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livetrax/libs/tk/ydk-pixbuf/gdk-pixbuf-animation.c
Robin Gareus ad51c7c2ba
Localize stripped down gtk2 
This is intended mainly for GNU/Linux distros who will remove
GTK2 support in the near future.
2024-01-06 21:52:48 +01:00

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34 KiB
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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */
/* GdkPixbuf library - Simple animation support
*
* Copyright (C) 1999 The Free Software Foundation
*
* Authors: Jonathan Blandford <jrb@redhat.com>
* Havoc Pennington <hp@redhat.com>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-animation.h"
#include "gdk-pixbuf-loader.h"
#include <glib/gstdio.h>
/**
* SECTION:animation
* @Short_description: Animated images.
* @Title: Animations
* @See_also: #GdkPixbufLoader.
*
* The GdkPixBuf library provides a simple mechanism to load and
* represent animations. An animation is conceptually a series of
* frames to be displayed over time. The animation may not be
* represented as a series of frames internally; for example, it may
* be stored as a sprite and instructions for moving the sprite around
* a background. To display an animation you don't need to understand
* its representation, however; you just ask GdkPixBuf what should
* be displayed at a given point in time.
*
*/
typedef struct _GdkPixbufNonAnim GdkPixbufNonAnim;
typedef struct _GdkPixbufNonAnimClass GdkPixbufNonAnimClass;
#define GDK_TYPE_PIXBUF_NON_ANIM (gdk_pixbuf_non_anim_get_type ())
#define GDK_PIXBUF_NON_ANIM(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_PIXBUF_NON_ANIM, GdkPixbufNonAnim))
#define GDK_IS_PIXBUF_NON_ANIM(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF_NON_ANIM))
#define GDK_PIXBUF_NON_ANIM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_PIXBUF_NON_ANIM, GdkPixbufNonAnimClass))
#define GDK_IS_PIXBUF_NON_ANIM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_PIXBUF_NON_ANIM))
#define GDK_PIXBUF_NON_ANIM_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_PIXBUF_NON_ANIM, GdkPixbufNonAnimClass))
/* Private part of the GdkPixbufNonAnim structure */
struct _GdkPixbufNonAnim {
GdkPixbufAnimation parent_instance;
GdkPixbuf *pixbuf;
};
struct _GdkPixbufNonAnimClass {
GdkPixbufAnimationClass parent_class;
};
typedef struct _GdkPixbufNonAnimIter GdkPixbufNonAnimIter;
typedef struct _GdkPixbufNonAnimIterClass GdkPixbufNonAnimIterClass;
#define GDK_TYPE_PIXBUF_NON_ANIM_ITER (gdk_pixbuf_non_anim_iter_get_type ())
#define GDK_PIXBUF_NON_ANIM_ITER(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_PIXBUF_NON_ANIM_ITER, GdkPixbufNonAnimIter))
#define GDK_IS_PIXBUF_NON_ANIM_ITER(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF_NON_ANIM_ITER))
#define GDK_PIXBUF_NON_ANIM_ITER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_PIXBUF_NON_ANIM_ITER, GdkPixbufNonAnimIterClass))
#define GDK_IS_PIXBUF_NON_ANIM_ITER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_PIXBUF_NON_ANIM_ITER))
#define GDK_PIXBUF_NON_ANIM_ITER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_PIXBUF_NON_ANIM_ITER, GdkPixbufNonAnimIterClass))
struct _GdkPixbufNonAnimIter {
GdkPixbufAnimationIter parent_instance;
GdkPixbufNonAnim *non_anim;
};
struct _GdkPixbufNonAnimIterClass {
GdkPixbufAnimationIterClass parent_class;
};
static GType gdk_pixbuf_non_anim_iter_get_type (void) G_GNUC_CONST;
G_DEFINE_TYPE (GdkPixbufAnimation, gdk_pixbuf_animation, G_TYPE_OBJECT);
static void
gdk_pixbuf_animation_class_init (GdkPixbufAnimationClass *klass)
{
}
static void
gdk_pixbuf_animation_init (GdkPixbufAnimation *animation)
{
}
static void
prepared_notify (GdkPixbuf *pixbuf,
GdkPixbufAnimation *anim,
gpointer user_data)
{
if (anim != NULL)
g_object_ref (anim);
else
anim = gdk_pixbuf_non_anim_new (pixbuf);
*((GdkPixbufAnimation **)user_data) = anim;
}
/**
* gdk_pixbuf_animation_new_from_file:
* @filename: Name of file to load, in the GLib file name encoding
* @error: return location for error
*
* Creates a new animation by loading it from a file. The file format is
* detected automatically. If the file's format does not support multi-frame
* images, then an animation with a single frame will be created. Possible errors
* are in the #GDK_PIXBUF_ERROR and #G_FILE_ERROR domains.
*
* Return value: A newly-created animation with a reference count of 1, or %NULL
* if any of several error conditions ocurred: the file could not be opened,
* there was no loader for the file's format, there was not enough memory to
* allocate the image buffer, or the image file contained invalid data.
**/
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_file (const char *filename,
GError **error)
{
GdkPixbufAnimation *animation;
int size;
FILE *f;
guchar buffer [SNIFF_BUFFER_SIZE];
GdkPixbufModule *image_module;
gchar *display_name;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
display_name = g_filename_display_name (filename);
f = g_fopen (filename, "rb");
if (!f) {
gint save_errno = errno;
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to open file '%s': %s"),
display_name,
g_strerror (save_errno));
g_free (display_name);
return NULL;
}
size = fread (&buffer, 1, sizeof (buffer), f);
if (size == 0) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Image file '%s' contains no data"),
display_name);
g_free (display_name);
fclose (f);
return NULL;
}
image_module = _gdk_pixbuf_get_module (buffer, size, filename, error);
if (!image_module) {
g_free (display_name);
fclose (f);
return NULL;
}
if (image_module->module == NULL)
if (!_gdk_pixbuf_load_module (image_module, error)) {
g_free (display_name);
fclose (f);
return NULL;
}
if (image_module->load_animation != NULL) {
fseek (f, 0, SEEK_SET);
animation = (* image_module->load_animation) (f, error);
if (animation == NULL && error != NULL && *error == NULL) {
/* I don't trust these crufty longjmp()'ing
* image libs to maintain proper error
* invariants, and I don't want user code to
* segfault as a result. We need to maintain
* the invariant that error gets set if NULL
* is returned.
*/
g_warning ("Bug! gdk-pixbuf loader '%s' didn't set an error on failure.",
image_module->module_name);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load animation '%s': reason not known, probably a corrupt animation file"),
display_name);
}
fclose (f);
} else if (image_module->begin_load != NULL) {
guchar buffer[4096];
size_t length;
gpointer context;
gboolean success;
success = FALSE;
animation = NULL;
fseek (f, 0, SEEK_SET);
context = image_module->begin_load (NULL, prepared_notify, NULL, &animation, error);
if (!context)
goto fail_begin_load;
while (!feof (f) && !ferror (f)) {
length = fread (buffer, 1, sizeof (buffer), f);
if (length > 0) {
if (!image_module->load_increment (context, buffer, length, error)) {
error = NULL;
goto fail_load_increment;
}
}
}
success = TRUE;
fail_load_increment:
if (!image_module->stop_load (context, error))
success = FALSE;
fail_begin_load:
fclose (f);
if (success) {
/* If there was no error, there must be an animation that was successfully loaded */
g_assert (animation);
} else {
if (animation) {
g_object_unref (animation);
animation = NULL;
}
}
} else {
GdkPixbuf *pixbuf;
/* Keep this logic in sync with gdk_pixbuf_new_from_file() */
fseek (f, 0, SEEK_SET);
pixbuf = _gdk_pixbuf_generic_image_load (image_module, f, error);
fclose (f);
if (pixbuf == NULL && error != NULL && *error == NULL) {
/* I don't trust these crufty longjmp()'ing image libs
* to maintain proper error invariants, and I don't
* want user code to segfault as a result. We need to maintain
* the invariant that error gets set if NULL is returned.
*/
g_warning ("Bug! gdk-pixbuf loader '%s' didn't set an error on failure.",
image_module->module_name);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load image '%s': reason not known, probably a corrupt image file"),
display_name);
}
if (pixbuf == NULL) {
g_free (display_name);
animation = NULL;
goto out;
}
animation = gdk_pixbuf_non_anim_new (pixbuf);
g_object_unref (pixbuf);
}
g_free (display_name);
out:
return animation;
}
#ifdef G_OS_WIN32
#undef gdk_pixbuf_animation_new_from_file
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_file (const char *filename,
GError **error)
{
gchar *utf8_filename =
g_locale_to_utf8 (filename, -1, NULL, NULL, error);
GdkPixbufAnimation *retval;
if (utf8_filename == NULL)
return NULL;
retval = gdk_pixbuf_animation_new_from_file_utf8 (utf8_filename, error);
g_free (utf8_filename);
return retval;
}
#endif
/**
* gdk_pixbuf_animation_new_from_stream:
* @stream: a #GInputStream to load the pixbuf from
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
* @error: Return location for an error
*
* Creates a new animation by loading it from an input stream.
*
* The file format is detected automatically. If %NULL is returned, then
* @error will be set. The @cancellable can be used to abort the operation
* from another thread. If the operation was cancelled, the error
* %G_IO_ERROR_CANCELLED will be returned. Other possible errors are in
* the #GDK_PIXBUF_ERROR and %G_IO_ERROR domains.
*
* The stream is not closed.
*
* Return value: A newly-created pixbuf, or %NULL if any of several error
* conditions occurred: the file could not be opened, the image format is
* not supported, there was not enough memory to allocate the image buffer,
* the stream contained invalid data, or the operation was cancelled.
*
* Since: 2.28
**/
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_stream (GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
GdkPixbufAnimation *animation;
GdkPixbufLoader *loader;
gssize n_read;
guchar buffer[LOAD_BUFFER_SIZE];
gboolean res;
g_return_val_if_fail (G_IS_INPUT_STREAM (stream), NULL);
g_return_val_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
loader = gdk_pixbuf_loader_new ();
res = TRUE;
while (1) {
n_read = g_input_stream_read (stream,
buffer,
sizeof (buffer),
cancellable,
error);
if (n_read < 0) {
res = FALSE;
error = NULL; /* Ignore further errors */
break;
}
if (n_read == 0)
break;
if (!gdk_pixbuf_loader_write (loader,
buffer,
n_read,
error)) {
res = FALSE;
error = NULL;
break;
}
}
if (!gdk_pixbuf_loader_close (loader, error)) {
res = FALSE;
error = NULL;
}
if (res) {
animation = gdk_pixbuf_loader_get_animation (loader);
if (animation)
g_object_ref (animation);
} else {
animation = NULL;
}
g_object_unref (loader);
return animation;
}
static void
animation_new_from_stream_thread (GSimpleAsyncResult *result,
GInputStream *stream,
GCancellable *cancellable)
{
GdkPixbufAnimation *animation;
GError *error = NULL;
animation = gdk_pixbuf_animation_new_from_stream (stream, cancellable, &error);
/* Set the new pixbuf as the result, or error out */
if (animation == NULL) {
g_simple_async_result_take_error (result, error);
} else {
g_simple_async_result_set_op_res_gpointer (result, g_object_ref (animation), g_object_unref);
}
}
/**
* gdk_pixbuf_animation_new_from_stream_async:
* @stream: a #GInputStream from which to load the animation
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore
* @callback: a #GAsyncReadyCallback to call when the the pixbuf is loaded
* @user_data: the data to pass to the callback function
*
* Creates a new animation by asynchronously loading an image from an input stream.
*
* For more details see gdk_pixbuf_new_from_stream(), which is the synchronous
* version of this function.
*
* When the operation is finished, @callback will be called in the main thread.
* You can then call gdk_pixbuf_animation_new_from_stream_finish() to get the
* result of the operation.
*
* Since: 2.28
**/
void
gdk_pixbuf_animation_new_from_stream_async (GInputStream *stream,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
GSimpleAsyncResult *result;
g_return_if_fail (G_IS_INPUT_STREAM (stream));
g_return_if_fail (callback != NULL);
g_return_if_fail (!cancellable || G_IS_CANCELLABLE (cancellable));
result = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, gdk_pixbuf_animation_new_from_stream_async);
g_simple_async_result_run_in_thread (result, (GSimpleAsyncThreadFunc) animation_new_from_stream_thread, G_PRIORITY_DEFAULT, cancellable);
g_object_unref (result);
}
/**
* gdk_pixbuf_animation_new_from_stream_finish:
* @async_result: a #GAsyncResult
* @error: a #GError, or %NULL
*
* Finishes an asynchronous pixbuf animation creation operation started with
* gdk_pixbuf_animation_new_from_stream_async().
*
* Return value: a #GdkPixbufAnimation or %NULL on error. Free the returned
* object with g_object_unref().
*
* Since: 2.28
**/
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_stream_finish (GAsyncResult *async_result,
GError **error)
{
GSimpleAsyncResult *result = G_SIMPLE_ASYNC_RESULT (async_result);
g_return_val_if_fail (G_IS_ASYNC_RESULT (async_result), NULL);
g_return_val_if_fail (!error || (error && !*error), NULL);
g_warn_if_fail (g_simple_async_result_get_source_tag (result) == gdk_pixbuf_animation_new_from_stream_async);
if (g_simple_async_result_propagate_error (result, error))
return NULL;
return g_simple_async_result_get_op_res_gpointer (result);
}
/**
* gdk_pixbuf_animation_new_from_resource:
* @resource_path: the path of the resource file
* @error: Return location for an error
*
* Creates a new pixbuf animation by loading an image from an resource.
*
* The file format is detected automatically. If %NULL is returned, then
* @error will be set.
*
* Return value: A newly-created animation, or %NULL if any of several error
* conditions occurred: the file could not be opened, the image format is
* not supported, there was not enough memory to allocate the image buffer,
* the stream contained invalid data, or the operation was cancelled.
*
* Since: 2.28
**/
GdkPixbufAnimation *
gdk_pixbuf_animation_new_from_resource (const char *resource_path,
GError **error)
{
GInputStream *stream;
GdkPixbufAnimation *anim;
GdkPixbuf *pixbuf;
pixbuf = _gdk_pixbuf_new_from_resource_try_mmap (resource_path);
if (pixbuf) {
anim = gdk_pixbuf_non_anim_new (pixbuf);
g_object_unref (pixbuf);
return anim;
}
stream = g_resources_open_stream (resource_path, 0, error);
if (stream == NULL)
return NULL;
anim = gdk_pixbuf_animation_new_from_stream (stream, NULL, error);
g_object_unref (stream);
return anim;
}
/**
* gdk_pixbuf_animation_ref: (skip)
* @animation: An animation.
*
* Adds a reference to an animation.
*
* Return value: The same as the @animation argument.
*
* Deprecated: 2.0: Use g_object_ref().
**/
GdkPixbufAnimation *
gdk_pixbuf_animation_ref (GdkPixbufAnimation *animation)
{
return (GdkPixbufAnimation*) g_object_ref (animation);
}
/**
* gdk_pixbuf_animation_unref: (skip)
* @animation: An animation.
*
* Removes a reference from an animation.
*
* Deprecated: 2.0: Use g_object_unref().
**/
void
gdk_pixbuf_animation_unref (GdkPixbufAnimation *animation)
{
g_object_unref (animation);
}
/**
* gdk_pixbuf_animation_is_static_image:
* @animation: a #GdkPixbufAnimation
*
* If you load a file with gdk_pixbuf_animation_new_from_file() and it turns
* out to be a plain, unanimated image, then this function will return
* %TRUE. Use gdk_pixbuf_animation_get_static_image() to retrieve
* the image.
*
* Return value: %TRUE if the "animation" was really just an image
**/
gboolean
gdk_pixbuf_animation_is_static_image (GdkPixbufAnimation *animation)
{
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), FALSE);
return GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->is_static_image (animation);
}
/**
* gdk_pixbuf_animation_get_static_image:
* @animation: a #GdkPixbufAnimation
*
* If an animation is really just a plain image (has only one frame),
* this function returns that image. If the animation is an animation,
* this function returns a reasonable thing to display as a static
* unanimated image, which might be the first frame, or something more
* sophisticated. If an animation hasn't loaded any frames yet, this
* function will return %NULL.
*
* Return value: (transfer none): unanimated image representing the animation
**/
GdkPixbuf*
gdk_pixbuf_animation_get_static_image (GdkPixbufAnimation *animation)
{
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), NULL);
return GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_static_image (animation);
}
/**
* gdk_pixbuf_animation_get_width:
* @animation: An animation.
*
* Queries the width of the bounding box of a pixbuf animation.
*
* Return value: Width of the bounding box of the animation.
**/
int
gdk_pixbuf_animation_get_width (GdkPixbufAnimation *animation)
{
int width;
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), 0);
width = 0;
GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_size (animation,
&width, NULL);
return width;
}
/**
* gdk_pixbuf_animation_get_height:
* @animation: An animation.
*
* Queries the height of the bounding box of a pixbuf animation.
*
* Return value: Height of the bounding box of the animation.
**/
int
gdk_pixbuf_animation_get_height (GdkPixbufAnimation *animation)
{
int height;
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), 0);
height = 0;
GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_size (animation,
NULL, &height);
return height;
}
/**
* gdk_pixbuf_animation_get_iter:
* @animation: a #GdkPixbufAnimation
* @start_time: (allow-none): time when the animation starts playing
*
* Get an iterator for displaying an animation. The iterator provides
* the frames that should be displayed at a given time.
* It should be freed after use with g_object_unref().
*
* @start_time would normally come from g_get_current_time(), and
* marks the beginning of animation playback. After creating an
* iterator, you should immediately display the pixbuf returned by
* gdk_pixbuf_animation_iter_get_pixbuf(). Then, you should install a
* timeout (with g_timeout_add()) or by some other mechanism ensure
* that you'll update the image after
* gdk_pixbuf_animation_iter_get_delay_time() milliseconds. Each time
* the image is updated, you should reinstall the timeout with the new,
* possibly-changed delay time.
*
* As a shortcut, if @start_time is %NULL, the result of
* g_get_current_time() will be used automatically.
*
* To update the image (i.e. possibly change the result of
* gdk_pixbuf_animation_iter_get_pixbuf() to a new frame of the animation),
* call gdk_pixbuf_animation_iter_advance().
*
* If you're using #GdkPixbufLoader, in addition to updating the image
* after the delay time, you should also update it whenever you
* receive the area_updated signal and
* gdk_pixbuf_animation_iter_on_currently_loading_frame() returns
* %TRUE. In this case, the frame currently being fed into the loader
* has received new data, so needs to be refreshed. The delay time for
* a frame may also be modified after an area_updated signal, for
* example if the delay time for a frame is encoded in the data after
* the frame itself. So your timeout should be reinstalled after any
* area_updated signal.
*
* A delay time of -1 is possible, indicating "infinite."
*
* Return value: (transfer full): an iterator to move over the animation
**/
GdkPixbufAnimationIter*
gdk_pixbuf_animation_get_iter (GdkPixbufAnimation *animation,
const GTimeVal *start_time)
{
GTimeVal val;
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION (animation), NULL);
if (start_time)
val = *start_time;
else
g_get_current_time (&val);
return GDK_PIXBUF_ANIMATION_GET_CLASS (animation)->get_iter (animation, &val);
}
G_DEFINE_TYPE (GdkPixbufAnimationIter, gdk_pixbuf_animation_iter, G_TYPE_OBJECT);
static void
gdk_pixbuf_animation_iter_class_init (GdkPixbufAnimationIterClass *klass)
{
}
static void
gdk_pixbuf_animation_iter_init (GdkPixbufAnimationIter *iter)
{
}
/**
* gdk_pixbuf_animation_iter_get_delay_time:
* @iter: an animation iterator
*
* Gets the number of milliseconds the current pixbuf should be displayed,
* or -1 if the current pixbuf should be displayed forever. g_timeout_add()
* conveniently takes a timeout in milliseconds, so you can use a timeout
* to schedule the next update.
*
* Return value: delay time in milliseconds (thousandths of a second)
**/
int
gdk_pixbuf_animation_iter_get_delay_time (GdkPixbufAnimationIter *iter)
{
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), -1);
g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_delay_time, -1);
return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_delay_time (iter);
}
/**
* gdk_pixbuf_animation_iter_get_pixbuf:
* @iter: an animation iterator
*
* Gets the current pixbuf which should be displayed; the pixbuf might not
* be the same size as the animation itself
* (gdk_pixbuf_animation_get_width(), gdk_pixbuf_animation_get_height()).
* This pixbuf should be displayed for
* gdk_pixbuf_animation_iter_get_delay_time() milliseconds. The caller
* of this function does not own a reference to the returned pixbuf;
* the returned pixbuf will become invalid when the iterator advances
* to the next frame, which may happen anytime you call
* gdk_pixbuf_animation_iter_advance(). Copy the pixbuf to keep it
* (don't just add a reference), as it may get recycled as you advance
* the iterator.
*
* Return value: (transfer none): the pixbuf to be displayed
**/
GdkPixbuf*
gdk_pixbuf_animation_iter_get_pixbuf (GdkPixbufAnimationIter *iter)
{
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), NULL);
g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_pixbuf, NULL);
return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->get_pixbuf (iter);
}
/**
* gdk_pixbuf_animation_iter_on_currently_loading_frame:
* @iter: a #GdkPixbufAnimationIter
*
* Used to determine how to respond to the area_updated signal on
* #GdkPixbufLoader when loading an animation. area_updated is emitted
* for an area of the frame currently streaming in to the loader. So if
* you're on the currently loading frame, you need to redraw the screen for
* the updated area.
*
* Return value: %TRUE if the frame we're on is partially loaded, or the last frame
**/
gboolean
gdk_pixbuf_animation_iter_on_currently_loading_frame (GdkPixbufAnimationIter *iter)
{
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), FALSE);
g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->on_currently_loading_frame, FALSE);
return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->on_currently_loading_frame (iter);
}
/**
* gdk_pixbuf_animation_iter_advance:
* @iter: a #GdkPixbufAnimationIter
* @current_time: (allow-none): current time
*
* Possibly advances an animation to a new frame. Chooses the frame based
* on the start time passed to gdk_pixbuf_animation_get_iter().
*
* @current_time would normally come from g_get_current_time(), and
* must be greater than or equal to the time passed to
* gdk_pixbuf_animation_get_iter(), and must increase or remain
* unchanged each time gdk_pixbuf_animation_iter_get_pixbuf() is
* called. That is, you can't go backward in time; animations only
* play forward.
*
* As a shortcut, pass %NULL for the current time and g_get_current_time()
* will be invoked on your behalf. So you only need to explicitly pass
* @current_time if you're doing something odd like playing the animation
* at double speed.
*
* If this function returns %FALSE, there's no need to update the animation
* display, assuming the display had been rendered prior to advancing;
* if %TRUE, you need to call gdk_pixbuf_animation_iter_get_pixbuf()
* and update the display with the new pixbuf.
*
* Returns: %TRUE if the image may need updating
*
**/
gboolean
gdk_pixbuf_animation_iter_advance (GdkPixbufAnimationIter *iter,
const GTimeVal *current_time)
{
GTimeVal val;
g_return_val_if_fail (GDK_IS_PIXBUF_ANIMATION_ITER (iter), FALSE);
g_return_val_if_fail (GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->advance, FALSE);
if (current_time)
val = *current_time;
else
g_get_current_time (&val);
return GDK_PIXBUF_ANIMATION_ITER_GET_CLASS (iter)->advance (iter, &val);
}
static void gdk_pixbuf_non_anim_finalize (GObject *object);
static gboolean gdk_pixbuf_non_anim_is_static_image (GdkPixbufAnimation *animation);
static GdkPixbuf* gdk_pixbuf_non_anim_get_static_image (GdkPixbufAnimation *animation);
static void gdk_pixbuf_non_anim_get_size (GdkPixbufAnimation *anim,
int *width,
int *height);
static GdkPixbufAnimationIter* gdk_pixbuf_non_anim_get_iter (GdkPixbufAnimation *anim,
const GTimeVal *start_time);
G_DEFINE_TYPE (GdkPixbufNonAnim, gdk_pixbuf_non_anim, GDK_TYPE_PIXBUF_ANIMATION);
static void
gdk_pixbuf_non_anim_class_init (GdkPixbufNonAnimClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkPixbufAnimationClass *anim_class = GDK_PIXBUF_ANIMATION_CLASS (klass);
object_class->finalize = gdk_pixbuf_non_anim_finalize;
anim_class->is_static_image = gdk_pixbuf_non_anim_is_static_image;
anim_class->get_static_image = gdk_pixbuf_non_anim_get_static_image;
anim_class->get_size = gdk_pixbuf_non_anim_get_size;
anim_class->get_iter = gdk_pixbuf_non_anim_get_iter;
}
static void
gdk_pixbuf_non_anim_init (GdkPixbufNonAnim *non_anim)
{
}
static void
gdk_pixbuf_non_anim_finalize (GObject *object)
{
GdkPixbufNonAnim *non_anim = GDK_PIXBUF_NON_ANIM (object);
if (non_anim->pixbuf)
g_object_unref (non_anim->pixbuf);
G_OBJECT_CLASS (gdk_pixbuf_non_anim_parent_class)->finalize (object);
}
GdkPixbufAnimation*
gdk_pixbuf_non_anim_new (GdkPixbuf *pixbuf)
{
GdkPixbufNonAnim *non_anim;
non_anim = g_object_new (GDK_TYPE_PIXBUF_NON_ANIM, NULL);
non_anim->pixbuf = pixbuf;
if (pixbuf)
g_object_ref (pixbuf);
return GDK_PIXBUF_ANIMATION (non_anim);
}
static gboolean
gdk_pixbuf_non_anim_is_static_image (GdkPixbufAnimation *animation)
{
return TRUE;
}
static GdkPixbuf*
gdk_pixbuf_non_anim_get_static_image (GdkPixbufAnimation *animation)
{
GdkPixbufNonAnim *non_anim;
non_anim = GDK_PIXBUF_NON_ANIM (animation);
return non_anim->pixbuf;
}
static void
gdk_pixbuf_non_anim_get_size (GdkPixbufAnimation *anim,
int *width,
int *height)
{
GdkPixbufNonAnim *non_anim;
non_anim = GDK_PIXBUF_NON_ANIM (anim);
if (width)
*width = gdk_pixbuf_get_width (non_anim->pixbuf);
if (height)
*height = gdk_pixbuf_get_height (non_anim->pixbuf);
}
static GdkPixbufAnimationIter*
gdk_pixbuf_non_anim_get_iter (GdkPixbufAnimation *anim,
const GTimeVal *start_time)
{
GdkPixbufNonAnimIter *iter;
iter = g_object_new (GDK_TYPE_PIXBUF_NON_ANIM_ITER, NULL);
iter->non_anim = GDK_PIXBUF_NON_ANIM (anim);
g_object_ref (iter->non_anim);
return GDK_PIXBUF_ANIMATION_ITER (iter);
}
static void gdk_pixbuf_non_anim_iter_finalize (GObject *object);
static int gdk_pixbuf_non_anim_iter_get_delay_time (GdkPixbufAnimationIter *iter);
static GdkPixbuf* gdk_pixbuf_non_anim_iter_get_pixbuf (GdkPixbufAnimationIter *iter);
static gboolean gdk_pixbuf_non_anim_iter_on_currently_loading_frame (GdkPixbufAnimationIter *iter);
static gboolean gdk_pixbuf_non_anim_iter_advance (GdkPixbufAnimationIter *iter,
const GTimeVal *current_time);
G_DEFINE_TYPE (GdkPixbufNonAnimIter,
gdk_pixbuf_non_anim_iter,
GDK_TYPE_PIXBUF_ANIMATION_ITER);
static void
gdk_pixbuf_non_anim_iter_class_init (GdkPixbufNonAnimIterClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkPixbufAnimationIterClass *anim_iter_class =
GDK_PIXBUF_ANIMATION_ITER_CLASS (klass);
object_class->finalize = gdk_pixbuf_non_anim_iter_finalize;
anim_iter_class->get_delay_time = gdk_pixbuf_non_anim_iter_get_delay_time;
anim_iter_class->get_pixbuf = gdk_pixbuf_non_anim_iter_get_pixbuf;
anim_iter_class->on_currently_loading_frame = gdk_pixbuf_non_anim_iter_on_currently_loading_frame;
anim_iter_class->advance = gdk_pixbuf_non_anim_iter_advance;
}
static void
gdk_pixbuf_non_anim_iter_init (GdkPixbufNonAnimIter *non_iter)
{
}
static void
gdk_pixbuf_non_anim_iter_finalize (GObject *object)
{
GdkPixbufNonAnimIter *iter = GDK_PIXBUF_NON_ANIM_ITER (object);
g_object_unref (iter->non_anim);
G_OBJECT_CLASS (gdk_pixbuf_non_anim_iter_parent_class)->finalize (object);
}
static int
gdk_pixbuf_non_anim_iter_get_delay_time (GdkPixbufAnimationIter *iter)
{
return -1; /* show only frame forever */
}
static GdkPixbuf*
gdk_pixbuf_non_anim_iter_get_pixbuf (GdkPixbufAnimationIter *iter)
{
return GDK_PIXBUF_NON_ANIM_ITER (iter)->non_anim->pixbuf;
}
static gboolean
gdk_pixbuf_non_anim_iter_on_currently_loading_frame (GdkPixbufAnimationIter *iter)
{
return TRUE;
}
static gboolean
gdk_pixbuf_non_anim_iter_advance (GdkPixbufAnimationIter *iter,
const GTimeVal *current_time)
{
/* Advancing never requires a refresh */
return FALSE;
}
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