shared/cairo-util.c

   1 /*
   2  * Copyright © 2008 Kristian Høgsberg
   3  * Copyright © 2012 Intel Corporation
   4  *
   5  * Permission to use, copy, modify, distribute, and sell this software and its
   6  * documentation for any purpose is hereby granted without fee, provided that
   7  * the above copyright notice appear in all copies and that both that copyright
   8  * notice and this permission notice appear in supporting documentation, and
   9  * that the name of the copyright holders not be used in advertising or
  10  * publicity pertaining to distribution of the software without specific,
  11  * written prior permission.  The copyright holders make no representations
  12  * about the suitability of this software for any purpose.  It is provided "as
  13  * is" without express or implied warranty.
  14  *
  15  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  16  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  17  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  18  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  19  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  20  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  21  * OF THIS SOFTWARE.
  22  */
  23
  24 #include "config.h"
  25
  26 #include <stdint.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <stdio.h>
  30 #include <math.h>
  31 #include <cairo.h>
  32 #include "cairo-util.h"
  33
  34 #include "image-loader.h"
  35 #include "config-parser.h"
  36
  37 #define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
  38
  39 void
  40 surface_flush_device(cairo_surface_t *surface)
  41 {
  42         cairo_device_t *device;
  43
  44         device = cairo_surface_get_device(surface);
  45         if (device)
  46                 cairo_device_flush(device);
  47 }
  48
  49 static int
  50 blur_surface(cairo_surface_t *surface, int margin)
  51 {
  52         int32_t width, height, stride, x, y, z, w;
  53         uint8_t *src, *dst;
  54         uint32_t *s, *d, a, p;
  55         int i, j, k, size, half;
  56         uint32_t kernel[71];
  57         double f;
  58
  59         size = ARRAY_LENGTH(kernel);
  60         width = cairo_image_surface_get_width(surface);
  61         height = cairo_image_surface_get_height(surface);
  62         stride = cairo_image_surface_get_stride(surface);
  63         src = cairo_image_surface_get_data(surface);
  64
  65         dst = malloc(height * stride);
  66         if (dst == NULL)
  67                 return -1;
  68
  69         half = size / 2;
  70         a = 0;
  71         for (i = 0; i < size; i++) {
  72                 f = (i - half);
  73                 kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
  74                 a += kernel[i];
  75         }
  76
  77         for (i = 0; i < height; i++) {
  78                 s = (uint32_t *) (src + i * stride);
  79                 d = (uint32_t *) (dst + i * stride);
  80                 for (j = 0; j < width; j++) {
  81                         if (margin < j && j < width - margin) {
  82                                 d[j] = s[j];
  83                                 continue;
  84                         }
  85
  86                         x = 0;
  87                         y = 0;
  88                         z = 0;
  89                         w = 0;
  90                         for (k = 0; k < size; k++) {
  91                                 if (j - half + k < 0 || j - half + k >= width)
  92                                         continue;
  93                                 p = s[j - half + k];
  94
  95                                 x += (p >> 24) * kernel[k];
  96                                 y += ((p >> 16) & 0xff) * kernel[k];
  97                                 z += ((p >> 8) & 0xff) * kernel[k];
  98                                 w += (p & 0xff) * kernel[k];
  99                         }
 100                         d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
 101                 }
 102         }
 103
 104         for (i = 0; i < height; i++) {
 105                 s = (uint32_t *) (dst + i * stride);
 106                 d = (uint32_t *) (src + i * stride);
 107                 for (j = 0; j < width; j++) {
 108                         if (margin <= i && i < height - margin) {
 109                                 d[j] = s[j];
 110                                 continue;
 111                         }
 112
 113                         x = 0;
 114                         y = 0;
 115                         z = 0;
 116                         w = 0;
 117                         for (k = 0; k < size; k++) {
 118                                 if (i - half + k < 0 || i - half + k >= height)
 119                                         continue;
 120                                 s = (uint32_t *) (dst + (i - half + k) * stride);
 121                                 p = s[j];
 122
 123                                 x += (p >> 24) * kernel[k];
 124                                 y += ((p >> 16) & 0xff) * kernel[k];
 125                                 z += ((p >> 8) & 0xff) * kernel[k];
 126                                 w += (p & 0xff) * kernel[k];
 127                         }
 128                         d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
 129                 }
 130         }
 131
 132         free(dst);
 133         cairo_surface_mark_dirty(surface);
 134
 135         return 0;
 136 }
 137
 138 void
 139 tile_mask(cairo_t *cr, cairo_surface_t *surface,
 140           int x, int y, int width, int height, int margin, int top_margin)
 141 {
 142         cairo_pattern_t *pattern;
 143         cairo_matrix_t matrix;
 144         int i, fx, fy, vmargin;
 145
 146         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 147         pattern = cairo_pattern_create_for_surface (surface);
 148         cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
 149
 150         for (i = 0; i < 4; i++) {
 151                 fx = i & 1;
 152                 fy = i >> 1;
 153
 154                 cairo_matrix_init_translate(&matrix,
 155                                             -x + fx * (128 - width),
 156                                             -y + fy * (128 - height));
 157                 cairo_pattern_set_matrix(pattern, &matrix);
 158
 159                 if (fy)
 160                         vmargin = margin;
 161                 else
 162                         vmargin = top_margin;
 163
 164                 cairo_reset_clip(cr);
 165                 cairo_rectangle(cr,
 166                                 x + fx * (width - margin),
 167                                 y + fy * (height - vmargin),
 168                                 margin, vmargin);
 169                 cairo_clip (cr);
 170                 cairo_mask(cr, pattern);
 171         }
 172
 173         /* Top stretch */
 174         cairo_matrix_init_translate(&matrix, 60, 0);
 175         cairo_matrix_scale(&matrix, 8.0 / width, 1);
 176         cairo_matrix_translate(&matrix, -x - width / 2, -y);
 177         cairo_pattern_set_matrix(pattern, &matrix);
 178         cairo_rectangle(cr, x + margin, y, width - 2 * margin, margin);
 179
 180         cairo_reset_clip(cr);
 181         cairo_rectangle(cr,
 182                         x + margin,
 183                         y,
 184                         width - 2 * margin, margin);
 185         cairo_clip (cr);
 186         cairo_mask(cr, pattern);
 187
 188         /* Bottom stretch */
 189         cairo_matrix_translate(&matrix, 0, -height + 128);
 190         cairo_pattern_set_matrix(pattern, &matrix);
 191
 192         cairo_reset_clip(cr);
 193         cairo_rectangle(cr, x + margin, y + height - margin,
 194                         width - 2 * margin, margin);
 195         cairo_clip (cr);
 196         cairo_mask(cr, pattern);
 197
 198         /* Left stretch */
 199         cairo_matrix_init_translate(&matrix, 0, 60);
 200         cairo_matrix_scale(&matrix, 1, 8.0 / height);
 201         cairo_matrix_translate(&matrix, -x, -y - height / 2);
 202         cairo_pattern_set_matrix(pattern, &matrix);
 203         cairo_reset_clip(cr);
 204         cairo_rectangle(cr, x, y + margin, margin, height - 2 * margin);
 205         cairo_clip (cr);
 206         cairo_mask(cr, pattern);
 207
 208         /* Right stretch */
 209         cairo_matrix_translate(&matrix, -width + 128, 0);
 210         cairo_pattern_set_matrix(pattern, &matrix);
 211         cairo_rectangle(cr, x + width - margin, y + margin,
 212                         margin, height - 2 * margin);
 213         cairo_reset_clip(cr);
 214         cairo_clip (cr);
 215         cairo_mask(cr, pattern);
 216
 217         cairo_pattern_destroy(pattern);
 218         cairo_reset_clip(cr);
 219 }
 220
 221 void
 222 tile_source(cairo_t *cr, cairo_surface_t *surface,
 223             int x, int y, int width, int height, int margin, int top_margin)
 224 {
 225         cairo_pattern_t *pattern;
 226         cairo_matrix_t matrix;
 227         int i, fx, fy, vmargin;
 228
 229         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 230         pattern = cairo_pattern_create_for_surface (surface);
 231         cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
 232         cairo_set_source(cr, pattern);
 233         cairo_pattern_destroy(pattern);
 234
 235         for (i = 0; i < 4; i++) {
 236                 fx = i & 1;
 237                 fy = i >> 1;
 238
 239                 cairo_matrix_init_translate(&matrix,
 240                                             -x + fx * (128 - width),
 241                                             -y + fy * (128 - height));
 242                 cairo_pattern_set_matrix(pattern, &matrix);
 243
 244                 if (fy)
 245                         vmargin = margin;
 246                 else
 247                         vmargin = top_margin;
 248
 249                 cairo_rectangle(cr,
 250                                 x + fx * (width - margin),
 251                                 y + fy * (height - vmargin),
 252                                 margin, vmargin);
 253                 cairo_fill(cr);
 254         }
 255
 256         /* Top stretch */
 257         cairo_matrix_init_translate(&matrix, 60, 0);
 258         cairo_matrix_scale(&matrix, 8.0 / (width - 2 * margin), 1);
 259         cairo_matrix_translate(&matrix, -x - width / 2, -y);
 260         cairo_pattern_set_matrix(pattern, &matrix);
 261         cairo_rectangle(cr, x + margin, y, width - 2 * margin, top_margin);
 262         cairo_fill(cr);
 263
 264         /* Bottom stretch */
 265         cairo_matrix_translate(&matrix, 0, -height + 128);
 266         cairo_pattern_set_matrix(pattern, &matrix);
 267         cairo_rectangle(cr, x + margin, y + height - margin,
 268                         width - 2 * margin, margin);
 269         cairo_fill(cr);
 270
 271         /* Left stretch */
 272         cairo_matrix_init_translate(&matrix, 0, 60);
 273         cairo_matrix_scale(&matrix, 1, 8.0 / (height - margin - top_margin));
 274         cairo_matrix_translate(&matrix, -x, -y - height / 2);
 275         cairo_pattern_set_matrix(pattern, &matrix);
 276         cairo_rectangle(cr, x, y + top_margin,
 277                         margin, height - margin - top_margin);
 278         cairo_fill(cr);
 279
 280         /* Right stretch */
 281         cairo_matrix_translate(&matrix, -width + 128, 0);
 282         cairo_pattern_set_matrix(pattern, &matrix);
 283         cairo_rectangle(cr, x + width - margin, y + top_margin,
 284                         margin, height - margin - top_margin);
 285         cairo_fill(cr);
 286 }
 287
 288 void
 289 rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
 290 {
 291         cairo_move_to(cr, x0, y0 + radius);
 292         cairo_arc(cr, x0 + radius, y0 + radius, radius, M_PI, 3 * M_PI / 2);
 293         cairo_line_to(cr, x1 - radius, y0);
 294         cairo_arc(cr, x1 - radius, y0 + radius, radius, 3 * M_PI / 2, 2 * M_PI);
 295         cairo_line_to(cr, x1, y1 - radius);
 296         cairo_arc(cr, x1 - radius, y1 - radius, radius, 0, M_PI / 2);
 297         cairo_line_to(cr, x0 + radius, y1);
 298         cairo_arc(cr, x0 + radius, y1 - radius, radius, M_PI / 2, M_PI);
 299         cairo_close_path(cr);
 300 }
 301
 302 cairo_surface_t *
 303 load_cairo_surface(const char *filename)
 304 {
 305         pixman_image_t *image;
 306         int width, height, stride;
 307         void *data;
 308
 309         image = load_image(filename);
 310         if (image == NULL) {
 311                 return NULL;
 312         }
 313
 314         data = pixman_image_get_data(image);
 315         width = pixman_image_get_width(image);
 316         height = pixman_image_get_height(image);
 317         stride = pixman_image_get_stride(image);
 318
 319         return cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32,
 320                                                    width, height, stride);
 321 }
 322
 323 void
 324 theme_set_background_source(struct theme *t, cairo_t *cr, uint32_t flags)
 325 {
 326         cairo_pattern_t *pattern;
 327
 328         if (flags & THEME_FRAME_ACTIVE) {
 329                 pattern = cairo_pattern_create_linear(16, 16, 16, 112);
 330                 cairo_pattern_add_color_stop_rgb(pattern, 0.0, 1.0, 1.0, 1.0);
 331                 cairo_pattern_add_color_stop_rgb(pattern, 0.2, 0.8, 0.8, 0.8);
 332                 cairo_set_source(cr, pattern);
 333                 cairo_pattern_destroy(pattern);
 334         } else {
 335                 cairo_set_source_rgba(cr, 0.75, 0.75, 0.75, 1);
 336         }
 337 }
 338
 339 struct theme *
 340 theme_create(void)
 341 {
 342         struct theme *t;
 343         cairo_t *cr;
 344
 345         t = malloc(sizeof *t);
 346         if (t == NULL)
 347                 return NULL;
 348
 349         t->margin = 32;
 350         t->width = 6;
 351         t->titlebar_height = 27;
 352         t->frame_radius = 3;
 353         t->shadow = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
 354         cr = cairo_create(t->shadow);
 355         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 356         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 357         rounded_rect(cr, 32, 32, 96, 96, t->frame_radius);
 358         cairo_fill(cr);
 359         if (cairo_status (cr) != CAIRO_STATUS_SUCCESS)
 360                 goto err_shadow;
 361         cairo_destroy(cr);
 362         if (blur_surface(t->shadow, 64) == -1)
 363                 goto err_shadow;
 364
 365         t->active_frame =
 366                 cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
 367         cr = cairo_create(t->active_frame);
 368         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 369
 370         theme_set_background_source(t, cr, THEME_FRAME_ACTIVE);
 371         rounded_rect(cr, 0, 0, 128, 128, t->frame_radius);
 372         cairo_fill(cr);
 373
 374         if (cairo_status(cr) != CAIRO_STATUS_SUCCESS)
 375                 goto err_active_frame;
 376
 377         cairo_destroy(cr);
 378
 379         t->inactive_frame =
 380                 cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
 381         cr = cairo_create(t->inactive_frame);
 382         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 383         theme_set_background_source(t, cr, 0);
 384         rounded_rect(cr, 0, 0, 128, 128, t->frame_radius);
 385         cairo_fill(cr);
 386
 387         if (cairo_status (cr) != CAIRO_STATUS_SUCCESS)
 388                 goto err_inactive_frame;
 389
 390         cairo_destroy(cr);
 391
 392         return t;
 393
 394  err_inactive_frame:
 395         cairo_surface_destroy(t->inactive_frame);
 396  err_active_frame:
 397         cairo_surface_destroy(t->active_frame);
 398  err_shadow:
 399         cairo_surface_destroy(t->shadow);
 400         free(t);
 401         return NULL;
 402 }
 403
 404 void
 405 theme_destroy(struct theme *t)
 406 {
 407         cairo_surface_destroy(t->active_frame);
 408         cairo_surface_destroy(t->inactive_frame);
 409         cairo_surface_destroy(t->shadow);
 410         free(t);
 411 }
 412
 413 void
 414 theme_render_frame(struct theme *t,
 415                    cairo_t *cr, int width, int height,
 416                    const char *title, uint32_t flags)
 417 {
 418         cairo_text_extents_t extents;
 419         cairo_font_extents_t font_extents;
 420         cairo_surface_t *source;
 421         int x, y, margin, top_margin;
 422
 423         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 424         cairo_set_source_rgba(cr, 0, 0, 0, 0);
 425         cairo_paint(cr);
 426
 427         if (flags & THEME_FRAME_MAXIMIZED)
 428                 margin = 0;
 429         else {
 430                 cairo_set_source_rgba(cr, 0, 0, 0, 0.45);
 431                 tile_mask(cr, t->shadow,
 432                           2, 2, width + 8, height + 8,
 433                           64, 64);
 434                 margin = t->margin;
 435         }
 436
 437         if (flags & THEME_FRAME_ACTIVE)
 438                 source = t->active_frame;
 439         else
 440                 source = t->inactive_frame;
 441
 442         if (title)
 443                 top_margin = t->titlebar_height;
 444         else
 445                 top_margin = t->width;
 446
 447         tile_source(cr, source,
 448                     margin, margin,
 449                     width - margin * 2, height - margin * 2,
 450                     t->width, top_margin);
 451
 452         if (title) {
 453                 cairo_rectangle (cr, margin + t->width, margin,
 454                                  width - (margin + t->width) * 2,
 455                                  t->titlebar_height - t->width);
 456                 cairo_clip(cr);
 457
 458                 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 459                 cairo_select_font_face(cr, "sans",
 460                                        CAIRO_FONT_SLANT_NORMAL,
 461                                        CAIRO_FONT_WEIGHT_BOLD);
 462                 cairo_set_font_size(cr, 14);
 463                 cairo_text_extents(cr, title, &extents);
 464                 cairo_font_extents (cr, &font_extents);
 465                 x = (width - extents.width) / 2;
 466                 y = margin +
 467                         (t->titlebar_height -
 468                          font_extents.ascent - font_extents.descent) / 2 +
 469                         font_extents.ascent;
 470
 471                 if (flags & THEME_FRAME_ACTIVE) {
 472                         cairo_move_to(cr, x + 1, y  + 1);
 473                         cairo_set_source_rgb(cr, 1, 1, 1);
 474                         cairo_show_text(cr, title);
 475                         cairo_move_to(cr, x, y);
 476                         cairo_set_source_rgb(cr, 0, 0, 0);
 477                         cairo_show_text(cr, title);
 478                 } else {
 479                         cairo_move_to(cr, x, y);
 480                         cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 481                         cairo_show_text(cr, title);
 482                 }
 483         }
 484 }
 485
 486 enum theme_location
 487 theme_get_location(struct theme *t, int x, int y,
 488                                 int width, int height, int flags)
 489 {
 490         int vlocation, hlocation, location;
 491         const int grip_size = 8;
 492         int margin, top_margin;
 493
 494         margin = (flags & THEME_FRAME_MAXIMIZED) ? 0 : t->margin;
 495
 496         if (flags & THEME_FRAME_NO_TITLE)
 497                 top_margin = t->width;
 498         else
 499                 top_margin = t->titlebar_height;
 500
 501         if (x < margin)
 502                 hlocation = THEME_LOCATION_EXTERIOR;
 503         else if (margin <= x && x < margin + grip_size)
 504                 hlocation = THEME_LOCATION_RESIZING_LEFT;
 505         else if (x < width - margin - grip_size)
 506                 hlocation = THEME_LOCATION_INTERIOR;
 507         else if (x < width - margin)
 508                 hlocation = THEME_LOCATION_RESIZING_RIGHT;
 509         else
 510                 hlocation = THEME_LOCATION_EXTERIOR;
 511
 512         if (y < margin)
 513                 vlocation = THEME_LOCATION_EXTERIOR;
 514         else if (margin <= y && y < margin + grip_size)
 515                 vlocation = THEME_LOCATION_RESIZING_TOP;
 516         else if (y < height - margin - grip_size)
 517                 vlocation = THEME_LOCATION_INTERIOR;
 518         else if (y < height - margin)
 519                 vlocation = THEME_LOCATION_RESIZING_BOTTOM;
 520         else
 521                 vlocation = THEME_LOCATION_EXTERIOR;
 522
 523         location = vlocation | hlocation;
 524         if (location & THEME_LOCATION_EXTERIOR)
 525                 location = THEME_LOCATION_EXTERIOR;
 526         if (location == THEME_LOCATION_INTERIOR &&
 527             y < margin + top_margin)
 528                 location = THEME_LOCATION_TITLEBAR;
 529         else if (location == THEME_LOCATION_INTERIOR)
 530                 location = THEME_LOCATION_CLIENT_AREA;
 531
 532         return location;
 533 }