diff options
Diffstat (limited to 'src/lib/image_jpeg.cc')
| -rw-r--r-- | src/lib/image_jpeg.cc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/lib/image_jpeg.cc b/src/lib/image_jpeg.cc index 28bbb7574..b92be0d9d 100644 --- a/src/lib/image_jpeg.cc +++ b/src/lib/image_jpeg.cc @@ -22,6 +22,7 @@ #include "dcpomatic_assert.h" #include "exceptions.h" #include "image.h" +#include <dcp/array_data.h> #include <jpeglib.h> #include "i18n.h" @@ -133,3 +134,39 @@ image_as_jpeg (shared_ptr<const Image> image, int quality) } +shared_ptr<Image> +image_from_jpeg(boost::filesystem::path file) +{ + struct jpeg_decompress_struct decompress; + struct jpeg_error_mgr error; + + decompress.err = jpeg_std_error(&error); + error.error_exit = error_exit; + jpeg_create_decompress(&decompress); + + auto data = dcp::ArrayData(file); + jpeg_mem_src(&decompress, data.data(), data.size()); + + jpeg_read_header(&decompress, TRUE); + + jpeg_start_decompress(&decompress); + + DCPOMATIC_ASSERT(decompress.output_components == 3); + + auto output = std::make_shared<Image>( + AV_PIX_FMT_RGB24, + dcp::Size{static_cast<int>(decompress.output_width), static_cast<int>(decompress.output_height)}, + Image::Alignment::COMPACT + ); + + while (decompress.output_scanline < decompress.output_height) { + uint8_t* pointers[1] = { output->data()[0] + output->stride()[0] * decompress.output_scanline }; + jpeg_read_scanlines(&decompress, pointers, 1); + } + + jpeg_finish_decompress(&decompress); + jpeg_destroy_decompress(&decompress); + + return output; +} + |