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-rw-r--r--eel/eel-graphic-effects.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/eel/eel-graphic-effects.c b/eel/eel-graphic-effects.c
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+/* Eel - pixbuf manipulation routines for graphical effects.
+ *
+ * Copyright (C) 2000 Eazel, Inc
+ *
+ * Author: Andy Hertzfeld <andy@eazel.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* This file contains pixbuf manipulation routines used for graphical effects like pre-lighting
+ * and selection hilighting */
+
+#include <config.h>
+
+#include "eel-graphic-effects.h"
+#include "eel-glib-extensions.h"
+
+#include <math.h>
+#include <string.h>
+
+/* shared utility to create a new pixbuf from the passed-in one */
+
+static GdkPixbuf *
+create_new_pixbuf (GdkPixbuf *src)
+{
+ g_assert (gdk_pixbuf_get_colorspace (src) == GDK_COLORSPACE_RGB);
+ g_assert ((!gdk_pixbuf_get_has_alpha (src)
+ && gdk_pixbuf_get_n_channels (src) == 3)
+ || (gdk_pixbuf_get_has_alpha (src)
+ && gdk_pixbuf_get_n_channels (src) == 4));
+
+ return gdk_pixbuf_new (gdk_pixbuf_get_colorspace (src),
+ gdk_pixbuf_get_has_alpha (src),
+ gdk_pixbuf_get_bits_per_sample (src),
+ gdk_pixbuf_get_width (src),
+ gdk_pixbuf_get_height (src));
+}
+
+/* utility routine to bump the level of a color component with pinning */
+
+const int HOVER_COMPONENT_ADDITION = 15;
+
+static guchar
+lighten_component (guchar cur_value)
+{
+ int new_value = cur_value;
+ new_value = cur_value + HOVER_COMPONENT_ADDITION;
+ if (new_value > 255)
+ {
+ new_value = 255;
+ }
+ return (guchar) new_value;
+}
+
+GdkPixbuf *
+eel_create_spotlight_pixbuf (GdkPixbuf *src)
+{
+ GdkPixbuf *dest;
+ int i, j;
+ int width, height, has_alpha, src_row_stride, dst_row_stride;
+ guchar *target_pixels, *original_pixels;
+ guchar *pixsrc, *pixdest;
+
+ g_return_val_if_fail (gdk_pixbuf_get_colorspace (src) == GDK_COLORSPACE_RGB, NULL);
+ g_return_val_if_fail ((!gdk_pixbuf_get_has_alpha (src)
+ && gdk_pixbuf_get_n_channels (src) == 3)
+ || (gdk_pixbuf_get_has_alpha (src)
+ && gdk_pixbuf_get_n_channels (src) == 4), NULL);
+ g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (src) == 8, NULL);
+
+ dest = create_new_pixbuf (src);
+
+ has_alpha = gdk_pixbuf_get_has_alpha (src);
+ width = gdk_pixbuf_get_width (src);
+ height = gdk_pixbuf_get_height (src);
+ dst_row_stride = gdk_pixbuf_get_rowstride (dest);
+ src_row_stride = gdk_pixbuf_get_rowstride (src);
+ target_pixels = gdk_pixbuf_get_pixels (dest);
+ original_pixels = gdk_pixbuf_get_pixels (src);
+
+ for (i = 0; i < height; i++)
+ {
+ pixdest = target_pixels + i * dst_row_stride;
+ pixsrc = original_pixels + i * src_row_stride;
+ for (j = 0; j < width; j++)
+ {
+ *pixdest++ = lighten_component (*pixsrc++);
+ *pixdest++ = lighten_component (*pixsrc++);
+ *pixdest++ = lighten_component (*pixsrc++);
+ if (has_alpha)
+ {
+ *pixdest++ = *pixsrc++;
+ }
+ }
+ }
+ return dest;
+}
+
+/* This routine colorizes %src by multiplying each pixel with colors in %dest. */
+
+GdkPixbuf *
+eel_create_colorized_pixbuf (GdkPixbuf *src,
+ GdkPixbuf *dest)
+{
+ int i, j;
+ int width, height, has_alpha, src_row_stride, dst_row_stride;
+ guchar *target_pixels;
+ guchar *original_pixels;
+ guchar *pixsrc;
+ guchar *pixdest;
+
+ g_return_val_if_fail (gdk_pixbuf_get_colorspace (src) == GDK_COLORSPACE_RGB, NULL);
+ g_return_val_if_fail (gdk_pixbuf_get_colorspace (dest) == GDK_COLORSPACE_RGB, NULL);
+
+ g_return_val_if_fail ((!gdk_pixbuf_get_has_alpha (src)
+ && gdk_pixbuf_get_n_channels (src) == 3)
+ || (gdk_pixbuf_get_has_alpha (src)
+ && gdk_pixbuf_get_n_channels (src) == 4), NULL);
+ g_return_val_if_fail ((!gdk_pixbuf_get_has_alpha (dest)
+ && gdk_pixbuf_get_n_channels (dest) == 3)
+ || (gdk_pixbuf_get_has_alpha (dest)
+ && gdk_pixbuf_get_n_channels (dest) == 4), NULL);
+
+ g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (src) == 8, NULL);
+ g_return_val_if_fail (gdk_pixbuf_get_bits_per_sample (dest) == 8, NULL);
+
+ has_alpha = gdk_pixbuf_get_has_alpha (src);
+ width = gdk_pixbuf_get_width (src);
+ height = gdk_pixbuf_get_height (src);
+ src_row_stride = gdk_pixbuf_get_rowstride (src);
+ dst_row_stride = gdk_pixbuf_get_rowstride (dest);
+ target_pixels = gdk_pixbuf_get_pixels (dest);
+ original_pixels = gdk_pixbuf_get_pixels (src);
+
+ for (i = 0; i < height; i++)
+ {
+ pixdest = target_pixels + i * dst_row_stride;
+ pixsrc = original_pixels + i * src_row_stride;
+ for (j = 0; j < width; j++)
+ {
+ *pixdest = ((*pixsrc++) * (*pixdest)) >> 8;
+ pixdest++;
+ *pixdest = ((*pixsrc++) * (*pixdest)) >> 8;
+ pixdest++;
+ *pixdest = ((*pixsrc++) * (*pixdest)) >> 8;
+ pixdest++;
+ if (has_alpha)
+ {
+ *pixdest++ = *pixsrc++;
+ }
+ }
+ }
+ return dest;
+}