Hi Kaaira,
On 14/06/2020 21:02, Kaaira Gupta wrote:
> Currently there is no method to know the correct order of the colors for
> a test image generated by tpg. Write a function that returns a string of
> colors' order given a tpg. It returns a NULL pointer in case of test
> patterns which do not have a well defined colors' order. Hence add a
> NULL check for text in tpg_gen_text().
>
> Signed-off-by: Kaaira Gupta <kgupta@xxxxxxxxxxxxx>
> ---
> drivers/media/common/v4l2-tpg/v4l2-tpg-core.c | 32 +++++++++++++++++--
> include/media/tpg/v4l2-tpg.h | 1 +
> 2 files changed, 31 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c b/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
> index 50f1e0b28b25..c8257e860c6e 100644
> --- a/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
> +++ b/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
> @@ -1959,12 +1959,14 @@ void tpg_gen_text(const struct tpg_data *tpg, u8 *basep[TPG_MAX_PLANES][2],
> unsigned step = V4L2_FIELD_HAS_T_OR_B(tpg->field) ? 2 : 1;
> unsigned div = step;
> unsigned first = 0;
> - unsigned len = strlen(text);
> + unsigned len;
> unsigned p;
>
> - if (font8x16 == NULL || basep == NULL)
> + if (font8x16 == NULL || basep == NULL || text == NULL)
> return;
>
> + len = strlen(text);
> +
> /* Checks if it is possible to show string */
> if (y + 16 >= tpg->compose.height || x + 8 >= tpg->compose.width)
> return;
> @@ -2006,6 +2008,32 @@ void tpg_gen_text(const struct tpg_data *tpg, u8 *basep[TPG_MAX_PLANES][2],
> }
> EXPORT_SYMBOL_GPL(tpg_gen_text);
>
> +char *tpg_g_color_order(const struct tpg_data *tpg)
> +{
> + switch (tpg->pattern) {
> + case TPG_PAT_75_COLORBAR:
> + return "Left to right: white, yellow, cyan, green, magenta, red, blue, black";
> + case TPG_PAT_100_COLORBAR:
> + return "Left to right: white, yellow, cyan, green, magenta, red, blue, black";
> + case TPG_PAT_CSC_COLORBAR:
> + return "Left to right: white, yellow, cyan, green, magenta, red, blue, black";
Those three options return identical strings.
In C you can 'fallthrough' on case statements like this:
> switch (tpg->pattern) {
> case TPG_PAT_75_COLORBAR:
> case TPG_PAT_100_COLORBAR:
> case TPG_PAT_CSC_COLORBAR:
> return "Left to right: white, yellow, cyan, green, magenta, red, blue, black";
So all three of those options will go to the same return statement.
> + case TPG_PAT_100_HCOLORBAR:
> + return "Top to bottom: white, yellow, cyan, green, magenta, red, blue, black";
It would be nice to be able to factor out the common color sequence from
those (two remaining) strings too, as only the direction changes.
But perhaps it's a pain to have to do a string join in this call,
especially given it's static string data otherwise, but that's also a
good reason not to duplicate unnecessarily (as it wastes space in memory).
With those fixed,
Reviewed-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
> + case TPG_PAT_BLACK:
> + return "Black";
> + case TPG_PAT_WHITE:
> + return "White";
> + case TPG_PAT_RED:
> + return "Red";
> + case TPG_PAT_GREEN:
> + return "Green";
> + case TPG_PAT_BLUE:
> + return "Blue";
> + default:
> + return NULL;
> + }
> +}
> +
> void tpg_update_mv_step(struct tpg_data *tpg)
> {
> int factor = tpg->mv_hor_mode > TPG_MOVE_NONE ? -1 : 1;
> diff --git a/include/media/tpg/v4l2-tpg.h b/include/media/tpg/v4l2-tpg.h
> index eb191e85d363..4f79cac87b85 100644
> --- a/include/media/tpg/v4l2-tpg.h
> +++ b/include/media/tpg/v4l2-tpg.h
> @@ -252,6 +252,7 @@ void tpg_fillbuffer(struct tpg_data *tpg, v4l2_std_id std,
> bool tpg_s_fourcc(struct tpg_data *tpg, u32 fourcc);
> void tpg_s_crop_compose(struct tpg_data *tpg, const struct v4l2_rect *crop,
> const struct v4l2_rect *compose);
> +char *tpg_g_color_order(const struct tpg_data *tpg);
>
> static inline void tpg_s_pattern(struct tpg_data *tpg, enum tpg_pattern pattern)
> {
>
--
Regards
--
Kieran
