269 lines
7.7 KiB
C
269 lines
7.7 KiB
C
/*
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* Copyright © 2012 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 2.1 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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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include <string.h>
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#include "gtkcssimagecrossfadeprivate.h"
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#include "gtkcssnumbervalueprivate.h"
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G_DEFINE_TYPE (GtkCssImageCrossFade, _gtk_css_image_cross_fade, GTK_TYPE_CSS_IMAGE)
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static int
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gtk_css_image_cross_fade_get_width (GtkCssImage *image)
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{
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GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
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int start_width, end_width;
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if (cross_fade->start)
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{
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start_width = _gtk_css_image_get_width (cross_fade->start);
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/* no intrinsic width, what now? */
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if (start_width == 0)
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return 0;
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}
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else
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start_width = 0;
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if (cross_fade->end)
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{
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end_width = _gtk_css_image_get_width (cross_fade->end);
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/* no intrinsic width, what now? */
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if (end_width == 0)
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return 0;
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}
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else
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end_width = 0;
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return start_width + (end_width - start_width) * cross_fade->progress;
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}
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static int
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gtk_css_image_cross_fade_get_height (GtkCssImage *image)
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{
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GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
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int start_height, end_height;
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if (cross_fade->start)
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{
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start_height = _gtk_css_image_get_height (cross_fade->start);
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/* no intrinsic height, what now? */
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if (start_height == 0)
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return 0;
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}
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else
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start_height = 0;
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if (cross_fade->end)
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{
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end_height = _gtk_css_image_get_height (cross_fade->end);
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/* no intrinsic height, what now? */
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if (end_height == 0)
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return 0;
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}
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else
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end_height = 0;
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return start_height + (end_height - start_height) * cross_fade->progress;
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}
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static void
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gtk_css_image_cross_fade_draw (GtkCssImage *image,
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cairo_t *cr,
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double width,
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double height)
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{
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GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
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if (cross_fade->progress <= 0.0)
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{
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if (cross_fade->start)
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_gtk_css_image_draw (cross_fade->start, cr, width, height);
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}
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else if (cross_fade->progress >= 1.0)
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{
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if (cross_fade->end)
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_gtk_css_image_draw (cross_fade->end, cr, width, height);
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}
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else
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{
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cairo_surface_t *surface;
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if (cross_fade->start && cross_fade->end)
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{
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/* to reduce the group size */
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_clip (cr);
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cairo_push_group (cr);
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_gtk_css_image_draw (cross_fade->start, cr, width, height);
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surface = _gtk_css_image_get_surface (cross_fade->end,
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cairo_get_target (cr),
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width, height);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint_with_alpha (cr, cross_fade->progress);
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cairo_surface_destroy (surface);
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cairo_pop_group_to_source (cr);
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cairo_paint (cr);
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}
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else if (cross_fade->start || cross_fade->end)
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{
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surface = _gtk_css_image_get_surface (cross_fade->start ? cross_fade->start : cross_fade->end,
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cairo_get_target (cr),
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width, height);
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cairo_set_source_surface (cr, surface, 0, 0);
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cairo_paint_with_alpha (cr, cross_fade->start ? 1.0 - cross_fade->progress : cross_fade->progress);
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cairo_surface_destroy (surface);
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}
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}
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}
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static gboolean
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gtk_css_image_cross_fade_parse (GtkCssImage *image,
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GtkCssParser *parser)
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{
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GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
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GtkCssValue *number;
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if (!_gtk_css_parser_try (parser, "cross-fade(", TRUE))
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{
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_gtk_css_parser_error (parser, "Expected 'cross-fade('");
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return FALSE;
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}
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cross_fade->start = _gtk_css_image_new_parse (parser);
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if (cross_fade->start == NULL)
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return FALSE;
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if (!_gtk_css_parser_try (parser, ",", TRUE))
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{
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_gtk_css_parser_error (parser, "Missing comma after first image");
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return FALSE;
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}
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cross_fade->end = _gtk_css_image_new_parse (parser);
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if (cross_fade->end == NULL)
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return FALSE;
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if (!_gtk_css_parser_try (parser, ",", TRUE))
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{
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_gtk_css_parser_error (parser, "Missing comma after second image");
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return FALSE;
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}
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if (!_gtk_css_parser_try (parser, ")", TRUE))
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{
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_gtk_css_parser_error (parser, "Missing closing bracket");
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return FALSE;
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}
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number = _gtk_css_number_value_parse (parser, GTK_CSS_PARSE_PERCENT | GTK_CSS_POSITIVE_ONLY);
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if (number == NULL)
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return FALSE;
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cross_fade->progress = _gtk_css_number_value_get (number, 1);
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_gtk_css_value_unref (number);
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if (cross_fade->progress > 100)
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{
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_gtk_css_parser_error (parser, "Percentages ovre 100%% are not allowed");
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return FALSE;
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}
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cross_fade->progress /= 100.0;
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return TRUE;
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}
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static void
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gtk_css_image_cross_fade_print (GtkCssImage *image,
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GString *string)
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{
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GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (image);
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g_string_append (string, "cross_fade(");
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if (cross_fade->start)
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_gtk_css_image_print (cross_fade->start, string);
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else
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g_string_append (string, "none");
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g_string_append (string, ",");
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if (cross_fade->end)
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_gtk_css_image_print (cross_fade->end, string);
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else
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g_string_append (string, "none");
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g_string_append (string, ",");
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g_string_append_printf (string, "%g%%", cross_fade->progress * 100.0);
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g_string_append (string, ")");
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}
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static void
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gtk_css_image_cross_fade_dispose (GObject *object)
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{
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GtkCssImageCrossFade *cross_fade = GTK_CSS_IMAGE_CROSS_FADE (object);
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g_clear_object (&cross_fade->start);
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g_clear_object (&cross_fade->end);
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G_OBJECT_CLASS (_gtk_css_image_cross_fade_parent_class)->dispose (object);
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}
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static void
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_gtk_css_image_cross_fade_class_init (GtkCssImageCrossFadeClass *klass)
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{
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GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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image_class->get_width = gtk_css_image_cross_fade_get_width;
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image_class->get_height = gtk_css_image_cross_fade_get_height;
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image_class->draw = gtk_css_image_cross_fade_draw;
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image_class->parse = gtk_css_image_cross_fade_parse;
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image_class->print = gtk_css_image_cross_fade_print;
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object_class->dispose = gtk_css_image_cross_fade_dispose;
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}
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static void
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_gtk_css_image_cross_fade_init (GtkCssImageCrossFade *image_cross_fade)
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{
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}
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GtkCssImage *
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_gtk_css_image_cross_fade_new (GtkCssImage *start,
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GtkCssImage *end,
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double progress)
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{
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GtkCssImageCrossFade *cross_fade;
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g_return_val_if_fail (start == NULL || GTK_IS_CSS_IMAGE (start), NULL);
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g_return_val_if_fail (end == NULL || GTK_IS_CSS_IMAGE (end), NULL);
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cross_fade = g_object_new (GTK_TYPE_CSS_IMAGE_CROSS_FADE, NULL);
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if (start)
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cross_fade->start = g_object_ref (start);
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if (end)
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cross_fade->end = g_object_ref (end);
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cross_fade->progress = progress;
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return GTK_CSS_IMAGE (cross_fade);
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}
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