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add stats for lossless

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* Extend AuxStats with new fields
  it's slightly ABI-incompatible, but i guess it's ok for 0.1.99+
  I expect to add more stats later, possibly (predictor stats, etc.)
* Have cwebp report the features used by lossless
  compression (either for alpha or full lossless coding)
* Print the PSNR for alpha (useful in case of -alpha_q)
* clean-up alpha.c signatures
+ misc cleanup (added const '* const ptr', etc.)

Change-Id: I157a21581f1793cb0c6cc0882e7b0a2dde68a970
This commit is contained in:
Pascal Massimino
2012-07-24 16:15:36 -07:00
parent d39177b74c
commit 7d853d79dc
7 changed files with 143 additions and 75 deletions
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37
examples/cwebp.c
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@ -614,6 +614,25 @@ static void PrintValues(const int values[4]) {
fprintf(stderr, "|\n");
}
static void PrintFullLosslessInfo(const WebPAuxStats* const stats,
const char* const description) {
fprintf(stderr, "Lossless-%s compressed size: %d bytes\n",
description, stats->lossless_size);
if (stats->lossless_features) {
fprintf(stderr, " * Lossless features used:");
if (stats->lossless_features & 1) fprintf(stderr, " PREDICTION");
if (stats->lossless_features & 2) fprintf(stderr, " CROSS-COLOR-TRANSFORM");
if (stats->lossless_features & 4) fprintf(stderr, " SUBTRACT-GREEN");
if (stats->lossless_features & 8) fprintf(stderr, " PALETTE");
fprintf(stderr, "\n");
}
fprintf(stderr, " * Precision Bits: histogram=%d transform=%d cache=%d\n",
stats->histogram_bits, stats->transform_bits, stats->cache_bits);
if (stats->palette_size > 0) {
fprintf(stderr, " * Palette size: %d\n", stats->palette_size);
}
}
static void PrintExtraInfoLossless(const WebPPicture* const pic,
int short_output,
const char* const file_name) {
@ -624,6 +643,7 @@ static void PrintExtraInfoLossless(const WebPPicture* const pic,
fprintf(stderr, "File: %s\n", file_name);
fprintf(stderr, "Dimension: %d x %d\n", pic->width, pic->height);
fprintf(stderr, "Output: %d bytes\n", stats->coded_size);
PrintFullLosslessInfo(stats, "ARGB");
}
}
@ -658,9 +678,9 @@ static void PrintExtraInfoLossy(const WebPPicture* const pic, int short_output,
100.f * stats->header_bytes[0] / stats->coded_size,
stats->header_bytes[1],
100.f * stats->header_bytes[1] / stats->coded_size);
if (stats->alpha_data_size) {
fprintf(stderr, " transparency: %6d\n",
stats->alpha_data_size);
if (stats->alpha_data_size > 0) {
fprintf(stderr, " transparency: %6d (%.1f dB)\n",
stats->alpha_data_size, stats->PSNR[4]);
}
if (stats->layer_data_size) {
fprintf(stderr, " enhancement: %6d\n",
@ -686,8 +706,11 @@ static void PrintExtraInfoLossy(const WebPPicture* const pic, int short_output,
fprintf(stderr, " segments total: ");
PrintByteCount(totals, stats->coded_size, NULL);
}
if (stats->lossless_size > 0) {
PrintFullLosslessInfo(stats, "alpha");
}
}
if (pic->extra_info) {
if (pic->extra_info != NULL) {
const int mb_w = (pic->width + 15) / 16;
const int mb_h = (pic->height + 15) / 16;
const int type = pic->extra_info_type;
@ -1100,8 +1123,10 @@ int main(int argc, const char *argv[]) {
fprintf(stderr, "be performed, but its results discarded.\n\n");
}
}
picture.stats = &stats;
stats.user_data = (void*)in_file;
if (!quiet) {
picture.stats = &stats;
stats.user_data = (void*)in_file;
}
// Compress
if (verbose) {