1 | /* |
2 | * Copyright © 2018 Benjamin Otte |
3 | * |
4 | * This library is free software; you can redistribute it and/or |
5 | * modify it under the terms of the GNU Lesser General Public |
6 | * License as published by the Free Software Foundation; either |
7 | * version 2.1 of the License, or (at your option) any later version. |
8 | * |
9 | * This library 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 GNU |
12 | * Lesser General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU Lesser General Public |
15 | * License along with this library. If not, see <http://www.gnu.org/licenses/>. |
16 | * |
17 | * Authors: Benjamin Otte <otte@gnome.org> |
18 | */ |
19 | |
20 | #include "config.h" |
21 | |
22 | #include "gdkmemorytextureprivate.h" |
23 | |
24 | #include "gdkmemoryformatprivate.h" |
25 | #include "gsk/gl/fp16private.h" |
26 | |
27 | /** |
28 | * GdkMemoryTexture: |
29 | * |
30 | * A `GdkTexture` representing image data in memory. |
31 | */ |
32 | |
33 | struct _GdkMemoryTexture |
34 | { |
35 | GdkTexture parent_instance; |
36 | |
37 | GBytes *bytes; |
38 | gsize stride; |
39 | }; |
40 | |
41 | struct _GdkMemoryTextureClass |
42 | { |
43 | GdkTextureClass parent_class; |
44 | }; |
45 | |
46 | G_DEFINE_TYPE (GdkMemoryTexture, gdk_memory_texture, GDK_TYPE_TEXTURE) |
47 | |
48 | static void |
49 | gdk_memory_texture_dispose (GObject *object) |
50 | { |
51 | GdkMemoryTexture *self = GDK_MEMORY_TEXTURE (object); |
52 | |
53 | g_clear_pointer (&self->bytes, g_bytes_unref); |
54 | |
55 | G_OBJECT_CLASS (gdk_memory_texture_parent_class)->dispose (object); |
56 | } |
57 | |
58 | static void |
59 | gdk_memory_texture_download (GdkTexture *texture, |
60 | GdkMemoryFormat format, |
61 | guchar *data, |
62 | gsize stride) |
63 | { |
64 | GdkMemoryTexture *self = GDK_MEMORY_TEXTURE (texture); |
65 | |
66 | gdk_memory_convert (dest_data: data, dest_stride: stride, |
67 | dest_format: format, |
68 | src_data: (guchar *) g_bytes_get_data (bytes: self->bytes, NULL), |
69 | src_stride: self->stride, |
70 | src_format: texture->format, |
71 | width: gdk_texture_get_width (texture), |
72 | height: gdk_texture_get_height (texture)); |
73 | } |
74 | |
75 | static void |
76 | gdk_memory_texture_class_init (GdkMemoryTextureClass *klass) |
77 | { |
78 | GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass); |
79 | GObjectClass *gobject_class = G_OBJECT_CLASS (klass); |
80 | |
81 | texture_class->download = gdk_memory_texture_download; |
82 | |
83 | gobject_class->dispose = gdk_memory_texture_dispose; |
84 | } |
85 | |
86 | static void |
87 | gdk_memory_texture_init (GdkMemoryTexture *self) |
88 | { |
89 | } |
90 | |
91 | static GBytes * |
92 | gdk_memory_sanitize (GBytes *bytes, |
93 | int width, |
94 | int height, |
95 | GdkMemoryFormat format, |
96 | gsize stride, |
97 | gsize *out_stride) |
98 | { |
99 | gsize align, size, copy_stride, bpp; |
100 | const guchar *data; |
101 | guchar *copy; |
102 | int y; |
103 | |
104 | data = g_bytes_get_data (bytes, size: &size); |
105 | align = gdk_memory_format_alignment (format); |
106 | |
107 | if (GPOINTER_TO_SIZE (data) % align == 0 && |
108 | stride % align == 0) |
109 | { |
110 | *out_stride = stride; |
111 | return g_bytes_ref (bytes); |
112 | } |
113 | |
114 | bpp = gdk_memory_format_bytes_per_pixel (format); |
115 | copy_stride = bpp * width; |
116 | /* align to multiples of 4, just to be sure */ |
117 | copy_stride = (copy_stride + 3) & ~3; |
118 | copy = g_malloc (n_bytes: copy_stride * height); |
119 | for (y = 0; y < height; y++) |
120 | memcpy (dest: copy + y * copy_stride, src: data + y * stride, n: bpp * width); |
121 | |
122 | *out_stride = copy_stride; |
123 | return g_bytes_new_take (data: copy, size: copy_stride * height); |
124 | } |
125 | |
126 | /** |
127 | * gdk_memory_texture_new: |
128 | * @width: the width of the texture |
129 | * @height: the height of the texture |
130 | * @format: the format of the data |
131 | * @bytes: the `GBytes` containing the pixel data |
132 | * @stride: rowstride for the data |
133 | * |
134 | * Creates a new texture for a blob of image data. |
135 | * |
136 | * The `GBytes` must contain @stride × @height pixels |
137 | * in the given format. |
138 | * |
139 | * Returns: (type GdkMemoryTexture): A newly-created `GdkTexture` |
140 | */ |
141 | GdkTexture * |
142 | gdk_memory_texture_new (int width, |
143 | int height, |
144 | GdkMemoryFormat format, |
145 | GBytes *bytes, |
146 | gsize stride) |
147 | { |
148 | GdkMemoryTexture *self; |
149 | |
150 | g_return_val_if_fail (width > 0, NULL); |
151 | g_return_val_if_fail (height > 0, NULL); |
152 | g_return_val_if_fail (bytes != NULL, NULL); |
153 | g_return_val_if_fail (stride >= width * gdk_memory_format_bytes_per_pixel (format), NULL); |
154 | |
155 | bytes = gdk_memory_sanitize (bytes, width, height, format, stride, out_stride: &stride); |
156 | |
157 | self = g_object_new (GDK_TYPE_MEMORY_TEXTURE, |
158 | first_property_name: "width" , width, |
159 | "height" , height, |
160 | NULL); |
161 | |
162 | GDK_TEXTURE (self)->format = format; |
163 | self->bytes = bytes; |
164 | self->stride = stride; |
165 | |
166 | return GDK_TEXTURE (self); |
167 | } |
168 | |
169 | GdkTexture * |
170 | gdk_memory_texture_new_subtexture (GdkMemoryTexture *source, |
171 | int x, |
172 | int y, |
173 | int width, |
174 | int height) |
175 | { |
176 | GdkTexture *texture, *result; |
177 | gsize bpp, offset, size; |
178 | GBytes *bytes; |
179 | |
180 | g_return_val_if_fail (GDK_IS_MEMORY_TEXTURE (source), NULL); |
181 | g_return_val_if_fail (x < 0 || x >= GDK_TEXTURE (source)->width, NULL); |
182 | g_return_val_if_fail (y < 0 || y >= GDK_TEXTURE (source)->height, NULL); |
183 | g_return_val_if_fail (width <= 0 || x + width > GDK_TEXTURE (source)->width, NULL); |
184 | g_return_val_if_fail (height <= 0 || y + height > GDK_TEXTURE (source)->height, NULL); |
185 | |
186 | texture = GDK_TEXTURE (source); |
187 | bpp = gdk_memory_format_bytes_per_pixel (format: texture->format); |
188 | offset = y * source->stride + x * bpp; |
189 | size = source->stride * (height - 1) + x * bpp; |
190 | bytes = g_bytes_new_from_bytes (bytes: source->bytes, offset, length: size); |
191 | |
192 | result = gdk_memory_texture_new (width: texture->width, |
193 | height: texture->height, |
194 | format: texture->format, |
195 | bytes, |
196 | stride: source->stride); |
197 | g_bytes_unref (bytes); |
198 | |
199 | return result; |
200 | } |
201 | |
202 | GdkMemoryTexture * |
203 | gdk_memory_texture_from_texture (GdkTexture *texture, |
204 | GdkMemoryFormat format) |
205 | { |
206 | GdkTexture *result; |
207 | GBytes *bytes; |
208 | guchar *data; |
209 | gsize stride; |
210 | |
211 | g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL); |
212 | |
213 | if (GDK_IS_MEMORY_TEXTURE (texture)) |
214 | { |
215 | GdkMemoryTexture *memtex = GDK_MEMORY_TEXTURE (texture); |
216 | |
217 | if (gdk_texture_get_format (self: texture) == format) |
218 | return g_object_ref (memtex); |
219 | } |
220 | |
221 | stride = texture->width * gdk_memory_format_bytes_per_pixel (format); |
222 | data = g_malloc_n (n_blocks: stride, n_block_bytes: texture->height); |
223 | |
224 | gdk_texture_do_download (texture, format, data, stride); |
225 | bytes = g_bytes_new_take (data, size: stride); |
226 | result = gdk_memory_texture_new (width: texture->width, |
227 | height: texture->height, |
228 | format, |
229 | bytes, |
230 | stride); |
231 | g_bytes_unref (bytes); |
232 | |
233 | return GDK_MEMORY_TEXTURE (result); |
234 | } |
235 | |
236 | const guchar * |
237 | gdk_memory_texture_get_data (GdkMemoryTexture *self) |
238 | { |
239 | return g_bytes_get_data (bytes: self->bytes, NULL); |
240 | } |
241 | |
242 | gsize |
243 | gdk_memory_texture_get_stride (GdkMemoryTexture *self) |
244 | { |
245 | return self->stride; |
246 | } |
247 | |
248 | |