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add EXPERIMENTAL code for YUV-JPEG colorspace

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This is mostly for experimentation!
Need to define USE_YUVj flag in the code for that.

suggested by benwreder at hotmail dot com

Change-Id: If0b8e2c1863efc08ce097de6de20f4c7efc3f7e8
This commit is contained in:
skal
2012-10-18 14:55:39 +02:00
parent c3aa215afa
commit f0360b4fcf
2 changed files with 61 additions and 8 deletions
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15
src/dsp/yuv.c
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@ -33,6 +33,7 @@ void VP8YUVInit(void) {
if (done) {
return;
}
#ifndef USE_YUVj
for (i = 0; i < 256; ++i) {
VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
@ -44,6 +45,20 @@ void VP8YUVInit(void) {
VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
}
#else
for (i = 0; i < 256; ++i) {
VP8kVToR[i] = (91881 * (i - 128) + YUV_HALF) >> YUV_FIX;
VP8kUToG[i] = -22554 * (i - 128) + YUV_HALF;
VP8kVToG[i] = -46802 * (i - 128);
VP8kUToB[i] = (116130 * (i - 128) + YUV_HALF) >> YUV_FIX;
}
for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
const int k = i;
VP8kClip[i - YUV_RANGE_MIN] = clip(k, 255);
VP8kClip4Bits[i - YUV_RANGE_MIN] = clip((k + 8) >> 4, 15);
}
#endif
done = 1;
}