need fast access to jBitmap byte array of pixels using ScanLine
lazarus / 43-Android

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neuro · 2021-07-01 12:38

I need fast access to jBitmap byte array of pixels (reading and
writing) using ScanLine or similar procedure.
The only way which I have found to access image pixels –> jCanvas has
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
DrawPoint(_x1: single; _y1: single);which is very slow.

In file “Laz_And_Controls.pas” I have found that jBitmap has ScanPixel
procedure which however is not implemented yet.
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
ScanPixel(PBytePixel: PScanByte; notByteIndex: integer); overload;
//TODO - just draftprocedure ScanPixel(PDWordPixel: PScanLine);
overload; //TODO - just draft
My question: how to get fast access to jBitmap byte array of pixels
using ScanLine or similar procedure?

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neuro · 2022-03-10 00:28

I have solved the problem of fast access to jBitmap pixels using
BGRABitmap.
Please read:
https://forum.lazarus.freepascal.org/index.php/topic,58624.0.html
BGRABitmap for Android demo provides fast pixel access for jBitmap

It contains attachment "AppBGRABitmapDemo1.zip".