blame: source/code/CppSdlImageHolder.cpp

/*

===========================================================================

blockattack - Block Attack - Rise of the Blocks

Copyright (C) 2005-2013 Poul Sander

This program 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 2 of the License, or

(at your option) any later version.

This program 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 this program.  If not, see http://www.gnu.org/licenses/

Source information and contacts persons can be found at

http://blockattack.sf.net

===========================================================================

*/

#include "CppSdlImageHolder.hpp"

#include "SDL_image.h"

#include <stdexcept>

namespace CppSdl {

CppSdlImageHolder::CppSdlImageHolder() {

	data = nullptr;

}

CppSdlImageHolder::CppSdlImageHolder(std::string filename) {

	data = IMG_Load(filename.c_str());

	if (!data) {

		//Here we should throw an exception

		throw std::runtime_error(std::string("Could not read file \""+filename+"\""));

	}

	SDL_GetClipRect(data,&area);

	OptimizeForBlit();

}

CppSdlImageHolder::CppSdlImageHolder(char* rawdata, int datasize) {

	SDL_RWops* rw = SDL_RWFromMem (rawdata, datasize);

	//The above might fail and return null.

	if (!rw) {

		throw std::runtime_error(std::string("Could not read raw data"));

	}

	data = IMG_Load_RW(rw,true); //the second argument tells the function to free RWops

	if (!data) {

		throw std::runtime_error("Could not convert raw data to image");

	}

	SDL_GetClipRect(data,&area);

	OptimizeForBlit();

}

CppSdlImageHolder::~CppSdlImageHolder() {

	MakeNull();

}

SDL_Surface* CppSdlImageHolder::GetRawDataInsecure() {

	Initialized();

	return data;

}

Uint32 CppSdlImageHolder::GetWidth() {

	if (IsNull()) {

		return 0;

	}

	return area.w;

}

Uint32 CppSdlImageHolder::GetHeight() {

	if (IsNull()) {

		return 0;

	}

	return area.h;

}

void CppSdlImageHolder::PaintTo(SDL_Surface* target, int x, int y) {

	static SDL_Rect dest; //static for reuse

	if (IsNull()) {

		return;

	}

	dest.x = x;

	dest.y = y;

	SDL_BlitSurface(data,&area, target,&dest);

}

void CppSdlImageHolder::OptimizeForBlit(bool allowAlpha) {

	static SDL_Surface* tmp;

	Initialized();

	if (allowAlpha) {

		tmp = SDL_DisplayFormatAlpha(data);

	}

	else {

		tmp = SDL_DisplayFormat(data);

	}

	SDL_FreeSurface(data);

	data = tmp;

}

void CppSdlImageHolder::Initialized() {

	if (data == nullptr) {

		throw std::runtime_error("ImageHolder used uninitialized!");

	}

}

bool CppSdlImageHolder::IsNull() {

	if (data == nullptr ) {

		return true;

	}

	return false;

}

void CppSdlImageHolder::MakeNull() {

	if (IsNull()) {

		return;

	}

	SDL_FreeSurface(data);

	data = nullptr;

}

}