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50e6308388
gtk/gdk-pixbuf/gdk-pixbuf.c
Matthias Clasen 50e6308388 Merge 16- and 32-bit ico support from the stable branch. (#61179) 
* io-ico.c: Merge 16- and 32-bit ico support from the stable
        branch.  (#61179)

        * io-gif.c: Recomposite all images if the animation size changes
        while loading.  (#70055)

        * gdk-pixbuf.c (gdk-pixbuf-fill): Make it work for subpixbufs.
        (#70055)
2002-02-01 23:43:07 +00:00

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
/* GdkPixbuf library - Basic memory management
*
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Mark Crichton <crichton@gimp.org>
* Miguel de Icaza <miguel@gnu.org>
* Federico Mena-Quintero <federico@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 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
* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "gdk-pixbuf.h"
#include "gdk-pixbuf-private.h"
static void gdk_pixbuf_class_init (GdkPixbufClass *klass);
static void gdk_pixbuf_finalize (GObject *object);
static gpointer parent_class;
GType
gdk_pixbuf_get_type (void)
{
static GType object_type = 0;
if (!object_type) {
static const GTypeInfo object_info = {
sizeof (GdkPixbufClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gdk_pixbuf_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GdkPixbuf),
0, /* n_preallocs */
(GInstanceInitFunc) NULL,
};
object_type = g_type_register_static (G_TYPE_OBJECT,
"GdkPixbuf",
&object_info, 0);
}
return object_type;
}
static void
gdk_pixbuf_class_init (GdkPixbufClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
object_class->finalize = gdk_pixbuf_finalize;
}
static void
gdk_pixbuf_finalize (GObject *object)
{
GdkPixbuf *pixbuf = GDK_PIXBUF (object);
if (pixbuf->destroy_fn)
(* pixbuf->destroy_fn) (pixbuf->pixels, pixbuf->destroy_fn_data);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gdk_pixbuf_ref:
* @pixbuf: A pixbuf.
*
* Adds a reference to a pixbuf. Deprecated; use g_object_ref().
*
* Return value: The same as the @pixbuf argument.
**/
GdkPixbuf *
gdk_pixbuf_ref (GdkPixbuf *pixbuf)
{
return (GdkPixbuf *) g_object_ref (G_OBJECT(pixbuf));
}
/**
* gdk_pixbuf_unref:
* @pixbuf: A pixbuf.
*
* Removes a reference from a pixbuf. Deprecated; use
* g_object_unref().
*
**/
void
gdk_pixbuf_unref (GdkPixbuf *pixbuf)
{
g_object_unref (G_OBJECT (pixbuf));
}
/* Used as the destroy notification function for gdk_pixbuf_new() */
static void
free_buffer (guchar *pixels, gpointer data)
{
g_free (pixels);
}
/**
* gdk_pixbuf_new:
* @colorspace: Color space for image.
* @has_alpha: Whether the image should have transparency information.
* @bits_per_sample: Number of bits per color sample.
* @width: Width of image in pixels.
* @height: Height of image in pixels.
*
* Creates a new #GdkPixbuf structure and allocates a buffer for it. The buffer
* has an optimal rowstride. Note that the buffer is not cleared; you will have
* to fill it completely yourself.
*
* Return value: A newly-created #GdkPixbuf with a reference count of 1, or
* %NULL if not enough memory could be allocated for the image buffer.
**/
GdkPixbuf *
gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample,
int width, int height)
{
guchar *buf;
int channels;
int rowstride;
g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, NULL);
g_return_val_if_fail (bits_per_sample == 8, NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
/* Always align rows to 32-bit boundaries */
channels = has_alpha ? 4 : 3;
rowstride = 4 * ((channels * width + 3) / 4);
buf = g_try_malloc (height * rowstride);
if (!buf)
return NULL;
return gdk_pixbuf_new_from_data (buf, colorspace, has_alpha, bits_per_sample,
width, height, rowstride,
free_buffer, NULL);
}
/**
* gdk_pixbuf_copy:
* @pixbuf: A pixbuf.
*
* Creates a new #GdkPixbuf with a copy of the information in the specified
* @pixbuf.
*
* Return value: A newly-created pixbuf with a reference count of 1, or %NULL if
* not enough memory could be allocated.
**/
GdkPixbuf *
gdk_pixbuf_copy (const GdkPixbuf *pixbuf)
{
guchar *buf;
int size;
g_return_val_if_fail (pixbuf != NULL, NULL);
/* Calculate a semi-exact size. Here we copy with full rowstrides;
* maybe we should copy each row individually with the minimum
* rowstride?
*/
size = ((pixbuf->height - 1) * pixbuf->rowstride +
pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8));
buf = g_try_malloc (size * sizeof (guchar));
if (!buf)
return NULL;
memcpy (buf, pixbuf->pixels, size);
return gdk_pixbuf_new_from_data (buf,
pixbuf->colorspace, pixbuf->has_alpha,
pixbuf->bits_per_sample,
pixbuf->width, pixbuf->height,
pixbuf->rowstride,
free_buffer,
NULL);
}
/**
* gdk_pixbuf_new_subpixbuf:
* @src_pixbuf: a #GdkPixbuf
* @src_x: X coord in @src_pixbuf
* @src_y: Y coord in @src_pixbuf
* @width: width of region in @src_pixbuf
* @height: height of region in @src_pixbuf
*
* Creates a new pixbuf which represents a sub-region of
* @src_pixbuf. The new pixbuf shares its pixels with the
* original pixbuf, so writing to one affects both.
* The new pixbuf holds a reference to @src_pixbuf, so
* @src_pixbuf will not be finalized until the new pixbuf
* is finalized.
*
* Return value: a new pixbuf
**/
GdkPixbuf*
gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf,
int src_x,
int src_y,
int width,
int height)
{
guchar *pixels;
GdkPixbuf *sub;
g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), NULL);
g_return_val_if_fail (src_x >= 0 && src_x + width <= src_pixbuf->width, NULL);
g_return_val_if_fail (src_y >= 0 && src_y + height <= src_pixbuf->height, NULL);
pixels = (gdk_pixbuf_get_pixels (src_pixbuf)
+ src_y * src_pixbuf->rowstride
+ src_x * src_pixbuf->n_channels);
sub = gdk_pixbuf_new_from_data (pixels,
src_pixbuf->colorspace,
src_pixbuf->has_alpha,
src_pixbuf->bits_per_sample,
width, height,
src_pixbuf->rowstride,
NULL, NULL);
/* Keep a reference to src_pixbuf */
g_object_ref (src_pixbuf);
g_object_set_qdata_full (G_OBJECT (sub),
g_quark_from_static_string ("gdk-pixbuf-subpixbuf-src"),
src_pixbuf,
(GDestroyNotify) g_object_unref);
return sub;
}
/* Accessors */
/**
* gdk_pixbuf_get_colorspace:
* @pixbuf: A pixbuf.
*
* Queries the color space of a pixbuf.
*
* Return value: Color space.
**/
GdkColorspace
gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, GDK_COLORSPACE_RGB);
return pixbuf->colorspace;
}
/**
* gdk_pixbuf_get_n_channels:
* @pixbuf: A pixbuf.
*
* Queries the number of channels of a pixbuf.
*
* Return value: Number of channels.
**/
int
gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, -1);
return pixbuf->n_channels;
}
/**
* gdk_pixbuf_get_has_alpha:
* @pixbuf: A pixbuf.
*
* Queries whether a pixbuf has an alpha channel (opacity information).
*
* Return value: %TRUE if it has an alpha channel, %FALSE otherwise.
**/
gboolean
gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, -1);
return pixbuf->has_alpha ? TRUE : FALSE;
}
/**
* gdk_pixbuf_get_bits_per_sample:
* @pixbuf: A pixbuf.
*
* Queries the number of bits per color sample in a pixbuf.
*
* Return value: Number of bits per color sample.
**/
int
gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, -1);
return pixbuf->bits_per_sample;
}
/**
* gdk_pixbuf_get_pixels:
* @pixbuf: A pixbuf.
*
* Queries a pointer to the pixel data of a pixbuf.
*
* Return value: A pointer to the pixbuf's pixel data.
**/
guchar *
gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, NULL);
return pixbuf->pixels;
}
/**
* gdk_pixbuf_get_width:
* @pixbuf: A pixbuf.
*
* Queries the width of a pixbuf.
*
* Return value: Width in pixels.
**/
int
gdk_pixbuf_get_width (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, -1);
return pixbuf->width;
}
/**
* gdk_pixbuf_get_height:
* @pixbuf: A pixbuf.
*
* Queries the height of a pixbuf.
*
* Return value: Height in pixels.
**/
int
gdk_pixbuf_get_height (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, -1);
return pixbuf->height;
}
/**
* gdk_pixbuf_get_rowstride:
* @pixbuf: A pixbuf.
*
* Queries the rowstride of a pixbuf, which is the number of bytes between rows.
*
* Return value: Number of bytes between rows.
**/
int
gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf)
{
g_return_val_if_fail (pixbuf != NULL, -1);
return pixbuf->rowstride;
}
/* General initialization hooks */
const guint gdk_pixbuf_major_version = GDK_PIXBUF_MAJOR;
const guint gdk_pixbuf_minor_version = GDK_PIXBUF_MINOR;
const guint gdk_pixbuf_micro_version = GDK_PIXBUF_MICRO;
const char *gdk_pixbuf_version = GDK_PIXBUF_VERSION;
/* Error quark */
GQuark
gdk_pixbuf_error_quark (void)
{
static GQuark q = 0;
if (q == 0)
q = g_quark_from_static_string ("gdk-pixbuf-error-quark");
return q;
}
/**
* gdk_pixbuf_fill:
* @pixbuf: a #GdkPixbuf
* @pixel: RGBA pixel to clear to (0xffffffff is opaque white, 0x00000000 transparent black)
*
* Clears a pixbuf to the given RGBA value, converting the RGBA value into
* the pixbuf's pixel format. The alpha will be ignored if the pixbuf
* doesn't have an alpha channel.
*
**/
void
gdk_pixbuf_fill (GdkPixbuf *pixbuf,
guint32 pixel)
{
guchar *pixels;
gboolean all_the_same = FALSE;
guint r, g, b, a;
guchar *p;
gint n;
g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
if (pixbuf->width == 0 || pixbuf->height == 0)
return;
pixels = pixbuf->pixels;
r = (pixel & 0xff000000) >> 24;
g = (pixel & 0x00ff0000) >> 16;
b = (pixel & 0x0000ff00) >> 8;
a = (pixel & 0x000000ff);
if (r == g && g == b) {
if (!pixbuf->has_alpha)
all_the_same = TRUE;
else
all_the_same = (r == a);
}
if (all_the_same) {
if (pixbuf->has_alpha)
memset (pixels, r, pixbuf->width * 4);
else
memset (pixels, r, pixbuf->width * 3);
} else {
guchar c[4];
c[0] = r; c[1] = g; c[2] = b; c[3] = a;
p = pixels;
n = pixbuf->width;
if (pixbuf->has_alpha) {
do {
memcpy (p, c, 4);
p += 4;
} while (--n);
} else {
do {
memcpy (p, c, 3);
p += 3;
} while (--n);
}
}
p = pixels;
n = pixbuf->height - 1;
while (n--) {
p += pixbuf->rowstride;
memcpy (p, pixels, pixbuf->width * pixbuf->n_channels);
}
}
/**
* gdk_pixbuf_get_option:
* @pixbuf: a #GdkPixbuf
* @key: a nul-terminated string.
*
* Looks up @key in the list of options that may have been attached to the
* @pixbuf when it was loaded.
*
* Return value: the value associated with @key. This is a nul-terminated
* string that should not be freed or %NULL if @key was not found.
**/
G_CONST_RETURN gchar *
gdk_pixbuf_get_option (GdkPixbuf *pixbuf,
const gchar *key)
{
gchar **options;
gint i;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
g_return_val_if_fail (key != NULL, NULL);
options = g_object_get_qdata (G_OBJECT (pixbuf),
g_quark_from_static_string ("gdk_pixbuf_options"));
if (options) {
for (i = 0; options[2*i]; i++) {
if (strcmp (options[2*i], key) == 0)
return options[2*i+1];
}
}
return NULL;
}
/**
* gdk_pixbuf_set_option:
* @pixbuf: a #GdkPixbuf
* @key: a nul-terminated string.
* @value: a nul-terminated string.
*
* Attaches a key/value pair as an option to a #GdkPixbuf. If %key already
* exists in the list of options attached to @pixbuf, the new value is
* ignored and %FALSE is returned.
*
* Return value: %TRUE on success.
**/
gboolean
gdk_pixbuf_set_option (GdkPixbuf *pixbuf,
const gchar *key,
const gchar *value)
{
GQuark quark;
gchar **options;
gint n = 0;
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE);
g_return_val_if_fail (key != NULL, FALSE);
g_return_val_if_fail (value != NULL, FALSE);
quark = g_quark_from_static_string ("gdk_pixbuf_options");
options = g_object_get_qdata (G_OBJECT (pixbuf), quark);
if (options) {
for (n = 0; options[2*n]; n++) {
if (strcmp (options[2*n], key) == 0)
return FALSE;
}
g_object_steal_qdata (G_OBJECT (pixbuf), quark);
options = g_renew (gchar *, options, 2*(n+1) + 1);
} else {
options = g_new (gchar *, 3);
}
options[2*n] = g_strdup (key);
options[2*n+1] = g_strdup (value);
options[2*n+2] = NULL;
g_object_set_qdata_full (G_OBJECT (pixbuf), quark,
options, (GDestroyNotify) g_strfreev);
return TRUE;
}
/* Include the marshallers */
#include <glib-object.h>
#include "gdk-pixbuf-marshal.c"
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