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Make the lossless predictors work on a batch of pixels.

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Change-Id: Ieaee34f1f97c375b9e97ef7e9df60aed353dffa1
This commit is contained in:
Vincent Rabaud
2016-11-28 17:12:05 +01:00
parent bc18ebad2e
commit 4239a1489c
8 changed files with 236 additions and 105 deletions
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28
src/dsp/lossless_common.h
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@ -174,6 +174,34 @@ uint32_t VP8LSubPixels(uint32_t a, uint32_t b) {
}
//------------------------------------------------------------------------------
// Transform-related functions use din both encoding and decoding.
// Macros used to create a batch predictor that iteratively uses a
// one-pixel predictor.
// The predictor is added to the output pixel (which
// is therefore considered as a residual) to get the final prediction.
#define GENERATE_PREDICTOR_ADD(X) \
static void PredictorAdd##X(const uint32_t* in, const uint32_t* upper, \
int num_pixels, uint32_t* out) { \
int x; \
for (x = 0; x < num_pixels; ++x) { \
const uint32_t pred = VP8LPredictors[(X)](out[x - 1], upper + x); \
out[x] = VP8LAddPixels(in[x], pred); \
} \
}
// It subtracts the prediction from the input pixel and stores the residual
// in the output pixel.
#define GENERATE_PREDICTOR_SUB(X) \
static void PredictorSub##X(const uint32_t* in, const uint32_t* upper, \
int num_pixels, uint32_t* out) { \
int x; \
for (x = 0; x < num_pixels; ++x) { \
const uint32_t pred = VP8LPredictors[(X)](in[x - 1], upper + x); \
out[x] = VP8LSubPixels(in[x], pred); \
} \
}
#ifdef __cplusplus
} // extern "C"