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497 lines
17 KiB
C
497 lines
17 KiB
C
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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#include "tr_local.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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#define JPEG_INTERNALS
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#include "../jpeg-6b/jpeglib.h"
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void R_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 = {NULL};
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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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unsigned row_stride; /* physical row width in output buffer */
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unsigned pixelcount, memcount;
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unsigned char *out;
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int len;
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union {
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byte *b;
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void *v;
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} fbuffer;
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byte *buf;
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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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len = ri.FS_ReadFile ( ( char * ) filename, &fbuffer.v);
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if (!fbuffer.b || len < 0) {
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return;
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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_mem_src(&cinfo, fbuffer.b, len);
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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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pixelcount = cinfo.output_width * cinfo.output_height;
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if(!cinfo.output_width || !cinfo.output_height
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|| ((pixelcount * 4) / cinfo.output_width) / 4 != cinfo.output_height
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|| pixelcount > 0x1FFFFFFF || cinfo.output_components > 4) // 4*1FFFFFFF == 0x7FFFFFFC < 0x7FFFFFFF
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{
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ri.Error (ERR_DROP, "LoadJPG: %s has an invalid image size: %dx%d*4=%d, components: %d\n", filename,
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cinfo.output_width, cinfo.output_height, pixelcount * 4, cinfo.output_components);
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}
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memcount = pixelcount * 4;
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row_stride = cinfo.output_width * cinfo.output_components;
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out = ri.Malloc(memcount);
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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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buf = ((out+(row_stride*cinfo.output_scanline)));
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buffer = &buf;
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(void) jpeg_read_scanlines(&cinfo, buffer, 1);
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}
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buf = out;
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// If we are processing an 8-bit JPEG (greyscale), we'll have to convert
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// the greyscale values to RGBA.
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if(cinfo.output_components == 1)
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{
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int sindex = pixelcount, dindex = memcount;
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unsigned char greyshade;
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// Only pixelcount number of bytes have been written.
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// Expand the color values over the rest of the buffer, starting
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// from the end.
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do
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{
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greyshade = buf[--sindex];
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buf[--dindex] = 255;
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buf[--dindex] = greyshade;
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buf[--dindex] = greyshade;
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buf[--dindex] = greyshade;
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} while(sindex);
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}
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else
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{
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// clear all the alphas to 255
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int i;
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for ( i = 3 ; i < memcount ; i+=4 )
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{
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buf[i] = 255;
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}
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}
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*pic = out;
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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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ri.FS_FreeFile (fbuffer.v);
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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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}
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/* Expanded data destination object for stdio output */
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typedef struct {
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struct jpeg_destination_mgr pub; /* public fields */
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byte* outfile; /* target stream */
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int size;
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} my_destination_mgr;
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typedef my_destination_mgr * my_dest_ptr;
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/*
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* Initialize destination --- called by jpeg_start_compress
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* before any data is actually written.
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*/
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static void
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init_destination (j_compress_ptr cinfo)
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{
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my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
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dest->pub.next_output_byte = dest->outfile;
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dest->pub.free_in_buffer = dest->size;
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}
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/*
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* Empty the output buffer --- called whenever buffer fills up.
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*
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* In typical applications, this should write the entire output buffer
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* (ignoring the current state of next_output_byte & free_in_buffer),
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* reset the pointer & count to the start of the buffer, and return TRUE
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* indicating that the buffer has been dumped.
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*
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* In applications that need to be able to suspend compression due to output
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* overrun, a FALSE return indicates that the buffer cannot be emptied now.
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* In this situation, the compressor will return to its caller (possibly with
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* an indication that it has not accepted all the supplied scanlines). The
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* application should resume compression after it has made more room in the
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* output buffer. Note that there are substantial restrictions on the use of
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* suspension --- see the documentation.
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*
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* When suspending, the compressor will back up to a convenient restart point
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* (typically the start of the current MCU). next_output_byte & free_in_buffer
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* indicate where the restart point will be if the current call returns FALSE.
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* Data beyond this point will be regenerated after resumption, so do not
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* write it out when emptying the buffer externally.
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*/
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static boolean
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empty_output_buffer (j_compress_ptr cinfo)
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{
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return TRUE;
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}
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/*
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* Terminate destination --- called by jpeg_finish_compress
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* after all data has been written. Usually needs to flush buffer.
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*
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* NB: *not* called by jpeg_abort or jpeg_destroy; surrounding
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* application must deal with any cleanup that should happen even
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* for error exit.
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*/
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static int hackSize;
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static void
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term_destination (j_compress_ptr cinfo)
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{
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my_dest_ptr dest = (my_dest_ptr) cinfo->dest;
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size_t datacount = dest->size - dest->pub.free_in_buffer;
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hackSize = datacount;
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}
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/*
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* Prepare for output to a stdio stream.
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* The caller must have already opened the stream, and is responsible
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* for closing it after finishing compression.
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*/
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static void
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jpegDest (j_compress_ptr cinfo, byte* outfile, int size)
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{
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my_dest_ptr dest;
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/* The destination object is made permanent so that multiple JPEG images
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* can be written to the same file without re-executing jpeg_stdio_dest.
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* This makes it dangerous to use this manager and a different destination
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* manager serially with the same JPEG object, because their private object
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* sizes may be different. Caveat programmer.
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*/
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if (cinfo->dest == NULL) { /* first time for this JPEG object? */
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cinfo->dest = (struct jpeg_destination_mgr *)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
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sizeof(my_destination_mgr));
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}
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dest = (my_dest_ptr) cinfo->dest;
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dest->pub.init_destination = init_destination;
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dest->pub.empty_output_buffer = empty_output_buffer;
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dest->pub.term_destination = term_destination;
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dest->outfile = outfile;
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dest->size = size;
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}
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void SaveJPG(char * filename, int quality, int image_width, int image_height, unsigned char *image_buffer) {
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/* This struct contains the JPEG compression parameters and pointers to
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* working space (which is allocated as needed by the JPEG library).
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* It is possible to have several such structures, representing multiple
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* compression/decompression processes, in existence at once. We refer
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* to any one struct (and its associated working data) as a "JPEG object".
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*/
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struct jpeg_compress_struct cinfo;
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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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JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
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int row_stride; /* physical row width in image buffer */
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unsigned char *out;
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/* Step 1: allocate and initialize JPEG compression 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 compression object. */
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jpeg_create_compress(&cinfo);
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/* Step 2: specify data destination (eg, a file) */
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/* Note: steps 2 and 3 can be done in either order. */
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/* Here we use the library-supplied code to send compressed data to a
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* stdio stream. You can also write your own code to do something else.
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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 write binary files.
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*/
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out = ri.Hunk_AllocateTempMemory(image_width*image_height*4);
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jpegDest(&cinfo, out, image_width*image_height*4);
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/* Step 3: set parameters for compression */
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/* First we supply a description of the input image.
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* Four fields of the cinfo struct must be filled in:
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*/
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cinfo.image_width = image_width; /* image width and height, in pixels */
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cinfo.image_height = image_height;
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cinfo.input_components = 4; /* # of color components per pixel */
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cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
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/* Now use the library's routine to set default compression parameters.
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* (You must set at least cinfo.in_color_space before calling this,
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* since the defaults depend on the source color space.)
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*/
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jpeg_set_defaults(&cinfo);
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/* Now you can set any non-default parameters you wish to.
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* Here we just illustrate the use of quality (quantization table) scaling:
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*/
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jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
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/* If quality is set high, disable chroma subsampling */
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if (quality >= 85) {
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cinfo.comp_info[0].h_samp_factor = 1;
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cinfo.comp_info[0].v_samp_factor = 1;
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}
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/* Step 4: Start compressor */
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/* TRUE ensures that we will write a complete interchange-JPEG file.
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* Pass TRUE unless you are very sure of what you're doing.
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*/
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jpeg_start_compress(&cinfo, TRUE);
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/* Step 5: while (scan lines remain to be written) */
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/* jpeg_write_scanlines(...); */
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/* Here we use the library's state variable cinfo.next_scanline as the
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* loop counter, so that we don't have to keep track ourselves.
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* To keep things simple, we pass one scanline per call; you can pass
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* more if you wish, though.
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*/
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row_stride = image_width * 4; /* JSAMPLEs per row in image_buffer */
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while (cinfo.next_scanline < cinfo.image_height) {
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/* jpeg_write_scanlines expects an array of pointers to scanlines.
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* Here the array is only one element long, but you could pass
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* more than one scanline at a time if that's more convenient.
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*/
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row_pointer[0] = & image_buffer[((cinfo.image_height-1)*row_stride)-cinfo.next_scanline * row_stride];
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(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
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}
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/* Step 6: Finish compression */
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jpeg_finish_compress(&cinfo);
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/* After finish_compress, we can close the output file. */
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ri.FS_WriteFile( filename, out, hackSize );
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ri.Hunk_FreeTempMemory(out);
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/* Step 7: release JPEG compression 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_compress(&cinfo);
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/* And we're done! */
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}
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/*
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=================
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SaveJPGToBuffer
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=================
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*/
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int SaveJPGToBuffer( byte *buffer, int quality,
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int image_width, int image_height,
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byte *image_buffer )
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{
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struct jpeg_compress_struct cinfo;
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struct jpeg_error_mgr jerr;
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JSAMPROW row_pointer[1]; /* pointer to JSAMPLE row[s] */
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int row_stride; /* physical row width in image buffer */
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/* Step 1: allocate and initialize JPEG compression object */
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cinfo.err = jpeg_std_error(&jerr);
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/* Now we can initialize the JPEG compression object. */
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jpeg_create_compress(&cinfo);
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/* Step 2: specify data destination (eg, a file) */
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/* Note: steps 2 and 3 can be done in either order. */
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jpegDest(&cinfo, buffer, image_width*image_height*4);
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/* Step 3: set parameters for compression */
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cinfo.image_width = image_width; /* image width and height, in pixels */
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cinfo.image_height = image_height;
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cinfo.input_components = 4; /* # of color components per pixel */
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cinfo.in_color_space = JCS_RGB; /* colorspace of input image */
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jpeg_set_defaults(&cinfo);
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jpeg_set_quality(&cinfo, quality, TRUE /* limit to baseline-JPEG values */);
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/* If quality is set high, disable chroma subsampling */
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if (quality >= 85) {
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cinfo.comp_info[0].h_samp_factor = 1;
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cinfo.comp_info[0].v_samp_factor = 1;
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}
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/* Step 4: Start compressor */
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jpeg_start_compress(&cinfo, TRUE);
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/* Step 5: while (scan lines remain to be written) */
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/* jpeg_write_scanlines(...); */
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row_stride = image_width * 4; /* JSAMPLEs per row in image_buffer */
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while (cinfo.next_scanline < cinfo.image_height) {
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/* jpeg_write_scanlines expects an array of pointers to scanlines.
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* Here the array is only one element long, but you could pass
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* more than one scanline at a time if that's more convenient.
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*/
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row_pointer[0] = & image_buffer[((cinfo.image_height-1)*row_stride)-cinfo.next_scanline * row_stride];
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(void) jpeg_write_scanlines(&cinfo, row_pointer, 1);
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}
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|
|
/* Step 6: Finish compression */
|
|
jpeg_finish_compress(&cinfo);
|
|
|
|
/* Step 7: release JPEG compression object */
|
|
jpeg_destroy_compress(&cinfo);
|
|
|
|
/* And we're done! */
|
|
return hackSize;
|
|
}
|