libdocument/ev-document-misc.c

   1 /*
   2  *  Copyright (C) 2009 Juanjo Marín <juanj.marin@juntadeandalucia.es>
   3  *  Copyright (c) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
   4  *  Copyright (C) 2000-2003 Marco Pesenti Gritti
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2, or (at your option)
   9  *  any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <string.h>
  24
  25 #include <gtk/gtk.h>
  26
  27 #include "ev-document-misc.h"
  28
  29 /* Returns a new GdkPixbuf that is suitable for placing in the thumbnail view.
  30  * It is four pixels wider and taller than the source.  If source_pixbuf is not
  31  * NULL, then it will fill the return pixbuf with the contents of
  32  * source_pixbuf.
  33  */
  34 GdkPixbuf *
  35 ev_document_misc_get_thumbnail_frame (int        width,
  36                                       int        height,
  37                                       GdkPixbuf *source_pixbuf)
  38 {
  39         GdkPixbuf *retval;
  40         guchar *data;
  41         gint rowstride;
  42         int i;
  43         int width_r, height_r;
  44
  45         if (source_pixbuf)
  46                 g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);
  47
  48         if (source_pixbuf) {
  49                 width_r = gdk_pixbuf_get_width (source_pixbuf);
  50                 height_r = gdk_pixbuf_get_height (source_pixbuf);
  51         } else {
  52                 width_r = width;
  53                 height_r = height;
  54         }
  55
  56         /* make sure no one is passing us garbage */
  57         g_assert (width_r >= 0 && height_r >= 0);
  58
  59         retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
  60                                  TRUE, 8,
  61                                  width_r + 4,
  62                                  height_r + 4);
  63
  64         /* make it black and fill in the middle */
  65         data = gdk_pixbuf_get_pixels (retval);
  66         rowstride = gdk_pixbuf_get_rowstride (retval);
  67
  68         gdk_pixbuf_fill (retval, 0x000000ff);
  69         for (i = 1; i < height_r + 1; i++)
  70                 memset (data + (rowstride * i) + 4, 0xffffffff, width_r * 4);
  71
  72         /* copy the source pixbuf */
  73         if (source_pixbuf)
  74                 gdk_pixbuf_copy_area (source_pixbuf, 0, 0,
  75                                       width_r,
  76                                       height_r,
  77                                       retval,
  78                                       1, 1);
  79         /* Add the corner */
  80         data [(width_r + 2) * 4 + 3] = 0;
  81         data [(width_r + 3) * 4 + 3] = 0;
  82         data [(width_r + 2) * 4 + (rowstride * 1) + 3] = 0;
  83         data [(width_r + 3) * 4 + (rowstride * 1) + 3] = 0;
  84
  85         data [(height_r + 2) * rowstride + 3] = 0;
  86         data [(height_r + 3) * rowstride + 3] = 0;
  87         data [(height_r + 2) * rowstride + 4 + 3] = 0;
  88         data [(height_r + 3) * rowstride + 4 + 3] = 0;
  89
  90         return retval;
  91 }
  92
  93 void
  94 ev_document_misc_get_page_border_size (gint       page_width,
  95                                        gint       page_height,
  96                                        GtkBorder *border)
  97 {
  98         g_assert (border);
  99
 100         border->left = 1;
 101         border->top = 1;
 102         if (page_width < 100) {
 103                 border->right = 2;
 104                 border->bottom = 2;
 105         } else if (page_width < 500) {
 106                 border->right = 3;
 107                 border->bottom = 3;
 108         } else {
 109                 border->right = 4;
 110                 border->bottom = 4;
 111         }
 112 }
 113
 114
 115 void
 116 ev_document_misc_paint_one_page (GdkDrawable  *drawable,
 117                                  GtkWidget    *widget,
 118                                  GdkRectangle *area,
 119                                  GtkBorder    *border,
 120                                  gboolean highlight)
 121 {
 122         gdk_draw_rectangle (drawable,
 123                             highlight ?
 124                                     widget->style->text_gc[widget->state] : widget->style->dark_gc[widget->state],
 125                             TRUE,
 126                             area->x,
 127                             area->y,
 128                             area->width,
 129                             area->height);
 130         gdk_draw_rectangle (drawable,
 131                             widget->style->white_gc,
 132                             TRUE,
 133                             area->x + border->left,
 134                             area->y + border->top,
 135                             area->width - (border->left + border->right),
 136                             area->height - (border->top + border->bottom));
 137         gdk_draw_rectangle (drawable,
 138                             widget->style->mid_gc[widget->state],
 139                             TRUE,
 140                             area->x,
 141                             area->y + area->height - (border->bottom - border->top),
 142                             border->bottom - border->top,
 143                             border->bottom - border->top);
 144         gdk_draw_rectangle (drawable,
 145                             widget->style->mid_gc[widget->state],
 146                             TRUE,
 147                             area->x + area->width - (border->right - border->left),
 148                             area->y,
 149                             border->right - border->left,
 150                             border->right - border->left);
 151
 152 }
 153
 154 cairo_surface_t *
 155 ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
 156 {
 157         cairo_surface_t *surface;
 158         cairo_t         *cr;
 159
 160         surface = cairo_image_surface_create (gdk_pixbuf_get_has_alpha (pixbuf) ?
 161                                               CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
 162                                               gdk_pixbuf_get_width (pixbuf),
 163                                               gdk_pixbuf_get_height (pixbuf));
 164         cr = cairo_create (surface);
 165         gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 166         cairo_paint (cr);
 167         cairo_destroy (cr);
 168
 169         return surface;
 170 }
 171
 172 GdkPixbuf *
 173 ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
 174 {
 175         GdkPixbuf       *pixbuf;
 176         cairo_surface_t *image;
 177         cairo_t         *cr;
 178         gboolean         has_alpha;
 179         gint             width, height;
 180         cairo_format_t   surface_format;
 181         gint             pixbuf_n_channels;
 182         gint             pixbuf_rowstride;
 183         guchar          *pixbuf_pixels;
 184         gint             x, y;
 185
 186         width = cairo_image_surface_get_width (surface);
 187         height = cairo_image_surface_get_height (surface);
 188
 189         surface_format = cairo_image_surface_get_format (surface);
 190         has_alpha = (surface_format == CAIRO_FORMAT_ARGB32);
 191
 192         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
 193                                  TRUE, 8,
 194                                  width, height);
 195         pixbuf_n_channels = gdk_pixbuf_get_n_channels (pixbuf);
 196         pixbuf_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 197         pixbuf_pixels = gdk_pixbuf_get_pixels (pixbuf);
 198
 199         image = cairo_image_surface_create_for_data (pixbuf_pixels,
 200                                                      surface_format,
 201                                                      width, height,
 202                                                      pixbuf_rowstride);
 203         cr = cairo_create (image);
 204         cairo_set_source_surface (cr, surface, 0, 0);
 205
 206         if (has_alpha)
 207                 cairo_mask_surface (cr, surface, 0, 0);
 208         else
 209                 cairo_paint (cr);
 210
 211         cairo_destroy (cr);
 212         cairo_surface_destroy (image);
 213
 214         for (y = 0; y < height; y++) {
 215                 guchar *p = pixbuf_pixels + y * pixbuf_rowstride;
 216
 217                 for (x = 0; x < width; x++) {
 218                         guchar tmp;
 219
 220 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 221                         tmp = p[0];
 222                         p[0] = p[2];
 223                         p[2] = tmp;
 224                         p[3] = (has_alpha) ? p[3] : 0xff;
 225 #else
 226                         tmp = p[0];
 227                         p[0] = p[1];
 228                         p[1] = p[2];
 229                         p[2] = p[3];
 230                         p[3] = (has_alpha) ? tmp : 0xff;
 231 #endif
 232                         p += pixbuf_n_channels;
 233                 }
 234         }
 235
 236         return pixbuf;
 237 }
 238
 239 cairo_surface_t *
 240 ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 241                                            gint             dest_width,
 242                                            gint             dest_height,
 243                                            gint             dest_rotation)
 244 {
 245         cairo_surface_t *new_surface;
 246         cairo_t         *cr;
 247         gint             width, height;
 248         gint             new_width = dest_width;
 249         gint             new_height = dest_height;
 250
 251         width = cairo_image_surface_get_width (surface);
 252         height = cairo_image_surface_get_height (surface);
 253
 254         if (dest_width == width &&
 255             dest_height == height &&
 256             dest_rotation == 0) {
 257                 return cairo_surface_reference (surface);
 258         }
 259
 260         if (dest_rotation == 90 || dest_rotation == 270) {
 261                 new_width = dest_height;
 262                 new_height = dest_width;
 263         }
 264
 265         new_surface = cairo_surface_create_similar (surface,
 266                                                     cairo_surface_get_content (surface),
 267                                                     new_width, new_height);
 268
 269         cr = cairo_create (new_surface);
 270         switch (dest_rotation) {
 271                 case 90:
 272                         cairo_translate (cr, new_width, 0);
 273                         break;
 274                 case 180:
 275                         cairo_translate (cr, new_width, new_height);
 276                         break;
 277                 case 270:
 278                         cairo_translate (cr, 0, new_height);
 279                         break;
 280                 default:
 281                         cairo_translate (cr, 0, 0);
 282         }
 283
 284         if (dest_width != width || dest_height != height) {
 285                 cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
 286                 cairo_scale (cr,
 287                              (gdouble)dest_width / width,
 288                              (gdouble)dest_height / height);
 289         }
 290
 291         cairo_rotate (cr, dest_rotation * G_PI / 180.0);
 292         cairo_set_source_surface (cr, surface, 0, 0);
 293         cairo_paint (cr);
 294         cairo_destroy (cr);
 295
 296         return new_surface;
 297 }
 298
 299 void
 300 ev_document_misc_invert_surface (cairo_surface_t *surface) {
 301 #if CAIRO_VERSION > CAIRO_VERSION_ENCODE(1, 9, 2)
 302         cairo_t *cr;
 303
 304         cr = cairo_create (surface);
 305
 306         /* white + DIFFERENCE -> invert */
 307         cairo_set_operator (cr, CAIRO_OPERATOR_DIFFERENCE);
 308         cairo_set_source_rgb (cr, 1., 1., 1.);
 309         cairo_paint(cr);
 310         cairo_destroy (cr);
 311 #else
 312         guchar *data;
 313         gint    rowstride;
 314         gint    width, height;
 315         gint    x, y;
 316
 317         data = cairo_image_surface_get_data (surface);
 318         rowstride = cairo_image_surface_get_stride (surface);
 319         width = cairo_image_surface_get_width (surface);
 320         height = cairo_image_surface_get_height (surface);
 321
 322         for (y = 0; y < height; y++) {
 323                 guchar *p = data + y * rowstride;
 324
 325                 for (x = 0; x < width; x++) {
 326                         p[0] = 255 - p[0];
 327                         p[1] = 255 - p[1];
 328                         p[2] = 255 - p[2];
 329                         p += 4;
 330                 }
 331         }
 332
 333         cairo_surface_mark_dirty (surface);
 334 #endif
 335 }
 336
 337 void
 338 ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf)
 339 {
 340         guchar *data, *p;
 341         guint   width, height, x, y, rowstride, n_channels;
 342
 343         n_channels = gdk_pixbuf_get_n_channels (pixbuf);
 344         g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
 345         g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);
 346
 347         /* First grab a pointer to the raw pixel data. */
 348         data = gdk_pixbuf_get_pixels (pixbuf);
 349
 350         /* Find the number of bytes per row (could be padded). */
 351         rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 352
 353         width = gdk_pixbuf_get_width (pixbuf);
 354         height = gdk_pixbuf_get_height (pixbuf);
 355         for (x = 0; x < width; x++) {
 356                 for (y = 0; y < height; y++) {
 357                         /* Calculate pixel's offset into the data array. */
 358                         p = data + x * n_channels + y * rowstride;
 359                         /* Change the RGB values*/
 360                         p[0] = 255 - p[0];
 361                         p[1] = 255 - p[1];
 362                         p[2] = 255 - p[2];
 363                 }
 364         }
 365 }