/* -*- 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 * Miguel de Icaza * Federico Mena-Quintero * * 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 . */ /** * GdkPixbuf: * * A pixel buffer. * * `GdkPixbuf` contains information about an image's pixel data, * its color space, bits per sample, width and height, and the * rowstride (the number of bytes between the start of one row * and the start of the next). * * ## Creating new `GdkPixbuf` * * The most basic way to create a pixbuf is to wrap an existing pixel * buffer with a [class@GdkPixbuf.Pixbuf] instance. You can use the * [`ctor@GdkPixbuf.Pixbuf.new_from_data`] function to do this. * * Every time you create a new `GdkPixbuf` instance for some data, you * will need to specify the destroy notification function that will be * called when the data buffer needs to be freed; this will happen when * a `GdkPixbuf` is finalized by the reference counting functions. If * you have a chunk of static data compiled into your application, you * can pass in `NULL` as the destroy notification function so that the * data will not be freed. * * The [`ctor@GdkPixbuf.Pixbuf.new`] constructor function can be used * as a convenience to create a pixbuf with an empty buffer; this is * equivalent to allocating a data buffer using `malloc()` and then * wrapping it with `gdk_pixbuf_new_from_data()`. The `gdk_pixbuf_new()` * function will compute an optimal rowstride so that rendering can be * performed with an efficient algorithm. * * As a special case, you can use the [`ctor@GdkPixbuf.Pixbuf.new_from_xpm_data`] * function to create a pixbuf from inline XPM image data. * * You can also copy an existing pixbuf with the [method@Pixbuf.copy] * function. This is not the same as just acquiring a reference to * the old pixbuf instance: the copy function will actually duplicate * the pixel data in memory and create a new [class@Pixbuf] instance * for it. * * ## Reference counting * * `GdkPixbuf` structures are reference counted. This means that an * application can share a single pixbuf among many parts of the * code. When a piece of the program needs to use a pixbuf, it should * acquire a reference to it by calling `g_object_ref()`; when it no * longer needs the pixbuf, it should release the reference it acquired * by calling `g_object_unref()`. The resources associated with a * `GdkPixbuf` will be freed when its reference count drops to zero. * Newly-created `GdkPixbuf` instances start with a reference count * of one. * * ## Image Data * * Image data in a pixbuf is stored in memory in an uncompressed, * packed format. Rows in the image are stored top to bottom, and * in each row pixels are stored from left to right. * * There may be padding at the end of a row. * * The "rowstride" value of a pixbuf, as returned by [`method@GdkPixbuf.Pixbuf.get_rowstride`], * indicates the number of bytes between rows. * * **NOTE**: If you are copying raw pixbuf data with `memcpy()` note that the * last row in the pixbuf may not be as wide as the full rowstride, but rather * just as wide as the pixel data needs to be; that is: it is unsafe to do * `memcpy (dest, pixels, rowstride * height)` to copy a whole pixbuf. Use * [method@GdkPixbuf.Pixbuf.copy] instead, or compute the width in bytes of the * last row as: * * ```c * last_row = width * ((n_channels * bits_per_sample + 7) / 8); * ``` * * The same rule applies when iterating over each row of a `GdkPixbuf` pixels * array. * * The following code illustrates a simple `put_pixel()` * function for RGB pixbufs with 8 bits per channel with an alpha * channel. * * ```c * static void * put_pixel (GdkPixbuf *pixbuf, * int x, * int y, * guchar red, * guchar green, * guchar blue, * guchar alpha) * { * int n_channels = gdk_pixbuf_get_n_channels (pixbuf); * * // Ensure that the pixbuf is valid * g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB); * g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8); * g_assert (gdk_pixbuf_get_has_alpha (pixbuf)); * g_assert (n_channels == 4); * * int width = gdk_pixbuf_get_width (pixbuf); * int height = gdk_pixbuf_get_height (pixbuf); * * // Ensure that the coordinates are in a valid range * g_assert (x >= 0 && x < width); * g_assert (y >= 0 && y < height); * * int rowstride = gdk_pixbuf_get_rowstride (pixbuf); * * // The pixel buffer in the GdkPixbuf instance * guchar *pixels = gdk_pixbuf_get_pixels (pixbuf); * * // The pixel we wish to modify * guchar *p = pixels + y * rowstride + x * n_channels; * p[0] = red; * p[1] = green; * p[2] = blue; * p[3] = alpha; * } * ``` * * ## Loading images * * The `GdkPixBuf` class provides a simple mechanism for loading * an image from a file in synchronous and asynchronous fashion. * * For GUI applications, it is recommended to use the asynchronous * stream API to avoid blocking the control flow of the application. * * Additionally, `GdkPixbuf` provides the [class@GdkPixbuf.PixbufLoader`] * API for progressive image loading. * * ## Saving images * * The `GdkPixbuf` class provides methods for saving image data in * a number of file formats. The formatted data can be written to a * file or to a memory buffer. `GdkPixbuf` can also call a user-defined * callback on the data, which allows to e.g. write the image * to a socket or store it in a database. */ #include "config.h" #include #include #include #define GDK_PIXBUF_C_COMPILATION #include "gdk-pixbuf-private.h" #include "gdk-pixbuf-features.h" #include "gdk-pixbuf-enum-types.h" /* Include the marshallers */ #include #include #include "gdk-pixbuf-marshal.h" static void gdk_pixbuf_finalize (GObject *object); static void gdk_pixbuf_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gdk_pixbuf_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void gdk_pixbuf_constructed (GObject *object); enum { PROP_0, PROP_COLORSPACE, PROP_N_CHANNELS, PROP_HAS_ALPHA, PROP_BITS_PER_SAMPLE, PROP_WIDTH, PROP_HEIGHT, PROP_ROWSTRIDE, PROP_PIXELS, PROP_PIXEL_BYTES }; static void gdk_pixbuf_icon_iface_init (GIconIface *iface); static void gdk_pixbuf_loadable_icon_iface_init (GLoadableIconIface *iface); G_DEFINE_TYPE_WITH_CODE (GdkPixbuf, gdk_pixbuf, G_TYPE_OBJECT, G_IMPLEMENT_INTERFACE (G_TYPE_ICON, gdk_pixbuf_icon_iface_init) G_IMPLEMENT_INTERFACE (G_TYPE_LOADABLE_ICON, gdk_pixbuf_loadable_icon_iface_init)) static void gdk_pixbuf_init (GdkPixbuf *pixbuf) { pixbuf->colorspace = GDK_COLORSPACE_RGB; pixbuf->n_channels = 3; pixbuf->bits_per_sample = 8; pixbuf->has_alpha = FALSE; pixbuf->storage = STORAGE_UNINITIALIZED; } static void gdk_pixbuf_class_init (GdkPixbufClass *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); _gdk_pixbuf_init_gettext (); object_class->finalize = gdk_pixbuf_finalize; object_class->set_property = gdk_pixbuf_set_property; object_class->get_property = gdk_pixbuf_get_property; object_class->constructed = gdk_pixbuf_constructed; #define PIXBUF_PARAM_FLAGS G_PARAM_READWRITE|G_PARAM_CONSTRUCT_ONLY|\ G_PARAM_EXPLICIT_NOTIFY|\ G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB /** * GdkPixbuf:n-channels: * * The number of samples per pixel. * * Currently, only 3 or 4 samples per pixel are supported. */ g_object_class_install_property (object_class, PROP_N_CHANNELS, g_param_spec_int ("n-channels", _("Number of Channels"), _("The number of samples per pixel"), 0, G_MAXINT, 3, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:colorspace: * * The color space of the pixbuf. * * Currently, only `GDK_COLORSPACE_RGB` is supported. */ g_object_class_install_property (object_class, PROP_COLORSPACE, g_param_spec_enum ("colorspace", _("Colorspace"), _("The colorspace in which the samples are interpreted"), GDK_TYPE_COLORSPACE, GDK_COLORSPACE_RGB, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:has-alpha: * * Whether the pixbuf has an alpha channel. */ g_object_class_install_property (object_class, PROP_HAS_ALPHA, g_param_spec_boolean ("has-alpha", _("Has Alpha"), _("Whether the pixbuf has an alpha channel"), FALSE, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:bits-per-sample: * * The number of bits per sample. * * Currently only 8 bit per sample are supported. */ g_object_class_install_property (object_class, PROP_BITS_PER_SAMPLE, g_param_spec_int ("bits-per-sample", _("Bits per Sample"), _("The number of bits per sample"), 1, 16, 8, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:width: * * The number of columns of the pixbuf. */ g_object_class_install_property (object_class, PROP_WIDTH, g_param_spec_int ("width", _("Width"), _("The number of columns of the pixbuf"), 1, G_MAXINT, 1, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:height: * * The number of rows of the pixbuf. */ g_object_class_install_property (object_class, PROP_HEIGHT, g_param_spec_int ("height", _("Height"), _("The number of rows of the pixbuf"), 1, G_MAXINT, 1, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:rowstride: * * The number of bytes between the start of a row and * the start of the next row. * * This number must (obviously) be at least as large as the * width of the pixbuf. */ g_object_class_install_property (object_class, PROP_ROWSTRIDE, g_param_spec_int ("rowstride", _("Rowstride"), _("The number of bytes between the start of a row and the start of the next row"), 1, G_MAXINT, 1, PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf:pixels: * * A pointer to the pixel data of the pixbuf. */ g_object_class_install_property (object_class, PROP_PIXELS, g_param_spec_pointer ("pixels", _("Pixels"), _("A pointer to the pixel data of the pixbuf"), PIXBUF_PARAM_FLAGS)); /** * GdkPixbuf::pixel-bytes: * * If set, this pixbuf was created from read-only #GBytes. * * Replaces GdkPixbuf::pixels. * * Since: 2.32 */ g_object_class_install_property (object_class, PROP_PIXEL_BYTES, g_param_spec_boxed ("pixel-bytes", _("Pixel Bytes"), _("Readonly pixel data"), G_TYPE_BYTES, PIXBUF_PARAM_FLAGS)); } static void free_pixels (GdkPixbuf *pixbuf) { g_assert (pixbuf->storage == STORAGE_PIXELS); if (pixbuf->s.pixels.pixels && pixbuf->s.pixels.destroy_fn) { (* pixbuf->s.pixels.destroy_fn) (pixbuf->s.pixels.pixels, pixbuf->s.pixels.destroy_fn_data); } pixbuf->s.pixels.pixels = NULL; } static void free_bytes (GdkPixbuf *pixbuf) { g_assert (pixbuf->storage == STORAGE_BYTES); g_clear_pointer (&pixbuf->s.bytes.bytes, g_bytes_unref); } static void gdk_pixbuf_finalize (GObject *object) { GdkPixbuf *pixbuf = GDK_PIXBUF (object); switch (pixbuf->storage) { case STORAGE_PIXELS: free_pixels (pixbuf); break; case STORAGE_BYTES: free_bytes (pixbuf); break; default: g_assert_not_reached (); } G_OBJECT_CLASS (gdk_pixbuf_parent_class)->finalize (object); } /** * gdk_pixbuf_ref: (skip) * @pixbuf: A pixbuf. * * Adds a reference to a pixbuf. * * Return value: The same as the @pixbuf argument. * * Deprecated: 2.0: Use g_object_ref(). **/ GdkPixbuf * gdk_pixbuf_ref (GdkPixbuf *pixbuf) { return (GdkPixbuf *) g_object_ref (pixbuf); } /** * gdk_pixbuf_unref: (skip) * @pixbuf: A pixbuf. * * Removes a reference from a pixbuf. * * Deprecated: 2.0: Use g_object_unref(). **/ void gdk_pixbuf_unref (GdkPixbuf *pixbuf) { g_object_unref (pixbuf); } static GBytes * gdk_pixbuf_make_bytes (GdkPixbuf *pixbuf, GError **error) { gchar *buffer; gsize size; if (!gdk_pixbuf_save_to_buffer (pixbuf, &buffer, &size, "png", error, NULL)) return NULL; return g_bytes_new_take (buffer, size); } static GVariant * gdk_pixbuf_serialize (GIcon *icon) { GError *error = NULL; GVariant *result; GBytes *bytes; bytes = gdk_pixbuf_make_bytes (GDK_PIXBUF (icon), &error); if (!bytes) { g_critical ("Unable to serialise GdkPixbuf to png (via g_icon_serialize()): %s", error->message); g_error_free (error); return NULL; } result = g_variant_new_from_bytes (G_VARIANT_TYPE_BYTESTRING, bytes, TRUE); g_bytes_unref (bytes); return g_variant_new ("(sv)", "bytes", result); } static GInputStream * gdk_pixbuf_load (GLoadableIcon *icon, int size, char **type, GCancellable *cancellable, GError **error) { GInputStream *stream; GBytes *bytes; bytes = gdk_pixbuf_make_bytes (GDK_PIXBUF (icon), error); if (!bytes) return NULL; stream = g_memory_input_stream_new_from_bytes (bytes); g_bytes_unref (bytes); if (type) *type = g_strdup ("image/png"); return stream; } static void gdk_pixbuf_load_async (GLoadableIcon *icon, int size, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GTask *task; task = g_task_new (icon, cancellable, callback, user_data); g_task_return_pointer (task, icon, NULL); g_object_unref (task); } static GInputStream * gdk_pixbuf_load_finish (GLoadableIcon *icon, GAsyncResult *res, char **type, GError **error) { g_return_val_if_fail (g_task_is_valid (res, icon), NULL); if (!g_task_propagate_pointer (G_TASK (res), error)) return NULL; return gdk_pixbuf_load (icon, 0, type, NULL, error); } static void gdk_pixbuf_loadable_icon_iface_init (GLoadableIconIface *iface) { iface->load = gdk_pixbuf_load; /* In theory encoding a png could be time-consuming but we're talking * about icons here, so assume it's probably going to be OK and handle * the async variant of the call in-thread instead of having the * default implementation dispatch it to a worker. */ iface->load_async = gdk_pixbuf_load_async; iface->load_finish = gdk_pixbuf_load_finish; } static void gdk_pixbuf_icon_iface_init (GIconIface *iface) { iface->hash = (guint (*) (GIcon *)) g_direct_hash; iface->equal = (gboolean (*) (GIcon *, GIcon *)) g_direct_equal; iface->serialize = gdk_pixbuf_serialize; } /* Used as the destroy notification function for gdk_pixbuf_new() */ static void free_buffer (guchar *pixels, gpointer data) { g_free (pixels); } /** * gdk_pixbuf_calculate_rowstride: * @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, must be > 0 * @height: Height of image in pixels, must be > 0 * * Calculates the rowstride that an image created with those values would * have. * * This function is useful for front-ends and backends that want to check * image values without needing to create a `GdkPixbuf`. * * Return value: the rowstride for the given values, or -1 in case of error. * * Since: 2.36.8 */ gint gdk_pixbuf_calculate_rowstride (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample, int width, int height) { unsigned int channels; g_return_val_if_fail (colorspace == GDK_COLORSPACE_RGB, -1); g_return_val_if_fail (bits_per_sample == 8, -1); g_return_val_if_fail (width > 0, -1); g_return_val_if_fail (height > 0, -1); channels = has_alpha ? 4 : 3; /* Overflow? */ if (width > (G_MAXINT - 3) / channels) return -1; /* Always align rows to 32-bit boundaries */ return (width * channels + 3) & ~3; } /** * 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, must be > 0 * @height: Height of image in pixels, must be > 0 * * Creates a new `GdkPixbuf` structure and allocates a buffer for it. * * If the allocation of the buffer failed, this function will return `NULL`. * * The buffer has an optimal rowstride. Note that the buffer is not cleared; * you will have to fill it completely yourself. * * Return value: (transfer full) (nullable): A newly-created pixel buffer **/ GdkPixbuf * gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample, int width, int height) { guchar *buf; int rowstride; rowstride = gdk_pixbuf_calculate_rowstride (colorspace, has_alpha, bits_per_sample, width, height); if (rowstride <= 0) return NULL; buf = g_try_malloc_n (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`. * * Note that this does not copy the options set on the original `GdkPixbuf`, * use gdk_pixbuf_copy_options() for this. * * Return value: (nullable) (transfer full): A newly-created pixbuf **/ GdkPixbuf * gdk_pixbuf_copy (const GdkPixbuf *pixbuf) { guchar *buf; int size; g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL); /* Calculate a semi-exact size. Here we copy with full rowstrides; * maybe we should copy each row individually with the minimum * rowstride? */ size = gdk_pixbuf_get_byte_length (pixbuf); buf = g_try_malloc (size); if (!buf) return NULL; memcpy (buf, gdk_pixbuf_read_pixels (pixbuf), 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. * * Note that if `src_pixbuf` is read-only, this function will force it * to be mutable. * * Return value: (transfer full): 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); /* Note causes an implicit copy where src_pixbuf owns the data */ 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 (GDK_IS_PIXBUF (pixbuf), 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 (GDK_IS_PIXBUF (pixbuf), -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 (GDK_IS_PIXBUF (pixbuf), FALSE); 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 (GDK_IS_PIXBUF (pixbuf), -1); return pixbuf->bits_per_sample; } /** * gdk_pixbuf_get_pixels: * @pixbuf: A pixbuf. * * Queries a pointer to the pixel data of a pixbuf. * * This function will cause an implicit copy of the pixbuf data if the * pixbuf was created from read-only data. * * Please see the section on [image data](class.Pixbuf.html#image-data) for information * about how the pixel data is stored in memory. * * Return value: (array): A pointer to the pixbuf's pixel data. **/ guchar * gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf) { return gdk_pixbuf_get_pixels_with_length (pixbuf, NULL); } static void downgrade_to_pixels (const GdkPixbuf *pixbuf) { switch (pixbuf->storage) { case STORAGE_PIXELS: return; case STORAGE_BYTES: { GdkPixbuf *mut_pixbuf = (GdkPixbuf *) pixbuf; gsize len; Pixels pixels; pixels.pixels = g_bytes_unref_to_data (pixbuf->s.bytes.bytes, &len); pixels.destroy_fn = free_buffer; pixels.destroy_fn_data = NULL; mut_pixbuf->storage = STORAGE_PIXELS; mut_pixbuf->s.pixels = pixels; break; } default: g_assert_not_reached (); } } /** * gdk_pixbuf_get_pixels_with_length: (rename-to gdk_pixbuf_get_pixels) * @pixbuf: A pixbuf. * @length: (out): The length of the binary data. * * Queries a pointer to the pixel data of a pixbuf. * * This function will cause an implicit copy of the pixbuf data if the * pixbuf was created from read-only data. * * Please see the section on [image data](class.Pixbuf.html#image-data) for information * about how the pixel data is stored in memory. * * Return value: (array length=length): A pointer to the pixbuf's * pixel data. * * Since: 2.26 */ guchar * gdk_pixbuf_get_pixels_with_length (const GdkPixbuf *pixbuf, guint *length) { g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL); downgrade_to_pixels (pixbuf); g_assert (pixbuf->storage == STORAGE_PIXELS); if (length) *length = gdk_pixbuf_get_byte_length (pixbuf); return pixbuf->s.pixels.pixels; } /** * gdk_pixbuf_read_pixels: * @pixbuf: A pixbuf * * Provides a read-only pointer to the raw pixel data. * * This function allows skipping the implicit copy that must be made * if gdk_pixbuf_get_pixels() is called on a read-only pixbuf. * * Returns: a read-only pointer to the raw pixel data * * Since: 2.32 */ const guint8* gdk_pixbuf_read_pixels (const GdkPixbuf *pixbuf) { g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL); switch (pixbuf->storage) { case STORAGE_PIXELS: return pixbuf->s.pixels.pixels; case STORAGE_BYTES: { gsize len; /* Ignore len; callers know the size via other variables */ return g_bytes_get_data (pixbuf->s.bytes.bytes, &len); } default: g_assert_not_reached (); return NULL; } } /** * gdk_pixbuf_read_pixel_bytes: * @pixbuf: A pixbuf * * Provides a #GBytes buffer containing the raw pixel data; the data * must not be modified. * * This function allows skipping the implicit copy that must be made * if gdk_pixbuf_get_pixels() is called on a read-only pixbuf. * * Returns: (transfer full): A new reference to a read-only copy of * the pixel data. Note that for mutable pixbufs, this function will * incur a one-time copy of the pixel data for conversion into the * returned #GBytes. * * Since: 2.32 */ GBytes * gdk_pixbuf_read_pixel_bytes (const GdkPixbuf *pixbuf) { g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL); switch (pixbuf->storage) { case STORAGE_PIXELS: return g_bytes_new (pixbuf->s.pixels.pixels, gdk_pixbuf_get_byte_length (pixbuf)); case STORAGE_BYTES: return g_bytes_ref (pixbuf->s.bytes.bytes); default: g_assert_not_reached (); } } /** * 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 (GDK_IS_PIXBUF (pixbuf), -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 (GDK_IS_PIXBUF (pixbuf), -1); return pixbuf->height; } /** * gdk_pixbuf_get_rowstride: * @pixbuf: A pixbuf. * * Queries the rowstride of a pixbuf, which is the number of bytes between * the start of a row and the start of the next row. * * Return value: Distance between row starts. **/ int gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf) { g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1); return pixbuf->rowstride; } /** * gdk_pixbuf_get_byte_length: * @pixbuf: A pixbuf * * Returns the length of the pixel data, in bytes. * * Return value: The length of the pixel data. * * Since: 2.26 */ gsize gdk_pixbuf_get_byte_length (const GdkPixbuf *pixbuf) { g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), -1); return ((pixbuf->height - 1) * pixbuf->rowstride + pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) / 8)); } /* 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) { return g_quark_from_static_string ("gdk-pixbuf-error-quark"); } /** * gdk_pixbuf_fill: * @pixbuf: a `GdkPixbuf` * @pixel: RGBA pixel to used to clear (`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 component will be ignored if the pixbuf doesn't have an alpha * channel. */ void gdk_pixbuf_fill (GdkPixbuf *pixbuf, guint32 pixel) { guchar *pixels; guint r, g, b, a; guchar *p; guint w, h; g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); if (pixbuf->width == 0 || pixbuf->height == 0) return; /* Force an implicit copy */ pixels = gdk_pixbuf_get_pixels (pixbuf); r = (pixel & 0xff000000) >> 24; g = (pixel & 0x00ff0000) >> 16; b = (pixel & 0x0000ff00) >> 8; a = (pixel & 0x000000ff); h = pixbuf->height; while (h--) { w = pixbuf->width; p = pixels; switch (pixbuf->n_channels) { case 3: while (w--) { p[0] = r; p[1] = g; p[2] = b; p += 3; } break; case 4: while (w--) { p[0] = r; p[1] = g; p[2] = b; p[3] = a; p += 4; } break; default: break; } pixels += pixbuf->rowstride; } } /** * 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, or that may have been attached by another * function using gdk_pixbuf_set_option(). * * For instance, the ANI loader provides "Title" and "Artist" options. * The ICO, XBM, and XPM loaders provide "x_hot" and "y_hot" hot-spot * options for cursor definitions. The PNG loader provides the tEXt ancillary * chunk key/value pairs as options. Since 2.12, the TIFF and JPEG loaders * return an "orientation" option string that corresponds to the embedded * TIFF/Exif orientation tag (if present). Since 2.32, the TIFF loader sets * the "multipage" option string to "yes" when a multi-page TIFF is loaded. * Since 2.32 the JPEG and PNG loaders set "x-dpi" and "y-dpi" if the file * contains image density information in dots per inch. * Since 2.36.6, the JPEG loader sets the "comment" option with the comment * EXIF tag. * * Return value: (transfer none) (nullable): the value associated with `key` **/ const 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_get_options: * @pixbuf: a `GdkPixbuf` * * Returns a `GHashTable` with a list of all the options that may have been * attached to the `pixbuf` when it was loaded, or that may have been * attached by another function using [method@GdkPixbuf.Pixbuf.set_option]. * * Return value: (transfer container) (element-type utf8 utf8): a #GHashTable * of key/values pairs * * Since: 2.32 **/ GHashTable * gdk_pixbuf_get_options (GdkPixbuf *pixbuf) { GHashTable *ht; gchar **options; g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL); ht = g_hash_table_new (g_str_hash, g_str_equal); options = g_object_get_qdata (G_OBJECT (pixbuf), g_quark_from_static_string ("gdk_pixbuf_options")); if (options) { gint i; for (i = 0; options[2*i]; i++) g_hash_table_insert (ht, options[2*i], options[2*i+1]); } return ht; } /** * gdk_pixbuf_remove_option: * @pixbuf: a `GdkPixbuf` * @key: a nul-terminated string representing the key to remove. * * Removes the key/value pair option attached to a `GdkPixbuf`. * * Return value: `TRUE` if an option was removed, `FALSE` if not. * * Since: 2.36 **/ gboolean gdk_pixbuf_remove_option (GdkPixbuf *pixbuf, const gchar *key) { GQuark quark; gchar **options; guint n; GPtrArray *array; gboolean found; g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), FALSE); g_return_val_if_fail (key != NULL, FALSE); quark = g_quark_from_static_string ("gdk_pixbuf_options"); options = g_object_get_qdata (G_OBJECT (pixbuf), quark); if (!options) return FALSE; g_object_steal_qdata (G_OBJECT (pixbuf), quark); /* There's at least a nul-terminator */ array = g_ptr_array_new_full (1, g_free); found = FALSE; for (n = 0; options[2*n]; n++) { if (strcmp (options[2*n], key) != 0) { g_ptr_array_add (array, g_strdup (options[2*n])); /* key */ g_ptr_array_add (array, g_strdup (options[2*n+1])); /* value */ } else { found = TRUE; } } if (array->len == 0) { g_ptr_array_unref (array); g_strfreev (options); return found; } if (!found) { g_ptr_array_free (array, TRUE); g_object_set_qdata_full (G_OBJECT (pixbuf), quark, options, (GDestroyNotify) g_strfreev); return FALSE; } g_ptr_array_add (array, NULL); g_object_set_qdata_full (G_OBJECT (pixbuf), quark, g_ptr_array_free (array, FALSE), (GDestroyNotify) g_strfreev); g_strfreev (options); return TRUE; } /** * 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 the `pixbuf`, * the new value is ignored and `FALSE` is returned. * * Return value: `TRUE` on success * * Since: 2.2 **/ 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; } /** * gdk_pixbuf_copy_options: * @src_pixbuf: the source pixbuf * @dest_pixbuf: the destination pixbuf * * Copies the key/value pair options attached to a `GdkPixbuf` to another * `GdkPixbuf`. * * This is useful to keep original metadata after having manipulated * a file. However be careful to remove metadata which you've already * applied, such as the "orientation" option after rotating the image. * * Return value: `TRUE` on success. * * Since: 2.36 **/ gboolean gdk_pixbuf_copy_options (GdkPixbuf *src_pixbuf, GdkPixbuf *dest_pixbuf) { GQuark quark; gchar **options; g_return_val_if_fail (GDK_IS_PIXBUF (src_pixbuf), FALSE); g_return_val_if_fail (GDK_IS_PIXBUF (dest_pixbuf), FALSE); quark = g_quark_from_static_string ("gdk_pixbuf_options"); options = g_object_dup_qdata (G_OBJECT (src_pixbuf), quark, (GDuplicateFunc) g_strdupv, NULL); if (options == NULL) return TRUE; g_object_set_qdata_full (G_OBJECT (dest_pixbuf), quark, options, (GDestroyNotify) g_strfreev); return TRUE; } static void gdk_pixbuf_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GdkPixbuf *pixbuf = GDK_PIXBUF (object); gboolean notify = TRUE; switch (prop_id) { case PROP_COLORSPACE: notify = pixbuf->colorspace != g_value_get_enum (value); pixbuf->colorspace = g_value_get_enum (value); break; case PROP_N_CHANNELS: notify = pixbuf->n_channels != g_value_get_int (value); pixbuf->n_channels = g_value_get_int (value); break; case PROP_HAS_ALPHA: notify = pixbuf->has_alpha != g_value_get_boolean (value); pixbuf->has_alpha = g_value_get_boolean (value); break; case PROP_BITS_PER_SAMPLE: notify = pixbuf->bits_per_sample != g_value_get_int (value); pixbuf->bits_per_sample = g_value_get_int (value); break; case PROP_WIDTH: notify = pixbuf->width != g_value_get_int (value); pixbuf->width = g_value_get_int (value); break; case PROP_HEIGHT: notify = pixbuf->height != g_value_get_int (value); pixbuf->height = g_value_get_int (value); break; case PROP_ROWSTRIDE: notify = pixbuf->rowstride != g_value_get_int (value); pixbuf->rowstride = g_value_get_int (value); break; /* The following two are a bit strange. Both PROP_PIXELS and * PROP_PIXEL_BYTES are G_PARAM_CONSTRUCT_ONLY properties, which means * that GObject will generate default values for any missing one and * call us for *both*. So, we need to check whether the passed value is * not NULL before actually setting pixbuf->storage. */ case PROP_PIXELS: { guchar *pixels = g_value_get_pointer (value); if (pixels) { g_assert (pixbuf->storage == STORAGE_UNINITIALIZED); pixbuf->storage = STORAGE_PIXELS; pixbuf->s.pixels.pixels = pixels; pixbuf->s.pixels.destroy_fn = NULL; pixbuf->s.pixels.destroy_fn_data = NULL; } else { notify = FALSE; } break; } case PROP_PIXEL_BYTES: { GBytes *bytes = g_value_get_boxed (value); if (bytes) { g_assert (pixbuf->storage == STORAGE_UNINITIALIZED); pixbuf->storage = STORAGE_BYTES; pixbuf->s.bytes.bytes = g_value_dup_boxed (value); } else { notify = FALSE; } break; } default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } if (notify) g_object_notify_by_pspec (G_OBJECT (object), pspec); } static void gdk_pixbuf_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GdkPixbuf *pixbuf = GDK_PIXBUF (object); switch (prop_id) { case PROP_COLORSPACE: g_value_set_enum (value, gdk_pixbuf_get_colorspace (pixbuf)); break; case PROP_N_CHANNELS: g_value_set_int (value, gdk_pixbuf_get_n_channels (pixbuf)); break; case PROP_HAS_ALPHA: g_value_set_boolean (value, gdk_pixbuf_get_has_alpha (pixbuf)); break; case PROP_BITS_PER_SAMPLE: g_value_set_int (value, gdk_pixbuf_get_bits_per_sample (pixbuf)); break; case PROP_WIDTH: g_value_set_int (value, gdk_pixbuf_get_width (pixbuf)); break; case PROP_HEIGHT: g_value_set_int (value, gdk_pixbuf_get_height (pixbuf)); break; case PROP_ROWSTRIDE: g_value_set_int (value, gdk_pixbuf_get_rowstride (pixbuf)); break; case PROP_PIXELS: g_value_set_pointer (value, gdk_pixbuf_get_pixels (pixbuf)); break; case PROP_PIXEL_BYTES: g_value_set_boxed (value, gdk_pixbuf_read_pixel_bytes (pixbuf)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void make_storage_invalid (GdkPixbuf *pixbuf) { char *buf; gsize bufsize = 3; buf = g_new0(char, bufsize); pixbuf->storage = STORAGE_BYTES; pixbuf->s.bytes.bytes = g_bytes_new_with_free_func (buf, bufsize, g_free, NULL); pixbuf->colorspace = GDK_COLORSPACE_RGB; pixbuf->n_channels = 3; pixbuf->bits_per_sample = 8; pixbuf->width = 1; pixbuf->height = 1; pixbuf->rowstride = 3; pixbuf->has_alpha = FALSE; } static void gdk_pixbuf_constructed (GObject *object) { GdkPixbuf *pixbuf = GDK_PIXBUF (object); G_OBJECT_CLASS (gdk_pixbuf_parent_class)->constructed (object); switch (pixbuf->storage) { case STORAGE_UNINITIALIZED: /* This means that neither of the construct properties "pixels" nor "pixel-bytes" * was specified during a call to g_object_new(). * * To avoid breaking ABI, we don't emit this warning. We'll want * to emit it once we can have fallible construction. * * g_warning ("pixbuf needs to be constructed with the 'pixels' or 'pixel-bytes' properties"); */ make_storage_invalid (pixbuf); break; case STORAGE_PIXELS: g_assert (pixbuf->s.pixels.pixels != NULL); break; case STORAGE_BYTES: { gsize bytes_size; gint width, height; gboolean has_alpha; g_assert (pixbuf->s.bytes.bytes != NULL); bytes_size = g_bytes_get_size (pixbuf->s.bytes.bytes); width = pixbuf->width; height = pixbuf->height; has_alpha = pixbuf->has_alpha; /* This is the same check as in gdk_pixbuf_new_from_bytes() */ if (!(bytes_size >= width * height * (has_alpha ? 4 : 3))) { g_error ("GBytes is too small to fit the pixbuf's declared width and height"); } break; } default: g_assert_not_reached (); } g_assert (pixbuf->storage != STORAGE_UNINITIALIZED); }