/*
* Copyright © 2012 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see .
*
* Authors: Benjamin Otte
*/
#include "config.h"
#include "gtkcssimagebuiltinprivate.h"
#include "gtkcssenumvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkcssrgbavalueprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkhslaprivate.h"
#include
#include "fallback-c89.c"
G_DEFINE_TYPE (GtkCssImageBuiltin, gtk_css_image_builtin, GTK_TYPE_CSS_IMAGE)
static GtkCssImage *the_one_true_image;
static void
gtk_css_image_builtin_draw_check (GtkCssImage *image,
cairo_t *cr,
double width,
double height,
gboolean checked,
gboolean inconsistent)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
gint x, y, exterior_size, interior_size, pad;
exterior_size = MIN (width, height);
if (exterior_size % 2 == 0) /* Ensure odd */
exterior_size -= 1;
pad = 1 + MAX (1, (exterior_size - 2) / 9);
interior_size = MAX (1, exterior_size - 2 * pad);
if (interior_size < 7)
pad = MAX (0, (exterior_size - interior_size) / 2);
x = - (1 + exterior_size - (gint) width) / 2;
y = - (1 + exterior_size - (gint) height) / 2;
gdk_cairo_set_source_rgba (cr, &builtin->fg_color);
if (inconsistent)
{
int line_thickness = MAX (1, (3 + interior_size * 2) / 7);
cairo_rectangle (cr,
x + pad,
y + pad + (1 + interior_size - line_thickness) / 2,
interior_size,
line_thickness);
cairo_fill (cr);
}
else
{
if (checked)
{
cairo_save (cr);
cairo_translate (cr,
x + pad, y + pad);
cairo_scale (cr, interior_size / 7., interior_size / 7.);
cairo_rectangle (cr, 0, 0, 7, 7);
cairo_clip (cr);
cairo_move_to (cr, 7.0, 0.0);
cairo_line_to (cr, 7.5, 1.0);
cairo_curve_to (cr, 5.3, 2.0,
4.3, 4.0,
3.5, 7.0);
cairo_curve_to (cr, 3.0, 5.7,
1.3, 4.7,
0.0, 4.7);
cairo_line_to (cr, 0.2, 3.5);
cairo_curve_to (cr, 1.1, 3.5,
2.3, 4.3,
3.0, 5.0);
cairo_curve_to (cr, 1.0, 3.9,
2.4, 4.1,
3.2, 4.9);
cairo_curve_to (cr, 3.5, 3.1,
5.2, 2.0,
7.0, 0.0);
cairo_fill (cr);
cairo_restore (cr);
}
}
}
static void
gtk_css_image_builtin_draw_option (GtkCssImage *image,
cairo_t *cr,
double width,
double height,
gboolean checked,
gboolean inconsistent)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
gint x, y, exterior_size, interior_size, pad;
exterior_size = MIN (width, height);
if (exterior_size % 2 == 0) /* Ensure odd */
exterior_size -= 1;
x = - (1 + exterior_size - width) / 2;
y = - (1 + exterior_size - height) / 2;
gdk_cairo_set_source_rgba (cr, &builtin->fg_color);
pad = 1 + MAX (1, 2 * (exterior_size - 2) / 9);
interior_size = MAX (1, exterior_size - 2 * pad);
if (interior_size < 7)
pad = MAX (0, (exterior_size - interior_size) / 2);
if (inconsistent)
{
gint line_thickness;
line_thickness = MAX (1, (3 + interior_size * 2) / 7);
cairo_rectangle (cr,
x + pad,
y + pad + (interior_size - line_thickness) / 2.,
interior_size,
line_thickness);
cairo_fill (cr);
}
else if (checked)
{
cairo_new_sub_path (cr);
cairo_arc (cr,
x + pad + interior_size / 2.,
y + pad + interior_size / 2.,
interior_size / 2.,
0, 2 * G_PI);
cairo_fill (cr);
}
}
static void
gtk_css_image_builtin_draw_arrow (GtkCssImage *image,
cairo_t *cr,
double width,
double height,
GtkCssImageBuiltinType image_type)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
double line_width;
double size;
size = MIN (width, height);
cairo_translate (cr, width / 2.0, height / 2.0);
switch ((guint) image_type)
{
case GTK_CSS_IMAGE_BUILTIN_ARROW_UP:
break;
case GTK_CSS_IMAGE_BUILTIN_ARROW_DOWN:
cairo_rotate (cr, G_PI);
break;
case GTK_CSS_IMAGE_BUILTIN_ARROW_LEFT:
cairo_rotate (cr, 3 * G_PI / 2);
break;
case GTK_CSS_IMAGE_BUILTIN_ARROW_RIGHT:
cairo_rotate (cr, G_PI / 2);
break;
default:
g_assert_not_reached ();
break;
}
line_width = size / 3.0 / sqrt (2);
cairo_set_line_width (cr, line_width);
cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_scale (cr,
(size / (size + line_width)),
(size / (size + line_width)));
cairo_move_to (cr, -size / 2.0, size / 4.0);
cairo_rel_line_to (cr, size / 2.0, -size / 2.0);
cairo_rel_line_to (cr, size / 2.0, size / 2.0);
gdk_cairo_set_source_rgba (cr, &builtin->fg_color);
cairo_stroke (cr);
}
static void
gtk_css_image_builtin_draw_expander (GtkCssImage *image,
cairo_t *cr,
double width,
double height,
gboolean horizontal,
gboolean is_rtl,
gboolean expanded)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
double vertical_overshoot;
int diameter;
double radius;
double interp; /* interpolation factor for center position */
double x_double_horz, y_double_horz;
double x_double_vert, y_double_vert;
double x_double, y_double;
gdouble angle;
gint line_width;
gdouble progress;
line_width = 1;
progress = expanded ? 1 : 0;
if (!horizontal)
{
if (is_rtl)
angle = (G_PI) - ((G_PI / 2) * progress);
else
angle = (G_PI / 2) * progress;
}
else
{
if (is_rtl)
angle = (G_PI / 2) + ((G_PI / 2) * progress);
else
angle = (G_PI / 2) - ((G_PI / 2) * progress);
}
interp = progress;
/* Compute distance that the stroke extends beyonds the end
* of the triangle we draw.
*/
vertical_overshoot = line_width / 2.0 * (1. / tan (G_PI / 8));
/* For odd line widths, we end the vertical line of the triangle
* at a half pixel, so we round differently.
*/
if (line_width % 2 == 1)
vertical_overshoot = ceil (0.5 + vertical_overshoot) - 0.5;
else
vertical_overshoot = ceil (vertical_overshoot);
/* Adjust the size of the triangle we draw so that the entire stroke fits
*/
diameter = (gint) MAX (3, width - 2 * vertical_overshoot);
/* If the line width is odd, we want the diameter to be even,
* and vice versa, so force the sum to be odd. This relationship
* makes the point of the triangle look right.
*/
diameter -= (1 - (diameter + line_width) % 2);
radius = diameter / 2.;
/* Adjust the center so that the stroke is properly aligned with
* the pixel grid. The center adjustment is different for the
* horizontal and vertical orientations. For intermediate positions
* we interpolate between the two.
*/
x_double_vert = floor ((width / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
y_double_vert = (height / 2) - 0.5;
x_double_horz = (width / 2) - 0.5;
y_double_horz = floor ((height / 2) - (radius + line_width) / 2.) + (radius + line_width) / 2.;
x_double = x_double_vert * (1 - interp) + x_double_horz * interp;
y_double = y_double_vert * (1 - interp) + y_double_horz * interp;
cairo_translate (cr, x_double, y_double);
cairo_rotate (cr, angle);
cairo_move_to (cr, - radius / 2., - radius);
cairo_line_to (cr, radius / 2., 0);
cairo_line_to (cr, - radius / 2., radius);
cairo_close_path (cr);
cairo_set_line_width (cr, line_width);
gdk_cairo_set_source_rgba (cr, &builtin->fg_color);
cairo_fill (cr);
}
static void
color_shade (const GdkRGBA *color,
gdouble factor,
GdkRGBA *color_return)
{
GtkHSLA hsla;
_gtk_hsla_init_from_rgba (&hsla, color);
_gtk_hsla_shade (&hsla, &hsla, factor);
_gdk_rgba_init_from_hsla (color_return, &hsla);
}
static void
render_dot (cairo_t *cr,
const GdkRGBA *lighter,
const GdkRGBA *darker,
gdouble x,
gdouble y,
gdouble size)
{
size = CLAMP ((gint) size, 2, 3);
if (size == 2)
{
gdk_cairo_set_source_rgba (cr, lighter);
cairo_rectangle (cr, x, y, 1, 1);
cairo_rectangle (cr, x + 1, y + 1, 1, 1);
cairo_fill (cr);
}
else if (size == 3)
{
gdk_cairo_set_source_rgba (cr, lighter);
cairo_rectangle (cr, x, y, 2, 1);
cairo_rectangle (cr, x, y, 1, 2);
cairo_fill (cr);
gdk_cairo_set_source_rgba (cr, darker);
cairo_rectangle (cr, x + 1, y + 1, 2, 1);
cairo_rectangle (cr, x + 2, y, 1, 2);
cairo_fill (cr);
}
}
static void
gtk_css_image_builtin_draw_pane_separator (GtkCssImage *image,
cairo_t *cr,
double width,
double height)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
GdkRGBA lighter, darker;
gint xx, yy;
cairo_set_line_width (cr, 1.0);
color_shade (&builtin->bg_color, 0.7, &darker);
color_shade (&builtin->bg_color, 1.3, &lighter);
if (width > height)
for (xx = width / 2 - 15; xx <= width / 2 + 15; xx += 5)
render_dot (cr, &lighter, &darker, xx, height / 2 - 1, 3);
else
for (yy = height / 2 - 15; yy <= height / 2 + 15; yy += 5)
render_dot (cr, &lighter, &darker, width / 2 - 1, yy, 3);
}
static void
gtk_css_image_builtin_draw_handle (GtkCssImage *image,
cairo_t *cr,
double width,
double height)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
GdkRGBA lighter, darker;
gint xx, yy;
cairo_set_line_width (cr, 1.0);
color_shade (&builtin->bg_color, 0.7, &darker);
color_shade (&builtin->bg_color, 1.3, &lighter);
for (yy = 0; yy < height; yy += 3)
for (xx = 0; xx < width; xx += 6)
{
render_dot (cr, &lighter, &darker, xx, yy, 2);
render_dot (cr, &lighter, &darker, xx + 3, yy + 1, 2);
}
}
static void
gtk_css_image_builtin_draw_spinner (GtkCssImage *image,
cairo_t *cr,
double width,
double height)
{
GtkCssImageBuiltin *builtin = GTK_CSS_IMAGE_BUILTIN (image);
guint num_steps;
gdouble radius;
gdouble half;
gint i;
radius = MIN (width / 2, height / 2);
cairo_translate (cr, width / 2, height / 2);
num_steps = 12;
cairo_set_line_width (cr, 2.0);
half = num_steps / 2;
for (i = 0; i < num_steps; i++)
{
gint inset = 0.7 * radius;
/* transparency is a function of time and intial value */
gdouble t = 1.0 - (gdouble) i / num_steps;
gdouble xscale = - sin (i * G_PI / half);
gdouble yscale = - cos (i * G_PI / half);
cairo_move_to (cr,
(radius - inset) * xscale,
(radius - inset) * yscale);
cairo_line_to (cr,
radius * xscale,
radius * yscale);
cairo_set_source_rgba (cr,
builtin->fg_color.red,
builtin->fg_color.green,
builtin->fg_color.blue,
builtin->fg_color.alpha * t);
cairo_stroke (cr);
}
}
static void
gtk_css_image_builtin_real_snapshot (GtkCssImage *image,
GtkSnapshot *snapshot,
double width,
double height)
{
/* It's a builtin image, other code will draw things */
}
static gboolean
gtk_css_image_builtin_parse (GtkCssImage *image,
GtkCssParser *parser)
{
if (!gtk_css_parser_try_ident (parser, "builtin"))
{
gtk_css_parser_error_syntax (parser, "Expected 'builtin'");
return FALSE;
}
return TRUE;
}
static void
gtk_css_image_builtin_print (GtkCssImage *image,
GString *string)
{
g_string_append (string, "builtin");
}
static GtkCssImage *
gtk_css_image_builtin_compute (GtkCssImage *image,
guint property_id,
GtkStyleProvider *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssImageBuiltin *result;
result = g_object_new (GTK_TYPE_CSS_IMAGE_BUILTIN, NULL);
result->fg_color = *_gtk_css_rgba_value_get_rgba (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_COLOR));
result->bg_color = *_gtk_css_rgba_value_get_rgba (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_BACKGROUND_COLOR));
return GTK_CSS_IMAGE (result);
}
static gboolean
gtk_css_image_builtin_equal (GtkCssImage *image1,
GtkCssImage *image2)
{
GtkCssImageBuiltin *builtin1 = (GtkCssImageBuiltin *) image1;
GtkCssImageBuiltin *builtin2 = (GtkCssImageBuiltin *) image2;
return gdk_rgba_equal (&builtin1->fg_color, &builtin2->fg_color)
&& gdk_rgba_equal (&builtin1->bg_color, &builtin2->bg_color);
}
static void
gtk_css_image_builtin_dispose (GObject *object)
{
if (the_one_true_image == GTK_CSS_IMAGE (object))
the_one_true_image = NULL;
G_OBJECT_CLASS (gtk_css_image_builtin_parent_class)->dispose (object);
}
static void
gtk_css_image_builtin_class_init (GtkCssImageBuiltinClass *klass)
{
GtkCssImageClass *image_class = GTK_CSS_IMAGE_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
image_class->snapshot = gtk_css_image_builtin_real_snapshot;
image_class->parse = gtk_css_image_builtin_parse;
image_class->print = gtk_css_image_builtin_print;
image_class->compute = gtk_css_image_builtin_compute;
image_class->equal = gtk_css_image_builtin_equal;
object_class->dispose = gtk_css_image_builtin_dispose;
}
static void
gtk_css_image_builtin_init (GtkCssImageBuiltin *builtin)
{
/* white background */
builtin->bg_color.red = builtin->bg_color.green = builtin->bg_color.blue = builtin->bg_color.alpha = 1.0;
/* black foreground */
builtin->fg_color.alpha = 1.0;
}
GtkCssImage *
gtk_css_image_builtin_new (void)
{
if (the_one_true_image == NULL)
the_one_true_image = g_object_new (GTK_TYPE_CSS_IMAGE_BUILTIN, NULL);
else
g_object_ref (the_one_true_image);
return the_one_true_image;
}
void
gtk_css_image_builtin_draw (GtkCssImage *image,
cairo_t *cr,
double width,
double height,
GtkCssImageBuiltinType image_type)
{
if (!GTK_IS_CSS_IMAGE_BUILTIN (image))
{
_gtk_css_image_draw (image, cr, width, height);
return;
}
switch (image_type)
{
default:
g_assert_not_reached ();
break;
case GTK_CSS_IMAGE_BUILTIN_NONE:
break;
case GTK_CSS_IMAGE_BUILTIN_CHECK:
case GTK_CSS_IMAGE_BUILTIN_CHECK_INCONSISTENT:
gtk_css_image_builtin_draw_check (image, cr,
width, height,
image_type == GTK_CSS_IMAGE_BUILTIN_CHECK,
image_type == GTK_CSS_IMAGE_BUILTIN_CHECK_INCONSISTENT);
break;
case GTK_CSS_IMAGE_BUILTIN_OPTION:
case GTK_CSS_IMAGE_BUILTIN_OPTION_INCONSISTENT:
gtk_css_image_builtin_draw_option (image, cr,
width, height,
image_type == GTK_CSS_IMAGE_BUILTIN_OPTION,
image_type == GTK_CSS_IMAGE_BUILTIN_OPTION_INCONSISTENT);
break;
case GTK_CSS_IMAGE_BUILTIN_ARROW_UP:
case GTK_CSS_IMAGE_BUILTIN_ARROW_DOWN:
case GTK_CSS_IMAGE_BUILTIN_ARROW_LEFT:
case GTK_CSS_IMAGE_BUILTIN_ARROW_RIGHT:
gtk_css_image_builtin_draw_arrow (image, cr,
width, height,
image_type);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_HORIZONTAL_LEFT:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
TRUE, FALSE, FALSE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_VERTICAL_LEFT:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
FALSE, FALSE, FALSE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_HORIZONTAL_RIGHT:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
TRUE, TRUE, FALSE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_VERTICAL_RIGHT:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
FALSE, TRUE, FALSE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_HORIZONTAL_LEFT_EXPANDED:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
TRUE, FALSE, TRUE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_VERTICAL_LEFT_EXPANDED:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
FALSE, FALSE, TRUE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_HORIZONTAL_RIGHT_EXPANDED:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
TRUE, TRUE, TRUE);
break;
case GTK_CSS_IMAGE_BUILTIN_EXPANDER_VERTICAL_RIGHT_EXPANDED:
gtk_css_image_builtin_draw_expander (image, cr,
width, height,
FALSE, TRUE, TRUE);
break;
case GTK_CSS_IMAGE_BUILTIN_PANE_SEPARATOR:
gtk_css_image_builtin_draw_pane_separator (image, cr,
width, height);
break;
case GTK_CSS_IMAGE_BUILTIN_HANDLE:
gtk_css_image_builtin_draw_handle (image, cr,
width, height);
break;
case GTK_CSS_IMAGE_BUILTIN_SPINNER:
gtk_css_image_builtin_draw_spinner (image, cr,
width, height);
break;
}
}
void
gtk_css_image_builtin_snapshot (GtkCssImage *image,
GtkSnapshot *snapshot,
double width,
double height,
GtkCssImageBuiltinType image_type)
{
cairo_t *cr;
g_return_if_fail (GTK_IS_CSS_IMAGE (image));
g_return_if_fail (snapshot != NULL);
g_return_if_fail (width > 0);
g_return_if_fail (height > 0);
if (!GTK_IS_CSS_IMAGE_BUILTIN (image))
{
gtk_css_image_snapshot (image, snapshot, width, height);
return;
}
cr = gtk_snapshot_append_cairo (snapshot,
&GRAPHENE_RECT_INIT (0, 0, width, height));
gtk_css_image_builtin_draw (image, cr, width, height, image_type);
cairo_destroy (cr);
}