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 wxGDIRefData
  29 {
  30 public:
  31     wxCursorRefData();
  32     virtual ~wxCursorRefData();
  33
  34     virtual bool IsOk() const { return m_cursor != NULL; }
  35
  36     GdkCursor *m_cursor;
  37 };
  38
  39 wxCursorRefData::wxCursorRefData()
  40 {
  41     m_cursor = (GdkCursor *) NULL;
  42 }
  43
  44 wxCursorRefData::~wxCursorRefData()
  45 {
  46     if (m_cursor) gdk_cursor_unref( m_cursor );
  47 }
  48
  49 //-----------------------------------------------------------------------------
  50
  51 #define M_CURSORDATA ((wxCursorRefData *)m_refData)
  52
  53 IMPLEMENT_DYNAMIC_CLASS(wxCursor,wxObject)
  54
  55 wxCursor::wxCursor()
  56 {
  57
  58 }
  59
  60 wxCursor::wxCursor( int cursorId )
  61 {
  62     m_refData = new wxCursorRefData();
  63
  64     GdkCursorType gdk_cur = GDK_LEFT_PTR;
  65     switch (cursorId)
  66     {
  67         case wxCURSOR_BLANK:
  68             {
  69                 static const gchar bits[] = { 0 };
  70                 static /* const -- not in GTK1 */ GdkColor color = { 0, 0, 0, 0 };
  71
  72                 GdkPixmap *pixmap = gdk_bitmap_create_from_data(NULL, bits, 1, 1);
  73                 M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(pixmap,
  74                                                                     pixmap,
  75                                                                     &color,
  76                                                                     &color,
  77                                                                     0, 0);
  78             }
  79             return;
  80
  81         case wxCURSOR_ARROW:            // fall through to default
  82         case wxCURSOR_DEFAULT:          gdk_cur = GDK_LEFT_PTR; break;
  83         case wxCURSOR_RIGHT_ARROW:      gdk_cur = GDK_RIGHT_PTR; break;
  84         case wxCURSOR_HAND:             gdk_cur = GDK_HAND1; break;
  85         case wxCURSOR_CROSS:            gdk_cur = GDK_CROSSHAIR; break;
  86         case wxCURSOR_SIZEWE:           gdk_cur = GDK_SB_H_DOUBLE_ARROW; break;
  87         case wxCURSOR_SIZENS:           gdk_cur = GDK_SB_V_DOUBLE_ARROW; break;
  88         case wxCURSOR_ARROWWAIT:
  89         case wxCURSOR_WAIT:
  90         case wxCURSOR_WATCH:            gdk_cur = GDK_WATCH; break;
  91         case wxCURSOR_SIZING:           gdk_cur = GDK_SIZING; break;
  92         case wxCURSOR_SPRAYCAN:         gdk_cur = GDK_SPRAYCAN; break;
  93         case wxCURSOR_IBEAM:            gdk_cur = GDK_XTERM; break;
  94         case wxCURSOR_PENCIL:           gdk_cur = GDK_PENCIL; break;
  95         case wxCURSOR_NO_ENTRY:         gdk_cur = GDK_PIRATE; break;
  96         case wxCURSOR_SIZENWSE:
  97         case wxCURSOR_SIZENESW:         gdk_cur = GDK_FLEUR; break;
  98         case wxCURSOR_QUESTION_ARROW:   gdk_cur = GDK_QUESTION_ARROW; break;
  99         case wxCURSOR_PAINT_BRUSH:      gdk_cur = GDK_SPRAYCAN; break;
 100         case wxCURSOR_MAGNIFIER:        gdk_cur = GDK_PLUS; break;
 101         case wxCURSOR_CHAR:             gdk_cur = GDK_XTERM; break;
 102         case wxCURSOR_LEFT_BUTTON:      gdk_cur = GDK_LEFTBUTTON; break;
 103         case wxCURSOR_MIDDLE_BUTTON:    gdk_cur = GDK_MIDDLEBUTTON; break;
 104         case wxCURSOR_RIGHT_BUTTON:     gdk_cur = GDK_RIGHTBUTTON; break;
 105         case wxCURSOR_BULLSEYE:         gdk_cur = GDK_TARGET; break;
 106
 107         case wxCURSOR_POINT_LEFT:       gdk_cur = GDK_SB_LEFT_ARROW; break;
 108         case wxCURSOR_POINT_RIGHT:      gdk_cur = GDK_SB_RIGHT_ARROW; break;
 109 /*
 110         case wxCURSOR_DOUBLE_ARROW:     gdk_cur = GDK_DOUBLE_ARROW; break;
 111         case wxCURSOR_CROSS_REVERSE:    gdk_cur = GDK_CROSS_REVERSE; break;
 112         case wxCURSOR_BASED_ARROW_UP:   gdk_cur = GDK_BASED_ARROW_UP; break;
 113         case wxCURSOR_BASED_ARROW_DOWN: gdk_cur = GDK_BASED_ARROW_DOWN; break;
 114 */
 115
 116         default:
 117             wxFAIL_MSG(wxT("unsupported cursor type"));
 118             // will use the standard one
 119             break;
 120     }
 121
 122     M_CURSORDATA->m_cursor = gdk_cursor_new( gdk_cur );
 123 }
 124
 125 extern GtkWidget *wxGetRootWindow();
 126
 127 wxCursor::wxCursor(const char bits[], int width, int  height,
 128                    int hotSpotX, int hotSpotY,
 129                    const char maskBits[], const wxColour *fg, const wxColour *bg)
 130 {
 131     if (!maskBits)
 132         maskBits = bits;
 133     if (!fg)
 134         fg = wxBLACK;
 135     if (!bg)
 136         bg = wxWHITE;
 137     if (hotSpotX < 0 || hotSpotX >= width)
 138         hotSpotX = 0;
 139     if (hotSpotY < 0 || hotSpotY >= height)
 140         hotSpotY = 0;
 141
 142     GdkBitmap *data = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) bits, width, height );
 143     GdkBitmap *mask = gdk_bitmap_create_from_data( wxGetRootWindow()->window, (gchar *) maskBits, width, height);
 144
 145     m_refData = new wxCursorRefData;
 146     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap(
 147                  data, mask, fg->GetColor(), bg->GetColor(),
 148                  hotSpotX, hotSpotY );
 149
 150     g_object_unref (data);
 151     g_object_unref (mask);
 152 }
 153
 154 #if wxUSE_IMAGE
 155
 156 static void GetHotSpot(const wxImage& image, int& x, int& y)
 157 {
 158     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X))
 159         x = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X);
 160     else
 161         x = 0;
 162
 163     if (image.HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y))
 164         y = image.GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y);
 165     else
 166         y = 0;
 167
 168     if (x < 0 || x >= image.GetWidth())
 169         x = 0;
 170     if (y < 0 || y >= image.GetHeight())
 171         y = 0;
 172 }
 173
 174 wxCursor::wxCursor( const wxImage & image )
 175 {
 176     unsigned char * rgbBits = image.GetData();
 177     int w = image.GetWidth() ;
 178     int h = image.GetHeight();
 179     bool bHasMask = image.HasMask();
 180     int imagebitcount = (w*h)/8;
 181
 182     if ( gdk_display_supports_cursor_color(gdk_display_get_default()) )
 183     {
 184         unsigned char rMask = 0,
 185                       gMask = 0,
 186                       bMask = 0;
 187         if (bHasMask)
 188         {
 189             rMask = image.GetMaskRed();
 190             gMask = image.GetMaskGreen();
 191             bMask = image.GetMaskBlue();
 192         }
 193
 194         GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8, w, h);
 195         unsigned char *alpha = image.HasAlpha() ? image.GetAlpha() : NULL;
 196         unsigned char *out = gdk_pixbuf_get_pixels(pixbuf);
 197         int rowpad = gdk_pixbuf_get_rowstride(pixbuf) - 4 * w;
 198         for ( int y = 0; y < h; y++, out += rowpad )
 199         {
 200             for ( int x = 0; x < w; x++, out += 4, rgbBits += 3 )
 201             {
 202                 out[0] = rgbBits[0];
 203                 out[1] = rgbBits[1];
 204                 out[2] = rgbBits[2];
 205                 if (bHasMask &&
 206                     out[0] == rMask && out[1] == gMask && out[2] == bMask)
 207                     out[3] = 0;
 208                 else
 209                     out[3] = alpha ? *alpha : 255;
 210                 if ( alpha )
 211                     ++alpha;
 212             }
 213         }
 214
 215         int hotSpotX, hotSpotY;
 216         GetHotSpot(image, hotSpotX, hotSpotY);
 217
 218         m_refData = new wxCursorRefData;
 219         M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixbuf
 220                              (
 221                               gdk_display_get_default(),
 222                               pixbuf,
 223                               hotSpotX, hotSpotY
 224                              );
 225         g_object_unref (pixbuf);
 226         return;
 227     }
 228
 229     unsigned char * bits = new unsigned char [imagebitcount];
 230     unsigned char * maskBits = new unsigned char [imagebitcount];
 231
 232     int i, j, i8; unsigned char c, cMask;
 233     for (i=0; i<imagebitcount; i++)
 234     {
 235         bits[i] = 0;
 236         i8 = i * 8;
 237
 238         cMask = 1;
 239         for (j=0; j<8; j++)
 240         {
 241             // possible overflow if we do the summation first ?
 242             c = rgbBits[(i8+j)*3]/3 + rgbBits[(i8+j)*3+1]/3 + rgbBits[(i8+j)*3+2]/3;
 243             //if average value is > mid grey
 244             if (c>127)
 245                 bits[i] = bits[i] | cMask;
 246             cMask = cMask * 2;
 247         }
 248     }
 249
 250     unsigned long keyMaskColor;
 251     if (bHasMask)
 252     {
 253         unsigned char
 254             r = image.GetMaskRed(),
 255             g = image.GetMaskGreen(),
 256             b = image.GetMaskBlue();
 257
 258         for (i=0; i<imagebitcount; i++)
 259         {
 260             maskBits[i] = 0x0;
 261             i8 = i * 8;
 262
 263             cMask = 1;
 264             for (j=0; j<8; j++)
 265             {
 266                 if (rgbBits[(i8+j)*3] != r || rgbBits[(i8+j)*3+1] != g || rgbBits[(i8+j)*3+2] != b)
 267                     maskBits[i] = maskBits[i] | cMask;
 268                 cMask = cMask * 2;
 269             }
 270         }
 271
 272         keyMaskColor = (r << 16) | (g << 8) | b;
 273     }
 274     else // no mask
 275     {
 276         for (i=0; i<imagebitcount; i++)
 277             maskBits[i] = 0xFF;
 278
 279         // init it to avoid compiler warnings
 280         keyMaskColor = 0;
 281     }
 282
 283     // find the most frequent color(s)
 284     wxImageHistogram histogram;
 285     image.ComputeHistogram(histogram);
 286
 287     // colors as rrggbb
 288     unsigned long key;
 289     unsigned long value;
 290
 291     long colMostFreq = 0;
 292     unsigned long nMost = 0;
 293     long colNextMostFreq = 0;
 294     unsigned long nNext = 0;
 295     for ( wxImageHistogram::iterator entry = histogram.begin();
 296           entry != histogram.end();
 297           ++entry )
 298     {
 299         value = entry->second.value;
 300         key = entry->first;
 301         if ( !bHasMask || (key != keyMaskColor) )
 302         {
 303             if (value > nMost)
 304             {
 305                 nMost = value;
 306                 colMostFreq = key;
 307             }
 308             else if (value > nNext)
 309             {
 310                 nNext = value;
 311                 colNextMostFreq = key;
 312             }
 313         }
 314     }
 315
 316     wxColour fg = wxColour ( (unsigned char)(colMostFreq >> 16),
 317                              (unsigned char)(colMostFreq >> 8),
 318                              (unsigned char)(colMostFreq) );
 319
 320     wxColour bg = wxColour ( (unsigned char)(colNextMostFreq >> 16),
 321                              (unsigned char)(colNextMostFreq >> 8),
 322                              (unsigned char)(colNextMostFreq) );
 323
 324     int fg_intensity = fg.Red() + fg.Green() + fg.Blue();
 325     int bg_intensity = bg.Red() + bg.Green() + bg.Blue();
 326
 327     if (bg_intensity > fg_intensity)
 328     {
 329         //swap fg and bg
 330         wxColour tmp = fg;
 331         fg = bg;
 332         bg = tmp;
 333     }
 334
 335     int hotSpotX, hotSpotY;
 336     GetHotSpot(image, hotSpotX, hotSpotY);
 337
 338     GdkBitmap *data = gdk_bitmap_create_from_data(wxGetRootWindow()->window,
 339                                                   (gchar *) bits, w, h);
 340     GdkBitmap *mask = gdk_bitmap_create_from_data(wxGetRootWindow()->window,
 341                                                   (gchar *) maskBits, w, h);
 342
 343     m_refData = new wxCursorRefData;
 344     M_CURSORDATA->m_cursor = gdk_cursor_new_from_pixmap
 345                              (
 346                                 data,
 347                                 mask,
 348                                 fg.GetColor(), bg.GetColor(),
 349                                 hotSpotX, hotSpotY
 350                              );
 351
 352     g_object_unref (data);
 353     g_object_unref (mask);
 354     delete [] bits;
 355     delete [] maskBits;
 356 }
 357
 358 #endif // wxUSE_IMAGE
 359
 360 wxCursor::~wxCursor()
 361 {
 362 }
 363
 364 GdkCursor *wxCursor::GetCursor() const
 365 {
 366     return M_CURSORDATA->m_cursor;
 367 }
 368
 369 wxGDIRefData *wxCursor::CreateGDIRefData() const
 370 {
 371     return new wxCursorRefData;
 372 }
 373
 374 wxGDIRefData *wxCursor::CloneGDIRefData(const wxGDIRefData *data) const
 375 {
 376     return new wxCursorRefData(*wx_static_cast(const wxCursorRefData *, data));
 377 }
 378
 379 //-----------------------------------------------------------------------------
 380 // busy cursor routines
 381 //-----------------------------------------------------------------------------
 382
 383 /* Current cursor, in order to hang on to
 384  * cursor handle when setting the cursor globally */
 385 wxCursor g_globalCursor;
 386
 387 static wxCursor  gs_savedCursor;
 388 static int       gs_busyCount = 0;
 389
 390 const wxCursor &wxBusyCursor::GetStoredCursor()
 391 {
 392     return gs_savedCursor;
 393 }
 394
 395 const wxCursor wxBusyCursor::GetBusyCursor()
 396 {
 397     return wxCursor(wxCURSOR_WATCH);
 398 }
 399
 400 void wxEndBusyCursor()
 401 {
 402     if (--gs_busyCount > 0)
 403         return;
 404
 405     wxSetCursor( gs_savedCursor );
 406     gs_savedCursor = wxNullCursor;
 407
 408     if (wxTheApp)
 409         wxTheApp->ProcessIdle();
 410 }
 411
 412 void wxBeginBusyCursor( const wxCursor *WXUNUSED(cursor) )
 413 {
 414     if (gs_busyCount++ > 0)
 415         return;
 416
 417     wxASSERT_MSG( !gs_savedCursor.Ok(),
 418                   wxT("forgot to call wxEndBusyCursor, will leak memory") );
 419
 420     gs_savedCursor = g_globalCursor;
 421
 422     wxSetCursor( wxCursor(wxCURSOR_WATCH) );
 423
 424     if (wxTheApp)
 425         wxTheApp->ProcessIdle();
 426
 427     gdk_flush();
 428 }
 429
 430 bool wxIsBusy()
 431 {
 432     return gs_busyCount > 0;
 433 }
 434
 435 void wxSetCursor( const wxCursor& cursor )
 436 {
 437     g_globalCursor = cursor;
 438     wxTheApp->WakeUpIdle();
 439 }