/* GdkPixbuf library - GdkPixbuf data structure * * Copyright (C) 2003 The Free Software Foundation * * Authors: Mark Crichton * Miguel de Icaza * Federico Mena-Quintero * Havoc Pennington * * 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. */ #ifndef GDK_PIXBUF_CORE_H #define GDK_PIXBUF_CORE_H #if defined(GDK_PIXBUF_DISABLE_SINGLE_INCLUDES) && !defined (GDK_PIXBUF_H_INSIDE) && !defined (GDK_PIXBUF_COMPILATION) #error "Only can be included directly." #endif #include #include #include G_BEGIN_DECLS /** * SECTION:gdk-pixbuf * @Short_description: Information that describes an image. * @Title: The GdkPixbuf Structure * * * The #GdkPixbuf structure contains * information that describes an image in memory. * * *
* Image Data * * Image data in a pixbuf is stored in memory in 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 gdk_pixbuf_get_rowstride(), indicates the number * of bytes between rows. * * * * put_pixel(<!-- -->) example * * * The following code illustrates a simple put_pixel() * function for RGB pixbufs with 8 bits per channel with an alpha * channel. It is not included in the gdk-pixbuf library for * performance reasons; rather than making several function calls * for each pixel, your own code can take shortcuts. * * * * static void * put_pixel (GdkPixbuf *pixbuf, int x, int y, guchar red, guchar green, guchar blue, guchar alpha) * { * int width, height, rowstride, n_channels; * guchar *pixels, *p; * * n_channels = gdk_pixbuf_get_n_channels (pixbuf); * * 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); * * width = gdk_pixbuf_get_width (pixbuf); * height = gdk_pixbuf_get_height (pixbuf); * * g_assert (x >= 0 && x < width); * g_assert (y >= 0 && y < height); * * rowstride = gdk_pixbuf_get_rowstride (pixbuf); * pixels = gdk_pixbuf_get_pixels (pixbuf); * * p = pixels + y * rowstride + x * n_channels; * p[0] = red; * p[1] = green; * p[2] = blue; * p[3] = alpha; * } * * * This function will not work for pixbufs with images that are * other than 8 bits per sample or channel, but it will work for * most of the pixbufs that GTK+ uses. * * * * * If you are doing memcpy() of raw pixbuf data, 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 gdk_pixbuf_copy() instead, or compute the width in bytes * of the last row as width * ((n_channels * * bits_per_sample + 7) / 8). * * *
*/ /** * GdkPixbufAlphaMode: * @GDK_PIXBUF_ALPHA_BILEVEL: A bilevel clipping mask (black and white) * will be created and used to draw the image. Pixels below 0.5 opacity * will be considered fully transparent, and all others will be * considered fully opaque. * @GDK_PIXBUF_ALPHA_FULL: For now falls back to #GDK_PIXBUF_ALPHA_BILEVEL. * In the future it will do full alpha compositing. * * These values can be passed to * gdk_pixbuf_render_to_drawable_alpha() to control how the alpha * channel of an image should be handled. This function can create a * bilevel clipping mask (black and white) and use it while painting * the image. In the future, when the X Window System gets an alpha * channel extension, it will be possible to do full alpha * compositing onto arbitrary drawables. For now both cases fall * back to a bilevel clipping mask. */ typedef enum { GDK_PIXBUF_ALPHA_BILEVEL, GDK_PIXBUF_ALPHA_FULL } GdkPixbufAlphaMode; /** * GdkColorspace: * @GDK_COLORSPACE_RGB: Indicates a red/green/blue additive color space. * * This enumeration defines the color spaces that are supported by * the &gdk-pixbuf; library. Currently only RGB is supported. */ /* Note that these values are encoded in inline pixbufs * as ints, so don't reorder them */ typedef enum { GDK_COLORSPACE_RGB } GdkColorspace; /* All of these are opaque structures */ /** * GdkPixbuf: * * This is the main structure in the &gdk-pixbuf; library. It is * used to represent images. It contains information about the * 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). */ typedef struct _GdkPixbuf GdkPixbuf; #define GDK_TYPE_PIXBUF (gdk_pixbuf_get_type ()) #define GDK_PIXBUF(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GDK_TYPE_PIXBUF, GdkPixbuf)) #define GDK_IS_PIXBUF(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GDK_TYPE_PIXBUF)) /** * GdkPixbufDestroyNotify: * @pixels: (array) (element-type guint8): The pixel array of the pixbuf * that is being finalized. * @data: (closure): User closure data. * * A function of this type is responsible for freeing the pixel array * of a pixbuf. The gdk_pixbuf_new_from_data() function lets you * pass in a pre-allocated pixel array so that a pixbuf can be * created from it; in this case you will need to pass in a function * of #GdkPixbufDestroyNotify so that the pixel data can be freed * when the pixbuf is finalized. */ typedef void (* GdkPixbufDestroyNotify) (guchar *pixels, gpointer data); /** * GDK_PIXBUF_ERROR: * * Error domain used for pixbuf operations. Indicates that the error code * will be in the #GdkPixbufError enumeration. See #GError for * information on error domains and error codes. */ #define GDK_PIXBUF_ERROR gdk_pixbuf_error_quark () /** * GdkPixbufError: * @GDK_PIXBUF_ERROR_CORRUPT_IMAGE: An image file was broken somehow. * @GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY: Not enough memory. * @GDK_PIXBUF_ERROR_BAD_OPTION: A bad option was passed to a pixbuf save module. * @GDK_PIXBUF_ERROR_UNKNOWN_TYPE: Unknown image type. * @GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION: Don't know how to perform the * given operation on the type of image at hand. * @GDK_PIXBUF_ERROR_FAILED: Generic failure code, something went wrong. * * An error code in the #GDK_PIXBUF_ERROR domain. Many &gdk-pixbuf; * operations can cause errors in this domain, or in the #G_FILE_ERROR * domain. */ typedef enum { /* image data hosed */ GDK_PIXBUF_ERROR_CORRUPT_IMAGE, /* no mem to load image */ GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY, /* bad option passed to save routine */ GDK_PIXBUF_ERROR_BAD_OPTION, /* unsupported image type (sort of an ENOSYS) */ GDK_PIXBUF_ERROR_UNKNOWN_TYPE, /* unsupported operation (load, save) for image type */ GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION, GDK_PIXBUF_ERROR_FAILED } GdkPixbufError; GQuark gdk_pixbuf_error_quark (void); GType gdk_pixbuf_get_type (void) G_GNUC_CONST; /* Reference counting */ #ifndef GDK_PIXBUF_DISABLE_DEPRECATED G_DEPRECATED_FOR(g_object_ref) GdkPixbuf *gdk_pixbuf_ref (GdkPixbuf *pixbuf); G_DEPRECATED_FOR(g_object_unref) void gdk_pixbuf_unref (GdkPixbuf *pixbuf); #endif /* GdkPixbuf accessors */ GdkColorspace gdk_pixbuf_get_colorspace (const GdkPixbuf *pixbuf); int gdk_pixbuf_get_n_channels (const GdkPixbuf *pixbuf); gboolean gdk_pixbuf_get_has_alpha (const GdkPixbuf *pixbuf); int gdk_pixbuf_get_bits_per_sample (const GdkPixbuf *pixbuf); guchar *gdk_pixbuf_get_pixels (const GdkPixbuf *pixbuf); int gdk_pixbuf_get_width (const GdkPixbuf *pixbuf); int gdk_pixbuf_get_height (const GdkPixbuf *pixbuf); int gdk_pixbuf_get_rowstride (const GdkPixbuf *pixbuf); gsize gdk_pixbuf_get_byte_length (const GdkPixbuf *pixbuf); guchar *gdk_pixbuf_get_pixels_with_length (const GdkPixbuf *pixbuf, guint *length); /* Create a blank pixbuf with an optimal rowstride and a new buffer */ GdkPixbuf *gdk_pixbuf_new (GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample, int width, int height); /* Copy a pixbuf */ GdkPixbuf *gdk_pixbuf_copy (const GdkPixbuf *pixbuf); /* Create a pixbuf which points to the pixels of another pixbuf */ GdkPixbuf *gdk_pixbuf_new_subpixbuf (GdkPixbuf *src_pixbuf, int src_x, int src_y, int width, int height); /* Simple loading */ #ifndef __GTK_DOC_IGNORE__ #ifdef G_OS_WIN32 /* DLL ABI stability hack. */ #define gdk_pixbuf_new_from_file gdk_pixbuf_new_from_file_utf8 #define gdk_pixbuf_new_from_file_at_size gdk_pixbuf_new_from_file_at_size_utf8 #define gdk_pixbuf_new_from_file_at_scale gdk_pixbuf_new_from_file_at_scale_utf8 #endif #endif GdkPixbuf *gdk_pixbuf_new_from_file (const char *filename, GError **error); GdkPixbuf *gdk_pixbuf_new_from_file_at_size (const char *filename, int width, int height, GError **error); GdkPixbuf *gdk_pixbuf_new_from_file_at_scale (const char *filename, int width, int height, gboolean preserve_aspect_ratio, GError **error); GdkPixbuf *gdk_pixbuf_new_from_resource (const char *resource_path, GError **error); GdkPixbuf *gdk_pixbuf_new_from_resource_at_scale (const char *resource_path, int width, int height, gboolean preserve_aspect_ratio, GError **error); GdkPixbuf *gdk_pixbuf_new_from_data (const guchar *data, GdkColorspace colorspace, gboolean has_alpha, int bits_per_sample, int width, int height, int rowstride, GdkPixbufDestroyNotify destroy_fn, gpointer destroy_fn_data); GdkPixbuf *gdk_pixbuf_new_from_xpm_data (const char **data); GdkPixbuf* gdk_pixbuf_new_from_inline (gint data_length, const guint8 *data, gboolean copy_pixels, GError **error); /* Mutations */ void gdk_pixbuf_fill (GdkPixbuf *pixbuf, guint32 pixel); /* Saving */ #ifndef __GTK_DOC_IGNORE__ #ifdef G_OS_WIN32 /* DLL ABI stability hack. */ #define gdk_pixbuf_save gdk_pixbuf_save_utf8 #define gdk_pixbuf_savev gdk_pixbuf_savev_utf8 #endif #endif gboolean gdk_pixbuf_save (GdkPixbuf *pixbuf, const char *filename, const char *type, GError **error, ...) G_GNUC_NULL_TERMINATED; gboolean gdk_pixbuf_savev (GdkPixbuf *pixbuf, const char *filename, const char *type, char **option_keys, char **option_values, GError **error); /* Saving to a callback function */ /** * GdkPixbufSaveFunc: * @buf: (array length=count) (element-type guint8): bytes to be written. * @count: number of bytes in @buf. * @error: (out): A location to return an error. * @data: (closure): user data passed to gdk_pixbuf_save_to_callback(). * * Specifies the type of the function passed to * gdk_pixbuf_save_to_callback(). It is called once for each block of * bytes that is "written" by gdk_pixbuf_save_to_callback(). If * successful it should return %TRUE. If an error occurs it should set * @error and return %FALSE, in which case gdk_pixbuf_save_to_callback() * will fail with the same error. * * Since: 2.4 * Returns: %TRUE if successful, %FALSE (with @error set) if failed. */ typedef gboolean (*GdkPixbufSaveFunc) (const gchar *buf, gsize count, GError **error, gpointer data); gboolean gdk_pixbuf_save_to_callback (GdkPixbuf *pixbuf, GdkPixbufSaveFunc save_func, gpointer user_data, const char *type, GError **error, ...) G_GNUC_NULL_TERMINATED; gboolean gdk_pixbuf_save_to_callbackv (GdkPixbuf *pixbuf, GdkPixbufSaveFunc save_func, gpointer user_data, const char *type, char **option_keys, char **option_values, GError **error); /* Saving into a newly allocated char array */ gboolean gdk_pixbuf_save_to_buffer (GdkPixbuf *pixbuf, gchar **buffer, gsize *buffer_size, const char *type, GError **error, ...) G_GNUC_NULL_TERMINATED; gboolean gdk_pixbuf_save_to_bufferv (GdkPixbuf *pixbuf, gchar **buffer, gsize *buffer_size, const char *type, char **option_keys, char **option_values, GError **error); GdkPixbuf *gdk_pixbuf_new_from_stream (GInputStream *stream, GCancellable *cancellable, GError **error); void gdk_pixbuf_new_from_stream_async (GInputStream *stream, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); GdkPixbuf *gdk_pixbuf_new_from_stream_finish (GAsyncResult *async_result, GError **error); GdkPixbuf *gdk_pixbuf_new_from_stream_at_scale (GInputStream *stream, gint width, gint height, gboolean preserve_aspect_ratio, GCancellable *cancellable, GError **error); void gdk_pixbuf_new_from_stream_at_scale_async (GInputStream *stream, gint width, gint height, gboolean preserve_aspect_ratio, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data); gboolean gdk_pixbuf_save_to_stream (GdkPixbuf *pixbuf, GOutputStream *stream, const char *type, GCancellable *cancellable, GError **error, ...); void gdk_pixbuf_save_to_stream_async (GdkPixbuf *pixbuf, GOutputStream *stream, const gchar *type, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data, ...); gboolean gdk_pixbuf_save_to_stream_finish (GAsyncResult *async_result, GError **error); /* Adding an alpha channel */ GdkPixbuf *gdk_pixbuf_add_alpha (const GdkPixbuf *pixbuf, gboolean substitute_color, guchar r, guchar g, guchar b); /* Copy an area of a pixbuf onto another one */ void gdk_pixbuf_copy_area (const GdkPixbuf *src_pixbuf, int src_x, int src_y, int width, int height, GdkPixbuf *dest_pixbuf, int dest_x, int dest_y); /* Brighten/darken and optionally make it pixelated-looking */ void gdk_pixbuf_saturate_and_pixelate (const GdkPixbuf *src, GdkPixbuf *dest, gfloat saturation, gboolean pixelate); /* Transform an image to agree with its embedded orientation option / tag */ GdkPixbuf *gdk_pixbuf_apply_embedded_orientation (GdkPixbuf *src); const gchar * gdk_pixbuf_get_option (GdkPixbuf *pixbuf, const gchar *key); G_END_DECLS #endif /* GDK_PIXBUF_CORE_H */