forked from AuroraMiddleware/gtk
323 lines
12 KiB
C
323 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 <cairo-gobject.h>
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#include <math.h>
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#include "gtkborderimageprivate.h"
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#include "gtkcssbordervalueprivate.h"
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#include "gtkcssimagevalueprivate.h"
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#include "gtkcssnumbervalueprivate.h"
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#include "gtkcssrepeatvalueprivate.h"
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#include "gtkstylepropertiesprivate.h"
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#include "gtkthemingengineprivate.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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gboolean
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_gtk_border_image_init (GtkBorderImage *image,
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GtkThemingEngine *engine)
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{
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image->source = _gtk_css_image_value_get_image (_gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_IMAGE_SOURCE));
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if (image->source == NULL)
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return FALSE;
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image->slice = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_IMAGE_SLICE);
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image->width = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_IMAGE_WIDTH);
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image->repeat = _gtk_theming_engine_peek_property (engine, GTK_CSS_PROPERTY_BORDER_IMAGE_REPEAT);
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return TRUE;
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}
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typedef struct _GtkBorderImageSliceSize GtkBorderImageSliceSize;
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struct _GtkBorderImageSliceSize {
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double offset;
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double size;
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};
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static void
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gtk_border_image_compute_border_size (GtkBorderImageSliceSize sizes[3],
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double offset,
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double area_size,
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double start_border_width,
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double end_border_width,
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const GtkCssValue *start_border,
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const GtkCssValue *end_border)
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{
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double start, end;
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if (_gtk_css_number_value_get_unit (start_border) == GTK_CSS_NUMBER)
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start = start_border_width * _gtk_css_number_value_get (start_border, 100);
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else
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start = _gtk_css_number_value_get (start_border, area_size);
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if (_gtk_css_number_value_get_unit (end_border) == GTK_CSS_NUMBER)
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end = end_border_width * _gtk_css_number_value_get (end_border, 100);
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else
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end = _gtk_css_number_value_get (end_border, area_size);
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/* XXX: reduce vertical and horizontal by the same factor */
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if (start + end > area_size)
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{
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start = start * area_size / (start + end);
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end = end * area_size / (start + end);
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}
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sizes[0].offset = offset;
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sizes[0].size = start;
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sizes[1].offset = offset + start;
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sizes[1].size = area_size - start - end;
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sizes[2].offset = offset + area_size - end;
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sizes[2].size = end;
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}
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static void
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gtk_border_image_render_slice (cairo_t *cr,
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cairo_surface_t *slice,
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double slice_width,
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double slice_height,
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double x,
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double y,
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double width,
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double height,
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GtkCssRepeatStyle hrepeat,
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GtkCssRepeatStyle vrepeat)
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{
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double hscale, vscale;
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double xstep, ystep;
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cairo_extend_t extend = CAIRO_EXTEND_PAD;
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cairo_matrix_t matrix;
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cairo_pattern_t *pattern;
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/* We can't draw center tiles yet */
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g_assert (hrepeat == GTK_CSS_REPEAT_STYLE_STRETCH || vrepeat == GTK_CSS_REPEAT_STYLE_STRETCH);
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hscale = width / slice_width;
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vscale = height / slice_height;
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xstep = width;
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ystep = height;
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switch (hrepeat)
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{
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case GTK_CSS_REPEAT_STYLE_REPEAT:
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extend = CAIRO_EXTEND_REPEAT;
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hscale = vscale;
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break;
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case GTK_CSS_REPEAT_STYLE_SPACE:
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{
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double space, n;
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extend = CAIRO_EXTEND_NONE;
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hscale = vscale;
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xstep = hscale * slice_width;
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n = floor (width / xstep);
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space = (width - n * xstep) / (n + 1);
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xstep += space;
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x += space;
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width -= 2 * space;
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}
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break;
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case GTK_CSS_REPEAT_STYLE_STRETCH:
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break;
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case GTK_CSS_REPEAT_STYLE_ROUND:
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extend = CAIRO_EXTEND_REPEAT;
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hscale = width / (slice_width * MAX (round (width / (slice_width * vscale)), 1));
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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switch (vrepeat)
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{
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case GTK_CSS_REPEAT_STYLE_REPEAT:
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extend = CAIRO_EXTEND_REPEAT;
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vscale = hscale;
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break;
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case GTK_CSS_REPEAT_STYLE_SPACE:
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{
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double space, n;
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extend = CAIRO_EXTEND_NONE;
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vscale = hscale;
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ystep = vscale * slice_height;
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n = floor (height / ystep);
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space = (height - n * ystep) / (n + 1);
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ystep += space;
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y += space;
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height -= 2 * space;
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}
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break;
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case GTK_CSS_REPEAT_STYLE_STRETCH:
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break;
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case GTK_CSS_REPEAT_STYLE_ROUND:
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extend = CAIRO_EXTEND_REPEAT;
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vscale = height / (slice_height * MAX (round (height / (slice_height * hscale)), 1));
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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pattern = cairo_pattern_create_for_surface (slice);
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cairo_matrix_init_translate (&matrix,
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hrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? slice_width / 2 : 0,
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vrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? slice_height / 2 : 0);
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cairo_matrix_scale (&matrix, 1 / hscale, 1 / vscale);
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cairo_matrix_translate (&matrix,
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hrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? - width / 2 : 0,
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vrepeat == GTK_CSS_REPEAT_STYLE_REPEAT ? - height / 2 : 0);
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cairo_pattern_set_matrix (pattern, &matrix);
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cairo_pattern_set_extend (pattern, extend);
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cairo_save (cr);
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cairo_translate (cr, x, y);
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for (y = 0; y < height; y += ystep)
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{
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for (x = 0; x < width; x += xstep)
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{
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cairo_save (cr);
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cairo_translate (cr, x, y);
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cairo_set_source (cr, pattern);
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cairo_rectangle (cr, 0, 0, xstep, ystep);
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cairo_fill (cr);
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cairo_restore (cr);
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}
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}
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cairo_restore (cr);
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cairo_pattern_destroy (pattern);
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}
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static void
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gtk_border_image_compute_slice_size (GtkBorderImageSliceSize sizes[3],
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int surface_size,
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int start_size,
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int end_size)
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{
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sizes[0].size = MIN (start_size, surface_size);
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sizes[0].offset = 0;
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sizes[2].size = MIN (end_size, surface_size);
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sizes[2].offset = surface_size - sizes[2].size;
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sizes[1].size = MAX (0, surface_size - sizes[0].size - sizes[2].size);
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sizes[1].offset = sizes[0].size;
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}
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void
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_gtk_border_image_render (GtkBorderImage *image,
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const double border_width[4],
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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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{
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cairo_surface_t *surface, *slice;
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GtkBorderImageSliceSize vertical_slice[3], horizontal_slice[3];
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GtkBorderImageSliceSize vertical_border[3], horizontal_border[3];
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double source_width, source_height;
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int h, v;
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_gtk_css_image_get_concrete_size (image->source,
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0, 0,
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width, height,
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&source_width, &source_height);
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/* XXX: Optimize for (source_width == width && source_height == height) */
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surface = _gtk_css_image_get_surface (image->source,
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cairo_get_target (cr),
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source_width, source_height);
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gtk_border_image_compute_slice_size (horizontal_slice,
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source_width,
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_gtk_css_number_value_get (_gtk_css_border_value_get_left (image->slice), source_width),
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_gtk_css_number_value_get (_gtk_css_border_value_get_right (image->slice), source_width));
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gtk_border_image_compute_slice_size (vertical_slice,
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source_height,
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_gtk_css_number_value_get (_gtk_css_border_value_get_top (image->slice), source_height),
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_gtk_css_number_value_get (_gtk_css_border_value_get_bottom (image->slice), source_height));
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gtk_border_image_compute_border_size (horizontal_border,
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x,
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width,
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border_width[GTK_CSS_LEFT],
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border_width[GTK_CSS_RIGHT],
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_gtk_css_border_value_get_left (image->width),
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_gtk_css_border_value_get_right (image->width));
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gtk_border_image_compute_border_size (vertical_border,
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y,
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height,
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border_width[GTK_CSS_TOP],
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border_width[GTK_CSS_BOTTOM],
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_gtk_css_border_value_get_top (image->width),
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_gtk_css_border_value_get_bottom(image->width));
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for (v = 0; v < 3; v++)
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{
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if (vertical_slice[v].size == 0 ||
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vertical_border[v].size == 0)
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continue;
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for (h = 0; h < 3; h++)
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{
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if (horizontal_slice[h].size == 0 ||
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horizontal_border[h].size == 0)
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continue;
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if (h == 1 && v == 1)
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continue;
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slice = cairo_surface_create_for_rectangle (surface,
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horizontal_slice[h].offset,
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vertical_slice[v].offset,
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horizontal_slice[h].size,
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vertical_slice[v].size);
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gtk_border_image_render_slice (cr,
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slice,
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horizontal_slice[h].size,
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vertical_slice[v].size,
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horizontal_border[h].offset,
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vertical_border[v].offset,
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horizontal_border[h].size,
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vertical_border[v].size,
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h == 1 ? _gtk_css_border_repeat_value_get_x (image->repeat) : GTK_CSS_REPEAT_STYLE_STRETCH,
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v == 1 ? _gtk_css_border_repeat_value_get_y (image->repeat) : GTK_CSS_REPEAT_STYLE_STRETCH);
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cairo_surface_destroy (slice);
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}
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}
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cairo_surface_destroy (surface);
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}
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