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follow-up: clean up WebPRescalerXXX dsp function

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by removing redundant RFIX macros and using a plain-C fallback.

Change-Id: I52436c672bf20780b6fe3bcf43fe73e1abac10ff
This commit is contained in:
Pascal Massimino
2015-01-10 06:46:00 -08:00
committed by James Zern
parent f8740f0d6c
commit d581ba40ba
4 changed files with 19 additions and 38 deletions
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27
src/dsp/rescaler_mips_dsp_r2.c
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@ -110,19 +110,16 @@ static void ImportRow(WebPRescaler* const wrk,
}
}
#define RFIX 30
#define MULT_FIX(x, y) (((int64_t)(x) * (y) + (1 << (RFIX - 1))) >> RFIX)
static void ExportRow(WebPRescaler* const wrk, int x_out) {
if (wrk->y_accum <= 0) {
uint8_t* dst = wrk->dst;
int32_t* irow = wrk->irow;
const int32_t* frow = wrk->frow;
const int yscale = wrk->fy_scale * (-wrk->y_accum);
const int x_out_max = wrk->dst_width * wrk->num_channels;
// if wrk->fxy_scale can fit into 32 bits use optimized code,
// otherwise use C code
if ((wrk->fxy_scale >> 32) == 0) {
uint8_t* dst = wrk->dst;
int32_t* irow = wrk->irow;
const int32_t* frow = wrk->frow;
const int yscale = wrk->fy_scale * (-wrk->y_accum);
const int x_out_max = wrk->dst_width * wrk->num_channels;
int temp0, temp1, temp3, temp4, temp5, temp6, temp7;
const int temp2 = (int)wrk->fxy_scale;
const int rest = (x_out_max - x_out) & 1;
@ -190,22 +187,14 @@ static void ExportRow(WebPRescaler* const wrk, int x_out) {
[rest]"r"(rest)
: "memory", "hi", "lo"
);
wrk->y_accum += wrk->y_add;
wrk->dst += wrk->dst_stride;
} else {
for (; x_out < x_out_max; ++x_out) {
const int frac = (int)MULT_FIX(frow[x_out], yscale);
const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale);
dst[x_out] = (!(v & ~0xff)) ? v : (v < 0) ? 0 : 255;
irow[x_out] = frac; // new fractional start
}
WebPRescalerExportRowC(wrk, x_out);
}
wrk->y_accum += wrk->y_add;
wrk->dst += wrk->dst_stride;
}
}
#undef MULT_FIX
#undef RFIX
#endif // WEBP_USE_MIPS_DSP_R2
//------------------------------------------------------------------------------