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d920a32a CB |
1 | /* gui_image.c - GUI component to display an image. */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
4 | * Copyright (C) 2008,2009 Free Software Foundation, Inc. | |
5 | * | |
6 | * GRUB is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * GRUB is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <grub/mm.h> | |
21 | #include <grub/misc.h> | |
22 | #include <grub/gui.h> | |
23 | #include <grub/gui_string_util.h> | |
24 | #include <grub/bitmap.h> | |
25 | #include <grub/bitmap_scale.h> | |
26 | ||
27 | struct grub_gui_image | |
28 | { | |
9a175884 | 29 | struct grub_gui_component component; |
d920a32a CB |
30 | |
31 | grub_gui_container_t parent; | |
32 | grub_video_rect_t bounds; | |
33 | char *id; | |
d920a32a CB |
34 | struct grub_video_bitmap *raw_bitmap; |
35 | struct grub_video_bitmap *bitmap; | |
36 | }; | |
37 | ||
38 | typedef struct grub_gui_image *grub_gui_image_t; | |
39 | ||
40 | static void | |
41 | image_destroy (void *vself) | |
42 | { | |
43 | grub_gui_image_t self = vself; | |
44 | ||
45 | /* Free the scaled bitmap, unless it's a reference to the raw bitmap. */ | |
46 | if (self->bitmap && (self->bitmap != self->raw_bitmap)) | |
47 | grub_video_bitmap_destroy (self->bitmap); | |
48 | if (self->raw_bitmap) | |
49 | grub_video_bitmap_destroy (self->raw_bitmap); | |
50 | ||
51 | grub_free (self); | |
52 | } | |
53 | ||
54 | static const char * | |
55 | image_get_id (void *vself) | |
56 | { | |
57 | grub_gui_image_t self = vself; | |
58 | return self->id; | |
59 | } | |
60 | ||
61 | static int | |
62 | image_is_instance (void *vself __attribute__((unused)), const char *type) | |
63 | { | |
64 | return grub_strcmp (type, "component") == 0; | |
65 | } | |
66 | ||
67 | static void | |
947fa16c | 68 | image_paint (void *vself, const grub_video_rect_t *region) |
d920a32a CB |
69 | { |
70 | grub_gui_image_t self = vself; | |
947fa16c VS |
71 | grub_video_rect_t vpsave; |
72 | ||
d920a32a CB |
73 | if (! self->bitmap) |
74 | return; | |
947fa16c VS |
75 | if (!grub_video_have_common_points (region, &self->bounds)) |
76 | return; | |
77 | ||
d920a32a CB |
78 | grub_gui_set_viewport (&self->bounds, &vpsave); |
79 | grub_video_blit_bitmap (self->bitmap, GRUB_VIDEO_BLIT_BLEND, | |
80 | 0, 0, 0, 0, | |
81 | grub_video_bitmap_get_width (self->bitmap), | |
82 | grub_video_bitmap_get_height (self->bitmap)); | |
83 | grub_gui_restore_viewport (&vpsave); | |
84 | } | |
85 | ||
86 | static void | |
87 | image_set_parent (void *vself, grub_gui_container_t parent) | |
88 | { | |
89 | grub_gui_image_t self = vself; | |
90 | self->parent = parent; | |
91 | } | |
92 | ||
93 | static grub_gui_container_t | |
94 | image_get_parent (void *vself) | |
95 | { | |
96 | grub_gui_image_t self = vself; | |
97 | return self->parent; | |
98 | } | |
99 | ||
100 | static grub_err_t | |
101 | rescale_image (grub_gui_image_t self) | |
102 | { | |
103 | if (! self->raw_bitmap) | |
104 | { | |
105 | if (self->bitmap) | |
106 | { | |
107 | grub_video_bitmap_destroy (self->bitmap); | |
108 | self->bitmap = 0; | |
109 | } | |
110 | return grub_errno; | |
111 | } | |
112 | ||
113 | unsigned width = self->bounds.width; | |
114 | unsigned height = self->bounds.height; | |
115 | ||
116 | if (self->bitmap | |
117 | && (grub_video_bitmap_get_width (self->bitmap) == width) | |
118 | && (grub_video_bitmap_get_height (self->bitmap) == height)) | |
119 | { | |
120 | /* Nothing to do; already the right size. */ | |
121 | return grub_errno; | |
122 | } | |
123 | ||
124 | /* Free any old scaled bitmap, | |
125 | *unless* it's a reference to the raw bitmap. */ | |
126 | if (self->bitmap && (self->bitmap != self->raw_bitmap)) | |
127 | grub_video_bitmap_destroy (self->bitmap); | |
128 | ||
129 | self->bitmap = 0; | |
130 | ||
131 | /* Create a scaled bitmap, unless the requested size is the same | |
132 | as the raw size -- in that case a reference is made. */ | |
133 | if (grub_video_bitmap_get_width (self->raw_bitmap) == width | |
134 | && grub_video_bitmap_get_height (self->raw_bitmap) == height) | |
135 | { | |
136 | self->bitmap = self->raw_bitmap; | |
137 | return grub_errno; | |
138 | } | |
139 | ||
140 | /* Don't scale to an invalid size. */ | |
141 | if (width == 0 || height == 0) | |
142 | return grub_errno; | |
143 | ||
144 | /* Create the scaled bitmap. */ | |
145 | grub_video_bitmap_create_scaled (&self->bitmap, | |
146 | width, | |
147 | height, | |
148 | self->raw_bitmap, | |
149 | GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST); | |
150 | if (grub_errno != GRUB_ERR_NONE) | |
151 | { | |
152 | grub_error_push (); | |
153 | grub_error (grub_errno, "failed to scale bitmap for image component"); | |
154 | } | |
155 | return grub_errno; | |
156 | } | |
157 | ||
158 | static void | |
159 | image_set_bounds (void *vself, const grub_video_rect_t *bounds) | |
160 | { | |
161 | grub_gui_image_t self = vself; | |
162 | self->bounds = *bounds; | |
163 | rescale_image (self); | |
164 | } | |
165 | ||
166 | static void | |
167 | image_get_bounds (void *vself, grub_video_rect_t *bounds) | |
168 | { | |
169 | grub_gui_image_t self = vself; | |
170 | *bounds = self->bounds; | |
171 | } | |
172 | ||
9a175884 | 173 | /* FIXME: inform rendering system it's not forced minimum. */ |
d920a32a | 174 | static void |
9a175884 | 175 | image_get_minimal_size (void *vself, unsigned *width, unsigned *height) |
d920a32a CB |
176 | { |
177 | grub_gui_image_t self = vself; | |
178 | ||
179 | if (self->raw_bitmap) | |
180 | { | |
181 | *width = grub_video_bitmap_get_width (self->raw_bitmap); | |
182 | *height = grub_video_bitmap_get_height (self->raw_bitmap); | |
183 | } | |
184 | else | |
185 | { | |
186 | *width = 0; | |
187 | *height = 0; | |
188 | } | |
d920a32a CB |
189 | } |
190 | ||
191 | static grub_err_t | |
192 | load_image (grub_gui_image_t self, const char *path) | |
193 | { | |
194 | struct grub_video_bitmap *bitmap; | |
195 | if (grub_video_bitmap_load (&bitmap, path) != GRUB_ERR_NONE) | |
196 | return grub_errno; | |
197 | ||
198 | if (self->bitmap && (self->bitmap != self->raw_bitmap)) | |
199 | grub_video_bitmap_destroy (self->bitmap); | |
200 | if (self->raw_bitmap) | |
201 | grub_video_bitmap_destroy (self->raw_bitmap); | |
202 | ||
203 | self->raw_bitmap = bitmap; | |
204 | return rescale_image (self); | |
205 | } | |
206 | ||
207 | static grub_err_t | |
208 | image_set_property (void *vself, const char *name, const char *value) | |
209 | { | |
210 | grub_gui_image_t self = vself; | |
211 | if (grub_strcmp (name, "file") == 0) | |
212 | return load_image (self, value); | |
d920a32a CB |
213 | else if (grub_strcmp (name, "id") == 0) |
214 | { | |
215 | grub_free (self->id); | |
216 | if (value) | |
217 | self->id = grub_strdup (value); | |
218 | else | |
219 | self->id = 0; | |
220 | } | |
221 | return grub_errno; | |
222 | } | |
223 | ||
224 | static struct grub_gui_component_ops image_ops = | |
225 | { | |
226 | .destroy = image_destroy, | |
227 | .get_id = image_get_id, | |
228 | .is_instance = image_is_instance, | |
229 | .paint = image_paint, | |
230 | .set_parent = image_set_parent, | |
231 | .get_parent = image_get_parent, | |
232 | .set_bounds = image_set_bounds, | |
233 | .get_bounds = image_get_bounds, | |
9a175884 | 234 | .get_minimal_size = image_get_minimal_size, |
d920a32a CB |
235 | .set_property = image_set_property |
236 | }; | |
237 | ||
238 | grub_gui_component_t | |
239 | grub_gui_image_new (void) | |
240 | { | |
241 | grub_gui_image_t image; | |
9a175884 | 242 | image = grub_zalloc (sizeof (*image)); |
d920a32a CB |
243 | if (! image) |
244 | return 0; | |
9a175884 | 245 | image->component.ops = &image_ops; |
d920a32a CB |
246 | return (grub_gui_component_t) image; |
247 | } | |
248 |