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macos: add readonly IOSurfaceLock helper

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This can be used to lock a surface for reading to avoid causing the
surface contents to be invalidated. This is needed when reading back from
a front-buffer to the back-buffer as is needed when using Cairo surfaces
to implement something similar to BufferAge.
This commit is contained in:
Christian Hergert 2022-02-28 01:29:22 -08:00 committed by Christian Hergert
parent b19526489e
commit b2ab0b1fcb
2 changed files with 41 additions and 0 deletions
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2
gdk/macos/gdkmacosbuffer-private.h
View File

@ -41,6 +41,8 @@ GdkMacosBuffer *_gdk_macos_buffer_new (int width
IOSurfaceRef _gdk_macos_buffer_get_native (GdkMacosBuffer *self);
void _gdk_macos_buffer_lock (GdkMacosBuffer *self);
void _gdk_macos_buffer_unlock (GdkMacosBuffer *self);
void _gdk_macos_buffer_read_lock (GdkMacosBuffer *self);
void _gdk_macos_buffer_read_unlock (GdkMacosBuffer *self);
guint _gdk_macos_buffer_get_width (GdkMacosBuffer *self);
guint _gdk_macos_buffer_get_height (GdkMacosBuffer *self);
guint _gdk_macos_buffer_get_stride (GdkMacosBuffer *self);

39
gdk/macos/gdkmacosbuffer.c
View File

@ -192,6 +192,45 @@ _gdk_macos_buffer_unlock (GdkMacosBuffer *self)
IOSurfaceUnlock (self->surface, 0, NULL);
}
/**
* _gdk_macos_buffer_lock_readonly:
*
* Like _gdk_macos_buffer_lock() but uses the read-only flag to
* indicate we are not interested in retrieving the updates from
* the GPU before modifying the CPU-side cache.
*
* Must be used with _gdk_macos_buffer_unlock_readonly().
*/
void
_gdk_macos_buffer_read_lock (GdkMacosBuffer *self)
{
kern_return_t ret;
g_return_if_fail (GDK_IS_MACOS_BUFFER (self));
g_return_if_fail (self->lock_count == 0);
self->lock_count++;
ret = IOSurfaceLock (self->surface, kIOSurfaceLockReadOnly, NULL);
g_return_if_fail (ret == KERN_SUCCESS);
}
void
_gdk_macos_buffer_read_unlock (GdkMacosBuffer *self)
{
kern_return_t ret;
g_return_if_fail (GDK_IS_MACOS_BUFFER (self));
g_return_if_fail (self->lock_count == 1);
self->lock_count--;
ret = IOSurfaceUnlock (self->surface, kIOSurfaceLockReadOnly, NULL);
g_return_if_fail (ret == KERN_SUCCESS);
}
guint
_gdk_macos_buffer_get_width (GdkMacosBuffer *self)
{