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Fix static overflow warning.

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In practice, this can never happen because:
- 'streak' is at most as long as a histogram
- 'count' counts the number of streaks

'streak' and 'count' are therefore at most as big as the histogram
length which is at most the max of VP8LHistogramNumCodes,
which is 256+24+(1<<10).

Change-Id: I31c8834543479c8a9260732313ea26b045519515
This commit is contained in:
Vincent Rabaud 2024-08-27 17:06:45 +02:00
parent 615e58744f
commit 8e0cc14c3e
1 changed files with 2 additions and 2 deletions
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4
src/enc/histogram_enc.c
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@ -287,7 +287,7 @@ static uint64_t FinalHuffmanCost(const VP8LStreaks* const stats) {
uint64_t retval = InitialHuffmanCost(); uint64_t retval = InitialHuffmanCost();
// Second coefficient: Many zeros in the histogram are covered efficiently // Second coefficient: Many zeros in the histogram are covered efficiently
// by a run-length encode. Originally 2/8. // by a run-length encode. Originally 2/8.
uint64_t retval_extra = stats->counts[0] * 1600 + 240 * stats->streaks[0][1]; uint32_t retval_extra = stats->counts[0] * 1600 + 240 * stats->streaks[0][1];
// Second coefficient: Constant values are encoded less efficiently, but still // Second coefficient: Constant values are encoded less efficiently, but still
// RLE'ed. Originally 6/8. // RLE'ed. Originally 6/8.
retval_extra += stats->counts[1] * 2640 + 720 * stats->streaks[1][1]; retval_extra += stats->counts[1] * 2640 + 720 * stats->streaks[1][1];
@ -296,7 +296,7 @@ static uint64_t FinalHuffmanCost(const VP8LStreaks* const stats) {
retval_extra += 1840 * stats->streaks[0][0]; retval_extra += 1840 * stats->streaks[0][0];
// Originally 26/8. // Originally 26/8.
retval_extra += 3360 * stats->streaks[1][0]; retval_extra += 3360 * stats->streaks[1][0];
return retval + (retval_extra << (LOG_2_PRECISION_BITS - 10)); return retval + ((uint64_t)retval_extra << (LOG_2_PRECISION_BITS - 10));
} }
// Get the symbol entropy for the distribution 'population'. // Get the symbol entropy for the distribution 'population'.