don't compare variables to themselves
[mikachu/openbox.git] / render / render.c
1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
2
3    render.c for the Openbox window manager
4    Copyright (c) 2006        Mikael Magnusson
5    Copyright (c) 2003-2007   Dana Jansens
6    Copyright (c) 2003        Derek Foreman
7
8    This program is free software; you can redistribute it and/or modify
9    it under the terms of the GNU General Public License as published by
10    the Free Software Foundation; either version 2 of the License, or
11    (at your option) any later version.
12
13    This program is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17
18    See the COPYING file for a copy of the GNU General Public License.
19 */
20
21 #include "render.h"
22 #include "gradient.h"
23 #include "font.h"
24 #include "mask.h"
25 #include "color.h"
26 #include "image.h"
27 #include "theme.h"
28
29 #include <glib.h>
30 #include <X11/Xlib.h>
31 #include <X11/Xutil.h>
32 #include <X11/Xft/Xft.h>
33
34 #ifdef HAVE_STDLIB_H
35 #  include <stdlib.h>
36 #endif
37
38 static void pixel_data_to_pixmap(RrAppearance *l,
39                                  gint x, gint y, gint w, gint h);
40
41 Pixmap RrPaintPixmap(RrAppearance *a, gint w, gint h)
42 {
43     gint i, transferred = 0, sw, sh, partial_w, partial_h, force_transfer = 0;
44     RrPixel32 *source, *dest;
45     Pixmap oldp = None;
46     RrRect tarea; /* area in which to draw textures */
47     gboolean resized;
48
49     if (w <= 0 || h <= 0) return None;
50
51     if (a->surface.parentx < 0 || a->surface.parenty < 0) {
52         /* ob_debug("Invalid parent co-ordinates\n"); */
53         return None;
54     }
55
56     if (a->surface.grad == RR_SURFACE_PARENTREL &&
57         (a->surface.parentx >= a->surface.parent->w ||
58          a->surface.parenty >= a->surface.parent->h))
59     {
60         return None;
61     }
62
63     resized = (a->w != w || a->h != h);
64
65     oldp = a->pixmap; /* save to free after changing the visible pixmap */
66     a->pixmap = XCreatePixmap(RrDisplay(a->inst),
67                               RrRootWindow(a->inst),
68                               w, h, RrDepth(a->inst));
69
70     g_assert(a->pixmap != None);
71     a->w = w;
72     a->h = h;
73
74     if (a->xftdraw != NULL)
75         XftDrawDestroy(a->xftdraw);
76     a->xftdraw = XftDrawCreate(RrDisplay(a->inst), a->pixmap,
77                                RrVisual(a->inst), RrColormap(a->inst));
78     g_assert(a->xftdraw != NULL);
79
80     if (resized) {
81         g_free(a->surface.pixel_data);
82         a->surface.pixel_data = g_new(RrPixel32, w * h);
83     }
84
85     if (a->surface.grad == RR_SURFACE_PARENTREL) {
86         g_assert (a->surface.parent);
87         g_assert (a->surface.parent->w);
88
89         sw = a->surface.parent->w;
90         sh = a->surface.parent->h;
91
92         source = (a->surface.parent->surface.pixel_data +
93                   a->surface.parentx + sw * a->surface.parenty);
94         dest = a->surface.pixel_data;
95
96         if (a->surface.parentx + w > sw) {
97             partial_w = sw - a->surface.parentx;
98         } else partial_w = w;
99
100         if (a->surface.parenty + h > sh) {
101             partial_h = sh - a->surface.parenty;
102         } else partial_h = h;
103
104         for (i = 0; i < partial_h; i++, source += sw, dest += w) {
105             memcpy(dest, source, partial_w * sizeof(RrPixel32));
106         }
107     } else
108         RrRender(a, w, h);
109
110     {
111         gint l, t, r, b;
112         RrMargins(a, &l, &t, &r, &b);
113         RECT_SET(tarea, l, t, w - l - r, h - t - b); 
114     }       
115
116     for (i = 0; i < a->textures; i++) {
117         switch (a->texture[i].type) {
118         case RR_TEXTURE_NONE:
119             break;
120         case RR_TEXTURE_TEXT:
121             if (!transferred) {
122                 transferred = 1;
123                 if ((a->surface.grad != RR_SURFACE_SOLID)
124                     || (a->surface.interlaced))
125                     pixel_data_to_pixmap(a, 0, 0, w, h);
126             }
127             if (a->xftdraw == NULL) {
128                 a->xftdraw = XftDrawCreate(RrDisplay(a->inst), a->pixmap, 
129                                            RrVisual(a->inst),
130                                            RrColormap(a->inst));
131             }
132             RrFontDraw(a->xftdraw, &a->texture[i].data.text, &tarea);
133             break;
134         case RR_TEXTURE_LINE_ART:
135             if (!transferred) {
136                 transferred = 1;
137                 if ((a->surface.grad != RR_SURFACE_SOLID)
138                     || (a->surface.interlaced))
139                     pixel_data_to_pixmap(a, 0, 0, w, h);
140             }
141             XDrawLine(RrDisplay(a->inst), a->pixmap,
142                       RrColorGC(a->texture[i].data.lineart.color),
143                       a->texture[i].data.lineart.x1,
144                       a->texture[i].data.lineart.y1,
145                       a->texture[i].data.lineart.x2,
146                       a->texture[i].data.lineart.y2);
147             break;
148         case RR_TEXTURE_MASK:
149             if (!transferred) {
150                 transferred = 1;
151                 if ((a->surface.grad != RR_SURFACE_SOLID)
152                     || (a->surface.interlaced))
153                     pixel_data_to_pixmap(a, 0, 0, w, h);
154             }
155             RrPixmapMaskDraw(a->pixmap, &a->texture[i].data.mask, &tarea);
156             break;
157         case RR_TEXTURE_RGBA:
158             g_assert(!transferred);
159             RrImageDraw(a->surface.pixel_data,
160                         &a->texture[i].data.rgba,
161                         a->w, a->h,
162                         &tarea);
163             force_transfer = 1;
164         break;
165         }
166     }
167
168     if (!transferred) {
169         transferred = 1;
170         if ((a->surface.grad != RR_SURFACE_SOLID) || (a->surface.interlaced) ||
171             force_transfer)
172         {
173             pixel_data_to_pixmap(a, 0, 0, w, h);
174         }
175     }
176
177     return oldp;
178 }
179
180 void RrPaint(RrAppearance *a, Window win, gint w, gint h)
181 {
182     Pixmap oldp;
183
184     oldp = RrPaintPixmap(a, w, h);
185     XSetWindowBackgroundPixmap(RrDisplay(a->inst), win, a->pixmap);
186     XClearWindow(RrDisplay(a->inst), win);
187     /* free this after changing the visible pixmap */
188     if (oldp) XFreePixmap(RrDisplay(a->inst), oldp);
189 }
190
191 RrAppearance *RrAppearanceNew(const RrInstance *inst, gint numtex)
192 {
193   RrAppearance *out;
194
195   out = g_new0(RrAppearance, 1);
196   out->inst = inst;
197   out->textures = numtex;
198   if (numtex) out->texture = g_new0(RrTexture, numtex);
199
200   return out;
201 }
202
203 void RrAppearanceAddTextures(RrAppearance *a, gint numtex)
204 {
205     g_assert(a->textures == 0);
206
207     a->textures = numtex;
208     if (numtex) a->texture = g_new0(RrTexture, numtex);
209 }
210
211 RrAppearance *RrAppearanceCopy(RrAppearance *orig)
212 {
213     RrSurface *spo, *spc;
214     RrAppearance *copy = g_new(RrAppearance, 1);
215     gint i;
216
217     copy->inst = orig->inst;
218
219     spo = &(orig->surface);
220     spc = &(copy->surface);
221     spc->grad = spo->grad;
222     spc->relief = spo->relief;
223     spc->bevel = spo->bevel;
224     if (spo->primary != NULL)
225         spc->primary = RrColorNew(copy->inst,
226                                   spo->primary->r,
227                                   spo->primary->g, 
228                                   spo->primary->b);
229     else spc->primary = NULL;
230
231     if (spo->secondary != NULL)
232         spc->secondary = RrColorNew(copy->inst,
233                                     spo->secondary->r,
234                                     spo->secondary->g,
235                                     spo->secondary->b);
236     else spc->secondary = NULL;
237
238     if (spo->border_color != NULL)
239         spc->border_color = RrColorNew(copy->inst,
240                                        spo->border_color->r,
241                                        spo->border_color->g,
242                                        spo->border_color->b);
243     else spc->border_color = NULL;
244
245     if (spo->interlace_color != NULL)
246         spc->interlace_color = RrColorNew(copy->inst,
247                                        spo->interlace_color->r,
248                                        spo->interlace_color->g,
249                                        spo->interlace_color->b);
250     else spc->interlace_color = NULL;
251
252     if (spo->bevel_dark != NULL)
253         spc->bevel_dark = RrColorNew(copy->inst,
254                                      spo->bevel_dark->r,
255                                      spo->bevel_dark->g,
256                                      spo->bevel_dark->b);
257     else spc->bevel_dark = NULL;
258
259     if (spo->bevel_light != NULL)
260         spc->bevel_light = RrColorNew(copy->inst,
261                                       spo->bevel_light->r,
262                                       spo->bevel_light->g,
263                                       spo->bevel_light->b);
264     else spc->bevel_light = NULL;
265
266     spc->interlaced = spo->interlaced;
267     spc->border = spo->border;
268     spc->parent = NULL;
269     spc->parentx = spc->parenty = 0;
270     spc->pixel_data = NULL;
271
272     copy->textures = orig->textures;
273     copy->texture = g_memdup(orig->texture,
274                              orig->textures * sizeof(RrTexture));
275     for (i = 0; i < copy->textures; ++i)
276         if (copy->texture[i].type == RR_TEXTURE_RGBA) {
277             copy->texture[i].data.rgba.cache = NULL;
278         }
279     copy->pixmap = None;
280     copy->xftdraw = NULL;
281     copy->w = copy->h = 0;
282     return copy;
283 }
284
285 void RrAppearanceFree(RrAppearance *a)
286 {
287     gint i;
288
289     if (a) {
290         RrSurface *p;
291         if (a->pixmap != None) XFreePixmap(RrDisplay(a->inst), a->pixmap);
292         if (a->xftdraw != NULL) XftDrawDestroy(a->xftdraw);
293         for (i = 0; i < a->textures; ++i)
294             if (a->texture[i].type == RR_TEXTURE_RGBA) {
295                 g_free(a->texture[i].data.rgba.cache);
296                 a->texture[i].data.rgba.cache = NULL;
297             }
298         if (a->textures)
299             g_free(a->texture);
300         p = &a->surface;
301         RrColorFree(p->primary);
302         RrColorFree(p->secondary);
303         RrColorFree(p->border_color);
304         RrColorFree(p->interlace_color);
305         RrColorFree(p->bevel_dark);
306         RrColorFree(p->bevel_light);
307         g_free(p->pixel_data);
308         p->pixel_data = NULL;
309         g_free(a);
310     }
311 }
312
313
314 static void pixel_data_to_pixmap(RrAppearance *l,
315                                  gint x, gint y, gint w, gint h)
316 {
317     RrPixel32 *in, *scratch;
318     Pixmap out;
319     XImage *im = NULL;
320     im = XCreateImage(RrDisplay(l->inst), RrVisual(l->inst), RrDepth(l->inst),
321                       ZPixmap, 0, NULL, w, h, 32, 0);
322     g_assert(im != NULL);
323
324     in = l->surface.pixel_data;
325     out = l->pixmap;
326
327 /* this malloc is a complete waste of time on normal 32bpp
328    as reduce_depth just sets im->data = data and returns
329 */
330     scratch = g_new(RrPixel32, im->width * im->height);
331     im->data = (gchar*) scratch;
332     RrReduceDepth(l->inst, in, im);
333     XPutImage(RrDisplay(l->inst), out,
334               DefaultGC(RrDisplay(l->inst), RrScreen(l->inst)),
335               im, 0, 0, x, y, w, h);
336     im->data = NULL;
337     XDestroyImage(im);
338     g_free(scratch);
339 }
340
341 void RrMargins (RrAppearance *a, gint *l, gint *t, gint *r, gint *b)
342 {
343     *l = *t = *r = *b = 0;
344
345     if (a->surface.grad != RR_SURFACE_PARENTREL) {
346         if (a->surface.relief != RR_RELIEF_FLAT) {
347             switch (a->surface.bevel) {
348             case RR_BEVEL_1:
349                 *l = *t = *r = *b = 1;
350                 break;
351             case RR_BEVEL_2:
352                 *l = *t = *r = *b = 2;
353                 break;
354             }
355         } else if (a->surface.border) {
356             *l = *t = *r = *b = 1;
357         }
358     }
359 }
360
361 void RrMinSize(RrAppearance *a, gint *w, gint *h)
362 {
363     *w = RrMinWidth(a);
364     *h = RrMinHeight(a);
365 }
366
367 gint RrMinWidth(RrAppearance *a)
368 {
369     gint i;
370     RrSize *m;
371     gint l, t, r, b;
372     gint w = 0;
373
374     for (i = 0; i < a->textures; ++i) {
375         switch (a->texture[i].type) {
376         case RR_TEXTURE_NONE:
377             break;
378         case RR_TEXTURE_MASK:
379             w = MAX(w, a->texture[i].data.mask.mask->width);
380             break;
381         case RR_TEXTURE_TEXT:
382             m = RrFontMeasureString(a->texture[i].data.text.font,
383                                     a->texture[i].data.text.string, 
384                                     a->texture[i].data.text.shadow_offset_x,
385                                     a->texture[i].data.text.shadow_offset_y);
386             w = MAX(w, m->width);
387             g_free(m);
388             break;
389         case RR_TEXTURE_RGBA:
390             w += MAX(w, a->texture[i].data.rgba.width);
391             break;
392         case RR_TEXTURE_LINE_ART:
393             w += MAX(w, MAX(a->texture[i].data.lineart.x1,
394                             a->texture[i].data.lineart.x2));
395             break;
396         }
397     }
398
399     RrMargins(a, &l, &t, &r, &b);
400
401     w += l + r;
402
403     if (w < 1) w = 1;
404     return w;
405 }
406
407 gint RrMinHeight(RrAppearance *a)
408 {
409     gint i;
410     gint l, t, r, b;
411     gint h = 0;
412
413     for (i = 0; i < a->textures; ++i) {
414         switch (a->texture[i].type) {
415         case RR_TEXTURE_NONE:
416             break;
417         case RR_TEXTURE_MASK:
418             h = MAX(h, a->texture[i].data.mask.mask->height);
419             break;
420         case RR_TEXTURE_TEXT:
421             h += MAX(h, RrFontHeight(a->texture[i].data.text.font,
422                                      a->texture[i].data.text.shadow_offset_y));
423             break;
424         case RR_TEXTURE_RGBA:
425             h += MAX(h, a->texture[i].data.rgba.height);
426             break;
427         case RR_TEXTURE_LINE_ART:
428             h += MAX(h, MAX(a->texture[i].data.lineart.y1,
429                             a->texture[i].data.lineart.y2));
430             break;
431         }
432     }
433
434     RrMargins(a, &l, &t, &r, &b);
435
436     h += t + b;
437
438     if (h < 1) h = 1;
439     return h;
440 }
441
442 static void reverse_bits(gchar *c, gint n)
443 {
444     gint i;
445     for (i = 0; i < n; i++, c++)
446         *c = (((*c * 0x0802UL & 0x22110UL) |
447                (*c * 0x8020UL & 0x88440UL)) * 0x10101UL) >> 16;
448 }
449
450 gboolean RrPixmapToRGBA(const RrInstance *inst,
451                         Pixmap pmap, Pixmap mask,
452                         gint *w, gint *h, RrPixel32 **data)
453 {
454     Window xr;
455     gint xx, xy;
456     guint pw, ph, mw, mh, xb, xd, i, x, y, di;
457     XImage *xi, *xm = NULL;
458
459     if (!XGetGeometry(RrDisplay(inst), pmap,
460                       &xr, &xx, &xy, &pw, &ph, &xb, &xd))
461         return FALSE;
462
463     if (mask) {
464         if (!XGetGeometry(RrDisplay(inst), mask,
465                           &xr, &xx, &xy, &mw, &mh, &xb, &xd))
466             return FALSE;
467         if (pw != mw || ph != mh || xd != 1)
468             return FALSE;
469     }
470
471     xi = XGetImage(RrDisplay(inst), pmap,
472                    0, 0, pw, ph, 0xffffffff, ZPixmap);
473     if (!xi)
474         return FALSE;
475
476     if (mask) {
477         xm = XGetImage(RrDisplay(inst), mask,
478                        0, 0, mw, mh, 0xffffffff, ZPixmap);
479         if (!xm) {
480             XDestroyImage(xi);
481             return FALSE;
482         }
483         if ((xm->bits_per_pixel == 1) && (xm->bitmap_bit_order != LSBFirst))
484             reverse_bits(xm->data, xm->bytes_per_line * xm->height);
485     }
486
487     if ((xi->bits_per_pixel == 1) && (xi->bitmap_bit_order != LSBFirst))
488         reverse_bits(xi->data, xi->bytes_per_line * xi->height);
489
490     *data = g_new(RrPixel32, pw * ph);
491     RrIncreaseDepth(inst, *data, xi);
492
493     if (mask) {
494         /* apply transparency from the mask */
495         di = 0;
496         for (i = 0, y = 0; y < ph; ++y) {
497             for (x = 0; x < pw; ++x, ++i) {
498                 if (!((((unsigned)xm->data[di + x / 8]) >> (x % 8)) & 0x1))
499                     (*data)[i] &= ~(0xff << RrDefaultAlphaOffset);
500             }
501             di += xm->bytes_per_line;
502         }
503     }
504
505     *w = pw;
506     *h = ph;
507
508     XDestroyImage(xi);
509     if (mask)
510         XDestroyImage(xm);
511
512     return TRUE;
513 }