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 void
  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
  67         half = size / 2;
  68         a = 0;
  69         for (i = 0; i < size; i++) {
  70                 f = (i - half);
  71                 kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
  72                 a += kernel[i];
  73         }
  74
  75         for (i = 0; i < height; i++) {
  76                 s = (uint32_t *) (src + i * stride);
  77                 d = (uint32_t *) (dst + i * stride);
  78                 for (j = 0; j < width; j++) {
  79                         if (margin < j && j < width - margin) {
  80                                 d[j] = s[j];
  81                                 continue;
  82                         }
  83
  84                         x = 0;
  85                         y = 0;
  86                         z = 0;
  87                         w = 0;
  88                         for (k = 0; k < size; k++) {
  89                                 if (j - half + k < 0 || j - half + k >= width)
  90                                         continue;
  91                                 p = s[j - half + k];
  92
  93                                 x += (p >> 24) * kernel[k];
  94                                 y += ((p >> 16) & 0xff) * kernel[k];
  95                                 z += ((p >> 8) & 0xff) * kernel[k];
  96                                 w += (p & 0xff) * kernel[k];
  97                         }
  98                         d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
  99                 }
 100         }
 101
 102         for (i = 0; i < height; i++) {
 103                 s = (uint32_t *) (dst + i * stride);
 104                 d = (uint32_t *) (src + i * stride);
 105                 for (j = 0; j < width; j++) {
 106                         if (margin <= i && i < height - margin) {
 107                                 d[j] = s[j];
 108                                 continue;
 109                         }
 110
 111                         x = 0;
 112                         y = 0;
 113                         z = 0;
 114                         w = 0;
 115                         for (k = 0; k < size; k++) {
 116                                 if (i - half + k < 0 || i - half + k >= height)
 117                                         continue;
 118                                 s = (uint32_t *) (dst + (i - half + k) * stride);
 119                                 p = s[j];
 120
 121                                 x += (p >> 24) * kernel[k];
 122                                 y += ((p >> 16) & 0xff) * kernel[k];
 123                                 z += ((p >> 8) & 0xff) * kernel[k];
 124                                 w += (p & 0xff) * kernel[k];
 125                         }
 126                         d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
 127                 }
 128         }
 129
 130         free(dst);
 131         cairo_surface_mark_dirty(surface);
 132 }
 133
 134 void
 135 tile_mask(cairo_t *cr, cairo_surface_t *surface,
 136           int x, int y, int width, int height, int margin, int top_margin)
 137 {
 138         cairo_pattern_t *pattern;
 139         cairo_matrix_t matrix;
 140         int i, fx, fy, vmargin;
 141
 142         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 143         pattern = cairo_pattern_create_for_surface (surface);
 144         cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
 145
 146         for (i = 0; i < 4; i++) {
 147                 fx = i & 1;
 148                 fy = i >> 1;
 149
 150                 cairo_matrix_init_translate(&matrix,
 151                                             -x + fx * (128 - width),
 152                                             -y + fy * (128 - height));
 153                 cairo_pattern_set_matrix(pattern, &matrix);
 154
 155                 if (fy)
 156                         vmargin = margin;
 157                 else
 158                         vmargin = top_margin;
 159
 160                 cairo_reset_clip(cr);
 161                 cairo_rectangle(cr,
 162                                 x + fx * (width - margin),
 163                                 y + fy * (height - vmargin),
 164                                 margin, vmargin);
 165                 cairo_clip (cr);
 166                 cairo_mask(cr, pattern);
 167         }
 168
 169         /* Top stretch */
 170         cairo_matrix_init_translate(&matrix, 60, 0);
 171         cairo_matrix_scale(&matrix, 8.0 / width, 1);
 172         cairo_matrix_translate(&matrix, -x - width / 2, -y);
 173         cairo_pattern_set_matrix(pattern, &matrix);
 174         cairo_rectangle(cr, x + margin, y, width - 2 * margin, margin);
 175
 176         cairo_reset_clip(cr);
 177         cairo_rectangle(cr,
 178                         x + margin,
 179                         y,
 180                         width - 2 * margin, margin);
 181         cairo_clip (cr);
 182         cairo_mask(cr, pattern);
 183
 184         /* Bottom stretch */
 185         cairo_matrix_translate(&matrix, 0, -height + 128);
 186         cairo_pattern_set_matrix(pattern, &matrix);
 187
 188         cairo_reset_clip(cr);
 189         cairo_rectangle(cr, x + margin, y + height - margin,
 190                         width - 2 * margin, margin);
 191         cairo_clip (cr);
 192         cairo_mask(cr, pattern);
 193
 194         /* Left stretch */
 195         cairo_matrix_init_translate(&matrix, 0, 60);
 196         cairo_matrix_scale(&matrix, 1, 8.0 / height);
 197         cairo_matrix_translate(&matrix, -x, -y - height / 2);
 198         cairo_pattern_set_matrix(pattern, &matrix);
 199         cairo_reset_clip(cr);
 200         cairo_rectangle(cr, x, y + margin, margin, height - 2 * margin);
 201         cairo_clip (cr);
 202         cairo_mask(cr, pattern);
 203
 204         /* Right stretch */
 205         cairo_matrix_translate(&matrix, -width + 128, 0);
 206         cairo_pattern_set_matrix(pattern, &matrix);
 207         cairo_rectangle(cr, x + width - margin, y + margin,
 208                         margin, height - 2 * margin);
 209         cairo_reset_clip(cr);
 210         cairo_clip (cr);
 211         cairo_mask(cr, pattern);
 212
 213         cairo_pattern_destroy(pattern);
 214         cairo_reset_clip(cr);
 215 }
 216
 217 void
 218 tile_source(cairo_t *cr, cairo_surface_t *surface,
 219             int x, int y, int width, int height, int margin, int top_margin)
 220 {
 221         cairo_pattern_t *pattern;
 222         cairo_matrix_t matrix;
 223         int i, fx, fy, vmargin;
 224
 225         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 226         pattern = cairo_pattern_create_for_surface (surface);
 227         cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
 228         cairo_set_source(cr, pattern);
 229         cairo_pattern_destroy(pattern);
 230
 231         for (i = 0; i < 4; i++) {
 232                 fx = i & 1;
 233                 fy = i >> 1;
 234
 235                 cairo_matrix_init_translate(&matrix,
 236                                             -x + fx * (128 - width),
 237                                             -y + fy * (128 - height));
 238                 cairo_pattern_set_matrix(pattern, &matrix);
 239
 240                 if (fy)
 241                         vmargin = margin;
 242                 else
 243                         vmargin = top_margin;
 244
 245                 cairo_rectangle(cr,
 246                                 x + fx * (width - margin),
 247                                 y + fy * (height - vmargin),
 248                                 margin, vmargin);
 249                 cairo_fill(cr);
 250         }
 251
 252         /* Top stretch */
 253         cairo_matrix_init_translate(&matrix, 60, 0);
 254         cairo_matrix_scale(&matrix, 8.0 / (width - 2 * margin), 1);
 255         cairo_matrix_translate(&matrix, -x - width / 2, -y);
 256         cairo_pattern_set_matrix(pattern, &matrix);
 257         cairo_rectangle(cr, x + margin, y, width - 2 * margin, top_margin);
 258         cairo_fill(cr);
 259
 260         /* Bottom stretch */
 261         cairo_matrix_translate(&matrix, 0, -height + 128);
 262         cairo_pattern_set_matrix(pattern, &matrix);
 263         cairo_rectangle(cr, x + margin, y + height - margin,
 264                         width - 2 * margin, margin);
 265         cairo_fill(cr);
 266
 267         /* Left stretch */
 268         cairo_matrix_init_translate(&matrix, 0, 60);
 269         cairo_matrix_scale(&matrix, 1, 8.0 / (height - margin - top_margin));
 270         cairo_matrix_translate(&matrix, -x, -y - height / 2);
 271         cairo_pattern_set_matrix(pattern, &matrix);
 272         cairo_rectangle(cr, x, y + top_margin,
 273                         margin, height - margin - top_margin);
 274         cairo_fill(cr);
 275
 276         /* Right stretch */
 277         cairo_matrix_translate(&matrix, -width + 128, 0);
 278         cairo_pattern_set_matrix(pattern, &matrix);
 279         cairo_rectangle(cr, x + width - margin, y + top_margin,
 280                         margin, height - margin - top_margin);
 281         cairo_fill(cr);
 282 }
 283
 284 void
 285 rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
 286 {
 287         cairo_move_to(cr, x0, y0 + radius);
 288         cairo_arc(cr, x0 + radius, y0 + radius, radius, M_PI, 3 * M_PI / 2);
 289         cairo_line_to(cr, x1 - radius, y0);
 290         cairo_arc(cr, x1 - radius, y0 + radius, radius, 3 * M_PI / 2, 2 * M_PI);
 291         cairo_line_to(cr, x1, y1 - radius);
 292         cairo_arc(cr, x1 - radius, y1 - radius, radius, 0, M_PI / 2);
 293         cairo_line_to(cr, x0 + radius, y1);
 294         cairo_arc(cr, x0 + radius, y1 - radius, radius, M_PI / 2, M_PI);
 295         cairo_close_path(cr);
 296 }
 297
 298 cairo_surface_t *
 299 load_cairo_surface(const char *filename)
 300 {
 301         pixman_image_t *image;
 302         int width, height, stride;
 303         void *data;
 304
 305         image = load_image(filename);
 306         if (image == NULL) {
 307                 return NULL;
 308         }
 309
 310         data = pixman_image_get_data(image);
 311         width = pixman_image_get_width(image);
 312         height = pixman_image_get_height(image);
 313         stride = pixman_image_get_stride(image);
 314
 315         return cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32,
 316                                                    width, height, stride);
 317 }
 318
 319 struct theme *
 320 theme_create(void)
 321 {
 322         struct theme *t;
 323         cairo_t *cr;
 324         cairo_pattern_t *pattern;
 325
 326         t = malloc(sizeof *t);
 327         t->margin = 32;
 328         t->width = 6;
 329         t->titlebar_height = 27;
 330         t->frame_radius = 3;
 331         t->shadow = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
 332         cr = cairo_create(t->shadow);
 333         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 334         cairo_set_source_rgba(cr, 0, 0, 0, 1);
 335         rounded_rect(cr, 32, 32, 96, 96, t->frame_radius);
 336         cairo_fill(cr);
 337         cairo_destroy(cr);
 338         blur_surface(t->shadow, 64);
 339
 340         t->active_frame =
 341                 cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
 342         cr = cairo_create(t->active_frame);
 343         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 344
 345         pattern = cairo_pattern_create_linear(16, 16, 16, 112);
 346         cairo_pattern_add_color_stop_rgb(pattern, 0.0, 1.0, 1.0, 1.0);
 347         cairo_pattern_add_color_stop_rgb(pattern, 0.2, 0.8, 0.8, 0.8);
 348         cairo_set_source(cr, pattern);
 349         cairo_pattern_destroy(pattern);
 350
 351         rounded_rect(cr, 0, 0, 128, 128, t->frame_radius);
 352         cairo_fill(cr);
 353         cairo_destroy(cr);
 354
 355         t->inactive_frame =
 356                 cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
 357         cr = cairo_create(t->inactive_frame);
 358         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 359         cairo_set_source_rgba(cr, 0.75, 0.75, 0.75, 1);
 360         rounded_rect(cr, 0, 0, 128, 128, t->frame_radius);
 361         cairo_fill(cr);
 362         cairo_destroy(cr);
 363
 364         return t;
 365 }
 366
 367 void
 368 theme_destroy(struct theme *t)
 369 {
 370         cairo_surface_destroy(t->active_frame);
 371         cairo_surface_destroy(t->inactive_frame);
 372         cairo_surface_destroy(t->shadow);
 373         free(t);
 374 }
 375
 376 void
 377 theme_render_frame(struct theme *t,
 378                    cairo_t *cr, int width, int height,
 379                    const char *title, uint32_t flags)
 380 {
 381         cairo_text_extents_t extents;
 382         cairo_font_extents_t font_extents;
 383         cairo_surface_t *source;
 384         int x, y, margin;
 385
 386         cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
 387         cairo_set_source_rgba(cr, 0, 0, 0, 0);
 388         cairo_paint(cr);
 389
 390         if (flags & THEME_FRAME_MAXIMIZED)
 391                 margin = 0;
 392         else {
 393                 cairo_set_source_rgba(cr, 0, 0, 0, 0.45);
 394                 tile_mask(cr, t->shadow,
 395                           2, 2, width + 8, height + 8,
 396                           64, 64);
 397                 margin = t->margin;
 398         }
 399
 400         if (flags & THEME_FRAME_ACTIVE)
 401                 source = t->active_frame;
 402         else
 403                 source = t->inactive_frame;
 404
 405         tile_source(cr, source,
 406                     margin, margin,
 407                     width - margin * 2, height - margin * 2,
 408                     t->width, t->titlebar_height);
 409
 410         cairo_rectangle (cr, margin + t->width, margin,
 411                          width - (margin + t->width) * 2,
 412                          t->titlebar_height - t->width);
 413         cairo_clip(cr);
 414
 415         cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
 416         cairo_select_font_face(cr, "sans",
 417                                CAIRO_FONT_SLANT_NORMAL,
 418                                CAIRO_FONT_WEIGHT_BOLD);
 419         cairo_set_font_size(cr, 14);
 420         cairo_text_extents(cr, title, &extents);
 421         cairo_font_extents (cr, &font_extents);
 422         x = (width - extents.width) / 2;
 423         y = margin +
 424                 (t->titlebar_height -
 425                  font_extents.ascent - font_extents.descent) / 2 +
 426                 font_extents.ascent;
 427
 428         if (flags & THEME_FRAME_ACTIVE) {
 429                 cairo_move_to(cr, x + 1, y  + 1);
 430                 cairo_set_source_rgb(cr, 1, 1, 1);
 431                 cairo_show_text(cr, title);
 432                 cairo_move_to(cr, x, y);
 433                 cairo_set_source_rgb(cr, 0, 0, 0);
 434                 cairo_show_text(cr, title);
 435         } else {
 436                 cairo_move_to(cr, x, y);
 437                 cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
 438                 cairo_show_text(cr, title);
 439         }
 440 }
 441
 442 enum theme_location
 443 theme_get_location(struct theme *t, int x, int y,
 444                                 int width, int height, int flags)
 445 {
 446         int vlocation, hlocation, location;
 447         const int grip_size = 8;
 448         int margin;
 449
 450         margin = (flags & THEME_FRAME_MAXIMIZED) ? 0 : t->margin;
 451
 452         if (x < margin)
 453                 hlocation = THEME_LOCATION_EXTERIOR;
 454         else if (margin <= x && x < margin + grip_size)
 455                 hlocation = THEME_LOCATION_RESIZING_LEFT;
 456         else if (x < width - margin - grip_size)
 457                 hlocation = THEME_LOCATION_INTERIOR;
 458         else if (x < width - margin)
 459                 hlocation = THEME_LOCATION_RESIZING_RIGHT;
 460         else
 461                 hlocation = THEME_LOCATION_EXTERIOR;
 462
 463         if (y < margin)
 464                 vlocation = THEME_LOCATION_EXTERIOR;
 465         else if (margin <= y && y < margin + grip_size)
 466                 vlocation = THEME_LOCATION_RESIZING_TOP;
 467         else if (y < height - margin - grip_size)
 468                 vlocation = THEME_LOCATION_INTERIOR;
 469         else if (y < height - margin)
 470                 vlocation = THEME_LOCATION_RESIZING_BOTTOM;
 471         else
 472                 vlocation = THEME_LOCATION_EXTERIOR;
 473
 474         location = vlocation | hlocation;
 475         if (location & THEME_LOCATION_EXTERIOR)
 476                 location = THEME_LOCATION_EXTERIOR;
 477         if (location == THEME_LOCATION_INTERIOR &&
 478             y < margin + t->titlebar_height)
 479                 location = THEME_LOCATION_TITLEBAR;
 480         else if (location == THEME_LOCATION_INTERIOR)
 481                 location = THEME_LOCATION_CLIENT_AREA;
 482
 483         return location;
 484 }