304 lines
8.8 KiB
C
304 lines
8.8 KiB
C
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/* LIBPIKA - The PIKA Library
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* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
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*
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* pikagradientchooser.c
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* Copyright (C) 1998 Andy Thomas
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*
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* This library is free software: you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikawidgets/pikawidgets.h"
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#include "pika.h"
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#include "pikauitypes.h"
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#include "pikagradientchooser.h"
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#include "pikauimarshal.h"
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#include "libpika-intl.h"
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/**
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* SECTION: pikagradientchooser
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* @title: PikaGradientChooser
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* @short_description: A button which pops up a gradient select dialog.
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*
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* A button which pops up a gradient select dialog.
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**/
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struct _PikaGradientChooser
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{
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PikaResourceChooser parent_instance;
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GtkWidget *preview;
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};
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/* local function prototypes */
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static void pika_gradient_chooser_draw_interior (PikaResourceChooser *self);
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static void pika_gradient_select_preview_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation,
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PikaGradientChooser *self);
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static gboolean pika_gradient_select_preview_draw_handler (GtkWidget *preview,
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cairo_t *cr,
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PikaGradientChooser *self);
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static const GtkTargetEntry drag_target = { "application/x-pika-gradient-name", 0 };
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G_DEFINE_FINAL_TYPE (PikaGradientChooser,
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pika_gradient_chooser,
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PIKA_TYPE_RESOURCE_CHOOSER)
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/* Initial dimensions of widget. */
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#define CELL_HEIGHT 18
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#define CELL_WIDTH 84
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static void
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pika_gradient_chooser_class_init (PikaGradientChooserClass *klass)
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{
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PikaResourceChooserClass *superclass = PIKA_RESOURCE_CHOOSER_CLASS (klass);
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superclass->draw_interior = pika_gradient_chooser_draw_interior;
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superclass->resource_type = PIKA_TYPE_GRADIENT;
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}
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static void
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pika_gradient_chooser_init (PikaGradientChooser *self)
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{
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GtkWidget *button;
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button = gtk_button_new ();
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gtk_container_add (GTK_CONTAINER (self), button);
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self->preview = gtk_drawing_area_new ();
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gtk_widget_set_size_request (self->preview, CELL_WIDTH, CELL_HEIGHT);
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gtk_container_add (GTK_CONTAINER (button), self->preview);
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g_signal_connect (self->preview, "size-allocate",
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G_CALLBACK (pika_gradient_select_preview_size_allocate),
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self);
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g_signal_connect (self->preview, "draw",
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G_CALLBACK (pika_gradient_select_preview_draw_handler),
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self);
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gtk_widget_show_all (GTK_WIDGET (self));
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pika_resource_chooser_set_drag_target (PIKA_RESOURCE_CHOOSER (self),
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self->preview, &drag_target);
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pika_resource_chooser_set_clickable (PIKA_RESOURCE_CHOOSER (self), button);
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}
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static void
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pika_gradient_chooser_draw_interior (PikaResourceChooser *self)
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{
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PikaGradientChooser *gradient_select = PIKA_GRADIENT_CHOOSER (self);
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gtk_widget_queue_draw (gradient_select->preview);
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}
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/**
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* pika_gradient_chooser_new:
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* @title: (nullable): Title of the dialog to use or %NULL to use the default title.
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* @label: (nullable): Button label or %NULL for no label.
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* @gradient: (nullable): Initial gradient.
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*
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* Creates a new #GtkWidget that lets a user choose a gradient.
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* You can use this widget in a table in a plug-in dialog.
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*
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* Returns: A #GtkWidget that you can use in your UI.
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*
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* Since: 2.4
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*/
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GtkWidget *
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pika_gradient_chooser_new (const gchar *title,
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const gchar *label,
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PikaResource *gradient)
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{
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GtkWidget *self;
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if (gradient == NULL)
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gradient = PIKA_RESOURCE (pika_context_get_gradient ());
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if (title)
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self = g_object_new (PIKA_TYPE_GRADIENT_CHOOSER,
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"title", title,
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"label", label,
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"resource", gradient,
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NULL);
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else
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self = g_object_new (PIKA_TYPE_GRADIENT_CHOOSER,
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"label", label,
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"resource", gradient,
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NULL);
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pika_gradient_chooser_draw_interior (PIKA_RESOURCE_CHOOSER (self));
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return self;
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}
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/* private functions */
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/* Get array of samples from self's gradient.
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* Return array and size at given handles.
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* Return success.
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*/
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static gboolean
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get_gradient_data (PikaGradientChooser *self,
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gint allocation_width,
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gint *sample_count,
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gdouble **sample_array)
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{
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PikaGradient *gradient;
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gboolean result;
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gdouble *samples;
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gint n_samples;
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g_object_get (self, "resource", &gradient, NULL);
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result = pika_gradient_get_uniform_samples (gradient,
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allocation_width,
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FALSE, /* not reversed. */
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&n_samples,
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&samples);
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if (result)
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{
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/* Return array of samples to dereferenced handles. */
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*sample_array = samples;
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*sample_count = n_samples;
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}
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g_object_unref (gradient);
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/* When result is true, caller must free the array. */
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return result;
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}
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/* Called on widget resized. */
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static void
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pika_gradient_select_preview_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation,
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PikaGradientChooser *self)
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{
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/* Do nothing.
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*
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* In former code, we cached the gradient data in self, on allocate event.
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* But allocate event always seems to be paired with a draw event,
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* so there is no point in caching the gradient data.
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* And caching gradient data is a premature optimization,
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* without deep knowledge of Gtk and actual performance testing,
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* you can't know caching helps performance.
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*/
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}
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/* Draw array of samples.
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* This understands mostly cairo, and little about gradient.
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*/
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static void
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pika_gradient_select_preview_draw (cairo_t *cr,
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gint src_width,
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gint dest_width,
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gdouble *src)
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{
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cairo_pattern_t *pattern;
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cairo_surface_t *surface;
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guchar *dest;
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gint x;
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pattern = pika_cairo_checkerboard_create (cr, PIKA_CHECK_SIZE_SM, NULL, NULL);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_paint (cr);
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surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, src_width, 1);
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for (x = 0, dest = cairo_image_surface_get_data (surface);
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x < src_width;
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x++, src += 4, dest += 4)
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{
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PikaRGB color;
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guchar r, g, b, a;
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pika_rgba_set (&color, src[0], src[1], src[2], src[3]);
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pika_rgba_get_uchar (&color, &r, &g, &b, &a);
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PIKA_CAIRO_ARGB32_SET_PIXEL (dest, r, g, b, a);
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}
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cairo_surface_mark_dirty (surface);
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pattern = cairo_pattern_create_for_surface (surface);
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cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
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cairo_surface_destroy (surface);
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cairo_scale (cr, (gdouble) dest_width / (gdouble) src_width, 1.0);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_paint (cr);
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}
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/* Handles a draw signal.
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* Draw self, i.e. interior of button.
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*
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* Always returns FALSE, but doesn't draw when fail to get gradient data.
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*
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* Is passed neither gradient nor attributes of gradient: get them now from self.
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*/
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static gboolean
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pika_gradient_select_preview_draw_handler (GtkWidget *widget,
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cairo_t *cr,
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PikaGradientChooser *self)
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{
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GtkAllocation allocation;
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/* Attributes of the source.*/
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gdouble *src;
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gint n_samples;
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gint src_width;
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gtk_widget_get_allocation (widget, &allocation);
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if (!get_gradient_data (self, allocation.width, &n_samples, &src))
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return FALSE;
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/* Width in pixels of src, since BPP is 4. */
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src_width = n_samples / 4;
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pika_gradient_select_preview_draw (cr, src_width, allocation.width, src);
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g_free (src);
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return FALSE;
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}
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