NS/main/source/ui/loadpng.cpp

/////////////////////////////////////////////////////////////////////////////////////////////////////
//////	2021 - Unused library removal. Uncomment and reinclude libpng and zlib to add back.		////
////////////////////////////////////////////////////////////////////////////////////////////////////
//#include <png.h>
//#include "loadpng.h"
//#include "cl_dll/wrect.h"
//#include "cl_dll/cl_dll.h"
//#include "MemoryInputStream.h"
//
//
//
////alternate read function for libpng
//void png_read_vgui_stream(png_structp png_ptr, png_bytep data, png_size_t length);
//
////conversion util to change from libpng format to raw bitmap
//void convertToUChar(png_infop png_info, png_bytepp rows, uchar* data);
//
//BitmapPNG* LoadPNG(char const *pFilename)
//{
//	int length;
//	uchar* data = gEngfuncs.COM_LoadFile((char*)pFilename, 5, &length);
//	if( !data ) { return NULL; }
//
//	MemoryInputStream stream(data,length);
//	
//	BitmapPNG* pRet = LoadPNG(stream);
//
//	gEngfuncs.COM_FreeFile(data);
//	
//	return pRet;		
//}
//
//BitmapPNG* LoadPNG(uchar* data, int length)
//{
//	if( !data ) { return NULL; }
//	MemoryInputStream stream(data,length);
//	return LoadPNG(stream);
//}
//
//BitmapPNG* LoadPNG(vgui::InputStream& stream)
//{
//	//allocate structures for read
//    png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
//    if (!png_ptr)
//        return NULL;
//
//    png_infop info_ptr = png_create_info_struct(png_ptr);
//    if (!info_ptr)
//    {
//        png_destroy_read_struct(&png_ptr,
//           (png_infopp)NULL, (png_infopp)NULL);
//        return NULL;
//    }
//
//	//set up our alternate read function
//	png_set_read_fn(png_ptr,&stream,png_read_vgui_stream);
//
//	//read the image
//	png_read_png(png_ptr,info_ptr,PNG_TRANSFORM_PACKING | PNG_TRANSFORM_STRIP_16,NULL);
//	png_bytepp rows = png_get_rows(png_ptr, info_ptr);
//	png_read_image(png_ptr,rows);
//
//	//we now have the information in row format, it needs to be converted to a single array
//	//of 32bit pixel values specified as a uchar* so that we can create the image object
//	uchar* data = new uchar[info_ptr->width*info_ptr->height*4];
//	convertToUChar(info_ptr,rows,data);
//
//	//create the BitmpPNG that we are going to return
//	BitmapPNG* returnVal = new BitmapPNG(info_ptr->width,info_ptr->height,data);
//
//	//read the information after the image for completeness
//	png_read_end(png_ptr,NULL);
//
//	//free up png structures and other memory we've used
//	delete[] data;
//	png_destroy_read_struct(&png_ptr,&info_ptr,(png_infopp)NULL);
//
//	return returnVal;
//}
//
////implementation of alternate read function
//void png_read_vgui_stream(png_structp png_ptr, png_bytep data, png_size_t length)
//{
//	vgui::InputStream* stream = static_cast<vgui::InputStream*>(png_get_io_ptr(png_ptr));
//	bool success = true;
//	stream->readUChar(data,(int)length,success);
//}
//
////implementation of conversion function
//void convertToUChar(png_infop png_info, png_bytepp rows, uchar* data)
//{
//	int offset = 0;
//	int offset_amnt = png_info->width*4;
//	for(size_t counter = 0; counter < png_info->height; ++counter)
//	{
//		memcpy(&data[offset],rows[counter],offset_amnt);
//		offset += offset_amnt;
//	}
//}