/* * Clutter. * * An OpenGL based 'interactive canvas' library. * * Authored By Matthew Allum * * Copyright (C) 2006 OpenedHand * * 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 . * * */ /** * SECTION:clutter-util * @short_description: Utility functions * * Various miscellaneous utilility functions. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include "clutter-main.h" #include "clutter-interval.h" #include "clutter-private.h" #include "deprecated/clutter-util.h" /** * clutter_util_next_p2: * @a: Value to get the next power * * Calculates the nearest power of two, greater than or equal to @a. * * Return value: The nearest power of two, greater or equal to @a. * * Deprecated: 1.2 */ gint clutter_util_next_p2 (gint a) { int rval = 1; while (rval < a) rval <<= 1; return rval; } /*< private > * _clutter_gettext: * @str: a string to localize * * Retrieves the localized version of @str, using the Clutter domain * * Return value: the translated string */ const gchar * _clutter_gettext (const gchar *str) { return g_dgettext (GETTEXT_PACKAGE, str); } /* Help macros to scale from OpenGL <-1,1> coordinates system to * window coordinates ranging [0,window-size] */ #define MTX_GL_SCALE_X(x,w,v1,v2) ((((((x) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2)) #define MTX_GL_SCALE_Y(y,w,v1,v2) ((v1) - (((((y) / (w)) + 1.0f) / 2.0f) * (v1)) + (v2)) #define MTX_GL_SCALE_Z(z,w,v1,v2) (MTX_GL_SCALE_X ((z), (w), (v1), (v2))) typedef struct _ClutterVertex4 { float x; float y; float z; float w; } ClutterVertex4; void _clutter_util_fully_transform_vertices (const CoglMatrix *modelview, const CoglMatrix *projection, const float *viewport, const ClutterVertex *vertices_in, ClutterVertex *vertices_out, int n_vertices) { CoglMatrix modelview_projection; ClutterVertex4 *vertices_tmp; int i; vertices_tmp = g_alloca (sizeof (ClutterVertex4) * n_vertices); if (n_vertices >= 4) { /* XXX: we should find a way to cache this per actor */ cogl_matrix_multiply (&modelview_projection, projection, modelview); cogl_matrix_project_points (&modelview_projection, 3, sizeof (ClutterVertex), vertices_in, sizeof (ClutterVertex4), vertices_tmp, n_vertices); } else { cogl_matrix_transform_points (modelview, 3, sizeof (ClutterVertex), vertices_in, sizeof (ClutterVertex4), vertices_tmp, n_vertices); cogl_matrix_project_points (projection, 3, sizeof (ClutterVertex4), vertices_tmp, sizeof (ClutterVertex4), vertices_tmp, n_vertices); } for (i = 0; i < n_vertices; i++) { ClutterVertex4 vertex_tmp = vertices_tmp[i]; ClutterVertex *vertex_out = &vertices_out[i]; /* Finally translate from OpenGL coords to window coords */ vertex_out->x = MTX_GL_SCALE_X (vertex_tmp.x, vertex_tmp.w, viewport[2], viewport[0]); vertex_out->y = MTX_GL_SCALE_Y (vertex_tmp.y, vertex_tmp.w, viewport[3], viewport[1]); } } /*< private > * _clutter_util_rectangle_union: * @src1: first rectangle to union * @src2: second rectangle to union * @dest: (out): return location for the unioned rectangle * * Calculates the union of two rectangles. * * The union of rectangles @src1 and @src2 is the smallest rectangle which * includes both @src1 and @src2 within it. * * It is allowed for @dest to be the same as either @src1 or @src2. * * This function should really be in Cairo. */ void _clutter_util_rectangle_union (const cairo_rectangle_int_t *src1, const cairo_rectangle_int_t *src2, cairo_rectangle_int_t *dest) { int dest_x, dest_y; dest_x = MIN (src1->x, src2->x); dest_y = MIN (src1->y, src2->y); dest->width = MAX (src1->x + src1->width, src2->x + src2->width) - dest_x; dest->height = MAX (src1->y + src1->height, src2->y + src2->height) - dest_y; dest->x = dest_x; dest->y = dest_y; } typedef struct { GType value_type; ClutterProgressFunc func; } ProgressData; G_LOCK_DEFINE_STATIC (progress_funcs); static GHashTable *progress_funcs = NULL; gboolean _clutter_has_progress_function (GType gtype) { const char *type_name = g_type_name (gtype); if (progress_funcs == NULL) return FALSE; return g_hash_table_lookup (progress_funcs, type_name) != NULL; } gboolean _clutter_run_progress_function (GType gtype, const GValue *initial, const GValue *final, gdouble progress, GValue *retval) { ProgressData *pdata; gboolean res; G_LOCK (progress_funcs); if (G_UNLIKELY (progress_funcs == NULL)) { res = FALSE; goto out; } pdata = g_hash_table_lookup (progress_funcs, g_type_name (gtype)); if (G_UNLIKELY (pdata == NULL)) { res = FALSE; goto out; } res = pdata->func (initial, final, progress, retval); out: G_UNLOCK (progress_funcs); return res; } static void progress_data_destroy (gpointer data_) { g_slice_free (ProgressData, data_); } /** * clutter_interval_register_progress_func: (skip) * @value_type: a #GType * @func: a #ClutterProgressFunc, or %NULL to unset a previously * set progress function * * Sets the progress function for a given @value_type, like: * * |[ * clutter_interval_register_progress_func (MY_TYPE_FOO, * my_foo_progress); * ]| * * Whenever a #ClutterInterval instance using the default * #ClutterInterval::compute_value implementation is set as an * interval between two #GValue of type @value_type, it will call * @func to establish the value depending on the given progress, * for instance: * * |[ * static gboolean * my_int_progress (const GValue *a, * const GValue *b, * gdouble progress, * GValue *retval) * { * gint ia = g_value_get_int (a); * gint ib = g_value_get_int (b); * gint res = factor * (ib - ia) + ia; * * g_value_set_int (retval, res); * * return TRUE; * } * * clutter_interval_register_progress_func (G_TYPE_INT, my_int_progress); * ]| * * To unset a previously set progress function of a #GType, pass %NULL * for @func. * * Since: 1.0 */ void clutter_interval_register_progress_func (GType value_type, ClutterProgressFunc func) { ProgressData *progress_func; const char *type_name; g_return_if_fail (value_type != G_TYPE_INVALID); type_name = g_type_name (value_type); G_LOCK (progress_funcs); if (G_UNLIKELY (progress_funcs == NULL)) progress_funcs = g_hash_table_new_full (NULL, NULL, NULL, progress_data_destroy); progress_func = g_hash_table_lookup (progress_funcs, type_name); if (G_UNLIKELY (progress_func)) { if (func == NULL) { g_hash_table_remove (progress_funcs, type_name); g_slice_free (ProgressData, progress_func); } else progress_func->func = func; } else { progress_func = g_slice_new (ProgressData); progress_func->value_type = value_type; progress_func->func = func; g_hash_table_replace (progress_funcs, (gpointer) type_name, progress_func); } G_UNLOCK (progress_funcs); }