IMG_svg.c
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/*
SDL_image: An example image loading library for use with SDL
Copyright (C) 1997-2017 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 */
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#define strtoll SDL_strtoll
#define sscanf SDL_sscanf
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#ifndef FLT_MAX
#define FLT_MAX 3.402823466e+38F
#endif
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#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;
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float scale = 1.0f;
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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 */