void
embryo::savePNG(ostream& inStream, const Picture& inPicture) {
// Setup libpng
png_structp lPngPtr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
if (!lPngPtr)
throw Exception("Out of memory");
png_infop lInfoPtr = png_create_info_struct(lPngPtr);
if (!lInfoPtr) {
png_destroy_write_struct(&lPngPtr, 0);
throw Exception("Out of memory");
}
png_set_error_fn(lPngPtr, 0, &errorCallback, &warningCallback);
png_set_write_fn(lPngPtr, &inStream, &writeDataCallback, &flushCallback);
// Setup and write the picture infos
png_set_IHDR(lPngPtr, lInfoPtr,
inPicture.width(),
inPicture.height(),
8,
PNG_COLOR_TYPE_GRAY,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_write_info(lPngPtr, lInfoPtr);
// Write the picture datas
png_bytep lRasterRow = new png_byte[inPicture.width()];
const double* lSrc = inPicture.pixels();
for(size_t i = 0; i < inPicture.height(); ++i) {
png_bytep lDst = lRasterRow;
for(size_t j = inPicture.width(); j != 0; ++lSrc, ++lDst, --j)
(*lDst) = 255.0 * (*lSrc);
png_write_row(lPngPtr, lRasterRow);
}
png_write_end(lPngPtr, lInfoPtr);
// Job done
delete[] lRasterRow;
png_destroy_write_struct(&lPngPtr, &lInfoPtr);
}
