510 lines
14 KiB
C
510 lines
14 KiB
C
/*
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* Copyright © 2012 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkcssimagelinearprivate.h"
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#include <math.h>
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#include "gtkcssprovider.h"
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#include "gtkstylecontextprivate.h"
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G_DEFINE_TYPE (GtkCssImageLinear, _gtk_css_image_linear, GTK_TYPE_CSS_IMAGE)
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static void
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gtk_css_image_linear_get_start_end (GtkCssImageLinear *linear,
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double length,
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double *start,
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double *end)
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{
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GtkCssImageLinearColorStop *stop;
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double pos;
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guint i;
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, 0);
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if (stop->offset.unit == GTK_CSS_NUMBER)
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*start = 0;
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else if (stop->offset.unit == GTK_CSS_PX)
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*start = stop->offset.value / length;
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else
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*start = stop->offset.value / 100;
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*end = *start;
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for (i = 0; i < linear->stops->len; i++)
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{
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, i);
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if (stop->offset.unit == GTK_CSS_NUMBER)
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continue;
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if (stop->offset.unit == GTK_CSS_PX)
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pos = stop->offset.value / length;
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else
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pos = stop->offset.value / 100;
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*end = MAX (pos, *end);
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}
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if (stop->offset.unit == GTK_CSS_NUMBER)
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*end = MAX (*end, 1.0);
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}
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static void
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gtk_css_image_linear_compute_start_point (double angle_in_degrees,
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double width,
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double height,
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double *x,
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double *y)
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{
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double angle, c, slope, perpendicular;
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angle = fmod (angle_in_degrees, 360);
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if (angle < 0)
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angle += 360;
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if (angle == 0)
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{
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*x = 0;
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*y = -height;
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return;
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}
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else if (angle == 90)
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{
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*x = width;
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*y = 0;
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return;
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}
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else if (angle == 180)
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{
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*x = 0;
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*y = height;
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return;
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}
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else if (angle == 270)
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{
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*x = -width;
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*y = 0;
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return;
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}
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/* The tan() is confusing because the angle is clockwise
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* from 'to top' */
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perpendicular = tan (angle * G_PI / 180);
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slope = -1 / perpendicular;
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if (angle > 180)
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width = - width;
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if (angle < 90 || angle > 270)
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height = - height;
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/* Compute c (of y = mx + c) of perpendicular */
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c = height - perpendicular * width;
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*x = c / (slope - perpendicular);
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*y = perpendicular * *x + c;
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}
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static void
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gtk_css_image_linear_draw (GtkCssImage *image,
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cairo_t *cr,
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double width,
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double height)
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{
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GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (image);
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cairo_pattern_t *pattern;
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double x, y; /* coordinates of start point */
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double length; /* distance in pixels for 100% */
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double start, end; /* position of first/last point on gradient line - with gradient line being [0, 1] */
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double offset;
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int i, last;
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g_return_if_fail (linear->is_computed);
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if (linear->angle.unit == GTK_CSS_NUMBER)
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{
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guint side = linear->angle.value;
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if (side & (1 << GTK_CSS_RIGHT))
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x = width;
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else if (side & (1 << GTK_CSS_LEFT))
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x = -width;
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else
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x = 0;
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if (side & (1 << GTK_CSS_TOP))
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y = -height;
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else if (side & (1 << GTK_CSS_BOTTOM))
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y = height;
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else
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y = 0;
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}
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else
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{
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gtk_css_image_linear_compute_start_point (linear->angle.value,
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width, height,
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&x, &y);
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}
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length = sqrt (x * x + y * y);
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gtk_css_image_linear_get_start_end (linear, length, &start, &end);
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pattern = cairo_pattern_create_linear (x * (start - 0.5), y * (start - 0.5),
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x * (end - 0.5), y * (end - 0.5));
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if (linear->repeating)
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
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else
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_PAD);
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offset = start;
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last = -1;
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for (i = 0; i < linear->stops->len; i++)
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{
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GtkCssImageLinearColorStop *stop;
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double pos, step;
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, i);
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if (stop->offset.unit == GTK_CSS_NUMBER)
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{
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if (i == 0)
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pos = 0.0;
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else if (i + 1 == linear->stops->len)
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pos = 1.0;
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else
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continue;
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}
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else if (stop->offset.unit == GTK_CSS_PX)
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pos = stop->offset.value / length;
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else
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pos = stop->offset.value / 100;
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pos = MAX (pos, offset);
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step = (pos - offset) / (i - last);
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for (last = last + 1; last <= i; last++)
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{
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, last);
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offset += step;
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cairo_pattern_add_color_stop_rgba (pattern,
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(offset - start) / (end - start),
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stop->color.rgba.red,
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stop->color.rgba.green,
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stop->color.rgba.blue,
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stop->color.rgba.alpha);
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}
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offset = pos;
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last = i;
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}
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cairo_rectangle (cr, 0, 0, width, height);
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cairo_translate (cr, width / 2, height / 2);
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cairo_set_source (cr, pattern);
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cairo_fill (cr);
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cairo_pattern_destroy (pattern);
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}
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static gboolean
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gtk_css_image_linear_parse (GtkCssImage *image,
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GtkCssParser *parser,
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GFile *base)
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{
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GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (image);
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guint i;
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if (_gtk_css_parser_try (parser, "repeating-linear-gradient(", TRUE))
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linear->repeating = TRUE;
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else if (_gtk_css_parser_try (parser, "linear-gradient(", TRUE))
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linear->repeating = FALSE;
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else
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{
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_gtk_css_parser_error (parser, "Not a linear gradient");
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return FALSE;
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}
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if (_gtk_css_parser_try (parser, "to", TRUE))
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{
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guint side = 0;
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for (i = 0; i < 2; i++)
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{
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if (_gtk_css_parser_try (parser, "left", TRUE))
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{
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if (side & ((1 << GTK_CSS_LEFT) | (1 << GTK_CSS_RIGHT)))
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{
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_gtk_css_parser_error (parser, "Expected `top', `bottom' or comma");
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return FALSE;
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}
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side |= (1 << GTK_CSS_LEFT);
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}
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else if (_gtk_css_parser_try (parser, "right", TRUE))
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{
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if (side & ((1 << GTK_CSS_LEFT) | (1 << GTK_CSS_RIGHT)))
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{
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_gtk_css_parser_error (parser, "Expected `top', `bottom' or comma");
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return FALSE;
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}
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side |= (1 << GTK_CSS_RIGHT);
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}
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else if (_gtk_css_parser_try (parser, "top", TRUE))
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{
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if (side & ((1 << GTK_CSS_TOP) | (1 << GTK_CSS_BOTTOM)))
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{
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_gtk_css_parser_error (parser, "Expected `left', `right' or comma");
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return FALSE;
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}
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side |= (1 << GTK_CSS_TOP);
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}
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else if (_gtk_css_parser_try (parser, "bottom", TRUE))
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{
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if (side & ((1 << GTK_CSS_TOP) | (1 << GTK_CSS_BOTTOM)))
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{
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_gtk_css_parser_error (parser, "Expected `left', `right' or comma");
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return FALSE;
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}
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side |= (1 << GTK_CSS_BOTTOM);
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}
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else
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break;
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}
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if (side == 0)
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{
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_gtk_css_parser_error (parser, "Expected side that gradient should go to");
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return FALSE;
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}
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_gtk_css_number_init (&linear->angle, side, GTK_CSS_NUMBER);
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if (!_gtk_css_parser_try (parser, ",", TRUE))
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{
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_gtk_css_parser_error (parser, "Expected a comma");
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return FALSE;
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}
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}
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else if (_gtk_css_parser_has_number (parser))
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{
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if (!_gtk_css_parser_read_number (parser,
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&linear->angle,
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GTK_CSS_PARSE_ANGLE))
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return FALSE;
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if (!_gtk_css_parser_try (parser, ",", TRUE))
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{
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_gtk_css_parser_error (parser, "Expected a comma");
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return FALSE;
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}
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}
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else
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_gtk_css_number_init (&linear->angle, 1 << GTK_CSS_BOTTOM, GTK_CSS_NUMBER);
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do {
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GtkCssImageLinearColorStop stop;
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stop.color.symbolic = _gtk_css_parser_read_symbolic_color (parser);
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if (stop.color.symbolic == NULL)
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return FALSE;
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if (_gtk_css_parser_has_number (parser))
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{
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if (!_gtk_css_parser_read_number (parser,
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&stop.offset,
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GTK_CSS_PARSE_PERCENT
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| GTK_CSS_PARSE_LENGTH))
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return FALSE;
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}
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else
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{
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/* use NUMBER to mark as unset number */
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_gtk_css_number_init (&stop.offset, 0, GTK_CSS_NUMBER);
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}
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g_array_append_val (linear->stops, stop);
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} while (_gtk_css_parser_try (parser, ",", TRUE));
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if (!_gtk_css_parser_try (parser, ")", TRUE))
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{
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_gtk_css_parser_error (parser, "Missing closing bracket at end of linear gradient");
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return FALSE;
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}
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return TRUE;
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}
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static void
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gtk_css_image_linear_print (GtkCssImage *image,
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GString *string)
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{
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GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (image);
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guint i;
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/* XXX: Do these need to be prinatable? */
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g_return_if_fail (!linear->is_computed);
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if (linear->repeating)
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g_string_append (string, "repeating-linear-gradient(");
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else
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g_string_append (string, "linear-gradient(");
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if (linear->angle.unit == GTK_CSS_NUMBER)
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{
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guint side = linear->angle.value;
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if (side != (1 << GTK_CSS_BOTTOM))
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{
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g_string_append (string, "to");
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if (side & (1 << GTK_CSS_TOP))
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g_string_append (string, " top");
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else if (side & (1 << GTK_CSS_BOTTOM))
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g_string_append (string, " bottom");
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if (side & (1 << GTK_CSS_LEFT))
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g_string_append (string, " left");
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else if (side & (1 << GTK_CSS_RIGHT))
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g_string_append (string, " right");
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g_string_append (string, ", ");
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}
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}
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else
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{
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_gtk_css_number_print (&linear->angle, string);
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g_string_append (string, ", ");
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}
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for (i = 0; i < linear->stops->len; i++)
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{
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GtkCssImageLinearColorStop *stop;
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char *s;
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if (i > 0)
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g_string_append (string, ", ");
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, i);
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s = gtk_symbolic_color_to_string (stop->color.symbolic);
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g_string_append (string, s);
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g_free (s);
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if (stop->offset.unit != GTK_CSS_NUMBER)
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{
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g_string_append (string, " ");
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_gtk_css_number_print (&stop->offset, string);
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}
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}
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g_string_append (string, ")");
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}
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static GtkCssImage *
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gtk_css_image_linear_compute (GtkCssImage *image,
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GtkStyleContext *context)
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{
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GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (image);
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GtkCssImageLinear *copy;
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guint i;
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if (linear->is_computed)
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return g_object_ref (linear);
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copy = g_object_new (GTK_TYPE_CSS_IMAGE_LINEAR, NULL);
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copy->is_computed = TRUE;
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copy->repeating = linear->repeating;
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_gtk_css_number_compute (©->angle, &linear->angle, context);
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g_array_set_size (copy->stops, linear->stops->len);
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for (i = 0; i < linear->stops->len; i++)
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{
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GtkCssImageLinearColorStop *stop, *scopy;
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, i);
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scopy = &g_array_index (copy->stops, GtkCssImageLinearColorStop, i);
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if (!_gtk_style_context_resolve_color (context,
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stop->color.symbolic,
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&scopy->color.rgba))
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{
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static const GdkRGBA transparent = { 0, 0, 0, 0 };
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scopy->color.rgba = transparent;
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}
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_gtk_css_number_compute (&scopy->offset, &stop->offset, context);
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}
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return GTK_CSS_IMAGE (copy);
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}
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static void
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gtk_css_image_linear_dispose (GObject *object)
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{
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GtkCssImageLinear *linear = GTK_CSS_IMAGE_LINEAR (object);
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if (linear->stops)
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{
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if (!linear->is_computed)
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{
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guint i;
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for (i = 0; i < linear->stops->len; i++)
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{
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GtkCssImageLinearColorStop *stop;
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stop = &g_array_index (linear->stops, GtkCssImageLinearColorStop, i);
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gtk_symbolic_color_unref (stop->color.symbolic);
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}
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}
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g_array_free (linear->stops, TRUE);
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linear->stops = NULL;
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}
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G_OBJECT_CLASS (_gtk_css_image_linear_parent_class)->dispose (object);
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}
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static void
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_gtk_css_image_linear_class_init (GtkCssImageLinearClass *klass)
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{
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GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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image_class->draw = gtk_css_image_linear_draw;
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image_class->parse = gtk_css_image_linear_parse;
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image_class->print = gtk_css_image_linear_print;
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image_class->compute = gtk_css_image_linear_compute;
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object_class->dispose = gtk_css_image_linear_dispose;
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}
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static void
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_gtk_css_image_linear_init (GtkCssImageLinear *linear)
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{
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linear->stops = g_array_new (FALSE, FALSE, sizeof (GtkCssImageLinearColorStop));
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_gtk_css_number_init (&linear->angle, 1 << GTK_CSS_BOTTOM, GTK_CSS_NUMBER);
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}
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