147 lines
4.1 KiB
C++
147 lines
4.1 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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// This file is modified by riso from CImageLoaderJPG.h
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// nanosvg as parser and rasterizer for SVG files.
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// The nanosvg headers are based on those in SDL2_image-2.0.5
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#include "CImageLoaderSVG.h"
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#include "IReadFile.h"
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#include "CImage.h"
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#include "os.h"
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#include "irrString.h"
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#include "CNullDriver.h"
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#include "ge_main.hpp"
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namespace irr
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{
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namespace video
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{
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//! constructor
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CImageLoaderSVG::CImageLoaderSVG()
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{
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}
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//! returns true if the file maybe is able to be loaded by this class
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//! based on the file extension (e.g. ".tga")
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bool CImageLoaderSVG::isALoadableFileExtension(const io::path& filename) const
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{
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return core::hasFileExtension ( filename, "svg" );
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}
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//! returns true if the file maybe is able to be loaded by this class
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bool CImageLoaderSVG::isALoadableFileFormat(io::IReadFile* file) const
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{
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// read first 4095 characters, check if can find "<svg"
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// this implementation refers IMG_isSVG() in SDL2_Image
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long filesize = file->getSize();
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long cropsize = filesize < 4095L ? filesize : 4095L;
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char* data = new char[cropsize+1];
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int readsize = file->read(data,cropsize);
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data[cropsize] = '\0';
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if( (long)readsize != cropsize) {
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os::Printer::log("Couldn't read SVG image file", file->getFileName(), ELL_ERROR);
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delete[] data;
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return 0;
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}
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// check if can find "<svg" in the file
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if ( strstr(data, "<svg") )
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{
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delete[] data;
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return 1;
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}
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delete[] data;
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return 0;
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}
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//! creates a surface from the file
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IImage* CImageLoaderSVG::loadImage(io::IReadFile* file, bool skip_checking) const
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{
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// check IMG_LoadSVG_RW
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struct NSVGimage *img = 0;
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struct NSVGrasterizer *rasterizer = 0;
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video::IImage* image = 0;
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int w, h;
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// read all the characters in the svg file to data
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long filesize = file->getSize();
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char* data = new char[filesize+1];
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int readsize = file->read(data,filesize);
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data[filesize] = '\0';
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if( (long)readsize != filesize) {
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os::Printer::log("Couldn't read SVG image file", file->getFileName(), ELL_ERROR);
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delete[] data;
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return 0;
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}
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// parse the svg image
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img = nsvgParse(data, "px", 96);
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if ( !img ) {
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os::Printer::log("Couldn't parse SVG image", ELL_ERROR);
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delete[] data;
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return 0;
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}
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delete[] data;
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rasterizer = nsvgCreateRasterizer();
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if ( !rasterizer ) {
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os::Printer::log("Couldn't create SVG rasterizer", ELL_ERROR);
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nsvgDelete( img );
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return 0;
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}
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float scale =1.0f;
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// only rescale the icons
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if ( strstr(file->getFileName().c_str(),"gui/icons/") )
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{
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// determine scaling based on screen size
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float screen_height = (float)GE::getDriver()->getCurrentRenderTargetSize().Height;
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float desired_icon_size = 0.21*screen_height + 30.0f; // phenomenological
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scale = desired_icon_size/img->height;
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}
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// create surface
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w = (int)(img->width*scale);
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h = (int)(img->height*scale);
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image = new CImage(ECF_A8R8G8B8, core::dimension2d<u32>(w, h));
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if ( !image ) {
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os::Printer::log("LOAD SVG: create image struct failure", file->getFileName(), ELL_ERROR);
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nsvgDeleteRasterizer( rasterizer );
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nsvgDelete( img );
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return 0;
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}
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// rasterization
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nsvgRasterize(rasterizer, img, 0.0f, 0.0f, scale, (unsigned char *)image->lock(), (int)image->getDimension().Width, (int)image->getDimension().Height, (int)image->getPitch());
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if (image)
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image->unlock();
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// clean up
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nsvgDeleteRasterizer( rasterizer );
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nsvgDelete( img );
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return image;
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}
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//! creates a loader which is able to load svg images
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IImageLoader* createImageLoaderSVG()
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{
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return new CImageLoaderSVG();
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}
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} // end namespace video
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} // end namespace irr
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