[Mesa-dev] [PATCH v2 1/8] __DRIimage: version 5, add new formats and createSubImage

Kristian Høgsberg krh at bitplanet.net
Mon Jul 9 14:03:47 PDT 2012

The additions in version 5 enables creating EGLImages for different planes
of a YUV buffer.  createImageFromName is still used to create the containing
__DRIimage, and createSubImage can then be used no that __DRIimage to create
__DRIimages that correspond to the y, u, and v planes (__DRI_IMAGE_FORMAT_R8)
or the uv planes (__DRI_IMAGE_FORMAT_RG88) for formats such as NV12 where
the u and v components are interleaved.  Packed formats such as YUYV etc
doesn't require any special treatment, we just sample those as a regular
ARGB texture.

Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
 include/GL/internal/dri_interface.h |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index e37917e..08c1886 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -901,12 +901,19 @@ struct __DRIdri2ExtensionRec {
  * tokens, except in the native endian of the CPU.  For example, on
  * little endian __DRI_IMAGE_FORMAT_XRGB8888 corresponds to
  * MESA_FORMAT_XRGB8888, but MESA_FORMAT_XRGB8888_REV on big endian.
+ *
+ * __DRI_IMAGE_FORMAT_NONE is for images that aren't directly usable
+ * by the driver (YUV planar formats) but serve as a base image for
+ * creating sub-images for the different planes within the image.
 #define __DRI_IMAGE_FORMAT_RGB565       0x1001
 #define __DRI_IMAGE_FORMAT_XRGB8888     0x1002
 #define __DRI_IMAGE_FORMAT_ARGB8888     0x1003
 #define __DRI_IMAGE_FORMAT_ABGR8888     0x1004
 #define __DRI_IMAGE_FORMAT_XBGR8888     0x1005
+#define __DRI_IMAGE_FORMAT_R8           0x1006 /* Since version 5 */
+#define __DRI_IMAGE_FORMAT_GR88         0x1007
+#define __DRI_IMAGE_FORMAT_NONE         0x1008
 #define __DRI_IMAGE_USE_SHARE		0x0001
 #define __DRI_IMAGE_USE_SCANOUT		0x0002
@@ -963,6 +970,26 @@ struct __DRIimageExtensionRec {
     * \since 4
    int (*write)(__DRIimage *image, const void *buf, size_t count);
+   /**
+    * Create an image out of a sub-region of a parent image.  This
+    * entry point lets us create individual __DRIimages for different
+    * planes in a planar buffer (typically yuv), for example.  While a
+    * sub-image shares the underlying buffer object with the parent
+    * image and other sibling sub-images, the life times of parent and
+    * sub-images are not dependent.  Destroying the parent or a
+    * sub-image doesn't affect other images.  The underlying buffer
+    * object is free when no __DRIimage remains that references it.
+    *
+    * Sub-images may overlap, but rendering to overlapping sub-images
+    * is undefined.
+    *
+    * \since 5
+    */
+    __DRIimage *(*createSubImage)(__DRIimage *image,
+                                  int width, int height, int format,
+                                  int offset, int pitch,
+                                  void *loaderPrivate);

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