Experimental implementation of sc_zoom

config.c

@@ -14,6 +14,10 @@ config_load_default(void)
   /* general settings */
   girara_mode_set(Zathura.UI.session, NORMAL);
 
+  /* zathura settings */
+  int int_value = 10;
+  girara_setting_add(Zathura.UI.session, "zoom-step", &int_value, INT, false, "Zoom step", NULL);
+
   /* define default shortcuts */
   girara_shortcut_add(Zathura.UI.session, GDK_CONTROL_MASK, GDK_c,          NULL, sc_abort,             0,                   0,               NULL);
   girara_shortcut_add(Zathura.UI.session, 0,                GDK_Escape,     NULL, sc_abort,             0,                   0,               NULL);

ft/document.c

@@ -103,8 +103,7 @@ zathura_document_open(const char* path, const char* password)
           }
 
           double offset = 0;
-          for (unsigned int page_id = 0; page_id < document->number_of_pages; page_id++)
-          {
+          for (unsigned int page_id = 0; page_id < document->number_of_pages; page_id++) {
             zathura_page_t* page = zathura_page_get(document, page_id);
             if (!page) {
               goto error_free;

render.c

@@ -174,3 +174,20 @@ render(zathura_page_t* page)
 
   return true;
 }
+
+void
+render_all(void)
+{
+  if (Zathura.document == NULL) {
+    return;
+  }
+
+  /* unmark all pages */
+  for (unsigned int page_id = 0; page_id < Zathura.document->number_of_pages; page_id++) {
+    Zathura.document->pages[page_id]->rendered = false;
+  }
+
+  /* redraw current page */
+  GtkAdjustment* view_vadjustment = gtk_scrolled_window_get_vadjustment(GTK_SCROLLED_WINDOW(Zathura.UI.session->gtk.view));
+  cb_view_vadjustment_value_changed(view_vadjustment, NULL);
+}

render.h

@@ -8,6 +8,7 @@
 #include <girara-datastructures.h>
 
 #include "ft/document.h"
+#include "callbacks.h"
 
 typedef struct render_thread_s
 {
@@ -41,4 +42,11 @@ void render_free(render_thread_t* render_thread);
  */
 bool render_page(render_thread_t* render_thread, zathura_page_t* page);
 
+/**
+ * This function is used to unmark all pages as not rendered. This should
+ * be used if all pages should be rendered again (e.g.: the zoom level or the
+ * colors have changed)
+ */
+void render_all(void);
+
 #endif // RENDER_H

shortcuts.c

@@ -6,6 +6,7 @@
 #include "callbacks.h"
 #include "shortcuts.h"
 #include "zathura.h"
+#include "render.h"
 
 bool
 sc_abort(girara_session_t* session, girara_argument_t* argument, unsigned int t)
@@ -244,5 +245,27 @@ sc_quit(girara_session_t* session, girara_argument_t* argument, unsigned int t)
 bool
 sc_zoom(girara_session_t* session, girara_argument_t* argument, unsigned int t)
 {
+  if (session == NULL || argument == NULL) {
+    return false;
+  }
+
+  /* retreive zoom step value */
+  int* value = girara_setting_get(Zathura.UI.session, "zoom-step");
+  if (value == NULL) {
+    return false;
+  }
+
+  float zoom_step = *value / 100.0f;
+
+  if (argument->n == ZOOM_IN) {
+    Zathura.document->scale += zoom_step;
+  } else if (argument->n == ZOOM_OUT) {
+    Zathura.document->scale -= zoom_step;
+  } else {
+    Zathura.document->scale = 1.0;
+  }
+
+  render_all();
+
   return false;
 }