360 lines
13 KiB
C
360 lines
13 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gtkthemingbackgroundprivate.h"
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#include "gtkcssarrayvalueprivate.h"
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#include "gtkcssbgsizevalueprivate.h"
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#include "gtkcssenumvalueprivate.h"
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#include "gtkcssimagevalueprivate.h"
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#include "gtkcssshadowsvalueprivate.h"
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#include "gtkcsspositionvalueprivate.h"
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#include "gtkcssrepeatvalueprivate.h"
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#include "gtkcsstypesprivate.h"
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#include "gtkthemingengineprivate.h"
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#include <math.h>
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#include <gdk/gdk.h>
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/* this is in case round() is not provided by the compiler,
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* such as in the case of C89 compilers, like MSVC
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*/
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#include "fallback-c89.c"
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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_style_context_has_class (bg->context, "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_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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origin = _gtk_css_area_value_get (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_ORIGIN));
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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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/* XXX: image_rect might have negative width/height here.
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* Do we need to do something about it? */
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bg->image_rect = image_rect;
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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 = _gtk_css_area_value_get (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_CLIP));
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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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cairo_save (cr);
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_gtk_rounded_box_path (&bg->clip_box, cr);
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cairo_clip (cr);
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gdk_cairo_set_source_rgba (cr, &bg->bg_color);
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cairo_paint (cr);
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if (bg->image
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&& bg->image_rect.width > 0
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&& bg->image_rect.height > 0)
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{
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const GtkCssValue *pos, *repeat;
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double image_width, image_height;
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double width, height;
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GtkCssRepeatStyle hrepeat, vrepeat;
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pos = _gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_POSITION);
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repeat = _gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_REPEAT);
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hrepeat = _gtk_css_background_repeat_value_get_x (repeat);
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vrepeat = _gtk_css_background_repeat_value_get_y (repeat);
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width = bg->image_rect.width;
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height = bg->image_rect.height;
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_gtk_css_bg_size_value_compute_size (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_SIZE),
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bg->image,
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width,
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height,
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&image_width,
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&image_height);
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/* optimization */
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if (image_width == width)
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hrepeat = GTK_CSS_REPEAT_STYLE_NO_REPEAT;
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if (image_height == height)
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vrepeat = GTK_CSS_REPEAT_STYLE_NO_REPEAT;
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cairo_translate (cr, bg->image_rect.x, bg->image_rect.y);
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if (hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT && vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
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{
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cairo_translate (cr,
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_gtk_css_position_value_get_x (pos, width - image_width),
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_gtk_css_position_value_get_y (pos, height - image_height));
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/* shortcut for normal case */
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_gtk_css_image_draw (bg->image, cr, image_width, image_height);
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}
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else
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{
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int surface_width, surface_height;
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cairo_surface_t *surface;
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cairo_t *cr2;
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/* If ‘background-repeat’ is ‘round’ for one (or both) dimensions,
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* there is a second step. The UA must scale the image in that
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* dimension (or both dimensions) so that it fits a whole number of
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* times in the background positioning area. In the case of the width
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* (height is analogous):
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*
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* If X ≠ 0 is the width of the image after step one and W is the width
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* of the background positioning area, then the rounded width
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* X' = W / round(W / X) where round() is a function that returns the
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* nearest natural number (integer greater than zero).
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*
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* If ‘background-repeat’ is ‘round’ for one dimension only and if
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* ‘background-size’ is ‘auto’ for the other dimension, then there is
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* a third step: that other dimension is scaled so that the original
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* aspect ratio is restored.
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*/
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if (hrepeat == GTK_CSS_REPEAT_STYLE_ROUND)
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{
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double n = round (width / image_width);
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n = MAX (1, n);
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if (vrepeat != GTK_CSS_REPEAT_STYLE_ROUND
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/* && vsize == auto (it is by default) */)
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image_height *= width / (image_width * n);
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image_width = width / n;
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}
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if (vrepeat == GTK_CSS_REPEAT_STYLE_ROUND)
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{
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double n = round (height / image_height);
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n = MAX (1, n);
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if (hrepeat != GTK_CSS_REPEAT_STYLE_ROUND
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/* && hsize == auto (it is by default) */)
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image_width *= height / (image_height * n);
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image_height = height / n;
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}
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/* if hrepeat or vrepeat is 'space', we create a somewhat larger surface
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* to store the extra space. */
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if (hrepeat == GTK_CSS_REPEAT_STYLE_SPACE)
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{
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double n = floor (width / image_width);
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surface_width = n ? round (width / n) : 0;
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}
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else
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surface_width = round (image_width);
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if (vrepeat == GTK_CSS_REPEAT_STYLE_SPACE)
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{
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double n = floor (height / image_height);
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surface_height = n ? round (height / n) : 0;
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}
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else
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surface_height = round (image_height);
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surface = cairo_surface_create_similar (cairo_get_target (cr),
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CAIRO_CONTENT_COLOR_ALPHA,
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surface_width, surface_height);
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cr2 = cairo_create (surface);
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cairo_translate (cr2,
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0.5 * (surface_width - image_width),
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0.5 * (surface_height - image_height));
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_gtk_css_image_draw (bg->image, cr2, image_width, image_height);
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cairo_destroy (cr2);
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cairo_set_source_surface (cr, surface,
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_gtk_css_position_value_get_x (pos, width - image_width),
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_gtk_css_position_value_get_y (pos, height - image_height));
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cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_REPEAT);
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cairo_surface_destroy (surface);
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cairo_rectangle (cr,
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0, 0,
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hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT ? image_width : width,
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vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT ? image_height : height);
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cairo_fill (cr);
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}
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}
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cairo_restore (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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_gtk_css_shadows_value_paint_box (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BOX_SHADOW),
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cr,
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&bg->padding_box);
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}
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static void
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_gtk_theming_background_init_context (GtkThemingBackground *bg)
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{
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bg->flags = gtk_style_context_get_state (bg->context);
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gtk_style_context_get_border (bg->context, bg->flags, &bg->border);
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gtk_style_context_get_padding (bg->context, bg->flags, &bg->padding);
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gtk_style_context_get_background_color (bg->context, 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_for_context (&bg->padding_box, bg->context, 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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bg->image = _gtk_css_image_value_get_image (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_IMAGE));
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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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GtkStyleContext *context;
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g_assert (bg != NULL);
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context = _gtk_theming_engine_get_context (engine);
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_gtk_theming_background_init_from_context (bg, context,
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x, y, width, height,
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junction);
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}
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void
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_gtk_theming_background_init_from_context (GtkThemingBackground *bg,
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GtkStyleContext *context,
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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->context = context;
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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->image = NULL;
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bg->junction = junction;
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_gtk_theming_background_init_context (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_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->image != NULL) ? TRUE : FALSE;
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}
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