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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 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 2 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include <gtk/gtk.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpbase/gimpbase.h"
#include "gimpwidgetstypes.h"
#include "gimpcolorscale.h"
#define SHADOW 1
static void gimp_color_scale_class_init (GimpColorScaleClass *klass);
static void gimp_color_scale_init (GimpColorScale *scale);
static void gimp_color_scale_destroy (GtkObject *object);
static void gimp_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
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 GtkScaleClass * parent_class = NULL;
GType
gimp_color_scale_get_type (void)
{
static GType scale_type = 0;
if (! scale_type)
{
static const GTypeInfo scale_info =
{
sizeof (GimpColorScaleClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_color_scale_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpColorScale),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_color_scale_init,
};
scale_type = g_type_register_static (GTK_TYPE_SCALE,
"GimpColorScale", &scale_info, 0);
}
return scale_type;
}
static void
gimp_color_scale_class_init (GimpColorScaleClass *klass)
{
GtkObjectClass *object_class;
GtkWidgetClass *widget_class;
parent_class = g_type_class_peek_parent (klass);
object_class = GTK_OBJECT_CLASS (klass);
widget_class = GTK_WIDGET_CLASS (klass);
object_class->destroy = gimp_color_scale_destroy;
widget_class->size_allocate = gimp_color_scale_size_allocate;
widget_class->expose_event = gimp_color_scale_expose;
}
static void
gimp_color_scale_init (GimpColorScale *scale)
{
GtkRange *range = GTK_RANGE (scale);
GTK_SCALE (scale)->draw_value = FALSE;
range->slider_size_fixed = TRUE;
range->orientation = GTK_ORIENTATION_HORIZONTAL;
range->flippable = TRUE;
/* range->update_policy = GTK_UPDATE_DELAYED; */
scale->channel = GIMP_COLOR_SELECTOR_VALUE;
scale->needs_render = TRUE;
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_destroy (GtkObject *object)
{
GimpColorScale *scale;
scale = GIMP_COLOR_SCALE (object);
if (scale->buf)
{
g_free (scale->buf);
scale->buf = NULL;
scale->width = 0;
scale->height = 0;
scale->rowstride = 0;
}
GTK_OBJECT_CLASS (parent_class)->destroy (object);
}
static void
gimp_color_scale_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpColorScale *scale;
GtkRange *range;
gint focus = 0;
gint scale_width;
gint scale_height;
scale = GIMP_COLOR_SCALE (widget);
range = GTK_RANGE (widget);
if (GTK_WIDGET_CAN_FOCUS (widget))
{
gint focus_padding = 0;
gtk_widget_style_get (widget,
"focus-line-width", &focus,
"focus-padding", &focus_padding,
NULL);
focus += focus_padding;
}
range->min_slider_size = (MIN (widget->requisition.width,
widget->requisition.height) - 2 * focus) / 2;
if (GTK_WIDGET_CLASS (parent_class)->size_allocate)
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
scale_width = range->range_rect.width - 2 * (focus + SHADOW);
scale_height = range->range_rect.height - 2 * (focus + SHADOW);
switch (range->orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
scale_width -= range->min_slider_size - 1;
scale_height -= 2;
break;
case GTK_ORIENTATION_VERTICAL:
scale_width -= 2;
scale_height -= range->min_slider_size - 1;
break;
}
if (scale_width != scale->width || scale_height != scale->height)
{
scale->width = scale_width;
scale->height = scale_height;
scale->rowstride = (scale->width * 3 + 3) & ~0x3;
g_free (scale->buf);
scale->buf = g_new (guchar, scale->rowstride * scale->height);
scale->needs_render = TRUE;
}
}
static gboolean
gimp_color_scale_expose (GtkWidget *widget,
GdkEventExpose *event)
{
GimpColorScale *scale;
GtkRange *range;
GdkRectangle expose_area; /* Relative to widget->allocation */
GdkRectangle area;
gint focus = 0;
gint slider_size;
gint x, y;
gint w, h;
scale = GIMP_COLOR_SCALE (widget);
if (! scale->buf || ! GTK_WIDGET_DRAWABLE (widget))
return FALSE;
range = GTK_RANGE (scale);
/* This is ugly as it relies heavily on GTK+ internals, but I see no
* other way to force the range to recalculate its layout. Might
* break if GtkRange internals change.
*/
if (range->need_recalc)
{
GTK_WIDGET_UNSET_FLAGS (widget, GTK_REALIZED);
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget,
&widget->allocation);
GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
}
if (GTK_WIDGET_CAN_FOCUS (widget))
{
gint focus_padding = 0;
gtk_widget_style_get (widget,
"focus-line-width", &focus,
"focus-padding", &focus_padding,
NULL);
focus += focus_padding;
}
x = widget->allocation.x + range->range_rect.x + focus;
y = widget->allocation.y + range->range_rect.y + focus;
w = range->range_rect.width - 2 * focus;
h = range->range_rect.height - 2 * focus;
slider_size = range->min_slider_size / 2;
expose_area = event->area;
expose_area.x -= widget->allocation.x;
expose_area.y -= widget->allocation.y;
if (gdk_rectangle_intersect (&expose_area, &range->range_rect, &area))
{
gboolean sensitive;
if (scale->needs_render)
{
gimp_color_scale_render (scale);
scale->needs_render = FALSE;
}
area.x += widget->allocation.x;
area.y += widget->allocation.y;
sensitive = GTK_WIDGET_STATE (widget) != GTK_STATE_INSENSITIVE;
gtk_paint_box (widget->style, widget->window,
sensitive ? GTK_STATE_ACTIVE : GTK_STATE_INSENSITIVE,
GTK_SHADOW_IN,
&area, widget, "trough",
x, y, w, h);
gdk_gc_set_clip_rectangle (widget->style->black_gc, &area);
switch (range->orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
gdk_draw_rgb_image_dithalign (widget->window,
widget->style->black_gc,
x + SHADOW + slider_size,
y + SHADOW + 1,
scale->width,
scale->height,
GDK_RGB_DITHER_MAX,
scale->buf,
scale->rowstride,
0, 0);
break;
case GTK_ORIENTATION_VERTICAL:
gdk_draw_rgb_image_dithalign (widget->window,
widget->style->black_gc,
x + SHADOW + 1,
y + SHADOW + slider_size,
scale->width,
scale->height,
GDK_RGB_DITHER_MAX,
scale->buf,
scale->rowstride,
0, 0);
break;
}
gdk_gc_set_clip_rectangle (widget->style->black_gc, NULL);
}
if (GTK_WIDGET_IS_SENSITIVE (widget) && GTK_WIDGET_HAS_FOCUS (range))
gtk_paint_focus (widget->style, widget->window, GTK_WIDGET_STATE (widget),
&area, widget, "trough",
widget->allocation.x + range->range_rect.x,
widget->allocation.y + range->range_rect.y,
range->range_rect.width,
range->range_rect.height);
switch (range->orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
area.x = widget->allocation.x + range->slider_start;
area.y = y + SHADOW;
area.width = 2 * slider_size + 1;
area.height = h - 2 * SHADOW;
break;
case GTK_ORIENTATION_VERTICAL:
area.x = x + SHADOW;
area.y = widget->allocation.y + range->slider_start;
area.width = w - 2 * SHADOW;
area.height = 2 * slider_size + 1;
break;
}
if (gdk_rectangle_intersect (&event->area, &area, &expose_area))
{
gdk_gc_set_clip_rectangle (widget->style->black_gc, &expose_area);
switch (range->orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
for (w = area.width, x = area.x, y = area.y;
w > 0; w -= 2, x++, y++)
gdk_draw_line (widget->window, widget->style->black_gc,
x, y, x + w - 1, y);
break;
case GTK_ORIENTATION_VERTICAL:
for (h = area.height, x = area.x, y = area.y;
h > 0; h -= 2, x++, y++)
gdk_draw_line (widget->window, widget->style->black_gc,
x, y, x, y + h - 1);
break;
}
gdk_gc_set_clip_rectangle (widget->style->black_gc, NULL);
gdk_gc_set_clip_rectangle (widget->style->white_gc, &expose_area);
switch (range->orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
for (w = area.width, x = area.x, y = area.y + area.height - 1;
w > 0; w -= 2, x++, y--)
gdk_draw_line (widget->window, widget->style->white_gc,
x, y, x + w - 1, y);
break;
case GTK_ORIENTATION_VERTICAL:
for (h = area.height, x = area.x + area.width - 1, y = area.y;
h > 0; h -= 2, x--, y++)
gdk_draw_line (widget->window, widget->style->white_gc,
x, y, x, y + h - 1);
break;
}
gdk_gc_set_clip_rectangle (widget->style->white_gc, NULL);
}
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;
GtkRange *range;
scale = g_object_new (GIMP_TYPE_COLOR_SCALE, NULL);
scale->channel = channel;
range = GTK_RANGE (scale);
range->orientation = orientation;
range->flippable = (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)
{
if (range->orientation == GTK_ORIENTATION_HORIZONTAL)
return
(range->inverted && !range->flippable) ||
(range->inverted && range->flippable &&
gtk_widget_get_direction (GTK_WIDGET (range)) == GTK_TEXT_DIR_LTR) ||
(!range->inverted && range->flippable &&
gtk_widget_get_direction (GTK_WIDGET (range)) == GTK_TEXT_DIR_RTL);
else
return range->inverted;
}
static void
gimp_color_scale_render (GimpColorScale *scale)
{
GtkRange *range;
GimpRGB rgb;
GimpHSV hsv;
guint x, y;
gdouble *channel_value = NULL; /* shut up compiler */
gboolean to_rgb = FALSE;
gboolean invert;
guchar *buf;
guchar *d;
guchar r, g, b;
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;
}
range = GTK_RANGE (scale);
invert = should_invert (range);
switch (range->orientation)
{
case GTK_ORIENTATION_HORIZONTAL:
for (x = 0, d = buf; x < scale->width; x++, d += 3)
{
gdouble value = (gdouble) x / (gdouble) (scale->width - 1);
if (invert)
value = 1.0 - value;
*channel_value = value;
if (to_rgb)
gimp_hsv_to_rgb (&hsv, &rgb);
gimp_rgb_get_uchar (&rgb, d, d + 1, d + 2);
}
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);
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 += 3)
{
d[0] = r;
d[1] = g;
d[2] = b;
}
buf += scale->rowstride;
}
break;
}
}
static void
gimp_color_scale_render_alpha (GimpColorScale *scale)
{
GtkRange *range;
GimpRGB rgb;
gboolean invert;
gdouble a;
guint x, y;
guchar *buf;
guchar *d, *l;
range = GTK_RANGE (scale);
invert = should_invert (range);
buf = scale->buf;
rgb = scale->rgb;
switch (range->orientation)
{
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;
l[0] = (GIMP_CHECK_LIGHT +
(rgb.r - GIMP_CHECK_LIGHT) * a) * 255.999;
l[1] = (GIMP_CHECK_LIGHT +
(rgb.g - GIMP_CHECK_LIGHT) * a) * 255.999;
l[2] = (GIMP_CHECK_LIGHT +
(rgb.b - GIMP_CHECK_LIGHT) * a) * 255.999;
l += 3;
d[0] = (GIMP_CHECK_DARK +
(rgb.r - GIMP_CHECK_DARK) * a) * 255.999;
d[1] = (GIMP_CHECK_DARK +
(rgb.g - GIMP_CHECK_DARK) * a) * 255.999;
d[2] = (GIMP_CHECK_DARK +
(rgb.b - GIMP_CHECK_DARK) * a) * 255.999;
d += 3;
}
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[3];
guchar dark[3];
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;
light[0] = (GIMP_CHECK_LIGHT +
(rgb.r - GIMP_CHECK_LIGHT) * a) * 255.999;
light[1] = (GIMP_CHECK_LIGHT +
(rgb.g - GIMP_CHECK_LIGHT) * a) * 255.999;
light[2] = (GIMP_CHECK_LIGHT +
(rgb.b - GIMP_CHECK_LIGHT) * a) * 255.999;
dark[0] = (GIMP_CHECK_DARK +
(rgb.r - GIMP_CHECK_DARK) * a) * 255.999;
dark[1] = (GIMP_CHECK_DARK +
(rgb.g - GIMP_CHECK_DARK) * a) * 255.999;
dark[2] = (GIMP_CHECK_DARK +
(rgb.b - GIMP_CHECK_DARK) * a) * 255.999;
for (x = 0, l = d; x < scale->width; x++, l += 3)
{
if (((x / GIMP_CHECK_SIZE_SM) ^ (y / GIMP_CHECK_SIZE_SM)) & 1)
{
l[0] = light[0];
l[1] = light[1];
l[2] = light[2];
}
else
{
l[0] = dark[0];
l[1] = dark[1];
l[2] = dark[2];
}
}
}
}
break;
}
}
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