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gimp/libgimpwidgets/gimpcolorscale.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpcolorscale.c
* Copyright (C) 2002-2010 Sven Neumann <sven@gimp.org>
* Michael Natterer <mitch@gimp.org>
*
* 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 3 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
* Library 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
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimpcairo-utils.h"
#include "gimpcolorscale.h"
/**
* SECTION: gimpcolorscale
* @title: GimpColorScale
* @short_description: Fancy colored sliders.
*
* Fancy colored sliders.
**/
static void gimp_color_scale_finalize (GObject *object);
static void gimp_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static void gimp_color_scale_state_changed (GtkWidget *widget,
GtkStateType previous_state);
static gboolean gimp_color_scale_button_press (GtkWidget *widget,
GdkEventButton *event);
static gboolean gimp_color_scale_button_release (GtkWidget *widget,
GdkEventButton *event);
static gboolean gimp_color_scale_expose (GtkWidget *widget,
GdkEventExpose *event);
static void gimp_color_scale_render (GimpColorScale *scale);
static void gimp_color_scale_render_alpha (GimpColorScale *scale);
static void gimp_color_scale_render_stipple (GimpColorScale *scale);
G_DEFINE_TYPE (GimpColorScale, gimp_color_scale, GTK_TYPE_SCALE)
#define parent_class gimp_color_scale_parent_class
static void
gimp_color_scale_class_init (GimpColorScaleClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->finalize = gimp_color_scale_finalize;
widget_class->size_allocate = gimp_color_scale_size_allocate;
widget_class->state_changed = gimp_color_scale_state_changed;
widget_class->button_press_event = gimp_color_scale_button_press;
widget_class->button_release_event = gimp_color_scale_button_release;
widget_class->expose_event = gimp_color_scale_expose;
}
static void
gimp_color_scale_init (GimpColorScale *scale)
{
GtkRange *range = GTK_RANGE (scale);
gtk_range_set_slider_size_fixed (range, TRUE);
gtk_range_set_flippable (GTK_RANGE (scale), TRUE);
gtk_scale_set_draw_value (GTK_SCALE (scale), FALSE);
scale->channel = GIMP_COLOR_SELECTOR_VALUE;
scale->needs_render = TRUE;
gtk_orientable_set_orientation (GTK_ORIENTABLE (range),
GTK_ORIENTATION_HORIZONTAL);
gimp_rgba_set (&scale->rgb, 0.0, 0.0, 0.0, 1.0);
gimp_rgb_to_hsv (&scale->rgb, &scale->hsv);
}
static void
gimp_color_scale_finalize (GObject *object)
{
GimpColorScale *scale = GIMP_COLOR_SCALE (object);
if (scale->buf)
{
g_free (scale->buf);
scale->buf = NULL;
scale->width = 0;
scale->height = 0;
scale->rowstride = 0;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpColorScale *scale = GIMP_COLOR_SCALE (widget);
GtkRange *range = GTK_RANGE (widget);
GdkRectangle range_rect;
gint focus = 0;
gint trough_border;
gint scale_width;
gint scale_height;
gtk_widget_style_get (widget,
"trough-border", &trough_border,
NULL);
if (gtk_widget_get_can_focus (widget))
{
gint focus_padding = 0;
gtk_widget_style_get (widget,
"focus-line-width", &focus,
"focus-padding", &focus_padding,
NULL);
focus += focus_padding;
}
gtk_range_set_min_slider_size (range,
(MIN (allocation->width,
allocation->height) - 2 * focus) / 2);
if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
gtk_range_get_range_rect (range, &range_rect);
scale_width = range_rect.width - 2 * (focus + trough_border);
scale_height = range_rect.height - 2 * (focus + trough_border);
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
scale_width -= gtk_range_get_min_slider_size (range) - 1;
scale_height -= 2;
break;
case GTK_ORIENTATION_VERTICAL:
scale_width -= 2;
scale_height -= gtk_range_get_min_slider_size (range) - 1;
break;
}
if (scale_width != scale->width || scale_height != scale->height)
{
scale->width = scale_width;
scale->height = scale_height;
scale->rowstride = scale->width * 4;
g_free (scale->buf);
scale->buf = g_new (guchar, scale->rowstride * scale->height);
scale->needs_render = TRUE;
}
}
static void
gimp_color_scale_state_changed (GtkWidget *widget,
GtkStateType previous_state)
{
if (gtk_widget_get_state (widget) == GTK_STATE_INSENSITIVE ||
previous_state == GTK_STATE_INSENSITIVE)
{
GIMP_COLOR_SCALE (widget)->needs_render = TRUE;
}
if (GTK_WIDGET_CLASS (parent_class)->state_changed)
GTK_WIDGET_CLASS (parent_class)->state_changed (widget, previous_state);
}
static gboolean
gimp_color_scale_button_press (GtkWidget *widget,
GdkEventButton *event)
{
if (event->button == 1)
{
GdkEventButton *my_event;
gboolean retval;
my_event = (GdkEventButton *) gdk_event_copy ((GdkEvent *) event);
my_event->button = 2;
retval = GTK_WIDGET_CLASS (parent_class)->button_press_event (widget,
my_event);
gdk_event_free ((GdkEvent *) my_event);
return retval;
}
return GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, event);
}
static gboolean
gimp_color_scale_button_release (GtkWidget *widget,
GdkEventButton *event)
{
if (event->button == 1)
{
GdkEventButton *my_event;
gboolean retval;
my_event = (GdkEventButton *) gdk_event_copy ((GdkEvent *) event);
my_event->button = 2;
retval = GTK_WIDGET_CLASS (parent_class)->button_release_event (widget,
my_event);
gdk_event_free ((GdkEvent *) my_event);
return retval;
}
return GTK_WIDGET_CLASS (parent_class)->button_release_event (widget, event);
}
static gboolean
gimp_color_scale_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpColorScale *scale = GIMP_COLOR_SCALE (widget);
GtkRange *range = GTK_RANGE (widget);
GtkStyle *style = gtk_widget_get_style (widget);
GdkWindow *window = gtk_widget_get_window (widget);
gboolean sensitive = gtk_widget_is_sensitive (widget);
GtkAllocation allocation;
GdkRectangle range_rect;
GdkRectangle area = { 0, };
cairo_surface_t *buffer;
gint focus = 0;
gint trough_border;
gint slider_start;
gint slider_size;
gint x, y;
gint w, h;
cairo_t *cr;
if (! scale->buf || ! gtk_widget_is_drawable (widget))
return FALSE;
gtk_widget_get_allocation (widget, &allocation);
cr = gdk_cairo_create (window);
gdk_cairo_region (cr, event->region);
cairo_translate (cr, allocation.x, allocation.y);
cairo_clip (cr);
gtk_widget_style_get (widget,
"trough-border", &trough_border,
NULL);
if (gtk_widget_get_can_focus (widget))
{
gint focus_padding = 0;
gtk_widget_style_get (widget,
"focus-line-width", &focus,
"focus-padding", &focus_padding,
NULL);
focus += focus_padding;
}
gtk_range_get_range_rect (range, &range_rect);
gtk_range_get_slider_range (range, &slider_start, NULL);
x = range_rect.x + focus;
y = range_rect.y + focus;
w = range_rect.width - 2 * focus;
h = range_rect.height - 2 * focus;
slider_size = gtk_range_get_min_slider_size (range) / 2;
if (scale->needs_render)
{
gimp_color_scale_render (scale);
if (! sensitive)
gimp_color_scale_render_stipple (scale);
scale->needs_render = FALSE;
}
gtk_paint_box (style, window,
sensitive ? GTK_STATE_ACTIVE : GTK_STATE_INSENSITIVE,
GTK_SHADOW_IN,
&event->area, widget, "trough",
x + allocation.x,
y + allocation.y,
w, h);
buffer = cairo_image_surface_create_for_data (scale->buf,
CAIRO_FORMAT_RGB24,
scale->width,
scale->height,
scale->rowstride);
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
cairo_set_source_surface (cr, buffer,
x + trough_border + slider_size,
y + trough_border + 1);
break;
case GTK_ORIENTATION_VERTICAL:
cairo_set_source_surface (cr, buffer,
x + trough_border + 1,
y + trough_border + slider_size);
break;
}
cairo_surface_destroy (buffer);
cairo_paint (cr);
if (gtk_widget_has_focus (widget))
gtk_paint_focus (style, window, gtk_widget_get_state (widget),
&event->area, widget, "trough",
range_rect.x + allocation.x,
range_rect.y + allocation.y,
range_rect.width,
range_rect.height);
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
area.x = slider_start;
area.y = y + trough_border;
area.width = 2 * slider_size + 1;
area.height = h - 2 * trough_border;
break;
case GTK_ORIENTATION_VERTICAL:
area.x = x + trough_border;
area.y = slider_start;
area.width = w - 2 * trough_border;
area.height = 2 * slider_size + 1;
break;
}
if (gtk_widget_is_sensitive (widget))
gdk_cairo_set_source_color (cr, &style->black);
else
gdk_cairo_set_source_color (cr, &style->dark[GTK_STATE_INSENSITIVE]);
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
cairo_move_to (cr, area.x, area.y);
cairo_line_to (cr, area.x + area.width, area.y);
cairo_line_to (cr,
area.x + area.width / 2 + 0.5,
area.y + area.width / 2);
break;
case GTK_ORIENTATION_VERTICAL:
cairo_move_to (cr, area.x, area.y);
cairo_line_to (cr, area.x, area.y + area.height);
cairo_line_to (cr,
area.x + area.height / 2,
area.y + area.height / 2 + 0.5);
break;
}
cairo_close_path (cr);
cairo_fill (cr);
if (gtk_widget_is_sensitive (widget))
gdk_cairo_set_source_color (cr, &style->white);
else
gdk_cairo_set_source_color (cr, &style->light[GTK_STATE_INSENSITIVE]);
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
cairo_move_to (cr, area.x, area.y + area.height);
cairo_line_to (cr, area.x + area.width, area.y + area.height);
cairo_line_to (cr,
area.x + area.width / 2 + 0.5,
area.y + area.height - area.width / 2);
break;
case GTK_ORIENTATION_VERTICAL:
cairo_move_to (cr, area.x + area.width, area.y);
cairo_line_to (cr, area.x + area.width, area.y + area.height);
cairo_line_to (cr,
area.x + area.width - area.height / 2,
area.y + area.height / 2 + 0.5);
break;
}
cairo_close_path (cr);
cairo_fill (cr);
cairo_destroy (cr);
return FALSE;
}
/**
* gimp_color_scale_new:
* @orientation: the scale's orientation (horizontal or vertical)
* @channel: the scale's color channel
*
* Creates a new #GimpColorScale widget.
*
* Return value: a new #GimpColorScale widget
**/
GtkWidget *
gimp_color_scale_new (GtkOrientation orientation,
GimpColorSelectorChannel channel)
{
GimpColorScale *scale = g_object_new (GIMP_TYPE_COLOR_SCALE,
"orientation", orientation,
NULL);
scale->channel = channel;
gtk_range_set_flippable (GTK_RANGE (scale),
orientation == GTK_ORIENTATION_HORIZONTAL);
return GTK_WIDGET (scale);
}
/**
* gimp_color_scale_set_channel:
* @scale: a #GimpColorScale widget
* @channel: the new color channel
*
* Changes the color channel displayed by the @scale.
**/
void
gimp_color_scale_set_channel (GimpColorScale *scale,
GimpColorSelectorChannel channel)
{
g_return_if_fail (GIMP_IS_COLOR_SCALE (scale));
if (channel != scale->channel)
{
scale->channel = channel;
scale->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (scale));
}
}
/**
* gimp_color_scale_set_color:
* @scale: a #GimpColorScale widget
* @rgb: the new color as #GimpRGB
* @hsv: the new color as #GimpHSV
*
* Changes the color value of the @scale.
**/
void
gimp_color_scale_set_color (GimpColorScale *scale,
const GimpRGB *rgb,
const GimpHSV *hsv)
{
g_return_if_fail (GIMP_IS_COLOR_SCALE (scale));
g_return_if_fail (rgb != NULL);
g_return_if_fail (hsv != NULL);
scale->rgb = *rgb;
scale->hsv = *hsv;
scale->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (scale));
}
/* as in gtkrange.c */
static gboolean
should_invert (GtkRange *range)
{
gboolean inverted = gtk_range_get_inverted (range);
gboolean flippable = gtk_range_get_flippable (range);
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) ==
GTK_ORIENTATION_HORIZONTAL)
{
return
(inverted && !flippable) ||
(inverted && flippable &&
gtk_widget_get_direction (GTK_WIDGET (range)) == GTK_TEXT_DIR_LTR) ||
(!inverted && flippable &&
gtk_widget_get_direction (GTK_WIDGET (range)) == GTK_TEXT_DIR_RTL);
}
else
{
return inverted;
}
}
static void
gimp_color_scale_render (GimpColorScale *scale)
{
GtkRange *range = GTK_RANGE (scale);
GimpRGB rgb;
GimpHSV hsv;
guint x, y;
gdouble *channel_value = NULL; /* shut up compiler */
gboolean to_rgb = FALSE;
gboolean invert;
guchar *buf;
guchar *d;
if ((buf = scale->buf) == NULL)
return;
if (scale->channel == GIMP_COLOR_SELECTOR_ALPHA)
{
gimp_color_scale_render_alpha (scale);
return;
}
rgb = scale->rgb;
hsv = scale->hsv;
switch (scale->channel)
{
case GIMP_COLOR_SELECTOR_HUE: channel_value = &hsv.h; break;
case GIMP_COLOR_SELECTOR_SATURATION: channel_value = &hsv.s; break;
case GIMP_COLOR_SELECTOR_VALUE: channel_value = &hsv.v; break;
case GIMP_COLOR_SELECTOR_RED: channel_value = &rgb.r; break;
case GIMP_COLOR_SELECTOR_GREEN: channel_value = &rgb.g; break;
case GIMP_COLOR_SELECTOR_BLUE: channel_value = &rgb.b; break;
case GIMP_COLOR_SELECTOR_ALPHA: channel_value = &rgb.a; break;
}
switch (scale->channel)
{
case GIMP_COLOR_SELECTOR_HUE:
case GIMP_COLOR_SELECTOR_SATURATION:
case GIMP_COLOR_SELECTOR_VALUE:
to_rgb = TRUE;
break;
default:
break;
}
invert = should_invert (range);
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
for (x = 0, d = buf; x < scale->width; x++, d += 4)
{
gdouble value = (gdouble) x / (gdouble) (scale->width - 1);
guchar r, g, b;
if (invert)
value = 1.0 - value;
*channel_value = value;
if (to_rgb)
gimp_hsv_to_rgb (&hsv, &rgb);
gimp_rgb_get_uchar (&rgb, &r, &g, &b);
GIMP_CAIRO_RGB24_SET_PIXEL (d, r, g, b);
}
d = buf + scale->rowstride;
for (y = 1; y < scale->height; y++)
{
memcpy (d, buf, scale->rowstride);
d += scale->rowstride;
}
break;
case GTK_ORIENTATION_VERTICAL:
for (y = 0; y < scale->height; y++)
{
gdouble value = (gdouble) y / (gdouble) (scale->height - 1);
guchar r, g, b;
if (invert)
value = 1.0 - value;
*channel_value = value;
if (to_rgb)
gimp_hsv_to_rgb (&hsv, &rgb);
gimp_rgb_get_uchar (&rgb, &r, &g, &b);
for (x = 0, d = buf; x < scale->width; x++, d += 4)
{
GIMP_CAIRO_RGB24_SET_PIXEL (d, r, g, b);
}
buf += scale->rowstride;
}
break;
}
}
static void
gimp_color_scale_render_alpha (GimpColorScale *scale)
{
GtkRange *range = GTK_RANGE (scale);
GimpRGB rgb;
gboolean invert;
gdouble a;
guint x, y;
guchar *buf;
guchar *d, *l;
invert = should_invert (range);
buf = scale->buf;
rgb = scale->rgb;
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
{
guchar *light;
guchar *dark;
light = buf;
/* this won't work correctly for very thin scales */
dark = (scale->height > GIMP_CHECK_SIZE_SM ?
buf + GIMP_CHECK_SIZE_SM * scale->rowstride : light);
for (x = 0, d = light, l = dark; x < scale->width; x++)
{
if ((x % GIMP_CHECK_SIZE_SM) == 0)
{
guchar *t;
t = d;
d = l;
l = t;
}
a = (gdouble) x / (gdouble) (scale->width - 1);
if (invert)
a = 1.0 - a;
GIMP_CAIRO_RGB24_SET_PIXEL (l,
(GIMP_CHECK_LIGHT +
(rgb.r - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb.g - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb.b - GIMP_CHECK_LIGHT) * a) * 255.999);
l += 4;
GIMP_CAIRO_RGB24_SET_PIXEL (d,
(GIMP_CHECK_DARK +
(rgb.r - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb.g - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb.b - GIMP_CHECK_DARK) * a) * 255.999);
d += 4;
}
for (y = 0, d = buf; y < scale->height; y++, d += scale->rowstride)
{
if (y == 0 || y == GIMP_CHECK_SIZE_SM)
continue;
if ((y / GIMP_CHECK_SIZE_SM) & 1)
memcpy (d, dark, scale->rowstride);
else
memcpy (d, light, scale->rowstride);
}
}
break;
case GTK_ORIENTATION_VERTICAL:
{
guchar light[4];
guchar dark[4];
for (y = 0, d = buf; y < scale->height; y++, d += scale->rowstride)
{
a = (gdouble) y / (gdouble) (scale->height - 1);
if (invert)
a = 1.0 - a;
GIMP_CAIRO_RGB24_SET_PIXEL (light,
(GIMP_CHECK_LIGHT +
(rgb.r - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb.g - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb.b - GIMP_CHECK_LIGHT) * a) * 255.999);
GIMP_CAIRO_RGB24_SET_PIXEL (dark,
(GIMP_CHECK_DARK +
(rgb.r - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb.g - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb.b - GIMP_CHECK_DARK) * a) * 255.999);
for (x = 0, l = d; x < scale->width; x++, l += 4)
{
if (((x / GIMP_CHECK_SIZE_SM) ^ (y / GIMP_CHECK_SIZE_SM)) & 1)
{
l[0] = light[0];
l[1] = light[1];
l[2] = light[2];
l[2] = light[3];
}
else
{
l[0] = dark[0];
l[1] = dark[1];
l[2] = dark[2];
l[3] = dark[3];
}
}
}
}
break;
}
}
/*
* This could be integrated into the render functions which might be
* slightly faster. But we trade speed for keeping the code simple.
*/
static void
gimp_color_scale_render_stipple (GimpColorScale *scale)
{
GtkWidget *widget = GTK_WIDGET (scale);
GtkStyle *style = gtk_widget_get_style (widget);
guchar *buf;
guchar insensitive[4];
guint x, y;
if ((buf = scale->buf) == NULL)
return;
GIMP_CAIRO_RGB24_SET_PIXEL (insensitive,
style->bg[GTK_STATE_INSENSITIVE].red >> 8,
style->bg[GTK_STATE_INSENSITIVE].green >> 8,
style->bg[GTK_STATE_INSENSITIVE].blue >> 8);
for (y = 0; y < scale->height; y++, buf += scale->rowstride)
{
guchar *d = buf + 4 * (y % 2);
for (x = 0; x < scale->width - (y % 2); x += 2, d += 8)
{
d[0] = insensitive[0];
d[1] = insensitive[1];
d[2] = insensitive[2];
d[3] = insensitive[3];
}
}
}
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