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perform two idct transforms at a time when possible

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patch by Christian Duvivier (cduvivier at google dot com)
This commit is contained in:
Pascal Massimino
2011-06-20 00:22:37 -07:00
parent 01af7b69cd
commit 96ed9ce0fb
4 changed files with 62 additions and 21 deletions
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17
src/dec/dsp.c
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@ -62,7 +62,7 @@ static const int kC1 = 20091 + (1 << 16);
static const int kC2 = 35468;
#define MUL(a, b) (((a) * (b)) >> 16)
static void Transform(const int16_t* in, uint8_t* dst) {
static void TransformOne(const int16_t* in, uint8_t* dst) {
int C[4 * 4], *tmp;
int i;
tmp = C;
@ -102,11 +102,16 @@ static void Transform(const int16_t* in, uint8_t* dst) {
}
#undef MUL
static void TransformTwo(const int16_t* in, uint8_t* dst, int do_two) {
TransformOne(in, dst);
if (do_two) {
TransformOne(in + 16, dst + 4);
}
}
static void TransformUV(const int16_t* in, uint8_t* dst) {
VP8Transform(in + 0 * 16, dst);
VP8Transform(in + 1 * 16, dst + 4);
VP8Transform(in + 2 * 16, dst + 4 * BPS);
VP8Transform(in + 3 * 16, dst + 4 * BPS + 4);
VP8Transform(in + 0 * 16, dst, 1);
VP8Transform(in + 2 * 16, dst + 4 * BPS, 1);
}
static void TransformDC(const int16_t *in, uint8_t* dst) {
@ -129,7 +134,7 @@ static void TransformDCUV(const int16_t* in, uint8_t* dst) {
#undef STORE
// default C implementations:
VP8Idct VP8Transform = Transform;
VP8Idct2 VP8Transform = TransformTwo;
VP8Idct VP8TransformUV = TransformUV;
VP8Idct VP8TransformDC = TransformDC;
VP8Idct VP8TransformDCUV = TransformDCUV;