From: Gwenole Beauchesne <gwenole.beauche...@intel.com>
---
va/va_vpp.h | 17 +++++++++++++----
1 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/va/va_vpp.h b/va/va_vpp.h
index bde8bef..823d8ab 100644
--- a/va/va_vpp.h
+++ b/va/va_vpp.h
@@ -305,10 +305,11 @@ typedef struct _VAProcFilterValueRange {
/**
* \brief Video processing pipeline configuration.
*
- * This buffers defines a video processing pipeline. As for any buffer
- * passed to \c vaRenderPicture(), this is one-time usage model. However,
- * the actual filters to be applied are provided in the \c filters field,
- * so they can be re-used in other processing pipelines.
+ * This buffer defines a video processing pipeline. As for any buffer
+ * passed to \c vaRenderPicture(), this is a one-time usage model.
+ * However, the actual filters to be applied are provided in the
+ * \c filters field, so they can be re-used in other processing
+ * pipelines.
*
* The target surface is specified by the \c render_target argument of
* \c vaBeginPicture(). The general usage model is described as follows:
@@ -364,6 +365,14 @@ typedef struct _VAProcPipelineParameterBuffer {
* Background color used to fill in pixels that reside outside of the
* specified \ref output_region. The color is specified in ARGB format:
* [31:24] alpha, [23:16] red, [15:8] green, [7:0] blue.
+ *
+ * Unless the alpha value is zero or the \ref output_region represents
+ * the whole target surface size, implementations shall not render the
+ * source surface to the target surface directly. Rather, in order to
+ * maintain the exact semantics of \ref output_background_color, the
+ * driver shall use a temporary surface and fill it in with the
+ * appropriate background color. Next, the driver will blend this
+ * temporary surface into the target surface.
*/
unsigned int output_background_color;
/**
--
1.7.4.1
_______________________________________________
Libva mailing list
Libva@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/libva
