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LibGfx/TIFF: Add support for images with CCITT3 1D compression
This compression (tag Compression=2) is not very popular on its own, but a base to implement CCITT3 2D and CCITT4 compressions. As the format has no real benefits, it is quite hard to find an app that accepts tho encode that for you. So I used the following program that calls `libtiff` directly: ```cpp #include <vector> #include <cstdlib> #include <iostream> #include <tiffio.h> // An array containing 0 and 1 of length width * height. extern std::vector<uint8_t> array; int main() { // From: https://stackoverflow.com/a/34257789 TIFF *image = TIFFOpen("input.tif", "w"); int const width = 400; int const height = 300; TIFFSetField(image, TIFFTAG_IMAGEWIDTH, width); TIFFSetField(image, TIFFTAG_IMAGELENGTH, height); TIFFSetField(image, TIFFTAG_PHOTOMETRIC, 0); TIFFSetField(image, TIFFTAG_COMPRESSION, COMPRESSION_CCITTRLE); TIFFSetField(image, TIFFTAG_BITSPERSAMPLE, 1); TIFFSetField(image, TIFFTAG_SAMPLESPERPIXEL, 1); TIFFSetField(image, TIFFTAG_ROWSPERSTRIP, 1); std::vector<uint8_t> scan_line(width / 8 + 8, 0); int count = 0; for (int i = 0; i < height; i++) { std::fill(scan_line.begin(), scan_line.end(), 0); for (int x = 0; x < width; ++x) { uint8_t eight_pixels = scan_line.at(x / 8); eight_pixels = eight_pixels << 1; eight_pixels |= !array.at(i * width + x); scan_line.at(x / 8) = eight_pixels; } int bytes = int(width / 8.0 + 0.5); if (TIFFWriteScanline(image, scan_line.data(), i, bytes) != 1) std::cerr << "Something went wrong\n"; } TIFFClose(image); } ```
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6 changed files with 388 additions and 1 deletions
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@ -406,6 +406,18 @@ TEST_CASE(test_tiff_uncompressed)
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EXPECT_EQ(frame.image->get_pixel(60, 75), Gfx::Color::NamedColor::Red);
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}
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TEST_CASE(test_tiff_ccitt3_1d)
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{
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auto file = MUST(Core::MappedFile::map(TEST_INPUT("tiff/ccitt3_1d.tiff"sv)));
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EXPECT(Gfx::TIFFImageDecoderPlugin::sniff(file->bytes()));
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auto plugin_decoder = TRY_OR_FAIL(Gfx::TIFFImageDecoderPlugin::create(file->bytes()));
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auto frame = TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 400, 300 }));
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EXPECT_EQ(frame.image->get_pixel(0, 0), Gfx::Color::NamedColor::White);
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EXPECT_EQ(frame.image->get_pixel(60, 75), Gfx::Color::NamedColor::Black);
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}
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TEST_CASE(test_tiff_lzw)
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{
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auto file = MUST(Core::MappedFile::map(TEST_INPUT("tiff/lzw.tiff"sv)));
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