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https://github.com/id-Software/DOOM-3-BFG.git
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d949bc9410
many of the warnings -Wreorder and #includes with invalid path because of case-errors (windows may not care, but linux does)
145 lines
5.5 KiB
C++
145 lines
5.5 KiB
C++
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#include "../Shared/Shared.h"
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#include "../Common/Common.h"
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/*
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* Include file for users of JPEG library.
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* You will need to have included system headers that define at least
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* the typedefs FILE and size_t before you can include jpeglib.h.
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* (stdio.h is sufficient on ANSI-conforming systems.)
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* You may also wish to include "jerror.h".
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*/
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#include "jpeglib.h"
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int LoadJPG( const char * filename, unsigned char ** pic, int * width, int * height ) {
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/* This struct contains the JPEG decompression parameters and pointers to
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* working space (which is allocated as needed by the JPEG library).
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*/
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struct jpeg_decompress_struct cinfo;
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/* We use our private extension JPEG error handler.
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* Note that this struct must live as long as the main JPEG parameter
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* struct, to avoid dangling-pointer problems.
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*/
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/* This struct represents a JPEG error handler. It is declared separately
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* because applications often want to supply a specialized error handler
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* (see the second half of this file for an example). But here we just
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* take the easy way out and use the standard error handler, which will
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* print a message on stderr and call exit() if compression fails.
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* Note that this struct must live as long as the main JPEG parameter
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* struct, to avoid dangling-pointer problems.
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*/
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struct jpeg_error_mgr jerr;
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/* More stuff */
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fileHandle_t infile; /* source file */
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JSAMPARRAY buffer; /* Output row buffer */
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int row_stride; /* physical row width in output buffer */
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unsigned char * out;
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/* In this example we want to open the input file before doing anything else,
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* so that the setjmp() error recovery below can assume the file is open.
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* VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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* requires it in order to read binary files.
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*/
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FS_FOpenFileRead( filename, &infile, qfalse );
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if ( infile == 0 ) {
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return 0;
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}
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/* Step 1: allocate and initialize JPEG decompression object */
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/* We have to set up the error handler first, in case the initialization
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* step fails. (Unlikely, but it could happen if you are out of memory.)
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* This routine fills in the contents of struct jerr, and returns jerr's
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* address which we place into the link field in cinfo.
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*/
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cinfo.err = jpeg_std_error( &jerr );
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/* Now we can initialize the JPEG decompression object. */
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jpeg_create_decompress( &cinfo );
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/* Step 2: specify data source (eg, a file) */
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jpeg_stdio_src( &cinfo, infile );
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/* Step 3: read file parameters with jpeg_read_header() */
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(void) jpeg_read_header( &cinfo, TRUE );
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/* We can ignore the return value from jpeg_read_header since
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* (a) suspension is not possible with the stdio data source, and
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* (b) we passed TRUE to reject a tables-only JPEG file as an error.
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* See libjpeg.doc for more info.
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*/
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/* Step 4: set parameters for decompression */
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/* In this example, we don't need to change any of the defaults set by
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* jpeg_read_header(), so we do nothing here.
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*/
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/* Step 5: Start decompressor */
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(void) jpeg_start_decompress( &cinfo );
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/* We can ignore the return value since suspension is not possible
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* with the stdio data source.
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*/
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/* We may need to do some setup of our own at this point before reading
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* the data. After jpeg_start_decompress() we have the correct scaled
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* output image dimensions available, as well as the output colormap
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* if we asked for color quantization.
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* In this example, we need to make an output work buffer of the right size.
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*/
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/* JSAMPLEs per row in output buffer */
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row_stride = cinfo.output_width * cinfo.output_components;
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out = Z_Malloc( cinfo.output_width * cinfo.output_height * cinfo.output_components );
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*pic = out;
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*width = cinfo.output_width;
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*height = cinfo.output_height;
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/* Step 6: while (scan lines remain to be read) */
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/* jpeg_read_scanlines(...); */
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/* Here we use the library's state variable cinfo.output_scanline as the
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* loop counter, so that we don't have to keep track ourselves.
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*/
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while ( cinfo.output_scanline < cinfo.output_height ) {
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/* jpeg_read_scanlines expects an array of pointers to scanlines.
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* Here the array is only one element long, but you could ask for
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* more than one scanline at a time if that's more convenient.
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*/
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buffer = (JSAMPARRAY)out + ( row_stride * cinfo.output_scanline );
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(void) jpeg_read_scanlines( &cinfo, buffer, 1 );
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}
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/* Step 7: Finish decompression */
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(void) jpeg_finish_decompress( &cinfo );
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/* We can ignore the return value since suspension is not possible
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* with the stdio data source.
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*/
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/* Step 8: Release JPEG decompression object */
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/* This is an important step since it will release a good deal of memory. */
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jpeg_destroy_decompress( &cinfo );
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/* After finish_decompress, we can close the input file.
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* Here we postpone it until after no more JPEG errors are possible,
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* so as to simplify the setjmp error logic above. (Actually, I don't
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* think that jpeg_destroy can do an error exit, but why assume anything...)
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*/
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FS_FCloseFile( infile );
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/* At this point you may want to check to see whether any corrupt-data
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* warnings occurred (test whether jerr.pub.num_warnings is nonzero).
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*/
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/* And we're done! */
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return 1;
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}
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