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scaler_filter - cleanups

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This commit is contained in:
twinaphex 2017-04-16 09:58:42 +02:00
parent 9ee32a4dd6
commit 602ba5d8a6
1 changed files with 19 additions and 28 deletions
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47
libretro-common/gfx/scaler/scaler_filter.c
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@ -43,7 +43,7 @@ static bool allocate_filters(struct scaler_ctx *ctx)
return ctx->horiz.filter && ctx->vert.filter;
}
static void gen_filter_point_sub(struct scaler_filter *filter,
static INLINE void gen_filter_point_sub(struct scaler_filter *filter,
int len, int pos, int step)
{
int i;
@ -79,7 +79,7 @@ static bool gen_filter_point(struct scaler_ctx *ctx)
return true;
}
static void gen_filter_bilinear_sub(struct scaler_filter *filter,
static INLINE void gen_filter_bilinear_sub(struct scaler_filter *filter,
int len, int pos, int step)
{
int i;
@ -114,7 +114,7 @@ static bool gen_filter_bilinear(struct scaler_ctx *ctx)
return true;
}
static void gen_filter_sinc_sub(struct scaler_filter *filter,
static INLINE void gen_filter_sinc_sub(struct scaler_filter *filter,
int len, int pos, int step, double phase_mul)
{
int i, j;
@ -195,22 +195,21 @@ static bool validate_filter(struct scaler_ctx *ctx)
return true;
}
static void fixup_filter_sub(struct scaler_filter *filter, int out_len, int in_len)
static void fixup_filter_sub(struct scaler_filter *filter,
int out_len, int in_len)
{
int i;
int max_pos = in_len - filter->filter_len;
for (i = 0; i < out_len; i++)
{
int postsample = filter->filter_pos[i] - max_pos;
int postsample = filter->filter_pos[i] - max_pos;
int presample = -filter->filter_pos[i];
if (postsample > 0)
{
int16_t *base_filter = NULL;
filter->filter_pos[i] -= postsample;
base_filter = filter->filter + i * filter->filter_stride;
int16_t *base_filter = filter->filter + i * filter->filter_stride;
if (postsample > (int)filter->filter_len)
memset(base_filter, 0, filter->filter_len * sizeof(int16_t));
@ -224,9 +223,8 @@ static void fixup_filter_sub(struct scaler_filter *filter, int out_len, int in_l
if (presample > 0)
{
int16_t *base_filter = NULL;
filter->filter_pos[i] += presample;
base_filter = filter->filter + i * filter->filter_stride;
int16_t *base_filter = filter->filter + i * filter->filter_stride;
if (presample > (int)filter->filter_len)
memset(base_filter, 0, filter->filter_len * sizeof(int16_t));
@ -234,46 +232,39 @@ static void fixup_filter_sub(struct scaler_filter *filter, int out_len, int in_l
{
memmove(base_filter, base_filter + presample,
(filter->filter_len - presample) * sizeof(int16_t));
memset(base_filter + (filter->filter_len - presample), 0, presample * sizeof(int16_t));
memset(base_filter + (filter->filter_len - presample),
0, presample * sizeof(int16_t));
}
}
}
}
/* Makes sure that we never sample outside our rectangle. */
static void fixup_filter(struct scaler_ctx *ctx)
{
fixup_filter_sub(&ctx->horiz, ctx->out_width, ctx->in_width);
fixup_filter_sub(&ctx->vert, ctx->out_height, ctx->in_height);
}
bool scaler_gen_filter(struct scaler_ctx *ctx)
{
bool ret = true;
switch (ctx->scaler_type)
{
case SCALER_TYPE_POINT:
ret = gen_filter_point(ctx);
if (!gen_filter_point(ctx))
return false;
break;
case SCALER_TYPE_BILINEAR:
ret = gen_filter_bilinear(ctx);
if (!gen_filter_bilinear(ctx))
return false;
break;
case SCALER_TYPE_SINC:
ret = gen_filter_sinc(ctx);
if (!gen_filter_sinc(ctx))
return false;
break;
default:
return false;
}
if (!ret)
return false;
fixup_filter(ctx);
/* Makes sure that we never sample outside our rectangle. */
fixup_filter_sub(&ctx->horiz, ctx->out_width, ctx->in_width);
fixup_filter_sub(&ctx->vert, ctx->out_height, ctx->in_height);
return validate_filter(ctx);
}