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swscale: fix off-by-one in second coefficient in bilinear filters.

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If coefficient A is 12-bits xixed-point number "X", then the other
coefficient is (1 << 12) - X, not (1 << 12) - X - 1.
This commit is contained in:
Ronald S. Bultje 2012-04-13 14:37:47 -07:00
parent 7bf9e3391f
commit 4860625236
1 changed files with 7 additions and 7 deletions
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14
libswscale/output.c
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@ -353,7 +353,7 @@ yuv2mono_2_c_template(SwsContext *c, const int16_t *buf[2],
{ {
const int16_t *buf0 = buf[0], *buf1 = buf[1]; const int16_t *buf0 = buf[0], *buf1 = buf[1];
const uint8_t * const d128 = dither_8x8_220[y & 7]; const uint8_t * const d128 = dither_8x8_220[y & 7];
int yalpha1 = 4095 - yalpha; int yalpha1 = 4096 - yalpha;
int i; int i;
for (i = 0; i < dstW; i += 8) { for (i = 0; i < dstW; i += 8) {
@ -505,8 +505,8 @@ yuv2422_2_c_template(SwsContext *c, const int16_t *buf[2],
const int16_t *buf0 = buf[0], *buf1 = buf[1], const int16_t *buf0 = buf[0], *buf1 = buf[1],
*ubuf0 = ubuf[0], *ubuf1 = ubuf[1], *ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
*vbuf0 = vbuf[0], *vbuf1 = vbuf[1]; *vbuf0 = vbuf[0], *vbuf1 = vbuf[1];
int yalpha1 = 4095 - yalpha; int yalpha1 = 4096 - yalpha;
int uvalpha1 = 4095 - uvalpha; int uvalpha1 = 4096 - uvalpha;
int i; int i;
for (i = 0; i < ((dstW + 1) >> 1); i++) { for (i = 0; i < ((dstW + 1) >> 1); i++) {
@ -648,8 +648,8 @@ yuv2rgb48_2_c_template(SwsContext *c, const int32_t *buf[2],
const int32_t *buf0 = buf[0], *buf1 = buf[1], const int32_t *buf0 = buf[0], *buf1 = buf[1],
*ubuf0 = ubuf[0], *ubuf1 = ubuf[1], *ubuf0 = ubuf[0], *ubuf1 = ubuf[1],
*vbuf0 = vbuf[0], *vbuf1 = vbuf[1]; *vbuf0 = vbuf[0], *vbuf1 = vbuf[1];
int yalpha1 = 4095 - yalpha; int yalpha1 = 4096 - yalpha;
int uvalpha1 = 4095 - uvalpha; int uvalpha1 = 4096 - uvalpha;
int i; int i;
for (i = 0; i < ((dstW + 1) >> 1); i++) { for (i = 0; i < ((dstW + 1) >> 1); i++) {
@ -995,8 +995,8 @@ yuv2rgb_2_c_template(SwsContext *c, const int16_t *buf[2],
*vbuf0 = vbuf[0], *vbuf1 = vbuf[1], *vbuf0 = vbuf[0], *vbuf1 = vbuf[1],
*abuf0 = hasAlpha ? abuf[0] : NULL, *abuf0 = hasAlpha ? abuf[0] : NULL,
*abuf1 = hasAlpha ? abuf[1] : NULL; *abuf1 = hasAlpha ? abuf[1] : NULL;
int yalpha1 = 4095 - yalpha; int yalpha1 = 4096 - yalpha;
int uvalpha1 = 4095 - uvalpha; int uvalpha1 = 4096 - uvalpha;
int i; int i;
for (i = 0; i < ((dstW + 1) >> 1); i++) { for (i = 0; i < ((dstW + 1) >> 1); i++) {