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