- NSBitmapImageRep *theRep =
- [[NSBitmapImageRep alloc]
- initWithBitmapDataPlanes:nil // Allocate the buffer for us :)
- pixelsWide:16
- pixelsHigh:16
- bitsPerSample:1
- samplesPerPixel:2
- hasAlpha:YES // Well, more like a mask...
- isPlanar:NO
- colorSpaceName:NSCalibratedWhiteColorSpace // Normal B/W - 0 black 1 white
- bytesPerRow:0 // I don't care - figure it out for me :)
- bitsPerPixel:2]; // bitsPerSample * samplesPerPixel
-
- //unsigned int is better to put data in then a void*
- //note that working with bitfields would be a lot better here -
- //but since it breaks some compilers...
- wxUint32 *data = (wxUint32 *)[theRep bitmapData];
-
- //traverse through the bitmap data
- for (int i = 0; i < 16; ++i)
+ NSBitmapImageRep *theRep = [[NSBitmapImageRep alloc]
+ initWithBitmapDataPlanes: NULL // Tell Cocoa to allocate the planes for us.
+ pixelsWide: 16 // All classic cursors are 16x16
+ pixelsHigh: 16
+ bitsPerSample: 1 // All classic cursors are bitmaps with bitmasks
+ samplesPerPixel: 2 // Sample 0:image 1:mask
+ hasAlpha: YES // Identify last sample as a mask
+ isPlanar: YES // Use a separate array for each sample
+ colorSpaceName: NSCalibratedWhiteColorSpace // 0.0=black 1.0=white
+ bytesPerRow: 2 // Rows in each plane are on 2-byte boundaries (no pad)
+ bitsPerPixel: 1]; // same as bitsPerSample since data is planar
+
+ // Ensure that Cocoa allocated 2 and only 2 of the 5 possible planes
+ unsigned char *planes[5];
+ [theRep getBitmapDataPlanes:planes];
+ wxASSERT(planes[0] != NULL);
+ wxASSERT(planes[1] != NULL);
+ wxASSERT(planes[2] == NULL);
+ wxASSERT(planes[3] == NULL);
+ wxASSERT(planes[4] == NULL);
+
+ // NOTE1: The Cursor's bits field is white=0 black=1.. thus the bitwise-not
+ // Why not use NSCalibratedBlackColorSpace? Because that reverses the
+ // sense of the alpha (mask) plane.
+ // NOTE2: The mask data is 0=off 1=on
+ // NOTE3: Cocoa asks for "premultiplied" color planes. Since we have a
+ // 1-bit color plane and a 1-bit alpha plane we can just do a bitwise-and
+ // on the two. The original cursor bitmaps have 0 (white actually) for
+ // any masked-off pixels. Therefore every masked-off pixel would be wrong
+ // since we bit-flip all of the picture bits. In practice, Cocoa doesn't
+ // seem to care, but we are following the documentation.
+
+ // Fill in the color (black/white) plane
+ for(int i=0; i<16; ++i)
+ {
+ planes[0][2*i ] = (~pCursor->bits[i] & pCursor->mask[i]) >> 8 & 0xff;
+ planes[0][2*i+1] = (~pCursor->bits[i] & pCursor->mask[i]) & 0xff;
+ }
+ // Fill in the alpha (i.e. mask) plane
+ for(int i=0; i<16; ++i)
projects / wxWidgets.git / blobdiff