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-rw-r--r--app/widgets/gimpviewrenderergradient.c265
1 files changed, 265 insertions, 0 deletions
diff --git a/app/widgets/gimpviewrenderergradient.c b/app/widgets/gimpviewrenderergradient.c
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+++ b/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 3 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, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.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;
+}
+
+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 (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;
+ GimpColorTransform *transform;
+ 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,
+ rendergrad->blend_color_space,
+ &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);
+
+ cairo_surface_flush (renderer->surface);
+
+ dest = cairo_image_surface_get_data (renderer->surface);
+ dest_stride = cairo_image_surface_get_stride (renderer->surface);
+
+ transform = gimp_view_renderer_get_color_transform (renderer, widget,
+ babl_format ("cairo-ARGB32"),
+ babl_format ("cairo-ARGB32"));
+
+ if (transform)
+ gimp_color_transform_process_pixels (transform,
+ babl_format ("cairo-ARGB32"), buf,
+ babl_format ("cairo-ARGB32"), buf,
+ renderer->width);
+
+ for (y = 0; y < renderer->height; y++, dest += dest_stride)
+ {
+ memcpy (dest, buf, renderer->width * 4);
+ }
+
+ cairo_surface_mark_dirty (renderer->surface);
+}
+
+void
+gimp_view_renderer_gradient_set_offsets (GimpViewRendererGradient *renderer,
+ gdouble left,
+ gdouble right)
+{
+ 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));
+ }
+}
+
+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));
+ }
+}
+
+void
+gimp_view_renderer_gradient_set_blend_color_space (GimpViewRendererGradient *renderer,
+ GimpGradientBlendColorSpace blend_color_space)
+{
+ g_return_if_fail (GIMP_IS_VIEW_RENDERER_GRADIENT (renderer));
+
+ if (blend_color_space != renderer->blend_color_space)
+ {
+ renderer->blend_color_space = blend_color_space;
+
+ gimp_view_renderer_invalidate (GIMP_VIEW_RENDERER (renderer));
+ gimp_view_renderer_update (GIMP_VIEW_RENDERER (renderer));
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-08 15:40:27 +0000