/* -*- 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, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #include #include #include #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. * * Return value: The same as the @pixbuf argument. * * Deprecated: Use g_object_ref(). **/ GdkPixbuf * gdk_pixbuf_ref (GdkPixbuf *pixbuf) { return (GdkPixbuf *) g_object_ref (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 (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; gsize bytes; 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); if (width <= 0 || height <= 0) return NULL; channels = has_alpha ? 4 : 3; rowstride = width * channels; if (rowstride / channels != width || rowstride + 3 < 0) /* overflow */ return NULL; /* Always align rows to 32-bit boundaries */ rowstride = (rowstride + 3) & ~3; bytes = height * rowstride; if (bytes / rowstride != height) /* overflow */ return NULL; buf = g_try_malloc (bytes); 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; 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; pixels = pixbuf->pixels; 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. * * 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. * * 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; } /* Include the marshallers */ #include #include "gdk-pixbuf-marshal.c"