libdocument/ev-document-misc.c

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