left < screen->damage.right &&
screen->damage.top < screen->damage.bottom)
{
twin_coord_t x = screen->damage.left;
twin_coord_t y = screen->damage.top;
twin_coord_t width = screen->damage.right - screen->damage.left;
twin_coord_t height = screen->damage.bottom - screen->damage.top;
twin_argb32_t *span;
twin_pixmap_t *p;
/* XXX what is the maximum number of lines? */
span = malloc (width * sizeof (twin_argb32_t));
if (!span)
return;
if (screen->put_begin)
(*screen->put_begin) (x, y, width, height, screen->closure);
while (height--)
{
memset (span, 0xff, width * sizeof (twin_argb32_t));
for (p = screen->bottom; p; p = p->higher)
{
twin_pointer_t dst;
twin_source_u src;
int left, right;
/* bounds check in y */
if (y < p->y)
continue;
if (p->y + p->height <= y)
continue;
/* bounds check in x*/
left = x;
if (left < p->x)
left = p->x;
right = x + width;
if (right > p->x + p->width)
right = p->x + p->width;
if (left >= right)
continue;
dst.argb32 = span + (left - x);
src.p = twin_pixmap_pointer (p, left - p->x, y - p->y);
if (p->format == TWIN_RGB16)
_twin_rgb16_source_argb32 (dst, src, right - left);
else
_twin_argb32_over_argb32 (dst, src, right - left);
}
(*screen->put_span) (x, y, width, span, screen->closure);
y++;
}
free (span);
screen->damage.left = screen->damage.right = 0;
screen->damage.top = screen->damage.bottom = 0;
}
}
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