Image* loadBMP( std::string filename) {
ifstream input;
input.open(filename.c_str(), ifstream::binary);
assert(!input.fail() || !"Could not find file");
char buffer[2];
input.read(buffer, 2);
assert((buffer[0] == 'B' && buffer[1] == 'M') || !"Not a bitmap file");
input.ignore(8);
int dataOffset = readInt(input);
//Read the header
int headerSize = readInt(input);
int width;
int height;
switch(headerSize) {
case 40:
//V3
width = readInt(input);
height = readInt(input);
input.ignore(2);
assert(readShort(input) == 24 || !"Image is not 24 bits per pixel");
assert(readShort(input) == 0 || !"Image is compressed");
break;
case 12:
//OS/2 V1
width = readShort(input);
height = readShort(input);
input.ignore(2);
assert(readShort(input) == 24 || !"Image is not 24 bits per pixel");
break;
case 64:
//OS/2 V2
assert(!"Can't load OS/2 V2 bitmaps");
break;
case 108:
//Windows V4
assert(!"Can't load Windows V4 bitmaps");
break;
case 124:
//Windows V5
assert(!"Can't load Windows V5 bitmaps");
break;
default:
assert(!"Unknown bitmap format");
}
//Read the data
int bytesPerRow = ((width * 3 + 3) / 4) * 4 - (width * 3 % 4);
int size = bytesPerRow * height;
auto_array<char> pixels(new char[size]);
input.seekg(dataOffset, ios_base::beg);
input.read(pixels.get(), size);
//Get the data into the right format
auto_array<char> pixels2(new char[width * height * 3]);
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x++) {
for(int c = 0; c < 3; c++) {
pixels2[3 * (width * y + x) + c] =
pixels[bytesPerRow * y + 3 * x + (2 - c)];
}
}
}
input.close();
return new Image(pixels2.release(), width, height);
}
bool Image2D::LoadBMP(char* filename)
{
std::ifstream input;
input.open(filename, std::ifstream::binary);
assert(!input.fail() || !"Could not find file");
char buffer[2];
input.read(buffer, 2);
assert(buffer[0] == 'B' && buffer[1] == 'M' || !"Not a bitmap file");
input.ignore(8);
int dataOffset = readInt(input);
//Read the header
int headerSize = readInt(input);
switch(headerSize)
{
case 40:
//V3
this->width = readInt(input);
this->height = readInt(input);
input.ignore(2);
assert(readShort(input) == 24 || !"Image is not 24 bits per pixel");
assert(readShort(input) == 0 || !"Image is compressed");
break;
case 12:
//OS/2 V1
this->width = readShort(input);
this->height = readShort(input);
input.ignore(2);
assert(readShort(input) == 24 || !"Image is not 24 bits per pixel");
break;
case 64:
//OS/2 V2
assert(!"Can't load OS/2 V2 bitmaps");
break;
case 108:
//Windows V4
assert(!"Can't load Windows V4 bitmaps");
break;
case 124:
//Windows V5
assert(!"Can't load Windows V5 bitmaps");
break;
default:
assert(!"Unknown bitmap format");
}
//Read the data
int bytesPerRow = ((this->width * 3 + 3) / 4) * 4 - (this->width * 3 % 4);
int size = bytesPerRow * this->height;
cgl::auto_array<char> pixels(new char[size]);
input.seekg(dataOffset, std::ios_base::beg);
input.read(pixels.Get(), size);
//Get the data into the right format
cgl::auto_array<char> pixels2(new char[this->width * this->height * 3]);
for(int y = 0; y < this->height; y++)
{
for(int x = 0; x < this->width; x++)
{
for(int c = 0; c < 3; c++)
{
pixels2[3 * (this->width * y + x) + c] = pixels[bytesPerRow * y + 3 * x + (2 - c)];
}
}
}
input.close();
this->dataBMP = pixels2.Release();
glGenTextures(1, &this->ID); //Make room for our texture
glBindTexture(GL_TEXTURE_2D, this->ID); //Tell OpenGL which texture to edit
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, //Always GL_TEXTURE_2D
0, //0 for now
GL_RGB, //Format OpenGL uses for image
this->width, this->height, //Width and height
0, //The border of the image
GL_RGB, //GL_RGB, because pixels are stored in RGB format
GL_UNSIGNED_BYTE, //GL_UNSIGNED_BYTE, because pixels are stored
//as unsigned numbers
this->dataBMP); //The actual pixel data*/
return true;
}
