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cogl/dma-buf: Add mmap/munmap helpers

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Avoids dealing directly with mmap() and munmap().

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1237
This commit is contained in:
Jonas Ådahl 2020-05-06 22:12:46 +02:00 committed by Georges Basile Stavracas Neto
parent 5b07ccd0a7
commit f8daa6bc70
2 changed files with 50 additions and 0 deletions
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41
cogl/cogl/cogl-dma-buf-handle.c
View File

@ -38,6 +38,7 @@
#include <gio/gio.h> #include <gio/gio.h>
#include <linux/dma-buf.h> #include <linux/dma-buf.h>
#include <sys/ioctl.h> #include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h> #include <unistd.h>
struct _CoglDmaBufHandle struct _CoglDmaBufHandle
@ -147,6 +148,46 @@ cogl_dma_buf_handle_sync_read_end (CoglDmaBufHandle *dmabuf_handle,
return sync_read (dmabuf_handle, DMA_BUF_SYNC_END, error); return sync_read (dmabuf_handle, DMA_BUF_SYNC_END, error);
} }
gpointer
cogl_dma_buf_handle_mmap (CoglDmaBufHandle *dmabuf_handle,
GError **error)
{
size_t size;
gpointer data;
size = dmabuf_handle->height * dmabuf_handle->stride;
data = mmap (NULL, size, PROT_READ, MAP_PRIVATE,
dmabuf_handle->dmabuf_fd,
dmabuf_handle->offset);
if (data == MAP_FAILED)
{
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno),
"mmap failed: %s", g_strerror (errno));
return NULL;
}
return data;
}
gboolean
cogl_dma_buf_handle_munmap (CoglDmaBufHandle *dmabuf_handle,
gpointer data,
GError **error)
{
size_t size;
size = dmabuf_handle->height * dmabuf_handle->stride;
if (munmap (data, size) != 0)
{
g_set_error (error, G_IO_ERROR, g_io_error_from_errno (errno),
"munmap failed: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
CoglFramebuffer * CoglFramebuffer *
cogl_dma_buf_handle_get_framebuffer (CoglDmaBufHandle *dmabuf_handle) cogl_dma_buf_handle_get_framebuffer (CoglDmaBufHandle *dmabuf_handle)
{ {

9
cogl/cogl/cogl-dma-buf-handle.h
View File

@ -71,6 +71,15 @@ COGL_EXPORT gboolean
cogl_dma_buf_handle_sync_read_end (CoglDmaBufHandle *dmabuf_handle, cogl_dma_buf_handle_sync_read_end (CoglDmaBufHandle *dmabuf_handle,
GError **error); GError **error);
COGL_EXPORT gpointer
cogl_dma_buf_handle_mmap (CoglDmaBufHandle *dmabuf_handle,
GError **error);
COGL_EXPORT gboolean
cogl_dma_buf_handle_munmap (CoglDmaBufHandle *dmabuf_handle,
gpointer data,
GError **error);
/** /**
* cogl_dma_buf_handle_get_framebuffer: (skip) * cogl_dma_buf_handle_get_framebuffer: (skip)
* *