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swscale/ops: add SwsCompMask and related helpers

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This new type will be used over the following commits to simplify the
codebase.

Signed-off-by: Niklas Haas <git@haasn.dev>
This commit is contained in:
Niklas Haas
2026-03-28 15:21:47 +01:00
parent ce2ca1a186
commit 4020607f0a
2 changed files with 59 additions and 2 deletions
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32
libswscale/ops.c
View File

@@ -133,6 +133,38 @@ const char *ff_sws_op_type_name(SwsOpType op)
return "ERR";
}
SwsCompMask ff_sws_comp_mask_q4(const AVRational q[4])
{
SwsCompMask mask = 0;
for (int i = 0; i < 4; i++) {
if (q[i].den)
mask |= SWS_COMP(i);
}
return mask;
}
SwsCompMask ff_sws_comp_mask_swizzle(const SwsCompMask mask, const SwsSwizzleOp swiz)
{
SwsCompMask res = 0;
for (int i = 0; i < 4; i++) {
const int src = swiz.in[i];
if (SWS_COMP_TEST(mask, src))
res |= SWS_COMP(i);
}
return res;
}
SwsCompMask ff_sws_comp_mask_needed(const SwsOp *op)
{
SwsCompMask mask = 0;
for (int i = 0; i < 4; i++) {
if (SWS_OP_NEEDED(op, i))
mask |= SWS_COMP(i);
}
return mask;
}
/* biased towards `a` */
static AVRational av_min_q(AVRational a, AVRational b)
{

29
libswscale/ops.h
View File

@@ -78,6 +78,27 @@ typedef enum SwsOpType {
const char *ff_sws_op_type_name(SwsOpType op);
/**
* Bit-mask of components. Exact meaning depends on the usage context.
*/
typedef uint8_t SwsCompMask;
enum {
SWS_COMP_NONE = 0,
SWS_COMP_ALL = 0xF,
#define SWS_COMP(X) (1 << (X))
#define SWS_COMP_TEST(mask, X) (!!((mask) & SWS_COMP(X)))
#define SWS_COMP_INV(mask) ((mask) ^ SWS_COMP_ALL)
#define SWS_COMP_ELEMS(N) ((1 << (N)) - 1)
#define SWS_COMP_MASK(X, Y, Z, W) \
(((X) ? SWS_COMP(0) : 0) | \
((Y) ? SWS_COMP(1) : 0) | \
((Z) ? SWS_COMP(2) : 0) | \
((W) ? SWS_COMP(3) : 0))
};
/* Compute SwsCompMask from values with denominator != 0 */
SwsCompMask ff_sws_comp_mask_q4(const AVRational q[4]);
typedef enum SwsCompFlags {
SWS_COMP_GARBAGE = 1 << 0, /* contents are undefined / garbage data */
SWS_COMP_EXACT = 1 << 1, /* value is an exact integer */
@@ -85,8 +106,6 @@ typedef enum SwsCompFlags {
SWS_COMP_SWAPPED = 1 << 3, /* byte order is swapped */
} SwsCompFlags;
#define SWS_OP_NEEDED(op, idx) (!((op)->comps.flags[idx] & SWS_COMP_GARBAGE))
typedef struct SwsComps {
SwsCompFlags flags[4]; /* knowledge about (output) component contents */
bool unused[4]; /* which input components are definitely unused */
@@ -141,6 +160,7 @@ typedef struct SwsSwizzleOp {
} SwsSwizzleOp;
#define SWS_SWIZZLE(X,Y,Z,W) ((SwsSwizzleOp) { .in = {X, Y, Z, W} })
SwsCompMask ff_sws_comp_mask_swizzle(SwsCompMask mask, SwsSwizzleOp swiz);
typedef struct SwsShiftOp {
uint8_t amount; /* number of bits to shift */
@@ -242,6 +262,11 @@ typedef struct SwsOp {
SwsComps comps;
} SwsOp;
#define SWS_OP_NEEDED(op, idx) (!((op)->comps.flags[idx] & SWS_COMP_GARBAGE))
/* Compute SwsCompMask from a mask of needed components */
SwsCompMask ff_sws_comp_mask_needed(const SwsOp *op);
/**
* Describe an operation in human-readable form.
*/