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node-webpmux
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libwebp
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binding.cpp
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#include <stdlib.h> #include <stdio.h> #include <emscripten.h> #include <emscripten/bind.h> #include "libwebp/src/webp/encode.h" #include "libwebp/src/webp/decode.h" using namespace emscripten; class WebPEnc { public: WebPEnc() { this->ready = false; this->picAlloc = false; } ~WebPEnc() { this->reset(); } bool init() { if (this->ready) { return false; } WebPPictureInit(&(this->pic)); WebPMemoryWriterInit(&(this->writer)); this->pic.writer = WebPMemoryWrite; this->pic.custom_ptr = &(this->writer); WebPConfigInit(&(this->config)); this->ready = true; return true; } void reset() { if (!this->ready) { return; } if (this->picAlloc) { WebPPictureFree(&(this->pic)); } WebPMemoryWriterClear(&(this->writer)); this->ready = false; this->picAlloc = false; } // Clunky workaround for Embind not supporting pointers to primitives (first argument should be a const uint8_t *) bool loadRGBA(const int input, int width, int height) { if (!this->ready) { return false; } this->pic.width = width; this->pic.height = height; WebPPictureImportRGBA(&(this->pic), reinterpret_cast<const uint8_t *>(input), width * 4); this->picAlloc = true; return true; } bool setPreset(int en) { if (!this->ready) { return false; } if (en > 0) { WebPConfigPreset(&(this->config), (WebPPreset)en, 100.0f); } else { WebPConfigInit(&(this->config)); } return true; } bool setLosslessPreset(int en) { if (!this->ready) { return false; } if (en > 0) { WebPConfigLosslessPreset(&(this->config), en); this->pic.use_argb = 1; } else { WebPConfigInit(&(this->config)); this->pic.use_argb = 0; } return true; } bool setQuality(float q) { if (!this->ready) { return false; } this->config.quality = q; return true; } bool setMethod(int m) { if (!this->ready) { return false; } this->config.method = m; return true; } bool setExact(bool ex) { if (!this->ready) { return false; } this->config.exact = ex ? 1 : 0; return true; } int encode() { if (!this->ready) { return -1; } if (!WebPValidateConfig(&(this->config))) { return -2; } if (!WebPEncode(&(this->config), &(this->pic))) { return this->pic.error_code; } return 0; } // Clunky workaround for Embind not supporting pointers to primitives (this should return uint8_t*) int getResult() { return (int)this->writer.mem; } size_t getResultSize() { return this->writer.size; } bool advImageHint(int en) { if (!this->ready) { return false; } this->config.image_hint = (WebPImageHint)en; return true; } bool advTargetSize(int s) { if (!this->ready) { return false; } this->config.target_size = s; return true; } bool advTargetPSNR(float psnr) { if (!this->ready) { return false; } this->config.target_PSNR = psnr; return true; } bool advSegments(int seg) { if (!this->ready) { return false; } this->config.segments = seg; return true; } bool advSnsStrength(int str) { if (!this->ready) { return false; } this->config.sns_strength = str; return true; } bool advFilterStrength(int str) { if (!this->ready) { return false; } this->config.filter_strength = str; return true; } bool advFilterSharpness(int shr) { if (!this->ready) { return false; } this->config.filter_sharpness = shr ? 1 : 0; return true; } bool advFilterType(int type) { if (!this->ready) { return false; } this->config.filter_type = type ? 1 : 0; return true; } bool advAutoFilter(int filter) { if (!this->ready) { return false; } this->config.autofilter = filter ? 1 : 0; return true; } bool advAlphaCompression(int comp) { if (!this->ready) { return false; } this->config.alpha_compression = comp; return true; } bool advAlphaFiltering(int filter) { if (!this->ready) { return false; } this->config.alpha_filtering = filter; return true; } bool advAlphaQuality(int qual) { if (!this->ready) { return false; } this->config.alpha_quality = qual; return true; } bool advPass(int pass) { if (!this->ready) { return false; } this->config.pass = pass; return true; } bool advShowCompressed(int comp) { if (!this->ready) { return false; } this->config.show_compressed = comp ? 1 : 0; return true; } bool advPreprocessing(int prepro) { if (!this->ready) { return false; } this->config.preprocessing = prepro; return true; } bool advPartitions(int parts) { if (!this->ready) { return false; } this->config.partitions = parts; return true; } bool advPartitionLimit(int limit) { if (!this->ready) { return false; } this->config.partition_limit = limit; return true; } bool advEmulateJpegSize(int emulate) { if (!this->ready) { return false; } this->config.emulate_jpeg_size = emulate ? 1 : 0; return true; } bool advThreadLevel(int threads) { if (!this->ready) { return false; } this->config.thread_level = threads; return true; } bool advLowMemory(int low) { if (!this->ready) { return false; } this->config.low_memory = low ? 1 : 0; return true; } bool advNearLossless(int near) { if (!this->ready) { return false; } this->config.near_lossless = near; return true; } bool advUseDeltaPalette(int delta) { if (!this->ready) { return false; } this->config.use_delta_palette = 0 /*delta*/; return true; } bool advUseSharpYUV(int sharp) { if (!this->ready) { return false; } this->config.use_sharp_yuv = sharp ? 1 : 0; return true; } bool advQMin(int min) { if (!this->ready) { return false; } this->config.qmin = min; return true; } bool advQMax(int max) { if (!this->ready) { return false; } this->config.qmax = max; return true; } private: bool ready; bool picAlloc; WebPConfig config; WebPPicture pic; WebPMemoryWriter writer; }; // Encoder hooks EMSCRIPTEN_BINDINGS(WebPBinding) { class_<WebPEnc>("WebPEnc") .constructor<>() .function("init", &WebPEnc::init) .function("reset", &WebPEnc::reset) .function("loadRGBA", &WebPEnc::loadRGBA) .function("setPreset", &WebPEnc::setPreset) .function("setLosslessPreset", &WebPEnc::setLosslessPreset) .function("setQuality", &WebPEnc::setQuality) .function("setMethod", &WebPEnc::setMethod) .function("setExact", &WebPEnc::setExact) .function("encode", &WebPEnc::encode) .function("getResult", &WebPEnc::getResult) .function("getResultSize", &WebPEnc::getResultSize) .function("advImageHint", &WebPEnc::advImageHint) .function("advTargetSize", &WebPEnc::advTargetSize) .function("advTargetPSNR", &WebPEnc::advTargetPSNR) .function("advSegments", &WebPEnc::advSegments) .function("advSnsStrength", &WebPEnc::advSnsStrength) .function("advFilterStrength", &WebPEnc::advFilterStrength) .function("advFilterSharpness", &WebPEnc::advFilterSharpness) .function("advFilterType", &WebPEnc::advFilterType) .function("advAutoFilter", &WebPEnc::advAutoFilter) .function("advAlphaCompression", &WebPEnc::advAlphaCompression) .function("advAlphaFiltering", &WebPEnc::advAlphaFiltering) .function("advAlphaQuality", &WebPEnc::advAlphaQuality) .function("advPass", &WebPEnc::advPass) .function("advShowCompressed", &WebPEnc::advShowCompressed) .function("advPreprocessing", &WebPEnc::advPreprocessing) .function("advPartitions", &WebPEnc::advPartitions) .function("advPartitionLimit", &WebPEnc::advPartitionLimit) .function("advEmulateJpegSize", &WebPEnc::advEmulateJpegSize) .function("advThreadLevel", &WebPEnc::advThreadLevel) .function("advLowMemory", &WebPEnc::advLowMemory) .function("advNearLossless", &WebPEnc::advNearLossless) .function("advUseDeltaPalette", &WebPEnc::advUseDeltaPalette) .function("advUseSharpYUV", &WebPEnc::advUseSharpYUV) .function("advQMin", &WebPEnc::advQMin) .function("advQMax", &WebPEnc::advQMax); } extern "C" { // Decoder EMSCRIPTEN_KEEPALIVE uint8_t *decodeRGBA(const uint8_t *data, size_t dataSize) { return WebPDecodeRGBA(data, dataSize, 0, 0); } EMSCRIPTEN_KEEPALIVE void decodeFree(uint8_t *data) { WebPFree(data); } // Utility EMSCRIPTEN_KEEPALIVE uint8_t *allocBuffer(size_t size) { return (uint8_t*)malloc(size * sizeof(uint8_t)); } EMSCRIPTEN_KEEPALIVE void destroyBuffer(uint8_t *p) { free(p); } }