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116 lines
3.1 KiB
C++
116 lines
3.1 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 "BMPReader.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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using std::runtime_error;
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namespace Shared{ namespace Graphics{
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/**Copied from pixmap.cpp*/
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// =====================================================
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// Structs used for BMP-reading
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// =====================================================
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#pragma pack(push, 1)
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struct BitmapFileHeader{
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uint8 type1;
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uint8 type2;
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uint32 size;
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uint16 reserved1;
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uint16 reserved2;
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uint32 offsetBits;
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};
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struct BitmapInfoHeader{
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uint32 size;
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int32 width;
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int32 height;
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uint16 planes;
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uint16 bitCount;
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uint32 compression;
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uint32 sizeImage;
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int32 xPelsPerMeter;
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int32 yPelsPerMeter;
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uint32 clrUsed;
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uint32 clrImportant;
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};
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#pragma pack(pop)
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/**Returns a string containing the extensions we want, intitialisation is guaranteed*/
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static inline const string* getExtensionsBmp() {
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static const string extensions[] = {"bmp", ""};
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return extensions;
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}
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// =====================================================
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// class BMPReader
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// =====================================================
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BMPReader::BMPReader(): FileReader<Pixmap2D>(getExtensionsBmp()) {}
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/**Reads a Pixmap2D-object
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*This function reads a Pixmap2D-object from the given ifstream utilising the already existing Pixmap2D* ret.
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*Path is used for printing error messages
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*@return <code>NULL</code> if the Pixmap2D could not be read, else the pixmap*/
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Pixmap2D* BMPReader::read(ifstream& in, const string& path, Pixmap2D* ret) const {
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//read file header
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BitmapFileHeader fileHeader;
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in.read((char*)&fileHeader, sizeof(BitmapFileHeader));
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if(fileHeader.type1!='B' || fileHeader.type2!='M'){
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throw runtime_error(path +" is not a bitmap");
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}
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//read info header
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BitmapInfoHeader infoHeader;
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in.read((char*)&infoHeader, sizeof(BitmapInfoHeader));
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if(infoHeader.bitCount!=24){
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throw runtime_error(path+" is not a 24 bit bitmap");
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}
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int h= infoHeader.height;
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int w= infoHeader.width;
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int components= (ret->getComponents() == -1)?3:ret->getComponents();
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//std::cout << "BMP-Components: Pic: " << components << " old: " << (ret->getComponents()) << " File: " << 3 << std::endl;
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ret->init(w,h,components);
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uint8* pixels = ret->getPixels();
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for(int i=0; i<h*w*components; i+=components){
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uint8 r, g, b;
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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 (!in.good()) {
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return NULL;
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}
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switch(components){
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case 1:
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pixels[i]= (r+g+b)/3;
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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]= 255;
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break;
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}
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}
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return ret;
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}
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}} //end namespace
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