gd.c

/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Rasmus Lerdorf <rasmus@php.net>                             |
   |          Stig Bakken <ssb@php.net>                                   |
   |          Jim Winstead <jimw@php.net>                                 |
   +----------------------------------------------------------------------+
 */

/* gd 1.2 is copyright 1994, 1995, Quest Protein Database Center,
   Cold Spring Harbor Labs. */

/* Note that there is no code from the gd package in this file */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "php_ini.h"
#include "ext/standard/head.h"
#include <math.h>
#include "SAPI.h"
#include "php_gd.h"
#include "ext/standard/php_image.h"
#include "ext/standard/info.h"
#include "php_open_temporary_file.h"
#include "php_memory_streams.h"
#include "zend_object_handlers.h"

#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef PHP_WIN32
# include <io.h>
# include <fcntl.h>
# include <windows.h>
# include <Winuser.h>
# include <Wingdi.h>
#endif

#if defined(HAVE_GD_XPM) && defined(HAVE_GD_BUNDLED)
# include <X11/xpm.h>
#endif

#include "gd_compat.h"

#ifdef HAVE_GD_BUNDLED
# include "libgd/gd.h"
# include "libgd/gd_errors.h"
# include "libgd/gdfontt.h"  /* 1 Tiny font */
# include "libgd/gdfonts.h"  /* 2 Small font */
# include "libgd/gdfontmb.h" /* 3 Medium bold font */
# include "libgd/gdfontl.h"  /* 4 Large font */
# include "libgd/gdfontg.h"  /* 5 Giant font */
#else
# include <gd.h>
# include <gd_errors.h>
# include <gdfontt.h>  /* 1 Tiny font */
# include <gdfonts.h>  /* 2 Small font */
# include <gdfontmb.h> /* 3 Medium bold font */
# include <gdfontl.h>  /* 4 Large font */
# include <gdfontg.h>  /* 5 Giant font */
#endif

#if defined(HAVE_GD_FREETYPE) && defined(HAVE_GD_BUNDLED)
# include <ft2build.h>
# include FT_FREETYPE_H
#endif

#if defined(HAVE_GD_XPM) && defined(HAVE_GD_BUNDLED)
# include "X11/xpm.h"
#endif

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

/* don't used libgd constants, not used, so going to be removed */
#define PHP_GD_FLIP_HORIZONTAL 1
#define PHP_GD_FLIP_VERTICAL   2
#define PHP_GD_FLIP_BOTH       3

#ifdef HAVE_GD_FREETYPE
static void php_imagettftext_common(INTERNAL_FUNCTION_PARAMETERS, int);
#endif

#include "gd_arginfo.h"

/* as it is not really public, duplicate declaration here to avoid
   pointless warnings */
int overflow2(int a, int b);

/* Section Filters Declarations */
/* IMPORTANT NOTE FOR NEW FILTER
 * Do not forget to update:
 * IMAGE_FILTER_MAX: define the last filter index
 * IMAGE_FILTER_MAX_ARGS: define the biggest amount of arguments
 * image_filter array in PHP_FUNCTION(imagefilter)
 * */
#define IMAGE_FILTER_NEGATE         0
#define IMAGE_FILTER_GRAYSCALE      1
#define IMAGE_FILTER_BRIGHTNESS     2
#define IMAGE_FILTER_CONTRAST       3
#define IMAGE_FILTER_COLORIZE       4
#define IMAGE_FILTER_EDGEDETECT     5
#define IMAGE_FILTER_EMBOSS         6
#define IMAGE_FILTER_GAUSSIAN_BLUR  7
#define IMAGE_FILTER_SELECTIVE_BLUR 8
#define IMAGE_FILTER_MEAN_REMOVAL   9
#define IMAGE_FILTER_SMOOTH         10
#define IMAGE_FILTER_PIXELATE       11
#define IMAGE_FILTER_SCATTER		12
#define IMAGE_FILTER_MAX            12
#define IMAGE_FILTER_MAX_ARGS       6
static void php_image_filter_negate(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_grayscale(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_brightness(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_contrast(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_colorize(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_edgedetect(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_emboss(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_gaussian_blur(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_selective_blur(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_mean_removal(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_smooth(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_pixelate(INTERNAL_FUNCTION_PARAMETERS);
static void php_image_filter_scatter(INTERNAL_FUNCTION_PARAMETERS);

/* End Section filters declarations */
static gdImagePtr _php_image_create_from_string(zend_string *Data, char *tn, gdImagePtr (*ioctx_func_p)(gdIOCtxPtr));
static void _php_image_create_from(INTERNAL_FUNCTION_PARAMETERS, int image_type, char *tn, gdImagePtr (*func_p)(FILE *), gdImagePtr (*ioctx_func_p)(gdIOCtxPtr));
static void _php_image_output(INTERNAL_FUNCTION_PARAMETERS, int image_type, char *tn);
static gdIOCtx *create_stream_context_from_zval(zval *to_zval);
static gdIOCtx *create_stream_context(php_stream *stream, int close_stream);
static gdIOCtx *create_output_context(void);
static int _php_image_type(zend_string *data);

/* output streaming (formerly gd_ctx.c) */
static void _php_image_output_ctx(INTERNAL_FUNCTION_PARAMETERS, int image_type, char *tn);

/*********************************************************
 *
 * GD Object Representation
 *
 ********************************************************/

zend_class_entry *gd_image_ce;

typedef struct _gd_ext_image_object {
	gdImagePtr image;
	zend_object std;
} php_gd_image_object;

static zend_object_handlers php_gd_image_object_handlers;

static zend_function *php_gd_image_object_get_constructor(zend_object *object)
{
	zend_throw_error(NULL, "You cannot initialize a GdImage object except through helper functions");
	return NULL;
}

/**
 * Returns the underlying php_gd_image_object from a zend_object
 */

static zend_always_inline php_gd_image_object* php_gd_exgdimage_from_zobj_p(zend_object* obj)
{
	return (php_gd_image_object *) ((char *) (obj) - XtOffsetOf(php_gd_image_object, std));
}

/**
 * Converts an extension GdImage instance contained within a zval into the gdImagePtr
 * for use with library APIs
 */
PHP_GD_API gdImagePtr php_gd_libgdimageptr_from_zval_p(zval* zp)
{
	return php_gd_exgdimage_from_zobj_p(Z_OBJ_P(zp))->image;
}


zend_object *php_gd_image_object_create(zend_class_entry *class_type)
{
	size_t block_len = sizeof(php_gd_image_object) + zend_object_properties_size(class_type);
	php_gd_image_object *intern = emalloc(block_len);
	memset(intern, 0, block_len);

	zend_object_std_init(&intern->std, class_type);
	object_properties_init(&intern->std, class_type);
	intern->std.handlers = &php_gd_image_object_handlers;

	return &intern->std;
}

static void php_gd_image_object_free(zend_object *intern)
{
	php_gd_image_object *img_obj_ptr = php_gd_exgdimage_from_zobj_p(intern);
	if (img_obj_ptr->image) {
		gdImageDestroy(img_obj_ptr->image);
	}
	zend_object_std_dtor(intern);
}

/**
 * Creates a new GdImage object wrapping the gdImagePtr and attaches it
 * to the zval (usually return_value).
 *
 * This function must only be called once per valid gdImagePtr
 */
void php_gd_assign_libgdimageptr_as_extgdimage(zval *val, gdImagePtr image)
{
	object_init_ex(val, gd_image_ce);
	php_gd_exgdimage_from_zobj_p(Z_OBJ_P(val))->image = image;
}

static void php_gd_object_minit_helper(void)
{
	gd_image_ce = register_class_GdImage();
	gd_image_ce->create_object = php_gd_image_object_create;

	/* setting up the object handlers for the GdImage class */
	memcpy(&php_gd_image_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));
	php_gd_image_object_handlers.clone_obj = NULL;
	php_gd_image_object_handlers.free_obj = php_gd_image_object_free;
	php_gd_image_object_handlers.get_constructor = php_gd_image_object_get_constructor;
	php_gd_image_object_handlers.compare = zend_objects_not_comparable;
	php_gd_image_object_handlers.offset = XtOffsetOf(php_gd_image_object, std);
}

static zend_class_entry *gd_font_ce = NULL;
static zend_object_handlers php_gd_font_object_handlers;

typedef struct _php_gd_font_object {
	gdFontPtr font;
	zend_object std;
} php_gd_font_object;

static php_gd_font_object *php_gd_font_object_from_zend_object(zend_object *zobj)
{
	return ((php_gd_font_object*)(zobj + 1)) - 1;
}

static zend_object *php_gd_font_object_to_zend_object(php_gd_font_object *obj)
{
	return ((zend_object*)(obj + 1)) - 1;
}

static zend_object *php_gd_font_object_create(zend_class_entry *ce)
{
	php_gd_font_object *obj = zend_object_alloc(sizeof(php_gd_font_object), ce);
	zend_object *zobj = php_gd_font_object_to_zend_object(obj);

	obj->font = NULL;
	zend_object_std_init(zobj, ce);
	object_properties_init(zobj, ce);
	zobj->handlers = &php_gd_font_object_handlers;

	return zobj;
}

static void php_gd_font_object_free(zend_object *zobj)
{
	php_gd_font_object *obj = php_gd_font_object_from_zend_object(zobj);

	if (obj->font) {
		if (obj->font->data) {
			efree(obj->font->data);
		}
		efree(obj->font);
		obj->font = NULL;
	}

	zend_object_std_dtor(zobj);
}

static zend_function *php_gd_font_object_get_constructor(zend_object *object)
{
	zend_throw_error(NULL, "You cannot initialize a GdFont object except through helper functions");
	return NULL;
}

static void php_gd_font_minit_helper(void)
{
	gd_font_ce = register_class_GdFont();
	gd_font_ce->create_object = php_gd_font_object_create;

	/* setting up the object handlers for the GdFont class */
	memcpy(&php_gd_font_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));
	php_gd_font_object_handlers.clone_obj = NULL;
	php_gd_font_object_handlers.free_obj = php_gd_font_object_free;
	php_gd_font_object_handlers.get_constructor = php_gd_font_object_get_constructor;
	php_gd_font_object_handlers.offset = XtOffsetOf(php_gd_font_object, std);
}

/*********************************************************
 *
 * Extension Implementation
 *
 ********************************************************/

zend_module_entry gd_module_entry = {
	STANDARD_MODULE_HEADER,
	"gd",
	ext_functions,
	PHP_MINIT(gd),
	PHP_MSHUTDOWN(gd),
	NULL,
	PHP_RSHUTDOWN(gd),
	PHP_MINFO(gd),
	PHP_GD_VERSION,
	STANDARD_MODULE_PROPERTIES
};

#ifdef COMPILE_DL_GD
ZEND_GET_MODULE(gd)
#endif

/* {{{ PHP_INI_BEGIN */
PHP_INI_BEGIN()
	PHP_INI_ENTRY("gd.jpeg_ignore_warning", "1", PHP_INI_ALL, NULL)
PHP_INI_END()
/* }}} */

/* {{{ php_gd_error_method */
void php_gd_error_method(int type, const char *format, va_list args)
{
	switch (type) {
#ifndef PHP_WIN32
		case GD_DEBUG:
		case GD_INFO:
#endif
		case GD_NOTICE:
			type = E_NOTICE;
			break;
		case GD_WARNING:
			type = E_WARNING;
			break;
		default:
			type = E_ERROR;
	}
	php_verror(NULL, "", type, format, args);
}
/* }}} */

/* {{{ PHP_MINIT_FUNCTION */
PHP_MINIT_FUNCTION(gd)
{
	php_gd_object_minit_helper();
	php_gd_font_minit_helper();

#if defined(HAVE_GD_FREETYPE) && defined(HAVE_GD_BUNDLED)
	gdFontCacheMutexSetup();
#endif
	gdSetErrorMethod(php_gd_error_method);

	REGISTER_INI_ENTRIES();

	REGISTER_LONG_CONSTANT("IMG_AVIF", PHP_IMG_AVIF, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_GIF", PHP_IMG_GIF, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_JPG", PHP_IMG_JPG, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_JPEG", PHP_IMG_JPEG, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_PNG", PHP_IMG_PNG, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_WBMP", PHP_IMG_WBMP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_XPM", PHP_IMG_XPM, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_WEBP", PHP_IMG_WEBP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BMP", PHP_IMG_BMP, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_TGA", PHP_IMG_TGA, CONST_CS | CONST_PERSISTENT);

#ifdef gdWebpLossless
	/* constant for webp encoding */
	REGISTER_LONG_CONSTANT("IMG_WEBP_LOSSLESS", gdWebpLossless, CONST_CS | CONST_PERSISTENT);
#endif

	/* special colours for gd */
	REGISTER_LONG_CONSTANT("IMG_COLOR_TILED", gdTiled, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_COLOR_STYLED", gdStyled, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_COLOR_BRUSHED", gdBrushed, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_COLOR_STYLEDBRUSHED", gdStyledBrushed, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_COLOR_TRANSPARENT", gdTransparent, CONST_CS | CONST_PERSISTENT);

	/* for imagefilledarc */
	REGISTER_LONG_CONSTANT("IMG_ARC_ROUNDED", gdArc, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_ARC_PIE", gdPie, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_ARC_CHORD", gdChord, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_ARC_NOFILL", gdNoFill, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_ARC_EDGED", gdEdged, CONST_CS | CONST_PERSISTENT);

	/* GD2 image format types */
	REGISTER_LONG_CONSTANT("IMG_GD2_RAW", GD2_FMT_RAW, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_GD2_COMPRESSED", GD2_FMT_COMPRESSED, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FLIP_HORIZONTAL", PHP_GD_FLIP_HORIZONTAL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FLIP_VERTICAL", PHP_GD_FLIP_VERTICAL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FLIP_BOTH", PHP_GD_FLIP_BOTH, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_EFFECT_REPLACE", gdEffectReplace, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_EFFECT_ALPHABLEND", gdEffectAlphaBlend, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_EFFECT_NORMAL", gdEffectNormal, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_EFFECT_OVERLAY", gdEffectOverlay, CONST_CS | CONST_PERSISTENT);
#ifdef gdEffectMultiply
	REGISTER_LONG_CONSTANT("IMG_EFFECT_MULTIPLY", gdEffectMultiply, CONST_CS | CONST_PERSISTENT);
#endif

	REGISTER_LONG_CONSTANT("IMG_CROP_DEFAULT", GD_CROP_DEFAULT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_CROP_TRANSPARENT", GD_CROP_TRANSPARENT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_CROP_BLACK", GD_CROP_BLACK, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_CROP_WHITE", GD_CROP_WHITE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_CROP_SIDES", GD_CROP_SIDES, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_CROP_THRESHOLD", GD_CROP_THRESHOLD, CONST_CS | CONST_PERSISTENT);


	REGISTER_LONG_CONSTANT("IMG_BELL", GD_BELL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BESSEL", GD_BESSEL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BILINEAR_FIXED", GD_BILINEAR_FIXED, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BICUBIC", GD_BICUBIC, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BICUBIC_FIXED", GD_BICUBIC_FIXED, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BLACKMAN", GD_BLACKMAN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BOX", GD_BOX, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_BSPLINE", GD_BSPLINE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_CATMULLROM", GD_CATMULLROM, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_GAUSSIAN", GD_GAUSSIAN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_GENERALIZED_CUBIC", GD_GENERALIZED_CUBIC, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_HERMITE", GD_HERMITE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_HAMMING", GD_HAMMING, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_HANNING", GD_HANNING, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_MITCHELL", GD_MITCHELL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_POWER", GD_POWER, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_QUADRATIC", GD_QUADRATIC, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_SINC", GD_SINC, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_NEAREST_NEIGHBOUR", GD_NEAREST_NEIGHBOUR, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_WEIGHTED4", GD_WEIGHTED4, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_TRIANGLE", GD_TRIANGLE, CONST_CS | CONST_PERSISTENT);

	REGISTER_LONG_CONSTANT("IMG_AFFINE_TRANSLATE", GD_AFFINE_TRANSLATE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_AFFINE_SCALE", GD_AFFINE_SCALE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_AFFINE_ROTATE", GD_AFFINE_ROTATE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_AFFINE_SHEAR_HORIZONTAL", GD_AFFINE_SHEAR_HORIZONTAL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_AFFINE_SHEAR_VERTICAL", GD_AFFINE_SHEAR_VERTICAL, CONST_CS | CONST_PERSISTENT);

#ifdef HAVE_GD_BUNDLED
	REGISTER_LONG_CONSTANT("GD_BUNDLED", 1, CONST_CS | CONST_PERSISTENT);
#else
	REGISTER_LONG_CONSTANT("GD_BUNDLED", 0, CONST_CS | CONST_PERSISTENT);
#endif

	/* Section Filters */
	REGISTER_LONG_CONSTANT("IMG_FILTER_NEGATE", IMAGE_FILTER_NEGATE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_GRAYSCALE", IMAGE_FILTER_GRAYSCALE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_BRIGHTNESS", IMAGE_FILTER_BRIGHTNESS, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_CONTRAST", IMAGE_FILTER_CONTRAST, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_COLORIZE", IMAGE_FILTER_COLORIZE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_EDGEDETECT", IMAGE_FILTER_EDGEDETECT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_GAUSSIAN_BLUR", IMAGE_FILTER_GAUSSIAN_BLUR, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_SELECTIVE_BLUR", IMAGE_FILTER_SELECTIVE_BLUR, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_EMBOSS", IMAGE_FILTER_EMBOSS, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_MEAN_REMOVAL", IMAGE_FILTER_MEAN_REMOVAL, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_SMOOTH", IMAGE_FILTER_SMOOTH, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_PIXELATE", IMAGE_FILTER_PIXELATE, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("IMG_FILTER_SCATTER", IMAGE_FILTER_SCATTER, CONST_CS | CONST_PERSISTENT);
	/* End Section Filters */

#ifdef GD_VERSION_STRING
	REGISTER_STRING_CONSTANT("GD_VERSION", GD_VERSION_STRING, CONST_CS | CONST_PERSISTENT);
#endif

#if defined(GD_MAJOR_VERSION) && defined(GD_MINOR_VERSION) && defined(GD_RELEASE_VERSION) && defined(GD_EXTRA_VERSION)
	REGISTER_LONG_CONSTANT("GD_MAJOR_VERSION", GD_MAJOR_VERSION, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("GD_MINOR_VERSION", GD_MINOR_VERSION, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("GD_RELEASE_VERSION", GD_RELEASE_VERSION, CONST_CS | CONST_PERSISTENT);
	REGISTER_STRING_CONSTANT("GD_EXTRA_VERSION", GD_EXTRA_VERSION, CONST_CS | CONST_PERSISTENT);
#endif


#ifdef HAVE_GD_PNG

	/*
	 * cannot include #include "png.h"
	 * /usr/include/pngconf.h:310:2: error: #error png.h already includes setjmp.h with some additional fixup.
	 * as error, use the values for now...
	 */
	REGISTER_LONG_CONSTANT("PNG_NO_FILTER",	    0x00, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PNG_FILTER_NONE",   0x08, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PNG_FILTER_SUB",    0x10, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PNG_FILTER_UP",     0x20, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PNG_FILTER_AVG",    0x40, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PNG_FILTER_PAETH",  0x80, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("PNG_ALL_FILTERS",   0x08 | 0x10 | 0x20 | 0x40 | 0x80, CONST_CS | CONST_PERSISTENT);
#endif

	return SUCCESS;
}
/* }}} */

/* {{{ PHP_MSHUTDOWN_FUNCTION */
PHP_MSHUTDOWN_FUNCTION(gd)
{
#if defined(HAVE_GD_FREETYPE) && defined(HAVE_GD_BUNDLED)
	gdFontCacheMutexShutdown();
#endif
	UNREGISTER_INI_ENTRIES();
	return SUCCESS;
}
/* }}} */

/* {{{ PHP_RSHUTDOWN_FUNCTION */
PHP_RSHUTDOWN_FUNCTION(gd)
{
#ifdef HAVE_GD_FREETYPE
	gdFontCacheShutdown();
#endif
	return SUCCESS;
}
/* }}} */

#ifdef HAVE_GD_BUNDLED
#define PHP_GD_VERSION_STRING "bundled (2.1.0 compatible)"
#else
# define PHP_GD_VERSION_STRING GD_VERSION_STRING
#endif

/* {{{ PHP_MINFO_FUNCTION */
PHP_MINFO_FUNCTION(gd)
{
	php_info_print_table_start();
	php_info_print_table_row(2, "GD Support", "enabled");

	/* need to use a PHPAPI function here because it is external module in windows */

#ifdef HAVE_GD_BUNDLED
	php_info_print_table_row(2, "GD Version", PHP_GD_VERSION_STRING);
#else
	php_info_print_table_row(2, "GD headers Version", PHP_GD_VERSION_STRING);
#ifdef HAVE_GD_LIBVERSION
	php_info_print_table_row(2, "GD library Version", gdVersionString());
#endif
#endif

#ifdef HAVE_GD_FREETYPE
	php_info_print_table_row(2, "FreeType Support", "enabled");
	php_info_print_table_row(2, "FreeType Linkage", "with freetype");
#ifdef HAVE_GD_BUNDLED
	{
		char tmp[256];

#ifdef FREETYPE_PATCH
		snprintf(tmp, sizeof(tmp), "%d.%d.%d", FREETYPE_MAJOR, FREETYPE_MINOR, FREETYPE_PATCH);
#elif defined(FREETYPE_MAJOR)
		snprintf(tmp, sizeof(tmp), "%d.%d", FREETYPE_MAJOR, FREETYPE_MINOR);
#else
		snprintf(tmp, sizeof(tmp), "1.x");
#endif
		php_info_print_table_row(2, "FreeType Version", tmp);
	}
#endif
#endif

	php_info_print_table_row(2, "GIF Read Support", "enabled");
	php_info_print_table_row(2, "GIF Create Support", "enabled");

#ifdef HAVE_GD_JPG
	{
		php_info_print_table_row(2, "JPEG Support", "enabled");
#ifdef HAVE_GD_BUNDLED
		php_info_print_table_row(2, "libJPEG Version", gdJpegGetVersionString());
#endif
	}
#endif

#ifdef HAVE_GD_PNG
	php_info_print_table_row(2, "PNG Support", "enabled");
#ifdef HAVE_GD_BUNDLED
	php_info_print_table_row(2, "libPNG Version", gdPngGetVersionString());
#endif
#endif
	php_info_print_table_row(2, "WBMP Support", "enabled");
#ifdef HAVE_GD_XPM
	php_info_print_table_row(2, "XPM Support", "enabled");
#ifdef HAVE_GD_BUNDLED
	{
		char tmp[12];
		snprintf(tmp, sizeof(tmp), "%d", XpmLibraryVersion());
		php_info_print_table_row(2, "libXpm Version", tmp);
	}
#endif
#endif
	php_info_print_table_row(2, "XBM Support", "enabled");
#ifdef USE_GD_JISX0208
	php_info_print_table_row(2, "JIS-mapped Japanese Font Support", "enabled");
#endif
#ifdef HAVE_GD_WEBP
	php_info_print_table_row(2, "WebP Support", "enabled");
#endif
#ifdef HAVE_GD_BMP
	php_info_print_table_row(2, "BMP Support", "enabled");
#endif
#ifdef HAVE_GD_AVIF
	php_info_print_table_row(2, "AVIF Support", "enabled");
#endif
#ifdef HAVE_GD_TGA
	php_info_print_table_row(2, "TGA Read Support", "enabled");
#endif
	php_info_print_table_end();
	DISPLAY_INI_ENTRIES();
}
/* }}} */

/* {{{ */
PHP_FUNCTION(gd_info)
{
	if (zend_parse_parameters_none() == FAILURE) {
		RETURN_THROWS();
	}

	array_init(return_value);

	add_assoc_string(return_value, "GD Version", PHP_GD_VERSION_STRING);

#ifdef HAVE_GD_FREETYPE
	add_assoc_bool(return_value, "FreeType Support", 1);
	add_assoc_string(return_value, "FreeType Linkage", "with freetype");
#else
	add_assoc_bool(return_value, "FreeType Support", 0);
#endif
	add_assoc_bool(return_value, "GIF Read Support", 1);
	add_assoc_bool(return_value, "GIF Create Support", 1);
#ifdef HAVE_GD_JPG
	add_assoc_bool(return_value, "JPEG Support", 1);
#else
	add_assoc_bool(return_value, "JPEG Support", 0);
#endif
#ifdef HAVE_GD_PNG
	add_assoc_bool(return_value, "PNG Support", 1);
#else
	add_assoc_bool(return_value, "PNG Support", 0);
#endif
	add_assoc_bool(return_value, "WBMP Support", 1);
#ifdef HAVE_GD_XPM
	add_assoc_bool(return_value, "XPM Support", 1);
#else
	add_assoc_bool(return_value, "XPM Support", 0);
#endif
	add_assoc_bool(return_value, "XBM Support", 1);
#ifdef HAVE_GD_WEBP
	add_assoc_bool(return_value, "WebP Support", 1);
#else
	add_assoc_bool(return_value, "WebP Support", 0);
#endif
#ifdef HAVE_GD_BMP
	add_assoc_bool(return_value, "BMP Support", 1);
#else
	add_assoc_bool(return_value, "BMP Support", 0);
#endif
#ifdef HAVE_GD_AVIF
	add_assoc_bool(return_value, "AVIF Support", 1);
#else
	add_assoc_bool(return_value, "AVIF Support", 0);
#endif
#ifdef HAVE_GD_TGA
	add_assoc_bool(return_value, "TGA Read Support", 1);
#else
	add_assoc_bool(return_value, "TGA Read Support", 0);
#endif
#ifdef USE_GD_JISX0208
	add_assoc_bool(return_value, "JIS-mapped Japanese Font Support", 1);
#else
	add_assoc_bool(return_value, "JIS-mapped Japanese Font Support", 0);
#endif
}
/* }}} */

#define FLIPWORD(a) (((a & 0xff000000) >> 24) | ((a & 0x00ff0000) >> 8) | ((a & 0x0000ff00) << 8) | ((a & 0x000000ff) << 24))

/* {{{ Load a new font */
PHP_FUNCTION(imageloadfont)
{
	zend_string *file;
	int hdr_size = sizeof(gdFont) - sizeof(char *);
	int body_size, n = 0, b, i, body_size_check;
	gdFontPtr font;
	php_stream *stream;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "P", &file) == FAILURE) {
		RETURN_THROWS();
	}

	stream = php_stream_open_wrapper(ZSTR_VAL(file), "rb", IGNORE_PATH | REPORT_ERRORS, NULL);
	if (stream == NULL) {
		RETURN_FALSE;
	}

	/* Only supports a architecture-dependent binary dump format
	 * at the moment.
	 * The file format is like this on machines with 32-byte integers:
	 *
	 * byte 0-3:   (int) number of characters in the font
	 * byte 4-7:   (int) value of first character in the font (often 32, space)
	 * byte 8-11:  (int) pixel width of each character
	 * byte 12-15: (int) pixel height of each character
	 * bytes 16-:  (char) array with character data, one byte per pixel
	 *                    in each character, for a total of
	 *                    (nchars*width*height) bytes.
	 */
	font = (gdFontPtr) emalloc(sizeof(gdFont));
	b = 0;
	while (b < hdr_size && (n = php_stream_read(stream, (char*)&font[b], hdr_size - b)) > 0) {
		b += n;
	}

	if (n <= 0) {
		efree(font);
		if (php_stream_eof(stream)) {
			php_error_docref(NULL, E_WARNING, "End of file while reading header");
		} else {
			php_error_docref(NULL, E_WARNING, "Error while reading header");
		}
		php_stream_close(stream);
		RETURN_FALSE;
	}
	i = php_stream_tell(stream);
	php_stream_seek(stream, 0, SEEK_END);
	body_size_check = php_stream_tell(stream) - hdr_size;
	php_stream_seek(stream, i, SEEK_SET);

	if (overflow2(font->nchars, font->h) || overflow2(font->nchars * font->h, font->w )) {
		php_error_docref(NULL, E_WARNING, "Error reading font, invalid font header");
		efree(font);
		php_stream_close(stream);
		RETURN_FALSE;
	}

	body_size = font->w * font->h * font->nchars;
	if (body_size != body_size_check) {
		font->w = FLIPWORD(font->w);
		font->h = FLIPWORD(font->h);
		font->nchars = FLIPWORD(font->nchars);
		if (overflow2(font->nchars, font->h) || overflow2(font->nchars * font->h, font->w )) {
			php_error_docref(NULL, E_WARNING, "Error reading font, invalid font header");
			efree(font);
			php_stream_close(stream);
			RETURN_FALSE;
		}
		body_size = font->w * font->h * font->nchars;
	}

	if (body_size != body_size_check) {
		php_error_docref(NULL, E_WARNING, "Error reading font");
		efree(font);
		php_stream_close(stream);
		RETURN_FALSE;
	}

	ZEND_ASSERT(body_size > 0);
	font->data = emalloc(body_size);
	b = 0;
	while (b < body_size && (n = php_stream_read(stream, &font->data[b], body_size - b)) > 0) {
		b += n;
	}

	if (n <= 0) {
		efree(font->data);
		efree(font);
		if (php_stream_eof(stream)) {
			php_error_docref(NULL, E_WARNING, "End of file while reading body");
		} else {
			php_error_docref(NULL, E_WARNING, "Error while reading body");
		}
		php_stream_close(stream);
		RETURN_FALSE;
	}
	php_stream_close(stream);

	object_init_ex(return_value, gd_font_ce);
	php_gd_font_object_from_zend_object(Z_OBJ_P(return_value))->font = font;
}
/* }}} */

/* {{{ Set the line drawing styles for use with imageline and IMG_COLOR_STYLED. */
PHP_FUNCTION(imagesetstyle)
{
	zval *IM, *styles, *item;
	gdImagePtr im;
	int *stylearr;
	int index = 0;
	uint32_t num_styles;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Oa", &IM, gd_image_ce, &styles) == FAILURE)  {
		RETURN_THROWS();
	}

	im = php_gd_libgdimageptr_from_zval_p(IM);

	num_styles = zend_hash_num_elements(Z_ARRVAL_P(styles));
	if (num_styles == 0) {
		zend_argument_value_error(2, "cannot be empty");
		RETURN_THROWS();
	}

	/* copy the style values in the stylearr */
	stylearr = safe_emalloc(sizeof(int), num_styles, 0);

	ZEND_HASH_FOREACH_VAL(Z_ARRVAL_P(styles), item) {
		stylearr[index++] = zval_get_long(item);
	} ZEND_HASH_FOREACH_END();

	gdImageSetStyle(im, stylearr, index);

	efree(stylearr);

	RETURN_TRUE;
}
/* }}} */

/* {{{ Create a new true color image */
PHP_FUNCTION(imagecreatetruecolor)
{
	zend_long x_size, y_size;
	gdImagePtr im;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &x_size, &y_size) == FAILURE) {
		RETURN_THROWS();
	}

	if (x_size <= 0 || x_size >= INT_MAX) {
		zend_argument_value_error(1, "must be greater than 0");
		RETURN_THROWS();
	}

	if (y_size <= 0 || y_size >= INT_MAX) {
		zend_argument_value_error(2, "must be greater than 0");
		RETURN_THROWS();
	}

	im = gdImageCreateTrueColor(x_size, y_size);

	if (!im) {
		RETURN_FALSE;
	}

	php_gd_assign_libgdimageptr_as_extgdimage(return_value, im);
}
/* }}} */

/* {{{ return true if the image uses truecolor */
PHP_FUNCTION(imageistruecolor)
{
	zval *IM;
	gdImagePtr im;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O", &IM, gd_image_ce) == FAILURE) {
		RETURN_THROWS();
	}

	im = php_gd_libgdimageptr_from_zval_p(IM);

	RETURN_BOOL(im->trueColor);
}
/* }}} */

/* {{{ Convert a true color image to a palette based image with a number of colors, optionally using dithering. */
PHP_FUNCTION(imagetruecolortopalette)
{
	zval *IM;
	bool dither;
	zend_long ncolors;
	gdImagePtr im;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Obl", &IM, gd_image_ce, &dither, &ncolors) == FAILURE)  {
		RETURN_THROWS();
	}

	im = php_gd_libgdimageptr_from_zval_p(IM);

	if (ncolors <= 0 || ZEND_LONG_INT_OVFL(ncolors)) {
		zend_argument_value_error(3, "must be greater than 0 and less than %d", INT_MAX);
		RETURN_THROWS();
	}

	if (gdImageTrueColorToPalette(im, dither, (int)ncolors)) {
		RETURN_TRUE;
	} else {
		php_error_docref(NULL, E_WARNING, "Couldn't convert to palette");
		RETURN_FALSE;
	}
}
/* }}} */

/* {{{ Convert a palette based image to a true color image. */
PHP_FUNCTION(imagepalettetotruecolor)
{
	zval *IM;
	gdImagePtr im;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "O", &IM, gd_image_ce) == FAILURE)  {
		RETURN_THROWS();
	}

	im = php_gd_libgdimageptr_from_zval_p(IM);

	if (gdImagePaletteToTrueColor(im) == 0) {
		RETURN_FALSE;
	}

	RETURN_TRUE;
}
/* }}} */

/* {{{ Makes the colors of the palette version of an image more closely match the true color version */
PHP_FUNCTION(imagecolormatch)
{
	zval *IM1, *IM2;
	gdImagePtr im1, im2;
	int result;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "OO", &IM1, gd_image_ce, &IM2, gd_image_ce) == FAILURE) {
		RETURN_THROWS();
	}

	im1 = php_gd_libgdimageptr_from_zval_p(IM1);
	im2 = php_gd_libgdimageptr_from_zval_p(IM2);

	result = gdImageColorMatch(im1, im2);
	switch (result) {
		case -1:
			zend_argument_value_error(1, "must be TrueColor");
			RETURN_THROWS();
			break;
		case -2:
			zend_argument_value_error(2, "must be Palette");
			RETURN_THROWS();
			break;
		case -3:
			zend_argument_value_error(2, "must be the same size as argument #1 ($im1)");
			RETURN_THROWS();
			break;
		case -4:
			zend_argument_value_error(2, "must have at least one color");
			RETURN_THROWS();
			break;
	}

	RETURN_TRUE;
}
/* }}} */

/* {{{ Set line thickness for drawing lines, ellipses, rectangles, polygons etc. */
PHP_FUNCTION(imagesetthickness)
{
	zval *IM;
	zend_long thick;
	gdImagePtr im;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Ol", &IM, gd_image_ce, &thick) == FAILURE) {
		RETURN_THROWS();
	}

	im = php_gd_libgdimageptr_from_zval_p(IM);

	gdImageSetThickness(im, thick);

	RETURN_TRUE;
}
/* }}} */

/* {{{ Draw an ellipse */
PHP_FUNCTION(imagefilledellipse)
{
	zval *IM;
	zend_long cx, cy, w, h, color;
	gdImagePtr im;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Olllll", &IM, gd_image_ce, &cx, &cy, &w, &h, &color) == FAILURE) {
		RETURN_THROWS();
	}

	im = php_gd_libgdimageptr_from_zval_p(IM);

	gdImageFilledEllipse(im, cx, cy, w, h, color);
	RETURN_TRUE;
}
/* }}} */

/* {{{ Draw a filled partial ellipse */
PHP_FUNCTION(imagefilledarc)
{
	zval *IM;
	zend_long cx, cy, w, h, ST, E, col, style;
	gdImagePtr im;
	int e, st;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "Ollllllll", &IM, gd_image_ce, &cx, &cy, &w, &h, &ST, &E, &col, &style) == FAILURE) {