chrome/browser/ui/gtk/titlebar_throb_animation.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/gtk/titlebar_throb_animation.h"
   6 #include "grit/theme_resources.h"
   7 #include "third_party/skia/include/core/SkBitmap.h"
   8 #include "ui/base/resource/resource_bundle.h"
   9 #include "ui/gfx/skbitmap_operations.h"
  10
  11 namespace {
  12
  13 // We don't bother to clean up these or the pixbufs they contain when we exit.
  14 std::vector<GdkPixbuf*>* g_throbber_frames = NULL;
  15 std::vector<GdkPixbuf*>* g_throbber_waiting_frames = NULL;
  16
  17 // Load |resource_id| from the ResourceBundle and split it into a series of
  18 // square GdkPixbufs that get stored in |frames|.
  19 void MakeThrobberFrames(int resource_id, std::vector<GdkPixbuf*>* frames) {
  20   ui::ResourceBundle &rb = ui::ResourceBundle::GetSharedInstance();
  21   SkBitmap frame_strip = rb.GetImageNamed(resource_id).AsBitmap();
  22
  23   // Each frame of the animation is a square, so we use the height as the
  24   // frame size.
  25   int frame_size = frame_strip.height();
  26   size_t num_frames = frame_strip.width() / frame_size;
  27
  28   // Make a separate GdkPixbuf for each frame of the animation.
  29   for (size_t i = 0; i < num_frames; ++i) {
  30     SkBitmap frame = SkBitmapOperations::CreateTiledBitmap(frame_strip,
  31         i * frame_size, 0, frame_size, frame_size);
  32     frames->push_back(gfx::GdkPixbufFromSkBitmap(frame));
  33   }
  34 }
  35
  36 }  // namespace
  37
  38 // TODO(tc): Handle anti-clockwise spinning when waiting for a connection.
  39
  40 TitlebarThrobAnimation::TitlebarThrobAnimation()
  41     : current_frame_(0),
  42       current_waiting_frame_(0) {
  43 }
  44
  45 GdkPixbuf* TitlebarThrobAnimation::GetNextFrame(bool is_waiting) {
  46   InitFrames();
  47   if (is_waiting) {
  48     return (*g_throbber_waiting_frames)[current_waiting_frame_++ %
  49         g_throbber_waiting_frames->size()];
  50   } else {
  51     return (*g_throbber_frames)[current_frame_++ % g_throbber_frames->size()];
  52   }
  53 }
  54
  55 void TitlebarThrobAnimation::Reset() {
  56   current_frame_ = 0;
  57   current_waiting_frame_ = 0;
  58 }
  59
  60 // static
  61 void TitlebarThrobAnimation::InitFrames() {
  62   if (g_throbber_frames)
  63     return;
  64
  65   // We load the light version of the throbber since it'll be in the titlebar.
  66   g_throbber_frames = new std::vector<GdkPixbuf*>;
  67   MakeThrobberFrames(IDR_THROBBER_LIGHT, g_throbber_frames);
  68
  69   g_throbber_waiting_frames = new std::vector<GdkPixbuf*>;
  70   MakeThrobberFrames(IDR_THROBBER_WAITING_LIGHT, g_throbber_waiting_frames);
  71 }