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Author
Topic: Searching for Bitmap.Pixels (Read 3120 times)
Systrex
Newbie
Posts: 1
Searching for Bitmap.Pixels
«
on:
December 07, 2016, 10:22:29 pm »
Hey,
In Delphi I could create a TBitmap, use LoadFromFile and then read the pixels with Bitmap.Canvas.Pixel. How can I do that in lazarus because I cant use TBitmap.create LoadFromFile etc.
Thanks in advance
Logged
lainz
Hero Member
Posts: 4460
Re: Searching for Bitmap.Pixels
«
Reply #1 on:
December 07, 2016, 11:10:49 pm »
You can use TBGRABitmap, and you can load a bitmap and access pixels with it.
http://wiki.freepascal.org/BGRABitmap_tutorial
Logged
https://lainz.github.io/
wp
Hero Member
Posts: 11858
Re: Searching for Bitmap.Pixels
«
Reply #2 on:
December 07, 2016, 11:27:52 pm »
It should work like in Delphi:
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
var
bmp
:
TBitmap
;
i
,
j
:
Integer
;
counter
:
Integer
;
begin
bmp
:
=
TBitmap
.
Create
;
try
bmp
.
LoadFromFile
(
name_of_your_bitmap_file
)
;
counter
:
=
0
;
for
j
:
=
0
to
bmp
.
Height
-
1
do
for
i
:
=
0
to
bmp
.
Width
-
1
do
if
bmp
.
Canvas
.
Pixels
[
i
,
j
]
=
clSilver
then
inc
(
Counter
)
;
ShowMessage
(
IntToStr
(
counter
)
+
' pixels in color clSilver detected'
)
;
finally
bmp
.
Free
;
end
;
end
;
Logged
lainz
Hero Member
Posts: 4460
Re: Searching for Bitmap.Pixels
«
Reply #3 on:
December 08, 2016, 12:49:25 am »
Nice wp! Im used to work with alpha in bgrabitmap that I forget to use the bitmap that comes with the lcl.
Logged
https://lainz.github.io/
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