787 lines
26 KiB
C++
787 lines
26 KiB
C++
#pragma once
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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/util/char_array_buffer.hpp>
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extern "C" {
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#include <tiffio.h>
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}
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.hpp>
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#include <boost/interprocess/mapped_region.hpp>
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#include <boost/interprocess/streams/bufferstream.hpp>
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MAPNIK_DISABLE_WARNING_POP
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#include <mapnik/mapped_memory_cache.hpp>
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#endif
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#include "tiff_reader.hpp"
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// stl
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#include <memory>
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#include <fstream>
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#include <algorithm>
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namespace mapnik {
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namespace detail {
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MAPNIK_DECL toff_t tiff_seek_proc(thandle_t handle, toff_t off, int whence);
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MAPNIK_DECL int tiff_close_proc(thandle_t);
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MAPNIK_DECL toff_t tiff_size_proc(thandle_t handle);
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MAPNIK_DECL tsize_t tiff_read_proc(thandle_t handle, tdata_t buf, tsize_t size);
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MAPNIK_DECL tsize_t tiff_write_proc(thandle_t, tdata_t, tsize_t);
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MAPNIK_DECL void tiff_unmap_proc(thandle_t, tdata_t, toff_t);
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MAPNIK_DECL int tiff_map_proc(thandle_t, tdata_t*, toff_t*);
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template<typename T>
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struct tiff_io_traits
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{
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using input_stream_type = std::istream;
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};
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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template<>
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struct tiff_io_traits<boost::interprocess::ibufferstream>
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{
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using input_stream_type = boost::interprocess::ibufferstream;
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};
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#endif
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} // namespace detail
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template<typename T>
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class tiff_reader : public image_reader
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{
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using tiff_ptr = std::shared_ptr<TIFF>;
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using source_type = T;
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using input_stream = typename detail::tiff_io_traits<source_type>::input_stream_type;
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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mapnik::mapped_region_ptr mapped_region_;
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#endif
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struct tiff_closer
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{
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void operator()(TIFF* tif)
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{
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if (tif != 0)
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TIFFClose(tif);
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}
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};
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private:
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source_type source_;
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input_stream stream_;
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tiff_ptr tif_;
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int read_method_;
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int rows_per_strip_;
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int tile_width_;
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int tile_height_;
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std::size_t width_;
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std::size_t height_;
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boost::optional<box2d<double>> bbox_;
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unsigned bps_;
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unsigned sample_format_;
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unsigned photometric_;
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unsigned bands_;
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unsigned planar_config_;
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unsigned compression_;
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bool has_alpha_;
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bool is_tiled_;
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public:
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enum TiffType { generic = 1, stripped, tiled };
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explicit tiff_reader(std::string const& filename);
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tiff_reader(char const* data, std::size_t size);
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virtual ~tiff_reader();
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unsigned width() const final;
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unsigned height() const final;
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boost::optional<box2d<double>> bounding_box() const final;
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inline bool has_alpha() const final
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{
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return has_alpha_;
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}
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void read(unsigned x, unsigned y, image_rgba8& image) final;
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image_any read(unsigned x, unsigned y, unsigned width, unsigned height) final;
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// methods specific to tiff reader
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unsigned bits_per_sample() const
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{
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return bps_;
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}
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unsigned sample_format() const
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{
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return sample_format_;
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}
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unsigned photometric() const
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{
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return photometric_;
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}
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bool is_tiled() const
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{
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return is_tiled_;
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}
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unsigned tile_width() const
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{
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return tile_width_;
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}
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unsigned tile_height() const
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{
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return tile_height_;
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}
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unsigned rows_per_strip() const
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{
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return rows_per_strip_;
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}
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unsigned planar_config() const
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{
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return planar_config_;
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}
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unsigned compression() const
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{
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return compression_;
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}
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private:
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tiff_reader(const tiff_reader&);
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tiff_reader& operator=(const tiff_reader&);
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void init();
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template<typename ImageData>
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void read_generic(std::size_t x, std::size_t y, ImageData& image);
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template<typename ImageData>
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void read_stripped(std::size_t x, std::size_t y, ImageData& image);
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template<typename ImageData>
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void read_tiled(std::size_t x, std::size_t y, ImageData& image);
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template<typename ImageData>
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image_any read_any_gray(std::size_t x, std::size_t y, std::size_t width, std::size_t height);
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TIFF* open(std::istream& input);
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};
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template<typename T>
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tiff_reader<T>::tiff_reader(std::string const& filename)
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:
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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stream_()
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,
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#else
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source_()
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, stream_(&source_)
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,
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#endif
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tif_(nullptr)
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, read_method_(generic)
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, rows_per_strip_(0)
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, tile_width_(0)
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, tile_height_(0)
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, width_(0)
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, height_(0)
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, bps_(0)
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, sample_format_(SAMPLEFORMAT_UINT)
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, photometric_(0)
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, bands_(1)
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, planar_config_(PLANARCONFIG_CONTIG)
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, compression_(COMPRESSION_NONE)
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, has_alpha_(false)
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, is_tiled_(false)
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{
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#if defined(MAPNIK_MEMORY_MAPPED_FILE)
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boost::optional<mapnik::mapped_region_ptr> memory = mapnik::mapped_memory_cache::instance().find(filename, true);
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if (memory)
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{
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mapped_region_ = *memory;
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stream_.buffer(static_cast<char*>(mapped_region_->get_address()), mapped_region_->get_size());
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}
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else
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{
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throw image_reader_exception("could not create file mapping for " + filename);
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}
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#else
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source_.open(filename, std::ios_base::in | std::ios_base::binary);
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#endif
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if (!stream_)
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throw image_reader_exception("TIFF reader: cannot open file " + filename);
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init();
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}
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template<typename T>
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tiff_reader<T>::tiff_reader(char const* data, std::size_t size)
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: source_(data, size)
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, stream_(&source_)
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, tif_(nullptr)
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, read_method_(generic)
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, rows_per_strip_(0)
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, tile_width_(0)
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, tile_height_(0)
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, width_(0)
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, height_(0)
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, bps_(0)
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, sample_format_(SAMPLEFORMAT_UINT)
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, photometric_(0)
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, bands_(1)
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, planar_config_(PLANARCONFIG_CONTIG)
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, compression_(COMPRESSION_NONE)
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, has_alpha_(false)
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, is_tiled_(false)
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{
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if (!stream_)
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throw image_reader_exception("TIFF reader: cannot open image stream ");
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init();
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}
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template<typename T>
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void tiff_reader<T>::init()
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{
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// avoid calling TIFFs global structures
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TIFFSetWarningHandler(0);
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TIFFSetErrorHandler(0);
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TIFF* tif = open(stream_);
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if (!tif)
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throw image_reader_exception("Can't open tiff file");
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TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bps_);
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TIFFGetField(tif, TIFFTAG_SAMPLEFORMAT, &sample_format_);
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TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &photometric_);
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TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &bands_);
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MAPNIK_LOG_DEBUG(tiff_reader) << "bits per sample: " << bps_;
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MAPNIK_LOG_DEBUG(tiff_reader) << "sample format: " << sample_format_;
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MAPNIK_LOG_DEBUG(tiff_reader) << "photometric: " << photometric_;
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MAPNIK_LOG_DEBUG(tiff_reader) << "bands: " << bands_;
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TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width_);
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TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height_);
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TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &planar_config_);
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TIFFGetField(tif, TIFFTAG_COMPRESSION, &compression_);
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std::uint16_t orientation;
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if (TIFFGetField(tif, TIFFTAG_ORIENTATION, &orientation) == 0)
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{
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orientation = 1;
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}
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MAPNIK_LOG_DEBUG(tiff_reader) << "orientation: " << orientation;
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MAPNIK_LOG_DEBUG(tiff_reader) << "planar-config: " << planar_config_;
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is_tiled_ = TIFFIsTiled(tif);
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if (is_tiled_)
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{
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TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tile_width_);
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TIFFGetField(tif, TIFFTAG_TILELENGTH, &tile_height_);
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MAPNIK_LOG_DEBUG(tiff_reader) << "tiff is tiled";
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read_method_ = tiled;
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}
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else if (TIFFGetField(tif, TIFFTAG_ROWSPERSTRIP, &rows_per_strip_) != 0)
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{
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MAPNIK_LOG_DEBUG(tiff_reader) << "tiff is stripped";
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read_method_ = stripped;
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}
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// TIFFTAG_EXTRASAMPLES
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std::uint16_t extrasamples = 0;
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std::uint16_t* sampleinfo = nullptr;
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if (TIFFGetField(tif, TIFFTAG_EXTRASAMPLES, &extrasamples, &sampleinfo))
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{
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has_alpha_ = true;
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if (extrasamples > 0 && sampleinfo[0] == EXTRASAMPLE_UNSPECIFIED)
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{
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throw image_reader_exception("Unspecified provided for extra samples to tiff reader.");
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}
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}
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// Try extracting bounding box from geoTIFF tags
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{
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std::uint16_t count = 0;
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double* pixelscale;
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double* tilepoint;
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if (TIFFGetField(tif, 33550, &count, &pixelscale) == 1 && count == 3 &&
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TIFFGetField(tif, 33922, &count, &tilepoint) == 1 && count == 6)
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{
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MAPNIK_LOG_DEBUG(tiff_reader)
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<< "PixelScale:" << pixelscale[0] << "," << pixelscale[1] << "," << pixelscale[2];
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MAPNIK_LOG_DEBUG(tiff_reader) << "TilePoint:" << tilepoint[0] << "," << tilepoint[1] << "," << tilepoint[2];
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MAPNIK_LOG_DEBUG(tiff_reader) << " " << tilepoint[3] << "," << tilepoint[4] << "," << tilepoint[5];
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// assuming upper-left
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double lox = tilepoint[3];
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double loy = tilepoint[4];
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double hix = lox + pixelscale[0] * width_;
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double hiy = loy - pixelscale[1] * height_;
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bbox_.reset(box2d<double>(lox, loy, hix, hiy));
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MAPNIK_LOG_DEBUG(tiff_reader) << "Bounding Box:" << *bbox_;
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}
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}
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if (!is_tiled_ && compression_ == COMPRESSION_NONE && planar_config_ == PLANARCONFIG_CONTIG)
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{
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if (height_ > 128 * 1024 * 1024)
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{
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std::size_t line_size = (bands_ * width_ * bps_ + 7) / 8;
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std::size_t default_strip_height = 8192 / line_size;
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if (default_strip_height == 0)
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default_strip_height = 1;
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std::size_t num_strips = height_ / default_strip_height;
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if (num_strips > 128 * 1024 * 1024)
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{
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throw image_reader_exception("Can't allocate tiff");
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}
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}
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}
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}
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template<typename T>
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tiff_reader<T>::~tiff_reader()
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{}
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template<typename T>
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unsigned tiff_reader<T>::width() const
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{
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return width_;
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}
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template<typename T>
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unsigned tiff_reader<T>::height() const
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{
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return height_;
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}
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template<typename T>
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boost::optional<box2d<double>> tiff_reader<T>::bounding_box() const
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{
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return bbox_;
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}
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template<typename T>
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void tiff_reader<T>::read(unsigned x, unsigned y, image_rgba8& image)
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{
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if (read_method_ == stripped)
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{
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read_stripped(static_cast<std::size_t>(x), static_cast<std::size_t>(y), image);
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}
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else if (read_method_ == tiled)
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{
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read_tiled(static_cast<std::size_t>(x), static_cast<std::size_t>(y), image);
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}
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else
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{
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read_generic(static_cast<std::size_t>(x), static_cast<std::size_t>(y), image);
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}
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}
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template<typename T>
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template<typename ImageData>
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image_any tiff_reader<T>::read_any_gray(std::size_t x0, std::size_t y0, std::size_t width, std::size_t height)
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{
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using image_type = ImageData;
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using pixel_type = typename image_type::pixel_type;
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if (read_method_ == tiled)
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{
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image_type data(width, height);
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read_tiled<image_type>(x0, y0, data);
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return image_any(std::move(data));
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}
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else if (read_method_ == stripped)
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{
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image_type data(width, height);
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read_stripped<image_type>(x0, y0, data);
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return image_any(std::move(data));
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}
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else
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{
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TIFF* tif = open(stream_);
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if (tif)
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{
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image_type data(width, height);
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std::size_t block_size = rows_per_strip_ > 0 ? rows_per_strip_ : tile_height_;
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std::size_t start_y = y0 - y0 % block_size;
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std::size_t end_y = std::min(y0 + height, height_);
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std::size_t start_x = x0;
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std::size_t end_x = std::min(x0 + width, width_);
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std::size_t element_size = sizeof(pixel_type);
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MAPNIK_LOG_DEBUG(tiff_reader) << "SCANLINE SIZE=" << TIFFScanlineSize(tif);
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std::size_t size_to_allocate = (TIFFScanlineSize(tif) + element_size - 1) / element_size;
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std::unique_ptr<pixel_type[]> const scanline(new pixel_type[size_to_allocate]);
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if (planar_config_ == PLANARCONFIG_CONTIG)
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{
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for (std::size_t y = start_y; y < end_y; ++y)
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{
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// we have to read all scanlines sequentially from start_y
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// to be able to use scanline interface with compressed blocks.
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if (-1 != TIFFReadScanline(tif, scanline.get(), y) && (y >= y0))
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{
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pixel_type* row = data.get_row(y - y0);
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if (bands_ == 1)
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{
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std::transform(scanline.get() + start_x,
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scanline.get() + end_x,
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row,
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[](pixel_type const& p) { return p; });
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}
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else if (size_to_allocate == bands_ * width_)
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{
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// bands_ > 1 => packed bands in grayscale image e.g an extra alpha channel.
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// Just pick first one for now.
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pixel_type* buf = scanline.get() + start_x * bands_;
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std::size_t x_index = 0;
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for (std::size_t j = 0; j < end_x * bands_; ++j)
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{
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if (x_index >= width)
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break;
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if (j % bands_ == 0)
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{
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row[x_index++] = buf[j];
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}
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}
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}
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}
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}
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}
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else if (planar_config_ == PLANARCONFIG_SEPARATE)
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{
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for (std::size_t s = 0; s < bands_; ++s)
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{
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for (std::size_t y = start_y; y < end_y; ++y)
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{
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if (-1 != TIFFReadScanline(tif, scanline.get(), y) && (y >= y0))
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{
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pixel_type* row = data.get_row(y - y0);
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std::transform(scanline.get() + start_x,
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scanline.get() + end_x,
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row,
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[](pixel_type const& p) { return p; });
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}
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}
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}
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}
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return image_any(std::move(data));
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}
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}
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return image_any();
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}
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template<typename T>
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image_any tiff_reader<T>::read(unsigned x, unsigned y, unsigned width, unsigned height)
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{
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if (width > 10000 || height > 10000)
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{
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throw image_reader_exception("Can't allocate tiff > 10000x10000");
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}
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std::size_t x0 = static_cast<std::size_t>(x);
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std::size_t y0 = static_cast<std::size_t>(y);
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switch (photometric_)
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{
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case PHOTOMETRIC_MINISBLACK:
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case PHOTOMETRIC_MINISWHITE: {
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switch (bps_)
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{
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case 8: {
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switch (sample_format_)
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{
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case SAMPLEFORMAT_UINT: {
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return read_any_gray<image_gray8>(x0, y0, width, height);
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}
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case SAMPLEFORMAT_INT: {
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return read_any_gray<image_gray8s>(x0, y0, width, height);
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}
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default: {
|
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throw image_reader_exception(
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"tiff_reader: This sample format is not supported for this bits per sample");
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}
|
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}
|
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}
|
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case 16: {
|
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switch (sample_format_)
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{
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case SAMPLEFORMAT_UINT: {
|
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return read_any_gray<image_gray16>(x0, y0, width, height);
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}
|
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case SAMPLEFORMAT_INT: {
|
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return read_any_gray<image_gray16s>(x0, y0, width, height);
|
|
}
|
|
default: {
|
|
throw image_reader_exception(
|
|
"tiff_reader: This sample format is not supported for this bits per sample");
|
|
}
|
|
}
|
|
}
|
|
case 32: {
|
|
switch (sample_format_)
|
|
{
|
|
case SAMPLEFORMAT_UINT: {
|
|
return read_any_gray<image_gray32>(x0, y0, width, height);
|
|
}
|
|
case SAMPLEFORMAT_INT: {
|
|
return read_any_gray<image_gray32s>(x0, y0, width, height);
|
|
}
|
|
case SAMPLEFORMAT_IEEEFP: {
|
|
return read_any_gray<image_gray32f>(x0, y0, width, height);
|
|
}
|
|
default: {
|
|
throw image_reader_exception(
|
|
"tiff_reader: This sample format is not supported for this bits per sample");
|
|
}
|
|
}
|
|
}
|
|
case 64: {
|
|
switch (sample_format_)
|
|
{
|
|
case SAMPLEFORMAT_UINT: {
|
|
return read_any_gray<image_gray64>(x0, y0, width, height);
|
|
}
|
|
case SAMPLEFORMAT_INT: {
|
|
return read_any_gray<image_gray64s>(x0, y0, width, height);
|
|
}
|
|
case SAMPLEFORMAT_IEEEFP: {
|
|
return read_any_gray<image_gray64f>(x0, y0, width, height);
|
|
}
|
|
default: {
|
|
throw image_reader_exception(
|
|
"tiff_reader: This sample format is not supported for this bits per sample");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
default: {
|
|
// PHOTOMETRIC_PALETTE = 3;
|
|
// PHOTOMETRIC_MASK = 4;
|
|
// PHOTOMETRIC_SEPARATED = 5;
|
|
// PHOTOMETRIC_YCBCR = 6;
|
|
// PHOTOMETRIC_CIELAB = 8;
|
|
// PHOTOMETRIC_ICCLAB = 9;
|
|
// PHOTOMETRIC_ITULAB = 10;
|
|
// PHOTOMETRIC_LOGL = 32844;
|
|
// PHOTOMETRIC_LOGLUV = 32845;
|
|
image_rgba8 data(width, height, true, true);
|
|
read(x0, y0, data);
|
|
return image_any(std::move(data));
|
|
}
|
|
}
|
|
return image_any();
|
|
}
|
|
|
|
namespace detail {
|
|
|
|
struct rgb8
|
|
{
|
|
std::uint8_t r;
|
|
std::uint8_t g;
|
|
std::uint8_t b;
|
|
};
|
|
|
|
struct rgb8_to_rgba8
|
|
{
|
|
std::uint32_t operator()(rgb8 const& in) const { return ((255 << 24) | (in.r) | (in.g << 8) | (in.b << 16)); }
|
|
};
|
|
|
|
template<typename T>
|
|
struct tiff_reader_traits
|
|
{
|
|
using image_type = T;
|
|
using pixel_type = typename image_type::pixel_type;
|
|
|
|
constexpr static bool reverse = false;
|
|
static bool read_tile(TIFF* tif,
|
|
std::size_t x,
|
|
std::size_t y,
|
|
pixel_type* buf,
|
|
std::size_t tile_width,
|
|
std::size_t tile_height)
|
|
{
|
|
std::uint32_t tile_size = TIFFTileSize(tif);
|
|
return (TIFFReadEncodedTile(tif, TIFFComputeTile(tif, x, y, 0, 0), buf, tile_size) != -1);
|
|
}
|
|
|
|
static bool
|
|
read_strip(TIFF* tif, std::size_t y, std::size_t rows_per_strip, std::size_t strip_width, pixel_type* buf)
|
|
{
|
|
return (TIFFReadEncodedStrip(tif, y / rows_per_strip, buf, -1) != -1);
|
|
}
|
|
};
|
|
|
|
// default specialization that expands into RGBA
|
|
template<>
|
|
struct tiff_reader_traits<image_rgba8>
|
|
{
|
|
using image_type = image_rgba8;
|
|
using pixel_type = std::uint32_t;
|
|
constexpr static bool reverse = true;
|
|
static bool read_tile(TIFF* tif,
|
|
std::size_t x0,
|
|
std::size_t y0,
|
|
pixel_type* buf,
|
|
std::size_t tile_width,
|
|
std::size_t tile_height)
|
|
{
|
|
return (TIFFReadRGBATile(tif, x0, y0, buf) != 0);
|
|
}
|
|
|
|
static bool
|
|
read_strip(TIFF* tif, std::size_t y, std::size_t rows_per_strip, std::size_t strip_width, pixel_type* buf)
|
|
{
|
|
return (TIFFReadRGBAStrip(tif, y, buf) != 0);
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
template<typename T>
|
|
template<typename ImageData>
|
|
void tiff_reader<T>::read_generic(std::size_t, std::size_t, ImageData&)
|
|
{
|
|
throw image_reader_exception("tiff_reader: TODO - tiff is not stripped or tiled");
|
|
}
|
|
|
|
template<typename T>
|
|
template<typename ImageData>
|
|
void tiff_reader<T>::read_tiled(std::size_t x0, std::size_t y0, ImageData& image)
|
|
{
|
|
using pixel_type = typename detail::tiff_reader_traits<ImageData>::pixel_type;
|
|
|
|
TIFF* tif = open(stream_);
|
|
if (tif)
|
|
{
|
|
std::uint32_t tile_size = TIFFTileSize(tif);
|
|
std::unique_ptr<pixel_type[]> tile(new pixel_type[tile_size]);
|
|
std::size_t width = image.width();
|
|
std::size_t height = image.height();
|
|
std::size_t start_y = (y0 / tile_height_) * tile_height_;
|
|
std::size_t end_y = ((y0 + height) / tile_height_ + 1) * tile_height_;
|
|
std::size_t start_x = (x0 / tile_width_) * tile_width_;
|
|
std::size_t end_x = ((x0 + width) / tile_width_ + 1) * tile_width_;
|
|
end_y = std::min(end_y, height_);
|
|
end_x = std::min(end_x, width_);
|
|
bool pick_first_band =
|
|
(bands_ > 1) && (tile_size / (tile_width_ * tile_height_ * sizeof(pixel_type)) == bands_);
|
|
for (std::size_t y = start_y; y < end_y; y += tile_height_)
|
|
{
|
|
std::size_t ty0 = std::max(y0, y) - y;
|
|
std::size_t ty1 = std::min(height + y0, y + tile_height_) - y;
|
|
|
|
for (std::size_t x = start_x; x < end_x; x += tile_width_)
|
|
{
|
|
if (!detail::tiff_reader_traits<ImageData>::read_tile(tif, x, y, tile.get(), tile_width_, tile_height_))
|
|
{
|
|
MAPNIK_LOG_DEBUG(tiff_reader)
|
|
<< "read_tile(...) failed at " << x << "/" << y << " for " << width_ << "/" << height_ << "\n";
|
|
break;
|
|
}
|
|
if (pick_first_band)
|
|
{
|
|
std::uint32_t size = tile_width_ * tile_height_ * sizeof(pixel_type);
|
|
for (std::uint32_t n = 0; n < size; ++n)
|
|
{
|
|
tile[n] = tile[n * bands_];
|
|
}
|
|
}
|
|
std::size_t tx0 = std::max(x0, x);
|
|
std::size_t tx1 = std::min(width + x0, x + tile_width_);
|
|
std::size_t row_index = y + ty0 - y0;
|
|
|
|
if (detail::tiff_reader_traits<ImageData>::reverse)
|
|
{
|
|
for (std::size_t ty = ty0; ty < ty1; ++ty, ++row_index)
|
|
{
|
|
// This is in reverse because the TIFFReadRGBATile reads are inverted
|
|
image.set_row(row_index,
|
|
tx0 - x0,
|
|
tx1 - x0,
|
|
&tile[(tile_height_ - ty - 1) * tile_width_ + tx0 - x]);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (std::size_t ty = ty0; ty < ty1; ++ty, ++row_index)
|
|
{
|
|
image.set_row(row_index, tx0 - x0, tx1 - x0, &tile[ty * tile_width_ + tx0 - x]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
template<typename ImageData>
|
|
void tiff_reader<T>::read_stripped(std::size_t x0, std::size_t y0, ImageData& image)
|
|
{
|
|
using pixel_type = typename detail::tiff_reader_traits<ImageData>::pixel_type;
|
|
TIFF* tif = open(stream_);
|
|
if (tif)
|
|
{
|
|
std::uint32_t strip_size = TIFFStripSize(tif);
|
|
std::unique_ptr<pixel_type[]> strip(new pixel_type[strip_size]);
|
|
std::size_t width = image.width();
|
|
std::size_t height = image.height();
|
|
|
|
std::size_t start_y = (y0 / rows_per_strip_) * rows_per_strip_;
|
|
std::size_t end_y = std::min(y0 + height, height_);
|
|
std::size_t tx0, tx1, ty0, ty1;
|
|
tx0 = x0;
|
|
tx1 = std::min(width + x0, width_);
|
|
std::size_t row = 0;
|
|
bool pick_first_band = (bands_ > 1) && (strip_size / (width_ * rows_per_strip_ * sizeof(pixel_type)) == bands_);
|
|
for (std::size_t y = start_y; y < end_y; y += rows_per_strip_)
|
|
{
|
|
ty0 = std::max(y0, y) - y;
|
|
ty1 = std::min(end_y, y + rows_per_strip_) - y;
|
|
|
|
if (!detail::tiff_reader_traits<ImageData>::read_strip(tif, y, rows_per_strip_, width_, strip.get()))
|
|
{
|
|
MAPNIK_LOG_DEBUG(tiff_reader)
|
|
<< "TIFFRead(Encoded|RGBA)Strip failed at " << y << " for " << width_ << "/" << height_ << "\n";
|
|
break;
|
|
}
|
|
if (pick_first_band)
|
|
{
|
|
std::uint32_t size = width_ * rows_per_strip_ * sizeof(pixel_type);
|
|
for (std::uint32_t n = 0; n < size; ++n)
|
|
{
|
|
strip[n] = strip[bands_ * n];
|
|
}
|
|
}
|
|
|
|
if (detail::tiff_reader_traits<ImageData>::reverse)
|
|
{
|
|
std::size_t num_rows = std::min(height_ - y, static_cast<std::size_t>(rows_per_strip_));
|
|
for (std::size_t ty = ty0; ty < ty1; ++ty)
|
|
{
|
|
// This is in reverse because the TIFFReadRGBAStrip reads are inverted
|
|
image.set_row(row++, tx0 - x0, tx1 - x0, &strip[(num_rows - ty - 1) * width_ + tx0]);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (std::size_t ty = ty0; ty < ty1; ++ty)
|
|
{
|
|
image.set_row(row++, tx0 - x0, tx1 - x0, &strip[ty * width_ + tx0]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template<typename T>
|
|
TIFF* tiff_reader<T>::open(std::istream& input)
|
|
{
|
|
if (!tif_)
|
|
{
|
|
tif_ = tiff_ptr(TIFFClientOpen("tiff_input_stream",
|
|
"rcm",
|
|
reinterpret_cast<thandle_t>(&input),
|
|
detail::tiff_read_proc,
|
|
detail::tiff_write_proc,
|
|
detail::tiff_seek_proc,
|
|
detail::tiff_close_proc,
|
|
detail::tiff_size_proc,
|
|
detail::tiff_map_proc,
|
|
detail::tiff_unmap_proc),
|
|
tiff_closer());
|
|
}
|
|
return tif_.get();
|
|
}
|
|
|
|
} // namespace mapnik
|