gd_jpeg.c

PHP v6.0 For Linux 运行环境：Win9X/ WinME/ WinNT/ Win2K/ WinXP

/*
 * gd_jpeg.c: Read and write JPEG (JFIF) format image files using the
 * gd graphics library (http://www.boutell.com/gd/).
 *
 * This software is based in part on the work of the Independent JPEG
 * Group.  For more information on the IJG JPEG software (and JPEG
 * documentation, etc.), see ftp://ftp.uu.net/graphics/jpeg/.
 *
 * NOTE: IJG 12-bit JSAMPLE (BITS_IN_JSAMPLE == 12) mode is not
 * supported at all on read in gd 2.0, and is not supported on write
 * except for palette images, which is sort of pointless (TBB). Even that
 * has never been tested according to DB.
 *
 * Copyright 2000 Doug Becker, mailto:[e-mail]
 *
 * Modification 4/18/00 TBB: JPEG_DEBUG rather than just DEBUG,
 * so VC++ builds don't spew to standard output, causing
 * major CGI brain damage
 *
 * 2.0.10: more efficient gdImageCreateFromJpegCtx, thanks to
 * Christian Aberger
 */

#include <stdio.h>
#include <stdlib.h>
#include <setjmp.h>
#include <limits.h>
#include <string.h>

#include "gd.h"
/* TBB: move this up so include files are not brought in */
/* JCE: arrange HAVE_LIBJPEG so that it can be set in gd.h */
#ifdef HAVE_LIBJPEG
#include "gdhelpers.h"
#undef HAVE_STDLIB_H

/* 1.8.1: remove dependency on jinclude.h */
#include "jpeglib.h"
#include "jerror.h"

static const char *const GD_JPEG_VERSION = "1.0";

typedef struct _jmpbuf_wrapper
{
	jmp_buf jmpbuf;
	int ignore_warning;
} jmpbuf_wrapper;

static long php_jpeg_emit_message(j_common_ptr jpeg_info, int level)
{
	char message[JMSG_LENGTH_MAX];
	jmpbuf_wrapper *jmpbufw;
	int ignore_warning = 0;
	
    jmpbufw = (jmpbuf_wrapper *) jpeg_info->client_data;

	if (jmpbufw != 0) {
		ignore_warning = jmpbufw->ignore_warning;
	}

	(jpeg_info->err->format_message)(jpeg_info,message);

	/* It is a warning message */
	if (level < 0) {
		/* display only the 1st warning, as would do a default libjpeg
		 * unless strace_level >= 3
		 */
		if ((jpeg_info->err->num_warnings == 0) || (jpeg_info->err->trace_level >= 3)) {
			php_gd_error_ex(ignore_warning ? E_NOTICE : E_WARNING, "gd-jpeg, libjpeg: recoverable error: %s\n", message);
		}

		jpeg_info->err->num_warnings++;
	} else {
		/* strace msg, Show it if trace_level >= level. */
		if (jpeg_info->err->trace_level >= level) {
			php_gd_error_ex(E_NOTICE, "gd-jpeg, libjpeg: strace message: %s\n", message);
		}
	}
	return 1;
}



/* Called by the IJG JPEG library upon encountering a fatal error */
static void fatal_jpeg_error (j_common_ptr cinfo)
{
	jmpbuf_wrapper *jmpbufw;

	php_gd_error("gd-jpeg: JPEG library reports unrecoverable error: ");
	(*cinfo->err->output_message) (cinfo);

	jmpbufw = (jmpbuf_wrapper *) cinfo->client_data;
	jpeg_destroy (cinfo);

	if (jmpbufw != 0) {
		longjmp (jmpbufw->jmpbuf, 1);
		php_gd_error_ex(E_ERROR, "gd-jpeg: EXTREMELY fatal error: longjmp returned control; terminating");
	} else {
		php_gd_error_ex(E_ERROR, "gd-jpeg: EXTREMELY fatal error: jmpbuf unrecoverable; terminating");
	}

	exit (99);
}

/*
 * Write IM to OUTFILE as a JFIF-formatted JPEG image, using quality
 * QUALITY.  If QUALITY is in the range 0-100, increasing values
 * represent higher quality but also larger image size.  If QUALITY is
 * negative, the IJG JPEG library's default quality is used (which
 * should be near optimal for many applications).  See the IJG JPEG
 * library documentation for more details.
 */

void gdImageJpeg (gdImagePtr im, FILE * outFile, int quality)
{
	gdIOCtx *out = gdNewFileCtx (outFile);
	gdImageJpegCtx (im, out, quality);
	out->gd_free (out);
}

void *gdImageJpegPtr (gdImagePtr im, int *size, int quality)
{
	void *rv;
	gdIOCtx *out = gdNewDynamicCtx (2048, NULL);
	gdImageJpegCtx (im, out, quality);
	rv = gdDPExtractData (out, size);
	out->gd_free (out);

	return rv;
}

void jpeg_gdIOCtx_dest (j_compress_ptr cinfo, gdIOCtx * outfile);

void gdImageJpegCtx (gdImagePtr im, gdIOCtx * outfile, int quality)
{
	struct jpeg_compress_struct cinfo;
	struct jpeg_error_mgr jerr;
	int i, j, jidx;
	/* volatile so we can gdFree it on return from longjmp */
	volatile JSAMPROW row = 0;
	JSAMPROW rowptr[1];
	jmpbuf_wrapper jmpbufw;
	JDIMENSION nlines;
	char comment[255];

	memset (&cinfo, 0, sizeof (cinfo));
	memset (&jerr, 0, sizeof (jerr));

	cinfo.err = jpeg_std_error (&jerr);
	cinfo.client_data = &jmpbufw;
	if (setjmp (jmpbufw.jmpbuf) != 0) {
		/* we're here courtesy of longjmp */
		if (row) {
			gdFree (row);
		}
		return;
	}

	cinfo.err->error_exit = fatal_jpeg_error;

	jpeg_create_compress (&cinfo);

	cinfo.image_width = im->sx;
	cinfo.image_height = im->sy;
	cinfo.input_components = 3;	/* # of color components per pixel */
	cinfo.in_color_space = JCS_RGB;	/* colorspace of input image */
	jpeg_set_defaults (&cinfo);
	if (quality >= 0) {
		jpeg_set_quality (&cinfo, quality, TRUE);
	}

	/* If user requests interlace, translate that to progressive JPEG */
	if (gdImageGetInterlaced (im)) {
		jpeg_simple_progression (&cinfo);
	}

	jpeg_gdIOCtx_dest (&cinfo, outfile);

	row = (JSAMPROW) safe_emalloc(cinfo.image_width * cinfo.input_components, sizeof(JSAMPLE), 0);
	memset(row, 0, cinfo.image_width * cinfo.input_components * sizeof(JSAMPLE));
	rowptr[0] = row;

	jpeg_start_compress (&cinfo, TRUE);

	if (quality >= 0) {
		snprintf(comment, sizeof(comment)-1, "CREATOR: gd-jpeg v%s (using IJG JPEG v%d), quality = %d\n", GD_JPEG_VERSION, JPEG_LIB_VERSION, quality);
	} else {
		snprintf(comment, sizeof(comment)-1, "CREATOR: gd-jpeg v%s (using IJG JPEG v%d), default quality\n", GD_JPEG_VERSION, JPEG_LIB_VERSION);
	}
	jpeg_write_marker (&cinfo, JPEG_COM, (unsigned char *) comment, (unsigned int) strlen (comment));
	if (im->trueColor) {

#if BITS_IN_JSAMPLE == 12
		php_gd_error("gd-jpeg: error: jpeg library was compiled for 12-bit precision. This is mostly useless, because JPEGs on the web are 8-bit and such versions of the jpeg library won't read or write them. GD doesn't support these unusual images. Edit your jmorecfg.h file to specify the correct precision and completely 'make clean' and 'make install' libjpeg again. Sorry");
		goto error;
#endif /* BITS_IN_JSAMPLE == 12 */

		for (i = 0; i < im->sy; i++) {
			for (jidx = 0, j = 0; j < im->sx; j++) {
				int val = im->tpixels[i][j];

				row[jidx++] = gdTrueColorGetRed (val);
				row[jidx++] = gdTrueColorGetGreen (val);
				row[jidx++] = gdTrueColorGetBlue (val);
			}

			nlines = jpeg_write_scanlines (&cinfo, rowptr, 1);
			if (nlines != 1) {
				php_gd_error_ex(E_WARNING, "gd_jpeg: warning: jpeg_write_scanlines returns %u -- expected 1", nlines);
			}
		}
	} else {
		for (i = 0; i < im->sy; i++) {
			for (jidx = 0, j = 0; j < im->sx; j++) {
				int idx = im->pixels[i][j];

				/* NB: Although gd RGB values are ints, their max value is
				 * 255 (see the documentation for gdImageColorAllocate())
				 * -- perfect for 8-bit JPEG encoding (which is the norm)
				 */
#if BITS_IN_JSAMPLE == 8
				row[jidx++] = im->red[idx];
				row[jidx++] = im->green[idx];
				row[jidx++] = im->blue[idx];
#elif BITS_IN_JSAMPLE == 12
				row[jidx++] = im->red[idx] << 4;
				row[jidx++] = im->green[idx] << 4;
				row[jidx++] = im->blue[idx] << 4;
#else
#error IJG JPEG library BITS_IN_JSAMPLE value must be 8 or 12
#endif
			}

			nlines = jpeg_write_scanlines (&cinfo, rowptr, 1);
			if (nlines != 1) {
				php_gd_error_ex(E_WARNING, "gd_jpeg: warning: jpeg_write_scanlines returns %u -- expected 1", nlines);
			}
		}
	}

	jpeg_finish_compress (&cinfo);
	jpeg_destroy_compress (&cinfo);
	gdFree (row);
}

gdImagePtr gdImageCreateFromJpeg (FILE * inFile, int ignore_warning)
{
	gdImagePtr im;
	gdIOCtx *in = gdNewFileCtx(inFile);
	im = gdImageCreateFromJpegCtx(in, ignore_warning);
	in->gd_free (in);

	return im;
}

gdImagePtr gdImageCreateFromJpegPtr (int size, void *data, int ignore_warning)
{
	gdImagePtr im;
	gdIOCtx *in = gdNewDynamicCtxEx(size, data, 0);
	im = gdImageCreateFromJpegCtx(in, ignore_warning);
	in->gd_free(in);

	return im;
}

void jpeg_gdIOCtx_src (j_decompress_ptr cinfo, gdIOCtx * infile);

static int CMYKToRGB(int c, int m, int y, int k, int inverted);


/*
 * Create a gd-format image from the JPEG-format INFILE.  Returns the
 * image, or NULL upon error.
 */
gdImagePtr gdImageCreateFromJpegCtx (gdIOCtx * infile, int ignore_warning)
{
	struct jpeg_decompress_struct cinfo;
	struct jpeg_error_mgr jerr;
	jmpbuf_wrapper jmpbufw;
	/* volatile so we can gdFree them after longjmp */
	volatile JSAMPROW row = 0;
	volatile gdImagePtr im = 0;
	JSAMPROW rowptr[1];
	unsigned int i, j;
	int retval;
	JDIMENSION nrows;
	int channels = 3;
	int inverted = 0;

	memset (&cinfo, 0, sizeof (cinfo));
	memset (&jerr, 0, sizeof (jerr));

	jmpbufw.ignore_warning = ignore_warning;

	cinfo.err = jpeg_std_error (&jerr);
	cinfo.client_data = &jmpbufw;

	cinfo.err->emit_message = (void (*)(j_common_ptr,int)) php_jpeg_emit_message;

	if (setjmp (jmpbufw.jmpbuf) != 0) {
		/* we're here courtesy of longjmp */
		if (row) {
			gdFree (row);
		}
		if (im) {
			gdImageDestroy (im);
		}
		return 0;
	}

	cinfo.err->error_exit = fatal_jpeg_error;

	jpeg_create_decompress (&cinfo);

	jpeg_gdIOCtx_src (&cinfo, infile);

	/* 2.0.22: save the APP14 marker to check for Adobe Photoshop CMYK files with inverted components. */
	jpeg_save_markers(&cinfo, JPEG_APP0 + 14, 256);

	retval = jpeg_read_header (&cinfo, TRUE);
	if (retval != JPEG_HEADER_OK) {
		php_gd_error_ex(E_WARNING, "gd-jpeg: warning: jpeg_read_header returned %d, expected %d", retval, JPEG_HEADER_OK);
	}

	if (cinfo.image_height > INT_MAX) {
		php_gd_error_ex(E_WARNING, "gd-jpeg: warning: JPEG image height (%u) is greater than INT_MAX (%d) (and thus greater than gd can handle)", cinfo.image_height, INT_MAX);
	}

	if (cinfo.image_width > INT_MAX) {
		php_gd_error_ex(E_WARNING, "gd-jpeg: warning: JPEG image width (%u) is greater than INT_MAX (%d) (and thus greater than gd can handle)", cinfo.image_width, INT_MAX);
	}

	im = gdImageCreateTrueColor ((int) cinfo.image_width, (int) cinfo.image_height);
	if (im == 0) {
		php_gd_error("gd-jpeg error: cannot allocate gdImage struct");
		goto error;
	}

	/* 2.0.22: very basic support for reading CMYK colorspace files. Nice for
	 * thumbnails but there's no support for fussy adjustment of the
	 * assumed properties of inks and paper. */
	if ((cinfo.jpeg_color_space == JCS_CMYK) || (cinfo.jpeg_color_space == JCS_YCCK)) {
		cinfo.out_color_space = JCS_CMYK;
	} else {
		cinfo.out_color_space = JCS_RGB;
	}

	if (jpeg_start_decompress (&cinfo) != TRUE) {
		php_gd_error("gd-jpeg: warning: jpeg_start_decompress reports suspended data source");
	}

	/* REMOVED by TBB 2/12/01. This field of the structure is
	 * documented as private, and sure enough it's gone in the
	 * latest libjpeg, replaced by something else. Unfortunately
	 * there is still no right way to find out if the file was
	 * progressive or not; just declare your intent before you
	 * write one by calling gdImageInterlace(im, 1) yourself.
	 * After all, we're not really supposed to rework JPEGs and
	 * write them out again anyway. Lossy compression, remember?
	 */
#if 0
  gdImageInterlace (im, cinfo.progressive_mode != 0);
#endif

	if (cinfo.out_color_space == JCS_RGB) {
		if (cinfo.output_components != 3) {
			php_gd_error_ex(E_WARNING, "gd-jpeg: error: JPEG color quantization request resulted in output_components == %d (expected 3 for RGB)", cinfo.output_components);
			goto error;
		}
		channels = 3;
	} else if (cinfo.out_color_space == JCS_CMYK) {
		jpeg_saved_marker_ptr marker;
		if (cinfo.output_components != 4)  {
			php_gd_error_ex(E_WARNING, "gd-jpeg: error: JPEG color quantization request resulted in output_components == %d (expected 4 for CMYK)", cinfo.output_components);
			goto error;
		}
		channels = 4;
		marker = cinfo.marker_list;
		while (marker) {
			if ((marker->marker == (JPEG_APP0 + 14)) && (marker->data_length >= 12) && (!strncmp((const char *) marker->data, "Adobe", 5))) {
				inverted = 1;
				break;
			}
			marker = marker->next;
		}
	} else {
		php_gd_error_ex(E_WARNING, "gd-jpeg: error: unexpected colorspace.");
		goto error;
	}

#if BITS_IN_JSAMPLE == 12
	php_gd_error("gd-jpeg: error: jpeg library was compiled for 12-bit precision. This is mostly useless, because JPEGs on the web are 8-bit and such versions of the jpeg library won't read or write them. GD doesn't support these unusual images. Edit your jmorecfg.h file to specify the correct precision and completely 'make clean' and 'make install' libjpeg again. Sorry.");
	goto error;
#endif /* BITS_IN_JSAMPLE == 12 */

	row = safe_emalloc(cinfo.output_width * channels, sizeof(JSAMPLE), 0);
	memset(row, 0, cinfo.output_width * channels * sizeof(JSAMPLE));
	rowptr[0] = row;

	if (cinfo.out_color_space == JCS_CMYK) {
		for (i = 0; i < cinfo.output_height; i++) {
			register JSAMPROW currow = row;
			register int *tpix = im->tpixels[i];