41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
// Copyright (2019-2024) Paul Scherrer Institute
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#ifdef JFJOCH_USE_JPEG
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#include <cstdio>
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#include <cstdint>
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#include <cstddef>
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#include <vector>
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#include <jpeglib.h>
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#endif
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void WriteJPEG(const std::vector<char> &input, size_t width, size_t height) {
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unsigned char *buf;
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unsigned long buf_size;
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_compress(&cinfo);
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jpeg_mem_dest(&cinfo, &buf, &buf_size);
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cinfo.image_width = width;
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cinfo.image_height = height;
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cinfo.input_components = 3;
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cinfo.in_color_space = JCS_RGB;
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jpeg_set_defaults(&cinfo);
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/*set the quality [0..100] */
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jpeg_set_quality (&cinfo, 75, true);
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jpeg_start_compress(&cinfo, true);
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JSAMPROW row_pointer; /* pointer to a single row */
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while (cinfo.next_scanline < cinfo.image_height) {
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row_pointer = (JSAMPROW) (input.data() + cinfo.next_scanline*(sizeof(char)>>3)*width);
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jpeg_write_scanlines(&cinfo, &row_pointer, 1);
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}
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jpeg_finish_compress(&cinfo);
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jpeg_destroy_compress(&cinfo);
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} |