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      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 }
    223