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PIKApp/libpikawidgets/pikacolorscale.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikacolorscale.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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libpikabase/pikabase.h"
#include "libpikaconfig/pikaconfig.h"
#include "libpikacolor/pikacolor.h"
#include "pikawidgetstypes.h"
#include "pikacairo-utils.h"
#include "pikacolorscale.h"
#include "pikawidgetsutils.h"
/**
* SECTION: pikacolorscale
* @title: PikaColorScale
* @short_description: Fancy colored sliders.
*
* Fancy colored sliders.
**/
enum
{
PROP_0,
PROP_CHANNEL
};
typedef struct _PikaLCH PikaLCH;
struct _PikaLCH
{
gdouble l, c, h, a;
};
struct _PikaColorScalePrivate
{
PikaColorConfig *config;
PikaColorTransform *transform;
guchar oog_color[3];
PikaColorSelectorChannel channel;
PikaRGB rgb;
PikaHSV hsv;
guchar *buf;
guint width;
guint height;
guint rowstride;
gboolean needs_render;
};
#define GET_PRIVATE(obj) (((PikaColorScale *) (obj))->priv)
static void pika_color_scale_dispose (GObject *object);
static void pika_color_scale_finalize (GObject *object);
static void pika_color_scale_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void pika_color_scale_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void pika_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean pika_color_scale_draw (GtkWidget *widget,
cairo_t *cr);
static void pika_color_scale_render (PikaColorScale *scale);
static void pika_color_scale_render_alpha (PikaColorScale *scale);
static void pika_color_scale_create_transform (PikaColorScale *scale);
static void pika_color_scale_destroy_transform (PikaColorScale *scale);
static void pika_color_scale_notify_config (PikaColorConfig *config,
const GParamSpec *pspec,
PikaColorScale *scale);
G_DEFINE_TYPE_WITH_PRIVATE (PikaColorScale, pika_color_scale, GTK_TYPE_SCALE)
#define parent_class pika_color_scale_parent_class
static const Babl *fish_rgb_to_lch = NULL;
static const Babl *fish_lch_to_rgb = NULL;
static void
pika_color_scale_class_init (PikaColorScaleClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->dispose = pika_color_scale_dispose;
object_class->finalize = pika_color_scale_finalize;
object_class->get_property = pika_color_scale_get_property;
object_class->set_property = pika_color_scale_set_property;
widget_class->size_allocate = pika_color_scale_size_allocate;
widget_class->draw = pika_color_scale_draw;
/**
* PikaColorScale:channel:
*
* The channel which is edited by the color scale.
*
* Since: 2.8
*/
g_object_class_install_property (object_class, PROP_CHANNEL,
g_param_spec_enum ("channel",
"Channel",
"The channel which is edited by the color scale",
PIKA_TYPE_COLOR_SELECTOR_CHANNEL,
PIKA_COLOR_SELECTOR_VALUE,
PIKA_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
gtk_widget_class_set_css_name (widget_class, "PikaColorScale");
fish_rgb_to_lch = babl_fish (babl_format ("R'G'B'A double"),
babl_format ("CIE LCH(ab) double"));
fish_lch_to_rgb = babl_fish (babl_format ("CIE LCH(ab) double"),
babl_format ("R'G'B' double"));
}
static void
pika_color_scale_init (PikaColorScale *scale)
{
PikaColorScalePrivate *priv;
GtkRange *range = GTK_RANGE (scale);
GtkCssProvider *css;
scale->priv = pika_color_scale_get_instance_private (scale);
priv = scale->priv;
gtk_widget_set_can_focus (GTK_WIDGET (scale), TRUE);
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);
priv->channel = PIKA_COLOR_SELECTOR_VALUE;
priv->needs_render = TRUE;
gtk_orientable_set_orientation (GTK_ORIENTABLE (range),
GTK_ORIENTATION_HORIZONTAL);
pika_rgba_set (&priv->rgb, 0.0, 0.0, 0.0, 1.0);
pika_rgb_to_hsv (&priv->rgb, &priv->hsv);
pika_widget_track_monitor (GTK_WIDGET (scale),
G_CALLBACK (pika_color_scale_destroy_transform),
NULL, NULL);
css = gtk_css_provider_new ();
gtk_css_provider_load_from_data (css,
"PikaColorScale {"
" padding: 2px 12px 2px 12px;"
" min-width: 24px;"
" min-height: 24px;"
"}\n"
"PikaColorScale contents trough {"
" min-width: 20px;"
" min-height: 20px;"
"}\n"
"PikaColorScale contents trough slider {"
" min-width: 12px;"
" min-height: 12px;"
" margin: -6px -6px -6px -6px;"
"}",
-1, NULL);
gtk_style_context_add_provider (gtk_widget_get_style_context (GTK_WIDGET (scale)),
GTK_STYLE_PROVIDER (css),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
g_object_unref (css);
}
static void
pika_color_scale_dispose (GObject *object)
{
PikaColorScale *scale = PIKA_COLOR_SCALE (object);
pika_color_scale_set_color_config (scale, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
pika_color_scale_finalize (GObject *object)
{
PikaColorScalePrivate *priv = GET_PRIVATE (object);
g_clear_pointer (&priv->buf, g_free);
priv->width = 0;
priv->height = 0;
priv->rowstride = 0;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
pika_color_scale_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
PikaColorScalePrivate *priv = GET_PRIVATE (object);
switch (property_id)
{
case PROP_CHANNEL:
g_value_set_enum (value, priv->channel);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_color_scale_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
PikaColorScale *scale = PIKA_COLOR_SCALE (object);
switch (property_id)
{
case PROP_CHANNEL:
pika_color_scale_set_channel (scale, g_value_get_enum (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
pika_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
PikaColorScalePrivate *priv = GET_PRIVATE (widget);
GtkRange *range = GTK_RANGE (widget);
GdkRectangle range_rect;
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
gtk_range_get_range_rect (range, &range_rect);
if (range_rect.width != priv->width ||
range_rect.height != priv->height)
{
priv->width = range_rect.width;
priv->height = range_rect.height;
priv->rowstride = priv->width * 4;
g_free (priv->buf);
priv->buf = g_new (guchar, priv->rowstride * priv->height);
priv->needs_render = TRUE;
}
}
static gboolean
pika_color_scale_draw (GtkWidget *widget,
cairo_t *cr)
{
PikaColorScale *scale = PIKA_COLOR_SCALE (widget);
PikaColorScalePrivate *priv = GET_PRIVATE (widget);
GtkRange *range = GTK_RANGE (widget);
GtkStyleContext *context = gtk_widget_get_style_context (widget);
GdkRectangle range_rect;
GdkRectangle area = { 0, };
cairo_surface_t *buffer;
gint slider_start;
gint slider_end;
gint slider_mid;
gint slider_size;
if (! priv->buf)
return FALSE;
gtk_range_get_range_rect (range, &range_rect);
gtk_range_get_slider_range (range, &slider_start, &slider_end);
slider_mid = slider_start + (slider_end - slider_start) / 2;
slider_size = 6;
if (priv->needs_render)
{
pika_color_scale_render (scale);
priv->needs_render = FALSE;
}
if (! priv->transform)
pika_color_scale_create_transform (scale);
if (priv->transform)
{
const Babl *format = babl_format ("cairo-RGB24");
guchar *buf = g_new (guchar, priv->rowstride * priv->height);
guchar *src = priv->buf;
guchar *dest = buf;
guint i;
for (i = 0; i < priv->height; i++)
{
pika_color_transform_process_pixels (priv->transform,
format, src,
format, dest,
priv->width);
src += priv->rowstride;
dest += priv->rowstride;
}
buffer = cairo_image_surface_create_for_data (buf,
CAIRO_FORMAT_RGB24,
priv->width,
priv->height,
priv->rowstride);
cairo_surface_set_user_data (buffer, NULL,
buf, (cairo_destroy_func_t) g_free);
}
else
{
buffer = cairo_image_surface_create_for_data (priv->buf,
CAIRO_FORMAT_RGB24,
priv->width,
priv->height,
priv->rowstride);
}
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
cairo_set_source_surface (cr, buffer,
range_rect.x, range_rect.y);
break;
case GTK_ORIENTATION_VERTICAL:
cairo_set_source_surface (cr, buffer,
range_rect.x, range_rect.y);
break;
}
cairo_surface_destroy (buffer);
if (! gtk_widget_is_sensitive (widget))
{
static cairo_pattern_t *pattern = NULL;
if (! pattern)
{
static const guchar stipple[] = { 0, 255, 0, 0,
255, 0, 0, 0 };
cairo_surface_t *surface;
gint stride;
stride = cairo_format_stride_for_width (CAIRO_FORMAT_A8, 2);
surface = cairo_image_surface_create_for_data ((guchar *) stipple,
CAIRO_FORMAT_A8,
2, 2, stride);
pattern = cairo_pattern_create_for_surface (surface);
cairo_surface_destroy (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT);
}
cairo_mask (cr, pattern);
}
else
{
cairo_paint (cr);
}
if (gtk_widget_has_focus (widget))
gtk_render_focus (context, cr,
0, 0,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
switch (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)))
{
case GTK_ORIENTATION_HORIZONTAL:
area.x = slider_mid - slider_size;
area.y = range_rect.y;
area.width = 2 * slider_size;
area.height = range_rect.height;
break;
case GTK_ORIENTATION_VERTICAL:
area.x = range_rect.x;
area.y = slider_mid - slider_size;
area.width = range_rect.width;
area.height = 2 * slider_size;
break;
}
if (gtk_widget_is_sensitive (widget))
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
else
cairo_set_source_rgb (cr, 0.2, 0.2, 0.2);
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 + slider_size);
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 + slider_size,
area.y + area.height / 2 + 0.5);
break;
}
cairo_close_path (cr);
cairo_fill (cr);
if (gtk_widget_is_sensitive (widget))
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
else
cairo_set_source_rgb (cr, 0.8, 0.8, 0.8);
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 - slider_size);
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 - slider_size,
area.y + area.height / 2 + 0.5);
break;
}
cairo_close_path (cr);
cairo_fill (cr);
return FALSE;
}
/**
* pika_color_scale_new:
* @orientation: the scale's orientation (horizontal or vertical)
* @channel: the scale's color channel
*
* Creates a new #PikaColorScale widget.
*
* Returns: a new #PikaColorScale widget
**/
GtkWidget *
pika_color_scale_new (GtkOrientation orientation,
PikaColorSelectorChannel channel)
{
PikaColorScale *scale = g_object_new (PIKA_TYPE_COLOR_SCALE,
"orientation", orientation,
"channel", channel,
NULL);
gtk_range_set_flippable (GTK_RANGE (scale),
orientation == GTK_ORIENTATION_HORIZONTAL);
return GTK_WIDGET (scale);
}
/**
* pika_color_scale_set_channel:
* @scale: a #PikaColorScale widget
* @channel: the new color channel
*
* Changes the color channel displayed by the @scale.
**/
void
pika_color_scale_set_channel (PikaColorScale *scale,
PikaColorSelectorChannel channel)
{
PikaColorScalePrivate *priv;
g_return_if_fail (PIKA_IS_COLOR_SCALE (scale));
priv = GET_PRIVATE (scale);
if (channel != priv->channel)
{
priv->channel = channel;
priv->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (scale));
g_object_notify (G_OBJECT (scale), "channel");
}
}
/**
* pika_color_scale_set_color:
* @scale: a #PikaColorScale widget
* @rgb: the new color as #PikaRGB
* @hsv: the new color as #PikaHSV
*
* Changes the color value of the @scale.
**/
void
pika_color_scale_set_color (PikaColorScale *scale,
const PikaRGB *rgb,
const PikaHSV *hsv)
{
PikaColorScalePrivate *priv;
g_return_if_fail (PIKA_IS_COLOR_SCALE (scale));
g_return_if_fail (rgb != NULL);
g_return_if_fail (hsv != NULL);
priv = GET_PRIVATE (scale);
priv->rgb = *rgb;
priv->hsv = *hsv;
priv->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (scale));
}
/**
* pika_color_scale_set_color_config:
* @scale: a #PikaColorScale widget.
* @config: a #PikaColorConfig object.
*
* Sets the color management configuration to use with this color scale.
*
* Since: 2.10
*/
void
pika_color_scale_set_color_config (PikaColorScale *scale,
PikaColorConfig *config)
{
PikaColorScalePrivate *priv;
g_return_if_fail (PIKA_IS_COLOR_SCALE (scale));
g_return_if_fail (config == NULL || PIKA_IS_COLOR_CONFIG (config));
priv = GET_PRIVATE (scale);
if (config != priv->config)
{
if (priv->config)
{
g_signal_handlers_disconnect_by_func (priv->config,
pika_color_scale_notify_config,
scale);
pika_color_scale_destroy_transform (scale);
}
g_set_object (&priv->config, config);
if (priv->config)
{
g_signal_connect (priv->config, "notify",
G_CALLBACK (pika_color_scale_notify_config),
scale);
pika_color_scale_notify_config (priv->config, NULL, 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
pika_color_scale_render (PikaColorScale *scale)
{
PikaColorScalePrivate *priv = GET_PRIVATE (scale);
GtkRange *range = GTK_RANGE (scale);
PikaRGB rgb;
PikaHSV hsv;
PikaLCH lch;
gint multiplier = 1;
guint x, y;
gdouble *channel_value = NULL; /* shut up compiler */
gboolean from_hsv = FALSE;
gboolean from_lch = FALSE;
gboolean invert;
guchar *buf;
guchar *d;
if ((buf = priv->buf) == NULL)
return;
if (priv->channel == PIKA_COLOR_SELECTOR_ALPHA)
{
pika_color_scale_render_alpha (scale);
return;
}
rgb = priv->rgb;
hsv = priv->hsv;
babl_process (fish_rgb_to_lch, &rgb, &lch, 1);
switch (priv->channel)
{
case PIKA_COLOR_SELECTOR_HUE: channel_value = &hsv.h; break;
case PIKA_COLOR_SELECTOR_SATURATION: channel_value = &hsv.s; break;
case PIKA_COLOR_SELECTOR_VALUE: channel_value = &hsv.v; break;
case PIKA_COLOR_SELECTOR_RED: channel_value = &rgb.r; break;
case PIKA_COLOR_SELECTOR_GREEN: channel_value = &rgb.g; break;
case PIKA_COLOR_SELECTOR_BLUE: channel_value = &rgb.b; break;
case PIKA_COLOR_SELECTOR_ALPHA: channel_value = &rgb.a; break;
case PIKA_COLOR_SELECTOR_LCH_LIGHTNESS: channel_value = &lch.l; break;
case PIKA_COLOR_SELECTOR_LCH_CHROMA: channel_value = &lch.c; break;
case PIKA_COLOR_SELECTOR_LCH_HUE: channel_value = &lch.h; break;
}
switch (priv->channel)
{
case PIKA_COLOR_SELECTOR_HUE:
case PIKA_COLOR_SELECTOR_SATURATION:
case PIKA_COLOR_SELECTOR_VALUE:
from_hsv = TRUE;
break;
case PIKA_COLOR_SELECTOR_LCH_LIGHTNESS:
multiplier = 100;
from_lch = TRUE;
break;
case PIKA_COLOR_SELECTOR_LCH_CHROMA:
multiplier = 200;
from_lch = TRUE;
break;
case PIKA_COLOR_SELECTOR_LCH_HUE:
multiplier = 360;
from_lch = 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 < priv->width; x++, d += 4)
{
gdouble value = (gdouble) x * multiplier / (gdouble) (priv->width - 1);
guchar r, g, b;
if (invert)
value = multiplier - value;
*channel_value = value;
if (from_hsv)
pika_hsv_to_rgb (&hsv, &rgb);
else if (from_lch)
babl_process (fish_lch_to_rgb, &lch, &rgb, 1);
if (rgb.r < 0.0 || rgb.r > 1.0 ||
rgb.g < 0.0 || rgb.g > 1.0 ||
rgb.b < 0.0 || rgb.b > 1.0)
{
r = priv->oog_color[0];
g = priv->oog_color[1];
b = priv->oog_color[2];
}
else
{
pika_rgb_get_uchar (&rgb, &r, &g, &b);
}
PIKA_CAIRO_RGB24_SET_PIXEL (d, r, g, b);
}
d = buf + priv->rowstride;
for (y = 1; y < priv->height; y++)
{
memcpy (d, buf, priv->rowstride);
d += priv->rowstride;
}
break;
case GTK_ORIENTATION_VERTICAL:
for (y = 0; y < priv->height; y++)
{
gdouble value = (gdouble) y * multiplier / (gdouble) (priv->height - 1);
guchar r, g, b;
if (invert)
value = multiplier - value;
*channel_value = value;
if (from_hsv)
pika_hsv_to_rgb (&hsv, &rgb);
else if (from_lch)
babl_process (fish_lch_to_rgb, &lch, &rgb, 1);
if (rgb.r < 0.0 || rgb.r > 1.0 ||
rgb.g < 0.0 || rgb.g > 1.0 ||
rgb.b < 0.0 || rgb.b > 1.0)
{
r = priv->oog_color[0];
g = priv->oog_color[1];
b = priv->oog_color[2];
}
else
{
pika_rgb_get_uchar (&rgb, &r, &g, &b);
}
for (x = 0, d = buf; x < priv->width; x++, d += 4)
{
PIKA_CAIRO_RGB24_SET_PIXEL (d, r, g, b);
}
buf += priv->rowstride;
}
break;
}
}
static void
pika_color_scale_render_alpha (PikaColorScale *scale)
{
PikaColorScalePrivate *priv = GET_PRIVATE (scale);
GtkRange *range = GTK_RANGE (scale);
PikaRGB rgb;
gboolean invert;
gdouble a;
guint x, y;
guchar *buf;
guchar *d, *l;
invert = should_invert (range);
buf = priv->buf;
rgb = priv->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 = (priv->height > PIKA_CHECK_SIZE_SM ?
buf + PIKA_CHECK_SIZE_SM * priv->rowstride : light);
for (x = 0, d = light, l = dark; x < priv->width; x++)
{
if ((x % PIKA_CHECK_SIZE_SM) == 0)
{
guchar *t;
t = d;
d = l;
l = t;
}
a = (gdouble) x / (gdouble) (priv->width - 1);
if (invert)
a = 1.0 - a;
PIKA_CAIRO_RGB24_SET_PIXEL (l,
(PIKA_CHECK_LIGHT +
(rgb.r - PIKA_CHECK_LIGHT) * a) * 255.999,
(PIKA_CHECK_LIGHT +
(rgb.g - PIKA_CHECK_LIGHT) * a) * 255.999,
(PIKA_CHECK_LIGHT +
(rgb.b - PIKA_CHECK_LIGHT) * a) * 255.999);
l += 4;
PIKA_CAIRO_RGB24_SET_PIXEL (d,
(PIKA_CHECK_DARK +
(rgb.r - PIKA_CHECK_DARK) * a) * 255.999,
(PIKA_CHECK_DARK +
(rgb.g - PIKA_CHECK_DARK) * a) * 255.999,
(PIKA_CHECK_DARK +
(rgb.b - PIKA_CHECK_DARK) * a) * 255.999);
d += 4;
}
for (y = 0, d = buf; y < priv->height; y++, d += priv->rowstride)
{
if (y == 0 || y == PIKA_CHECK_SIZE_SM)
continue;
if ((y / PIKA_CHECK_SIZE_SM) & 1)
memcpy (d, dark, priv->rowstride);
else
memcpy (d, light, priv->rowstride);
}
}
break;
case GTK_ORIENTATION_VERTICAL:
{
guchar light[4] = {0xff, 0xff, 0xff, 0xff};
guchar dark[4] = {0xff, 0xff, 0xff, 0xff};
for (y = 0, d = buf; y < priv->height; y++, d += priv->rowstride)
{
a = (gdouble) y / (gdouble) (priv->height - 1);
if (invert)
a = 1.0 - a;
PIKA_CAIRO_RGB24_SET_PIXEL (light,
(PIKA_CHECK_LIGHT +
(rgb.r - PIKA_CHECK_LIGHT) * a) * 255.999,
(PIKA_CHECK_LIGHT +
(rgb.g - PIKA_CHECK_LIGHT) * a) * 255.999,
(PIKA_CHECK_LIGHT +
(rgb.b - PIKA_CHECK_LIGHT) * a) * 255.999);
PIKA_CAIRO_RGB24_SET_PIXEL (dark,
(PIKA_CHECK_DARK +
(rgb.r - PIKA_CHECK_DARK) * a) * 255.999,
(PIKA_CHECK_DARK +
(rgb.g - PIKA_CHECK_DARK) * a) * 255.999,
(PIKA_CHECK_DARK +
(rgb.b - PIKA_CHECK_DARK) * a) * 255.999);
for (x = 0, l = d; x < priv->width; x++, l += 4)
{
if (((x / PIKA_CHECK_SIZE_SM) ^ (y / PIKA_CHECK_SIZE_SM)) & 1)
{
l[0] = light[0];
l[1] = light[1];
l[2] = light[2];
l[3] = light[3];
}
else
{
l[0] = dark[0];
l[1] = dark[1];
l[2] = dark[2];
l[3] = dark[3];
}
}
}
}
break;
}
}
static void
pika_color_scale_create_transform (PikaColorScale *scale)
{
PikaColorScalePrivate *priv = GET_PRIVATE (scale);
if (priv->config)
{
static PikaColorProfile *profile = NULL;
const Babl *format = babl_format ("cairo-RGB24");
if (G_UNLIKELY (! profile))
profile = pika_color_profile_new_rgb_srgb ();
priv->transform = pika_widget_get_color_transform (GTK_WIDGET (scale),
priv->config,
profile,
format,
format,
NULL,
PIKA_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
FALSE);
}
}
static void
pika_color_scale_destroy_transform (PikaColorScale *scale)
{
PikaColorScalePrivate *priv = GET_PRIVATE (scale);
if (priv->transform)
{
g_object_unref (priv->transform);
priv->transform = NULL;
}
gtk_widget_queue_draw (GTK_WIDGET (scale));
}
static void
pika_color_scale_notify_config (PikaColorConfig *config,
const GParamSpec *pspec,
PikaColorScale *scale)
{
PikaColorScalePrivate *priv = GET_PRIVATE (scale);
PikaRGB color;
pika_color_scale_destroy_transform (scale);
pika_color_config_get_out_of_gamut_color (config, &color);
pika_rgb_get_uchar (&color,
priv->oog_color,
priv->oog_color + 1,
priv->oog_color + 2);
priv->needs_render = TRUE;
}
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