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| -rw-r--r-- | libgimpwidgets/gimpcairo-utils.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/libgimpwidgets/gimpcairo-utils.c b/libgimpwidgets/gimpcairo-utils.c new file mode 100644 index 0000000..a956f28 --- /dev/null +++ b/libgimpwidgets/gimpcairo-utils.c @@ -0,0 +1,202 @@ +/* LIBGIMP - The GIMP Library + * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball + * + * gimpcairo-utils.c + * Copyright (C) 2007 Sven Neumann <sven@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 3 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 + * Lesser 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, 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 "gimpcairo-utils.h" + + +/** + * SECTION: gimpcairo-utils + * @title: GimpCairo-utils + * @short_description: Utility functions for cairo + * + * Utility functions that make cairo easier to use with common + * GIMP data types. + **/ + + +/** + * gimp_cairo_set_focus_line_pattern: + * @cr: Cairo context + * @widget: widget to draw the focus indicator on + * + * Sets color and dash pattern for stroking a focus line on the given + * @cr. The line pattern is taken from @widget. + * + * Return value: %TRUE if the widget style has a focus line pattern, + * %FALSE otherwise + * + * Since: 2.6 + **/ +gboolean +gimp_cairo_set_focus_line_pattern (cairo_t *cr, + GtkWidget *widget) +{ + gint8 *dash_list; + gboolean retval = FALSE; + + g_return_val_if_fail (cr != NULL, FALSE); + g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE); + + gtk_widget_style_get (widget, + "focus-line-pattern", (gchar *) &dash_list, + NULL); + + if (dash_list[0]) + { + /* Taken straight from gtk_default_draw_focus() + */ + gint n_dashes = strlen ((const gchar *) dash_list); + gdouble *dashes = g_new (gdouble, n_dashes); + gdouble total_length = 0; + gint i; + + for (i = 0; i < n_dashes; i++) + { + dashes[i] = dash_list[i]; + total_length += dash_list[i]; + } + + cairo_set_dash (cr, dashes, n_dashes, 0.5); + + g_free (dashes); + + retval = TRUE; + } + + g_free (dash_list); + + return retval; +} + +/** + * gimp_cairo_surface_create_from_pixbuf: + * @pixbuf: a #GdkPixbuf + * + * Create a Cairo image surface from a GdkPixbuf. + * + * You should avoid calling this function as there are probably more + * efficient ways of achieving the result you are looking for. + * + * Returns: a #cairo_surface_t. + * + * Since: 2.6 + **/ +cairo_surface_t * +gimp_cairo_surface_create_from_pixbuf (GdkPixbuf *pixbuf) +{ + cairo_surface_t *surface; + cairo_format_t format; + guchar *dest; + const guchar *src; + gint width; + gint height; + gint src_stride; + gint dest_stride; + gint y; + + g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL); + + width = gdk_pixbuf_get_width (pixbuf); + height = gdk_pixbuf_get_height (pixbuf); + + switch (gdk_pixbuf_get_n_channels (pixbuf)) + { + case 3: + format = CAIRO_FORMAT_RGB24; + break; + case 4: + format = CAIRO_FORMAT_ARGB32; + break; + default: + g_assert_not_reached (); + break; + } + + surface = cairo_image_surface_create (format, width, height); + + cairo_surface_flush (surface); + + src = gdk_pixbuf_get_pixels (pixbuf); + src_stride = gdk_pixbuf_get_rowstride (pixbuf); + + dest = cairo_image_surface_get_data (surface); + dest_stride = cairo_image_surface_get_stride (surface); + + switch (format) + { + case CAIRO_FORMAT_RGB24: + for (y = 0; y < height; y++) + { + const guchar *s = src; + guchar *d = dest; + gint w = width; + + while (w--) + { + GIMP_CAIRO_RGB24_SET_PIXEL (d, s[0], s[1], s[2]); + + s += 3; + d += 4; + } + + src += src_stride; + dest += dest_stride; + } + break; + + case CAIRO_FORMAT_ARGB32: + for (y = 0; y < height; y++) + { + const guchar *s = src; + guchar *d = dest; + gint w = width; + + while (w--) + { + GIMP_CAIRO_ARGB32_SET_PIXEL (d, s[0], s[1], s[2], s[3]); + + s += 4; + d += 4; + } + + src += src_stride; + dest += dest_stride; + } + break; + + default: + break; + } + + cairo_surface_mark_dirty (surface); + + return surface; +} |