Loading a bmp...(sweet snippets)

TheNerd Tk421 · 2003-08-11T01:28:09

#include "Bitmap.h" Bitmap::Bitmap(){ reset(); } Bitmap::Bitmap(char *file){ reset(); loadBMP(file); } Bitmap::~Bitmap(){ if(colours!=0) { delete[] colours; } if(data!=0) { delete[] data; } } bool Bitmap::loadBMP(char *file) { FILE *in; char *tempData; int numColours; loaded=false; if(colours!=0) { delete[] colours; } if(data!=0) { delete[] data; } in=fopen(file,"rb"); if(in==NULL) { error="File not found"; fclose(in); return false; } fread(&bmfh,sizeof(BitmapFileHeader),1,in); cout << "sizeof(BitmapFileHeader)=" << sizeof(BitmapFileHeader) << endl; if(bmfh.bfType!=BITMAP_MAGIC_NUMBER) { error="File is not in DIB format"; fclose(in); return false; } fread(&bmih,sizeof(BitmapInfoHeader),1,in); cout << "sizeof(BitmapInfoHeader)=" << sizeof(BitmapInfoHeader) << endl; width=bmih.biWidth; height=bmih.biHeight; bpp=bmih.biBitCount; cout << "biBitCount =" << bmih.biBitCount << endl; cout << "biClrImportant =" << bmih.biClrImportant << endl; cout << "biClrUsed =" << bmih.biClrUsed << endl; cout << "biCompression =" << bmih.biCompression << endl; cout << "biHeight =" << bmih.biHeight << endl; cout << "biPlanes =" << bmih.biPlanes << endl; cout << "biSize =" << bmih.biSize << endl; cout << "biSizeImage =" << bmih.biSizeImage << endl; cout << "biWidth =" << bmih.biWidth << endl; cout << "biXPelsPerMeter =" << bmih.biXPelsPerMeter << endl; cout << "biYPelsPerMeter =" << bmih.biYPelsPerMeter << endl; dataSize=(width*height*(unsigned int)(bmih.biBitCount/8.0)); numColours=1<<bmih.biBitCount; if(bpp<8) { error="File is not 8 or 24 bits per pixel"; fclose(in); return false; } if(bpp==8) { colours=new RGBQuad[numColours]; fread(colours,sizeof(RGBQuad),numColours,in); } tempData=new char[dataSize]; if(tempData==NULL) { error="Not enough memory to allocate a temporary buffer"; fclose(in); return false; } fread(tempData,sizeof(char),dataSize,in); fclose(in); byteWidth=padWidth=(int)((float)width*(float)bpp/8.0); while(padWidth%4!=0) { padWidth++; } if(bpp==8) { loaded=convert8(tempData); } else if(bpp==24) { loaded=convert24(tempData); } delete[] tempData; error="Bitmap loaded"; return loaded; } void Bitmap::reset(void) { loaded=false; colours=0; data=0; error=""; } bool Bitmap::convert24(char* tempData) { int offset,diff; diff=width*height*RGB_BYTE_SIZE; data=new char[diff]; if(data==NULL) { error="Not enough memory to allocate an image buffer"; delete[] data; return false; } if(height>0) { offset=padWidth-byteWidth; for(int i=0;i<dataSize;i+=3) { if((i+1)%padWidth==0) { i+=offset; } *(data+i+2)=*(tempData+i); *(data+i+1)=*(tempData+i+1); *(data+i)=*(tempData+i+2); } } else { offset=padWidth-byteWidth; int j=dataSize-3; for(int i=0;i<dataSize;i+=3) { if((i+1)%padWidth==0) { i+=offset; } *(data+j+2)=*(tempData+i); *(data+j+1)=*(tempData+i+1); *(data+j)=*(tempData+i+2); j-=3; } } return true; } bool Bitmap::convert8(char* tempData) { int offset,diff; diff=width*height*RGB_BYTE_SIZE; data=new char[diff]; if(data==NULL) { error="Not enough memory to allocate an image buffer"; delete[] data; return false; } if(height>0) { offset=padWidth-byteWidth; int j=0; for(int i=0;i<dataSize*RGB_BYTE_SIZE;i+=3) { if((i+1)%padWidth==0) { i+=offset; } *(data+i)=colours[*(tempData+j)].rgbRed; *(data+i+1)=colours[*(tempData+j)].rgbGreen; *(data+i+2)=colours[*(tempData+j)].rgbBlue; j++; } } else { offset=padWidth-byteWidth; int j=dataSize-1; for(int i=0;i<dataSize*RGB_BYTE_SIZE;i+=3) { if((i+1)%padWidth==0) { i+=offset; } *(data+i)=colours[*(tempData+j)].rgbRed; *(data+i+1)=colours[*(tempData+j)].rgbGreen; *(data+i+2)=colours[*(tempData+j)].rgbBlue; j--; } } return true; } errors: [Linker error] undefined reference to `WinMain@16' ..................... my header file: #ifndef _BITMAP_H #define _BITMAP_H #include <iostream> #include <cstdio> #include <string> using namespace std; const short BITMAP_MAGIC_NUMBER=19778; const int RGB_BYTE_SIZE=3; #pragma pack(push,bitmap_data,1) typedef struct tagRGBQuad { char rgbBlue; char rgbGreen; char rgbRed; char rgbReserved; } RGBQuad; typedef struct tagBitmapFileHeader { unsigned short bfType; unsigned int bfSize; unsigned short bfReserved1; unsigned short bfReserved2; unsigned int bfOffBits; } BitmapFileHeader; typedef struct tagBitmapInfoHeader { unsigned int biSize; int biWidth; int biHeight; unsigned short biPlanes; unsigned short biBitCount; unsigned int biCompression; unsigned int biSizeImage; int biXPelsPerMeter; int biYPelsPerMeter; unsigned int biClrUsed; unsigned int biClrImportant; } BitmapInfoHeader; #pragma pack(pop,bitmap_data) class Bitmap { public: RGBQuad *colours; char *data; bool loaded; int width,height; unsigned short bpp; string error; Bitmap(void); Bitmap(char *); ~Bitmap(); bool loadBMP(char *); private: BitmapFileHeader bmfh; BitmapInfoHeader bmih; int byteWidth; int padWidth; unsigned int dataSize; void reset(void); bool convert24(char *); bool convert8(char *); }; #endif _BITMAP_H [edited by - TheNerd Tk421 on August 10, 2003 11:27:03 PM]

For Beginners

Started by TheNerd Tk421 August 10, 2003 10:26 PM

13 comments, last by TheNerd Tk421 20 years, 8 months ago

guppy

330

August 11, 2003 01:12 AM

quote:Original post by TheNerd Tk421
I hate Dev-C++!!!!... nothing works with it.. i downloaded allegro..i have to have other compilers to compile it.. i downloaded OpenXDK.. i have to have VC++ or .net...Dev-C++ makes me mad

??? you choose the wrong project type and its the the IDE's fault? hate to break this to you but VisualStudio isn't some magic wand that will give a brain....

ps. FYI:

Console Application -> int main(int argc, char *argv[])
Windows Application -> int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)

/Please excuse my bad spelling - My native language is binary not english
|Visit me
\Take my advice - I don''t use it...

[edited by - guppy on August 11, 2003 2:14:33 AM]

/Please excuse my bad spelling - My native language is binary not english|Visit meTake my advice - I don''t use it...

FtMonkey

122

August 11, 2003 01:14 AM

Dev-C++ is sort of buggy but is not bad considering is free besides the reason why still has some bugs is because is not fully finished, but that doesn't mean you can't use it to make a good game in it...

[edited by - FtMonkey on August 11, 2003 2:20:12 AM]

The monkeys are listening...

TheNerd Tk421

122

Author

August 11, 2003 01:18 AM

I think its better than DJPP or BORLAND .. though i do eventually want to get sumtin like VC++ or .NET
..................
OpenXDK = open Xbox Dev Kit

[edited by - TheNerd Tk421 on August 11, 2003 2:18:59 AM]

PhilVaz

144

August 11, 2003 01:19 AM

Whether he sticks with Dev C, or buys Visual Studio .NET, he can start with this series....

I've printed all these out, they're great for beginners

Game Programming Genesis Part 1

Part 3 on Win GDI

Phil P

[edited by - PhilVaz on August 11, 2003 2:24:08 AM]

FtMonkey

122

August 11, 2003 01:28 AM

Well you say you want to get a better IDE but personally I have them both on my computer. And I admit MSVC is easier to use personally I find it a lot easier for windows programming other than that you can do the same great game on any of the two...Dev-C++ is a little harder but is not a bad IDE, don''t try to find the solution in a better compiler cuz they don''t write the code for you, that you have to learn how to do it in your own...

The monkeys are listening...

Loading a bmp...(sweet snippets)

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