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/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2010 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "spice-widget.h"
#include "spice-widget-priv.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
G_GNUC_INTERNAL
int spicex_image_create(SpiceDisplay *display)
{
spice_display *d = SPICE_DISPLAY_GET_PRIVATE(display);
if (d->format == SPICE_SURFACE_FMT_16_555 ||
d->format == SPICE_SURFACE_FMT_16_565) {
d->convert = TRUE;
d->data = g_malloc0(d->height * d->stride); /* pixels are 32 bits */
} else {
d->convert = FALSE;
}
d->ximage = cairo_image_surface_create_for_data
(d->data, CAIRO_FORMAT_RGB24, d->width, d->height, d->stride);
return 0;
}
G_GNUC_INTERNAL
void spicex_image_destroy(SpiceDisplay *display)
{
spice_display *d = SPICE_DISPLAY_GET_PRIVATE(display);
if (d->ximage_cache) {
cairo_surface_finish(d->ximage_cache);
d->ximage_cache = NULL;
}
if (d->ximage) {
cairo_surface_finish(d->ximage);
d->ximage = NULL;
}
if (d->convert && d->data) {
g_free(d->data);
d->data = NULL;
}
}
static void setup_surface_cache(spice_display *d, cairo_t *crWin)
{
cairo_surface_t *win = cairo_get_target(crWin);
cairo_t *crCache;
if (d->ximage_cache)
return;
g_return_if_fail(d->ximage);
/* Creates a Pixmap on the X11 server matching the Window */
d->ximage_cache = cairo_surface_create_similar(win,
CAIRO_CONTENT_COLOR,
d->width, d->height);
crCache = cairo_create(d->ximage_cache);
/* Copy our local framebuffer contents to the Pixmap */
cairo_set_source_surface(crCache, d->ximage, 0, 0);
cairo_paint(crCache);
cairo_destroy(crCache);
}
static gboolean draw_event(SpiceDisplay *display, cairo_t *cr)
{
spice_display *d = SPICE_DISPLAY_GET_PRIVATE(display);
int fbw = d->width, fbh = d->height;
int mx = 0, my = 0;
int ww, wh;
if (!d->ximage_cache) {
setup_surface_cache(d, cr);
}
gdk_drawable_get_size(gtk_widget_get_window(GTK_WIDGET(display)), &ww, &wh);
if (ww > fbw)
mx = (ww - fbw) / 2;
if (wh > fbh)
my = (wh - fbh) / 2;
/* If we don't have a pixmap, or we're not scaling, then
we need to fill with background color */
if (!d->ximage ||
!d->allow_scaling) {
cairo_rectangle(cr, 0, 0, ww, wh);
/* Optionally cut out the inner area where the pixmap
will be drawn. This avoids 'flashing' since we're
not double-buffering. Note we're using the undocumented
behaviour of drawing the rectangle from right to left
to cut out the whole */
if (d->ximage)
cairo_rectangle(cr, mx + fbw, my,
-1 * fbw, fbh);
cairo_fill(cr);
}
/* Draw the display */
if (d->ximage) {
if (d->allow_scaling) {
double sx, sy;
/* Scale to fill window */
sx = (double)ww / (double)fbw;
sy = (double)wh / (double)fbh;
cairo_scale(cr, sx, sy);
cairo_set_source_surface(cr, d->ximage_cache, 0, 0);
} else {
cairo_set_source_surface(cr, d->ximage_cache, mx, my);
}
cairo_paint(cr);
}
return TRUE;
}
G_GNUC_INTERNAL
void spicex_expose_event(SpiceDisplay *display, GdkEventExpose *expose)
{
cairo_t *cr;
gboolean ret;
cr = gdk_cairo_create(gtk_widget_get_window(GTK_WIDGET(display)));
cairo_rectangle(cr,
expose->area.x,
expose->area.y,
expose->area.width,
expose->area.height);
cairo_clip(cr);
ret = draw_event(display, cr);
cairo_destroy(cr);
}
G_GNUC_INTERNAL
void spicex_image_invalidate(SpiceDisplay *display,
gint *x, gint *y, gint *w, gint *h)
{
spice_display *d = SPICE_DISPLAY_GET_PRIVATE(display);
int ww, wh;
gdk_drawable_get_size(gtk_widget_get_window(GTK_WIDGET(display)), &ww, &wh);
/* If we have a pixmap, update the region which changed.
* If we don't have a pixmap, the entire thing will be
* created & rendered during the drawing handler
*/
if (d->ximage_cache) {
cairo_t *cr = cairo_create(d->ximage_cache);
cairo_rectangle(cr, *x, *y, *w, *h);
cairo_clip(cr);
cairo_set_source_surface(cr, d->ximage, 0, 0);
cairo_paint(cr);
cairo_destroy(cr);
}
if (d->allow_scaling) {
double sx, sy;
/* Scale the exposed region */
sx = (double)ww / (double)d->width;
sy = (double)wh / (double)d->height;
*x *= sx;
*y *= sy;
*w *= sx;
*h *= sy;
/* FIXME: same hack as gtk-vnc */
/* Without this, we get horizontal & vertical line artifacts
* when drawing. This "fix" is somewhat dubious though. The
* true mistake & fix almost certainly lies elsewhere.
*/
*x -= 2;
*y -= 2;
*w += 4;
*h += 4;
} else {
/* Offset the Spice region to produce expose region */
*x += d->mx;
*y += d->my;
}
}
G_GNUC_INTERNAL
gboolean spicex_is_scaled(SpiceDisplay *display)
{
spice_display *d = SPICE_DISPLAY_GET_PRIVATE(display);
return d->allow_scaling;
}
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