add the buffer clear helper function

Change-Id: Id9b20d38b3d1558d0a59db30b7ec302775f2f943

diff --git a/include/tdm_helper.h b/include/tdm_helper.h
index d526981..7342e5d 100644 (file)
--- a/include/tdm_helper.h
+++ b/include/tdm_helper.h
@@ -69,6 +69,23 @@ void
 tdm_helper_dump_buffer(tbm_surface_h buffer, const char *file);
 
 /**
+ * @brief fill a buffer with 0.
+ * @details
+ * This function supports only if a buffer has below formats.
+ * - TBM_FORMAT_ARGB8888
+ * - TBM_FORMAT_XRGB8888
+ * - TBM_FORMAT_YVU420
+ * - TBM_FORMAT_YUV420
+ * - TBM_FORMAT_NV12
+ * - TBM_FORMAT_NV21
+ * - TBM_FORMAT_YUYV
+ * - TBM_FORMAT_UYVY
+ * @param[in] buffer A TDM buffer
+ */
+void
+tdm_helper_clear_buffer(tbm_surface_h buffer);
+
+/**
  * @brief Get a fd from the given enviroment variable.
  * @details
  * This function will dup the fd of the given enviroment variable. The Caller

diff --git a/src/tdm_helper.c b/src/tdm_helper.c
index f2955ec..92d7545 100644 (file)
--- a/src/tdm_helper.c
+++ b/src/tdm_helper.c
@@ -265,6 +265,57 @@ tdm_helper_dump_buffer(tbm_surface_h buffer, const char *file)
        TDM_INFO("dump %s", file);
 }
 
+EXTERN void
+tdm_helper_clear_buffer(tbm_surface_h buffer)
+{
+       tbm_surface_info_s info;
+       int ret;
+
+       TDM_RETURN_IF_FAIL(buffer != NULL);
+
+       ret = tbm_surface_map(buffer, TBM_OPTION_READ, &info);
+       TDM_RETURN_IF_FAIL(ret == TBM_SURFACE_ERROR_NONE);
+
+       switch (info.format) {
+       case TBM_FORMAT_ARGB8888:
+       case TBM_FORMAT_XRGB8888:
+               memset(info.planes[0].ptr, 0, info.planes[0].stride * info.height);
+               break;
+       case TBM_FORMAT_YVU420:
+       case TBM_FORMAT_YUV420:
+               memset((char*)info.planes[0].ptr, 0x10, info.planes[0].stride * info.height);
+               memset((char*)info.planes[1].ptr, 0x80, info.planes[1].stride * (info.height >> 1));
+               memset((char*)info.planes[2].ptr, 0x80, info.planes[2].stride * (info.height >> 1));
+               break;
+       case TBM_FORMAT_NV12:
+       case TBM_FORMAT_NV21:
+               memset((char*)info.planes[0].ptr, 0x10, info.planes[0].stride * info.height);
+               memset((char*)info.planes[1].ptr, 0x80, info.planes[1].stride * (info.height >> 1));
+               break;
+       case TBM_FORMAT_YUYV: {
+               int *ibuf = (int*)info.planes[0].ptr;
+               int i, size = info.planes[0].stride * info.height / 4;
+
+               for (i = 0 ; i < size ; i++)
+                       ibuf[i] = 0x10801080;
+       }
+       break;
+       case TBM_FORMAT_UYVY: {
+               int *ibuf = (int*)info.planes[0].ptr;
+               int i, size = info.planes[0].stride * info.height / 4;
+
+               for (i = 0 ; i < size ; i++)
+                       ibuf[i] = 0x80108010; /* YUYV -> 0xVYUY */
+       }
+       break;
+       default:
+               TDM_ERR("can't clear %c%c%c%c buffer", FOURCC_STR(info.format));
+               break;
+       }
+
+       tbm_surface_unmap(buffer);
+}
+
 EXTERN int
 tdm_helper_get_fd(const char *env)
 {