diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:30:19 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:30:19 +0000 |
commit | 5c1676dfe6d2f3c837a5e074117b45613fd29a72 (patch) | |
tree | cbffb45144febf451e54061db2b21395faf94bfe /libgimp/gimppixbuf.c | |
parent | Initial commit. (diff) | |
download | gimp-5c1676dfe6d2f3c837a5e074117b45613fd29a72.tar.xz gimp-5c1676dfe6d2f3c837a5e074117b45613fd29a72.zip |
Adding upstream version 2.10.34.upstream/2.10.34upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | libgimp/gimppixbuf.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/libgimp/gimppixbuf.c b/libgimp/gimppixbuf.c new file mode 100644 index 0000000..bd3cb46 --- /dev/null +++ b/libgimp/gimppixbuf.c @@ -0,0 +1,302 @@ +/* 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; +} |