ev-document-misc.c 10.6 KB
Newer Older
1
/*
2
 *  Copyright (C) 2009 Juanjo Marín <juanj.marin@juntadeandalucia.es>
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
 *  Copyright (c) 2007 Carlos Garcia Campos <carlosgc@gnome.org>
 *  Copyright (C) 2000-2003 Marco Pesenti Gritti
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
18
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19
 */
20

21
#include <config.h>
22

23
#include <string.h>
24
#include <math.h>
25

26
#include <gtk/gtk.h>
27

28 29
#include "ev-document-misc.h"

30 31 32
/* Returns a new GdkPixbuf that is suitable for placing in the thumbnail view.
 * It is four pixels wider and taller than the source.  If source_pixbuf is not
 * NULL, then it will fill the return pixbuf with the contents of
33 34
 * source_pixbuf.
 */
35 36 37 38 39
static GdkPixbuf *
create_thumbnail_frame (int        width,
			int        height,
			GdkPixbuf *source_pixbuf,
			gboolean   fill_bg)
40 41 42 43
{
	GdkPixbuf *retval;
	guchar *data;
	gint rowstride;
44
	int i;
45 46
	int width_r, height_r;

47 48 49 50
	if (source_pixbuf)
		g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);

	if (source_pixbuf) {
51 52 53
		width_r = gdk_pixbuf_get_width (source_pixbuf);
		height_r = gdk_pixbuf_get_height (source_pixbuf);
	} else {
54 55
		width_r = width;
		height_r = height;
56 57 58
	}

	/* make sure no one is passing us garbage */
59
	g_return_val_if_fail (width_r >= 0 && height_r >= 0, NULL);
60 61 62

	retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
				 TRUE, 8,
63 64
				 width_r + 4,
				 height_r + 4);
65 66 67 68 69

	/* make it black and fill in the middle */
	data = gdk_pixbuf_get_pixels (retval);
	rowstride = gdk_pixbuf_get_rowstride (retval);

70
	gdk_pixbuf_fill (retval, 0x000000ff);
71 72 73 74
	if (fill_bg) {
		for (i = 1; i < height_r + 1; i++)
			memset (data + (rowstride * i) + 4, 0xffffffff, width_r * 4);
	}
75 76

	/* copy the source pixbuf */
77 78
	if (source_pixbuf)
		gdk_pixbuf_copy_area (source_pixbuf, 0, 0,
79 80
				      width_r,
				      height_r,
81 82 83
				      retval,
				      1, 1);
	/* Add the corner */
84 85 86 87 88 89 90 91 92
	data [(width_r + 2) * 4 + 3] = 0;
	data [(width_r + 3) * 4 + 3] = 0;
	data [(width_r + 2) * 4 + (rowstride * 1) + 3] = 0;
	data [(width_r + 3) * 4 + (rowstride * 1) + 3] = 0;

	data [(height_r + 2) * rowstride + 3] = 0;
	data [(height_r + 3) * rowstride + 3] = 0;
	data [(height_r + 2) * rowstride + 4 + 3] = 0;
	data [(height_r + 3) * rowstride + 4 + 3] = 0;
93 94 95

	return retval;
}
96

97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
GdkPixbuf *
ev_document_misc_get_thumbnail_frame (int        width,
				      int        height,
				      GdkPixbuf *source_pixbuf)
{
	return create_thumbnail_frame (width, height, source_pixbuf, TRUE);
}

GdkPixbuf *
ev_document_misc_get_loading_thumbnail (int      width,
					int      height,
					gboolean inverted_colors)
{
	return create_thumbnail_frame (width, height, NULL, !inverted_colors);
}

113
void
114 115 116
ev_document_misc_get_page_border_size (gint       page_width,
				       gint       page_height,
				       GtkBorder *border)
117
{
118
	g_assert (border);
119

120 121
	border->left = 1;
	border->top = 1;
122
	if (page_width < 100) {
123 124
		border->right = 2;
		border->bottom = 2;
125
	} else if (page_width < 500) {
126 127
		border->right = 3;
		border->bottom = 3;
128
	} else {
129 130
		border->right = 4;
		border->bottom = 4;
131 132 133
	}
}

134 135

void
136
ev_document_misc_paint_one_page (cairo_t      *cr,
137 138
				 GtkWidget    *widget,
				 GdkRectangle *area,
139
				 GtkBorder    *border,
140 141
				 gboolean      highlight,
				 gboolean      inverted_colors)
142
{
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
	GtkStyleContext *context = gtk_widget_get_style_context (widget);
	GtkStateFlags state = gtk_widget_get_state_flags (widget);
        GdkRGBA fg, bg, shade_bg;
        GtkSymbolicColor *c1, *c2;

        gtk_style_context_get_background_color (context, state, &bg);
        gtk_style_context_get_color (context, state, &fg);

        // FIXME: should we cache the shade_bg?
        c1 = gtk_symbolic_color_new_literal (&bg);
        c2 = gtk_symbolic_color_new_shade (c1, 0.7);
        gtk_symbolic_color_resolve (c2, NULL, &shade_bg);
        gtk_symbolic_color_unref (c1);
        gtk_symbolic_color_unref (c2);

	gdk_cairo_set_source_rgba (cr, highlight ? &fg : &shade_bg);
159 160 161 162 163 164 165 166 167 168 169 170 171 172
	gdk_cairo_rectangle (cr, area);
	cairo_fill (cr);

	if (inverted_colors)
		cairo_set_source_rgb (cr, 0, 0, 0);
	else
		cairo_set_source_rgb (cr, 1, 1, 1);
	cairo_rectangle (cr,
			 area->x + border->left,
			 area->y + border->top,
			 area->width - (border->left + border->right),
			 area->height - (border->top + border->bottom));
	cairo_fill (cr);

173
	gdk_cairo_set_source_rgba (cr, &bg);
174 175 176 177 178 179 180 181 182 183 184 185 186
	cairo_rectangle (cr,
			 area->x,
			 area->y + area->height - (border->bottom - border->top),
			 border->bottom - border->top,
			 border->bottom - border->top);
	cairo_fill (cr);

	cairo_rectangle (cr,
			 area->x + area->width - (border->right - border->left),
			 area->y,
			 border->right - border->left,
			 border->right - border->left);
	cairo_fill (cr);
187
}
188 189 190 191 192 193

cairo_surface_t *
ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
{
	cairo_surface_t *surface;
	cairo_t         *cr;
194

195 196
	g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);

197 198
	surface = cairo_image_surface_create (gdk_pixbuf_get_has_alpha (pixbuf) ?
					      CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
199 200 201 202 203 204 205 206 207 208
					      gdk_pixbuf_get_width (pixbuf),
					      gdk_pixbuf_get_height (pixbuf));
	cr = cairo_create (surface);
	gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
	cairo_paint (cr);
	cairo_destroy (cr);
	
	return surface;
}

Carlos Garcia Campos's avatar
Carlos Garcia Campos committed
209 210 211
GdkPixbuf *
ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
{
212 213
	g_return_val_if_fail (surface, NULL);	

214 215 216 217
        return gdk_pixbuf_get_from_surface (surface,
                                            0, 0,
                                            cairo_image_surface_get_width (surface),
                                            cairo_image_surface_get_height (surface));
Carlos Garcia Campos's avatar
Carlos Garcia Campos committed
218 219
}

220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
cairo_surface_t *
ev_document_misc_surface_rotate_and_scale (cairo_surface_t *surface,
					   gint             dest_width,
					   gint             dest_height,
					   gint             dest_rotation)
{
	cairo_surface_t *new_surface;
	cairo_t         *cr;
	gint             width, height;
	gint             new_width = dest_width;
	gint             new_height = dest_height;

	width = cairo_image_surface_get_width (surface);
	height = cairo_image_surface_get_height (surface);
	
	if (dest_width == width &&
	    dest_height == height &&
	    dest_rotation == 0) {
		return cairo_surface_reference (surface);
	}

	if (dest_rotation == 90 || dest_rotation == 270) {
		new_width = dest_height;
		new_height = dest_width;
	}

	new_surface = cairo_surface_create_similar (surface,
247
						    cairo_surface_get_content (surface),
248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263
						    new_width, new_height);

	cr = cairo_create (new_surface);
	switch (dest_rotation) {
	        case 90:
			cairo_translate (cr, new_width, 0);
			break;
	        case 180:
			cairo_translate (cr, new_width, new_height);
			break;
	        case 270:
			cairo_translate (cr, 0, new_height);
			break;
	        default:
			cairo_translate (cr, 0, 0);
	}
Hib Eris's avatar
Hib Eris committed
264
	cairo_rotate (cr, dest_rotation * G_PI / 180.0);
Carlos Garcia Campos's avatar
Carlos Garcia Campos committed
265 266 267 268 269 270 271 272
	
	if (dest_width != width || dest_height != height) {
		cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
		cairo_scale (cr,
			     (gdouble)dest_width / width,
			     (gdouble)dest_height / height);
	}
	
273 274 275 276 277 278
	cairo_set_source_surface (cr, surface, 0, 0);
	cairo_paint (cr);
	cairo_destroy (cr);

	return new_surface;
}
279

280 281 282 283 284 285 286 287 288 289 290 291 292
void
ev_document_misc_invert_surface (cairo_surface_t *surface) {
	cairo_t *cr;

	cr = cairo_create (surface);

	/* white + DIFFERENCE -> invert */
	cairo_set_operator (cr, CAIRO_OPERATOR_DIFFERENCE);
	cairo_set_source_rgb (cr, 1., 1., 1.);
	cairo_paint(cr);
	cairo_destroy (cr);
}

293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321
void
ev_document_misc_invert_pixbuf (GdkPixbuf *pixbuf)
{
	guchar *data, *p;
	guint   width, height, x, y, rowstride, n_channels;

	n_channels = gdk_pixbuf_get_n_channels (pixbuf);
	g_assert (gdk_pixbuf_get_colorspace (pixbuf) == GDK_COLORSPACE_RGB);
	g_assert (gdk_pixbuf_get_bits_per_sample (pixbuf) == 8);

	/* First grab a pointer to the raw pixel data. */
	data = gdk_pixbuf_get_pixels (pixbuf);

	/* Find the number of bytes per row (could be padded). */
	rowstride = gdk_pixbuf_get_rowstride (pixbuf);

	width = gdk_pixbuf_get_width (pixbuf);
	height = gdk_pixbuf_get_height (pixbuf);
	for (x = 0; x < width; x++) {
		for (y = 0; y < height; y++) {
			/* Calculate pixel's offset into the data array. */
			p = data + x * n_channels + y * rowstride;
			/* Change the RGB values*/
			p[0] = 255 - p[0];
			p[1] = 255 - p[1];
			p[2] = 255 - p[2];
		}
	}
}
322 323 324 325 326 327 328 329 330 331 332 333 334 335

gdouble
ev_document_misc_get_screen_dpi (GdkScreen *screen)
{
	gdouble dp, di;

	/*diagonal in pixels*/
	dp = hypot (gdk_screen_get_width (screen), gdk_screen_get_height (screen));

	/*diagonal in inches*/
	di = hypot (gdk_screen_get_width_mm(screen), gdk_screen_get_height_mm (screen)) / 25.4;

	return (dp / di);
}
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358

/* Returns a locale specific date and time representation */
gchar *
ev_document_misc_format_date (GTime utime)
{
	time_t time = (time_t) utime;
	char s[256];
	const char fmt_hack[] = "%c";
	size_t len;
#ifdef HAVE_LOCALTIME_R
	struct tm t;
	if (time == 0 || !localtime_r (&time, &t)) return NULL;
	len = strftime (s, sizeof (s), fmt_hack, &t);
#else
	struct tm *t;
	if (time == 0 || !(t = localtime (&time)) ) return NULL;
	len = strftime (s, sizeof (s), fmt_hack, t);
#endif

	if (len == 0 || s[0] == '\0') return NULL;

	return g_locale_to_utf8 (s, -1, NULL, NULL, NULL);
}
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391

void
ev_document_misc_get_pointer_position (GtkWidget *widget,
                                       gint      *x,
                                       gint      *y)
{
        GdkDeviceManager *device_manager;
        GdkDevice        *device_pointer;
        GdkRectangle      allocation;

        if (x)
                *x = -1;
        if (y)
                *y = -1;

        if (!gtk_widget_get_realized (widget))
                return;

        device_manager = gdk_display_get_device_manager (gtk_widget_get_display (widget));
        device_pointer = gdk_device_manager_get_client_pointer (device_manager);
        gdk_window_get_device_position (gtk_widget_get_window (widget),
                                        device_pointer,
                                        x, y, NULL);

        if (gtk_widget_get_has_window (widget))
                return;

        gtk_widget_get_allocation (widget, &allocation);
        if (x)
                *x -= allocation.x;
        if (y)
                *y -= allocation.y;
}