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gdk: Implement cursor from texture on MacOS

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This is done with a NSCursor whose content is an NSImage. Image pixels are filled by a NSBitmap, and the format is premultiplied RGBA. So we can just use the texture downloader with GDK_MEMORY_R8G8B8A8_PREMULTIPLIED format.
This commit is contained in:
Fabio Lagalla 2024-03-05 10:26:27 +01:00
parent d7050c63ae
commit 8080d9e7c1
1 changed files with 62 additions and 1 deletions
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63
gdk/macos/gdkmacoscursor.c
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@ -147,6 +147,57 @@ create_blank_cursor (void)
return nscursor;
}
static NSCursor *
create_cursor_from_texture (GdkTexture *texture,
int x,
int y)
{
guint32 width;
guint32 height;
guchar *pixels;
gsize stride;
GdkTextureDownloader *downloader;
NSCursor *nscursor;
NSBitmapImageRep *nsbitmap;
NSImage *nsimage;
if (texture == NULL)
return create_blank_cursor ();
width = gdk_texture_get_width (texture);
height = gdk_texture_get_height (texture);
nsbitmap = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL
pixelsWide:width
pixelsHigh:height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSDeviceRGBColorSpace
bytesPerRow:0
bitsPerPixel:0];
pixels = [nsbitmap bitmapData];
stride = [nsbitmap bytesPerRow];
downloader = gdk_texture_downloader_new (texture);
gdk_texture_downloader_set_format (downloader, GDK_MEMORY_R8G8B8A8_PREMULTIPLIED);
gdk_texture_downloader_download_into (downloader,
pixels,
stride);
gdk_texture_downloader_free (downloader);
nsimage = [[NSImage alloc] init];
[nsimage addRepresentation:nsbitmap];
[nsimage setSize:NSMakeSize(width, height)];
[nsbitmap release];
nscursor = [[NSCursor alloc] initWithImage:nsimage
hotSpot:NSMakePoint(x, y)];
[nsimage release];
return nscursor;
}
NSCursor *
_gdk_macos_cursor_get_ns_cursor (GdkCursor *cursor)
{
@ -157,7 +208,17 @@ _gdk_macos_cursor_get_ns_cursor (GdkCursor *cursor)
g_return_val_if_fail (!cursor || GDK_IS_CURSOR (cursor), NULL);
if (cursor != NULL)
name = gdk_cursor_get_name (cursor);
{
name = gdk_cursor_get_name (cursor);
if (name == NULL)
{
nscursor = create_cursor_from_texture (gdk_cursor_get_texture (cursor),
gdk_cursor_get_hotspot_x (cursor),
gdk_cursor_get_hotspot_y (cursor));
return nscursor;
}
}
if (name == NULL)
goto load_cursor;