void Image::SaveTGA(const char *filename) const {
assert(filename != NULL);
// must end in .tga
const char *ext = &filename[strlen(filename)-4];
assert(!strcmp(ext,".tga"));
FILE *file = fopen(filename,"wb");
// misc header information
for (int i = 0; i < 18; i++) {
//unsigned char tmp;
if (i == 2) WriteByte(file,2);
else if (i == 12) WriteByte(file,width%256);
else if (i == 13) WriteByte(file,width/256);
else if (i == 14) WriteByte(file,height%256);
else if (i == 15) WriteByte(file,height/256);
else if (i == 16) WriteByte(file,24);
else if (i == 17) WriteByte(file,32);
else WriteByte(file,0);
}
// the data
// flip y so that (0,0) is bottom left corner
for (int y = height-1; y >= 0; y--) {
for (int x = 0; x < width; x++) {
Vec3f v = GetPixel(x,y);
// note reversed order: b, g, r
WriteByte(file,ClampColorComponent(v.b()));
WriteByte(file,ClampColorComponent(v.g()));
WriteByte(file,ClampColorComponent(v.r()));
}
}
fclose(file);
}
void Image::SavePPM(const char *filename) const {
assert(filename != NULL);
// must end in .ppm
const char *ext = &filename[strlen(filename)-4];
assert(!strcmp(ext,".ppm"));
FILE *file = fopen(filename, "w");
// misc header information
assert(file != NULL);
fprintf (file, "P6\n");
fprintf (file, "# Creator: Image::SavePPM()\n");
fprintf (file, "%d %d\n", width,height);
fprintf (file, "255\n");
// the data
// flip y so that (0,0) is bottom left corner
for (int y = height-1; y >= 0; y--) {
for (int x=0; x<width; x++) {
Vec3f v = GetPixel(x,y);
fputc (ClampColorComponent(v.r()),file);
fputc (ClampColorComponent(v.g()),file);
fputc (ClampColorComponent(v.b()),file);
}
}
fclose(file);
}
int
Image::SaveBMP(const char *filename)
{
int i, j, ipos;
int bytesPerLine;
unsigned char *line;
Vector3f*rgb = data;
FILE *file;
struct BMPHeader bmph;
/* The length of each line must be a multiple of 4 bytes */
bytesPerLine = (3 * (width + 1) / 4) * 4;
strcpy(bmph.bfType, "BM");
bmph.bfOffBits = 54;
bmph.bfSize = bmph.bfOffBits + bytesPerLine * height;
bmph.bfReserved = 0;
bmph.biSize = 40;
bmph.biWidth = width;
bmph.biHeight = height;
bmph.biPlanes = 1;
bmph.biBitCount = 24;
bmph.biCompression = 0;
bmph.biSizeImage = bytesPerLine * height;
bmph.biXPelsPerMeter = 0;
bmph.biYPelsPerMeter = 0;
bmph.biClrUsed = 0;
bmph.biClrImportant = 0;
file = fopen (filename, "wb");
if (file == NULL) return(0);
fwrite(&bmph.bfType, 2, 1, file);
fwrite(&bmph.bfSize, 4, 1, file);
fwrite(&bmph.bfReserved, 4, 1, file);
fwrite(&bmph.bfOffBits, 4, 1, file);
fwrite(&bmph.biSize, 4, 1, file);
fwrite(&bmph.biWidth, 4, 1, file);
fwrite(&bmph.biHeight, 4, 1, file);
fwrite(&bmph.biPlanes, 2, 1, file);
fwrite(&bmph.biBitCount, 2, 1, file);
fwrite(&bmph.biCompression, 4, 1, file);
fwrite(&bmph.biSizeImage, 4, 1, file);
fwrite(&bmph.biXPelsPerMeter, 4, 1, file);
fwrite(&bmph.biYPelsPerMeter, 4, 1, file);
fwrite(&bmph.biClrUsed, 4, 1, file);
fwrite(&bmph.biClrImportant, 4, 1, file);
line = (unsigned char *)malloc(bytesPerLine);
if (line == NULL)
{
fprintf(stderr, "Can't allocate memory for BMP file.\n");
return(0);
}
for (i = 0; i < height ; i++)
{
for (j = 0; j < width; j++)
{
ipos = (width * i + j);
line[3*j] = ClampColorComponent(rgb[ipos][2]);
line[3*j+1] =ClampColorComponent( rgb[ipos][1]);
line[3*j+2] = ClampColorComponent( rgb[ipos][0]);
}
fwrite(line, bytesPerLine, 1, file);
}
free(line);
fclose(file);
return(1);
}
