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gbm: Introduce a helper function for printing GBM format names.

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This requires that the caller make a little (stack) allocation to store
the string.

v2: Use gbm_format_canonicalize (suggested by Daniel)

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Eric Anholt 2018-11-02 14:35:06 -07:00
parent ee7f848c00
commit 6328536ff2
2 changed files with 26 additions and 0 deletions
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20
src/gbm/main/gbm.c
View file

@ -711,3 +711,23 @@ gbm_format_canonicalize(uint32_t gbm_format)
return gbm_format;
}
}
/**
* Returns a string representing the fourcc format name.
*
* \param desc Caller-provided storage for the format name string.
* \return String containing the fourcc of the format.
*/
GBM_EXPORT char *
gbm_format_get_name(uint32_t gbm_format, struct gbm_format_name_desc *desc)
{
gbm_format = gbm_format_canonicalize(gbm_format);
desc->name[0] = gbm_format;
desc->name[1] = gbm_format >> 8;
desc->name[2] = gbm_format >> 16;
desc->name[3] = gbm_format >> 24;
desc->name[4] = 0;
return desc->name;
}

6
src/gbm/main/gbm.h
View file

@ -190,6 +190,9 @@ enum gbm_bo_format {
#define GBM_FORMAT_YUV444 __gbm_fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */
#define GBM_FORMAT_YVU444 __gbm_fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */
struct gbm_format_name_desc {
char name[5];
};
/**
* Flags to indicate the intended use for the buffer - these are passed into
@ -399,6 +402,9 @@ gbm_surface_has_free_buffers(struct gbm_surface *surface);
void
gbm_surface_destroy(struct gbm_surface *surface);
char *
gbm_format_get_name(uint32_t gbm_format, struct gbm_format_name_desc *desc);
#ifdef __cplusplus
}
#endif