From 68d0fc3c59185065d9694ba3f8cb2665b984eb9f Mon Sep 17 00:00:00 2001
From: Carlos Garcia Campos <carlosgc@gnome.org>
Date: Sun, 18 Jan 2009 11:53:54 +0000
Subject: Move EvView specific code to a libeviview library so that it can be

2009-01-18  Carlos Garcia Campos  <carlosgc@gnome.org>

	* configure.ac:
	* Makefile.am:
	* libdocument/Makefile.am:
	* libview/Makefile.am:
	* libview/ev-job-scheduler.[ch]:
	* libview/ev-jobs.[ch]:
	* libview/ev-page-cache.[ch]:
	* libview/ev-pixbuf-cache.[ch]:
	* libview/ev-timeline.[ch]:
	* libview/ev-transition-animation.[ch]:
	* libview/ev-view-accessible.[ch]:
	* libview/ev-view-marshal.list:
	* libview/ev-view.[ch]:
	* shell/Makefile.am:

	Move EvView specific code to a libeviview library so that it can
	be embbeded in other applications. Based on patches by Tomeu
	Vizoso. Fixes bug #567751.

svn path=/trunk/; revision=3348
---
(limited to 'libview/ev-page-cache.c')

diff --git a/libview/ev-page-cache.c b/libview/ev-page-cache.c
new file mode 100644
index 0000000..a8639ef
--- /dev/null
+++ b/libview/ev-page-cache.c
@@ -0,0 +1,714 @@
+#include <config.h>
+#include "ev-page-cache.h"
+#include "ev-document-thumbnails.h"
+#include "ev-page.h"
+#include <stdlib.h>
+#include <string.h>
+
+#define THUMBNAIL_WIDTH 100
+
+typedef struct _EvPageCacheInfo
+{
+	double width;
+	double height;
+} EvPageCacheInfo;
+
+typedef struct _EvPageThumbsInfo
+{
+	gint width;
+	gint height;
+} EvPageThumbsInfo;
+
+struct _EvPageCache
+{
+	GObject parent;
+
+	gint current_page;
+	int n_pages;
+	char *title;
+	char **page_labels;
+	
+	gint max_label_chars;
+	gboolean has_labels;
+	gboolean uniform;
+	gboolean dual_even_left;
+	
+	double uniform_width;
+	double uniform_height;
+
+	double  max_width;
+	double  max_height;
+
+	double* height_to_page;
+	double* dual_height_to_page;
+
+	int rotation;
+
+	EvPageCacheInfo *size_cache;
+	EvDocumentInfo *page_info;
+
+	/* Thumbnail dimensions */
+	gboolean thumbs_uniform;
+	gint thumbs_uniform_width;
+	gint thumbs_uniform_height;
+	gint thumbs_max_width;
+	gint thumbs_max_height;
+	EvPageThumbsInfo *thumbs_size_cache;
+};
+
+struct _EvPageCacheClass
+{
+	GObjectClass parent_class;
+
+	void (* page_changed) (EvPageCache *page_cache, gint page);
+	void (* history_changed) (EvPageCache *page_cache, gint page);
+};
+
+enum
+{
+	PAGE_CHANGED,
+	HISTORY_CHANGED,
+	N_SIGNALS,
+};
+
+static guint signals[N_SIGNALS] = {0, };
+
+static void ev_page_cache_init       (EvPageCache      *page_cache);
+static void ev_page_cache_class_init (EvPageCacheClass *page_cache);
+static void ev_page_cache_finalize   (GObject *object);
+
+G_DEFINE_TYPE (EvPageCache, ev_page_cache, G_TYPE_OBJECT)
+
+static void
+ev_page_cache_init (EvPageCache *page_cache)
+{
+	page_cache->current_page = -1;
+	page_cache->max_label_chars = 0;
+}
+
+static void
+ev_page_cache_class_init (EvPageCacheClass *class)
+{
+	GObjectClass *object_class;
+
+	object_class = G_OBJECT_CLASS (class);
+
+	object_class->finalize = ev_page_cache_finalize;
+
+	signals [PAGE_CHANGED] =
+		g_signal_new ("page-changed",
+			      EV_TYPE_PAGE_CACHE,
+			      G_SIGNAL_RUN_LAST,
+			      G_STRUCT_OFFSET (EvPageCacheClass, page_changed),
+			      NULL, NULL,
+			      g_cclosure_marshal_VOID__INT,
+			      G_TYPE_NONE, 1,
+			      G_TYPE_INT);
+
+	signals [HISTORY_CHANGED] =
+		g_signal_new ("history-changed",
+			      EV_TYPE_PAGE_CACHE,
+			      G_SIGNAL_RUN_LAST,
+			      G_STRUCT_OFFSET (EvPageCacheClass, history_changed),
+			      NULL, NULL,
+			      g_cclosure_marshal_VOID__INT,
+			      G_TYPE_NONE, 1,
+			      G_TYPE_INT);
+
+}
+
+static void
+ev_page_cache_finalize (GObject *object)
+{
+	EvPageCache *page_cache;
+
+	page_cache = EV_PAGE_CACHE (object);
+
+	if (page_cache->title) {
+		g_free (page_cache->title);
+		page_cache->title = NULL;
+	}
+
+	if (page_cache->size_cache) {
+		g_free (page_cache->size_cache);
+		page_cache->size_cache = NULL;
+	}
+
+	if (page_cache->thumbs_size_cache) {
+		g_free (page_cache->thumbs_size_cache);
+		page_cache->thumbs_size_cache = NULL;
+	}
+
+	if (page_cache->height_to_page) {
+		g_free (page_cache->height_to_page);
+		page_cache->height_to_page = NULL;
+	}
+
+	if (page_cache->dual_height_to_page) {
+		g_free (page_cache->dual_height_to_page);
+		page_cache->dual_height_to_page = NULL;
+	}
+
+	if (page_cache->page_labels) {
+		gint i;
+
+		for (i = 0; i < page_cache->n_pages; i++) {
+			if (page_cache->page_labels[i])
+				g_free (page_cache->page_labels[i]);
+		}
+		g_free (page_cache->page_labels);
+		page_cache->page_labels = NULL;
+	}
+
+	if (page_cache->page_info) {
+		ev_document_info_free (page_cache->page_info);
+		page_cache->page_info = NULL;
+	}
+
+	G_OBJECT_CLASS (ev_page_cache_parent_class)->finalize (object);
+}
+
+static void
+build_height_to_page (EvPageCache *page_cache)
+{
+	gboolean swap;
+	int i;
+	double uniform_height, page_height, next_page_height;
+	double saved_height;
+
+	swap = (page_cache->rotation == 90 ||
+		page_cache->rotation == 270);
+
+	g_free (page_cache->height_to_page);
+	g_free (page_cache->dual_height_to_page);
+
+	page_cache->height_to_page = g_new0(double, page_cache->n_pages + 1);
+	page_cache->dual_height_to_page = g_new0(double, page_cache->n_pages + 2);
+	
+	saved_height = 0;
+	for (i = 0; i <= page_cache->n_pages; i++) {
+		if (page_cache->uniform) {
+			if (!swap) {
+				uniform_height = page_cache->uniform_height;
+			} else {
+				uniform_height = page_cache->uniform_width;
+			}
+			page_cache->height_to_page [i] = i * uniform_height;
+		} else {
+			if (i < page_cache->n_pages) {
+				if (!swap) {
+					page_height = page_cache->size_cache [i].height;
+				} else {
+					page_height = page_cache->size_cache [i].width;
+				}
+			} else {
+				page_height = 0;
+			}
+			page_cache->height_to_page [i] = saved_height;
+			saved_height += page_height;
+		}
+	}
+
+	if (page_cache->dual_even_left && !page_cache->uniform) {
+		if (!swap) {
+			saved_height = page_cache->size_cache [0].height;
+		} else {
+			saved_height = page_cache->size_cache [0].width;
+		}
+	} else {
+		saved_height = 0;
+	}
+	for (i = page_cache->dual_even_left; i < page_cache->n_pages + 2; i += 2) {
+    		if (page_cache->uniform) {
+			if (!swap) {
+				uniform_height = page_cache->uniform_height;
+			} else {
+				uniform_height = page_cache->uniform_width;
+			}
+			page_cache->dual_height_to_page [i] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
+			if (i + 1 < page_cache->n_pages + 2)
+				page_cache->dual_height_to_page [i + 1] = ((i + page_cache->dual_even_left) / 2) * uniform_height;
+		} else {
+			if (i + 1 < page_cache->n_pages) {
+				if (!swap) {
+					next_page_height = page_cache->size_cache [i + 1].height;
+				} else {
+					next_page_height = page_cache->size_cache [i + 1].width;
+				}
+			} else {
+				next_page_height = 0;
+			}
+			if (i < page_cache->n_pages) {
+				if (!swap) {
+					page_height = page_cache->size_cache [i].height;
+				} else {
+					page_height = page_cache->size_cache [i].width;
+				}
+			} else {
+				page_height = 0;
+			}
+			if (i + 1 < page_cache->n_pages + 2) {
+				page_cache->dual_height_to_page [i] = saved_height;
+				page_cache->dual_height_to_page [i + 1] = saved_height;
+				saved_height += MAX(page_height, next_page_height);
+			} else {
+				page_cache->dual_height_to_page [i] = saved_height;
+			}
+		}
+	}
+}
+
+EvPageCache *
+ev_page_cache_new (EvDocument *document)
+{
+	EvPageCache *page_cache;
+	EvPageCacheInfo *info;
+	EvPageThumbsInfo *thumb_info;
+	EvRenderContext *rc = NULL;
+	gboolean has_thumbs;
+	gint i;
+
+	page_cache = (EvPageCache *) g_object_new (EV_TYPE_PAGE_CACHE, NULL);
+
+	ev_document_doc_mutex_lock ();
+
+	/* We read page information out of the document */
+
+	/* Assume all pages are the same size until proven otherwise */
+	page_cache->uniform = TRUE;
+	page_cache->has_labels = FALSE;
+	page_cache->n_pages = ev_document_get_n_pages (document);
+	page_cache->dual_even_left = (page_cache->n_pages > 2);
+	page_cache->page_labels = g_new0 (char *, page_cache->n_pages);
+	page_cache->max_width = 0;
+	page_cache->max_height = 0;
+	page_cache->page_info = ev_document_get_info (document);
+	page_cache->thumbs_uniform = TRUE;
+
+	if (page_cache->page_info->fields_mask & EV_DOCUMENT_INFO_TITLE) {
+		page_cache->title = g_strdup (page_cache->page_info->title);
+	} else {
+		page_cache->title = NULL;
+	}
+
+	has_thumbs = EV_IS_DOCUMENT_THUMBNAILS (document);
+	
+	for (i = 0; i < page_cache->n_pages; i++) {
+		EvPage *page;
+		double  page_width = 0;
+		double  page_height = 0;
+		gint    thumb_width = 0;
+		gint    thumb_height = 0;
+
+		page = ev_document_get_page (document, i);
+		
+		ev_document_get_page_size (document, page, &page_width, &page_height);
+
+	    	page_cache->page_labels[i] = ev_document_get_page_label (document, page);
+		
+		if (page_cache->page_labels[i] != NULL) {
+		
+			page_cache->max_label_chars = MAX (page_cache->max_label_chars, 
+							   g_utf8_strlen (page_cache->page_labels[i], 256));
+			if (!page_cache->has_labels) {
+				gchar *expected_label;
+			
+				expected_label = g_strdup_printf ("%d", i + 1);
+				if (strcmp (expected_label, page_cache->page_labels[i]))  
+					page_cache->has_labels = TRUE;
+				g_free (expected_label);
+			}
+		}
+
+		if (page_width > page_cache->max_width) {
+			page_cache->max_width = page_width;
+		}
+
+		if (page_height > page_cache->max_height) {
+			page_cache->max_height = page_height;
+		}
+			
+		if (i == 0) {
+			page_cache->uniform_width = page_width;
+			page_cache->uniform_height = page_height;
+		} else if (page_cache->uniform &&
+			   (page_cache->uniform_width != page_width ||
+			    page_cache->uniform_height != page_height)) {
+			/* It's a different page size.  Backfill the array. */
+			int j;
+
+			page_cache->size_cache = g_new0 (EvPageCacheInfo, page_cache->n_pages);
+
+			for (j = 0; j < i; j++) {
+				info = &(page_cache->size_cache [j]);
+				info->width = page_cache->uniform_width;
+				info->height = page_cache->uniform_height;
+			}
+			page_cache->uniform = FALSE;
+
+		}
+
+		if (! page_cache->uniform) {
+			info = &(page_cache->size_cache [i]);
+
+			info->width = page_width;
+			info->height = page_height;
+		}
+
+		if (!has_thumbs) {
+			g_object_unref (page);
+			continue;
+		}
+
+		if (!rc) {
+			rc = ev_render_context_new (page, 0, (gdouble)THUMBNAIL_WIDTH / page_width);
+		} else {
+			ev_render_context_set_page (rc, page);
+			ev_render_context_set_scale (rc, (gdouble)THUMBNAIL_WIDTH / page_width);
+		}
+
+		ev_document_thumbnails_get_dimensions (EV_DOCUMENT_THUMBNAILS (document),
+						       rc, &thumb_width, &thumb_height);
+		
+		if (thumb_width > page_cache->thumbs_max_width) {
+			page_cache->thumbs_max_width = thumb_width;
+		}
+
+		if (thumb_height > page_cache->thumbs_max_height) {
+			page_cache->thumbs_max_height = thumb_height;
+		}
+			
+		if (i == 0) {
+			page_cache->thumbs_uniform_width = thumb_width;
+			page_cache->thumbs_uniform_height = thumb_height;
+		} else if (page_cache->thumbs_uniform &&
+			   (page_cache->thumbs_uniform_width != thumb_width ||
+			    page_cache->thumbs_uniform_height != thumb_height)) {
+			/* It's a different thumbnail size.  Backfill the array. */
+			int j;
+
+			page_cache->thumbs_size_cache = g_new0 (EvPageThumbsInfo, page_cache->n_pages);
+
+			for (j = 0; j < i; j++) {
+				thumb_info = &(page_cache->thumbs_size_cache [j]);
+				thumb_info->width = page_cache->thumbs_uniform_width;
+				thumb_info->height = page_cache->thumbs_uniform_height;
+			}
+			page_cache->thumbs_uniform = FALSE;
+		}
+
+		if (! page_cache->thumbs_uniform) {
+			thumb_info = &(page_cache->thumbs_size_cache [i]);
+
+			thumb_info->width = thumb_width;
+			thumb_info->height = thumb_height;
+		}
+
+		g_object_unref (page);
+	}
+
+	if (rc) {
+		g_object_unref (rc);
+	}
+
+	build_height_to_page (page_cache);
+
+	/* make some sanity check assertions */
+	if (! page_cache->uniform)
+		g_assert (page_cache->size_cache != NULL);
+	if (page_cache->uniform && page_cache->n_pages > 0)
+		g_assert (page_cache->uniform_width > 0 && page_cache->uniform_height > 0);
+
+	ev_document_doc_mutex_unlock ();
+
+	if (page_cache->n_pages > 0)
+		ev_page_cache_set_current_page (page_cache, 0);
+
+	return page_cache;
+}
+
+gint
+ev_page_cache_get_n_pages (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
+
+	return page_cache->n_pages;
+}
+
+gint
+ev_page_cache_get_current_page (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
+
+	return page_cache->current_page;
+}
+
+void
+ev_page_cache_set_current_page (EvPageCache *page_cache,
+				int          page)
+{
+	g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
+	g_return_if_fail (page >= 0 || page < page_cache->n_pages);
+
+	if (page == page_cache->current_page)
+		return;
+
+	page_cache->current_page = page;
+	g_signal_emit (page_cache, signals[PAGE_CHANGED], 0, page);
+}
+
+void
+ev_page_cache_set_current_page_history (EvPageCache *page_cache,
+					int          page)
+{
+	if (abs (page - page_cache->current_page) > 1)
+		g_signal_emit (page_cache, signals [HISTORY_CHANGED], 0, page);
+	
+	ev_page_cache_set_current_page (page_cache, page);
+}
+
+gboolean
+ev_page_cache_set_page_label (EvPageCache *page_cache,
+			      const char  *page_label)
+{
+	gint i, page;
+	long value;
+	char *endptr = NULL;
+	
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
+	g_return_val_if_fail (page_label != NULL, FALSE);
+
+	/* First, look for a literal label match */
+	for (i = 0; i < page_cache->n_pages; i ++) {
+		if (page_cache->page_labels[i] != NULL &&
+		    ! strcmp (page_label, page_cache->page_labels[i])) {
+			ev_page_cache_set_current_page (page_cache, i);
+			return TRUE;
+		}
+	}
+
+	/* Second, look for a match with case insensitively */
+	for (i = 0; i < page_cache->n_pages; i++) {
+		if (page_cache->page_labels[i] != NULL &&
+		    ! strcasecmp (page_label, page_cache->page_labels[i])) {
+			ev_page_cache_set_current_page (page_cache, i);
+			return TRUE;
+		}
+	}
+
+	/* Next, parse the label, and see if the number fits */
+	value = strtol (page_label, &endptr, 10);
+	if (endptr[0] == '\0') {
+		/* Page number is an integer */
+		page = MIN (G_MAXINT, value);
+
+		/* convert from a page label to a page offset */
+		page --;
+		if (page >= 0 &&
+		    page < page_cache->n_pages) {
+			ev_page_cache_set_current_page (page_cache, page);
+			return TRUE;
+		}
+	}
+
+	return FALSE;
+}
+
+const char *
+ev_page_cache_get_title (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
+
+	return page_cache->title;
+}
+
+void
+ev_page_cache_get_size (EvPageCache  *page_cache,
+			gint          page,
+			gint          rotation,
+			gfloat        scale,
+			gint         *width,
+			gint         *height)
+{
+	double w, h;
+
+	g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
+	g_return_if_fail (page >= 0 && page < page_cache->n_pages);
+
+	if (page_cache->uniform) {
+		w = page_cache->uniform_width;
+		h = page_cache->uniform_height;
+	} else {
+		EvPageCacheInfo *info;
+
+		info = &(page_cache->size_cache [page]);
+		
+		w = info->width;
+		h = info->height;
+	}
+
+	w = w * scale + 0.5;
+	h = h * scale + 0.5;
+
+	if (rotation == 0 || rotation == 180) {
+		if (width) *width = (int)w;
+		if (height) *height = (int)h;
+	} else {
+		if (width) *width = (int)h;
+		if (height) *height = (int)w;
+	}
+}
+
+void
+ev_page_cache_get_max_width (EvPageCache   *page_cache,
+			     gint	    rotation,
+			     gfloat         scale,
+			     gint          *width)
+{
+	g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
+
+	if (width) {
+		if (rotation == 0 || rotation == 180) {
+			*width = page_cache->max_width * scale;
+		} else {
+			*width = page_cache->max_height * scale;
+		}
+	}
+}
+
+void
+ev_page_cache_get_max_height (EvPageCache   *page_cache,
+			      gint           rotation,
+			      gfloat         scale,
+			      gint          *height)
+{
+	g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
+
+	if (height) {
+		if (rotation == 0 || rotation == 180) {
+			*height = page_cache->max_height * scale;
+		} else {
+			*height = page_cache->max_width * scale;
+		}
+	}
+}
+
+void    
+ev_page_cache_get_height_to_page (EvPageCache   *page_cache,
+				  gint           page,
+				  gint           rotation,
+				  gfloat         scale,
+				  gint          *height,
+				  gint 	        *dual_height)
+{
+	g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
+	g_return_if_fail (page >= 0);
+	g_return_if_fail (!height || page <= page_cache->n_pages);
+	g_return_if_fail (!dual_height || page <= page_cache->n_pages + 1);
+
+	if (page_cache->rotation != rotation) {
+		page_cache->rotation = rotation;
+		build_height_to_page (page_cache);
+	}
+	
+	if (height)
+		*height = page_cache->height_to_page [page] * scale;
+
+	if (dual_height)
+		*dual_height = page_cache->dual_height_to_page [page] * scale;
+}
+
+void
+ev_page_cache_get_thumbnail_size (EvPageCache  *page_cache,
+				  gint          page,
+				  gint          rotation,
+				  gint         *width,
+				  gint         *height)
+{
+	gint w, h;
+
+	g_return_if_fail (EV_IS_PAGE_CACHE (page_cache));
+	g_return_if_fail (page >= 0 && page < page_cache->n_pages);
+
+	if (page_cache->thumbs_uniform) {
+		w = page_cache->thumbs_uniform_width;
+		h = page_cache->thumbs_uniform_height;
+	} else {
+		EvPageThumbsInfo *info;
+
+		info = &(page_cache->thumbs_size_cache [page]);
+		
+		w = info->width;
+		h = info->height;
+	}
+
+	if (rotation == 0 || rotation == 180) {
+		if (width) *width = w;
+		if (height) *height = h;
+	} else {
+		if (width) *width = h;
+		if (height) *height = w;
+	}
+}
+
+gint
+ev_page_cache_get_max_label_chars (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
+	
+	return page_cache->max_label_chars;
+}
+
+gboolean
+ev_page_cache_get_dual_even_left (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), 0);
+	
+	return page_cache->dual_even_left;
+}
+
+gchar *
+ev_page_cache_get_page_label (EvPageCache *page_cache,
+			      gint         page)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
+	g_return_val_if_fail (page >= 0 && page < page_cache->n_pages, NULL);
+
+	if (page_cache->page_labels[page] == NULL)
+		return g_strdup_printf ("%d", page + 1);
+
+	return g_strdup (page_cache->page_labels[page]);
+}
+
+gboolean
+ev_page_cache_has_nonnumeric_page_labels (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), FALSE);
+	return page_cache->has_labels;
+}
+
+const EvDocumentInfo *
+ev_page_cache_get_info (EvPageCache *page_cache)
+{
+	g_return_val_if_fail (EV_IS_PAGE_CACHE (page_cache), NULL);
+
+	return page_cache->page_info;
+}
+
+#define PAGE_CACHE_STRING "ev-page-cache"
+
+EvPageCache *
+ev_page_cache_get (EvDocument *document)
+{
+	EvPageCache *page_cache;
+
+	g_return_val_if_fail (EV_IS_DOCUMENT (document), NULL);
+
+	page_cache = g_object_get_data (G_OBJECT (document), PAGE_CACHE_STRING);
+	if (page_cache == NULL) {
+		page_cache = ev_page_cache_new (document);
+		g_object_set_data_full (G_OBJECT (document), PAGE_CACHE_STRING, page_cache, g_object_unref);
+	}
+
+	return page_cache;
+}
--
cgit v0.9.1