src/gtk/cursor.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/cursor.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #include "wx/cursor.h"
  14
  15 #ifndef WX_PRECOMP
  16     #include "wx/app.h"
  17     #include "wx/utils.h"
  18     #include "wx/image.h"
  19     #include "wx/colour.h"
  20 #endif // WX_PRECOMP
  21
  22 #include <gtk/gtk.h>
  23
  24 //-----------------------------------------------------------------------------
  25 // wxCursor
  26 //-----------------------------------------------------------------------------
  27
  28 class wxCursorRefData: public wxObjectRefData
  29 {
  30   public:
  31
  32     wxCursorRefData();
  33     virtual ~wxCursorRefData();
  34
  35     GdkCursor *m_cursor;
  36 };
  37
  38 wxCursorRefData::wxCursorRefData()
  39 {
  40     m_cursor = (GdkCursor *) NULL;
  41 }
  42
  43 wxCursorRefData::~wxCursorRefData()
  44 {
  45     if (m_cursor) gdk_cursor_unref( m_cursor );
  46 }
  47
  48 //-----------------------------------------------------------------------------
  49
  50 #define M_CURSORDATA ((wxCursorRefData *)m_refData)
  51
  52 IMPLEMENT_DYNAMIC_CLASS(wxCursor,wxObject)
  53
  54 wxCursor::wxCursor()
  55 {
  56
  57 }
  58
  59 wxCursor::wxCursor( int cursorId )
  60 {
  61     m_refData = new wxCursorRefData();
  62
  63     GdkCursorType gdk_cur = GDK_LEFT_PTR;
  64     switch (cursorId)
  65     {
  66         case wxCURSOR_BLANK:
  67             {
  68                 static const gchar bits[] = { 0 };
  69                 static /* const -- not in GTK1 */ GdkColor color = { 0, 0, 0, 0 };
  70
  71                 GdkPixmap *pixmap = gdk_bitmap_create_from_data(NULL, bits, 1, 1);
  72                 M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(pixmap,
  73                                                                     pixmap,
  74                                                                     &color,
  75                                                                     &color,
  76                                                                     0, 0);
  77             }
  78             return;
  79
  80         case wxCURSOR_ARROW:            // fall through to default
  81         case wxCURSOR_DEFAULT:          gdk_cur = GDK_LEFT_PTR; break;
  82         case wxCURSOR_RIGHT_ARROW:      gdk_cur = GDK_RIGHT_PTR; break;
  83         case wxCURSOR_HAND:             gdk_cur = GDK_HAND1; break;
  84         case wxCURSOR_CROSS:            gdk_cur = GDK_CROSSHAIR; break;
  85         case wxCURSOR_SIZEWE:           gdk_cur = GDK_SB_H_DOUBLE_ARROW; break;
  86         case wxCURSOR_SIZENS:           gdk_cur = GDK_SB_V_DOUBLE_ARROW; break;
  87         case wxCURSOR_ARROWWAIT:
  88         case wxCURSOR_WAIT:
  89         case wxCURSOR_WATCH:            gdk_cur = GDK_WATCH; break;
  90         case wxCURSOR_SIZING:           gdk_cur = GDK_SIZING; break;
  91         case wxCURSOR_SPRAYCAN:         gdk_cur = GDK_SPRAYCAN; break;
  92         case wxCURSOR_IBEAM:            gdk_cur = GDK_XTERM; break;
  93         case wxCURSOR_PENCIL:           gdk_cur = GDK_PENCIL; break;
  94         case wxCURSOR_NO_ENTRY:         gdk_cur = GDK_PIRATE; break;
  95         case wxCURSOR_SIZENWSE:
  96         case wxCURSOR_SIZENESW:         gdk_cur = GDK_FLEUR; break;
  97         case wxCURSOR_QUESTION_ARROW:   gdk_cur = GDK_QUESTION_ARROW; break;
  98         case wxCURSOR_PAINT_BRUSH:      gdk_cur = GDK_SPRAYCAN; break;
  99         case wxCURSOR_MAGNIFIER:        gdk_cur = GDK_PLUS; break;
 100         case wxCURSOR_CHAR:             gdk_cur = GDK_XTERM; break;
 101         case wxCURSOR_LEFT_BUTTON:      gdk_cur = GDK_LEFTBUTTON; break;
 102         case wxCURSOR_MIDDLE_BUTTON:    gdk_cur = GDK_MIDDLEBUTTON; break;
 103         case wxCURSOR_RIGHT_BUTTON:     gdk_cur = GDK_RIGHTBUTTON; break;
 104         case wxCURSOR_BULLSEYE:         gdk_cur = GDK_TARGET; break;
 105
 106         case wxCURSOR_POINT_LEFT:       gdk_cur = GDK_SB_LEFT_ARROW; break;
 107         case wxCURSOR_POINT_RIGHT:      gdk_cur = GDK_SB_RIGHT_ARROW; break;
 108 /*
 109         case wxCURSOR_DOUBLE_ARROW:     gdk_cur = GDK_DOUBLE_ARROW; break;
 110         case wxCURSOR_CROSS_REVERSE:    gdk_cur = GDK_CROSS_REVERSE; break;
 111         case wxCURSOR_BASED_ARROW_UP:   gdk_cur = GDK_BASED_ARROW_UP; break;
 112         case wxCURSOR_BASED_ARROW_DOWN: gdk_cur = GDK_BASED_ARROW_DOWN; break;
 113 */
 114
 115         default:
 116             wxFAIL_MSG(wxT("unsupported cursor type"));
 117             // will use the standard one
 118             break;
 119     }
 120
 121     M_CURSORDATA->m_cursor = gdk_cursor_new( gdk_cur );
 122 }
 123
 124 extern GtkWidget *wxGetRootWindow();
 125
 126 wxCursor::wxCursor(const char bits[], int width, int  height,
 127                    int hotSpotX, int hotSpotY,
 128                    const char maskBits[], const wxColour *fg, const wxColour *bg)
 129 {
 130     if (!maskBits)
 131         maskBits = bits;
 132     if (!fg)
 133         fg = wxBLACK;
 134     if (!bg)
 135         bg = wxWHITE;
 136     if (hotSpotX < 0 || hotSpotX >= width)
 137         hotSpotX = 0;
 138     if (hotSpotY < 0 || hotSpotY >= height)
 139         hotSpotY = 0;
 140
 141     GdkBitmap *data = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) bits, width, height );
 142     GdkBitmap *mask = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) maskBits, width, height);
 143
 144     m_refData = new wxCursorRefData;
 145     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(
 146                  data, mask, fg->GetColor(), bg->GetColor(),
 147                  hotSpotX, hotSpotY );
 148
 149     g_object_unref (data);
 150     g_object_unref (mask);
 151 }
 152
 153 #if wxUSE_IMAGE
 154
 155 static void GetHotSpot(const wxImage& image, int& x, int& y)
 156 {
 157     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X))
 158         x = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X);
 159     else
 160         x = 0;
 161
 162     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y))
 163         y = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y);
 164     else
 165         y = 0;
 166
 167     if (x < 0 || x >= image.GetWidth())
 168         x = 0;
 169     if (y < 0 || y >= image.GetHeight())
 170         y = 0;
 171 }
 172
 173 wxCursor::wxCursor( const wxImage & image )
 174 {
 175     unsigned char * rgbBits = image.GetData();
 176     int w = image.GetWidth() ;
 177     int h = image.GetHeight();
 178     bool bHasMask = image.HasMask();
 179     int imagebitcount = (w*h)/8;
 180
 181     if ( gdk_display_supports_cursor_color(gdk_display_get_default()) )
 182     {
 183         unsigned char rMask = 0,
 184                       gMask = 0,
 185                       bMask = 0;
 186         if (bHasMask)
 187         {
 188             rMask = image.GetMaskRed();
 189             gMask = image.GetMaskGreen();
 190             bMask = image.GetMaskBlue();
 191         }
 192
 193         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8, w, h);
 194         unsigned char *alpha = image.HasAlpha() ? image.GetAlpha() : NULL;
 195         unsigned char *out = gdk_pixbuf_get_pixels(pixbuf);
 196         int rowpad = gdk_pixbuf_get_rowstride(pixbuf) - 4 * w;
 197         for ( int y = 0; y < h; y++, out += rowpad )
 198         {
 199             for ( int x = 0; x < w; x++, out += 4, rgbBits += 3 )
 200             {
 201                 out[0] = rgbBits[0];
 202                 out[1] = rgbBits[1];
 203                 out[2] = rgbBits[2];
 204                 if (bHasMask &&
 205                     out[0] == rMask && out[1] == gMask && out[2] == bMask)
 206                     out[3] = 0;
 207                 else
 208                     out[3] = alpha ? *alpha : 255;
 209                 if ( alpha )
 210                     ++alpha;
 211             }
 212         }
 213
 214         int hotSpotX, hotSpotY;
 215         GetHotSpot(image, hotSpotX, hotSpotY);
 216
 217         m_refData = new wxCursorRefData;
 218         M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixbuf
 219                              (
 220                               gdk_display_get_default(),
 221                               pixbuf,
 222                               hotSpotX, hotSpotY
 223                              );
 224         g_object_unref (pixbuf);
 225         return;
 226     }
 227
 228     unsigned char * bits = new unsigned char [imagebitcount];
 229     unsigned char * maskBits = new unsigned char [imagebitcount];
 230
 231     int i, j, i8; unsigned char c, cMask;
 232     for (i=0; i<imagebitcount; i++)
 233     {
 234         bits[i] = 0;
 235         i8 = i * 8;
 236
 237         cMask = 1;
 238         for (j=0; j<8; j++)
 239         {
 240             // possible overflow if we do the summation first ?
 241             c = rgbBits[(i8+j)*3]/3 + rgbBits[(i8+j)*3+1]/3 + rgbBits[(i8+j)*3+2]/3;
 242             //if average value is > mid grey
 243             if (c>127)
 244                 bits[i] = bits[i] | cMask;
 245             cMask = cMask * 2;
 246         }
 247     }
 248
 249     unsigned long keyMaskColor;
 250     if (bHasMask)
 251     {
 252         unsigned char
 253             r = image.GetMaskRed(),
 254             g = image.GetMaskGreen(),
 255             b = image.GetMaskBlue();
 256
 257         for (i=0; i<imagebitcount; i++)
 258         {
 259             maskBits[i] = 0x0;
 260             i8 = i * 8;
 261
 262             cMask = 1;
 263             for (j=0; j<8; j++)
 264             {
 265                 if (rgbBits[(i8+j)*3] != r || rgbBits[(i8+j)*3+1] != g || rgbBits[(i8+j)*3+2] != b)
 266                     maskBits[i] = maskBits[i] | cMask;
 267                 cMask = cMask * 2;
 268             }
 269         }
 270
 271         keyMaskColor = (r << 16) | (g << 8) | b;
 272     }
 273     else // no mask
 274     {
 275         for (i=0; i<imagebitcount; i++)
 276             maskBits[i] = 0xFF;
 277
 278         // init it to avoid compiler warnings
 279         keyMaskColor = 0;
 280     }
 281
 282     // find the most frequent color(s)
 283     wxImageHistogram histogram;
 284     image.ComputeHistogram(histogram);
 285
 286     // colors as rrggbb
 287     unsigned long key;
 288     unsigned long value;
 289
 290     long colMostFreq = 0;
 291     unsigned long nMost = 0;
 292     long colNextMostFreq = 0;
 293     unsigned long nNext = 0;
 294     for ( wxImageHistogram::iterator entry = histogram.begin();
 295           entry != histogram.end();
 296           ++entry )
 297     {
 298         value = entry->second.value;
 299         key = entry->first;
 300         if ( !bHasMask || (key != keyMaskColor) )
 301         {
 302             if (value > nMost)
 303             {
 304                 nMost = value;
 305                 colMostFreq = key;
 306             }
 307             else if (value > nNext)
 308             {
 309                 nNext = value;
 310                 colNextMostFreq = key;
 311             }
 312         }
 313     }
 314
 315     wxColour fg = wxColour ( (unsigned char)(colMostFreq >> 16),
 316                              (unsigned char)(colMostFreq >> 8),
 317                              (unsigned char)(colMostFreq) );
 318
 319     wxColour bg = wxColour ( (unsigned char)(colNextMostFreq >> 16),
 320                              (unsigned char)(colNextMostFreq >> 8),
 321                              (unsigned char)(colNextMostFreq) );
 322
 323     int fg_intensity = fg.Red() + fg.Green() + fg.Blue();
 324     int bg_intensity = bg.Red() + bg.Green() + bg.Blue();
 325
 326     if (bg_intensity > fg_intensity)
 327     {
 328         //swap fg and bg
 329         wxColour tmp = fg;
 330         fg = bg;
 331         bg = tmp;
 332     }
 333
 334     int hotSpotX, hotSpotY;
 335     GetHotSpot(image, hotSpotX, hotSpotY);
 336
 337     GdkBitmap *data = gdk_bitmap_create_from_data(wxGetRootWindow()->window,
 338                                                   (gchar *) bits, w, h);
 339     GdkBitmap *mask = gdk_bitmap_create_from_data(wxGetRootWindow()->window,
 340                                                   (gchar *) maskBits, w, h);
 341
 342     m_refData = new wxCursorRefData;
 343     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap
 344                              (
 345                                 data,
 346                                 mask,
 347                                 fg.GetColor(), bg.GetColor(),
 348                                 hotSpotX, hotSpotY
 349                              );
 350
 351     g_object_unref (data);
 352     g_object_unref (mask);
 353     delete [] bits;
 354     delete [] maskBits;
 355 }
 356
 357 #endif // wxUSE_IMAGE
 358
 359 wxCursor::~wxCursor()
 360 {
 361 }
 362
 363 bool wxCursor::IsOk() const
 364 {
 365     return (m_refData != NULL);
 366 }
 367
 368 GdkCursor *wxCursor::GetCursor() const
 369 {
 370     return M_CURSORDATA->m_cursor;
 371 }
 372
 373 //-----------------------------------------------------------------------------
 374 // busy cursor routines
 375 //-----------------------------------------------------------------------------
 376
 377 /* Current cursor, in order to hang on to
 378  * cursor handle when setting the cursor globally */
 379 wxCursor g_globalCursor;
 380
 381 static wxCursor  gs_savedCursor;
 382 static int       gs_busyCount = 0;
 383
 384 const wxCursor &wxBusyCursor::GetStoredCursor()
 385 {
 386     return gs_savedCursor;
 387 }
 388
 389 const wxCursor wxBusyCursor::GetBusyCursor()
 390 {
 391     return wxCursor(wxCURSOR_WATCH);
 392 }
 393
 394 void wxEndBusyCursor()
 395 {
 396     if (--gs_busyCount > 0)
 397         return;
 398
 399     wxSetCursor( gs_savedCursor );
 400     gs_savedCursor = wxNullCursor;
 401
 402     if (wxTheApp)
 403         wxTheApp->ProcessIdle();
 404 }
 405
 406 void wxBeginBusyCursor( const wxCursor *WXUNUSED(cursor) )
 407 {
 408     if (gs_busyCount++ > 0)
 409         return;
 410
 411     wxASSERT_MSG( !gs_savedCursor.Ok(),
 412                   wxT("forgot to call wxEndBusyCursor, will leak memory") );
 413
 414     gs_savedCursor = g_globalCursor;
 415
 416     wxSetCursor( wxCursor(wxCURSOR_WATCH) );
 417
 418     if (wxTheApp)
 419         wxTheApp->ProcessIdle();
 420
 421     gdk_flush();
 422 }
 423
 424 bool wxIsBusy()
 425 {
 426     return gs_busyCount > 0;
 427 }
 428
 429 void wxSetCursor( const wxCursor& cursor )
 430 {
 431     g_globalCursor = cursor;
 432     wxTheApp->WakeUpIdle();
 433 }