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Author Topic: TImage manipulatione  (Read 4871 times)

xinyiman

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TImage manipulatione
« on: July 28, 2016, 11:52:16 am »
hello guys, a question. There is a native library lazarus or who is cross-platform and has no external dependencies for manipulating picture contained in a TImage? I mainly serve

rotation
contrast
brightness
zoom


thank you
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1

simin_sh

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Re: TImage manipulatione
« Reply #1 on: July 28, 2016, 03:08:26 pm »
Did you test BGRABitmap? You can edit the bitmap and then assign it into the TImage.
OS Windows 10 - Lazarus 1.7 - FPC 3.1.1

xinyiman

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Re: TImage manipulatione
« Reply #2 on: July 28, 2016, 03:20:11 pm »
No, you have some examples to the functions I mentioned above?
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1

lainz

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Re: TImage manipulatione
« Reply #3 on: July 28, 2016, 05:55:39 pm »
BGRABitmap Rotate:

Code: Pascal  [Select][+][-]
  1.   Bitmap.RotateCCW;
  2.   Bitmap.RotateCW;
  3.   VerticalFlip(ARect: TRect);
  4.   HorizontalFlip(ARect: TRect);
  5.  

Zoom:

Code: Pascal  [Select][+][-]
  1. Resample(newWidth, newHeight: integer;
  2.       mode: TResampleMode = rmFineResample): TBGRACustomBitmap;

You can access the pixels this way to apply any filter you want:

Code: Pascal  [Select][+][-]
  1. // all pixels //
  2. var
  3.   i: integer;
  4.   p: PBGRAPixel;
  5. begin
  6.   p := Bitmap.Data;
  7.  
  8.   for i := Bitmap.NBPixels-1 downto 0 do
  9.   begin
  10.     p^.red := ;
  11.     p^.green := ;
  12.     p^.blue := ;
  13.     p^.alpha := ;
  14.     Inc(p);
  15.   end;

Code: Pascal  [Select][+][-]
  1. // scan line //
  2. var
  3.   x, y: integer;
  4.   p: PBGRAPixel;
  5. begin
  6.   for y := 0 to Bitmap.Height - 1 do
  7.   begin
  8.     p := Bitmap.Scanline[y];
  9.     for x := 0 to Bitmap.Width - 1 do
  10.     begin
  11.       p^.red := ;
  12.       p^.green := ;
  13.       p^.blue := ;
  14.       p^.alpha := ;
  15.       Inc(p);
  16.     end;
  17.   end;
  18.   Bitmap.InvalidateBitmap;

xinyiman

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Re: TImage manipulatione
« Reply #4 on: July 28, 2016, 06:25:36 pm »
But BGRABitmap run on Mac OSX?!
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1

lainz

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Re: TImage manipulatione
« Reply #5 on: July 28, 2016, 07:01:20 pm »
But BGRABitmap run on Mac OSX?!

Yes

Quote
                                bgrabitmap.pas
                                --------------
                 Free easy-to-use memory bitmap 32-bit,
                 8-bit for each channel, transparency.
                 Channels can be in the following orders:
                 - B G R A (recommended for Windows, required for fpGUI)
                 - R G B A (recommended for Gtk and MacOS

xinyiman

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Re: TImage manipulatione
« Reply #6 on: July 28, 2016, 10:43:56 pm »
Ok, it works on window. Then in the next few days I try on linux and mac. Now I wanted to understand how to manage the brightness and contrast of the image.
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1

xinyiman

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Re: TImage manipulatione
« Reply #7 on: July 28, 2016, 10:56:41 pm »
on linux I have the following problem when you compile the source. Why? How do you solve?

Code: Pascal  [Select][+][-]
  1. function TBGRASVG.GetViewBox(AUnit: TCSSUnit): TSVGViewBox;
  2. begin
  3.   with ViewBox do
  4.   begin
  5.     result.min := FUnits.ConvertCoord(min,cuCustom,AUnit);
  6.     result.size := FUnits.ConvertCoord(size,cuCustom,AUnit);
  7.   end;
  8. end;
  9.  

Messaggi, avvertimenti: 1
Warning: other unit files search path (aka unit path) of "project1" contains "/home/francesco/Documenti/Lazarus_Componenti/bgrabitmap9.1", which belongs to package "BGRABitmapPack"
Compile package BGRABitmapPack 9.1: Codice di uscita 256, Errori: 1
bgrasvg.pas(346,8) Error: Internal error 2012090607
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1

lainz

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Re: TImage manipulatione
« Reply #8 on: July 28, 2016, 11:39:48 pm »
I dont know. Try reporting it in the bgrabitmap subforum.

circular

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Re: TImage manipulatione
« Reply #9 on: July 29, 2016, 04:13:20 pm »
« Last Edit: July 29, 2016, 04:16:07 pm by circular »
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