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EasyBMP.cpp
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/*************************************************
* *
* EasyBMP Cross-Platform Windows Bitmap Library *
* *
* Author: Paul Macklin *
* email: macklin01@users.sourceforge.net *
* support: http://easybmp.sourceforge.net *
* *
* file: EasyBMP.cpp *
* date added: 03-31-2006 *
* date modified: 12-01-2006 *
* version: 1.06 *
* *
* License: BSD (revised/modified) *
* Copyright: 2005-6 by the EasyBMP Project *
* *
* description: Actual source file *
* *
*************************************************/
#include "EasyBMP.h"
/* These functions are defined in EasyBMP.h */
bool EasyBMPwarnings = true;
void SetEasyBMPwarningsOff(void)
{
EasyBMPwarnings = false;
}
void SetEasyBMPwarningsOn(void)
{
EasyBMPwarnings = true;
}
bool GetEasyBMPwarningState(void)
{
return EasyBMPwarnings;
}
/* These functions are defined in EasyBMP_DataStructures.h */
int IntPow(int base, int exponent)
{
int i;
int output = 1;
for (i = 0; i < exponent; i++)
{
output *= base;
}
return output;
}
BMFH::BMFH()
{
bfType = 19778;
bfReserved1 = 0;
bfReserved2 = 0;
}
void BMFH::SwitchEndianess(void)
{
bfType = FlipWORD(bfType);
bfSize = FlipDWORD(bfSize);
bfReserved1 = FlipWORD(bfReserved1);
bfReserved2 = FlipWORD(bfReserved2);
bfOffBits = FlipDWORD(bfOffBits);
return;
}
BMIH::BMIH()
{
biPlanes = 1;
biCompression = 0;
biXPelsPerMeter = DefaultXPelsPerMeter;
biYPelsPerMeter = DefaultYPelsPerMeter;
biClrUsed = 0;
biClrImportant = 0;
}
void BMIH::SwitchEndianess(void)
{
biSize = FlipDWORD(biSize);
biWidth = FlipDWORD(biWidth);
biHeight = FlipDWORD(biHeight);
biPlanes = FlipWORD(biPlanes);
biBitCount = FlipWORD(biBitCount);
biCompression = FlipDWORD(biCompression);
biSizeImage = FlipDWORD(biSizeImage);
biXPelsPerMeter = FlipDWORD(biXPelsPerMeter);
biYPelsPerMeter = FlipDWORD(biYPelsPerMeter);
biClrUsed = FlipDWORD(biClrUsed);
biClrImportant = FlipDWORD(biClrImportant);
return;
}
void BMIH::display(void)
{
using namespace std;
cout << "biSize: " << (int)biSize << endl
<< "biWidth: " << (int)biWidth << endl
<< "biHeight: " << (int)biHeight << endl
<< "biPlanes: " << (int)biPlanes << endl
<< "biBitCount: " << (int)biBitCount << endl
<< "biCompression: " << (int)biCompression << endl
<< "biSizeImage: " << (int)biSizeImage << endl
<< "biXPelsPerMeter: " << (int)biXPelsPerMeter << endl
<< "biYPelsPerMeter: " << (int)biYPelsPerMeter << endl
<< "biClrUsed: " << (int)biClrUsed << endl
<< "biClrImportant: " << (int)biClrImportant << endl << endl;
}
void BMFH::display(void)
{
using namespace std;
cout << "bfType: " << (int)bfType << endl
<< "bfSize: " << (int)bfSize << endl
<< "bfReserved1: " << (int)bfReserved1 << endl
<< "bfReserved2: " << (int)bfReserved2 << endl
<< "bfOffBits: " << (int)bfOffBits << endl << endl;
}
/* These functions are defined in EasyBMP_BMP.h */
RGBApixel BMP::GetPixel(int i, int j) const
{
using namespace std;
bool Warn = false;
if (i >= Width)
{
i = Width - 1; Warn = true;
}
if (i < 0)
{
i = 0; Warn = true;
}
if (j >= Height)
{
j = Height - 1; Warn = true;
}
if (j < 0)
{
j = 0; Warn = true;
}
if (Warn && EasyBMPwarnings)
{
cout << "EasyBMP Warning: Attempted to access non-existent pixel;" << endl
<< " Truncating request to fit in the range [0,"
<< Width - 1 << "] x [0," << Height - 1 << "]." << endl;
}
return Pixels[i][j];
}
bool BMP::SetPixel(int i, int j, RGBApixel NewPixel)
{
Pixels[i][j] = NewPixel;
return true;
}
bool BMP::SetColor(int ColorNumber, RGBApixel NewColor)
{
using namespace std;
if (BitDepth != 1 && BitDepth != 4 && BitDepth != 8)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: Attempted to change color table for a BMP object" << endl
<< " that lacks a color table. Ignoring request." << endl;
}
return false;
}
if (!Colors)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: Attempted to set a color, but the color table" << endl
<< " is not defined. Ignoring request." << endl;
}
return false;
}
if (ColorNumber >= TellNumberOfColors())
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: Requested color number "
<< ColorNumber << " is outside the allowed" << endl
<< " range [0," << TellNumberOfColors() - 1
<< "]. Ignoring request to set this color." << endl;
}
return false;
}
Colors[ColorNumber] = NewColor;
return true;
}
// RGBApixel BMP::GetColor( int ColorNumber ) const
RGBApixel BMP::GetColor(int ColorNumber)
{
RGBApixel Output;
Output.Red = 255;
Output.Green = 255;
Output.Blue = 255;
Output.Alpha = 0;
using namespace std;
if (BitDepth != 1 && BitDepth != 4 && BitDepth != 8)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: Attempted to access color table for a BMP object" << endl
<< " that lacks a color table. Ignoring request." << endl;
}
return Output;
}
if (!Colors)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: Requested a color, but the color table" << endl
<< " is not defined. Ignoring request." << endl;
}
return Output;
}
if (ColorNumber >= TellNumberOfColors())
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: Requested color number "
<< ColorNumber << " is outside the allowed" << endl
<< " range [0," << TellNumberOfColors() - 1
<< "]. Ignoring request to get this color." << endl;
}
return Output;
}
Output = Colors[ColorNumber];
return Output;
}
BMP::BMP()
{
Width = 1;
Height = 1;
BitDepth = 24;
Pixels = new RGBApixel*[Width];
Pixels[0] = new RGBApixel[Height];
Colors = NULL;
XPelsPerMeter = 0;
YPelsPerMeter = 0;
MetaData1 = NULL;
SizeOfMetaData1 = 0;
MetaData2 = NULL;
SizeOfMetaData2 = 0;
}
// BMP::BMP( const BMP& Input )
BMP::BMP(BMP& Input)
{
// first, make the image empty.
Width = 1;
Height = 1;
BitDepth = 24;
Pixels = new RGBApixel*[Width];
Pixels[0] = new RGBApixel[Height];
Colors = NULL;
XPelsPerMeter = 0;
YPelsPerMeter = 0;
MetaData1 = NULL;
SizeOfMetaData1 = 0;
MetaData2 = NULL;
SizeOfMetaData2 = 0;
// now, set the correct bit depth
SetBitDepth(Input.TellBitDepth());
// set the correct pixel size
SetSize(Input.TellWidth(), Input.TellHeight());
// set the DPI information from Input
SetDPI(Input.TellHorizontalDPI(), Input.TellVerticalDPI());
// if there is a color table, get all the colors
if (BitDepth == 1 || BitDepth == 4 ||
BitDepth == 8)
{
for (int k = 0; k < TellNumberOfColors(); k++)
{
SetColor(k, Input.GetColor(k));
}
}
// get all the pixels
for (int j = 0; j < Height; j++)
{
for (int i = 0; i < Width; i++)
{
Pixels[i][j] = *Input(i, j);
// Pixels[i][j] = Input.GetPixel(i,j); // *Input(i,j);
}
}
}
BMP::~BMP()
{
int i;
for (i = 0; i<Width; i++)
{
delete[] Pixels[i];
}
delete[] Pixels;
if (Colors)
{
delete[] Colors;
}
if (MetaData1)
{
delete[] MetaData1;
}
if (MetaData2)
{
delete[] MetaData2;
}
}
RGBApixel* BMP::operator()(int i, int j)
{
using namespace std;
bool Warn = false;
if (i >= Width)
{
i = Width - 1; Warn = true;
}
if (i < 0)
{
i = 0; Warn = true;
}
if (j >= Height)
{
j = Height - 1; Warn = true;
}
if (j < 0)
{
j = 0; Warn = true;
}
if (Warn && EasyBMPwarnings)
{
cout << "EasyBMP Warning: Attempted to access non-existent pixel;" << endl
<< " Truncating request to fit in the range [0,"
<< Width - 1 << "] x [0," << Height - 1 << "]." << endl;
}
return &(Pixels[i][j]);
}
// int BMP::TellBitDepth( void ) const
int BMP::TellBitDepth(void)
{
return BitDepth;
}
// int BMP::TellHeight( void ) const
int BMP::TellHeight(void)
{
return Height;
}
// int BMP::TellWidth( void ) const
int BMP::TellWidth(void)
{
return Width;
}
// int BMP::TellNumberOfColors( void ) const
int BMP::TellNumberOfColors(void)
{
int output = IntPow(2, BitDepth);
if (BitDepth == 32)
{
output = IntPow(2, 24);
}
return output;
}
bool BMP::SetBitDepth(int NewDepth)
{
using namespace std;
if (NewDepth != 1 && NewDepth != 4 &&
NewDepth != 8 && NewDepth != 16 &&
NewDepth != 24 && NewDepth != 32)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: User attempted to set unsupported bit depth "
<< NewDepth << "." << endl
<< " Bit depth remains unchanged at "
<< BitDepth << "." << endl;
}
return false;
}
BitDepth = NewDepth;
if (Colors)
{
delete[] Colors;
}
int NumberOfColors = IntPow(2, BitDepth);
if (BitDepth == 1 || BitDepth == 4 || BitDepth == 8)
{
Colors = new RGBApixel[NumberOfColors];
}
else
{
Colors = NULL;
}
if (BitDepth == 1 || BitDepth == 4 || BitDepth == 8)
{
CreateStandardColorTable();
}
return true;
}
bool BMP::SetSize(int NewWidth, int NewHeight)
{
using namespace std;
if (NewWidth <= 0 || NewHeight <= 0)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: User attempted to set a non-positive width or height." << endl
<< " Size remains unchanged at "
<< Width << " x " << Height << "." << endl;
}
return false;
}
int i, j;
for (i = 0; i<Width; i++)
{
delete[] Pixels[i];
}
delete[] Pixels;
Width = NewWidth;
Height = NewHeight;
Pixels = new RGBApixel*[Width];
for (i = 0; i<Width; i++)
{
Pixels[i] = new RGBApixel[Height];
}
for (i = 0; i < Width; i++)
{
for (j = 0; j < Height; j++)
{
Pixels[i][j].Red = 255;
Pixels[i][j].Green = 255;
Pixels[i][j].Blue = 255;
Pixels[i][j].Alpha = 0;
}
}
return true;
}
bool BMP::WriteToFile(const char* FileName)
{
using namespace std;
if (!EasyBMPcheckDataSize())
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: Data types are wrong size!" << endl
<< " You may need to mess with EasyBMP_DataTypes.h" << endl
<< " to fix these errors, and then recompile." << endl
<< " All 32-bit and 64-bit machines should be" << endl
<< " supported, however." << endl << endl;
}
return false;
}
FILE* fp = fopen(FileName, "wb");
if (fp == NULL)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: Cannot open file "
<< FileName << " for output." << endl;
}
fclose(fp);
return false;
}
// some preliminaries
double dBytesPerPixel = ((double)BitDepth) / 8.0;
double dBytesPerRow = dBytesPerPixel * (Width + 0.0);
dBytesPerRow = ceil(dBytesPerRow);
int BytePaddingPerRow = 4 - ((int)(dBytesPerRow)) % 4;
if (BytePaddingPerRow == 4)
{
BytePaddingPerRow = 0;
}
double dActualBytesPerRow = dBytesPerRow + BytePaddingPerRow;
double dTotalPixelBytes = Height * dActualBytesPerRow;
double dPaletteSize = 0;
if (BitDepth == 1 || BitDepth == 4 || BitDepth == 8)
{
dPaletteSize = IntPow(2, BitDepth)*4.0;
}
// leave some room for 16-bit masks
if (BitDepth == 16)
{
dPaletteSize = 3 * 4;
}
double dTotalFileSize = 14 + 40 + dPaletteSize + dTotalPixelBytes;
// write the file header
BMFH bmfh;
bmfh.bfSize = (ebmpDWORD)dTotalFileSize;
bmfh.bfReserved1 = 0;
bmfh.bfReserved2 = 0;
bmfh.bfOffBits = (ebmpDWORD)(14 + 40 + dPaletteSize);
if (IsBigEndian())
{
bmfh.SwitchEndianess();
}
fwrite((char*)&(bmfh.bfType), sizeof(ebmpWORD), 1, fp);
fwrite((char*)&(bmfh.bfSize), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmfh.bfReserved1), sizeof(ebmpWORD), 1, fp);
fwrite((char*)&(bmfh.bfReserved2), sizeof(ebmpWORD), 1, fp);
fwrite((char*)&(bmfh.bfOffBits), sizeof(ebmpDWORD), 1, fp);
// write the info header
BMIH bmih;
bmih.biSize = 40;
bmih.biWidth = Width;
bmih.biHeight = Height;
bmih.biPlanes = 1;
bmih.biBitCount = BitDepth;
bmih.biCompression = 0;
bmih.biSizeImage = (ebmpDWORD)dTotalPixelBytes;
if (XPelsPerMeter)
{
bmih.biXPelsPerMeter = XPelsPerMeter;
}
else
{
bmih.biXPelsPerMeter = DefaultXPelsPerMeter;
}
if (YPelsPerMeter)
{
bmih.biYPelsPerMeter = YPelsPerMeter;
}
else
{
bmih.biYPelsPerMeter = DefaultYPelsPerMeter;
}
bmih.biClrUsed = 0;
bmih.biClrImportant = 0;
// indicates that we'll be using bit fields for 16-bit files
if (BitDepth == 16)
{
bmih.biCompression = 3;
}
if (IsBigEndian())
{
bmih.SwitchEndianess();
}
fwrite((char*)&(bmih.biSize), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biWidth), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biHeight), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biPlanes), sizeof(ebmpWORD), 1, fp);
fwrite((char*)&(bmih.biBitCount), sizeof(ebmpWORD), 1, fp);
fwrite((char*)&(bmih.biCompression), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biSizeImage), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biXPelsPerMeter), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biYPelsPerMeter), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biClrUsed), sizeof(ebmpDWORD), 1, fp);
fwrite((char*)&(bmih.biClrImportant), sizeof(ebmpDWORD), 1, fp);
// write the palette
if (BitDepth == 1 || BitDepth == 4 || BitDepth == 8)
{
int NumberOfColors = IntPow(2, BitDepth);
// if there is no palette, create one
if (!Colors)
{
if (!Colors)
{
Colors = new RGBApixel[NumberOfColors];
}
CreateStandardColorTable();
}
int n;
for (n = 0; n < NumberOfColors; n++)
{
fwrite((char*)&(Colors[n]), 4, 1, fp);
}
}
// write the pixels
int i, j;
if (BitDepth != 16)
{
ebmpBYTE* Buffer;
int BufferSize = (int)((Width*BitDepth) / 8.0);
while (8 * BufferSize < Width*BitDepth)
{
BufferSize++;
}
while (BufferSize % 4)
{
BufferSize++;
}
Buffer = new ebmpBYTE[BufferSize];
for (j = 0; j < BufferSize; j++)
{
Buffer[j] = 0;
}
j = Height - 1;
while (j > -1)
{
bool Success = false;
if (BitDepth == 32)
{
Success = Write32bitRow(Buffer, BufferSize, j);
}
if (BitDepth == 24)
{
Success = Write24bitRow(Buffer, BufferSize, j);
}
if (BitDepth == 8)
{
Success = Write8bitRow(Buffer, BufferSize, j);
}
if (BitDepth == 4)
{
Success = Write4bitRow(Buffer, BufferSize, j);
}
if (BitDepth == 1)
{
Success = Write1bitRow(Buffer, BufferSize, j);
}
if (Success)
{
int BytesWritten = (int)fwrite((char*)Buffer, 1, BufferSize, fp);
if (BytesWritten != BufferSize)
{
Success = false;
}
}
if (!Success)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: Could not write proper amount of data." << endl;
}
j = -1;
}
j--;
}
delete[] Buffer;
}
if (BitDepth == 16)
{
// write the bit masks
ebmpWORD BlueMask = 31; // bits 12-16
ebmpWORD GreenMask = 2016; // bits 6-11
ebmpWORD RedMask = 63488; // bits 1-5
ebmpWORD ZeroWORD;
if (IsBigEndian())
{
RedMask = FlipWORD(RedMask);
}
fwrite((char*)&RedMask, 2, 1, fp);
fwrite((char*)&ZeroWORD, 2, 1, fp);
if (IsBigEndian())
{
GreenMask = FlipWORD(GreenMask);
}
fwrite((char*)&GreenMask, 2, 1, fp);
fwrite((char*)&ZeroWORD, 2, 1, fp);
if (IsBigEndian())
{
BlueMask = FlipWORD(BlueMask);
}
fwrite((char*)&BlueMask, 2, 1, fp);
fwrite((char*)&ZeroWORD, 2, 1, fp);
int DataBytes = Width * 2;
int PaddingBytes = (4 - DataBytes % 4) % 4;
// write the actual pixels
for (j = Height - 1; j >= 0; j--)
{
// write all row pixel data
i = 0;
int WriteNumber = 0;
while (WriteNumber < DataBytes)
{
ebmpWORD TempWORD;
ebmpWORD RedWORD = (ebmpWORD)((Pixels[i][j]).Red / 8);
ebmpWORD GreenWORD = (ebmpWORD)((Pixels[i][j]).Green / 4);
ebmpWORD BlueWORD = (ebmpWORD)((Pixels[i][j]).Blue / 8);
TempWORD = (RedWORD << 11) + (GreenWORD << 5) + BlueWORD;
if (IsBigEndian())
{
TempWORD = FlipWORD(TempWORD);
}
fwrite((char*)&TempWORD, 2, 1, fp);
WriteNumber += 2;
i++;
}
// write any necessary row padding
WriteNumber = 0;
while (WriteNumber < PaddingBytes)
{
ebmpBYTE TempBYTE;
fwrite((char*)&TempBYTE, 1, 1, fp);
WriteNumber++;
}
}
}
fclose(fp);
return true;
}
bool BMP::ReadFromFile(const char* FileName)
{
using namespace std;
if (!EasyBMPcheckDataSize())
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: Data types are wrong size!" << endl
<< " You may need to mess with EasyBMP_DataTypes.h" << endl
<< " to fix these errors, and then recompile." << endl
<< " All 32-bit and 64-bit machines should be" << endl
<< " supported, however." << endl << endl;
}
return false;
}
FILE* fp = fopen(FileName, "rb");
if (fp == NULL)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: Cannot open file "
<< FileName << " for input." << endl;
}
SetBitDepth(1);
SetSize(1, 1);
return false;
}
// read the file header
BMFH bmfh;
bool NotCorrupted = true;
NotCorrupted &= SafeFread((char*)&(bmfh.bfType), sizeof(ebmpWORD), 1, fp);
bool IsBitmap = false;
if (IsBigEndian() && bmfh.bfType == 16973)
{
IsBitmap = true;
}
if (!IsBigEndian() && bmfh.bfType == 19778)
{
IsBitmap = true;
}
if (!IsBitmap)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName
<< " is not a Windows BMP file!" << endl;
}
fclose(fp);
return false;
}
NotCorrupted &= SafeFread((char*)&(bmfh.bfSize), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmfh.bfReserved1), sizeof(ebmpWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmfh.bfReserved2), sizeof(ebmpWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmfh.bfOffBits), sizeof(ebmpDWORD), 1, fp);
if (IsBigEndian())
{
bmfh.SwitchEndianess();
}
// read the info header
BMIH bmih;
NotCorrupted &= SafeFread((char*)&(bmih.biSize), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biWidth), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biHeight), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biPlanes), sizeof(ebmpWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biBitCount), sizeof(ebmpWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biCompression), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biSizeImage), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biXPelsPerMeter), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biYPelsPerMeter), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biClrUsed), sizeof(ebmpDWORD), 1, fp);
NotCorrupted &= SafeFread((char*)&(bmih.biClrImportant), sizeof(ebmpDWORD), 1, fp);
if (IsBigEndian())
{
bmih.SwitchEndianess();
}
// a safety catch: if any of the header information didn't read properly, abort
// future idea: check to see if at least most is self-consistent
if (!NotCorrupted)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName
<< " is obviously corrupted." << endl;
}
SetSize(1, 1);
SetBitDepth(1);
fclose(fp);
return false;
}
XPelsPerMeter = bmih.biXPelsPerMeter;
YPelsPerMeter = bmih.biYPelsPerMeter;
// if bmih.biCompression 1 or 2, then the file is RLE compressed
if (bmih.biCompression == 1 || bmih.biCompression == 2)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName << " is (RLE) compressed." << endl
<< " EasyBMP does not support compression." << endl;
}
SetSize(1, 1);
SetBitDepth(1);
fclose(fp);
return false;
}
// if bmih.biCompression > 3, then something strange is going on
// it's probably an OS2 bitmap file.
if (bmih.biCompression > 3)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName << " is in an unsupported format."
<< endl
<< " (bmih.biCompression = "
<< bmih.biCompression << ")" << endl
<< " The file is probably an old OS2 bitmap or corrupted."
<< endl;
}
SetSize(1, 1);
SetBitDepth(1);
fclose(fp);
return false;
}
if (bmih.biCompression == 3 && bmih.biBitCount != 16)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName
<< " uses bit fields and is not a" << endl
<< " 16-bit file. This is not supported." << endl;
}
SetSize(1, 1);
SetBitDepth(1);
fclose(fp);
return false;
}
// set the bit depth
int TempBitDepth = (int)bmih.biBitCount;
if (TempBitDepth != 1 && TempBitDepth != 4
&& TempBitDepth != 8 && TempBitDepth != 16
&& TempBitDepth != 24 && TempBitDepth != 32)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName << " has unrecognized bit depth." << endl;
}
SetSize(1, 1);
SetBitDepth(1);
fclose(fp);
return false;
}
SetBitDepth((int)bmih.biBitCount);
// set the size
if ((int)bmih.biWidth <= 0 || (int)bmih.biHeight <= 0)
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Error: " << FileName
<< " has a non-positive width or height." << endl;
}
SetSize(1, 1);
SetBitDepth(1);
fclose(fp);
return false;
}
SetSize((int)bmih.biWidth, (int)bmih.biHeight);
// some preliminaries
double dBytesPerPixel = ((double)BitDepth) / 8.0;
double dBytesPerRow = dBytesPerPixel * (Width + 0.0);
dBytesPerRow = ceil(dBytesPerRow);
int BytePaddingPerRow = 4 - ((int)(dBytesPerRow)) % 4;
if (BytePaddingPerRow == 4)
{
BytePaddingPerRow = 0;
}
// if < 16 bits, read the palette
if (BitDepth < 16)
{
// determine the number of colors specified in the
// color table
int NumberOfColorsToRead = ((int)bmfh.bfOffBits - 54) / 4;
if (NumberOfColorsToRead > IntPow(2, BitDepth))
{
NumberOfColorsToRead = IntPow(2, BitDepth);
}
if (NumberOfColorsToRead < TellNumberOfColors())
{
if (EasyBMPwarnings)
{
cout << "EasyBMP Warning: file " << FileName << " has an underspecified" << endl
<< " color table. The table will be padded with extra" << endl
<< " white (255,255,255,0) entries." << endl;
}
}
int n;
for (n = 0; n < NumberOfColorsToRead; n++)
{
SafeFread((char*)&(Colors[n]), 4, 1, fp);