I found another problem is after adding "enable-accelerated-compositing"
flag,
some pages show abnormally.
For example, "http://lab.cubiq.org/iscroll/examples/simple/";, the page will
shows it,
immediately after that, the whole page will turn gray..
On Wed, Apr 24, 2013 at 3:53 PM, Jianhua Shao <alex....@gmail.com> wrote:
> After I replace the following:
>
> GdkPixbuf * pixbuf;
> pixbuf = gdk_pixbuf_get_from_drawable( NULL, GTK_WIDGET(view)->window,
> rgba, 0, 0, 0, 0, 600, 400 );
> gdk_pixbuf_save(pixbuf, "/home/meego/dump.png", "png", NULL, NULL);
> with:
> cairo_surface_t* surface = webkit_web_view_get_snapshot(view);
> cairo_surface_write_to_png(surface, "/home/meego/dump.png");
>
> I got a transparent dump.png...
> I am confused, maybe I need to configure some thing in gtk side to achieve
> the transparent effect?
>
>
> On Wed, Apr 24, 2013 at 3:32 PM, Jianhua Shao <alex....@gmail.com> wrote:
>
>>
>> I build webkitgtk 1.9.92 by below configuration
>> ./configure --prefix=/usr --enable-accelerated-compositing
>> --enable-fast-mobile-scrolling --enable-jit --disable-webkit2
>> --disable-plugin-process --disable-gtk-doc-html --with-gtk=2.0
>> --with-acceleration-backend=opengl
>>
>> After that, I write a simple app to make the content of webview
>> transparent by calling webkit_web_view_set_transparent(). But it failed.
>> I tryied version 1.11.5, it also does not work.
>> The same app source code works in a old version of gtk-webkit, AFAIK, it
>> was about gtk-webkit 1.3.
>>
>> Why I want to a build a new version of gtk-webkit, is to use the
>> compositing accelerating feature.
>>
>> Anyone know something about this problem?
>>
>> The test code is here:
>> -----------app code---------
>> #include <gtk/gtk.h>
>> #include <gdk/gdkx.h>
>> #include <webkit/webkit.h>
>> #include <stdlib.h>
>> #include <string.h>
>> static void destroy_cb(GtkWidget* widget, gpointer data) {
>> gtk_main_quit();
>> }
>>
>> bool transparent = true;
>> bool decorate = false;
>> int width = 800;
>> int height = 480;
>> gchar * url = "/home/meego/httproot/htdocs/hmi/hmi/index.html";
>> char *window_name = "HMI";
>> WebKitWebView* view;
>> GdkColormap* rgba;
>> GdkScreen* screen;
>>
>> gint key_press_cb(GtkWidget *widget, GdkEventKey *kevent, gpointer data)
>> {
>> GtkWidget *btn = (GtkWidget *)data;
>>
>> if(kevent->type == GDK_KEY_PRESS && kevent->keyval == 'p') {
>>
>> GdkPixbuf * pixbuf;
>> pixbuf = gdk_pixbuf_get_from_drawable( NULL,
>> GTK_WIDGET(view)->window, rgba, 0, 0, 0, 0, 600, 400 );
>> gdk_pixbuf_save(pixbuf, "/home/meego/dump.png", "png", NULL,
>> NULL);
>> printf("colormap is %s\n", rgba ? "not NULL" : "NULL");
>> printf("screen %s compoisted\n",
>> gdk_screen_is_composited(screen)? "is" : "is not");
>> printf("webview %s transparent\n",
>> webkit_web_view_get_transparent(view) ? "is" : "is not");
>> }
>> return TRUE;
>> }
>>
>> static gboolean window_delete_event(GtkWidget *widget, GdkEvent *event,
>> gpointer user_data)
>> {
>> gtk_widget_destroy(widget);
>> gtk_main_quit();
>> return TRUE;
>> }
>>
>> int main(int argc, char* argv[]) {
>> int ret;
>>
>> if(argc >= 2) {
>> url = argv[1];
>> }
>> gtk_init(&argc, &argv);
>>
>> // Create a Window, set colormap to RGBA
>> GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
>> screen = gtk_widget_get_screen(window);
>> rgba = gdk_screen_get_rgba_colormap (screen);
>>
>> gtk_window_set_title(GTK_WINDOW(window), (const gchar*)window_name);
>> if (rgba && gdk_screen_is_composited (screen)) {
>> gtk_widget_set_default_colormap(rgba);
>> gtk_widget_set_colormap(GTK_WIDGET(window), rgba);
>> }
>>
>> gtk_widget_set_size_request(window, width, height);
>>
>> if(!decorate)
>> {
>> gtk_window_set_decorated(GTK_WINDOW(window), FALSE);
>> }
>>
>> view = WEBKIT_WEB_VIEW(webkit_web_view_new());
>> gtk_widget_set_colormap(GTK_WIDGET(view), rgba);
>> if(transparent) {
>> if(gdk_screen_is_composited(screen)) {
>> printf("set transparent\n");
>> webkit_web_view_set_transparent(view, TRUE);
>> }
>> }
>>
>> WebKitWebSettings *settings = webkit_web_settings_new();
>>
>> if(NULL == settings) {
>> return -1;
>> } else {
>> g_object_set (G_OBJECT(settings),
>> "enable-file-access-from-file-uris", TRUE, NULL);
>> g_object_set (G_OBJECT(settings), "enable-default-context-menu",
>> FALSE, NULL);
>> webkit_web_view_set_settings (WEBKIT_WEB_VIEW(view), settings);
>> }
>> gtk_container_add (GTK_CONTAINER(window), GTK_WIDGET(view));
>>
>>
>> g_signal_connect(window, "delete-event",
>> G_CALLBACK(window_delete_event), NULL);
>> g_signal_connect(window, "destroy", G_CALLBACK(destroy_cb), NULL);
>>
>> g_signal_connect(G_OBJECT(window), "key_press_event",
>> G_CALLBACK(key_press_cb), window);
>> //g_signal_emit_by_name(G_OBJECT(window), "activate", NULL);
>>
>> // Load a default page
>> if (g_str_has_prefix(url, "http://";)
>> || g_str_has_prefix(url, "https://";)
>> || g_str_has_prefix(url, "file://"))
>> {
>> webkit_web_view_open(WEBKIT_WEB_VIEW(view), url);
>> } else {
>> gchar *t_url = NULL;
>> if (g_path_is_absolute(url)) {
>> t_url = g_strjoin("", "file://", url, NULL);
>> } else {
>> gchar *pwd = g_get_current_dir();
>> t_url = g_strjoin("/", "file://", pwd, url, NULL);
>> g_free(pwd);
>> }
>> webkit_web_view_open(WEBKIT_WEB_VIEW(view), t_url);
>> g_free(t_url);
>> }
>>
>> gtk_widget_show_all(window);
>> gtk_main();
>> return 0;
>> }
>>
>>
>> -----------html code-----------
>> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "
>> http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
>> <html xmlns="http://www.w3.org/1999/xhtml";><head>
>> <meta http-equiv="content-type" content="text/html; charset=UTF-8">
>> <title>Transparency Test</title>
>> <style type="text/css">
>> /*<![CDATA[*/
>> body { background: rgba(220, 220, 0, .5); }
>> /*]]>*/
>> </style>
>> </head>
>> <body>
>> <p>
>> Text on a yellowish, semi-transparent background.
>> </p>
>>
>>
>> </body></html>
>>
>>
>>
>>
>>
>>
>
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