gdkcursor-win32.c

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/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"

#include "gdkcursor.h"
#include "gdkwin32.h"

static const struct {
   const char *name;
   int type;
} cursors[] = {
   {
   "x_cursor", 0}, {
   "arrow", 2}, {
   "bottom_left_corner", 12}, {
   "bottom_right_corner", 14}, {
   "bottom_side", 16}, {
   "busy", 21}, {
   "center_ptr", 22}, {
   "circle", 24}, {
   "kr", 34}, {
   "dot", 38}, {
   "dotbox", 40}, {
   "double_arrow", 42}, {
   "exchange", 50}, {
   "fleur", 52}, {
   "gobbler", 54}, {
   "gumby", 56}, {
   "hand1", 58}, {
   "hand2", 60}, {
   "heart", 62}, {
   "left_ptr", 68}, {
   "left_side", 70}, {
   "pencil", 86}, {
   "pirate", 88}, {
   "plus", 90}, {
   "question_arrow", 92}, {
   "right_ptr", 94}, {
   "right_side", 96}, {
   "sb_down_arrow", 106}, {
   "sb_h_double_arrow", 108}, {
   "sb_left_arrow", 110}, {
   "sb_right_arrow", 112}, {
   "sb_up_arrow", 114}, {
   "sb_v_double_arrow", 116}, {
   "shuttle", 118}, {
   "spider", 122}, {
   "spraycan", 124}, {
   "star", 126}, {
   "top_left_arrow", 132}, {
   "top_left_corner", 134}, {
   "top_right_corner", 136}, {
   "top_side", 138}, {
   "umbrella", 146}, {
   "watch", 150}, {
   "xterm", 152}, {
   NULL, 0}
};

GdkCursor *gdk_cursor_new(GdkCursorType cursor_type)
{
   GdkCursorPrivate *private;
   GdkCursor *cursor;
   HCURSOR xcursor;
   int i;

   for (i = 0; cursors[i].name != NULL && cursors[i].type != cursor_type;
        i++);
   if (cursors[i].name != NULL) {
      xcursor = LoadImage(gdk_DLLInstance, cursors[i].name, IMAGE_CURSOR,
                          0, 0, 0);
      if (xcursor == NULL)
         WIN32_API_FAILED("LoadImage");
      GDK_NOTE(MISC, g_print("gdk_cursor_new: %#x %d\n",
                             xcursor, cursor_type));
   } else {
      g_warning("gdk_cursor_new: no cursor %d found", cursor_type);
      xcursor = NULL;
   }

   private = g_new(GdkCursorPrivate, 1);
   private->xcursor = xcursor;
   cursor = (GdkCursor *) private;
   cursor->type = cursor_type;
   cursor->ref_count = 1;

   return cursor;
}

GdkCursor *gdk_syscursor_new(unsigned long syscur)
{
   GdkCursorPrivate *private;
   GdkCursor *cursor;
   HCURSOR xcursor;
   xcursor = LoadCursor(NULL, (LPCTSTR)syscur);
   if (xcursor == NULL)
      WIN32_API_FAILED("LoadCursor");
   GDK_NOTE(MISC, g_print("gdk_syscursor_new: %#x %ld\n",
                          xcursor, syscur));

   private = g_new(GdkCursorPrivate, 1);
   private->xcursor = xcursor;
   cursor = (GdkCursor *) private;
   cursor->type = LOWORD(syscur);
   cursor->ref_count = 1;

   return cursor;
}

static gboolean color_is_white(GdkColor * color)
{
   return (color->red == 0xFFFF
           && color->green == 0xFFFF && color->blue == 0xFFFF);
}

GdkCursor *gdk_cursor_new_from_pixmap(GdkPixmap * source,
                                      GdkPixmap * mask,
                                      GdkColor * fg,
                                      GdkColor * bg, gint x, gint y)
{
   GdkCursorPrivate *private;
   GdkCursor *cursor;
   GdkDrawablePrivate *source_private, *mask_private;
   GdkImage *source_image, *mask_image;
   HCURSOR xcursor;
   guchar *p, *q, *XORmask, *ANDmask;
   gint width, height, cursor_width, cursor_height;
   guchar residue;
   gint ix, iy;
   gboolean bg_is_white = color_is_white(bg);

   g_return_val_if_fail(source != NULL, NULL);
   g_return_val_if_fail(mask != NULL, NULL);

   source_private = (GdkDrawablePrivate *) source;
   mask_private = (GdkDrawablePrivate *) mask;

   g_return_val_if_fail(source_private->width == mask_private->width
                        && source_private->height == mask_private->height,
                        NULL);
   width = source_private->width;
   height = source_private->height;
   cursor_width = GetSystemMetrics(SM_CXCURSOR);
   cursor_height = GetSystemMetrics(SM_CYCURSOR);

   g_return_val_if_fail(width <= cursor_width
                        && height <= cursor_height, NULL);

   residue = (1 << ((8 - (width % 8)) % 8)) - 1;

   source_image = gdk_image_get(source, 0, 0, width, height);
   mask_image = gdk_image_get(mask, 0, 0, width, height);

   if (source_image->depth != 1 || mask_image->depth != 1) {
      gdk_image_unref(source_image);
      gdk_image_unref(mask_image);
      g_return_val_if_fail(source_image->depth == 1
                           && mask_image->depth == 1, NULL);
   }

   /* Such complex bit manipulation for this simple task, sigh.
    * The X cursor and Windows cursor concepts are quite different.
    * We assume here that we are always called with fg == black and
    * bg == white, *or* the other way around. Random colours won't work.
    * (Well, you will get a cursor, but not in those colours.)
    */

   /* Note: The comments below refer to the case fg==black and
    * bg==white.
    */

   /* First set masked-out source bits, as all source bits matter on Windoze.
    * As we invert them below, they will be clear in the final XORmask.
    */
   for (iy = 0; iy < height; iy++) {
      p = (guchar *) source_image->mem + iy * source_image->bpl;
      q = (guchar *) mask_image->mem + iy * mask_image->bpl;

      for (ix = 0; ix < ((width - 1) / 8 + 1); ix++)
         if (bg_is_white)
            *p++ |= ~(*q++);
         else
            *p++ &= *q++;
   }

   /* XOR mask is initialized to zero */
   XORmask = g_malloc0(cursor_width / 8 * cursor_height);

   for (iy = 0; iy < height; iy++) {
      p = (guchar *) source_image->mem + iy * source_image->bpl;
      q = XORmask + iy * cursor_width / 8;

      for (ix = 0; ix < ((width - 1) / 8 + 1); ix++)
         if (bg_is_white)
            *q++ = ~(*p++);
         else
            *q++ = *p++;
      q[-1] &= ~residue;        /* Clear left-over bits */
   }

   /* AND mask is initialized to ones */
   ANDmask = g_malloc(cursor_width / 8 * cursor_height);
   memset(ANDmask, 0xFF, cursor_width / 8 * cursor_height);

   for (iy = 0; iy < height; iy++) {
      p = (guchar *) mask_image->mem + iy * mask_image->bpl;
      q = ANDmask + iy * cursor_width / 8;

      for (ix = 0; ix < ((width - 1) / 8 + 1); ix++)
         *q++ = ~(*p++);
      q[-1] |= residue;         /* Set left-over bits */
   }

   xcursor =
       CreateCursor(gdk_ProgInstance, x, y, cursor_width, cursor_height,
                    ANDmask, XORmask);

   GDK_NOTE(MISC, g_print("gdk_cursor_new_from_pixmap: "
                          "%#x (%dx%d) %#x (%dx%d) = %#x (%dx%d)\n",
                          GDK_DRAWABLE_XID(source),
                          source_private->width, source_private->height,
                          GDK_DRAWABLE_XID(mask),
                          mask_private->width, mask_private->height,
                          xcursor, cursor_width, cursor_height));

   g_free(XORmask);
   g_free(ANDmask);

   gdk_image_unref(source_image);
   gdk_image_unref(mask_image);

   private = g_new(GdkCursorPrivate, 1);
   private->xcursor = xcursor;
   cursor = (GdkCursor *) private;
   cursor->type = GDK_CURSOR_IS_PIXMAP;
   cursor->ref_count = 1;

   return cursor;
}

void _gdk_cursor_destroy(GdkCursor * cursor)
{
   GdkCursorPrivate *private;

   g_return_if_fail(cursor != NULL);
   private = (GdkCursorPrivate *) cursor;

   GDK_NOTE(MISC, g_print("_gdk_cursor_destroy: %#x\n",
                          (cursor->type ==
                           GDK_CURSOR_IS_PIXMAP) ? private->xcursor : 0));

   if (cursor->type == GDK_CURSOR_IS_PIXMAP) {
      if (!DestroyCursor(private->xcursor))
         WIN32_API_FAILED("DestroyCursor");
   }
   g_free(private);
}

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