int R2Image::
WriteBMP(const char *filename) const
{
// Open file
FILE *fp = fopen(filename, "wb");
if (!fp) {
fprintf(stderr, "Unable to open image file: %s\n", filename);
return 0;
}
// Compute number of bytes in row
int rowsize = 3 * width;
if ((rowsize % 4) != 0) rowsize = (rowsize / 4 + 1) * 4;
// Write file header
BITMAPFILEHEADER bmfh;
bmfh.bfType = BMP_BF_TYPE;
bmfh.bfSize = BMP_BF_OFF_BITS + rowsize * height;
bmfh.bfReserved1 = 0;
bmfh.bfReserved2 = 0;
bmfh.bfOffBits = BMP_BF_OFF_BITS;
WordWriteLE(bmfh.bfType, fp);
DWordWriteLE(bmfh.bfSize, fp);
WordWriteLE(bmfh.bfReserved1, fp);
WordWriteLE(bmfh.bfReserved2, fp);
DWordWriteLE(bmfh.bfOffBits, fp);
// Write info header
BITMAPINFOHEADER bmih;
bmih.biSize = BMP_BI_SIZE;
bmih.biWidth = width;
bmih.biHeight = height;
bmih.biPlanes = 1;
bmih.biBitCount = 24; /* RGB */
bmih.biCompression = BI_RGB; /* RGB */
bmih.biSizeImage = rowsize * (unsigned int) bmih.biHeight; /* RGB */
bmih.biXPelsPerMeter = 2925;
bmih.biYPelsPerMeter = 2925;
bmih.biClrUsed = 0;
bmih.biClrImportant = 0;
DWordWriteLE(bmih.biSize, fp);
LongWriteLE(bmih.biWidth, fp);
LongWriteLE(bmih.biHeight, fp);
WordWriteLE(bmih.biPlanes, fp);
WordWriteLE(bmih.biBitCount, fp);
DWordWriteLE(bmih.biCompression, fp);
DWordWriteLE(bmih.biSizeImage, fp);
LongWriteLE(bmih.biXPelsPerMeter, fp);
LongWriteLE(bmih.biYPelsPerMeter, fp);
DWordWriteLE(bmih.biClrUsed, fp);
DWordWriteLE(bmih.biClrImportant, fp);
// Write image, swapping blue and red in each pixel
int pad = rowsize - width * 3;
for (int j = 0; j < height; j++) {
for (int i = 0; i < width; i++) {
const R2Pixel& pixel = (*this)[i][j];
double r = 255.0 * pixel.Red();
double g = 255.0 * pixel.Green();
double b = 255.0 * pixel.Blue();
if (r >= 255) r = 255;
if (g >= 255) g = 255;
if (b >= 255) b = 255;
fputc((unsigned char) b, fp);
fputc((unsigned char) g, fp);
fputc((unsigned char) r, fp);
}
// Pad row
for (int i = 0; i < pad; i++) fputc(0, fp);
}
// Close file
fclose(fp);
// Return success
return 1;
}
int R2Image::
WriteBMP(const char *filename) const
{
// Check ncomponents
assert(ncomponents == 3);
// Open file
FILE *fp = fopen(filename, "wb");
if (!fp) {
fprintf(stderr, "Unable to open image file: %s", filename);
return 0;
}
// Write file header
BITMAPFILEHEADER bmfh;
bmfh.bfType = BMP_BF_TYPE;
bmfh.bfSize = BMP_BF_OFF_BITS + rowsize * height;
bmfh.bfReserved1 = 0;
bmfh.bfReserved2 = 0;
bmfh.bfOffBits = BMP_BF_OFF_BITS;
WordWriteLE(bmfh.bfType, fp);
DWordWriteLE(bmfh.bfSize, fp);
WordWriteLE(bmfh.bfReserved1, fp);
WordWriteLE(bmfh.bfReserved2, fp);
DWordWriteLE(bmfh.bfOffBits, fp);
// Write info header
BITMAPINFOHEADER bmih;
bmih.biSize = BMP_BI_SIZE;
bmih.biWidth = width;
bmih.biHeight = height;
bmih.biPlanes = 1;
bmih.biBitCount = 24; /* RGB */
bmih.biCompression = BI_RGB; /* RGB */
bmih.biSizeImage = rowsize * (unsigned int) bmih.biHeight; /* RGB */
bmih.biXPelsPerMeter = 2925;
bmih.biYPelsPerMeter = 2925;
bmih.biClrUsed = 0;
bmih.biClrImportant = 0;
DWordWriteLE(bmih.biSize, fp);
LongWriteLE(bmih.biWidth, fp);
LongWriteLE(bmih.biHeight, fp);
WordWriteLE(bmih.biPlanes, fp);
WordWriteLE(bmih.biBitCount, fp);
DWordWriteLE(bmih.biCompression, fp);
DWordWriteLE(bmih.biSizeImage, fp);
LongWriteLE(bmih.biXPelsPerMeter, fp);
LongWriteLE(bmih.biYPelsPerMeter, fp);
DWordWriteLE(bmih.biClrUsed, fp);
DWordWriteLE(bmih.biClrImportant, fp);
// Write image, swapping blue and red in each pixel
int pad = rowsize - width * 3;
for (int j = 0; j < height; j++) {
// Write row of pixels BGR
unsigned char *p = &pixels[j * rowsize];
for (int i = 0; i < width; i++) {
fputc(*(p+2), fp);
fputc(*(p+1), fp);
fputc(*(p+0), fp);
p += 3;
}
// Pad row
for (int i = 0; i < pad; i++) fputc(0, fp);
}
// Close file
fclose(fp);
// Return success
return 1;
}
