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Added image characteristic hint for the codec.

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This image type hint is used by codec to apply appropriate set of
transform filters to the image.

Change-Id: Ibb24e47ba14c40fa7f9f2c50ae86e03f2b29e9a6
This commit is contained in:
Vikas Arora
2012-06-22 12:14:48 +05:30
parent e8a0a821d2
commit d373076a53
5 changed files with 44 additions and 8 deletions
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3
src/enc/config.c
View File

@ -45,6 +45,7 @@ int WebPConfigInitInternal(WebPConfig* const config,
config->alpha_filtering = 1;
config->alpha_quality = 100;
config->lossless = 0;
config->image_hint = WEBP_HINT_DEFAULT;
// TODO(skal): tune.
switch (preset) {
@ -119,6 +120,8 @@ int WebPValidateConfig(const WebPConfig* const config) {
return 0;
if (config->lossless < 0 || config->lossless > 1)
return 0;
if (config->image_hint > WEBP_HINT_PHOTO)
return 0;
return 1;
}

21
src/enc/vp8l.c
View File

@ -139,19 +139,24 @@ static int AnalyzeEntropy(const WebPPicture* const pic,
return 1;
}
static int VP8LEncAnalyze(VP8LEncoder* const enc) {
static int VP8LEncAnalyze(VP8LEncoder* const enc, WebPImageHint image_hint) {
const WebPPicture* const pic = enc->pic_;
assert(pic != NULL && pic->argb != NULL);
enc->use_palette_ =
AnalyzeAndCreatePalette(pic, enc->palette_, &enc->palette_size_);
AnalyzeAndCreatePalette(pic, enc->palette_, &enc->palette_size_);
if (!enc->use_palette_) {
double non_pred_entropy, pred_entropy;
if (!AnalyzeEntropy(pic, &non_pred_entropy, &pred_entropy)) {
return 0;
}
if (image_hint == WEBP_HINT_DEFAULT) {
double non_pred_entropy, pred_entropy;
if (!AnalyzeEntropy(pic, &non_pred_entropy, &pred_entropy)) {
return 0;
}
if (pred_entropy < 0.95 * non_pred_entropy) {
if (pred_entropy < 0.95 * non_pred_entropy) {
enc->use_predict_ = 1;
enc->use_cross_color_ = 1;
}
} else if (image_hint == WEBP_HINT_PHOTO) {
enc->use_predict_ = 1;
enc->use_cross_color_ = 1;
}
@ -945,7 +950,7 @@ WebPEncodingError VP8LEncodeStream(const WebPConfig* const config,
// ---------------------------------------------------------------------------
// Analyze image (entropy, num_palettes etc)
if (!VP8LEncAnalyze(enc)) {
if (!VP8LEncAnalyze(enc, config->image_hint)) {
err = VP8_ENC_ERROR_OUT_OF_MEMORY;
goto Error;
}