+ backport image_reader from buffer/string from image-readers-c++11 branch
This commit is contained in:
artemp
parent
4c38bf9b81
commit
3f6abd3362
6 changed files with 311 additions and 89 deletions
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@ -164,6 +164,36 @@ boost::shared_ptr<image_32> open_from_file(std::string const& filename)
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throw mapnik::image_reader_exception("Unsupported image format:" + filename);
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}
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boost::shared_ptr<image_32> fromstring(std::string const& str)
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{
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std::auto_ptr<image_reader> reader(get_image_reader(str.c_str(),str.size()));
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if (reader.get())
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{
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boost::shared_ptr<image_32> image_ptr = boost::make_shared<image_32>(reader->width(),reader->height());
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reader->read(0,0,image_ptr->data());
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return image_ptr;
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}
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throw mapnik::image_reader_exception("Failed to load image from buffer" );
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}
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boost::shared_ptr<image_32> frombuffer(PyObject * obj)
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{
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void const* buffer=0;
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Py_ssize_t buffer_len;
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if (PyObject_AsReadBuffer(obj, &buffer, &buffer_len) == 0)
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{
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std::auto_ptr<image_reader> reader(get_image_reader(reinterpret_cast<char const*>(buffer),buffer_len));
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if (reader.get())
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{
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boost::shared_ptr<image_32> image_ptr = boost::make_shared<image_32>(reader->width(),reader->height());
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reader->read(0,0,image_ptr->data());
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return image_ptr;
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}
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}
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throw mapnik::image_reader_exception("Failed to load image from buffer" );
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}
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void blend (image_32 & im, unsigned x, unsigned y, image_32 const& im2, float opacity)
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{
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im.set_rectangle_alpha2(im2.data(),x,y,opacity);
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@ -257,6 +287,10 @@ void export_image()
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.def("save", &save_to_file3)
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.def("open",open_from_file)
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.staticmethod("open")
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.def("frombuffer",&frombuffer)
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.staticmethod("frombuffer")
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.def("fromstring",&fromstring)
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.staticmethod("fromstring")
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#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
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.def("from_cairo",&from_cairo)
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.staticmethod("from_cairo")
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@ -83,7 +83,17 @@ public:
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{
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return (pos->second)(file);
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}
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return factory_error_policy<key_type,product_type>::on_unknown_type(key);
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return 0;
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}
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product_type* create_object(const key_type& key, char const* data, std::size_t size)
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{
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typename product_map::const_iterator pos=map_.find(key);
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if (pos!=map_.end())
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{
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return (pos->second)(data, size);
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}
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return 0;
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}
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};
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}
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@ -27,13 +27,16 @@
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#include <mapnik/image_data.hpp>
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#include <mapnik/config.hpp>
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#include <mapnik/noncopyable.hpp>
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#include <mapnik/factory.hpp>
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// boost
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#include <boost/optional.hpp>
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// stl
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#include <stdexcept>
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#include <string>
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namespace mapnik
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{
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class image_reader_exception : public std::exception
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{
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private:
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@ -60,8 +63,11 @@ struct MAPNIK_DECL image_reader : private mapnik::noncopyable
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};
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bool register_image_reader(std::string const& type,image_reader* (*)(std::string const&));
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bool register_image_reader(std::string const& type,image_reader* (*)(char const*, std::size_t));
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MAPNIK_DECL image_reader* get_image_reader(std::string const& file,std::string const& type);
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MAPNIK_DECL image_reader* get_image_reader(std::string const& file);
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MAPNIK_DECL image_reader* get_image_reader(char const* data, size_t size);
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}
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@ -27,15 +27,59 @@
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namespace mapnik
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{
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typedef factory<image_reader,std::string,
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image_reader* (*)(std::string const&)> ImageReaderFactory;
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typedef factory<image_reader,std::string,
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image_reader* (*)(char const*, std::size_t)> MemImageReaderFactory;
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inline boost::optional<std::string> type_from_bytes(char const* data, size_t size)
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{
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typedef boost::optional<std::string> result_type;
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if (size >= 4)
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{
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unsigned int magic = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
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if (magic == 0x89504E47U)
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{
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return result_type("png");
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}
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else if (magic == 0x49492A00 || magic == 0x4D4D002A)
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{
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return result_type("tiff");
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}
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}
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if (size>=2)
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{
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unsigned int magic = ((data[0] << 8) | data[1]) & 0xffff;
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if (magic == 0xffd8)
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{
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return result_type("jpeg");
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}
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}
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return result_type();
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}
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bool register_image_reader(std::string const& type,image_reader* (* fun)(std::string const&))
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{
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return ImageReaderFactory::instance().register_product(type,fun);
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}
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bool register_image_reader(std::string const& type,image_reader* (* fun)(char const*, std::size_t))
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{
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return MemImageReaderFactory::instance().register_product(type,fun);
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}
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image_reader* get_image_reader(char const* data, size_t size)
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{
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boost::optional<std::string> type = type_from_bytes(data,size);
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if (type)
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return MemImageReaderFactory::instance().create_object(*type, data,size);
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return 0;
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}
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image_reader* get_image_reader(std::string const& filename,std::string const& type)
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{
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return ImageReaderFactory::instance().create_object(type,filename);
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@ -23,7 +23,6 @@
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// mapnik
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#include <mapnik/image_reader.hpp>
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#include <mapnik/color.hpp>
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#include <mapnik/noncopyable.hpp>
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// jpeg
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extern "C"
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@ -34,24 +33,29 @@ extern "C"
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// boost
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#include <boost/shared_ptr.hpp>
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#include <boost/scoped_array.hpp>
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#include <boost/iostreams/device/file.hpp>
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#include <boost/iostreams/device/array.hpp>
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#include <boost/iostreams/stream.hpp>
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// std
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#include <cstdio>
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namespace mapnik
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{
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template <typename T>
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class jpeg_reader : public image_reader
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{
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struct jpeg_file_guard
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public:
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typedef T source_type;
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typedef boost::iostreams::stream<source_type> input_stream;
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const static unsigned BUF_SIZE = 4096;
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private:
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struct jpeg_stream_wrapper
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{
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jpeg_file_guard(FILE * fd)
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: fd_(fd) {}
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~jpeg_file_guard()
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{
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if (fd_) fclose(fd_);
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}
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FILE * fd_;
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jpeg_source_mgr manager;
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input_stream * stream;
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JOCTET buffer[BUF_SIZE];
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};
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struct jpeg_info_guard
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@ -67,11 +71,13 @@ class jpeg_reader : public image_reader
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};
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private:
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std::string file_name_;
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source_type source_;
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input_stream stream_;
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unsigned width_;
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unsigned height_;
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public:
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explicit jpeg_reader(std::string const& fileName);
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explicit jpeg_reader(std::string const& file_name);
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explicit jpeg_reader(char const* data, size_t size);
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~jpeg_reader();
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unsigned width() const;
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unsigned height() const;
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@ -81,44 +87,135 @@ private:
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void init();
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static void on_error(j_common_ptr cinfo);
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static void on_error_message(j_common_ptr cinfo);
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static void init_source(j_decompress_ptr cinfo);
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static boolean fill_input_buffer(j_decompress_ptr cinfo);
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static void skip(j_decompress_ptr cinfo, long count);
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static void term(j_decompress_ptr cinfo);
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static void attach_stream(j_decompress_ptr cinfo, input_stream* in);
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};
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namespace
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{
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image_reader* create_jpeg_reader(std::string const& file)
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{
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return new jpeg_reader(file);
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}
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const bool registered = register_image_reader("jpeg",create_jpeg_reader);
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return new jpeg_reader<boost::iostreams::file_source>(file);
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}
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jpeg_reader::jpeg_reader(std::string const& fileName)
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: file_name_(fileName),
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image_reader* create_jpeg_reader2(char const* data, size_t size)
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{
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return new jpeg_reader<boost::iostreams::array_source>(data, size);
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}
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const bool registered = register_image_reader("jpeg",create_jpeg_reader);
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const bool registered2 = register_image_reader("jpeg",create_jpeg_reader2);
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}
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// ctors
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template <typename T>
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jpeg_reader<T>::jpeg_reader(std::string const& file_name)
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: source_(file_name,std::ios_base::in | std::ios_base::binary),
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stream_(source_),
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width_(0),
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height_(0)
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{
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if (!stream_) throw image_reader_exception("cannot open image file "+ file_name);
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init();
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}
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jpeg_reader::~jpeg_reader() {}
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void jpeg_reader::on_error(j_common_ptr cinfo)
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template <typename T>
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jpeg_reader<T>::jpeg_reader(char const* data, size_t size)
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: source_(data, size),
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stream_(source_),
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width_(0),
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height_(0)
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{
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if (!stream_) throw image_reader_exception("cannot open image stream");
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init();
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}
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// dtor
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template <typename T>
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jpeg_reader<T>::~jpeg_reader() {}
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// jpeg stream wrapper
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template <typename T>
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void jpeg_reader<T>::init_source (j_decompress_ptr cinfo)
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{
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jpeg_stream_wrapper* wrap = reinterpret_cast<jpeg_stream_wrapper*>(cinfo->src);
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wrap->stream->seekg(0,std::ios_base::beg);
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}
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template <typename T>
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boolean jpeg_reader<T>::fill_input_buffer (j_decompress_ptr cinfo)
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{
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jpeg_stream_wrapper* wrap = reinterpret_cast<jpeg_stream_wrapper*>(cinfo->src);
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wrap->stream->read(reinterpret_cast<char*>(&wrap->buffer[0]),BUF_SIZE);
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std::streamsize size = wrap->stream->gcount();
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wrap->manager.next_input_byte = wrap->buffer;
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wrap->manager.bytes_in_buffer = BUF_SIZE;
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return (size > 0) ? TRUE : FALSE;
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}
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template <typename T>
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void jpeg_reader<T>::skip(j_decompress_ptr cinfo, long count)
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{
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if (count <= 0) return; //A zero or negative skip count should be treated as a no-op.
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jpeg_stream_wrapper* wrap = reinterpret_cast<jpeg_stream_wrapper*>(cinfo->src);
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if (wrap->manager.bytes_in_buffer > 0 && count < wrap->manager.bytes_in_buffer)
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{
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wrap->manager.bytes_in_buffer -= count;
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wrap->manager.next_input_byte = &wrap->buffer[BUF_SIZE - wrap->manager.bytes_in_buffer];
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}
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else
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{
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wrap->stream->seekg(count, std::ios_base::cur);
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// trigger buffer fill
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wrap->manager.next_input_byte = 0;
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wrap->manager.bytes_in_buffer = 0; //bytes_in_buffer may be zero on return.
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}
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}
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template <typename T>
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void jpeg_reader<T>::term (j_decompress_ptr cinfo)
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{
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// no-op
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}
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template <typename T>
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void jpeg_reader<T>::attach_stream (j_decompress_ptr cinfo, input_stream* in)
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{
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if (cinfo->src == 0)
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{
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cinfo->src = (struct jpeg_source_mgr *)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(jpeg_stream_wrapper));
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}
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jpeg_reader::jpeg_stream_wrapper * src = reinterpret_cast<jpeg_reader::jpeg_stream_wrapper*> (cinfo->src);
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src->manager.init_source = init_source;
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src->manager.fill_input_buffer = fill_input_buffer;
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src->manager.skip_input_data = skip;
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src->manager.resync_to_restart = jpeg_resync_to_restart;
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src->manager.term_source = term;
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src->manager.bytes_in_buffer = 0;
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src->manager.next_input_byte = 0;
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src->stream = in;
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}
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template <typename T>
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void jpeg_reader<T>::on_error(j_common_ptr cinfo)
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{
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//(*cinfo->err->output_message)(cinfo);
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//jpeg_destroy(cinfo);
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throw image_reader_exception("JPEG Reader: libjpeg could not read image");
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}
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void jpeg_reader::on_error_message(j_common_ptr cinfo)
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template <typename T>
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void jpeg_reader<T>::on_error_message(j_common_ptr cinfo)
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{
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// used to supress jpeg from printing to stderr
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}
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void jpeg_reader::init()
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template <typename T>
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void jpeg_reader<T>::init()
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{
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FILE * fp = fopen(file_name_.c_str(),"rb");
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if (!fp) throw image_reader_exception("JPEG Reader: cannot open image file " + file_name_);
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jpeg_file_guard guard(fp);
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jpeg_decompress_struct cinfo;
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jpeg_info_guard iguard(&cinfo);
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jpeg_error_mgr jerr;
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@ -126,38 +223,42 @@ void jpeg_reader::init()
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jerr.error_exit = on_error;
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jerr.output_message = on_error_message;
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, fp);
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attach_stream(&cinfo, &stream_);
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int ret = jpeg_read_header(&cinfo, TRUE);
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if (ret != JPEG_HEADER_OK) throw image_reader_exception("JPEG Reader: failed to read header in " + file_name_);
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if (ret != JPEG_HEADER_OK)
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throw image_reader_exception("JPEG Reader: failed to read header");
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jpeg_start_decompress(&cinfo);
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width_ = cinfo.output_width;
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height_ = cinfo.output_height;
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if (cinfo.out_color_space == JCS_UNKNOWN)
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{
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throw image_reader_exception("JPEG Reader: failed to read unknown color space in " + file_name_);
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throw image_reader_exception("JPEG Reader: failed to read unknown color space");
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}
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if (cinfo.output_width == 0 || cinfo.output_height == 0)
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{
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throw image_reader_exception("JPEG Reader: failed to read image size of " + file_name_);
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throw image_reader_exception("JPEG Reader: failed to read image size of");
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}
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}
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unsigned jpeg_reader::width() const
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template <typename T>
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unsigned jpeg_reader<T>::width() const
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{
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return width_;
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}
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unsigned jpeg_reader::height() const
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template <typename T>
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unsigned jpeg_reader<T>::height() const
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{
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return height_;
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}
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void jpeg_reader::read(unsigned x0, unsigned y0, image_data_32& image)
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template <typename T>
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void jpeg_reader<T>::read(unsigned x0, unsigned y0, image_data_32& image)
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{
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FILE * fp = fopen(file_name_.c_str(),"rb");
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if (!fp) throw image_reader_exception("JPEG Reader: cannot open image file " + file_name_);
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jpeg_file_guard guard(fp);
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stream_.clear();
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stream_.seekg(0, std::ios_base::beg);
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jpeg_decompress_struct cinfo;
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jpeg_info_guard iguard(&cinfo);
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jpeg_error_mgr jerr;
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@ -165,9 +266,9 @@ void jpeg_reader::read(unsigned x0, unsigned y0, image_data_32& image)
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jerr.error_exit = on_error;
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jerr.output_message = on_error_message;
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, fp);
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attach_stream(&cinfo, &stream_);
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int ret = jpeg_read_header(&cinfo, TRUE);
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if (ret != JPEG_HEADER_OK) throw image_reader_exception("JPEG Reader: failed to read header in " + file_name_);
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if (ret != JPEG_HEADER_OK) throw image_reader_exception("JPEG Reader read(): failed to read header");
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jpeg_start_decompress(&cinfo);
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JSAMPARRAY buffer;
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int row_stride;
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@ -20,32 +20,27 @@
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/image_reader.hpp>
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#include <mapnik/noncopyable.hpp>
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extern "C"
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{
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#include <png.h>
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}
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// boost
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#include <boost/scoped_array.hpp>
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#include <boost/iostreams/device/file.hpp>
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#include <boost/iostreams/stream.hpp>
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namespace mapnik
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||||
{
|
||||
|
||||
template <typename T>
|
||||
class png_reader : public image_reader
|
||||
{
|
||||
struct png_file_guard
|
||||
{
|
||||
png_file_guard(FILE * fd)
|
||||
: fd_(fd) {}
|
||||
|
||||
~png_file_guard()
|
||||
{
|
||||
if (fd_) fclose(fd_);
|
||||
}
|
||||
FILE * fd_;
|
||||
};
|
||||
typedef T source_type;
|
||||
typedef boost::iostreams::stream<source_type> ifstream;
|
||||
|
||||
struct png_struct_guard
|
||||
{
|
||||
|
|
@ -62,13 +57,16 @@ class png_reader : public image_reader
|
|||
};
|
||||
|
||||
private:
|
||||
std::string fileName_;
|
||||
|
||||
source_type source_;
|
||||
ifstream stream_;
|
||||
unsigned width_;
|
||||
unsigned height_;
|
||||
int bit_depth_;
|
||||
int color_type_;
|
||||
public:
|
||||
explicit png_reader(std::string const& fileName);
|
||||
explicit png_reader(std::string const& file_name);
|
||||
explicit png_reader(char const* data, std::size_t size);
|
||||
~png_reader();
|
||||
unsigned width() const;
|
||||
unsigned height() const;
|
||||
|
|
@ -76,28 +74,26 @@ public:
|
|||
void read(unsigned x,unsigned y,image_data_32& image);
|
||||
private:
|
||||
void init();
|
||||
static void png_read_data(png_structp png_ptr, png_bytep data, png_size_t length);
|
||||
};
|
||||
|
||||
namespace
|
||||
{
|
||||
|
||||
image_reader* create_png_reader(std::string const& file)
|
||||
{
|
||||
return new png_reader(file);
|
||||
}
|
||||
const bool registered = register_image_reader("png",create_png_reader);
|
||||
return new png_reader<boost::iostreams::file_source>(file);
|
||||
}
|
||||
|
||||
png_reader::png_reader(std::string const& fileName)
|
||||
: fileName_(fileName),
|
||||
width_(0),
|
||||
height_(0),
|
||||
bit_depth_(0),
|
||||
color_type_(0)
|
||||
image_reader* create_png_reader2(char const * data, std::size_t size)
|
||||
{
|
||||
init();
|
||||
return new png_reader<boost::iostreams::array_source>(data, size);
|
||||
}
|
||||
|
||||
const bool registered = register_image_reader("png",create_png_reader);
|
||||
const bool registered2 = register_image_reader("png", create_png_reader2);
|
||||
}
|
||||
|
||||
png_reader::~png_reader() {}
|
||||
|
||||
void user_error_fn(png_structp png_ptr, png_const_charp error_msg)
|
||||
{
|
||||
|
|
@ -109,35 +105,64 @@ void user_warning_fn(png_structp png_ptr, png_const_charp warning_msg)
|
|||
MAPNIK_LOG_DEBUG(png_reader) << "libpng warning: '" << warning_msg << "'";
|
||||
}
|
||||
|
||||
static void
|
||||
png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
|
||||
template <typename T>
|
||||
void png_reader<T>::png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
|
||||
{
|
||||
png_size_t check;
|
||||
check = (png_size_t)fread(data, (png_size_t)1, length,
|
||||
(FILE *)png_get_io_ptr(png_ptr));
|
||||
|
||||
if (check != length)
|
||||
ifstream * fin = reinterpret_cast<ifstream*>(png_get_io_ptr(png_ptr));
|
||||
fin->read(reinterpret_cast<char*>(data), length);
|
||||
if (fin->gcount() != length)
|
||||
{
|
||||
png_error(png_ptr, "Read Error");
|
||||
}
|
||||
}
|
||||
|
||||
void png_reader::init()
|
||||
template <typename T>
|
||||
png_reader<T>::png_reader(std::string const& file_name)
|
||||
: source_(file_name,std::ios_base::in | std::ios_base::binary),
|
||||
stream_(source_),
|
||||
width_(0),
|
||||
height_(0),
|
||||
bit_depth_(0),
|
||||
color_type_(0)
|
||||
{
|
||||
FILE *fp=fopen(fileName_.c_str(),"rb");
|
||||
if (!fp) throw image_reader_exception("cannot open image file "+fileName_);
|
||||
png_file_guard guard(fp);
|
||||
|
||||
if (!stream_) throw image_reader_exception("cannot open image file "+ file_name);
|
||||
init();
|
||||
}
|
||||
|
||||
template <typename T>
|
||||
png_reader<T>::png_reader(char const* data, std::size_t size)
|
||||
: source_(data,size),
|
||||
stream_(source_),
|
||||
width_(0),
|
||||
height_(0),
|
||||
bit_depth_(0),
|
||||
color_type_(0)
|
||||
{
|
||||
|
||||
if (!stream_) throw image_reader_exception("cannot open image stream");
|
||||
init();
|
||||
}
|
||||
|
||||
|
||||
template <typename T>
|
||||
png_reader<T>::~png_reader() {}
|
||||
|
||||
|
||||
template <typename T>
|
||||
void png_reader<T>::init()
|
||||
{
|
||||
png_byte header[8];
|
||||
memset(header,0,8);
|
||||
if ( fread(header,1,8,fp) != 8)
|
||||
stream_.read(reinterpret_cast<char*>(header),8);
|
||||
if ( stream_.gcount() != 8)
|
||||
{
|
||||
throw image_reader_exception("Could not read " + fileName_);
|
||||
throw image_reader_exception("Could not read image");
|
||||
}
|
||||
int is_png=!png_sig_cmp(header,0,8);
|
||||
if (!is_png)
|
||||
{
|
||||
throw image_reader_exception(fileName_ + " is not a png file");
|
||||
throw image_reader_exception(" File or steam is not a png");
|
||||
}
|
||||
png_structp png_ptr = png_create_read_struct
|
||||
(PNG_LIBPNG_VER_STRING,0,0,0);
|
||||
|
|
@ -155,7 +180,7 @@ void png_reader::init()
|
|||
info_ptr = png_create_info_struct(png_ptr);
|
||||
if (!info_ptr) throw image_reader_exception("failed to create info_ptr");
|
||||
|
||||
png_set_read_fn(png_ptr, (png_voidp)fp, png_read_data);
|
||||
png_set_read_fn(png_ptr, (png_voidp)&stream_, png_read_data);
|
||||
|
||||
png_set_sig_bytes(png_ptr,8);
|
||||
png_read_info(png_ptr, info_ptr);
|
||||
|
|
@ -169,21 +194,23 @@ void png_reader::init()
|
|||
MAPNIK_LOG_DEBUG(png_reader) << "png_reader: bit_depth=" << bit_depth_ << ",color_type=" << color_type_;
|
||||
}
|
||||
|
||||
unsigned png_reader::width() const
|
||||
template <typename T>
|
||||
unsigned png_reader<T>::width() const
|
||||
{
|
||||
return width_;
|
||||
}
|
||||
|
||||
unsigned png_reader::height() const
|
||||
template <typename T>
|
||||
unsigned png_reader<T>::height() const
|
||||
{
|
||||
return height_;
|
||||
}
|
||||
|
||||
void png_reader::read(unsigned x0, unsigned y0,image_data_32& image)
|
||||
template <typename T>
|
||||
void png_reader<T>::read(unsigned x0, unsigned y0,image_data_32& image)
|
||||
{
|
||||
FILE *fp=fopen(fileName_.c_str(),"rb");
|
||||
if (!fp) throw image_reader_exception("cannot open image file "+fileName_);
|
||||
png_file_guard guard(fp);
|
||||
stream_.clear();
|
||||
stream_.seekg(0, std::ios_base::beg);
|
||||
|
||||
png_structp png_ptr = png_create_read_struct
|
||||
(PNG_LIBPNG_VER_STRING,0,0,0);
|
||||
|
|
@ -201,7 +228,7 @@ void png_reader::read(unsigned x0, unsigned y0,image_data_32& image)
|
|||
info_ptr = png_create_info_struct(png_ptr);
|
||||
if (!info_ptr) throw image_reader_exception("failed to create info_ptr");
|
||||
|
||||
png_set_read_fn(png_ptr, (png_voidp)fp, png_read_data);
|
||||
png_set_read_fn(png_ptr, (png_voidp)&stream_, png_read_data);
|
||||
png_read_info(png_ptr, info_ptr);
|
||||
|
||||
if (color_type_ == PNG_COLOR_TYPE_PALETTE)
|
||||
|
|
|
|||
Loading…
Reference in a new issue