int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
int ok = 0;
if (pic == NULL)
return 0;
WebPEncodingSetError(pic, VP8_ENC_OK); // all ok so far
if (config == NULL) // bad params
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
if (!WebPValidateConfig(config))
return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
if (pic->width <= 0 || pic->height <= 0)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats));
if (!config->lossless) {
VP8Encoder* enc = NULL;
if (pic->y == NULL || pic->u == NULL || pic->v == NULL) {
// Make sure we have YUVA samples.
if (!WebPPictureARGBToYUVA(pic, WEBP_YUV420)) return 0;
}
enc = InitVP8Encoder(config, pic);
if (enc == NULL) return 0; // pic->error is already set.
// Note: each of the tasks below account for 20% in the progress report.
ok = VP8EncAnalyze(enc);
// Analysis is done, proceed to actual coding.
ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel
if (!enc->use_tokens_) {
ok = VP8EncLoop(enc);
} else {
ok = VP8EncTokenLoop(enc);
}
ok = ok && VP8EncFinishAlpha(enc);
#ifdef WEBP_EXPERIMENTAL_FEATURES
ok = ok && VP8EncFinishLayer(enc);
#endif
ok = ok && VP8EncWrite(enc);
StoreStats(enc);
if (!ok) {
VP8EncFreeBitWriters(enc);
}
ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok
} else {
// Make sure we have ARGB samples.
if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) {
return 0;
}
ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem.
}
return ok;
}
int WebPEncode(const WebPConfig* config, WebPPicture* pic) {
int ok = 0;
if (pic == NULL)
return 0;
WebPEncodingSetError(pic, VP8_ENC_OK); // all ok so far
if (config == NULL) // bad params
return WebPEncodingSetError(pic, VP8_ENC_ERROR_NULL_PARAMETER);
if (!WebPValidateConfig(config))
return WebPEncodingSetError(pic, VP8_ENC_ERROR_INVALID_CONFIGURATION);
if (pic->width <= 0 || pic->height <= 0)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
if (pic->width > WEBP_MAX_DIMENSION || pic->height > WEBP_MAX_DIMENSION)
return WebPEncodingSetError(pic, VP8_ENC_ERROR_BAD_DIMENSION);
if (pic->stats != NULL) memset(pic->stats, 0, sizeof(*pic->stats));
if (!config->lossless) {
VP8Encoder* enc = NULL;
if (pic->y == NULL || pic->u == NULL || pic->v == NULL) {
// Make sure we have YUVA samples.
float dithering = 0.f;
if (config->preprocessing & 2) {
const float x = config->quality / 100.f;
const float x2 = x * x;
// slowly decreasing from max dithering at low quality (q->0)
// to 0.5 dithering amplitude at high quality (q->100)
dithering = 1.0f + (0.5f - 1.0f) * x2 * x2;
}
if (!WebPPictureARGBToYUVADithered(pic, WEBP_YUV420, dithering)) {
return 0;
}
}
enc = InitVP8Encoder(config, pic);
if (enc == NULL) return 0; // pic->error is already set.
// Note: each of the tasks below account for 20% in the progress report.
ok = VP8EncAnalyze(enc);
// Analysis is done, proceed to actual coding.
ok = ok && VP8EncStartAlpha(enc); // possibly done in parallel
if (!enc->use_tokens_) {
ok = ok && VP8EncLoop(enc);
} else {
ok = ok && VP8EncTokenLoop(enc);
}
ok = ok && VP8EncFinishAlpha(enc);
ok = ok && VP8EncWrite(enc);
StoreStats(enc);
if (!ok) {
VP8EncFreeBitWriters(enc);
}
ok &= DeleteVP8Encoder(enc); // must always be called, even if !ok
} else {
// Make sure we have ARGB samples.
if (pic->argb == NULL && !WebPPictureYUVAToARGB(pic)) {
return 0;
}
ok = VP8LEncodeImage(config, pic); // Sets pic->error in case of problem.
}
return ok;
}
