WebPMuxError WebPMuxSetImage(WebPMux* mux, const WebPData* bitstream,
int copy_data) {
WebPMuxImage wpi;
WebPMuxError err;
// Sanity checks.
if (mux == NULL || bitstream == NULL || bitstream->bytes == NULL ||
bitstream->size > MAX_CHUNK_PAYLOAD) {
return WEBP_MUX_INVALID_ARGUMENT;
}
if (mux->images_ != NULL) {
// Only one 'simple image' can be added in mux. So, remove present images.
MuxImageDeleteAll(&mux->images_);
}
MuxImageInit(&wpi);
err = SetAlphaAndImageChunks(bitstream, copy_data, &wpi);
if (err != WEBP_MUX_OK) goto Err;
// Add this WebPMuxImage to mux.
err = MuxImagePush(&wpi, &mux->images_);
if (err != WEBP_MUX_OK) goto Err;
// All is well.
return WEBP_MUX_OK;
Err: // Something bad happened.
MuxImageRelease(&wpi);
return err;
}
static void MuxRelease(WebPMux* const mux) {
if (mux == NULL) return;
MuxImageDeleteAll(&mux->images_);
DeleteAllChunks(&mux->vp8x_);
DeleteAllChunks(&mux->iccp_);
DeleteAllChunks(&mux->loop_);
DeleteAllChunks(&mux->meta_);
DeleteAllChunks(&mux->unknown_);
}
WebPMuxError WebPMuxSetImage(WebPMux* mux,
const WebPData* bitstream, int copy_data) {
WebPMuxError err;
WebPChunk chunk;
WebPMuxImage wpi;
WebPData image;
WebPData alpha;
int is_lossless;
int image_tag;
if (mux == NULL || bitstream == NULL || bitstream->bytes_ == NULL ||
bitstream->size_ > MAX_CHUNK_PAYLOAD) {
return WEBP_MUX_INVALID_ARGUMENT;
}
// If given data is for a whole webp file,
// extract only the VP8/VP8L data from it.
err = GetImageData(bitstream, &image, &alpha, &is_lossless);
if (err != WEBP_MUX_OK) return err;
image_tag = is_lossless ? kChunks[IDX_VP8L].tag : kChunks[IDX_VP8].tag;
// Delete the existing images.
MuxImageDeleteAll(&mux->images_);
MuxImageInit(&wpi);
if (alpha.bytes_ != NULL) { // Add alpha chunk.
ChunkInit(&chunk);
err = ChunkAssignData(&chunk, &alpha, copy_data, kChunks[IDX_ALPHA].tag);
if (err != WEBP_MUX_OK) goto Err;
err = ChunkSetNth(&chunk, &wpi.alpha_, 1);
if (err != WEBP_MUX_OK) goto Err;
}
// Add image chunk.
ChunkInit(&chunk);
err = ChunkAssignData(&chunk, &image, copy_data, image_tag);
if (err != WEBP_MUX_OK) goto Err;
err = ChunkSetNth(&chunk, &wpi.img_, 1);
if (err != WEBP_MUX_OK) goto Err;
// Add this image to mux.
err = MuxImagePush(&wpi, &mux->images_);
if (err != WEBP_MUX_OK) goto Err;
// All OK.
return WEBP_MUX_OK;
Err:
// Something bad happened.
ChunkRelease(&chunk);
MuxImageRelease(&wpi);
return err;
}
WebPMuxError WebPMuxDeleteImage(WebPMux* mux) {
WebPMuxError err;
if (mux == NULL) return WEBP_MUX_INVALID_ARGUMENT;
err = MuxValidateForImage(mux);
if (err != WEBP_MUX_OK) return err;
// All well, delete image.
MuxImageDeleteAll(&mux->images_);
return WEBP_MUX_OK;
}