write_os2_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) /* Write an OS2-style BMP file header, including colormap if needed */ { char bmpfileheader[14]; char bmpcoreheader[12]; INT32 headersize, bfSize; int bits_per_pixel, cmap_entries; /* Compute colormap size and total file size */ if (cinfo->out_color_space == JCS_RGB) { if (cinfo->quantize_colors) { /* Colormapped RGB */ bits_per_pixel = 8; cmap_entries = 256; } else { /* Unquantized, full color RGB */ bits_per_pixel = 24; cmap_entries = 0; } } else { /* Grayscale output. We need to fake a 256-entry colormap. */ bits_per_pixel = 8; cmap_entries = 256; } /* File size */ headersize = 14 + 12 + cmap_entries * 3; /* Header and colormap */ bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; /* Set unused fields of header to 0 */ MEMZERO(bmpfileheader, SIZEOF(bmpfileheader)); MEMZERO(bmpcoreheader, SIZEOF(bmpcoreheader)); /* Fill the file header */ bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */ bmpfileheader[1] = 0x4D; PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */ /* we leave bfReserved1 & bfReserved2 = 0 */ PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */ /* Fill the info header (Microsoft calls this a BITMAPCOREHEADER) */ PUT_2B(bmpcoreheader, 0, 12); /* bcSize */ PUT_2B(bmpcoreheader, 4, cinfo->output_width); /* bcWidth */ PUT_2B(bmpcoreheader, 6, cinfo->output_height); /* bcHeight */ PUT_2B(bmpcoreheader, 8, 1); /* bcPlanes - must be 1 */ PUT_2B(bmpcoreheader, 10, bits_per_pixel); /* bcBitCount */ if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) ERREXIT(cinfo, JERR_FILE_WRITE); if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (size_t) 12) ERREXIT(cinfo, JERR_FILE_WRITE); if (cmap_entries > 0) write_colormap(cinfo, dest, cmap_entries, 3); }
write_os2_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) { char bmpfileheader[14]; char bmpcoreheader[12]; INT32 headersize, bfSize; int bits_per_pixel, cmap_entries; if (cinfo->out_color_space == JCS_RGB) { if (cinfo->quantize_colors) { bits_per_pixel = 8; cmap_entries = 256; } else { bits_per_pixel = 24; cmap_entries = 0; } } else { bits_per_pixel = 8; cmap_entries = 256; } headersize = 14 + 12 + cmap_entries * 3; bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; MEMZERO(bmpfileheader, SIZEOF(bmpfileheader)); MEMZERO(bmpcoreheader, SIZEOF(bmpcoreheader)); bmpfileheader[0] = 0x42; bmpfileheader[1] = 0x4D; PUT_4B(bmpfileheader, 2, bfSize); PUT_4B(bmpfileheader, 10, headersize); PUT_2B(bmpcoreheader, 0, 12); PUT_2B(bmpcoreheader, 4, cinfo->output_width); PUT_2B(bmpcoreheader, 6, cinfo->output_height); PUT_2B(bmpcoreheader, 8, 1); PUT_2B(bmpcoreheader, 10, bits_per_pixel); if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) ERREXIT(cinfo, JERR_FILE_WRITE); if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (size_t) 12) ERREXIT(cinfo, JERR_FILE_WRITE); if (cmap_entries > 0) write_colormap(cinfo, dest, cmap_entries, 3); }
write_bmp_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) /* Write a Windows-style BMP file header, including colormap if needed */ { char bmpfileheader[14]; char bmpinfoheader[40]; #define PUT_2B(array,offset,value) \ (array[offset] = (char) ((value) & 0xFF), \ array[offset+1] = (char) (((value) >> 8) & 0xFF)) #define PUT_4B(array,offset,value) \ (array[offset] = (char) ((value) & 0xFF), \ array[offset+1] = (char) (((value) >> 8) & 0xFF), \ array[offset+2] = (char) (((value) >> 16) & 0xFF), \ array[offset+3] = (char) (((value) >> 24) & 0xFF)) INT32 headersize, bfSize; int bits_per_pixel, cmap_entries; /* Compute colormap size and total file size */ if (cinfo->out_color_space == JCS_RGB) { if (cinfo->quantize_colors) { /* Colormapped RGB */ bits_per_pixel = 8; cmap_entries = 256; } else { /* Unquantized, full color RGB */ bits_per_pixel = 24; cmap_entries = 0; } } else { /* Grayscale output. We need to fake a 256-entry colormap. */ bits_per_pixel = 8; cmap_entries = 256; } /* File size */ headersize = 14 + 40 + cmap_entries * 4; /* Header and colormap */ bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; /* Set unused fields of header to 0 */ MEMZERO(bmpfileheader, SIZEOF(bmpfileheader)); MEMZERO(bmpinfoheader, SIZEOF(bmpinfoheader)); /* Fill the file header */ bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */ bmpfileheader[1] = 0x4D; PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */ /* we leave bfReserved1 & bfReserved2 = 0 */ PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */ /* Fill the info header (Microsoft calls this a BITMAPINFOHEADER) */ PUT_2B(bmpinfoheader, 0, 40); /* biSize */ PUT_4B(bmpinfoheader, 4, cinfo->output_width); /* biWidth */ PUT_4B(bmpinfoheader, 8, cinfo->output_height); /* biHeight */ PUT_2B(bmpinfoheader, 12, 1); /* biPlanes - must be 1 */ PUT_2B(bmpinfoheader, 14, bits_per_pixel); /* biBitCount */ /* we leave biCompression = 0, for none */ /* we leave biSizeImage = 0; this is correct for uncompressed data */ if (cinfo->density_unit == 2) { /* if have density in dots/cm, then */ PUT_4B(bmpinfoheader, 24, (INT32) (cinfo->X_density*100)); /* XPels/M */ PUT_4B(bmpinfoheader, 28, (INT32) (cinfo->Y_density*100)); /* XPels/M */ } PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */ /* we leave biClrImportant = 0 */ if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) ERREXIT(cinfo, JERR_FILE_WRITE); if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (size_t) 40) ERREXIT(cinfo, JERR_FILE_WRITE); if (cmap_entries > 0) write_colormap(cinfo, dest, cmap_entries, 4); }
write_bmp_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) { char bmpfileheader[14]; char bmpinfoheader[40]; #define PUT_2B(array,offset,value) \ (array[offset] = (char) ((value) & 0xFF), \ array[offset+1] = (char) (((value) >> 8) & 0xFF)) #define PUT_4B(array,offset,value) \ (array[offset] = (char) ((value) & 0xFF), \ array[offset+1] = (char) (((value) >> 8) & 0xFF), \ array[offset+2] = (char) (((value) >> 16) & 0xFF), \ array[offset+3] = (char) (((value) >> 24) & 0xFF)) INT32 headersize, bfSize; int bits_per_pixel, cmap_entries; if (cinfo->out_color_space == JCS_RGB) { if (cinfo->quantize_colors) { bits_per_pixel = 8; cmap_entries = 256; } else { bits_per_pixel = 24; cmap_entries = 0; } } else { bits_per_pixel = 8; cmap_entries = 256; } headersize = 14 + 40 + cmap_entries * 4; bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; MEMZERO(bmpfileheader, SIZEOF(bmpfileheader)); MEMZERO(bmpinfoheader, SIZEOF(bmpinfoheader)); bmpfileheader[0] = 0x42; bmpfileheader[1] = 0x4D; PUT_4B(bmpfileheader, 2, bfSize); PUT_4B(bmpfileheader, 10, headersize); PUT_2B(bmpinfoheader, 0, 40); PUT_4B(bmpinfoheader, 4, cinfo->output_width); PUT_4B(bmpinfoheader, 8, cinfo->output_height); PUT_2B(bmpinfoheader, 12, 1); PUT_2B(bmpinfoheader, 14, bits_per_pixel); if (cinfo->density_unit == 2) { PUT_4B(bmpinfoheader, 24, (INT32) (cinfo->X_density*100)); PUT_4B(bmpinfoheader, 28, (INT32) (cinfo->Y_density*100)); } PUT_2B(bmpinfoheader, 32, cmap_entries); if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) ERREXIT(cinfo, JERR_FILE_WRITE); if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (size_t) 40) ERREXIT(cinfo, JERR_FILE_WRITE); if (cmap_entries > 0) write_colormap(cinfo, dest, cmap_entries, 4); }