299 lines
8.4 KiB
C
299 lines
8.4 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkcssbgsizevalueprivate.h"
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#include "gtkcssnumbervalueprivate.h"
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struct _GtkCssValue {
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GTK_CSS_VALUE_BASE
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guint cover :1;
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guint contain :1;
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GtkCssValue *x;
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GtkCssValue *y;
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};
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static void
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gtk_css_value_bg_size_free (GtkCssValue *value)
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{
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if (value->x)
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_gtk_css_value_unref (value->x);
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if (value->y)
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_gtk_css_value_unref (value->y);
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g_slice_free (GtkCssValue, value);
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}
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static GtkCssValue *
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gtk_css_value_bg_size_compute (GtkCssValue *value,
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guint property_id,
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GtkStyleProviderPrivate *provider,
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GtkCssStyle *style,
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GtkCssStyle *parent_style)
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{
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GtkCssValue *x, *y;
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if (value->x == NULL && value->y == NULL)
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return _gtk_css_value_ref (value);
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x = y = NULL;
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if (value->x)
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x = _gtk_css_value_compute (value->x, property_id, provider, style, parent_style);
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if (value->y)
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y = _gtk_css_value_compute (value->y, property_id, provider, style, parent_style);
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if (x == value->x && y == value->y)
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{
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if (x)
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_gtk_css_value_unref (x);
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if (y)
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_gtk_css_value_unref (y);
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return _gtk_css_value_ref (value);
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}
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return _gtk_css_bg_size_value_new (value->x ? x : NULL,
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value->y ? y : NULL);
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}
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static gboolean
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gtk_css_value_bg_size_equal (const GtkCssValue *value1,
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const GtkCssValue *value2)
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{
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return value1->cover == value2->cover &&
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value1->contain == value2->contain &&
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(value1->x == value2->x ||
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(value1->x != NULL && value2->x != NULL &&
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_gtk_css_value_equal (value1->x, value2->x))) &&
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(value1->y == value2->y ||
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(value1->y != NULL && value2->y != NULL &&
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_gtk_css_value_equal (value1->y, value2->y)));
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}
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static GtkCssValue *
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gtk_css_value_bg_size_transition (GtkCssValue *start,
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GtkCssValue *end,
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guint property_id,
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double progress)
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{
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GtkCssValue *x, *y;
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if (start->cover)
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return end->cover ? _gtk_css_value_ref (end) : NULL;
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if (start->contain)
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return end->contain ? _gtk_css_value_ref (end) : NULL;
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if ((start->x != NULL) ^ (end->x != NULL) ||
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(start->y != NULL) ^ (end->y != NULL))
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return NULL;
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if (start->x)
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{
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x = _gtk_css_value_transition (start->x, end->x, property_id, progress);
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if (x == NULL)
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return NULL;
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}
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else
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x = NULL;
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if (start->y)
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{
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y = _gtk_css_value_transition (start->y, end->y, property_id, progress);
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if (y == NULL)
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{
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_gtk_css_value_unref (x);
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return NULL;
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}
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}
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else
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y = NULL;
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return _gtk_css_bg_size_value_new (x, y);
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}
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static void
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gtk_css_value_bg_size_print (const GtkCssValue *value,
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GString *string)
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{
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if (value->cover)
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g_string_append (string, "cover");
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else if (value->contain)
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g_string_append (string, "contain");
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else
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{
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if (value->x == NULL)
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g_string_append (string, "auto");
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else
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_gtk_css_value_print (value->x, string);
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if (value->y)
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{
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g_string_append_c (string, ' ');
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_gtk_css_value_print (value->y, string);
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}
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}
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}
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static const GtkCssValueClass GTK_CSS_VALUE_BG_SIZE = {
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gtk_css_value_bg_size_free,
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gtk_css_value_bg_size_compute,
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gtk_css_value_bg_size_equal,
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gtk_css_value_bg_size_transition,
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gtk_css_value_bg_size_print
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};
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static GtkCssValue auto_singleton = { >K_CSS_VALUE_BG_SIZE, 1, FALSE, FALSE, NULL, NULL };
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static GtkCssValue cover_singleton = { >K_CSS_VALUE_BG_SIZE, 1, TRUE, FALSE, NULL, NULL };
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static GtkCssValue contain_singleton = { >K_CSS_VALUE_BG_SIZE, 1, FALSE, TRUE, NULL, NULL };
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GtkCssValue *
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_gtk_css_bg_size_value_new (GtkCssValue *x,
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GtkCssValue *y)
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{
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GtkCssValue *result;
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if (x == NULL && y == NULL)
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return _gtk_css_value_ref (&auto_singleton);
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result = _gtk_css_value_new (GtkCssValue, >K_CSS_VALUE_BG_SIZE);
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result->x = x;
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result->y = y;
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return result;
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}
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GtkCssValue *
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_gtk_css_bg_size_value_parse (GtkCssParser *parser)
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{
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GtkCssValue *x, *y;
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if (_gtk_css_parser_try (parser, "cover", TRUE))
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return _gtk_css_value_ref (&cover_singleton);
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else if (_gtk_css_parser_try (parser, "contain", TRUE))
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return _gtk_css_value_ref (&contain_singleton);
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if (_gtk_css_parser_try (parser, "auto", TRUE))
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x = NULL;
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else
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{
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x = _gtk_css_number_value_parse (parser,
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GTK_CSS_POSITIVE_ONLY
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| GTK_CSS_PARSE_PERCENT
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| GTK_CSS_PARSE_LENGTH);
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if (x == NULL)
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return NULL;
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}
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if (_gtk_css_parser_try (parser, "auto", TRUE))
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y = NULL;
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else if (!gtk_css_number_value_can_parse (parser))
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y = NULL;
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else
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{
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y = _gtk_css_number_value_parse (parser,
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GTK_CSS_POSITIVE_ONLY
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| GTK_CSS_PARSE_PERCENT
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| GTK_CSS_PARSE_LENGTH);
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if (y == NULL)
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{
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_gtk_css_value_unref (x);
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return NULL;
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}
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}
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return _gtk_css_bg_size_value_new (x, y);
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}
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static void
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gtk_css_bg_size_compute_size_for_cover_contain (gboolean cover,
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GtkCssImage *image,
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double width,
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double height,
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double *concrete_width,
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double *concrete_height)
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{
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double aspect, image_aspect;
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image_aspect = _gtk_css_image_get_aspect_ratio (image);
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if (image_aspect == 0.0)
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{
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*concrete_width = width;
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*concrete_height = height;
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return;
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}
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aspect = width / height;
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if ((aspect >= image_aspect && cover) ||
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(aspect < image_aspect && !cover))
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{
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*concrete_width = width;
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*concrete_height = width / image_aspect;
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}
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else
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{
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*concrete_height = height;
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*concrete_width = height * image_aspect;
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}
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}
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void
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_gtk_css_bg_size_value_compute_size (const GtkCssValue *value,
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GtkCssImage *image,
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double area_width,
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double area_height,
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double *out_width,
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double *out_height)
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{
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g_return_if_fail (value->class == >K_CSS_VALUE_BG_SIZE);
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if (value->contain || value->cover)
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{
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gtk_css_bg_size_compute_size_for_cover_contain (value->cover,
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image,
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area_width, area_height,
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out_width, out_height);
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}
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else
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{
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double x, y;
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/* note: 0 does the right thing later for 'auto' */
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x = value->x ? _gtk_css_number_value_get (value->x, area_width) : 0;
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y = value->y ? _gtk_css_number_value_get (value->y, area_height) : 0;
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if ((x <= 0 && value->x) ||
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(y <= 0 && value->y))
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{
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*out_width = 0;
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*out_height = 0;
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}
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else
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{
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_gtk_css_image_get_concrete_size (image,
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x, y,
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area_width, area_height,
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out_width, out_height);
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}
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}
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}
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