Unit wrbmp; { Copyright (C) 1994-1996, Thomas G. Lane. This code contributed by James Arthur Boucher. This file contains routines to write output images in Microsoft "BMP" format (MS Windows 3.x and OS/2 1.x flavors). Either 8-bit colormapped or 24-bit full-color format can be written. No compression is supported. } interface {$I jconfig.inc} uses jmorecfg, jpeglib, jinclude, jdeferr, jerror, jdmaster, cdjpeg; { Common decls for cjpeg/djpeg applications } { The module selection routine for BMP format output. } {GLOBAL} function jinit_write_bmp (cinfo : j_decompress_ptr; is_os2 : boolean) : djpeg_dest_ptr; implementation { To support 12-bit JPEG data, we'd have to scale output down to 8 bits. This is not yet implemented. } {$ifndef BITS_IN_JSAMPLE_IS_8} Sorry, this code only copes with 8-bit JSAMPLEs. { deliberate syntax err } {$endif} { Since BMP stores scanlines bottom-to-top, we have to invert the image from JPEG's top-to-bottom order. To do this, we save the outgoing data in a virtual array during put_pixel_row calls, then actually emit the BMP file during finish_output. The virtual array contains one JSAMPLE per pixel if the output is grayscale or colormapped, three if it is full color.} { Private version of data destination object } type bmp_dest_ptr = ^bmp_dest_struct; bmp_dest_struct = record pub : djpeg_dest_struct; { public fields } is_os2 : boolean; { saves the OS2 format request flag } whole_image : jvirt_sarray_ptr; { needed to reverse row order } data_width : JDIMENSION; { JSAMPLEs per row } row_width : JDIMENSION; { physical width of one row in the BMP file } pad_bytes : int; { number of padding bytes needed per row } cur_output_row : JDIMENSION; { next row# to write to virtual array } end; { Forward declarations } {LOCAL} procedure write_colormap(cinfo : j_decompress_ptr; dest : bmp_dest_ptr; map_colors : int; map_entry_size : int); forward; { Write some pixel data. In this module rows_supplied will always be 1. } {METHODDEF} procedure put_pixel_rows (cinfo : j_decompress_ptr; dinfo : djpeg_dest_ptr; rows_supplied : JDIMENSION); far; { This version is for writing 24-bit pixels } var dest : bmp_dest_ptr; image_ptr : JSAMPARRAY; {register} inptr : JSAMPLE_PTR; outptr : BGRptr; {register} col : JDIMENSION; pad : int; begin dest := bmp_dest_ptr (dinfo); { Access next row in virtual array } image_ptr := cinfo^.mem^.access_virt_sarray (j_common_ptr(cinfo), dest^.whole_image, dest^.cur_output_row, JDIMENSION (1), TRUE); Inc(dest^.cur_output_row); { Transfer data. Note destination values must be in BGR order (even though Microsoft's own documents say the opposite). } inptr := JSAMPLE_PTR(dest^.pub.buffer^[0]); outptr := BGRptr(image_ptr^[0]); for col := pred(cinfo^.output_width) downto 0 do begin outptr^.r := inptr^; { can omit GETJSAMPLE() safely } Inc(inptr); outptr^.g := inptr^; Inc(inptr); outptr^.b := inptr^; Inc(inptr); Inc(outptr); end; { Zero out the pad bytes. } pad := dest^.pad_bytes; while (pad > 0) do begin Dec(pad); JSAMPLE_PTR(outptr)^ := 0; Inc(JSAMPLE_PTR(outptr)); end; end; {METHODDEF} procedure put_gray_rows (cinfo : j_decompress_ptr; dinfo : djpeg_dest_ptr; rows_supplied : JDIMENSION); far; { This version is for grayscale OR quantized color output } var dest : bmp_dest_ptr; image_ptr : JSAMPARRAY; {register} inptr, outptr : JSAMPLE_PTR; {register} col : JDIMENSION; pad : int; begin dest := bmp_dest_ptr (dinfo); { Access next row in virtual array } image_ptr := cinfo^.mem^.access_virt_sarray (j_common_ptr(cinfo), dest^.whole_image, dest^.cur_output_row, JDIMENSION (1), TRUE); Inc(dest^.cur_output_row); { Transfer data. } inptr := JSAMPLE_PTR(dest^.pub.buffer^[0]); outptr := JSAMPLE_PTR(image_ptr^[0]); for col := pred(cinfo^.output_width) downto 0 do begin outptr^ := inptr^; { can omit GETJSAMPLE() safely } Inc(outptr); Inc(inptr); end; { Zero out the pad bytes. } pad := dest^.pad_bytes; while (pad > 0) do begin Dec(pad); outptr^ := 0; Inc(outptr); end; end; { Startup: normally writes the file header. In this module we may as well postpone everything until finish_output. } {METHODDEF} procedure start_output_bmp (cinfo : j_decompress_ptr; dinfo : djpeg_dest_ptr); far; begin { no work here } end; { Finish up at the end of the file. Here is where we really output the BMP file. First, routines to write the Windows and OS/2 variants of the file header. } {LOCAL} procedure write_bmp_header (cinfo : j_decompress_ptr; dest : bmp_dest_ptr); { Write a Windows-style BMP file header, including colormap if needed } var bmpfileheader : packed array[0..14-1] of byte; bmpinfoheader : packed array[0..40-1] of byte; var headersize, bfSize : INT32 ; bits_per_pixel, cmap_entries : int; begin { Compute colormap size and total file size } if (cinfo^.out_color_space = JCS_RGB) then begin if (cinfo^.quantize_colors) then begin { Colormapped RGB } bits_per_pixel := 8; cmap_entries := 256; end else begin { Unquantized, full color RGB } bits_per_pixel := 24; cmap_entries := 0; end; end else begin { Grayscale output. We need to fake a 256-entry colormap. } bits_per_pixel := 8; cmap_entries := 256; end; { 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] := $42; { first 2 bytes are ASCII 'B', 'M' } bmpfileheader[1] := $4D; {PUT_4B(bmpfileheader, 2, bfSize);} { bfSize } bmpfileheader[2] := byte ((bfSize) and $FF); bmpfileheader[2+1] := byte (((bfSize) shr 8) and $FF); bmpfileheader[2+2] := byte (((bfSize) shr 16) and $FF); bmpfileheader[2+3] := byte (((bfSize) shr 24) and $FF); { we leave bfReserved1 & bfReserved2 = 0 } {PUT_4B(bmpfileheader, 10, headersize);} { bfOffBits } bmpfileheader[10] := byte (headersize and $FF); bmpfileheader[10+1] := byte ((headersize shr 8) and $FF); bmpfileheader[10+2] := byte ((headersize shr 16) and $FF); bmpfileheader[10+3] := byte ((headersize shr 24) and $FF); { Fill the info header (Microsoft calls this a BITMAPINFOHEADER) } {PUT_2B(bmpinfoheader, 0, 40);} { biSize } bmpinfoheader[0] := byte ((40) and $FF); bmpinfoheader[0+1] := byte (((40) shr 8) and $FF); {PUT_4B(bmpinfoheader, 4, cinfo^.output_width);} { biWidth } bmpinfoheader[4] := byte ((cinfo^.output_width) and $FF); bmpinfoheader[4+1] := byte ((cinfo^.output_width shr 8) and $FF); bmpinfoheader[4+2] := byte ((cinfo^.output_width shr 16) and $FF); bmpinfoheader[4+3] := byte ((cinfo^.output_width shr 24) and $FF); {PUT_4B(bmpinfoheader, 8, cinfo^.output_height);} { biHeight } bmpinfoheader[8] := byte (cinfo^.output_height and $FF); bmpinfoheader[8+1] := byte ((cinfo^.output_height shr 8) and $FF); bmpinfoheader[8+2] := byte ((cinfo^.output_height shr 16) and $FF); bmpinfoheader[8+3] := byte ((cinfo^.output_height shr 24) and $FF); {PUT_2B(bmpinfoheader, 12, 1);} { biPlanes - must be 1 } bmpinfoheader[12] := byte (1 and $FF); bmpinfoheader[12+1] := byte ((1 shr 8) and $FF); {PUT_2B(bmpinfoheader, 14, bits_per_pixel);} { biBitCount } bmpinfoheader[14] := byte (bits_per_pixel and $FF); bmpinfoheader[14+1] := byte ((bits_per_pixel shr 8) and $FF); { we leave biCompression = 0, for none } { we leave biSizeImage = 0; this is correct for uncompressed data } if (cinfo^.density_unit = 2) then begin { if have density in dots/cm, then } {PUT_4B(bmpinfoheader, 24, INT32 (cinfo^.X_density*100));} { XPels/M } bmpinfoheader[24] := byte (INT32 (cinfo^.X_density*100) and $FF); bmpinfoheader[24+1] := byte ((INT32 (cinfo^.X_density*100) shr 8) and $FF); bmpinfoheader[24+2] := byte ((INT32 (cinfo^.X_density*100) shr 16) and $FF); bmpinfoheader[24+3] := byte ((INT32 (cinfo^.X_density*100) shr 24) and $FF); {PUT_4B(bmpinfoheader, 28, INT32 (cinfo^.Y_density*100));} { XPels/M } bmpinfoheader[28] := byte (INT32 (cinfo^.Y_density*100) and $FF); bmpinfoheader[28+1] := byte ((INT32 (cinfo^.Y_density*100) shr 8) and $FF); bmpinfoheader[28+2] := byte ((INT32 (cinfo^.Y_density*100) shr 16) and $FF); bmpinfoheader[28+3] := byte ((INT32 (cinfo^.Y_density*100) shr 24) and $FF); end; {PUT_2B(bmpinfoheader, 32, cmap_entries);} { biClrUsed } bmpinfoheader[32] := byte (cmap_entries and $FF); bmpinfoheader[32+1] := byte ((cmap_entries shr 8) and $FF); { we leave biClrImportant := 0 } if (JFWRITE(dest^.pub.output_file, @bmpfileheader, 14) <> size_t (14)) then ERREXIT(j_common_ptr(cinfo), JERR_FILE_WRITE); if (JFWRITE(dest^.pub.output_file, @bmpinfoheader, 40) <> size_t (40)) then ERREXIT(j_common_ptr(cinfo), JERR_FILE_WRITE); if (cmap_entries > 0) then write_colormap(cinfo, dest, cmap_entries, 4); end; {LOCAL} procedure write_os2_header (cinfo : j_decompress_ptr; dest : bmp_dest_ptr); { Write an OS2-style BMP file header, including colormap if needed } var bmpfileheader : array[0..14-1] of byte; bmpcoreheader : array[0..12-1] of byte; headersize, bfSize : INT32; bits_per_pixel, cmap_entries : int; begin { Compute colormap size and total file size } if (cinfo^.out_color_space = JCS_RGB) then begin if (cinfo^.quantize_colors) then begin { Colormapped RGB } bits_per_pixel := 8; cmap_entries := 256; end else begin { Unquantized, full color RGB } bits_per_pixel := 24; cmap_entries := 0; end; end else begin { Grayscale output. We need to fake a 256-entry colormap. } bits_per_pixel := 8; cmap_entries := 256; end; { 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] := $42; { first 2 bytes are ASCII 'B', 'M' } bmpfileheader[1] := $4D; {PUT_4B(bmpfileheader, 2, bfSize);} { bfSize } bmpfileheader[2] := byte ((bfSize) and $FF); bmpfileheader[2+1] := byte (((bfSize) shr 8) and $FF); bmpfileheader[2+2] := byte (((bfSize) shr 16) and $FF); bmpfileheader[2+3] := byte (((bfSize) shr 24) and $FF); { we leave bfReserved1 & bfReserved2 := 0 } {PUT_4B(bmpfileheader, 10, headersize);} { bfOffBits } bmpfileheader[10] := byte ((headersize) and $FF); bmpfileheader[10+1] := byte (((headersize) shr 8) and $FF); bmpfileheader[10+2] := byte (((headersize) shr 16) and $FF); bmpfileheader[10+3] := byte (((headersize) shr 24) and $FF); { Fill the info header (Microsoft calls this a BITMAPCOREHEADER) } {PUT_2B(bmpcoreheader, 0, 12);} { bcSize } bmpcoreheader[0] := byte (12 and $FF); bmpcoreheader[0+1] := byte ((12 shr 8) and $FF); {PUT_2B(bmpcoreheader, 4, cinfo^.output_width);} { bcWidth } bmpcoreheader[4] := byte (cinfo^.output_width and $FF); bmpcoreheader[4+1] := byte ((cinfo^.output_width shr 8) and $FF); {PUT_2B(bmpcoreheader, 6, cinfo^.output_height);} { bcHeight } bmpcoreheader[6] := byte (cinfo^.output_height and $FF); bmpcoreheader[6+1] := byte ((cinfo^.output_height shr 8) and $FF); {PUT_2B(bmpcoreheader, 8, 1);} { bcPlanes - must be 1 } bmpcoreheader[8] := byte (1 and $FF); bmpcoreheader[8+1] := byte ((1 shr 8) and $FF); {PUT_2B(bmpcoreheader, 10, bits_per_pixel);} { bcBitCount } bmpcoreheader[10] := byte (bits_per_pixel and $FF); bmpcoreheader[10+1] := byte ((bits_per_pixel shr 8) and $FF); if (JFWRITE(dest^.pub.output_file, @bmpfileheader, 14) <> size_t (14)) then ERREXIT(j_common_ptr(cinfo), JERR_FILE_WRITE); if (JFWRITE(dest^.pub.output_file, @bmpcoreheader, 12) <> size_t (12)) then ERREXIT(j_common_ptr(cinfo), JERR_FILE_WRITE); if (cmap_entries > 0) then write_colormap(cinfo, dest, cmap_entries, 3); end; { Write the colormap. Windows uses BGR0 map entries; OS/2 uses BGR entries. } {LOCAL} procedure write_colormap (cinfo : j_decompress_ptr; dest : bmp_dest_ptr; map_colors : int; map_entry_size : int); var colormap : JSAMPARRAY; num_colors : int; outfile : FILEptr; i : int; var output_color_map : Array[0..255] of BGRtype; output_ext_color_map : Array[0..255] of record b,g,r,a : byte; end; begin colormap := cinfo^.colormap; num_colors := cinfo^.actual_number_of_colors; outfile := dest^.pub.output_file; if (colormap <> NIL) then begin if (cinfo^.out_color_components = 3) then begin { Normal case with RGB colormap } if (map_entry_size = 4) then for i := 0 to pred(num_colors) do with output_ext_color_map[i] do begin b := GETJSAMPLE(cinfo^.colormap^[2]^[i]); g := GETJSAMPLE(cinfo^.colormap^[1]^[i]); r := GETJSAMPLE(cinfo^.colormap^[0]^[i]); a := 0; end else for i := 0 to pred(num_colors) do with output_color_map[i] do begin b := GETJSAMPLE(cinfo^.colormap^[2]^[i]); g := GETJSAMPLE(cinfo^.colormap^[1]^[i]); r := GETJSAMPLE(cinfo^.colormap^[0]^[i]); end; end else begin { Grayscale colormap (only happens with grayscale quantization) } if (map_entry_size = 4) then for i := 0 to pred(num_colors) do with output_ext_color_map[i] do begin b := GETJSAMPLE(cinfo^.colormap^[0]^[i]); g := GETJSAMPLE(cinfo^.colormap^[0]^[i]); r := GETJSAMPLE(cinfo^.colormap^[0]^[i]); a := 0; end else for i := 0 to pred(num_colors) do with output_color_map[i] do begin b := GETJSAMPLE(cinfo^.colormap^[0]^[i]); g := GETJSAMPLE(cinfo^.colormap^[0]^[i]); r := GETJSAMPLE(cinfo^.colormap^[0]^[i]); end; end; i := num_colors; end else begin { If no colormap, must be grayscale data. Generate a linear "map". } { Nomssi: do not use "num_colors" here, it should be 0 } if (map_entry_size = 4) then for i := 0 to pred(256) do with output_ext_color_map[i] do begin b := i; g := i; r := i; a := 0; end else for i := 0 to pred(256) do with output_color_map[i] do begin b := i; g := i; r := i; end; i := 256; end; { Pad colormap with zeros to ensure specified number of colormap entries } if (i > map_colors) then ERREXIT1(j_common_ptr(cinfo), JERR_TOO_MANY_COLORS, i); while (i < map_colors) do begin if (map_entry_size = 4) then with output_ext_color_map[i] do begin b := 0; g := 0; r := 0; a := 0; end else with output_color_map[i] do begin b := 0; g := 0; r := 0; end; Inc(i); end; if (map_entry_size = 4) then JFWRITE(outfile, @output_ext_color_map, map_colors*4) else JFWRITE(outfile, @output_color_map, map_colors*3); end; {METHODDEF} procedure finish_output_bmp (cinfo : j_decompress_ptr; dinfo : djpeg_dest_ptr); far; var dest : bmp_dest_ptr; {register} outfile : FILEptr; image_ptr : JSAMPARRAY; {register} data_ptr : JSAMPLE_PTR; row : JDIMENSION; {register} { col : JDIMENSION; } progress : cd_progress_ptr; begin dest := bmp_dest_ptr (dinfo); outfile := dest^.pub.output_file; progress := cd_progress_ptr (cinfo^.progress); { Write the header and colormap } if (dest^.is_os2) then write_os2_header(cinfo, dest) else write_bmp_header(cinfo, dest); { Write the file body from our virtual array } for row := cinfo^.output_height downto 1 do begin if (progress <> NIL) then begin progress^.pub.pass_counter := long (cinfo^.output_height - row); progress^.pub.pass_limit := long (cinfo^.output_height); progress^.pub.progress_monitor (j_common_ptr(cinfo)); end; image_ptr := cinfo^.mem^.access_virt_sarray (j_common_ptr(cinfo), dest^.whole_image, row-1, JDIMENSION(1), FALSE); data_ptr := JSAMPLE_PTR(image_ptr^[0]); { Nomssi - This won't work for 12bit samples } JFWRITE(outfile, data_ptr, dest^.row_width); { for col := pred(dest^.row_width) downto 0 do begin putc(GETJSAMPLE(data_ptr^), outfile); Inc(data_ptr); end; } end; if (progress <> NIL) then Inc(progress^.completed_extra_passes); { Make sure we wrote the output file OK } {fflush(outfile); if (ferror(outfile)) then ERREXIT(cinfo, JERR_FILE_WRITE);} end; { The module selection routine for BMP format output. } {GLOBAL} function jinit_write_bmp (cinfo : j_decompress_ptr; is_os2 : boolean) : djpeg_dest_ptr; var dest : bmp_dest_ptr; row_width : JDIMENSION; var progress : cd_progress_ptr; begin { Create module interface object, fill in method pointers } dest := bmp_dest_ptr ( cinfo^.mem^.alloc_small (j_common_ptr(cinfo), JPOOL_IMAGE, SIZEOF(bmp_dest_struct)) ); dest^.pub.start_output := start_output_bmp; dest^.pub.finish_output := finish_output_bmp; dest^.is_os2 := is_os2; if (cinfo^.out_color_space = JCS_GRAYSCALE) then begin dest^.pub.put_pixel_rows := put_gray_rows; end else if (cinfo^.out_color_space = JCS_RGB) then begin if (cinfo^.quantize_colors) then dest^.pub.put_pixel_rows := put_gray_rows else dest^.pub.put_pixel_rows := put_pixel_rows; end else ERREXIT(j_common_ptr(cinfo), JERR_BMP_COLORSPACE); { Calculate output image dimensions so we can allocate space } jpeg_calc_output_dimensions(cinfo); { Determine width of rows in the BMP file (padded to 4-byte boundary). } row_width := cinfo^.output_width * cinfo^.output_components; dest^.data_width := row_width; while ((row_width and 3) <> 0) do Inc(row_width); dest^.row_width := row_width; dest^.pad_bytes := int (row_width - dest^.data_width); { Allocate space for inversion array, prepare for write pass } dest^.whole_image := cinfo^.mem^.request_virt_sarray (j_common_ptr(cinfo), JPOOL_IMAGE, FALSE, row_width, cinfo^.output_height, JDIMENSION (1)); dest^.cur_output_row := 0; if (cinfo^.progress <> NIL) then begin progress := cd_progress_ptr (cinfo^.progress); Inc(progress^.total_extra_passes); { count file input as separate pass } end; { Create decompressor output buffer. } dest^.pub.buffer := cinfo^.mem^.alloc_sarray (j_common_ptr(cinfo), JPOOL_IMAGE, row_width, JDIMENSION (1)); dest^.pub.buffer_height := 1; jinit_write_bmp := djpeg_dest_ptr(dest); end; end. { BMP_SUPPORTED }