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gtk2/gtk/gtkborderimage.c
Benjamin Otte 8c49cd97a7 cssvalue: Add a cssvalue for images
2012-04-17 08:59:14 +02:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
* Copyright (C) 2011 Red Hat, Inc.
*
* Authors: Carlos Garnacho <carlosg@gnome.org>
* Cosimo Cecchi <cosimoc@gnome.org>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <cairo-gobject.h>
#include <math.h>
#include "gtkborderimageprivate.h"
#include "gtkcssimagevalueprivate.h"
#include "gtkstylepropertiesprivate.h"
#include "gtkthemingengineprivate.h"
/* this is in case round() is not provided by the compiler,
* such as in the case of C89 compilers, like MSVC
*/
#include "fallback-c89.c"
gboolean
_gtk_border_image_init (GtkBorderImage *image,
GtkThemingEngine *engine)
{
GtkBorder *width;
image->source = _gtk_css_image_value_get_image (_gtk_theming_engine_peek_property (engine, "border-image-source"));
if (image->source == NULL)
return FALSE;
image->slice = *(GtkBorder *) _gtk_css_value_get_boxed (_gtk_theming_engine_peek_property (engine, "border-image-slice"));
width = _gtk_css_value_get_boxed (_gtk_theming_engine_peek_property (engine, "border-image-width"));
if (width)
{
image->width = *width;
image->has_width = TRUE;
}
else
image->has_width = FALSE;
image->repeat = *_gtk_css_value_get_border_image_repeat (_gtk_theming_engine_peek_property (engine, "border-image-repeat"));
return TRUE;
}
typedef struct _GtkBorderImageSliceSize GtkBorderImageSliceSize;
struct _GtkBorderImageSliceSize {
double offset;
double size;
};
static void
gtk_border_image_compute_border_size (GtkBorderImageSliceSize sizes[3],
double offset,
double area_size,
int start_border,
int end_border)
{
/* This code assumes area_size >= start_border + end_border */
sizes[0].offset = offset;
sizes[0].size = start_border;
sizes[1].offset = offset + start_border;
sizes[1].size = area_size - start_border - end_border;
sizes[2].offset = offset + area_size - end_border;
sizes[2].size = end_border;
}
static void
gtk_border_image_render_slice (cairo_t *cr,
cairo_surface_t *slice,
double slice_width,
double slice_height,
double x,
double y,
double width,
double height,
GtkCssBorderRepeatStyle hrepeat,
GtkCssBorderRepeatStyle vrepeat)
{
double hscale, vscale;
double xstep, ystep;
cairo_extend_t extend = CAIRO_EXTEND_PAD;
cairo_matrix_t matrix;
cairo_pattern_t *pattern;
/* We can't draw center tiles yet */
g_assert (hrepeat == GTK_CSS_REPEAT_STYLE_STRETCH || vrepeat == GTK_CSS_REPEAT_STYLE_STRETCH);
hscale = width / slice_width;
vscale = height / slice_height;
xstep = width;
ystep = height;
switch (hrepeat)
{
case GTK_CSS_REPEAT_STYLE_REPEAT:
extend = CAIRO_EXTEND_REPEAT;
hscale = vscale;
break;
case GTK_CSS_REPEAT_STYLE_SPACE:
{
double space, n;
extend = CAIRO_EXTEND_NONE;
hscale = vscale;
xstep = hscale * slice_width;
n = floor (width / xstep);
space = (width - n * xstep) / (n + 1);
xstep += space;
x += space;
width -= 2 * space;
}
break;
case GTK_CSS_REPEAT_STYLE_STRETCH:
break;
case GTK_CSS_REPEAT_STYLE_ROUND:
extend = CAIRO_EXTEND_REPEAT;
hscale = width / (slice_width * MAX (round (width / (slice_width * vscale)), 1));
break;
default:
g_assert_not_reached ();
break;
}
switch (vrepeat)
{
case GTK_CSS_REPEAT_STYLE_REPEAT:
extend = CAIRO_EXTEND_REPEAT;
vscale = hscale;
break;
case GTK_CSS_REPEAT_STYLE_SPACE:
{
double space, n;
extend = CAIRO_EXTEND_NONE;
vscale = hscale;
ystep = vscale * slice_height;
n = floor (height / ystep);
space = (height - n * ystep) / (n + 1);
ystep += space;
y += space;
height -= 2 * space;
}
break;
case GTK_CSS_REPEAT_STYLE_STRETCH:
break;
case GTK_CSS_REPEAT_STYLE_ROUND:
extend = CAIRO_EXTEND_REPEAT;
vscale = height / (slice_height * MAX (round (height / (slice_height * hscale)), 1));
break;
default:
g_assert_not_reached ();
break;
}
pattern = cairo_pattern_create_for_surface (slice);
cairo_matrix_init_translate (&matrix,
hrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? slice_width / 2 : 0,
vrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? slice_height / 2 : 0);
cairo_matrix_scale (&matrix, 1 / hscale, 1 / vscale);
cairo_matrix_translate (&matrix,
hrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? - width / 2 : 0,
vrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? - height / 2 : 0);
cairo_pattern_set_matrix (pattern, &matrix);
cairo_pattern_set_extend (pattern, extend);
cairo_save (cr);
cairo_translate (cr, x, y);
for (y = 0; y < height; y += ystep)
{
for (x = 0; x < width; x += xstep)
{
cairo_save (cr);
cairo_translate (cr, x, y);
cairo_set_source (cr, pattern);
cairo_rectangle (cr, 0, 0, xstep, ystep);
cairo_fill (cr);
cairo_restore (cr);
}
}
cairo_restore (cr);
cairo_pattern_destroy (pattern);
}
static void
gtk_border_image_compute_slice_size (GtkBorderImageSliceSize sizes[3],
int surface_size,
int start_size,
int end_size)
{
sizes[0].size = MIN (start_size, surface_size);
sizes[0].offset = 0;
sizes[2].size = MIN (end_size, surface_size);
sizes[2].offset = surface_size - sizes[2].size;
sizes[1].size = MAX (0, surface_size - sizes[0].size - sizes[2].size);
sizes[1].offset = sizes[0].size;
}
void
_gtk_border_image_render (GtkBorderImage *image,
GtkBorder *border_width,
cairo_t *cr,
gdouble x,
gdouble y,
gdouble width,
gdouble height)
{
cairo_surface_t *surface, *slice;
GtkBorderImageSliceSize vertical_slice[3], horizontal_slice[3];
GtkBorderImageSliceSize vertical_border[3], horizontal_border[3];
double source_width, source_height;
int h, v;
if (image->has_width)
border_width = &image->width;
_gtk_css_image_get_concrete_size (image->source,
0, 0,
width, height,
&source_width, &source_height);
/* XXX: Optimize for (source_width == width && source_height == height) */
surface = _gtk_css_image_get_surface (image->source,
cairo_get_target (cr),
source_width, source_height);
gtk_border_image_compute_slice_size (horizontal_slice,
source_width,
image->slice.left,
image->slice.right);
gtk_border_image_compute_slice_size (vertical_slice,
source_height,
image->slice.top,
image->slice.bottom);
gtk_border_image_compute_border_size (horizontal_border,
x,
width,
border_width->left,
border_width->right);
gtk_border_image_compute_border_size (vertical_border,
y,
height,
border_width->top,
border_width->bottom);
for (v = 0; v < 3; v++)
{
if (vertical_slice[v].size == 0 ||
vertical_border[v].size == 0)
continue;
for (h = 0; h < 3; h++)
{
if (horizontal_slice[h].size == 0 ||
horizontal_border[h].size == 0)
continue;
if (h == 1 && v == 1)
continue;
slice = cairo_surface_create_for_rectangle (surface,
horizontal_slice[h].offset,
vertical_slice[v].offset,
horizontal_slice[h].size,
vertical_slice[v].size);
gtk_border_image_render_slice (cr,
slice,
horizontal_slice[h].size,
vertical_slice[v].size,
horizontal_border[h].offset,
vertical_border[v].offset,
horizontal_border[h].size,
vertical_border[v].size,
h == 1 ? image->repeat.hrepeat : GTK_CSS_REPEAT_STYLE_STRETCH,
v == 1 ? image->repeat.vrepeat : GTK_CSS_REPEAT_STYLE_STRETCH);
cairo_surface_destroy (slice);
}
}
cairo_surface_destroy (surface);
}
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