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Diffstat (limited to 'src/FbTk/Transparent.cc')
-rw-r--r-- | src/FbTk/Transparent.cc | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/src/FbTk/Transparent.cc b/src/FbTk/Transparent.cc new file mode 100644 index 0000000..ed50e9e --- /dev/null +++ b/src/FbTk/Transparent.cc | |||
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1 | // Transparent.cc for FbTk - Fluxbox Toolkit | ||
2 | // Copyright (c) 2003 Henrik Kinnunen (fluxgen(at)users.sourceforge.net) | ||
3 | // | ||
4 | // Permission is hereby granted, free of charge, to any person obtaining a | ||
5 | // copy of this software and associated documentation files (the "Software"), | ||
6 | // to deal in the Software without restriction, including without limitation | ||
7 | // the rights to use, copy, modify, merge, publish, distribute, sublicense, | ||
8 | // and/or sell copies of the Software, and to permit persons to whom the | ||
9 | // Software is furnished to do so, subject to the following conditions: | ||
10 | // | ||
11 | // The above copyright notice and this permission notice shall be included in | ||
12 | // all copies or substantial portions of the Software. | ||
13 | // | ||
14 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
15 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
16 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | ||
17 | // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
18 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
19 | // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | ||
20 | // DEALINGS IN THE SOFTWARE. | ||
21 | |||
22 | // $Id: Transparent.cc,v 1.5 2003/05/13 20:50:56 fluxgen Exp $ | ||
23 | |||
24 | #include "Transparent.hh" | ||
25 | #include "App.hh" | ||
26 | |||
27 | #ifdef HAVE_CONFIG_H | ||
28 | #include "config.h" | ||
29 | #endif // HAVE_CONFIG_H | ||
30 | |||
31 | #ifdef HAVE_XRENDER | ||
32 | #include <X11/extensions/Xrender.h> | ||
33 | #endif // HAVE_XRENDER | ||
34 | |||
35 | #include <iostream> | ||
36 | using namespace std; | ||
37 | |||
38 | namespace { | ||
39 | #ifdef HAVE_XRENDER | ||
40 | Picture createAlphaPic(Window drawable, unsigned char alpha) { | ||
41 | Display *disp = FbTk::App::instance()->display(); | ||
42 | |||
43 | // try to find a specific render format | ||
44 | XRenderPictFormat pic_format; | ||
45 | pic_format.type = PictTypeDirect; | ||
46 | pic_format.depth = 8; // alpha with bit depth 8 | ||
47 | pic_format.direct.alphaMask = 0xff; | ||
48 | XRenderPictFormat *format = XRenderFindFormat(disp, PictFormatType | | ||
49 | PictFormatDepth | PictFormatAlphaMask, | ||
50 | &pic_format, 0); | ||
51 | if (format == 0) { | ||
52 | cerr<<"Warning! FbTk::Transparent: Failed to find valid format for alpha."<<endl; | ||
53 | return 0; | ||
54 | } | ||
55 | |||
56 | // create one pixel pixmap with depth 8 for alpha | ||
57 | Pixmap alpha_pm = XCreatePixmap(disp, drawable, | ||
58 | 1, 1, 8); | ||
59 | if (alpha_pm == 0) { | ||
60 | cerr<<"Warning! FbTk::Transparent: Failed to create alpha pixmap."<<endl; | ||
61 | return 0; | ||
62 | } | ||
63 | |||
64 | // create picture with alpha_pm as repeated background | ||
65 | XRenderPictureAttributes attr; | ||
66 | attr.repeat = True; // small bitmap repeated | ||
67 | Picture alpha_pic = XRenderCreatePicture(disp, alpha_pm, | ||
68 | format, CPRepeat, &attr); | ||
69 | if (alpha_pic == 0) { | ||
70 | XFreePixmap(disp, alpha_pm); | ||
71 | cerr<<"Warning! FbTk::Transparent: Failed to create alpha picture."<<endl; | ||
72 | return 0; | ||
73 | } | ||
74 | |||
75 | // finaly set alpha and fill with it | ||
76 | XRenderColor color; | ||
77 | // calculate alpha percent and then scale it to short | ||
78 | color.red = 0xFF; | ||
79 | color.blue = 0xFF; | ||
80 | color.green = 0xFF; | ||
81 | color.alpha = ((unsigned short) (255 * alpha) << 8); | ||
82 | if (alpha == 0) | ||
83 | color.alpha = 0xFF00; | ||
84 | |||
85 | XRenderFillRectangle(disp, PictOpSrc, alpha_pic, &color, | ||
86 | 0, 0, 1, 1); | ||
87 | |||
88 | XFreePixmap(disp, alpha_pm); | ||
89 | |||
90 | return alpha_pic; | ||
91 | } | ||
92 | #endif // HAVE_XRENDER | ||
93 | }; | ||
94 | |||
95 | namespace FbTk { | ||
96 | |||
97 | bool Transparent::s_init = false; | ||
98 | bool Transparent::s_render = false; | ||
99 | |||
100 | Transparent::Transparent(Drawable src, Drawable dest, unsigned char alpha, int screen_num): | ||
101 | m_alpha_pic(0), m_src_pic(0), m_dest_pic(0), | ||
102 | m_source(src), m_dest(dest), m_alpha(alpha) { | ||
103 | |||
104 | Display *disp = FbTk::App::instance()->display(); | ||
105 | |||
106 | // check for RENDER support | ||
107 | if (!s_init) { | ||
108 | int major_opcode, first_event, first_error; | ||
109 | if (XQueryExtension(disp, "RENDER", | ||
110 | &major_opcode, | ||
111 | &first_event, &first_error) == False) { | ||
112 | s_render = false; | ||
113 | } else { // we got RENDER support | ||
114 | s_render = true; | ||
115 | } | ||
116 | s_init = true; | ||
117 | } | ||
118 | |||
119 | |||
120 | #ifdef HAVE_XRENDER | ||
121 | if (!s_render) | ||
122 | return; | ||
123 | |||
124 | allocAlpha(m_alpha); | ||
125 | |||
126 | |||
127 | XRenderPictFormat *format = | ||
128 | XRenderFindVisualFormat(disp, | ||
129 | DefaultVisual(disp, screen_num)); | ||
130 | |||
131 | |||
132 | if (src != 0 && format != 0) { | ||
133 | m_src_pic = XRenderCreatePicture(disp, src, format, | ||
134 | 0, 0); | ||
135 | } | ||
136 | |||
137 | if (dest != 0 && format != 0) { | ||
138 | m_dest_pic = XRenderCreatePicture(disp, dest, format, | ||
139 | 0, 0); | ||
140 | } | ||
141 | #endif // HAVE_XRENDER | ||
142 | } | ||
143 | |||
144 | Transparent::~Transparent() { | ||
145 | #ifdef HAVE_XRENDER | ||
146 | if (m_alpha_pic != 0 && s_render) | ||
147 | freeAlpha(); | ||
148 | |||
149 | Display *disp = FbTk::App::instance()->display(); | ||
150 | |||
151 | if (m_dest_pic != 0 && s_render) | ||
152 | XRenderFreePicture(disp, m_dest_pic); | ||
153 | |||
154 | if (m_src_pic != 0 && s_render) | ||
155 | XRenderFreePicture(disp, m_src_pic); | ||
156 | #endif // HAVE_XRENDER | ||
157 | } | ||
158 | |||
159 | void Transparent::setAlpha(unsigned char alpha) { | ||
160 | if (m_source == 0 || !s_render) | ||
161 | return; | ||
162 | |||
163 | freeAlpha(); | ||
164 | allocAlpha(alpha); | ||
165 | } | ||
166 | |||
167 | void Transparent::setDest(Drawable dest, int screen_num) { | ||
168 | #ifdef HAVE_XRENDER | ||
169 | if (m_dest == dest || !s_render) | ||
170 | return; | ||
171 | |||
172 | Display *disp = FbTk::App::instance()->display(); | ||
173 | |||
174 | if (m_dest_pic != 0) { | ||
175 | XRenderFreePicture(disp, m_dest_pic); | ||
176 | m_dest_pic = 0; | ||
177 | } | ||
178 | // create new dest pic if we have a valid dest drawable | ||
179 | if (dest != 0) { | ||
180 | |||
181 | XRenderPictFormat *format = | ||
182 | XRenderFindVisualFormat(disp, | ||
183 | DefaultVisual(disp, screen_num)); | ||
184 | if (format == 0) | ||
185 | cerr<<"Warning! FbTk::Transparent: Failed to find format for screen("<<screen_num<<")"<<endl; | ||
186 | m_dest_pic = XRenderCreatePicture(disp, dest, format, 0, 0); | ||
187 | |||
188 | |||
189 | } | ||
190 | m_dest = dest; | ||
191 | #endif // HAVE_XRENDER | ||
192 | } | ||
193 | |||
194 | void Transparent::setSource(Drawable source, int screen_num) { | ||
195 | #ifdef HAVE_XRENDER | ||
196 | if (m_source == source || !s_render) | ||
197 | return; | ||
198 | // save old alpha value so we can recreate new later | ||
199 | // with the same value | ||
200 | unsigned char old_alpha = m_alpha; | ||
201 | if (m_alpha_pic != 0) | ||
202 | freeAlpha(); | ||
203 | |||
204 | Display *disp = FbTk::App::instance()->display(); | ||
205 | |||
206 | if (m_src_pic != 0) { | ||
207 | XRenderFreePicture(disp, m_src_pic); | ||
208 | m_src_pic = 0; | ||
209 | } | ||
210 | |||
211 | m_source = source; | ||
212 | |||
213 | // create new source pic if we have a valid source drawable | ||
214 | if (m_source != 0) { | ||
215 | |||
216 | XRenderPictFormat *format = | ||
217 | XRenderFindVisualFormat(disp, | ||
218 | DefaultVisual(disp, screen_num)); | ||
219 | if (format == 0) | ||
220 | cerr<<"Warning! FbTk::Transparent: Failed to find format for screen("<<screen_num<<")"<<endl; | ||
221 | m_src_pic = XRenderCreatePicture(disp, m_source, format, | ||
222 | 0, 0); | ||
223 | } | ||
224 | |||
225 | // recreate new alpha | ||
226 | allocAlpha(old_alpha); | ||
227 | |||
228 | #endif // HAVE_XRENDER | ||
229 | } | ||
230 | |||
231 | void Transparent::render(int src_x, int src_y, | ||
232 | int dest_x, int dest_y, | ||
233 | unsigned int width, unsigned int height) const { | ||
234 | #ifdef HAVE_XRENDER | ||
235 | if (m_src_pic == 0 || m_dest_pic == 0 || | ||
236 | m_alpha_pic == 0 || !s_render) | ||
237 | return; | ||
238 | // render src+alpha to dest picture | ||
239 | XRenderComposite(FbTk::App::instance()->display(), | ||
240 | PictOpOver, | ||
241 | m_src_pic, | ||
242 | m_alpha_pic, | ||
243 | m_dest_pic, | ||
244 | src_x, src_y, | ||
245 | 0, 0, | ||
246 | dest_x, dest_y, | ||
247 | width, height); | ||
248 | |||
249 | #endif // HAVE_XRENDER | ||
250 | } | ||
251 | |||
252 | void Transparent::allocAlpha(unsigned char alpha) { | ||
253 | #ifdef HAVE_XRENDER | ||
254 | if (m_source == 0 || !s_render) | ||
255 | return; | ||
256 | if (m_alpha_pic != 0) | ||
257 | freeAlpha(); | ||
258 | |||
259 | m_alpha_pic = createAlphaPic(m_source, alpha); | ||
260 | m_alpha = alpha; | ||
261 | #endif // HAVE_XRENDER | ||
262 | } | ||
263 | |||
264 | void Transparent::freeAlpha() { | ||
265 | #ifdef HAVE_XRENDER | ||
266 | if (s_render && m_alpha_pic != 0) | ||
267 | XRenderFreePicture(FbTk::App::instance()->display(), m_alpha_pic); | ||
268 | #endif // HAVE_XRENDER | ||
269 | m_alpha_pic = 0; | ||
270 | m_alpha = 255; | ||
271 | } | ||
272 | |||
273 | }; // end namespace FbTk | ||
274 | |||
275 | |||
276 | |||