158 lines
3.9 KiB
C++
158 lines
3.9 KiB
C++
// ==============================================================
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// This file is part of Glest Shared Library (www.glest.org)
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//
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// Copyright (C) 2001-2010 Martiño Figueroa and others
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//
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// You can redistribute this code and/or modify it under
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// the terms of the GNU General Public License as published
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// by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version
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// ==============================================================
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#include "TGAReader.h"
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#include "types.h"
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#include "pixmap.h"
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#include <stdexcept>
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#include <iostream>
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#include "leak_dumper.h"
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using std::runtime_error;
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namespace Shared{ namespace Graphics{
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#pragma pack(push, 1)
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/**Copied from pixmap.cpp*/
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// =====================================================
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// Information for reading the targa-file
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// =====================================================
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struct TargaFileHeader{
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int8 idLength;
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int8 colourMapType;
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int8 dataTypeCode;
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int16 colourMapOrigin;
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int16 colourMapLength;
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int8 colourMapDepth;
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int16 xOrigin;
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int16 yOrigin;
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int16 width;
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int16 height;
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int8 bitsPerPixel;
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int8 imageDescriptor;
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};
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#pragma pack(pop)
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static const int tgaUncompressedRgb= 2;
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static const int tgaUncompressedBw= 3;
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// =====================================================
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// class TGAReader
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// =====================================================
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/**Get Extension array, initialised*/
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//static inline const string* getExtensionStrings() {
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static inline std::vector<string> getExtensionStrings() {
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//static const string extensions[] = {"tga", ""};
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static std::vector<string> extensions;
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if(extensions.size() == 0) {
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extensions.push_back("tga");
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}
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return extensions;
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}
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TGAReader::TGAReader(): FileReader<Pixmap2D>(getExtensionStrings()) {}
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Pixmap2D* TGAReader::read(ifstream& in, const string& path, Pixmap2D* ret) const {
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//read header
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TargaFileHeader fileHeader;
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in.read((char*)&fileHeader, sizeof(TargaFileHeader));
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if (!in.good()) {
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throw runtime_error(path + " could not be read");
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}
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//check that we can load this tga file
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if(fileHeader.idLength!=0){
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throw runtime_error(path + ": id field is not 0");
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}
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if(fileHeader.dataTypeCode!=tgaUncompressedRgb && fileHeader.dataTypeCode!=tgaUncompressedBw){
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throw runtime_error(path + ": only uncompressed BW and RGB targa images are supported");
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}
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//check bits per pixel
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if(fileHeader.bitsPerPixel!=8 && fileHeader.bitsPerPixel!=24 && fileHeader.bitsPerPixel!=32){
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throw runtime_error(path + ": only 8, 24 and 32 bit targa images are supported");
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}
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const int h = fileHeader.height;
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const int w = fileHeader.width;
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const int fileComponents= fileHeader.bitsPerPixel/8;
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const int picComponents = (ret->getComponents()==-1)?fileComponents:ret->getComponents();
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//std::cout << "TGA-Components: Pic: " << picComponents << " old: " << (ret->getComponents()) << " File: " << fileComponents << std::endl;
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ret->init(w,h,picComponents);
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uint8* pixels = ret->getPixels();
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//read file
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for(int i=0; i<h*w*picComponents; i+=picComponents){
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uint8 r, g, b, a, l;
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if(fileComponents==1){
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in.read((char*)&l,1);
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r= l;
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g= l;
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b= l;
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a= 255;
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}
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else{
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in.read((char*)&b, 1);
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in.read((char*)&g, 1);
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in.read((char*)&r, 1);
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if(fileComponents==4){
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in.read((char*)&a, 1);
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} else {
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a= 255;
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}
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l= (r+g+b)/3;
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}
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if (!in.good()) {
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return NULL;
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}
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switch(picComponents){
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case 1:
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pixels[i]= l;
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break;
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case 3:
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pixels[i]= r;
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pixels[i+1]= g;
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pixels[i+2]= b;
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break;
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case 4:
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pixels[i]= r;
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pixels[i+1]= g;
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pixels[i+2]= b;
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pixels[i+3]= a;
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break;
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}
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}
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/*for(int i = 0; i < w*h*picComponents; ++i) {
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if (i%39 == 0) std::cout << std::endl;
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int first = pixels[i]/16;
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if (first < 10)
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std:: cout << first;
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else
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std::cout << (char)('A'+(first-10));
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first = pixels[i]%16;
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if (first < 10)
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std:: cout << first;
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else
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std::cout << (char)('A'+(first-10));
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std::cout << " ";
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}*/
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return ret;
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}
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}} //end namespace
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