341 lines
12 KiB
C
341 lines
12 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 "gtkcssrgbavalueprivate.h"
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#include "gtkcsstypesprivate.h"
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#include "gtkstylecontextprivate.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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typedef struct _GtkThemingBackground GtkThemingBackground;
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#define N_BOXES (3)
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struct _GtkThemingBackground {
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GtkStyleContext *context;
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GtkRoundedBox boxes[N_BOXES];
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};
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static void
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_gtk_theming_background_paint_color (GtkThemingBackground *bg,
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cairo_t *cr,
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const GdkRGBA *bg_color,
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GtkCssValue *background_image)
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{
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gint n_values = _gtk_css_array_value_get_n_values (background_image);
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GtkCssArea clip = _gtk_css_area_value_get
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(_gtk_css_array_value_get_nth
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(_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_CLIP),
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n_values - 1));
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_gtk_rounded_box_path (&bg->boxes[clip], cr);
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gdk_cairo_set_source_rgba (cr, bg_color);
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cairo_fill (cr);
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}
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static void
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_gtk_theming_background_paint_layer (GtkThemingBackground *bg,
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guint idx,
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cairo_t *cr)
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{
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GtkCssRepeatStyle hrepeat, vrepeat;
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const GtkCssValue *pos, *repeat;
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GtkCssImage *image;
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const GtkRoundedBox *origin;
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double image_width, image_height;
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double width, height;
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pos = _gtk_css_array_value_get_nth (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_POSITION), idx);
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repeat = _gtk_css_array_value_get_nth (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_REPEAT), idx);
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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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image = _gtk_css_image_value_get_image (
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_gtk_css_array_value_get_nth (
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_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_IMAGE),
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idx));
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origin = &bg->boxes[
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_gtk_css_area_value_get (
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_gtk_css_array_value_get_nth (
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_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_ORIGIN),
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idx))];
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width = origin->box.width;
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height = origin->box.height;
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if (image == NULL || width <= 0 || height <= 0)
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return;
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_gtk_css_bg_size_value_compute_size (_gtk_css_array_value_get_nth (_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_SIZE), idx),
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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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if (image_width <= 0 || image_height <= 0)
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return;
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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_save (cr);
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_gtk_rounded_box_path (
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&bg->boxes[
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_gtk_css_area_value_get (
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_gtk_css_array_value_get_nth (
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_gtk_style_context_peek_property (bg->context, GTK_CSS_PROPERTY_BACKGROUND_CLIP),
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idx))],
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cr);
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cairo_clip (cr);
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cairo_translate (cr, origin->box.x, origin->box.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 (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_rectangle_t fill_rect;
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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 (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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if (hrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
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{
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fill_rect.x = _gtk_css_position_value_get_x (pos, width - image_width);
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fill_rect.width = image_width;
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}
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else
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{
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fill_rect.x = 0;
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fill_rect.width = width;
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}
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if (vrepeat == GTK_CSS_REPEAT_STYLE_NO_REPEAT)
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{
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fill_rect.y = _gtk_css_position_value_get_y (pos, height - image_height);
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fill_rect.height = image_height;
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}
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else
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{
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fill_rect.y = 0;
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fill_rect.height = height;
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}
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cairo_rectangle (cr, fill_rect.x, fill_rect.y,
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fill_rect.width, fill_rect.height);
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cairo_fill (cr);
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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_init_context (GtkThemingBackground *bg,
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double width,
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double height,
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GtkJunctionSides junction)
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{
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GtkStateFlags flags = gtk_style_context_get_state (bg->context);
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GtkBorder border, padding;
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gtk_style_context_get_border (bg->context, flags, &border);
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gtk_style_context_get_padding (bg->context, flags, &padding);
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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->boxes[GTK_CSS_AREA_BORDER_BOX], 0, 0, width, height);
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_gtk_rounded_box_apply_border_radius_for_context (&bg->boxes[GTK_CSS_AREA_BORDER_BOX], bg->context, junction);
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bg->boxes[GTK_CSS_AREA_PADDING_BOX] = bg->boxes[GTK_CSS_AREA_BORDER_BOX];
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_gtk_rounded_box_shrink (&bg->boxes[GTK_CSS_AREA_PADDING_BOX],
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border.top, border.right,
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border.bottom, border.left);
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bg->boxes[GTK_CSS_AREA_CONTENT_BOX] = bg->boxes[GTK_CSS_AREA_PADDING_BOX];
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_gtk_rounded_box_shrink (&bg->boxes[GTK_CSS_AREA_CONTENT_BOX],
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padding.top, padding.right,
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padding.bottom, padding.left);
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}
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void
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gtk_theming_background_render (GtkStyleContext *context,
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cairo_t *cr,
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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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GtkThemingBackground bg;
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gint idx;
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GtkCssValue *background_image;
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GtkCssValue *box_shadow;
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const GdkRGBA *bg_color;
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background_image = _gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BACKGROUND_IMAGE);
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bg_color = _gtk_css_rgba_value_get_rgba (_gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
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box_shadow = _gtk_style_context_peek_property (context, GTK_CSS_PROPERTY_BOX_SHADOW);
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/* This is the common default case of no background */
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if (gtk_rgba_is_clear (bg_color) &&
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_gtk_css_array_value_get_n_values (background_image) == 1 &&
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_gtk_css_image_value_get_image (_gtk_css_array_value_get_nth (background_image, 0)) == NULL &&
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_gtk_css_shadows_value_is_none (box_shadow))
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return;
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bg.context = context;
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_gtk_theming_background_init_context (&bg, width, height, junction);
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cairo_save (cr);
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cairo_translate (cr, x, y);
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/* Outset shadows */
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_gtk_css_shadows_value_paint_box (box_shadow,
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cr,
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&bg.boxes[GTK_CSS_AREA_BORDER_BOX],
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FALSE);
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_gtk_theming_background_paint_color (&bg, cr, bg_color, background_image);
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for (idx = _gtk_css_array_value_get_n_values (background_image) - 1; idx >= 0; idx--)
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{
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_gtk_theming_background_paint_layer (&bg, idx, cr);
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}
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/* Inset shadows */
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_gtk_css_shadows_value_paint_box (box_shadow,
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cr,
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&bg.boxes[GTK_CSS_AREA_PADDING_BOX],
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TRUE);
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cairo_restore (cr);
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}
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