openspades/Sources/Draw/SWImage.cpp

/*
 Copyright (c) 2013 yvt
 
 This file is part of OpenSpades.
 
 OpenSpades is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
 OpenSpades is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with OpenSpades.  If not, see <http://www.gnu.org/licenses/>.
 
 */

#include "SWImage.h"
#include <Core/FileManager.h>
#include <Core/IStream.h>

namespace spades {
	namespace draw {
		SWImage::SWImage(Bitmap *m):
		w(static_cast<float>(m->GetWidth())),
		h(static_cast<float>(m->GetHeight())),
		iw(1.f / w), ih(1.f / h),
		ew(m->GetWidth()),
		eh(m->GetHeight()),
		isWhite(false)
		{
			bmp.resize(ew * eh);
			
			// premultiplied alpha
			{
				uint32_t *inpix = m->GetPixels();
				uint32_t *outpix = bmp.data();
				bool foundNonWhite = false;
				for(std::size_t i = ew * eh; i; i--) {
					uint32_t col = *(inpix++);
					unsigned int alpha = static_cast<unsigned int>(col >> 24);
					alpha += (alpha >> 7); // [0,255] to [0,256]
					
					unsigned int r = static_cast<unsigned int>((col >> 0) & 0xff);
					unsigned int g = static_cast<unsigned int>((col >> 8) & 0xff);
					unsigned int b = static_cast<unsigned int>((col >>16) & 0xff);
					r = (r * alpha) >> 8;
					g = (g * alpha) >> 8;
					b = (b * alpha) >> 8;
					
					col &= 0xff000000;
					col |= b | (g << 8) | (r << 16); // swap RGB/BGR
					*(outpix++) = col;
					
					if(col != 0xffffffff)
						foundNonWhite = true;
				}
				isWhite = !foundNonWhite;
			}
		}
		
		SWImage::SWImage(int w, int h):
		ew(w), eh(h),
		w(static_cast<float>(ew)),
		h(static_cast<float>(eh)),
		iw(1.f / w),
		ih(1.f / h),
		isWhite(false){
			bmp.reserve(ew * eh);
		}
		
		SWImage::~SWImage() {
		}
		
		SWImageManager::~SWImageManager() {
			for(auto it = images.begin(); it != images.end(); it++)
				it->second->Release();
		}
		
		SWImage *SWImageManager::RegisterImage(const std::string &name) {
			auto it = images.find(name);
			if(it == images.end()) {
				Handle<Bitmap> vm;
				vm.Set(Bitmap::Load(name), false);
				auto *m = CreateImage(vm);
				images.insert(std::make_pair(name, m));
				m->AddRef();
				return m;
			}else{
				auto *image = it->second;
				image->AddRef();
				return image;
			}
		}
		
		SWImage *SWImageManager::CreateImage(Bitmap *vm) {
			return new SWImage(vm);
		}
	}
}