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 "ev-document-misc.h"
  21 #include <string.h>
  22 #include <gtk/gtk.h>
  23
  24 /* Returns a new GdkPixbuf that is suitable for placing in the thumbnail view.
  25  * It is four pixels wider and taller than the source.  If source_pixbuf is not
  26  * NULL, then it will fill the return pixbuf with the contents of
  27  * source_pixbuf.
  28  */
  29 GdkPixbuf *
  30 ev_document_misc_get_thumbnail_frame (int        width,
  31                                       int        height,
  32                                       GdkPixbuf *source_pixbuf)
  33 {
  34         GdkPixbuf *retval;
  35         guchar *data;
  36         gint rowstride;
  37         int i;
  38         int width_r, height_r;
  39
  40         if (source_pixbuf)
  41                 g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);
  42
  43         if (source_pixbuf) {
  44                 width_r = gdk_pixbuf_get_width (source_pixbuf);
  45                 height_r = gdk_pixbuf_get_height (source_pixbuf);
  46         } else {
  47                 width_r = width;
  48                 height_r = height;
  49         }
  50
  51         /* make sure no one is passing us garbage */
  52         g_assert (width_r >= 0 && height_r >= 0);
  53
  54         retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
  55                                  TRUE, 8,
  56                                  width_r + 4,
  57                                  height_r + 4);
  58
  59         /* make it black and fill in the middle */
  60         data = gdk_pixbuf_get_pixels (retval);
  61         rowstride = gdk_pixbuf_get_rowstride (retval);
  62
  63         gdk_pixbuf_fill (retval, 0x000000ff);
  64         for (i = 1; i < height_r + 1; i++)
  65                 memset (data + (rowstride * i) + 4, 0xffffffff, width_r * 4);
  66
  67         /* copy the source pixbuf */
  68         if (source_pixbuf)
  69                 gdk_pixbuf_copy_area (source_pixbuf, 0, 0,
  70                                       width_r,
  71                                       height_r,
  72                                       retval,
  73                                       1, 1);
  74         /* Add the corner */
  75         data [(width_r + 2) * 4 + 3] = 0;
  76         data [(width_r + 3) * 4 + 3] = 0;
  77         data [(width_r + 2) * 4 + (rowstride * 1) + 3] = 0;
  78         data [(width_r + 3) * 4 + (rowstride * 1) + 3] = 0;
  79
  80         data [(height_r + 2) * rowstride + 3] = 0;
  81         data [(height_r + 3) * rowstride + 3] = 0;
  82         data [(height_r + 2) * rowstride + 4 + 3] = 0;
  83         data [(height_r + 3) * rowstride + 4 + 3] = 0;
  84
  85         return retval;
  86 }
  87
  88 void
  89 ev_document_misc_get_page_border_size (gint       page_width,
  90                                        gint       page_height,
  91                                        GtkBorder *border)
  92 {
  93         g_assert (border);
  94
  95         border->left = 1;
  96         border->top = 1;
  97         if (page_width < 100) {
  98                 border->right = 2;
  99                 border->bottom = 2;
 100         } else if (page_width < 500) {
 101                 border->right = 3;
 102                 border->bottom = 3;
 103         } else {
 104                 border->right = 4;
 105                 border->bottom = 4;
 106         }
 107 }
 108
 109
 110 void
 111 ev_document_misc_paint_one_page (GdkDrawable  *drawable,
 112                                  GtkWidget    *widget,
 113                                  GdkRectangle *area,
 114                                  GtkBorder    *border,
 115                                  gboolean highlight)
 116 {
 117         gdk_draw_rectangle (drawable,
 118                             highlight ?
 119                                     widget->style->text_gc[widget->state] : widget->style->dark_gc[widget->state],
 120                             TRUE,
 121                             area->x,
 122                             area->y,
 123                             area->width,
 124                             area->height);
 125         gdk_draw_rectangle (drawable,
 126                             widget->style->white_gc,
 127                             TRUE,
 128                             area->x + border->left,
 129                             area->y + border->top,
 130                             area->width - (border->left + border->right),
 131                             area->height - (border->top + border->bottom));
 132         gdk_draw_rectangle (drawable,
 133                             widget->style->mid_gc[widget->state],
 134                             TRUE,
 135                             area->x,
 136                             area->y + area->height - (border->bottom - border->top),
 137                             border->bottom - border->top,
 138                             border->bottom - border->top);
 139         gdk_draw_rectangle (drawable,
 140                             widget->style->mid_gc[widget->state],
 141                             TRUE,
 142                             area->x + area->width - (border->right - border->left),
 143                             area->y,
 144                             border->right - border->left,
 145                             border->right - border->left);
 146
 147 }
 148
 149 cairo_surface_t *
 150 ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
 151 {
 152         cairo_surface_t *surface;
 153         cairo_t         *cr;
 154
 155         surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
 156                                               gdk_pixbuf_get_width (pixbuf),
 157                                               gdk_pixbuf_get_height (pixbuf));
 158         cr = cairo_create (surface);
 159         gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
 160         cairo_paint (cr);
 161         cairo_destroy (cr);
 162
 163         return surface;
 164 }
 165
 166 cairo_surface_t *
 167 ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 168                                            gint             dest_width,
 169                                            gint             dest_height,
 170                                            gint             dest_rotation)
 171 {
 172         cairo_surface_t *new_surface;
 173         cairo_t         *cr;
 174         gint             width, height;
 175         gint             new_width = dest_width;
 176         gint             new_height = dest_height;
 177
 178         width = cairo_image_surface_get_width (surface);
 179         height = cairo_image_surface_get_height (surface);
 180
 181         if (dest_width == width &&
 182             dest_height == height &&
 183             dest_rotation == 0) {
 184                 return cairo_surface_reference (surface);
 185         }
 186
 187         if (dest_rotation == 90 || dest_rotation == 270) {
 188                 new_width = dest_height;
 189                 new_height = dest_width;
 190         }
 191
 192         new_surface = cairo_surface_create_similar (surface,
 193                                                     CAIRO_CONTENT_COLOR_ALPHA,
 194                                                     new_width, new_height);
 195
 196         cr = cairo_create (new_surface);
 197         switch (dest_rotation) {
 198                 case 90:
 199                         cairo_translate (cr, new_width, 0);
 200                         break;
 201                 case 180:
 202                         cairo_translate (cr, new_width, new_height);
 203                         break;
 204                 case 270:
 205                         cairo_translate (cr, 0, new_height);
 206                         break;
 207                 default:
 208                         cairo_translate (cr, 0, 0);
 209         }
 210         cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
 211         cairo_scale (cr,
 212                      (gdouble)dest_width / width,
 213                      (gdouble)dest_height / height);
 214         cairo_rotate (cr, dest_rotation * G_PI / 180.0);
 215         cairo_set_source_surface (cr, surface, 0, 0);
 216         cairo_paint (cr);
 217         cairo_destroy (cr);
 218
 219         return new_surface;
 220 }
 221