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gimp/libgimpwidgets/gimpcolorscale.c
Jehan 9833ebd0ee app, libgimpwidgets, modules: color selectors are now partly space-invaded. 
What this commit does is keep the same code logic while moving to
GeglColor. Yet it's not **really** space-invaded yet. What we need to do
now:

1. Take into account the image space, and this is what we must navigate
   through, in particular for various representations of RGB or HSV.
   I.e. that if the active image is in anyRGB, the RGB values shown must
   be within anyRGB. Right now, everything is still shown/used as sRGB
   (even though it's properly retrieved and transformed to the target
   space thanks to GeglColor).
2. Show space info to make things clear and explicit, by adding some
   label somewhere.
3. Allow to switch between image and softproof spaces, regarding
   out-of-gamut display. I.e. that while RGB/HSV must be shown within
   the image space (assuming it's anyRGB), we may want to show
   out-of-gamut area (pink areas) within the softproof space. This may
   mean adding a checkbox. Or maybe simply taking into account whether
   we are in softproof mode or not?
4. We can likely move off gimp_widget_get_color_transform() into using
   gimp_widget_get_render_space() for display drawing. We don't need any
   soft-proofing or black point compensation for any of these widgets so
   pure babl is fine. Indeed we want to show any in-gamut color
   correctly (and not transformed according to specific intents or
   through soft-proofing). We will take care of the proofing case with
   out-of-gamut area showing only.
5. In the various drawing functions, we should move to
   CAIRO_FORMAT_RGBA128F. The color selection area might be wide enough
   that it makes sense to be more accurate, especially as we are
   essentially showing color gradients in 1 or 2 directions in these
   various widgets.
2024-02-11 23:28:03 +01:00

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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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpconfig/gimpconfig.h"
#include "libgimpcolor/gimpcolor.h"
#include "gimpwidgetstypes.h"
#include "gimpcairo-utils.h"
#include "gimpcolorscale.h"
#include "gimpwidgetsutils.h"
/**
* SECTION: gimpcolorscale
* @title: GimpColorScale
* @short_description: Fancy colored sliders.
*
* Fancy colored sliders.
**/
enum
{
PROP_0,
PROP_CHANNEL
};
typedef struct _GimpLCH GimpLCH;
struct _GimpLCH
{
gdouble l, c, h, a;
};
struct _GimpColorScalePrivate
{
GimpColorConfig *config;
GimpColorTransform *transform;
guchar oog_color[3];
GimpColorSelectorChannel channel;
GeglColor *color;
guchar *buf;
guint width;
guint height;
guint rowstride;
gboolean needs_render;
};
#define GET_PRIVATE(obj) (((GimpColorScale *) (obj))->priv)
static void gimp_color_scale_dispose (GObject *object);
static void gimp_color_scale_finalize (GObject *object);
static void gimp_color_scale_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_color_scale_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_color_scale_draw (GtkWidget *widget,
cairo_t *cr);
static void gimp_color_scale_render (GimpColorScale *scale);
static void gimp_color_scale_render_alpha (GimpColorScale *scale);
static void gimp_color_scale_create_transform (GimpColorScale *scale);
static void gimp_color_scale_destroy_transform (GimpColorScale *scale);
static void gimp_color_scale_notify_config (GimpColorConfig *config,
const GParamSpec *pspec,
GimpColorScale *scale);
G_DEFINE_TYPE_WITH_PRIVATE (GimpColorScale, gimp_color_scale, GTK_TYPE_SCALE)
#define parent_class gimp_color_scale_parent_class
static const Babl *fish_rgb_to_lch = NULL;
static const Babl *fish_lch_to_rgb = NULL;
static const Babl *fish_hsv_to_rgb = NULL;
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->dispose = gimp_color_scale_dispose;
object_class->finalize = gimp_color_scale_finalize;
object_class->get_property = gimp_color_scale_get_property;
object_class->set_property = gimp_color_scale_set_property;
widget_class->size_allocate = gimp_color_scale_size_allocate;
widget_class->draw = gimp_color_scale_draw;
/**
* GimpColorScale: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",
GIMP_TYPE_COLOR_SELECTOR_CHANNEL,
GIMP_COLOR_SELECTOR_VALUE,
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
gtk_widget_class_set_css_name (widget_class, "GimpColorScale");
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"));
fish_hsv_to_rgb = babl_fish (babl_format ("HSV double"),
babl_format ("R'G'B' double"));
}
static void
gimp_color_scale_init (GimpColorScale *scale)
{
GimpColorScalePrivate *priv;
GtkRange *range = GTK_RANGE (scale);
GtkCssProvider *css;
scale->priv = gimp_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 = GIMP_COLOR_SELECTOR_VALUE;
priv->needs_render = TRUE;
gtk_orientable_set_orientation (GTK_ORIENTABLE (range),
GTK_ORIENTATION_HORIZONTAL);
priv->color = gegl_color_new ("black");
gimp_widget_track_monitor (GTK_WIDGET (scale),
G_CALLBACK (gimp_color_scale_destroy_transform),
NULL, NULL);
css = gtk_css_provider_new ();
gtk_css_provider_load_from_data (css,
"GimpColorScale {"
" padding: 2px 12px 2px 12px;"
" min-width: 24px;"
" min-height: 24px;"
"}\n"
"GimpColorScale contents trough {"
" min-width: 20px;"
" min-height: 20px;"
"}\n"
"GimpColorScale 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
gimp_color_scale_dispose (GObject *object)
{
GimpColorScale *scale = GIMP_COLOR_SCALE (object);
gimp_color_scale_set_color_config (scale, NULL);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_color_scale_finalize (GObject *object)
{
GimpColorScalePrivate *priv = GET_PRIVATE (object);
g_clear_pointer (&priv->buf, g_free);
priv->width = 0;
priv->height = 0;
priv->rowstride = 0;
g_object_unref (priv->color);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_color_scale_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpColorScalePrivate *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
gimp_color_scale_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpColorScale *scale = GIMP_COLOR_SCALE (object);
switch (property_id)
{
case PROP_CHANNEL:
gimp_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
gimp_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpColorScalePrivate *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
gimp_color_scale_draw (GtkWidget *widget,
cairo_t *cr)
{
GimpColorScale *scale = GIMP_COLOR_SCALE (widget);
GimpColorScalePrivate *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;
guchar *buf = NULL;
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)
{
gimp_color_scale_render (scale);
priv->needs_render = FALSE;
}
if (! priv->transform)
gimp_color_scale_create_transform (scale);
if (priv->transform)
{
const Babl *format = babl_format ("cairo-RGB24");
guchar *src = priv->buf;
guchar *dest = buf;
guint i;
buf = g_new (guchar, priv->rowstride * priv->height);
for (i = 0; i < priv->height; i++)
{
gimp_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;
}
/**
* gimp_color_scale_new:
* @orientation: the scale's orientation (horizontal or vertical)
* @channel: the scale's color channel
*
* Creates a new #GimpColorScale widget.
*
* Returns: a new #GimpColorScale widget
**/
GtkWidget *
gimp_color_scale_new (GtkOrientation orientation,
GimpColorSelectorChannel channel)
{
GimpColorScale *scale = g_object_new (GIMP_TYPE_COLOR_SCALE,
"orientation", orientation,
"channel", channel,
NULL);
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)
{
GimpColorScalePrivate *priv;
g_return_if_fail (GIMP_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");
}
}
/**
* gimp_color_scale_set_color:
* @scale: a #GimpColorScale widget
* @color: the new color.
*
* Changes the color value of the @scale.
**/
void
gimp_color_scale_set_color (GimpColorScale *scale,
GeglColor *color)
{
GimpColorScalePrivate *priv;
GeglColor *old_color;
g_return_if_fail (GIMP_IS_COLOR_SCALE (scale));
g_return_if_fail (GEGL_IS_COLOR (color));
priv = GET_PRIVATE (scale);
old_color = priv->color;
priv->color = gegl_color_duplicate (color);
if (! gimp_color_is_perceptually_identical (old_color, priv->color))
{
priv->needs_render = TRUE;
gtk_widget_queue_draw (GTK_WIDGET (scale));
}
g_object_unref (old_color);
}
/**
* gimp_color_scale_set_color_config:
* @scale: a #GimpColorScale widget.
* @config: a #GimpColorConfig object.
*
* Sets the color management configuration to use with this color scale.
*
* Since: 2.10
*/
void
gimp_color_scale_set_color_config (GimpColorScale *scale,
GimpColorConfig *config)
{
GimpColorScalePrivate *priv;
g_return_if_fail (GIMP_IS_COLOR_SCALE (scale));
g_return_if_fail (config == NULL || GIMP_IS_COLOR_CONFIG (config));
priv = GET_PRIVATE (scale);
if (config != priv->config)
{
if (priv->config)
{
g_signal_handlers_disconnect_by_func (priv->config,
gimp_color_scale_notify_config,
scale);
gimp_color_scale_destroy_transform (scale);
}
g_set_object (&priv->config, config);
if (priv->config)
{
g_signal_connect (priv->config, "notify",
G_CALLBACK (gimp_color_scale_notify_config),
scale);
gimp_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
gimp_color_scale_render (GimpColorScale *scale)
{
GimpColorScalePrivate *priv = GET_PRIVATE (scale);
GtkRange *range = GTK_RANGE (scale);
gdouble rgb[4];
gdouble hsv[3];
gdouble lch[3];
gint multiplier = 1;
guint x, y;
gdouble *channel_value = NULL;
gboolean from_hsv = FALSE;
gboolean from_lch = FALSE;
gboolean invert;
guchar *buf;
guchar *d;
if ((buf = priv->buf) == NULL)
return;
if (priv->channel == GIMP_COLOR_SELECTOR_ALPHA)
{
gimp_color_scale_render_alpha (scale);
return;
}
gegl_color_get_pixel (priv->color, babl_format ("R'G'B'A double"), rgb);
gegl_color_get_pixel (priv->color, babl_format ("HSV double"), hsv);
gegl_color_get_pixel (priv->color, babl_format ("CIE LCH(ab) double"), lch);
switch (priv->channel)
{
case GIMP_COLOR_SELECTOR_HUE: channel_value = &hsv[0]; break;
case GIMP_COLOR_SELECTOR_SATURATION: channel_value = &hsv[1]; break;
case GIMP_COLOR_SELECTOR_VALUE: channel_value = &hsv[2]; break;
case GIMP_COLOR_SELECTOR_RED: channel_value = &rgb[0]; break;
case GIMP_COLOR_SELECTOR_GREEN: channel_value = &rgb[1]; break;
case GIMP_COLOR_SELECTOR_BLUE: channel_value = &rgb[2]; break;
case GIMP_COLOR_SELECTOR_ALPHA: channel_value = &rgb[3]; break;
case GIMP_COLOR_SELECTOR_LCH_LIGHTNESS: channel_value = &lch[0]; break;
case GIMP_COLOR_SELECTOR_LCH_CHROMA: channel_value = &lch[1]; break;
case GIMP_COLOR_SELECTOR_LCH_HUE: channel_value = &lch[2]; break;
}
switch (priv->channel)
{
case GIMP_COLOR_SELECTOR_HUE:
case GIMP_COLOR_SELECTOR_SATURATION:
case GIMP_COLOR_SELECTOR_VALUE:
from_hsv = TRUE;
break;
case GIMP_COLOR_SELECTOR_LCH_LIGHTNESS:
multiplier = 100;
from_lch = TRUE;
break;
case GIMP_COLOR_SELECTOR_LCH_CHROMA:
multiplier = 200;
from_lch = TRUE;
break;
case GIMP_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 u8rgb[3];
if (invert)
value = multiplier - value;
*channel_value = value;
if (from_hsv)
babl_process (fish_hsv_to_rgb, &hsv, &rgb, 1);
else if (from_lch)
babl_process (fish_lch_to_rgb, &lch, &rgb, 1);
/* This is only checking if a color is within the sRGB gamut. I want
* to check compared to the image's space (anySpace) or softproof
* space. TODO.
*/
if (rgb[0] < 0.0 || rgb[0] > 1.0 ||
rgb[1] < 0.0 || rgb[1] > 1.0 ||
rgb[2] < 0.0 || rgb[2] > 1.0)
{
u8rgb[0] = priv->oog_color[0];
u8rgb[1] = priv->oog_color[1];
u8rgb[2] = priv->oog_color[2];
}
else
{
u8rgb[0] = rgb[0] * 255;
u8rgb[1] = rgb[1] * 255;
u8rgb[2] = rgb[2] * 255;
}
/* TODO: we should move to CAIRO_FORMAT_RGBA128F. */
GIMP_CAIRO_RGB24_SET_PIXEL (d, u8rgb[0], u8rgb[1], u8rgb[2]);
}
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 u8rgb[3];
if (invert)
value = multiplier - value;
*channel_value = value;
if (from_hsv)
babl_process (fish_hsv_to_rgb, &hsv, &rgb, 1);
else if (from_lch)
babl_process (fish_lch_to_rgb, &lch, &rgb, 1);
if (rgb[0] < 0.0 || rgb[0] > 1.0 ||
rgb[1] < 0.0 || rgb[1] > 1.0 ||
rgb[2] < 0.0 || rgb[2] > 1.0)
{
u8rgb[0] = priv->oog_color[0];
u8rgb[1] = priv->oog_color[1];
u8rgb[2] = priv->oog_color[2];
}
else
{
u8rgb[0] = rgb[0] * 255;
u8rgb[1] = rgb[1] * 255;
u8rgb[2] = rgb[2] * 255;
}
for (x = 0, d = buf; x < priv->width; x++, d += 4)
GIMP_CAIRO_RGB24_SET_PIXEL (d, u8rgb[0], u8rgb[1], u8rgb[2]);
buf += priv->rowstride;
}
break;
}
}
static void
gimp_color_scale_render_alpha (GimpColorScale *scale)
{
GimpColorScalePrivate *priv = GET_PRIVATE (scale);
GtkRange *range = GTK_RANGE (scale);
gdouble rgb[4];
gboolean invert;
gdouble a;
guint x, y;
guchar *buf;
guchar *d, *l;
invert = should_invert (range);
buf = priv->buf;
gegl_color_get_pixel (priv->color, babl_format ("R'G'B'A double"), 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 > GIMP_CHECK_SIZE_SM ?
buf + GIMP_CHECK_SIZE_SM * priv->rowstride : light);
for (x = 0, d = light, l = dark; x < priv->width; x++)
{
if ((x % GIMP_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;
GIMP_CAIRO_RGB24_SET_PIXEL (l,
(GIMP_CHECK_LIGHT +
(rgb[0] - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb[1] - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb[2] - GIMP_CHECK_LIGHT) * a) * 255.999);
l += 4;
GIMP_CAIRO_RGB24_SET_PIXEL (d,
(GIMP_CHECK_DARK +
(rgb[0] - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb[1] - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb[2] - GIMP_CHECK_DARK) * a) * 255.999);
d += 4;
}
for (y = 0, d = buf; y < priv->height; y++, d += priv->rowstride)
{
if (y == 0 || y == GIMP_CHECK_SIZE_SM)
continue;
if ((y / GIMP_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;
GIMP_CAIRO_RGB24_SET_PIXEL (light,
(GIMP_CHECK_LIGHT +
(rgb[0] - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb[1] - GIMP_CHECK_LIGHT) * a) * 255.999,
(GIMP_CHECK_LIGHT +
(rgb[2] - GIMP_CHECK_LIGHT) * a) * 255.999);
GIMP_CAIRO_RGB24_SET_PIXEL (dark,
(GIMP_CHECK_DARK +
(rgb[0] - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb[1] - GIMP_CHECK_DARK) * a) * 255.999,
(GIMP_CHECK_DARK +
(rgb[2] - GIMP_CHECK_DARK) * a) * 255.999);
for (x = 0, l = d; x < priv->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[3] = light[3];
}
else
{
l[0] = dark[0];
l[1] = dark[1];
l[2] = dark[2];
l[3] = dark[3];
}
}
}
}
break;
}
}
static void
gimp_color_scale_create_transform (GimpColorScale *scale)
{
GimpColorScalePrivate *priv = GET_PRIVATE (scale);
if (priv->config)
{
static GimpColorProfile *profile = NULL;
const Babl *format = babl_format ("cairo-RGB24");
if (G_UNLIKELY (! profile))
profile = gimp_color_profile_new_rgb_srgb ();
priv->transform = gimp_widget_get_color_transform (GTK_WIDGET (scale),
priv->config,
profile,
format,
format,
NULL,
GIMP_COLOR_RENDERING_INTENT_RELATIVE_COLORIMETRIC,
FALSE);
}
}
static void
gimp_color_scale_destroy_transform (GimpColorScale *scale)
{
GimpColorScalePrivate *priv = GET_PRIVATE (scale);
if (priv->transform)
{
g_object_unref (priv->transform);
priv->transform = NULL;
}
gtk_widget_queue_draw (GTK_WIDGET (scale));
}
static void
gimp_color_scale_notify_config (GimpColorConfig *config,
const GParamSpec *pspec,
GimpColorScale *scale)
{
GimpColorScalePrivate *priv = GET_PRIVATE (scale);
GeglColor *color;
gimp_color_scale_destroy_transform (scale);
color = gimp_color_config_get_out_of_gamut_color (config);
/* TODO: shouldn't this be color-managed too, using the target space into
* consideration?
*/
gegl_color_get_pixel (color, babl_format ("R'G'B' u8"), priv->oog_color);
priv->needs_render = TRUE;
g_object_unref (color);
}
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