gtk2/gtk/gtkrenderbackground.c

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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 "gtkrenderbackgroundprivate.h"
#include "gtkcssarrayvalueprivate.h"
#include "gtkcssbgsizevalueprivate.h"
#include "gtkcssboxesprivate.h"
#include "gtkcsscornervalueprivate.h"
#include "gtkcssenumvalueprivate.h"
#include "gtkcssimagevalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssshadowvalueprivate.h"
#include "gtkcsspositionvalueprivate.h"
#include "gtkcssrepeatvalueprivate.h"
#include "gtkcsscolorvalueprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkcsstypesprivate.h"
#include <math.h>
#include <gdk/gdk.h>
#include "gsk/gskroundedrectprivate.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"
static void
gtk_theming_background_snapshot_color (GtkCssBoxes *boxes,
GtkSnapshot *snapshot,
const GdkRGBA *bg_color,
const GtkCssValue *background_image)
{
const GskRoundedRect *box;
gint n_values;
GtkCssArea clip;
n_values = _gtk_css_array_value_get_n_values (background_image);
clip = _gtk_css_area_value_get
(_gtk_css_array_value_get_nth
(gtk_css_style_get_value (boxes->style, GTK_CSS_PROPERTY_BACKGROUND_CLIP),
n_values - 1));
box = gtk_css_boxes_get_box (boxes, clip);
if (gsk_rounded_rect_is_rectilinear (box))
{
gtk_snapshot_append_color (snapshot,
bg_color,
&box->bounds);
}
else
{
gtk_snapshot_push_rounded_clip (snapshot, box);
gtk_snapshot_append_color (snapshot,
bg_color,
&box->bounds);
gtk_snapshot_pop (snapshot);
}
}
static void
gtk_theming_background_snapshot_layer (GtkCssBoxes *bg,
guint idx,
GtkSnapshot *snapshot)
{
GtkCssRepeatStyle hrepeat, vrepeat;
const GtkCssValue *pos, *repeat;
GtkCssImage *image;
const GskRoundedRect *origin, *clip;
double image_width, image_height;
double width, height;
double x, y;
image = _gtk_css_image_value_get_image (
_gtk_css_array_value_get_nth (
gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_IMAGE),
idx));
if (image == NULL)
return;
pos = _gtk_css_array_value_get_nth (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_POSITION), idx);
repeat = _gtk_css_array_value_get_nth (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_REPEAT), idx);
hrepeat = _gtk_css_background_repeat_value_get_x (repeat);
vrepeat = _gtk_css_background_repeat_value_get_y (repeat);
origin = gtk_css_boxes_get_box (bg,
_gtk_css_area_value_get (
_gtk_css_array_value_get_nth (
gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_ORIGIN),
idx)));
width = origin->bounds.size.width;
height = origin->bounds.size.height;
if (width <= 0 || height <= 0)
return;
clip = gtk_css_boxes_get_box (bg,
_gtk_css_area_value_get (
_gtk_css_array_value_get_nth (
gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_CLIP),
idx)));
_gtk_css_bg_size_value_compute_size (_gtk_css_array_value_get_nth (gtk_css_style_get_value (bg->style, GTK_CSS_PROPERTY_BACKGROUND_SIZE), idx),
image,
width,
height,
&image_width,
&image_height);
if (image_width <= 0 || image_height <= 0)
return;
/* optimization */
if (image_width == width)
hrepeat = GTK_CSS_REPEAT_STYLE_NO_REPEAT;
if (image_height == height)
vrepeat = GTK_CSS_REPEAT_STYLE_NO_REPEAT;
gtk_snapshot_push_debug (snapshot, "Layer %u", idx);
gtk_snapshot_push_rounded_clip (snapshot, clip);
x = _gtk_css_position_value_get_x (pos, width - image_width) + origin->bounds.origin.x;
y = _gtk_css_position_value_get_y (pos, height - image_height) + origin->bounds.origin.y;
if (hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT && vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
{
/* shortcut for normal case */
if (x != 0 || y != 0)
{
gtk_snapshot_save (snapshot);
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (x, y));
gtk_css_image_snapshot (image, snapshot, image_width, image_height);
gtk_snapshot_restore (snapshot);
}
else
{
gtk_css_image_snapshot (image, snapshot, image_width, image_height);
}
}
else
{
float repeat_width, repeat_height;
graphene_rect_t fill_rect;
/* If background-repeat is round for one (or both) dimensions,
* there is a second step. The UA must scale the image in that
* dimension (or both dimensions) so that it fits a whole number of
* times in the background positioning area. In the case of the width
* (height is analogous):
*
* If X ≠ 0 is the width of the image after step one and W is the width
* of the background positioning area, then the rounded width
* X' = W / round(W / X) where round() is a function that returns the
* nearest natural number (integer greater than zero).
*
* If background-repeat is round for one dimension only and if
* background-size is auto for the other dimension, then there is
* a third step: that other dimension is scaled so that the original
* aspect ratio is restored.
*/
if (hrepeat == GTK_CSS_REPEAT_STYLE_ROUND)
{
double n = round (width / image_width);
n = MAX (1, n);
if (vrepeat != GTK_CSS_REPEAT_STYLE_ROUND
/* && vsize == auto (it is by default) */)
image_height *= width / (image_width * n);
image_width = width / n;
}
if (vrepeat == GTK_CSS_REPEAT_STYLE_ROUND)
{
double n = round (height / image_height);
n = MAX (1, n);
if (hrepeat != GTK_CSS_REPEAT_STYLE_ROUND
/* && hsize == auto (it is by default) */)
image_width *= height / (image_height * n);
image_height = height / n;
}
/* if hrepeat or vrepeat is 'space', we create a somewhat larger surface
* to store the extra space. */
if (hrepeat == GTK_CSS_REPEAT_STYLE_SPACE)
{
double n = floor (width / image_width);
repeat_width = n ? round (width / n) : 0;
}
else
repeat_width = round (image_width);
if (vrepeat == GTK_CSS_REPEAT_STYLE_SPACE)
{
double n = floor (height / image_height);
repeat_height = n ? round (height / n) : 0;
}
else
repeat_height = round (image_height);
if (hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
{
fill_rect.origin.x = _gtk_css_position_value_get_x (pos, width - image_width);
fill_rect.size.width = image_width;
}
else
{
fill_rect.origin.x = 0;
fill_rect.size.width = width;
}
if (vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
{
fill_rect.origin.y = _gtk_css_position_value_get_y (pos, height - image_height);
fill_rect.size.height = image_height;
}
else
{
fill_rect.origin.y = 0;
fill_rect.size.height = height;
}
gtk_snapshot_push_repeat (snapshot,
&fill_rect,
&GRAPHENE_RECT_INIT (
x, y,
repeat_width, repeat_height
));
gtk_snapshot_translate (snapshot, &GRAPHENE_POINT_INIT (
x + 0.5 * (repeat_width - image_width),
y + 0.5 * (repeat_height - image_height)));
gtk_css_image_snapshot (image, snapshot, image_width, image_height);
gtk_snapshot_pop (snapshot);
}
gtk_snapshot_pop (snapshot);
gtk_snapshot_pop (snapshot);
}
void
gtk_css_style_snapshot_background (GtkCssBoxes *boxes,
GtkSnapshot *snapshot)
{
GtkCssValue *background_image = gtk_css_style_get_value (boxes->style, GTK_CSS_PROPERTY_BACKGROUND_IMAGE);
const GdkRGBA *bg_color = gtk_css_color_value_get_rgba (gtk_css_style_get_value (boxes->style, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
const GtkCssValue *box_shadow = gtk_css_style_get_value (boxes->style, GTK_CSS_PROPERTY_BOX_SHADOW);
const gboolean has_bg_color = !gdk_rgba_is_clear (bg_color);
const gboolean has_bg_image = _gtk_css_image_value_get_image (_gtk_css_array_value_get_nth (background_image, 0)) != NULL;
const gboolean has_shadow = !gtk_css_shadow_value_is_none (box_shadow);
gint idx;
/* This is the common default case of no background */
if (!has_bg_color && !has_bg_image && !has_shadow)
return;
gtk_snapshot_push_debug (snapshot, "CSS background");
if (has_shadow)
gtk_css_shadow_value_snapshot_outset (box_shadow,
snapshot,
gtk_css_boxes_get_border_box (boxes));
if (has_bg_image)
{
GtkCssValue *blend_modes = gtk_css_style_get_value (boxes->style, GTK_CSS_PROPERTY_BACKGROUND_BLEND_MODE);
const int number_of_layers = _gtk_css_array_value_get_n_values (background_image);
GskBlendMode *blend_mode_values = g_alloca (sizeof (GskBlendMode) * number_of_layers);
for (idx = number_of_layers - 1; idx >= 0; idx--)
{
blend_mode_values[idx] = _gtk_css_blend_mode_value_get (_gtk_css_array_value_get_nth (blend_modes, idx));
if (blend_mode_values[idx] != GSK_BLEND_MODE_DEFAULT)
gtk_snapshot_push_blend (snapshot, blend_mode_values[idx]);
}
if (has_bg_color)
gtk_theming_background_snapshot_color (boxes, snapshot, bg_color, background_image);
for (idx = number_of_layers - 1; idx >= 0; idx--)
{
if (blend_mode_values[idx] == GSK_BLEND_MODE_DEFAULT)
{
gtk_theming_background_snapshot_layer (boxes, idx, snapshot);
}
else
{
gtk_snapshot_pop (snapshot);
gtk_theming_background_snapshot_layer (boxes, idx, snapshot);
gtk_snapshot_pop (snapshot);
}
}
}
else if (has_bg_color)
{
gtk_theming_background_snapshot_color (boxes, snapshot, bg_color, background_image);
}
if (has_shadow)
gtk_css_shadow_value_snapshot_inset (box_shadow,
snapshot,
gtk_css_boxes_get_padding_box (boxes));
gtk_snapshot_pop (snapshot);
}