* Fixing some memory leaks. A few minor ones in AWeather and a major one in RSL
[grits] / src / plugin-ridge.c
1 /*
2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
3  * 
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  * 
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  * 
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 #include <config.h>
19 #include <gtk/gtk.h>
20 #include <curl/curl.h>
21 #include <GL/gl.h>
22
23 #include <stdio.h>
24
25 #include "aweather-gui.h"
26 #include "data.h"
27
28 enum {
29         LAYER_TOPO,
30         LAYER_COUNTY,
31         LAYER_RIVERS,
32         LAYER_HIGHWAYS,
33         LAYER_CITY,
34         LAYER_COUNT
35 };
36
37 typedef struct {
38         gchar *name;
39         gchar *fmt;
40         gboolean enabled;
41         float z;
42         guint tex;
43 } layer_t;
44
45 static layer_t layers[] = {
46         [LAYER_TOPO]     = { "Topo",     "Overlays/" "Topo/"     "Short/" "%s_Topo_Short.jpg",     TRUE,  1, 0 },
47         [LAYER_COUNTY]   = { "Counties", "Overlays/" "County/"   "Short/" "%s_County_Short.gif",   TRUE,  3, 0 },
48         [LAYER_RIVERS]   = { "Rivers",   "Overlays/" "Rivers/"   "Short/" "%s_Rivers_Short.gif",   FALSE, 4, 0 },
49         [LAYER_HIGHWAYS] = { "Highways", "Overlays/" "Highways/" "Short/" "%s_Highways_Short.gif", TRUE,  5, 0 },
50         [LAYER_CITY]     = { "Cities",   "Overlays/" "Cities/"   "Short/" "%s_City_Short.gif",     TRUE,  6, 0 },
51 };
52
53 static AWeatherGui *gui = NULL;
54
55 /**
56  * Load an image into an OpenGL texture
57  * \param  filename  Path to the image file
58  * \return The OpenGL identifier for the texture
59  */
60 void load_texture(gchar *filename, gpointer _layer)
61 {
62         layer_t *layer = _layer;
63         aweather_gui_gl_begin(gui);
64
65         /* Load image */
66         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
67         if (!pixbuf)
68                 g_warning("Failed to load texture: %s", filename);
69         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
70         int        width  = gdk_pixbuf_get_width(pixbuf);
71         int        height = gdk_pixbuf_get_height(pixbuf);
72         int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
73
74         /* Create Texture */
75         glGenTextures(1, &layer->tex);
76         glBindTexture(GL_TEXTURE_2D, layer->tex); // 2d texture (x and y size)
77
78         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
79         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
80                         format, GL_UNSIGNED_BYTE, pixels);
81         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
82         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
83
84         char *base = g_path_get_basename(filename);
85         g_message("loaded image:  w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
86                 width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
87                 base);
88         g_free(base);
89
90         aweather_gui_gl_end(gui);
91
92         /* Redraw */
93         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
94 }
95
96 static void set_site(AWeatherView *view, gchar *site, gpointer user_data)
97 {
98         g_message("location changed to %s", site);
99         for (int i = 0; i < LAYER_COUNT; i++) {
100                 gchar *base = "http://radar.weather.gov/ridge/";
101                 gchar *path  = g_strdup_printf(layers[i].fmt, site);
102                 cache_file(base, path, load_texture, &layers[i]);
103                 g_free(path);
104         }
105 }
106
107 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
108 {
109         g_message("ridge:expose");
110         glPushMatrix();
111         glEnable(GL_TEXTURE_2D);
112         glColor4f(1,1,1,1);
113
114         for (int i = 0; i < LAYER_COUNT; i++) {
115                 if (!layers[i].enabled)
116                         continue;
117                 glBindTexture(GL_TEXTURE_2D, layers[i].tex);
118                 glBegin(GL_POLYGON);
119                 glTexCoord2f(0.0, 0.0); glVertex3f(250*1000*-1.0, 250*1000* 1.0, layers[i].z);
120                 glTexCoord2f(0.0, 1.0); glVertex3f(250*1000*-1.0, 250*1000*-1.0, layers[i].z);
121                 glTexCoord2f(1.0, 1.0); glVertex3f(250*1000* 1.0, 250*1000*-1.0, layers[i].z);
122                 glTexCoord2f(1.0, 0.0); glVertex3f(250*1000* 1.0, 250*1000* 1.0, layers[i].z);
123                 glEnd();
124         }
125
126         glPopMatrix();
127         return FALSE;
128 }
129
130 void toggle_layer(GtkToggleButton *check, gpointer _layer)
131 {
132         layer_t *layer = _layer;
133         layer->enabled = gtk_toggle_button_get_active(check);
134         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
135 }
136
137 gboolean ridge_init(AWeatherGui *_gui)
138 {
139         gui = _gui;
140         AWeatherView *view    = aweather_gui_get_view(gui);
141         GtkWidget    *drawing = aweather_gui_get_widget(gui, "drawing");
142         GtkWidget    *config  = aweather_gui_get_widget(gui, "tabs");
143
144         /* Add configuration tab */
145         GtkWidget *tab  = gtk_label_new("Ridge");
146         GtkWidget *body = gtk_alignment_new(0.5, 0, 0, 0);
147         GtkWidget *hbox = gtk_hbox_new(FALSE, 10);
148         for (int i = 0; i < LAYER_COUNT; i++) {
149                 GtkWidget *check = gtk_check_button_new_with_label(layers[i].name);
150                 gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(check), layers[i].enabled);
151                 gtk_box_pack_start(GTK_BOX(hbox), check, FALSE, TRUE, 0);
152                 g_signal_connect(check, "toggled", G_CALLBACK(toggle_layer), &layers[i]);
153         }
154         gtk_container_add(GTK_CONTAINER(body), hbox);
155         gtk_notebook_append_page(GTK_NOTEBOOK(config), body, tab);
156
157         /* Set up OpenGL Stuff */
158         g_signal_connect(drawing, "expose-event",     G_CALLBACK(expose),    NULL);
159         g_signal_connect(view,    "location-changed", G_CALLBACK(set_site),  NULL);
160
161         return TRUE;
162 }