235 lines
6.9 KiB
C++
235 lines
6.9 KiB
C++
// Filename:- JPGFile.cpp
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#include "stdafx.h"
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#include "oddbits.h"
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#include "jpgfile.h"
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#include "../libs/pakstuff.h"
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#include "jpeg-6/jpeglib.h"
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// bool return really, but needs an int to match header proto which is included by a C file, and MS C compiler
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// doesn't like bool types
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//
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int LoadJPG( const char *filename, unsigned char **pic, int *width, int *height )
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{
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bool bReturn = true;
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*pic = NULL;
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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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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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byte *fbuffer;
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byte *bbuf;
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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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//stefix
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#if 0
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ri.FS_ReadFile ( ( char * ) filename, (void **)&fbuffer);
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if (!fbuffer)
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return false;
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#else
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int iLoadedLen = LoadFile (filename, (void **)&fbuffer);
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if (iLoadedLen == -1)
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{
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iLoadedLen = PakLoadAnyFile(filename, (void **)&fbuffer);
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if (iLoadedLen == -1)
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{
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return false;
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}
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}
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#endif
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try
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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, fbuffer);
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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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if (cinfo.output_components!=4 && cinfo.output_components!=1 )
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{
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throw(va("JPG %s is unsupported color depth (%d)\n", filename, cinfo.output_components));
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}
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out = (byte *)malloc(cinfo.output_width*cinfo.output_height*4);
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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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bbuf = ((out+(row_stride*cinfo.output_scanline)));
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buffer = &bbuf;
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(void) jpeg_read_scanlines(&cinfo, buffer, 1);
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}
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// if we've just loaded a greyscale, then adjust it from 8-bit to 32bit by stretch-copying it over itself...
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// (this also does the alpha stuff as well)
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//
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if (cinfo.output_components == 1)
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{
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byte *pbDest = (*pic + (cinfo.output_width * cinfo.output_height * 4))-1;
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byte *pbSrc = (*pic + (cinfo.output_width * cinfo.output_height ))-1;
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int iPixels = cinfo.output_width * cinfo.output_height;
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for (int i=0; i<iPixels; i++)
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{
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byte b = *pbSrc--;
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*pbDest-- = 255;
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*pbDest-- = b;
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*pbDest-- = b;
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*pbDest-- = b;
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}
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}
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else
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{// clear all the alphas to 255
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int i, j;
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byte *buf;
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buf = *pic;
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j = cinfo.output_width * cinfo.output_height * 4;
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for ( i = 3 ; i < j ; i+=4 ) {
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buf[i] = 255;
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}
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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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}
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catch(LPCSTR psMessage)
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{
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//ErrorBox
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Sys_Printf(va("JPEG read error: %s",psMessage));
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jpeg_destroy_decompress(&cinfo);
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bReturn = false;
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if (*pic)
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{
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free(*pic);
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*pic = NULL;
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}
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}
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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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//stefix
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#if 0
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ri.FS_FreeFile (fbuffer);
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#else
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free(fbuffer);
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#endif
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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 bReturn;
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}
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void JPG_ErrorThrow(LPCSTR message)
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{
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throw (message);
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}
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void JPG_MessageOut(LPCSTR message)
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{
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OutputDebugString(va("%s\n",message));
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}
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//////////////// eof ////////////
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