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+/* LIBGIMP - The GIMP Library
+ * Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
+ *
+ * gimppixbuf.c
+ * Copyright (C) 2004 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 "gimp.h"
+
+#include "gimppixbuf.h"
+
+
+/**
+ * SECTION: gimppixbuf
+ * @title: gimppixbuf
+ * @short_description: Get a thumbnail pixbuf for a drawable or image.
+ *
+ * Get a thumbnail pixbuf for a drawable or image.
+ **/
+
+
+static GdkPixbuf * gimp_pixbuf_from_data (guchar *data,
+ gint width,
+ gint height,
+ gint bpp,
+ GimpPixbufTransparency alpha);
+
+
+/**
+ * gimp_image_get_thumbnail:
+ * @image_ID: the image ID
+ * @width: the requested thumbnail width (<= 1024 pixels)
+ * @height: the requested thumbnail height (<= 1024 pixels)
+ * @alpha: how to handle an alpha channel
+ *
+ * Retrieves a thumbnail pixbuf for the image identified by @image_ID.
+ * The thumbnail will be not larger than the requested size.
+ *
+ * Return value: a new #GdkPixbuf
+ *
+ * Since: 2.2
+ **/
+GdkPixbuf *
+gimp_image_get_thumbnail (gint32 image_ID,
+ gint width,
+ gint height,
+ GimpPixbufTransparency alpha)
+{
+ gint thumb_width = width;
+ gint thumb_height = height;
+ gint thumb_bpp;
+ guchar *data;
+
+ g_return_val_if_fail (width > 0 && width <= 1024, NULL);
+ g_return_val_if_fail (height > 0 && height <= 1024, NULL);
+
+ data = gimp_image_get_thumbnail_data (image_ID,
+ &thumb_width,
+ &thumb_height,
+ &thumb_bpp);
+ if (data)
+ return gimp_pixbuf_from_data (data,
+ thumb_width, thumb_height, thumb_bpp,
+ alpha);
+ else
+ return NULL;
+}
+
+/**
+ * gimp_drawable_get_thumbnail:
+ * @drawable_ID: the drawable ID
+ * @width: the requested thumbnail width (<= 1024 pixels)
+ * @height: the requested thumbnail height (<= 1024 pixels)
+ * @alpha: how to handle an alpha channel
+ *
+ * Retrieves a thumbnail pixbuf for the drawable identified by
+ * @drawable_ID. The thumbnail will be not larger than the requested
+ * size.
+ *
+ * Return value: a new #GdkPixbuf
+ *
+ * Since: 2.2
+ **/
+GdkPixbuf *
+gimp_drawable_get_thumbnail (gint32 drawable_ID,
+ gint width,
+ gint height,
+ GimpPixbufTransparency alpha)
+{
+ gint thumb_width = width;
+ gint thumb_height = height;
+ gint thumb_bpp;
+ guchar *data;
+
+ g_return_val_if_fail (width > 0 && width <= 1024, NULL);
+ g_return_val_if_fail (height > 0 && height <= 1024, NULL);
+
+ data = gimp_drawable_get_thumbnail_data (drawable_ID,
+ &thumb_width,
+ &thumb_height,
+ &thumb_bpp);
+
+ if (data)
+ return gimp_pixbuf_from_data (data,
+ thumb_width, thumb_height, thumb_bpp,
+ alpha);
+
+ return NULL;
+}
+
+/**
+ * gimp_drawable_get_sub_thumbnail:
+ * @drawable_ID: the drawable ID
+ * @src_x: the x coordinate of the area
+ * @src_y: the y coordinate of the area
+ * @src_width: the width of the area
+ * @src_height: the height of the area
+ * @dest_width: the requested thumbnail width (<= 1024 pixels)
+ * @dest_height: the requested thumbnail height (<= 1024 pixels)
+ * @alpha: how to handle an alpha channel
+ *
+ * Retrieves a thumbnail pixbuf for the drawable identified by
+ * @drawable_ID. The thumbnail will be not larger than the requested
+ * size.
+ *
+ * Return value: a new #GdkPixbuf
+ *
+ * Since: 2.2
+ **/
+GdkPixbuf *
+gimp_drawable_get_sub_thumbnail (gint32 drawable_ID,
+ gint src_x,
+ gint src_y,
+ gint src_width,
+ gint src_height,
+ gint dest_width,
+ gint dest_height,
+ GimpPixbufTransparency alpha)
+{
+ gint thumb_width = dest_width;
+ gint thumb_height = dest_height;
+ gint thumb_bpp;
+ guchar *data;
+
+ g_return_val_if_fail (src_x >= 0, NULL);
+ g_return_val_if_fail (src_y >= 0, NULL);
+ g_return_val_if_fail (src_width > 0, NULL);
+ g_return_val_if_fail (src_height > 0, NULL);
+ g_return_val_if_fail (dest_width > 0 && dest_width <= 1024, NULL);
+ g_return_val_if_fail (dest_height > 0 && dest_height <= 1024, NULL);
+
+ data = gimp_drawable_get_sub_thumbnail_data (drawable_ID,
+ src_x, src_y,
+ src_width, src_height,
+ &thumb_width,
+ &thumb_height,
+ &thumb_bpp);
+
+ if (data)
+ return gimp_pixbuf_from_data (data,
+ thumb_width, thumb_height, thumb_bpp,
+ alpha);
+
+ return NULL;
+}
+
+
+/*
+ * The data that is passed to this function is either freed here or
+ * owned by the returned pixbuf.
+ */
+static GdkPixbuf *
+gimp_pixbuf_from_data (guchar *data,
+ gint width,
+ gint height,
+ gint bpp,
+ GimpPixbufTransparency alpha)
+{
+ GdkPixbuf *pixbuf;
+
+ switch (bpp)
+ {
+ case 1:
+ pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
+ {
+ guchar *src = data;
+ guchar *pixels = gdk_pixbuf_get_pixels (pixbuf);
+ gint rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+ gint y;
+
+ for (y = 0; y < height; y++)
+ {
+ guchar *dest = pixels;
+ gint x;
+
+ for (x = 0; x < width; x++, src += 1, dest += 3)
+ {
+ dest[0] = dest[1] = dest[2] = src[0];
+ }
+
+ pixels += rowstride;
+ }
+
+ g_free (data);
+ }
+ bpp = 3;
+ break;
+
+ case 2:
+ pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8, width, height);
+ {
+ guchar *src = data;
+ guchar *pixels = gdk_pixbuf_get_pixels (pixbuf);
+ gint rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+ gint y;
+
+ for (y = 0; y < height; y++)
+ {
+ guchar *dest = pixels;
+ gint x;
+
+ for (x = 0; x < width; x++, src += 2, dest += 4)
+ {
+ dest[0] = dest[1] = dest[2] = src[0];
+ dest[3] = src[1];
+ }
+
+ pixels += rowstride;
+ }
+
+ g_free (data);
+ }
+ bpp = 4;
+ break;
+
+ case 3:
+ pixbuf = gdk_pixbuf_new_from_data (data,
+ GDK_COLORSPACE_RGB, FALSE, 8,
+ width, height, width * bpp,
+ (GdkPixbufDestroyNotify) g_free, NULL);
+ break;
+
+ case 4:
+ pixbuf = gdk_pixbuf_new_from_data (data,
+ GDK_COLORSPACE_RGB, TRUE, 8,
+ width, height, width * bpp,
+ (GdkPixbufDestroyNotify) g_free, NULL);
+ break;
+
+ default:
+ g_return_val_if_reached (NULL);
+ return NULL;
+ }
+
+ if (bpp == 4)
+ {
+ GdkPixbuf *tmp;
+ gint check_size = 0;
+
+ switch (alpha)
+ {
+ case GIMP_PIXBUF_KEEP_ALPHA:
+ return pixbuf;
+
+ case GIMP_PIXBUF_SMALL_CHECKS:
+ check_size = GIMP_CHECK_SIZE_SM;
+ break;
+
+ case GIMP_PIXBUF_LARGE_CHECKS:
+ check_size = GIMP_CHECK_SIZE;
+ break;
+ }
+
+ tmp = gdk_pixbuf_new (GDK_COLORSPACE_RGB, FALSE, 8, width, height);
+
+ gdk_pixbuf_composite_color (pixbuf, tmp,
+ 0, 0, width, height, 0, 0, 1.0, 1.0,
+ GDK_INTERP_NEAREST, 255,
+ 0, 0, check_size, 0x66666666, 0x99999999);
+
+ g_object_unref (pixbuf);
+ pixbuf = tmp;
+ }
+
+ return pixbuf;
+}
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