mac_cursor.m

 
#import <AppKit/AppKit.h>
 
#include <math.h>
 
#include <winpr/assert.h>
 
#include "mac_cursor.h"
 
BOOL mac_cursor_get(macCursorImage *image, UINT32 maxSize)
{
  WINPR_ASSERT(image);
  memset(image, 0, sizeof(*image));
 
  @autoreleasepool
  {
    /* the cursor of whatever application is in front, not only ours */
    NSCursor *cursor = [NSCursor currentSystemCursor];
    NSImage *picture = cursor.image;
    if (!picture)
      return FALSE;
 
    const NSSize size = picture.size;
    const NSPoint hot = cursor.hotSpot;
    const double width = ceil(size.width);
    const double height = ceil(size.height);
    if ((width < 1.0) || (height < 1.0) || (width > maxSize) || (height > maxSize))
      return FALSE;
 
    /* the representation drawn at the size in points: on a Retina display
     * that is the 2x one, scaled down like the screen itself */
    NSRect rect = NSMakeRect(0, 0, width, height);
    CGImageRef cgImage = [picture CGImageForProposedRect:&rect context:nil hints:nil];
    if (!cgImage)
      return FALSE;
 
    const size_t w = (size_t)width;
    const size_t h = (size_t)height;
    BYTE *pixels = calloc(w * h, 4);
    if (!pixels)
      return FALSE;
 
    /* premultiplied ARGB in a little-endian word: B, G, R, A in memory */
    CGColorSpaceRef space = CGColorSpaceCreateWithName(kCGColorSpaceSRGB);
    CGContextRef context =
        CGBitmapContextCreate(pixels, w, h, 8, w * 4, space,
                              kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little);
    CGColorSpaceRelease(space);
    if (!context)
    {
      free(pixels);
      return FALSE;
    }
    CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);
    CGContextRelease(context);
 
    image->width = (UINT32)w;
    image->height = (UINT32)h;
    image->xHot = (UINT32)MIN(MAX(hot.x, 0.0), width - 1.0);
    image->yHot = (UINT32)MIN(MAX(hot.y, 0.0), height - 1.0);
    image->pixels = pixels;
  }
  return TRUE;
}
 
void mac_cursor_image_free(macCursorImage *image)
{
  if (!image)
    return;
  free(image->pixels);
  image->pixels = NULL;
}