cikada-0.1---一款linux 平臺閱讀器移植記錄

由於要在一款嵌入式平臺上移植一款pdf閱讀器,所以在網上想找找有沒有開源的,然後找來研究研究,所以遇到cikada.

由於cikada所用的clutter版本比較高,而我現在用的纔是clutter-1.0.

而且我是用命令行編譯的,用它自帶的編譯方法編譯不通過.

所以有以下幾個地方要修改:

一.在cikada.c文件中:

以下代碼要註釋掉:

bindtextdomain (PACKAGE, LOCALEDIR);
bind_textdomain_codeset (PACKAGE, "UTF-8");
textdomain (PACKAGE);
        
context = g_option_context_new (_("- Cikada is a presentation tool for PDF slides"));
g_option_context_add_main_entries (context, _ckd_entries, PACKAGE);

if (!g_option_context_parse (context, &argc, &argv, NULL))
    return -1;
if (argv[1] == NULL) {
    g_print (_("You should input PDF file name!\n"));
    return -1;
}

二.在ckd-page.c中,

修改以下幾處:

1.將static gboolean ckd_page_render (ClutterCairoTexture *actor, cairo_t *cr, gpointer user_data)函數刪除. 相應的,將static void ckd_page_set_property (GObject *obj, guint prop_id, const GValue *value, GParamSpec *pspec)函數中的g_signal_connect (priv->cairo_texture, "draw", G_CALLBACK (ckd_page_render), self);這一句刪除

因爲在clutter-1.0中,clutter_cairo_texture還沒有draw信號.

2.在static void ckd_page_set_property (GObject *obj, guint prop_id, const GValue *value, GParamSpec *pspec)函數中,case PROP_PDF_PAGE: 代碼塊中,有w, h只定義,但沒有取得數據,而且在priv->cairo_texture = clutter_cairo_texture_new (priv->quality * w, priv->quality * h);中就使用了.此處存疑.
作以下修改:

在priv->cairo_texture = clutter_cairo_texture_new (w, h);語句前,添加

w = priv->pdf_width;
h = priv->pdf_height;

3.在static void ckd_page_paint (ClutterActor *actor)中,在clutter_actor_paint (priv->cairo_texture);這條語句後面添加以下代碼:

guint w, h;
clutter_cairo_texture_clear ( CLUTTER_CAIRO_TEXTURE (priv->cairo_texture));
cairo_t *cr = clutter_cairo_texture_create (CLUTTER_CAIRO_TEXTURE (priv->cairo_texture));
w = priv->pdf_width * priv->quality;
h = priv->pdf_height * priv->quality;
cairo_rectangle (cr, 0, 0, w, h);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 1.0);
cairo_fill (cr);
cairo_scale (cr, priv->quality, priv->quality);
poppler_page_render (priv->pdf_page, cr);
cairo_destroy(cr);

4.爲了讓cairo_texture自繪,要實現actor_class的map和unmap函數.故在ckd-page.c文件中添加以下兩個函數實現:

static void
ckd_page_map (ClutterActor *actor)
{
	g_debug ("Enter ckd_page_map.");
	CkdPagePriv *priv = CKD_PAGE_GET_PRIVATE (actor);

	CLUTTER_ACTOR_CLASS (ckd_page_parent_class)->map(actor);

	if (CLUTTER_IS_ACTOR (priv->cairo_texture))
		clutter_actor_map (priv->cairo_texture);
}

static void
ckd_page_unmap (ClutterActor *actor)
{
	g_debug ("Enter ckd_page_unmap.");
	CkdPagePriv *priv = CKD_PAGE_GET_PRIVATE (actor);

	if (CLUTTER_IS_ACTOR (priv->cairo_texture))
		clutter_actor_unmap (priv->cairo_texture);

	CLUTTER_ACTOR_CLASS (ckd_page_parent_class)->unmap(actor);
}

5.在static void ckd_page_class_init (CkdPageClass *klass)函數中,map和unmap函數指針賦於它它的父類虛函數.

故在actor_class->allocate = ckd_page_allocate;語句後面添加以下兩句:

actor_class->map = ckd_page_map;
actor_class->unmap = ckd_page_unmap;

作如上修改後,就可以使用命令行編譯運行了:

gcc ckd-page.c ckd-slides.c ckd-page-fade.c ckd-page-manager.c cikada.c -o cikada `pkg-config --cflags --libs clutter-1.0 poppler-glib`

致謝:http://garfileo.is-programmer.com/tag/clutter

原作者的代碼也可以此網站上找到下載鏈接.

如有疑問聯繫:[email protected]