121 lines
2.7 KiB
C++
121 lines
2.7 KiB
C++
#include "inputImage.h"
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const static JOCTET EOI_BUFFER[1] = { JPEG_EOI };
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inputImage::inputImage()
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{
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}
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void inputImage::setImageData(const std::string& data)
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{
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decompressImage(data.c_str(), data.size());
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}
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unsigned int inputImage::width() const
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{
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return m_width;
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}
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unsigned int inputImage::height() const
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{
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return m_height;
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}
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unsigned int inputImage::strideX() const
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{
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return m_strideX;
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}
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unsigned int inputImage::strideY() const
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{
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return m_strideY;
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}
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const std::vector<char>& inputImage::data() const
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{
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return m_data;
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}
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void inputImage::init_source(j_decompress_ptr pCinfo)
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{
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}
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boolean inputImage::fill_input_buffer(j_decompress_ptr pCinfo)
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{
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source_mgr_ptr pSrc = reinterpret_cast<source_mgr_ptr>(pCinfo->src);
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pSrc->pub.next_input_byte = EOI_BUFFER;
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pSrc->pub.bytes_in_buffer = 1;
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return TRUE;
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}
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void inputImage::skip_input_data(j_decompress_ptr pCinfo, long numBytes)
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{
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source_mgr_ptr pSrc = reinterpret_cast<source_mgr_ptr>(pCinfo->src);
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if (pSrc->pub.bytes_in_buffer < numBytes)
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{
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pSrc->pub.next_input_byte = EOI_BUFFER;
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pSrc->pub.bytes_in_buffer = 1;
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}
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else
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{
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pSrc->pub.next_input_byte += numBytes;
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pSrc->pub.bytes_in_buffer -= numBytes;
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}
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}
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void inputImage::term_source(j_decompress_ptr pCinfo)
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{
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}
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void inputImage::setSourceMgr(j_decompress_ptr pCinfo, const char* pData, size_t len) const
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{
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source_mgr_ptr pSrc;
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if (pCinfo->src == 0)
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pCinfo->src = (struct jpeg_source_mgr *)(*pCinfo->mem->alloc_small)(reinterpret_cast<j_common_ptr>(pCinfo), JPOOL_PERMANENT, sizeof(source_mgr));
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pSrc = reinterpret_cast<source_mgr_ptr>(pCinfo->src);
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pSrc->pub.init_source = inputImage::init_source;
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pSrc->pub.fill_input_buffer = inputImage::fill_input_buffer;
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pSrc->pub.skip_input_data = inputImage::skip_input_data;
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pSrc->pub.resync_to_restart = jpeg_resync_to_restart;
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pSrc->pub.term_source = inputImage::term_source;
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pSrc->data = (const JOCTET *)pData;
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pSrc->len = len;
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pSrc->pub.bytes_in_buffer = len;
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pSrc->pub.next_input_byte = pSrc->data;
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}
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void inputImage::decompressImage(const char* pData, size_t len)
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{
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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jerr.trace_level = 0;
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&cinfo);
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setSourceMgr(&cinfo, pData, len);
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jpeg_read_header(&cinfo, TRUE);
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jpeg_start_decompress(&cinfo);
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m_width = cinfo.image_width;
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m_height = cinfo.image_height;
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m_strideX = cinfo.num_components;
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m_strideY = m_width * cinfo.num_components;
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m_data.resize(m_height * m_strideY);
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JSAMPROW scanlines[1];
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while (cinfo.output_scanline < cinfo.image_height)
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{
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scanlines[0] = reinterpret_cast<JSAMPROW>(&m_data[cinfo.output_scanline * m_strideY]);
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jpeg_read_scanlines(&cinfo, scanlines, 1);
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}
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jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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}
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