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gimp/libgimp/gimppixbuf.c

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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
* <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf.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: GIMP 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: GIMP 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: GIMP 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;
}
/**
* gimp_layer_new_from_pixbuf:
* @image_ID: The RGB image to which to add the layer.
* @name: The layer name.
* @pixbuf: A GdkPixbuf.
* @opacity: The layer opacity.
* @mode: The layer combination mode.
* @progress_start: start of progress
* @progress_end: end of progress
*
* Create a new layer from a %GdkPixbuf.
*
* This procedure creates a new layer from the given %GdkPixbuf. The
* image has to be an RGB image and just like with gimp_layer_new()
* you will still need to add the layer to it.
*
* If you pass @progress_end > @progress_start to this function,
* gimp_progress_update() will be called for. You have to call
* gimp_progress_init() beforehand then.
*
* Returns: The newly created layer.
*
* Since: GIMP 2.4
*/
gint32
gimp_layer_new_from_pixbuf (gint32 image_ID,
const gchar *name,
GdkPixbuf *pixbuf,
gdouble opacity,
GimpLayerModeEffects mode,
gdouble progress_start,
gdouble progress_end)
{
GimpDrawable *drawable;
GimpPixelRgn rgn;
const guchar *pixels;
gpointer pr;
gint32 layer;
gint width;
gint height;
gint rowstride;
gint bpp;
gdouble range = progress_end - progress_start;
guint count = 0;
guint done = 0;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1);
if (gimp_image_base_type (image_ID) != GIMP_RGB)
{
g_warning ("gimp_layer_new_from_pixbuf() needs an RGB image");
return -1;
}
if (gdk_pixbuf_get_colorspace (pixbuf) != GDK_COLORSPACE_RGB)
{
g_warning ("gimp_layer_new_from_pixbuf() assumes that GdkPixbuf is RGB");
return -1;
}
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
bpp = gdk_pixbuf_get_n_channels (pixbuf);
layer = gimp_layer_new (image_ID, name, width, height,
bpp == 3 ? GIMP_RGB_IMAGE : GIMP_RGBA_IMAGE,
opacity, mode);
if (layer == -1)
return -1;
drawable = gimp_drawable_get (layer);
gimp_pixel_rgn_init (&rgn, drawable, 0, 0, width, height, TRUE, FALSE);
g_assert (bpp == rgn.bpp);
rowstride = gdk_pixbuf_get_rowstride (pixbuf);
pixels = gdk_pixbuf_get_pixels (pixbuf);
for (pr = gimp_pixel_rgns_register (1, &rgn);
pr != NULL;
pr = gimp_pixel_rgns_process (pr))
{
const guchar *src = pixels + rgn.y * rowstride + rgn.x * bpp;
guchar *dest = rgn.data;
gint y;
for (y = 0; y < rgn.h; y++)
{
memcpy (dest, src, rgn.w * rgn.bpp);
src += rowstride;
dest += rgn.rowstride;
}
if (range > 0.0)
{
done += rgn.h * rgn.w;
if (count++ % 32 == 0)
gimp_progress_update (progress_start +
(gdouble) done / (width * height) * range);
}
}
if (range > 0.0)
gimp_progress_update (progress_end);
gimp_drawable_detach (drawable);
return layer;
}
/*
* 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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