439 lines
15 KiB
C
439 lines
15 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2010 Carlos Garnacho <carlosg@gnome.org>
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* Authors: Carlos Garnacho <carlosg@gnome.org>
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* Cosimo Cecchi <cosimoc@gnome.org>
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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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gtkcsstypesprivate.h"
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#include "gtkthemingbackgroundprivate.h"
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#include "gtkthemingengineprivate.h"
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#include <gdk/gdk.h>
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static void
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_gtk_theming_background_apply_window_background (GtkThemingBackground *bg,
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cairo_t *cr)
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{
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if (gtk_theming_engine_has_class (bg->engine, "background"))
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{
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cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.0); /* transparent */
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cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
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cairo_paint (cr);
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}
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}
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static void
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_gtk_theming_background_apply_running_transformation (GtkThemingBackground *bg,
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cairo_t *cr)
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{
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gboolean running;
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gdouble progress;
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cairo_pattern_t *other_pattern;
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GtkStateFlags other_flags;
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GdkRGBA other_bg;
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cairo_pattern_t *new_pattern = NULL;
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running = gtk_theming_engine_state_is_running (bg->engine, GTK_STATE_PRELIGHT, &progress);
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if (!running)
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return;
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if (bg->flags & GTK_STATE_FLAG_PRELIGHT)
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{
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other_flags = bg->flags & ~(GTK_STATE_FLAG_PRELIGHT);
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progress = 1 - progress;
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}
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else
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other_flags = bg->flags | GTK_STATE_FLAG_PRELIGHT;
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gtk_theming_engine_get_background_color (bg->engine, other_flags, &other_bg);
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_gtk_theming_engine_get (bg->engine, other_flags, &bg->prop_context,
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"background-image", &other_pattern,
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NULL);
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if (bg->pattern && other_pattern)
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{
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cairo_pattern_type_t type, other_type;
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gint n0, n1;
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cairo_pattern_get_color_stop_count (bg->pattern, &n0);
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cairo_pattern_get_color_stop_count (other_pattern, &n1);
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type = cairo_pattern_get_type (bg->pattern);
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other_type = cairo_pattern_get_type (other_pattern);
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if (type == other_type && n0 == n1)
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{
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gdouble offset0, red0, green0, blue0, alpha0;
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gdouble offset1, red1, green1, blue1, alpha1;
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gdouble x00, x01, y00, y01, x10, x11, y10, y11;
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gdouble r00, r01, r10, r11;
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guint i;
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if (type == CAIRO_PATTERN_TYPE_LINEAR)
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{
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cairo_pattern_get_linear_points (bg->pattern, &x00, &y00, &x01, &y01);
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cairo_pattern_get_linear_points (other_pattern, &x10, &y10, &x11, &y11);
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new_pattern = cairo_pattern_create_linear (x00 + (x10 - x00) * progress,
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y00 + (y10 - y00) * progress,
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x01 + (x11 - x01) * progress,
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y01 + (y11 - y01) * progress);
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}
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else
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{
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cairo_pattern_get_radial_circles (bg->pattern, &x00, &y00, &r00, &x01, &y01, &r01);
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cairo_pattern_get_radial_circles (other_pattern, &x10, &y10, &r10, &x11, &y11, &r11);
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new_pattern = cairo_pattern_create_radial (x00 + (x10 - x00) * progress,
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y00 + (y10 - y00) * progress,
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r00 + (r10 - r00) * progress,
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x01 + (x11 - x01) * progress,
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y01 + (y11 - y01) * progress,
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r01 + (r11 - r01) * progress);
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}
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cairo_pattern_set_filter (new_pattern, CAIRO_FILTER_FAST);
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i = 0;
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/* Blend both gradients into one */
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while (i < n0 && i < n1)
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{
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cairo_pattern_get_color_stop_rgba (bg->pattern, i,
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&offset0,
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&red0, &green0, &blue0,
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&alpha0);
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cairo_pattern_get_color_stop_rgba (other_pattern, i,
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&offset1,
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&red1, &green1, &blue1,
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&alpha1);
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cairo_pattern_add_color_stop_rgba (new_pattern,
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offset0 + ((offset1 - offset0) * progress),
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red0 + ((red1 - red0) * progress),
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green0 + ((green1 - green0) * progress),
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blue0 + ((blue1 - blue0) * progress),
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alpha0 + ((alpha1 - alpha0) * progress));
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i++;
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}
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}
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else
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{
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cairo_save (cr);
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cairo_rectangle (cr, 0, 0, bg->paint_area.width, bg->paint_area.height);
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cairo_clip (cr);
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cairo_push_group (cr);
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cairo_scale (cr, bg->paint_area.width, bg->paint_area.height);
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cairo_set_source (cr, other_pattern);
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cairo_paint_with_alpha (cr, progress);
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cairo_set_source (cr, bg->pattern);
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cairo_paint_with_alpha (cr, 1.0 - progress);
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new_pattern = cairo_pop_group (cr);
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cairo_restore (cr);
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}
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}
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else if (bg->pattern || other_pattern)
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{
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cairo_pattern_t *p;
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const GdkRGBA *c;
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gdouble x0, y0, x1, y1, r0, r1;
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gint n, i;
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/* Blend a pattern with a color */
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if (bg->pattern)
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{
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p = bg->pattern;
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c = &other_bg;
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progress = 1 - progress;
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}
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else
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{
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p = other_pattern;
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c = &bg->bg_color;
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}
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if (cairo_pattern_get_type (p) == CAIRO_PATTERN_TYPE_LINEAR)
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{
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cairo_pattern_get_linear_points (p, &x0, &y0, &x1, &y1);
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new_pattern = cairo_pattern_create_linear (x0, y0, x1, y1);
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}
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else
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{
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cairo_pattern_get_radial_circles (p, &x0, &y0, &r0, &x1, &y1, &r1);
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new_pattern = cairo_pattern_create_radial (x0, y0, r0, x1, y1, r1);
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}
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cairo_pattern_get_color_stop_count (p, &n);
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for (i = 0; i < n; i++)
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{
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gdouble red1, green1, blue1, alpha1;
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gdouble offset;
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cairo_pattern_get_color_stop_rgba (p, i,
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&offset,
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&red1, &green1, &blue1,
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&alpha1);
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cairo_pattern_add_color_stop_rgba (new_pattern, offset,
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c->red + ((red1 - c->red) * progress),
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c->green + ((green1 - c->green) * progress),
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c->blue + ((blue1 - c->blue) * progress),
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c->alpha + ((alpha1 - c->alpha) * progress));
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}
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}
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else
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{
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/* Merge just colors */
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new_pattern = cairo_pattern_create_rgba (CLAMP (bg->bg_color.red + ((other_bg.red - bg->bg_color.red) * progress), 0, 1),
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CLAMP (bg->bg_color.green + ((other_bg.green - bg->bg_color.green) * progress), 0, 1),
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CLAMP (bg->bg_color.blue + ((other_bg.blue - bg->bg_color.blue) * progress), 0, 1),
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CLAMP (bg->bg_color.alpha + ((other_bg.alpha - bg->bg_color.alpha) * progress), 0, 1));
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}
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if (new_pattern)
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{
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/* Replace pattern to use */
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cairo_pattern_destroy (bg->pattern);
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bg->pattern = new_pattern;
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}
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if (other_pattern)
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cairo_pattern_destroy (other_pattern);
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}
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static void
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_gtk_theming_background_apply_origin (GtkThemingBackground *bg)
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{
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GtkCssArea origin;
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cairo_rectangle_t image_rect;
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gtk_theming_engine_get (bg->engine, bg->flags,
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"background-origin", &origin,
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NULL);
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/* The default size of the background image depends on the
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background-origin value as this affects the top left
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and the bottom right corners. */
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switch (origin) {
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case GTK_CSS_AREA_BORDER_BOX:
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image_rect.x = 0;
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image_rect.y = 0;
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image_rect.width = bg->paint_area.width;
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image_rect.height = bg->paint_area.height;
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break;
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case GTK_CSS_AREA_CONTENT_BOX:
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image_rect.x = bg->border.left + bg->padding.left;
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image_rect.y = bg->border.top + bg->padding.top;
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image_rect.width = bg->paint_area.width - bg->border.left - bg->border.right - bg->padding.left - bg->padding.right;
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image_rect.height = bg->paint_area.height - bg->border.top - bg->border.bottom - bg->padding.top - bg->padding.bottom;
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break;
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case GTK_CSS_AREA_PADDING_BOX:
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default:
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image_rect.x = bg->border.left;
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image_rect.y = bg->border.top;
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image_rect.width = bg->paint_area.width - bg->border.left - bg->border.right;
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image_rect.height = bg->paint_area.height - bg->border.top - bg->border.bottom;
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break;
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}
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bg->image_rect = image_rect;
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bg->prop_context.width = image_rect.width;
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bg->prop_context.height = image_rect.height;
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}
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static void
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_gtk_theming_background_apply_clip (GtkThemingBackground *bg)
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{
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GtkCssArea clip;
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gtk_theming_engine_get (bg->engine, bg->flags,
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"background-clip", &clip,
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NULL);
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if (clip == GTK_CSS_AREA_PADDING_BOX)
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{
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_gtk_rounded_box_shrink (&bg->clip_box,
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bg->border.top, bg->border.right,
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bg->border.bottom, bg->border.left);
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}
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else if (clip == GTK_CSS_AREA_CONTENT_BOX)
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{
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_gtk_rounded_box_shrink (&bg->clip_box,
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bg->border.top + bg->padding.top,
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bg->border.right + bg->padding.right,
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bg->border.bottom + bg->padding.bottom,
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bg->border.left + bg->padding.left);
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}
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}
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static void
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_gtk_theming_background_paint (GtkThemingBackground *bg,
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cairo_t *cr)
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{
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_gtk_rounded_box_path (&bg->clip_box, cr);
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gdk_cairo_set_source_rgba (cr, &bg->bg_color);
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if (bg->pattern)
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{
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GtkCssBackgroundRepeat *repeat;
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cairo_surface_t *surface;
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int scale_width, scale_height;
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gtk_theming_engine_get (bg->engine, bg->flags,
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"background-repeat", &repeat,
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NULL);
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/* Fill background color first */
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cairo_fill_preserve (cr);
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if (cairo_pattern_get_surface (bg->pattern, &surface) != CAIRO_STATUS_SUCCESS)
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surface = NULL;
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if (surface && repeat &&
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repeat->repeat != GTK_CSS_BACKGROUND_REPEAT_STYLE_NONE)
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{
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scale_width = cairo_image_surface_get_width (surface);
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scale_height = cairo_image_surface_get_height (surface);
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if (repeat->repeat == GTK_CSS_BACKGROUND_REPEAT_STYLE_REPEAT)
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cairo_pattern_set_extend (bg->pattern, CAIRO_EXTEND_REPEAT);
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else if (repeat->repeat == GTK_CSS_BACKGROUND_REPEAT_STYLE_NO_REPEAT)
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cairo_pattern_set_extend (bg->pattern, CAIRO_EXTEND_NONE);
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}
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else
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{
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cairo_pattern_set_extend (bg->pattern, CAIRO_EXTEND_PAD);
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scale_width = bg->image_rect.width;
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scale_height = bg->image_rect.height;
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}
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cairo_translate (cr, bg->image_rect.x, bg->image_rect.y);
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cairo_scale (cr, scale_width, scale_height);
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cairo_set_source (cr, bg->pattern);
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cairo_scale (cr, 1.0 / scale_width, 1.0 / scale_height);
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cairo_translate (cr, -bg->image_rect.x, -bg->image_rect.y);
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g_free (repeat);
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cairo_pattern_destroy (bg->pattern);
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bg->pattern = NULL;
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}
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cairo_fill (cr);
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}
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static void
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_gtk_theming_background_apply_shadow (GtkThemingBackground *bg,
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cairo_t *cr)
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{
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GtkShadow *box_shadow;
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gtk_theming_engine_get (bg->engine, bg->flags,
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"box-shadow", &box_shadow,
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NULL);
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if (box_shadow != NULL)
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{
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_gtk_box_shadow_render (box_shadow, cr, &bg->padding_box);
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_gtk_shadow_unref (box_shadow);
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}
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}
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static void
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_gtk_theming_background_init_engine (GtkThemingBackground *bg)
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{
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bg->flags = gtk_theming_engine_get_state (bg->engine);
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gtk_theming_engine_get_border (bg->engine, bg->flags, &bg->border);
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gtk_theming_engine_get_padding (bg->engine, bg->flags, &bg->padding);
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gtk_theming_engine_get_background_color (bg->engine, bg->flags, &bg->bg_color);
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/* In the CSS box model, by default the background positioning area is
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* the padding-box, i.e. all the border-box minus the borders themselves,
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* which determines also its default size, see
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* http://dev.w3.org/csswg/css3-background/#background-origin
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*
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* In the future we might want to support different origins or clips, but
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* right now we just shrink to the default.
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*/
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_gtk_rounded_box_init_rect (&bg->padding_box, 0, 0, bg->paint_area.width, bg->paint_area.height);
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_gtk_rounded_box_apply_border_radius (&bg->padding_box, bg->engine, bg->flags, bg->junction);
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bg->clip_box = bg->padding_box;
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_gtk_rounded_box_shrink (&bg->padding_box,
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bg->border.top, bg->border.right,
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bg->border.bottom, bg->border.left);
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_gtk_theming_background_apply_clip (bg);
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_gtk_theming_background_apply_origin (bg);
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_gtk_theming_engine_get (bg->engine, bg->flags, &bg->prop_context,
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"background-image", &bg->pattern,
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NULL);
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}
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void
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_gtk_theming_background_init (GtkThemingBackground *bg,
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GtkThemingEngine *engine,
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gdouble x,
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gdouble y,
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gdouble width,
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gdouble height,
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GtkJunctionSides junction)
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{
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g_assert (bg != NULL);
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bg->engine = engine;
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bg->paint_area.x = x;
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bg->paint_area.y = y;
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bg->paint_area.width = width;
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bg->paint_area.height = height;
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bg->pattern = NULL;
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bg->junction = junction;
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_gtk_theming_background_init_engine (bg);
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}
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void
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_gtk_theming_background_render (GtkThemingBackground *bg,
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cairo_t *cr)
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{
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cairo_save (cr);
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cairo_translate (cr, bg->paint_area.x, bg->paint_area.y);
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_gtk_theming_background_apply_window_background (bg, cr);
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_gtk_theming_background_apply_running_transformation (bg, cr);
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_gtk_theming_background_paint (bg, cr);
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_gtk_theming_background_apply_shadow (bg, cr);
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cairo_restore (cr);
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}
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gboolean
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_gtk_theming_background_has_background_image (GtkThemingBackground *bg)
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{
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return (bg->pattern != NULL) ? TRUE : FALSE;
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}
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