/*

SDL_image: An example image loading library for use with SDL

Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

/* This is an SVG image file loading framework, based on Nano SVG:

* https://github.com/memononen/nanosvg

*/

#include "SDL_image.h"

#ifdef LOAD_SVG

/* Replace C runtime functions with SDL C runtime functions for building on Windows */

#define acosf SDL_acosf

#define atan2f SDL_atan2f

#define cosf SDL_cosf

#define ceilf SDL_ceilf

#define fabs SDL_fabs

#define fabsf SDL_fabsf

#define floorf SDL_floorf

#define fmodf SDL_fmodf

#define free SDL_free

#define malloc SDL_malloc

#undef memcpy

#define memcpy SDL_memcpy

#undef memset

#define memset SDL_memset

#define pow SDL_pow

#define qsort SDL_qsort

#define realloc SDL_realloc

#define sinf SDL_sinf

#define sqrt SDL_sqrt

#define sqrtf SDL_sqrtf

#define sscanf SDL_sscanf

#undef strchr

#define strchr SDL_strchr

#undef strcmp

#define strcmp SDL_strcmp

#undef strncmp

#define strncmp SDL_strncmp

#undef strncpy

#define strncpy SDL_strlcpy

#define strlen SDL_strlen

#define strstr SDL_strstr

#define strtol SDL_strtol

#define strtoll SDL_strtoll

#define tanf SDL_tanf

#ifndef FLT_MAX

#define FLT_MAX 3.402823466e+38F

#endif

#undef HAVE_STDIO_H

#define NSVG_EXPORT static

#define NANOSVG_IMPLEMENTATION

#include "nanosvg.h"

#define NANOSVGRAST_IMPLEMENTATION

#include "nanosvgrast.h"

/* See if an image is contained in a data source */

int IMG_isSVG(SDL_RWops *src)

{

Sint64 start;

int is_SVG;

char magic[4096];

size_t magic_len;

if ( !src )

return 0;

start = SDL_RWtell(src);

is_SVG = 0;

magic_len = SDL_RWread(src, magic, 1, sizeof(magic) - 1);

magic[magic_len] = '\0';

if ( SDL_strstr(magic, "<svg") ) {

is_SVG = 1;

}

SDL_RWseek(src, start, RW_SEEK_SET);

return(is_SVG);

}

/* Load a SVG type image from an SDL datasource */

SDL_Surface *IMG_LoadSVG_RW(SDL_RWops *src)

{

char *data;

struct NSVGimage *image;

struct NSVGrasterizer *rasterizer;

SDL_Surface *surface = NULL;

float scale = 1.0f;

data = (char *)SDL_LoadFile_RW(src, NULL, SDL_FALSE);

if ( !data ) {

return NULL;

}

/* For now just use default units of pixels at 96 DPI */

image = nsvgParse(data, "px", 96.0f);

SDL_free(data);

if ( !image ) {

IMG_SetError("Couldn't parse SVG image");

return NULL;

}

rasterizer = nsvgCreateRasterizer();

if ( !rasterizer ) {

IMG_SetError("Couldn't create SVG rasterizer");

nsvgDelete( image );

return NULL;

}

surface = SDL_CreateRGBSurface(SDL_SWSURFACE,

(int)(image->width * scale),

(int)(image->height * scale),

32,

0x000000FF,

0x0000FF00,

0x00FF0000,

0xFF000000);

if ( !surface ) {

nsvgDeleteRasterizer( rasterizer );

nsvgDelete( image );

return NULL;

}

nsvgRasterize(rasterizer, image, 0.0f, 0.0f, scale, (unsigned char *)surface->pixels, surface->w, surface->h, surface->pitch);

nsvgDeleteRasterizer( rasterizer );

nsvgDelete( image );

return surface;

}

#else

/* See if an image is contained in a data source */

int IMG_isSVG(SDL_RWops *src)

{

return(0);

}

/* Load a SVG type image from an SDL datasource */

SDL_Surface *IMG_LoadSVG_RW(SDL_RWops *src)

{

return(NULL);

}

#endif /* LOAD_SVG */