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gimp/app/widgets/gimpviewrenderergradient.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpviewrenderergradient.c
* Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; 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 "libgimpbase/gimpbase.h"
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "widgets-types.h"
#include "core/gimpgradient.h"
#include "gimpviewrenderergradient.h"
static void gimp_view_renderer_gradient_set_context (GimpViewRenderer *renderer,
GimpContext *context);
static void gimp_view_renderer_gradient_invalidate (GimpViewRenderer *renderer);
static void gimp_view_renderer_gradient_render (GimpViewRenderer *renderer,
GtkWidget *widget);
G_DEFINE_TYPE (GimpViewRendererGradient, gimp_view_renderer_gradient,
GIMP_TYPE_VIEW_RENDERER);
#define parent_class gimp_view_renderer_gradient_parent_class
static void
gimp_view_renderer_gradient_class_init (GimpViewRendererGradientClass *klass)
{
GimpViewRendererClass *renderer_class = GIMP_VIEW_RENDERER_CLASS (klass);
renderer_class->set_context = gimp_view_renderer_gradient_set_context;
renderer_class->invalidate = gimp_view_renderer_gradient_invalidate;
renderer_class->render = gimp_view_renderer_gradient_render;
}
static void
gimp_view_renderer_gradient_init (GimpViewRendererGradient *renderer)
{
renderer->left = 0.0;
renderer->right = 1.0;
renderer->reverse = FALSE;
}
static void
gimp_view_renderer_gradient_fg_bg_changed (GimpContext *context,
const GimpRGB *color,
GimpViewRenderer *renderer)
{
#if 0
g_printerr ("%s: invalidating %s\n", G_STRFUNC,
gimp_object_get_name (GIMP_OBJECT (renderer->viewable)));
#endif
gimp_view_renderer_invalidate (renderer);
}
static void
gimp_view_renderer_gradient_set_context (GimpViewRenderer *renderer,
GimpContext *context)
{
GimpViewRendererGradient *rendergrad;
rendergrad = GIMP_VIEW_RENDERER_GRADIENT (renderer);
if (renderer->context && rendergrad->has_fg_bg_segments)
{
g_signal_handlers_disconnect_by_func (renderer->context,
gimp_view_renderer_gradient_fg_bg_changed,
renderer);
}
GIMP_VIEW_RENDERER_CLASS (parent_class)->set_context (renderer, context);
if (renderer->context && rendergrad->has_fg_bg_segments)
{
g_signal_connect (renderer->context, "foreground-changed",
G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
renderer);
g_signal_connect (renderer->context, "background-changed",
G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
renderer);
gimp_view_renderer_gradient_fg_bg_changed (renderer->context,
NULL,
renderer);
}
}
static void
gimp_view_renderer_gradient_invalidate (GimpViewRenderer *renderer)
{
GimpViewRendererGradient *rendergrad;
gboolean has_fg_bg_segments = FALSE;
rendergrad = GIMP_VIEW_RENDERER_GRADIENT (renderer);
if (renderer->viewable)
has_fg_bg_segments =
gimp_gradient_has_fg_bg_segments (GIMP_GRADIENT (renderer->viewable));
if (rendergrad->has_fg_bg_segments != has_fg_bg_segments)
{
if (renderer->context)
{
if (rendergrad->has_fg_bg_segments)
{
g_signal_handlers_disconnect_by_func (renderer->context,
gimp_view_renderer_gradient_fg_bg_changed,
renderer);
}
else
{
g_signal_connect (renderer->context, "foreground-changed",
G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
renderer);
g_signal_connect (renderer->context, "background-changed",
G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
renderer);
}
}
rendergrad->has_fg_bg_segments = has_fg_bg_segments;
}
GIMP_VIEW_RENDERER_CLASS (parent_class)->invalidate (renderer);
}
static void
gimp_view_renderer_gradient_render (GimpViewRenderer *renderer,
GtkWidget *widget)
{
GimpViewRendererGradient *rendergrad = GIMP_VIEW_RENDERER_GRADIENT (renderer);
GimpGradient *gradient = GIMP_GRADIENT (renderer->viewable);
GimpGradientSegment *seg = NULL;
guchar *buf;
guchar *dest;
gint dest_stride;
gint x;
gint y;
gdouble dx, cur_x;
GimpRGB color;
buf = g_alloca (4 * renderer->width);
dx = (rendergrad->right - rendergrad->left) / (renderer->width - 1);
cur_x = rendergrad->left;
for (x = 0, dest = buf; x < renderer->width; x++, dest += 4)
{
guchar r, g, b, a;
seg = gimp_gradient_get_color_at (gradient, renderer->context, seg,
cur_x, rendergrad->reverse, &color);
cur_x += dx;
gimp_rgba_get_uchar (&color, &r, &g, &b, &a);
GIMP_CAIRO_ARGB32_SET_PIXEL (dest, r, g, b, a);
}
if (! renderer->surface)
renderer->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
renderer->width,
renderer->height);
dest = cairo_image_surface_get_data (renderer->surface);
dest_stride = cairo_image_surface_get_stride (renderer->surface);
for (y = 0; y < renderer->height; y++, dest += dest_stride)
{
memcpy (dest, buf, renderer->width * 4);
}
renderer->needs_render = FALSE;
}
void
gimp_view_renderer_gradient_set_offsets (GimpViewRendererGradient *renderer,
gdouble left,
gdouble right,
gboolean instant_update)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER_GRADIENT (renderer));
left = CLAMP (left, 0.0, 1.0);
right = CLAMP (right, left, 1.0);
if (left != renderer->left || right != renderer->right)
{
renderer->left = left;
renderer->right = right;
gimp_view_renderer_invalidate (GIMP_VIEW_RENDERER (renderer));
if (instant_update)
gimp_view_renderer_update (GIMP_VIEW_RENDERER (renderer));
}
}
void
gimp_view_renderer_gradient_set_reverse (GimpViewRendererGradient *renderer,
gboolean reverse)
{
g_return_if_fail (GIMP_IS_VIEW_RENDERER_GRADIENT (renderer));
if (reverse != renderer->reverse)
{
renderer->reverse = reverse ? TRUE : FALSE;
gimp_view_renderer_invalidate (GIMP_VIEW_RENDERER (renderer));
gimp_view_renderer_update (GIMP_VIEW_RENDERER (renderer));
}
}
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