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@@ -1,3 +1,8 @@
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+{$IFDEF FPC}
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+{$MODE DELPHI}
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+{$GOTO ON}
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+{$DEFINE DELPHI_STREAM}
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+{$ENDIF}
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Unit example;
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{ This file illustrates how to use the IJG code as a subroutine library
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@@ -37,6 +42,10 @@ function read_JPEG_file (filename : string) : boolean;
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implementation
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+{$ifdef delphi_stream}
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+ uses
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+ Classes;
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+{$endif delphi_stream}
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{ <setjmp.h> is used for the optional error recovery mechanism shown in
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the second part of the example. }
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@@ -93,7 +102,11 @@ var
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jerr : jpeg_error_mgr;
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{ More stuff }
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+{$ifdef delphi_stream}
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+ outfile : TFileStream;
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+{$else delphi_stream}
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outfile : FILE; { target file }
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+{$endif delphi_stream}
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row_pointer : array[0..0] of JSAMPROW ; { pointer to JSAMPLE row[s] }
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row_stride : int; { physical row width in image buffer }
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begin
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@@ -117,7 +130,9 @@ begin
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stdio stream. You can also write your own code to do something else.
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VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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requires it in order to write binary files. }
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-
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+{$ifdef delphi_stream}
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+ outfile := TFileStream.Create(filename, fmCreate);
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+{$else delphi_stream}
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Assign(outfile, filename);
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{$push}{$I-}
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ReWrite(outfile, 1);
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@@ -127,6 +142,7 @@ begin
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WriteLn(output, 'can''t open ', filename);
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Halt(1);
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end;
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+{$endif delphi_stream}
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jpeg_stdio_dest(@cinfo, @outfile);
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{ Step 3: set parameters for compression }
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@@ -179,7 +195,11 @@ begin
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jpeg_finish_compress(@cinfo);
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{ After finish_compress, we can close the output file. }
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+{$ifdef delphi_stream}
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+ outfile.Free;
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+{$else delphi_stream}
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system.close(outfile);
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+{$endif delphi_stream}
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{ Step 7: release JPEG compression object }
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@@ -321,7 +341,11 @@ var
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jerr : my_error_mgr;
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{ More stuff }
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- infile : FILE; { source file }
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+{$ifdef delphi_stream}
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+ infile : TFileStream;
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+{$else delphi_stream}
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+ infile : FILE; { target file }
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+{$endif delphi_stream}
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buffer : JSAMPARRAY; { Output row buffer }
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row_stride : int; { physical row width in output buffer }
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begin
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@@ -331,6 +355,9 @@ begin
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VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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requires it in order to read binary files. }
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+{$ifdef delphi_stream}
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+ infile := TFileStream.Create(filename, fmOpenRead);
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+{$else delphi_stream}
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Assign(infile, filename);
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{$push}{$I-}
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Reset(infile, 1);
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@@ -341,6 +368,7 @@ begin
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read_JPEG_file := FALSE;
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exit;
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end;
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+{$endif delphi_stream}
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{ Step 1: allocate and initialize JPEG decompression object }
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@@ -356,7 +384,11 @@ begin
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{ Nomssi: if we get here, we are in trouble, because e.g. cinfo.mem
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is not guaranted to be NIL }
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jpeg_destroy_decompress(@cinfo);
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+{$ifdef delphi_stream}
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+ infile.Free;
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+{$else delphi_stream}
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system.close(infile);
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+{$endif delphi_stream}
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read_JPEG_file := FALSE;
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exit;
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end;
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@@ -440,7 +472,11 @@ begin
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Here we postpone it until after no more JPEG errors are possible,
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so as to simplify the setjmp error logic above. (Actually, I don't
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think that jpeg_destroy can do an error exit, but why assume anything...) }
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+{$ifdef delphi_stream}
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+ infile.Free;
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+{$else delphi_stream}
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system.close(infile);
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+{$endif delphi_stream}
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{ At this point you may want to check to see whether any corrupt-data
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warnings occurred (test whether jerr.pub.num_warnings is nonzero). }
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florian