static WebPMux* DuplicateMuxHeader(const WebPMux* const mux) {
WebPMux* new_mux = WebPMuxNew();
WebPMuxAnimParams p;
WebPMuxError err;
int i;
int ok = 1;
if (new_mux == NULL) return NULL;
err = WebPMuxGetAnimationParams(mux, &p);
if (err == WEBP_MUX_OK) {
err = WebPMuxSetAnimationParams(new_mux, &p);
if (err != WEBP_MUX_OK) {
ERROR_GOTO2("Error (%s) handling animation params.\n",
ErrorString(err), End);
}
} else {
/* it might not be an animation. Just keep moving. */
}
for (i = 1; i <= 3; ++i) {
WebPData metadata;
err = WebPMuxGetChunk(mux, kFourccList[i], &metadata);
if (err == WEBP_MUX_OK && metadata.size > 0) {
err = WebPMuxSetChunk(new_mux, kFourccList[i], &metadata, 1);
if (err != WEBP_MUX_OK) {
ERROR_GOTO1("Error transferring metadata in DuplicateMux().", End);
}
}
}
End:
if (!ok) {
WebPMuxDelete(new_mux);
new_mux = NULL;
}
return new_mux;
}
/* Save an animation to disk */
gboolean save_animation(gint32 nLayers,
gint32 *allLayers,
FILE *outfile,
WebPSaveParams *params,
GError **error)
{
gboolean status = FALSE;
gboolean innerStatus = TRUE;
WebPAnimEncoderOptions enc_options;
WebPAnimEncoder *enc = NULL;
int frame_timestamp = 0;
WebPData webp_data = {0};
WebPMux *mux;
WebPMuxAnimParams anim_params = {0};
/* Prepare for encoding an animation */
WebPAnimEncoderOptionsInit(&enc_options);
do {
int i;
gint32 drawable_ID = allLayers[0];
/* Create the encoder */
enc = WebPAnimEncoderNew(gimp_drawable_width(drawable_ID),
gimp_drawable_height(drawable_ID),
&enc_options);
/* Encode each layer */
for (i = 0; i < nLayers; i++) {
if ((innerStatus = save_layer(allLayers[i],
NULL,
NULL,
TRUE,
enc,
frame_timestamp,
params,
error)) == FALSE) {
break;
}
}
/* Check to make sure each layer was encoded correctly */
if (innerStatus == FALSE) {
break;
}
/* Add NULL frame */
WebPAnimEncoderAdd(enc, NULL, frame_timestamp, NULL);
/* Initialize the WebP image structure */
WebPDataInit(&webp_data);
/* Write the animation to the image */
if (!WebPAnimEncoderAssemble(enc, &webp_data)) {
g_set_error(error,
G_FILE_ERROR,
0,
"Encoding error: '%s'",
WebPAnimEncoderGetError(enc));
break;
}
/* Create a Mux */
mux = WebPMuxCreate(&webp_data, 1);
/* Set animation parameters */
anim_params.loop_count = params->loop == TRUE ? 0 : 1;
WebPMuxSetAnimationParams(mux, &anim_params);
/* Assemble the image */
WebPMuxAssemble(mux, &webp_data);
/* Write to disk */
if (fwrite(webp_data.bytes, webp_data.size, 1, outfile) != 1) {
break;
}
/* Everything succeeded */
status = TRUE;
} while(0);
/* Free image data */
WebPDataClear(&webp_data);
/* Free the animation encoder */
if (enc) {
WebPAnimEncoderDelete(enc);
}
return status;
}
