std::unique_ptr<SkEncoder> SkJpegEncoder::Make(SkWStream* dst, const SkPixmap& src,
const Options& options) {
if (!SkPixmapIsValid(src, options.fBlendBehavior)) {
return nullptr;
}
std::unique_ptr<SkJpegEncoderMgr> encoderMgr = SkJpegEncoderMgr::Make(dst);
if (setjmp(encoderMgr->jmpBuf())) {
return nullptr;
}
if (!encoderMgr->setParams(src.info(), options)) {
return nullptr;
}
jpeg_set_quality(encoderMgr->cinfo(), options.fQuality, TRUE);
jpeg_start_compress(encoderMgr->cinfo(), TRUE);
sk_sp<SkData> icc = icc_from_color_space(src.info());
if (icc) {
// Create a contiguous block of memory with the icc signature followed by the profile.
sk_sp<SkData> markerData =
SkData::MakeUninitialized(kICCMarkerHeaderSize + icc->size());
uint8_t* ptr = (uint8_t*) markerData->writable_data();
memcpy(ptr, kICCSig, sizeof(kICCSig));
ptr += sizeof(kICCSig);
*ptr++ = 1; // This is the first marker.
*ptr++ = 1; // Out of one total markers.
memcpy(ptr, icc->data(), icc->size());
jpeg_write_marker(encoderMgr->cinfo(), kICCMarker, markerData->bytes(), markerData->size());
}
return std::unique_ptr<SkJpegEncoder>(new SkJpegEncoder(std::move(encoderMgr), src));
}
static void set_icc(png_structp png_ptr, png_infop info_ptr, const SkImageInfo& info) {
sk_sp<SkData> icc = icc_from_color_space(info);
if (!icc) {
return;
}
#if PNG_LIBPNG_VER_MAJOR > 1 || (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 5)
const char* name = "Skia";
png_const_bytep iccPtr = icc->bytes();
#else
SkString str("Skia");
char* name = str.writable_str();
png_charp iccPtr = (png_charp) icc->writable_data();
#endif
png_set_iCCP(png_ptr, info_ptr, name, 0, iccPtr, icc->size());
}
