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/* vim: set ts=8 sw=8 noexpandtab: */
/* The `C' CSS Library.
* Copyright (C) 2008 Robert Staudinger
*
* 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 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, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include <glib.h>
#include "ccss-position-parser.h"
#include "config.h"
static const struct {
char const *name;
ccss_position_type_t type;
const double percentage;
} _position_map[] = {
{ "left", CCSS_POSITION_LEFT, 0 },
{ "top", CCSS_POSITION_TOP, 0 },
{ "right", CCSS_POSITION_RIGHT, 100 },
{ "bottom", CCSS_POSITION_BOTTOM, 100 },
{ "center", CCSS_POSITION_CENTER, 50 },
{ "auto", CCSS_POSITION_AUTO, -1 },
{ "contain", CCSS_POSITION_CONTAIN, -1 },
{ "cover", CCSS_POSITION_COVER, -1 }
};
bool
ccss_position_parse (ccss_position_t *self,
uint32_t flags,
CRTerm const **values)
{
char const *name;
if (!*values) {
return false;
}
switch ((*values)->type) {
case TERM_IDENT:
name = (char const *) cr_string_peek_raw_str ((*values)->content.str);
for (unsigned int i = 0; i < G_N_ELEMENTS (_position_map); i++) {
if (_position_map[i].type & flags &&
0 == g_strcmp0 (_position_map[i].name, name)) {
if (_position_map[i].percentage > -1) {
self->type = CCSS_POSITION_PERCENTAGE;
self->value = _position_map[i].percentage;
} else {
self->type = _position_map[i].type;
self->value = -1;
}
*values = (*values)->next;
return true;
}
}
break;
case TERM_NUMBER:
if (CCSS_POSITION_PERCENTAGE & flags &&
NUM_PERCENTAGE == (*values)->content.num->type) {
self->type = CCSS_POSITION_PERCENTAGE;
self->value = (*values)->content.num->val;
*values = (*values)->next;
return true;
} else if (CCSS_POSITION_LENGTH & flags &&
NUM_GENERIC == (*values)->content.num->type) {
self->type = CCSS_POSITION_LENGTH;
self->value = (*values)->content.num->val;
*values = (*values)->next;
return true;
} else {
return false;
}
break;
default:
g_assert_not_reached ();
/* Need some code here when building w/o assertions. */
return false;
}
return false;
}
double
ccss_position_get_pos (ccss_position_t const *self,
double extent,
double size)
{
switch (self->type) {
case CCSS_POSITION_LENGTH:
return self->value;
case CCSS_POSITION_PERCENTAGE:
return self->value / 100. * (extent - size);
case CCSS_POSITION_CONTAIN:
case CCSS_POSITION_COVER:
case CCSS_POSITION_AUTO:
default:
g_assert_not_reached ();
/* Need some code here when building w/o assertions. */
return 0;
}
return 0;
}
double
ccss_position_get_size (ccss_position_t const *self,
double extent)
{
switch (self->type) {
case CCSS_POSITION_LENGTH:
return self->value;
case CCSS_POSITION_PERCENTAGE:
return self->value / 100. * extent;
case CCSS_POSITION_CONTAIN:
case CCSS_POSITION_COVER:
case CCSS_POSITION_AUTO:
default:
g_assert_not_reached ();
/* Need some code here when building w/o assertions. */
return 0;
}
return 0;
}
static void
contain (double extent_x,
double extent_y,
double width,
double height,
double *x,
double *y)
{
/* Try to use full width. */
*y = extent_x * height / width;
if (*y <= extent_y) {
*x = extent_x;
return;
}
/* Use full height. */
*x = extent_y * width / height;
*y = extent_y;
}
static void
cover (double extent_x,
double extent_y,
double width,
double height,
double *x,
double *y)
{
/* Try to use full width. */
*y = extent_x * height / width;
if (*y >= extent_y) {
*x = extent_x;
return;
}
/* Use full height. */
*x = extent_y * width / height;
*y = extent_y;
}
double
ccss_position_get_hsize (ccss_position_t const *self,
double extent_x,
double extent_y,
double width,
double height)
{
double x;
double y;
switch (self->type) {
case CCSS_POSITION_LENGTH:
return self->value;
case CCSS_POSITION_PERCENTAGE:
return self->value * extent_x / 100.;
case CCSS_POSITION_CONTAIN:
contain (extent_x, extent_y, width, height, &x, &y);
return x;
case CCSS_POSITION_COVER:
cover (extent_x, extent_y, width, height, &x, &y);
return x;
case CCSS_POSITION_AUTO:
return width;
default:
g_assert_not_reached ();
/* Need some code here when building w/o assertions. */
return 0;
}
return 0;
}
double
ccss_position_get_vsize (ccss_position_t const *self,
double extent_x,
double extent_y,
double width,
double height)
{
double x;
double y;
switch (self->type) {
case CCSS_POSITION_LENGTH:
return self->value;
case CCSS_POSITION_PERCENTAGE:
return self->value * extent_y / 100.;
case CCSS_POSITION_CONTAIN:
contain (extent_x, extent_y, width, height, &x, &y);
return y;
case CCSS_POSITION_COVER:
cover (extent_x, extent_y, width, height, &x, &y);
return y;
case CCSS_POSITION_AUTO:
return height;
default:
g_assert_not_reached ();
/* Need some code here when building w/o assertions. */
return 0;
}
return 0;
}
char *
ccss_position_serialize (ccss_position_t const *self)
{
g_return_val_if_fail (self, NULL);
switch (self->type) {
case CCSS_POSITION_LENGTH:
return g_strdup_printf ("%.3f", self->value);
case CCSS_POSITION_PERCENTAGE:
return g_strdup_printf ("%.3fpx", self->value);
case CCSS_POSITION_LEFT:
return g_strdup ("left");
case CCSS_POSITION_TOP:
return g_strdup ("top");
case CCSS_POSITION_RIGHT:
return g_strdup ("right");
case CCSS_POSITION_BOTTOM:
return g_strdup ("bottom");
case CCSS_POSITION_CENTER:
return g_strdup ("center");
case CCSS_POSITION_AUTO:
return g_strdup ("auto");
case CCSS_POSITION_CONTAIN:
return g_strdup ("containe");
case CCSS_POSITION_COVER:
return g_strdup ("cover");
case CCSS_POSITION_MASK_NUMERIC:
case CCSS_POSITION_MASK_HORIZONTAL:
case CCSS_POSITION_MASK_VERTICAL:
case CCSS_POSITION_MASK_AUTO:
/* Fall thru. */
break;
}
return NULL;
}
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