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b6856af9d8
I still see some limitations in GimpGradient, and in particular, they are still always stored as RGB in GGR files. It would be nice if we could store the actual color format. This way, if someone chooses a gradient stop as Lab or CMYK color, that's what the gradient file would keep track of. But also even storing the space of a color (instead of storing/loading always in sRGB, even though this may still work fine as we store unbounded double values). This might warrant for a v2 of GGR file format. This commit also fixes loading of SVG gradient which was apparently broken regarding hexadecimal color parsing. Finally I improve gegl_color_set_alpha() by adding an alpha channel when the initial format had none.
263 lines
8.9 KiB
C
263 lines
8.9 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpviewrenderergradient.c
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* Copyright (C) 2003 Michael Natterer <mitch@gimp.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libgimpbase/gimpbase.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpwidgets/gimpwidgets.h"
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#include "widgets-types.h"
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#include "core/gimpgradient.h"
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#include "gimpviewrenderergradient.h"
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static void gimp_view_renderer_gradient_set_context (GimpViewRenderer *renderer,
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GimpContext *context);
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static void gimp_view_renderer_gradient_invalidate (GimpViewRenderer *renderer);
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static void gimp_view_renderer_gradient_render (GimpViewRenderer *renderer,
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GtkWidget *widget);
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G_DEFINE_TYPE (GimpViewRendererGradient, gimp_view_renderer_gradient,
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GIMP_TYPE_VIEW_RENDERER);
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#define parent_class gimp_view_renderer_gradient_parent_class
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static void
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gimp_view_renderer_gradient_class_init (GimpViewRendererGradientClass *klass)
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{
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GimpViewRendererClass *renderer_class = GIMP_VIEW_RENDERER_CLASS (klass);
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renderer_class->set_context = gimp_view_renderer_gradient_set_context;
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renderer_class->invalidate = gimp_view_renderer_gradient_invalidate;
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renderer_class->render = gimp_view_renderer_gradient_render;
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}
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static void
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gimp_view_renderer_gradient_init (GimpViewRendererGradient *renderer)
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{
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renderer->left = 0.0;
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renderer->right = 1.0;
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}
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static void
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gimp_view_renderer_gradient_fg_bg_changed (GimpContext *context,
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GeglColor *color,
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GimpViewRenderer *renderer)
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{
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#if 0
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g_printerr ("%s: invalidating %s\n", G_STRFUNC,
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gimp_object_get_name (renderer->viewable));
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#endif
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gimp_view_renderer_invalidate (renderer);
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}
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static void
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gimp_view_renderer_gradient_set_context (GimpViewRenderer *renderer,
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GimpContext *context)
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{
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GimpViewRendererGradient *rendergrad;
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rendergrad = GIMP_VIEW_RENDERER_GRADIENT (renderer);
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if (renderer->context && rendergrad->has_fg_bg_segments)
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{
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g_signal_handlers_disconnect_by_func (renderer->context,
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gimp_view_renderer_gradient_fg_bg_changed,
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renderer);
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}
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GIMP_VIEW_RENDERER_CLASS (parent_class)->set_context (renderer, context);
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if (renderer->context && rendergrad->has_fg_bg_segments)
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{
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g_signal_connect (renderer->context, "foreground-changed",
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G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
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renderer);
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g_signal_connect (renderer->context, "background-changed",
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G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
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renderer);
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gimp_view_renderer_gradient_fg_bg_changed (renderer->context,
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NULL,
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renderer);
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}
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}
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static void
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gimp_view_renderer_gradient_invalidate (GimpViewRenderer *renderer)
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{
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GimpViewRendererGradient *rendergrad;
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gboolean has_fg_bg_segments = FALSE;
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rendergrad = GIMP_VIEW_RENDERER_GRADIENT (renderer);
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if (renderer->viewable)
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has_fg_bg_segments =
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gimp_gradient_has_fg_bg_segments (GIMP_GRADIENT (renderer->viewable));
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if (rendergrad->has_fg_bg_segments != has_fg_bg_segments)
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{
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if (renderer->context)
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{
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if (rendergrad->has_fg_bg_segments)
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{
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g_signal_handlers_disconnect_by_func (renderer->context,
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gimp_view_renderer_gradient_fg_bg_changed,
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renderer);
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}
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else
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{
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g_signal_connect (renderer->context, "foreground-changed",
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G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
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renderer);
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g_signal_connect (renderer->context, "background-changed",
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G_CALLBACK (gimp_view_renderer_gradient_fg_bg_changed),
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renderer);
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}
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}
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rendergrad->has_fg_bg_segments = has_fg_bg_segments;
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}
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GIMP_VIEW_RENDERER_CLASS (parent_class)->invalidate (renderer);
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}
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static void
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gimp_view_renderer_gradient_render (GimpViewRenderer *renderer,
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GtkWidget *widget)
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{
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GimpViewRendererGradient *rendergrad = GIMP_VIEW_RENDERER_GRADIENT (renderer);
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GimpGradient *gradient = GIMP_GRADIENT (renderer->viewable);
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GimpGradientSegment *seg = NULL;
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GimpColorConfig *color_config;
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const Babl *dest_space;
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guchar *buf;
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guchar *dest;
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gint dest_stride;
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gint x;
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gint y;
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gdouble dx, cur_x;
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buf = g_alloca (4 * renderer->width);
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dx = (rendergrad->right - rendergrad->left) / (renderer->width - 1);
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cur_x = rendergrad->left;
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color_config = gimp_view_renderer_get_color_config (renderer);
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g_return_if_fail (color_config != NULL);
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dest_space = gimp_widget_get_render_space (widget, color_config);
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for (x = 0, dest = buf; x < renderer->width; x++, dest += 4)
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{
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GeglColor *color = NULL;
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seg = gimp_gradient_get_color_at (gradient, renderer->context, seg,
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cur_x,
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rendergrad->reverse,
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rendergrad->blend_color_space,
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&color);
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cur_x += dx;
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/* This is only for rendering the gradient on thumbnails or small
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* previews, so cairo-ARGB32 is probably enough.
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*/
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gegl_color_get_pixel (color,
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babl_format_with_space ("cairo-ARGB32", dest_space),
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dest);
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g_object_unref (color);
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}
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if (! renderer->surface)
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renderer->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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renderer->width,
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renderer->height);
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cairo_surface_flush (renderer->surface);
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dest = cairo_image_surface_get_data (renderer->surface);
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dest_stride = cairo_image_surface_get_stride (renderer->surface);
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for (y = 0; y < renderer->height; y++, dest += dest_stride)
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memcpy (dest, buf, renderer->width * 4);
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cairo_surface_mark_dirty (renderer->surface);
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}
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void
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gimp_view_renderer_gradient_set_offsets (GimpViewRendererGradient *renderer,
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gdouble left,
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gdouble right)
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{
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g_return_if_fail (GIMP_IS_VIEW_RENDERER_GRADIENT (renderer));
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left = CLAMP (left, 0.0, 1.0);
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right = CLAMP (right, left, 1.0);
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if (left != renderer->left || right != renderer->right)
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{
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renderer->left = left;
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renderer->right = right;
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gimp_view_renderer_invalidate (GIMP_VIEW_RENDERER (renderer));
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}
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}
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void
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gimp_view_renderer_gradient_set_reverse (GimpViewRendererGradient *renderer,
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gboolean reverse)
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{
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g_return_if_fail (GIMP_IS_VIEW_RENDERER_GRADIENT (renderer));
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if (reverse != renderer->reverse)
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{
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renderer->reverse = reverse ? TRUE : FALSE;
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gimp_view_renderer_invalidate (GIMP_VIEW_RENDERER (renderer));
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gimp_view_renderer_update (GIMP_VIEW_RENDERER (renderer));
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}
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}
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void
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gimp_view_renderer_gradient_set_blend_color_space (GimpViewRendererGradient *renderer,
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GimpGradientBlendColorSpace blend_color_space)
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{
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g_return_if_fail (GIMP_IS_VIEW_RENDERER_GRADIENT (renderer));
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if (blend_color_space != renderer->blend_color_space)
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{
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renderer->blend_color_space = blend_color_space;
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gimp_view_renderer_invalidate (GIMP_VIEW_RENDERER (renderer));
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gimp_view_renderer_update (GIMP_VIEW_RENDERER (renderer));
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}
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}
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