Re: [lazarus] scanline example didn't work after update to svn 12247
Mattias Gaertner rašė: The LCL TBitmap has no ScanLine property, because under Delphi its only purpose is fast direct access and this is not possible under all LCL platforms. But there is an alternative, which can be used in most cases. See lazarus/examples/scanline/. In file unit.pas of that example is written: // fill line with gray for i:=0 to (ImgWidth*4)-1 do PByte(LineStart)[i]:=0; // set red, green and blue to 128 (i.e. gray) I think in comments and in other places should be word black not gray or value should be PByte...:=128 not 0... -- Valdas Jankūnas _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
Re: [lazarus] scanline example didn't work after update to svn 12247
On Thu, 04 Oct 2007 12:12:29 +0300 Valdas Jankūnas [EMAIL PROTECTED] wrote: Mattias Gaertner rašė: The LCL TBitmap has no ScanLine property, because under Delphi its only purpose is fast direct access and this is not possible under all LCL platforms. But there is an alternative, which can be used in most cases. See lazarus/examples/scanline/. In file unit.pas of that example is written: // fill line with gray for i:=0 to (ImgWidth*4)-1 do PByte(LineStart)[i]:=0; // set red, green and blue to 128 (i.e. gray) I think in comments and in other places should be word black not gray or value should be PByte...:=128 not 0... Thanks for the hint. Fixed. Mattias _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
Re: [lazarus] scanline example didn't work after update to svn 12247
Hi Mattias, which build of Lazarus is this available in? Because on the version I have, Tbitmaps don't have the scanline property. Dominique. Mattias Gaertner wrote: On Tue, 02 Oct 2007 22:32:21 +0100 Dominique Louis [EMAIL PROTECTED] wrote: Will this Scanline code also work on Mac OS X? intel/32bit: of course. powerpc, intel/64bit: sometimes. It depends, what tricks your code use. The only guaranteed platform independent way are the functions of TCanvas. Mattias Dominique. 12 12 wrote: It means, the function does not work with formats which lines can start in a middle of a byte (e.g. at the third bit). The Delphi ScanLine function has the same limit. I didn't know about such formats! Which formats can start in a middle of a byte? -- _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
Re: [lazarus] scanline example didn't work after update to svn 12247
Will this Scanline code also work on Mac OS X? Dominique. 12 12 wrote: It means, the function does not work with formats which lines can start in a middle of a byte (e.g. at the third bit). The Delphi ScanLine function has the same limit. I didn't know about such formats! Which formats can start in a middle of a byte? -- 12 12 aka skywriter _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
Re: [lazarus] scanline example didn't work after update to svn 12247
On Tue, 02 Oct 2007 22:32:21 +0100 Dominique Louis [EMAIL PROTECTED] wrote: Will this Scanline code also work on Mac OS X? intel/32bit: of course. powerpc, intel/64bit: sometimes. It depends, what tricks your code use. The only guaranteed platform independent way are the functions of TCanvas. Mattias Dominique. 12 12 wrote: It means, the function does not work with formats which lines can start in a middle of a byte (e.g. at the third bit). The Delphi ScanLine function has the same limit. I didn't know about such formats! Which formats can start in a middle of a byte? -- 12 12 aka skywriter _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
Re: [lazarus] scanline example didn't work after update to svn 12247
On Sun, 30 Sep 2007 08:54:14 +0400 12 12 [EMAIL PROTECTED] wrote: Subj. It tells: Unit1.pas(80,17) Error: identifier idents no member Set_BPP32_B8G8R8_A1_BIO_TTB Unit1.pas(80,44) Error: Illegal expression Unit1.pas(80,44) Fatal: Syntax error, ; expected but ( found This function is undocumented in help so it is not obvious how to replaced it. Updated and fixed. And what means this line in intfgraphics.pas: function GetDataLineStart(y: integer): Pointer;// similar to Delphi TBitmap.ScanLine. Only works with byte aligned lines. What means Only works with byte aligned lines ? How it differs from Delphi's one? It means, the function does not work with formats which lines can start in a middle of a byte (e.g. at the third bit). The Delphi ScanLine function has the same limit. Mattias _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
Re: [lazarus] scanline example didn't work after update to svn 12247
It means, the function does not work with formats which lines can start in a middle of a byte (e.g. at the third bit). The Delphi ScanLine function has the same limit. I didn't know about such formats! Which formats can start in a middle of a byte? -- 12 12 aka skywriter _ To unsubscribe: mail [EMAIL PROTECTED] with unsubscribe as the Subject archives at http://www.lazarus.freepascal.org/mailarchives
