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add lossless webp encoding

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Green Sky
2025-04-07 16:18:32 +02:00
parent 923dbed53d
commit 4ca3048988
2 changed files with 29 additions and 12 deletions
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26
src/image_loader_webp.cpp
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@@ -92,6 +92,13 @@ std::vector<uint8_t> ImageEncoderWebP::encodeToMemoryRGBA(const ImageResult& inp
if (extra_options.count("quality")) {
quality = extra_options.at("quality");
}
bool lossless = false;
int compression_level = 6;
if (extra_options.count("compression_level")) {
// if compression_level is set, we assume lossless
lossless = true;
compression_level = extra_options.at("compression_level");
}
// start encoding
@@ -113,15 +120,20 @@ std::vector<uint8_t> ImageEncoderWebP::encodeToMemoryRGBA(const ImageResult& inp
return {};
}
int prev_timestamp = 0;
for (const auto& frame : input_image.frames) {
WebPConfig config;
if (!WebPConfigPreset(&config, WebPPreset::WEBP_PRESET_DEFAULT, quality)) {
std::cerr << "IEWebP error: WebPConfigPreset()\n";
WebPConfig config;
if (!WebPConfigPreset(&config, WebPPreset::WEBP_PRESET_DEFAULT, quality)) {
std::cerr << "IEWebP error: WebPConfigPreset()\n";
return {};
}
if (lossless) {
if (!WebPConfigLosslessPreset(&config, compression_level)) {
std::cerr << "IEWebP error: WebPConfigLosslessPreset()\n";
return {};
}
//WebPConfigLosslessPreset(&config, 6); // 9 for max compression
}
int prev_timestamp = 0;
for (const auto& frame : input_image.frames) {
WebPPicture frame_webp;
if (!WebPPictureInit(&frame_webp)) {
std::cerr << "IEWebP error: WebPPictureInit()\n";
@@ -135,7 +147,7 @@ std::vector<uint8_t> ImageEncoderWebP::encodeToMemoryRGBA(const ImageResult& inp
}
if (!WebPAnimEncoderAdd(enc.get(), &frame_webp, prev_timestamp, &config)) {
std::cerr << "IEWebP error: WebPAnimEncoderAdd()\n";
std::cerr << "IEWebP error: WebPAnimEncoderAdd(): " << frame_webp.error_code << "\n";
WebPPictureFree(&frame_webp);
return {};
}