inicial

1 files changed, 400 insertions, 0 deletions

diff --git a/libdocument/ev-document-misc.c b/libdocument/ev-document-misc.c
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--- /dev/null
+++ b/libdocument/ev-document-misc.c
@@ -0,0 +1,400 @@
+/*
+ *  Copyright (C) 2009 Juanjo Marín <[email protected]>
+ *  Copyright (c) 2007 Carlos Garcia Campos <[email protected]>
+ *  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
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+
+#include <string.h>
+#include <math.h>
+
+#include <gtk/gtk.h>
+
+#include "ev-document-misc.h"
+
+/* 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
+ * source_pixbuf.
+ */
+static GdkPixbuf *
+create_thumbnail_frame (int        width,
+			int        height,
+			GdkPixbuf *source_pixbuf,
+			gboolean   fill_bg)
+{
+	GdkPixbuf *retval;
+	guchar *data;
+	gint rowstride;
+	int i;
+	int width_r, height_r;
+
+	if (source_pixbuf)
+		g_return_val_if_fail (GDK_IS_PIXBUF (source_pixbuf), NULL);
+
+	if (source_pixbuf) {
+		width_r = gdk_pixbuf_get_width (source_pixbuf);
+		height_r = gdk_pixbuf_get_height (source_pixbuf);
+	} else {
+		width_r = width;
+		height_r = height;
+	}
+
+	/* make sure no one is passing us garbage */
+	g_assert (width_r >= 0 && height_r >= 0);
+
+	retval = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
+				 TRUE, 8,
+				 width_r + 4,
+				 height_r + 4);
+
+	/* make it black and fill in the middle */
+	data = gdk_pixbuf_get_pixels (retval);
+	rowstride = gdk_pixbuf_get_rowstride (retval);
+
+	gdk_pixbuf_fill (retval, 0x000000ff);
+	if (fill_bg) {
+		for (i = 1; i < height_r + 1; i++)
+			memset (data + (rowstride * i) + 4, 0xffffffff, width_r * 4);
+	}
+
+	/* copy the source pixbuf */
+	if (source_pixbuf)
+		gdk_pixbuf_copy_area (source_pixbuf, 0, 0,
+				      width_r,
+				      height_r,
+				      retval,
+				      1, 1);
+	/* Add the corner */
+	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;
+
+	return retval;
+}
+
+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);
+}
+
+void
+ev_document_misc_get_page_border_size (gint       page_width,
+				       gint       page_height,
+				       GtkBorder *border)
+{
+	g_assert (border);
+
+	border->left = 1;
+	border->top = 1;
+	if (page_width < 100) {
+		border->right = 2;
+		border->bottom = 2;
+	} else if (page_width < 500) {
+		border->right = 3;
+		border->bottom = 3;
+	} else {
+		border->right = 4;
+		border->bottom = 4;
+	}
+}
+
+
+void
+ev_document_misc_paint_one_page (cairo_t      *cr,
+				 GtkWidget    *widget,
+				 GdkRectangle *area,
+				 GtkBorder    *border,
+				 gboolean      highlight,
+				 gboolean      inverted_colors)
+{
+	GtkStyle    *style = gtk_widget_get_style (widget);
+	GtkStateType state = gtk_widget_get_state (widget);
+
+	gdk_cairo_set_source_color (cr, highlight ? &style->text[state] : &style->dark[state]);
+	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);
+
+	gdk_cairo_set_source_color (cr, &style->mid[state]);
+	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);
+}
+
+cairo_surface_t *
+ev_document_misc_surface_from_pixbuf (GdkPixbuf *pixbuf)
+{
+	cairo_surface_t *surface;
+	cairo_t         *cr;
+
+	surface = cairo_image_surface_create (gdk_pixbuf_get_has_alpha (pixbuf) ?
+					      CAIRO_FORMAT_ARGB32 : CAIRO_FORMAT_RGB24,
+					      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;
+}
+
+GdkPixbuf *
+ev_document_misc_pixbuf_from_surface (cairo_surface_t *surface)
+{
+	GdkPixbuf       *pixbuf;
+	cairo_surface_t *image;
+	cairo_t         *cr;
+	gboolean         has_alpha;
+	gint             width, height;
+	cairo_format_t   surface_format;
+	gint             pixbuf_n_channels;
+	gint             pixbuf_rowstride;
+	guchar          *pixbuf_pixels;
+	gint             x, y;
+
+	width = cairo_image_surface_get_width (surface);
+	height = cairo_image_surface_get_height (surface);
+	
+	surface_format = cairo_image_surface_get_format (surface);
+	has_alpha = (surface_format == CAIRO_FORMAT_ARGB32);
+
+	pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
+				 TRUE, 8,
+				 width, height);
+	pixbuf_n_channels = gdk_pixbuf_get_n_channels (pixbuf);
+	pixbuf_rowstride = gdk_pixbuf_get_rowstride (pixbuf);
+	pixbuf_pixels = gdk_pixbuf_get_pixels (pixbuf);
+
+	image = cairo_image_surface_create_for_data (pixbuf_pixels,
+						     surface_format,
+						     width, height,
+						     pixbuf_rowstride);
+	cr = cairo_create (image);
+	cairo_set_source_surface (cr, surface, 0, 0);
+
+	if (has_alpha)
+		cairo_mask_surface (cr, surface, 0, 0);
+	else
+		cairo_paint (cr);
+
+	cairo_destroy (cr);
+	cairo_surface_destroy (image);
+
+	for (y = 0; y < height; y++) {
+		guchar *p = pixbuf_pixels + y * pixbuf_rowstride;
+
+		for (x = 0; x < width; x++) {
+			guchar tmp;
+			
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
+			tmp = p[0];
+			p[0] = p[2];
+			p[2] = tmp;
+			p[3] = (has_alpha) ? p[3] : 0xff;
+#else
+			tmp = p[0];
+			p[0] = p[1];
+			p[1] = p[2];
+			p[2] = p[3];
+			p[3] = (has_alpha) ? tmp : 0xff;
+#endif			
+			p += pixbuf_n_channels;
+		}
+	}
+
+	return pixbuf;
+}
+
+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,
+						    cairo_surface_get_content (surface),
+						    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);
+	}
+	
+	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);
+	}
+	
+	cairo_rotate (cr, dest_rotation * G_PI / 180.0);
+	cairo_set_source_surface (cr, surface, 0, 0);
+	cairo_paint (cr);
+	cairo_destroy (cr);
+
+	return new_surface;
+}
+
+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);
+}
+
+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];
+		}
+	}
+}
+
+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);
+}
+
+/* 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);
+}