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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.1.1 (2012/07/04)
#include <windows.h>
#include <cassert>
#include <cstdio>
#pragma warning(disable:4996)
//----------------------------------------------------------------------------
void LoadBMP (const char* name, int& width, int& height,
unsigned char*& data)
{
HBITMAP hImage = (HBITMAP) LoadImage(NULL, name, IMAGE_BITMAP, 0, 0,
LR_LOADFROMFILE | LR_CREATEDIBSECTION);
assert(hImage);
DIBSECTION dibSection;
GetObject(hImage, sizeof(DIBSECTION), &dibSection);
width = dibSection.dsBm.bmWidth;
height = dibSection.dsBm.bmHeight;
assert(dibSection.dsBm.bmBitsPixel == 24);
data = new unsigned char[3*width*height];
memcpy(data, dibSection.dsBm.bmBits, 3*width*height);
DeleteObject(hImage);
}
//----------------------------------------------------------------------------
void SaveBMP (const char* name, int width, int height, unsigned char* data)
{
assert((width % 4) == 0);
int quantity = width*height;
int numBytes = 3*quantity;
BITMAPFILEHEADER fileHeader;
fileHeader.bfType = 0x4d42; // "BM"
fileHeader.bfSize =
sizeof(BITMAPFILEHEADER) +
sizeof(BITMAPINFOHEADER) +
numBytes;
fileHeader.bfReserved1 = 0;
fileHeader.bfReserved2 = 0;
fileHeader.bfOffBits =
sizeof(BITMAPFILEHEADER) +
sizeof(BITMAPINFOHEADER);
BITMAPINFOHEADER infoHeader;
infoHeader.biSize = sizeof(BITMAPINFOHEADER);
infoHeader.biWidth = width;
infoHeader.biHeight = height;
infoHeader.biPlanes = 1;
infoHeader.biBitCount = 24;
infoHeader.biCompression = BI_RGB;
infoHeader.biSizeImage = 0;
infoHeader.biXPelsPerMeter = 0;
infoHeader.biYPelsPerMeter = 0;
infoHeader.biClrUsed = 0;
infoHeader.biClrImportant = 0;
FILE* outFile = fopen(name, "wb");
fwrite(&fileHeader, sizeof(BITMAPFILEHEADER), 1, outFile);
fwrite(&infoHeader, sizeof(BITMAPINFOHEADER), 1, outFile);
fwrite(data, sizeof(unsigned char), numBytes, outFile);
fclose(outFile);
}
//----------------------------------------------------------------------------
int main (int, char** arguments)
{
int width, height;
unsigned char* data;
LoadBMP(arguments[1], width, height, data);
unsigned char* color = data;
for (int i = 0; i < width*height; ++i, color += 3)
{
float b = (float)color[0];
float g = (float)color[1];
float r = (float)color[2];
unsigned char gray = (unsigned char)(0.30f*r + 0.59f*g + 0.11f*b);
color[0] = gray;
color[1] = gray;
color[2] = gray;
}
SaveBMP(arguments[2], width, height, data);
delete[] data;
return 0;
}
//----------------------------------------------------------------------------
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