webkit/common/cursors/webcursor_gtk.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 "webkit/common/cursors/webcursor.h"
   6
   7 #include <gdk/gdk.h>
   8 #include <gtk/gtk.h>
   9
  10 #include "base/logging.h"
  11 #include "third_party/WebKit/public/platform/WebCursorInfo.h"
  12 #include "ui/gfx/gtk_util.h"
  13
  14 using blink::WebCursorInfo;
  15
  16 namespace {
  17
  18 // webcursor_gtk_data.h is taken directly from WebKit's CursorGtk.h.
  19 #include "webkit/common/cursors/webcursor_gtk_data.h"
  20
  21 // This helper function is taken directly from WebKit's CursorGtk.cpp.
  22 // It attempts to create a custom cursor from the data inlined in
  23 // webcursor_gtk_data.h.
  24 GdkCursor* GetInlineCustomCursor(CustomCursorType type) {
  25   static GdkCursor* CustomCursorsGdk[G_N_ELEMENTS(CustomCursors)];
  26   GdkCursor* cursor = CustomCursorsGdk[type];
  27   if (cursor)
  28     return cursor;
  29   const CustomCursor& custom = CustomCursors[type];
  30   cursor = gdk_cursor_new_from_name(gdk_display_get_default(), custom.name);
  31   if (!cursor) {
  32     const GdkColor fg = { 0, 0, 0, 0 };
  33     const GdkColor bg = { 65535, 65535, 65535, 65535 };
  34     GdkPixmap* source = gdk_bitmap_create_from_data(
  35       NULL, reinterpret_cast<const gchar*>(custom.bits), 32, 32);
  36     GdkPixmap* mask = gdk_bitmap_create_from_data(
  37       NULL, reinterpret_cast<const gchar*>(custom.mask_bits), 32, 32);
  38     cursor = gdk_cursor_new_from_pixmap(source, mask, &fg, &bg,
  39                                         custom.hot_x, custom.hot_y);
  40     g_object_unref(source);
  41     g_object_unref(mask);
  42   }
  43   CustomCursorsGdk[type] = cursor;
  44   return cursor;
  45 }
  46
  47 }  // end anonymous namespace
  48
  49 int WebCursor::GetCursorType() const {
  50   // http://library.gnome.org/devel/gdk/2.12/gdk-Cursors.html has images
  51   // of the default X theme, but beware that the user's cursor theme can
  52   // change everything.
  53   switch (type_) {
  54     case WebCursorInfo::TypePointer:
  55       return GDK_LAST_CURSOR;
  56     case WebCursorInfo::TypeCross:
  57       return GDK_CROSS;
  58     case WebCursorInfo::TypeHand:
  59       return GDK_HAND2;
  60     case WebCursorInfo::TypeIBeam:
  61       return GDK_XTERM;
  62     case WebCursorInfo::TypeWait:
  63       return GDK_WATCH;
  64     case WebCursorInfo::TypeHelp:
  65       return GDK_QUESTION_ARROW;
  66     case WebCursorInfo::TypeEastResize:
  67       return GDK_RIGHT_SIDE;
  68     case WebCursorInfo::TypeNorthResize:
  69       return GDK_TOP_SIDE;
  70     case WebCursorInfo::TypeNorthEastResize:
  71       return GDK_TOP_RIGHT_CORNER;
  72     case WebCursorInfo::TypeNorthWestResize:
  73       return GDK_TOP_LEFT_CORNER;
  74     case WebCursorInfo::TypeSouthResize:
  75       return GDK_BOTTOM_SIDE;
  76     case WebCursorInfo::TypeSouthEastResize:
  77       return GDK_BOTTOM_RIGHT_CORNER;
  78     case WebCursorInfo::TypeSouthWestResize:
  79       return GDK_BOTTOM_LEFT_CORNER;
  80     case WebCursorInfo::TypeWestResize:
  81       return GDK_LEFT_SIDE;
  82     case WebCursorInfo::TypeNorthSouthResize:
  83       return GDK_SB_V_DOUBLE_ARROW;
  84     case WebCursorInfo::TypeEastWestResize:
  85       return GDK_SB_H_DOUBLE_ARROW;
  86     case WebCursorInfo::TypeNorthEastSouthWestResize:
  87     case WebCursorInfo::TypeNorthWestSouthEastResize:
  88       // There isn't really a useful cursor available for these.
  89       return GDK_LAST_CURSOR;
  90     case WebCursorInfo::TypeColumnResize:
  91       return GDK_SB_H_DOUBLE_ARROW;  // TODO(evanm): is this correct?
  92     case WebCursorInfo::TypeRowResize:
  93       return GDK_SB_V_DOUBLE_ARROW;  // TODO(evanm): is this correct?
  94     case WebCursorInfo::TypeMiddlePanning:
  95       return GDK_FLEUR;
  96     case WebCursorInfo::TypeEastPanning:
  97       return GDK_SB_RIGHT_ARROW;
  98     case WebCursorInfo::TypeNorthPanning:
  99       return GDK_SB_UP_ARROW;
 100     case WebCursorInfo::TypeNorthEastPanning:
 101       return GDK_TOP_RIGHT_CORNER;
 102     case WebCursorInfo::TypeNorthWestPanning:
 103       return GDK_TOP_LEFT_CORNER;
 104     case WebCursorInfo::TypeSouthPanning:
 105       return GDK_SB_DOWN_ARROW;
 106     case WebCursorInfo::TypeSouthEastPanning:
 107       return GDK_BOTTOM_RIGHT_CORNER;
 108     case WebCursorInfo::TypeSouthWestPanning:
 109       return GDK_BOTTOM_LEFT_CORNER;
 110     case WebCursorInfo::TypeWestPanning:
 111       return GDK_SB_LEFT_ARROW;
 112     case WebCursorInfo::TypeMove:
 113       return GDK_FLEUR;
 114     case WebCursorInfo::TypeVerticalText:
 115       return GDK_LAST_CURSOR;
 116     case WebCursorInfo::TypeCell:
 117       return GDK_LAST_CURSOR;
 118     case WebCursorInfo::TypeContextMenu:
 119       return GDK_LAST_CURSOR;
 120     case WebCursorInfo::TypeAlias:
 121       return GDK_LAST_CURSOR;
 122     case WebCursorInfo::TypeProgress:
 123       return GDK_WATCH;
 124     case WebCursorInfo::TypeNoDrop:
 125       return GDK_LAST_CURSOR;
 126     case WebCursorInfo::TypeCopy:
 127       return GDK_LAST_CURSOR;
 128     case WebCursorInfo::TypeNone:
 129       return GDK_BLANK_CURSOR;
 130     case WebCursorInfo::TypeNotAllowed:
 131       return GDK_LAST_CURSOR;
 132     case WebCursorInfo::TypeZoomIn:
 133     case WebCursorInfo::TypeZoomOut:
 134     case WebCursorInfo::TypeGrab:
 135     case WebCursorInfo::TypeGrabbing:
 136     case WebCursorInfo::TypeCustom:
 137       return GDK_CURSOR_IS_PIXMAP;
 138   }
 139   NOTREACHED();
 140   return GDK_LAST_CURSOR;
 141 }
 142
 143 gfx::NativeCursor WebCursor::GetNativeCursor() {
 144   int type = GetCursorType();
 145   if (type == GDK_CURSOR_IS_PIXMAP)
 146     return GetCustomCursor();
 147   return gfx::GetCursor(type);
 148 }
 149
 150 GdkCursor* WebCursor::GetCustomCursor() {
 151   switch (type_) {
 152     case WebCursorInfo::TypeZoomIn:
 153       return GetInlineCustomCursor(CustomCursorZoomIn);
 154     case WebCursorInfo::TypeZoomOut:
 155       return GetInlineCustomCursor(CustomCursorZoomOut);
 156     case WebCursorInfo::TypeGrab:
 157       return GetInlineCustomCursor(CustomCursorGrab);
 158     case WebCursorInfo::TypeGrabbing:
 159       return GetInlineCustomCursor(CustomCursorGrabbing);
 160   }
 161
 162   if (type_ != WebCursorInfo::TypeCustom) {
 163     NOTREACHED();
 164     return NULL;
 165   }
 166
 167   if (custom_size_.width() == 0 || custom_size_.height() == 0) {
 168     // Some websites specify cursor images that are 0 sized, such as Bing Maps.
 169     // Don't crash on this; just use the default cursor.
 170     return NULL;
 171   }
 172
 173   SkBitmap bitmap;
 174   bitmap.setConfig(SkBitmap::kARGB_8888_Config,
 175                    custom_size_.width(), custom_size_.height());
 176   bitmap.allocPixels();
 177   memcpy(bitmap.getAddr32(0, 0), custom_data_.data(), custom_data_.size());
 178
 179   GdkPixbuf* pixbuf = gfx::GdkPixbufFromSkBitmap(bitmap);
 180   GdkCursor* cursor = gdk_cursor_new_from_pixbuf(gdk_display_get_default(),
 181                                                  pixbuf,
 182                                                  hotspot_.x(),
 183                                                  hotspot_.y());
 184
 185   g_object_unref(pixbuf);
 186
 187   if (unref_)
 188     gdk_cursor_unref(unref_);
 189   unref_ = cursor;
 190   return cursor;
 191 }
 192
 193 void WebCursor::InitPlatformData() {
 194   unref_ = NULL;
 195   return;
 196 }
 197
 198 bool WebCursor::SerializePlatformData(Pickle* pickle) const {
 199   return true;
 200 }
 201
 202 bool WebCursor::DeserializePlatformData(PickleIterator* iter) {
 203   return true;
 204 }
 205
 206 bool WebCursor::IsPlatformDataEqual(const WebCursor& other) const {
 207   return true;
 208 }
 209
 210 void WebCursor::CleanupPlatformData() {
 211   if (unref_) {
 212     gdk_cursor_unref(unref_);
 213     unref_ = NULL;
 214   }
 215   return;
 216 }
 217
 218 void WebCursor::CopyPlatformData(const WebCursor& other) {
 219   if (other.unref_)
 220     unref_ = gdk_cursor_ref(other.unref_);
 221   return;
 222 }