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 GdkPixbuf *
 167 ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
 168 {
 169         GdkPixbuf       *pixbuf;
 170         cairo_surface_t *image;
 171         cairo_t         *cr;
 172         gboolean         has_alpha;
 173         gint             width, height;
 174         cairo_format_t   surface_format;
 175         gint             pixbuf_n_channels;
 176         gint             pixbuf_rowstride;
 177         guchar          *pixbuf_pixels;
 178         gint             x, y;
 179
 180         width = cairo_image_surface_get_width (surface);
 181         height = cairo_image_surface_get_height (surface);
 182
 183         surface_format = cairo_image_surface_get_format (surface);
 184         has_alpha = (surface_format == CAIRO_FORMAT_ARGB32);
 185
 186         pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
 187                                  TRUE, 8,
 188                                  width, height);
 189         pixbuf_n_channels = gdk_pixbuf_get_n_channels (pixbuf);
 190         pixbuf_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
 191         pixbuf_pixels = gdk_pixbuf_get_pixels (pixbuf);
 192
 193         image = cairo_image_surface_create_for_data (pixbuf_pixels,
 194                                                      surface_format,
 195                                                      width, height,
 196                                                      pixbuf_rowstride);
 197         cr = cairo_create (image);
 198         cairo_set_source_surface (cr, surface, 0, 0);
 199
 200         if (has_alpha)
 201                 cairo_mask_surface (cr, surface, 0, 0);
 202         else
 203                 cairo_paint (cr);
 204
 205         cairo_destroy (cr);
 206         cairo_surface_destroy (image);
 207
 208         for (y = 0; y < height; y++) {
 209                 guchar *p = pixbuf_pixels + y * pixbuf_rowstride;
 210
 211                 for (x = 0; x < width; x++) {
 212                         guchar tmp;
 213
 214 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 215                         tmp = p[0];
 216                         p[0] = p[2];
 217                         p[2] = tmp;
 218                         p[3] = (has_alpha) ? p[3] : 0xff;
 219 #else
 220                         tmp = p[0];
 221                         p[0] = (has_alpha) ? p[3] : 0xff;
 222                         p[3] = p[2];
 223                         p[2] = p[1];
 224                         p[1] = tmp;
 225 #endif
 226                         p += pixbuf_n_channels;
 227                 }
 228         }
 229
 230         return pixbuf;
 231 }
 232
 233 cairo_surface_t *
 234 ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
 235                                            gint             dest_width,
 236                                            gint             dest_height,
 237                                            gint             dest_rotation)
 238 {
 239         cairo_surface_t *new_surface;
 240         cairo_t         *cr;
 241         gint             width, height;
 242         gint             new_width = dest_width;
 243         gint             new_height = dest_height;
 244
 245         width = cairo_image_surface_get_width (surface);
 246         height = cairo_image_surface_get_height (surface);
 247
 248         if (dest_width == width &&
 249             dest_height == height &&
 250             dest_rotation == 0) {
 251                 return cairo_surface_reference (surface);
 252         }
 253
 254         if (dest_rotation == 90 || dest_rotation == 270) {
 255                 new_width = dest_height;
 256                 new_height = dest_width;
 257         }
 258
 259         new_surface = cairo_surface_create_similar (surface,
 260                                                     CAIRO_CONTENT_COLOR_ALPHA,
 261                                                     new_width, new_height);
 262
 263         cr = cairo_create (new_surface);
 264         switch (dest_rotation) {
 265                 case 90:
 266                         cairo_translate (cr, new_width, 0);
 267                         break;
 268                 case 180:
 269                         cairo_translate (cr, new_width, new_height);
 270                         break;
 271                 case 270:
 272                         cairo_translate (cr, 0, new_height);
 273                         break;
 274                 default:
 275                         cairo_translate (cr, 0, 0);
 276         }
 277
 278         if (dest_width != width || dest_height != height) {
 279                 cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
 280                 cairo_scale (cr,
 281                              (gdouble)dest_width / width,
 282                              (gdouble)dest_height / height);
 283         }
 284
 285         cairo_rotate (cr, dest_rotation * G_PI / 180.0);
 286         cairo_set_source_surface (cr, surface, 0, 0);
 287         cairo_paint (cr);
 288         cairo_destroy (cr);
 289
 290         return new_surface;
 291 }
 292