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