FireMonkey TBitmap Pixels C++ Code Sample

This example shows how to use the TBitmap.Pixels property. This sample draws and fills the rectangle on an image, pixel by pixel.

To build and test this example, create a FireMonkey HD Application - C++, then add the next objects to the form:

A TImage to display the initial TBitmap.
A TImage to display the result.
Two TLabels, one for each TImage.
A TButton to draw on the initial image.
A TOpenDialog and a TButton to load the image to be customized.

Add the following code to the OnClick event handlers of the load button.

void __fastcall TForm1::Button2Click(TObject *Sender) {
	if (OpenDialog1->Execute()) {
		Image1->Bitmap->LoadFromFile(OpenDialog1->FileName);
	}
}

Add the following code to the OnClick event handlers of the other button.

void __fastcall TForm1::Button1Click(TObject *Sender) {
	TBitmap *MyBitmap = new TBitmap(0, 0);
	int X, Y;
	try {
		if (Image1->Bitmap->IsEmpty()) {
			// Display a message when there is no image loaded
			MessageDlg("There is no image to customize:",
				TMsgDlgType::mtWarning,
			TMsgDlgButtons() << TMsgDlgBtn::mbOK, 0);
		}
		else {
			// A copy of the initial bitmap
			MyBitmap->Assign(Image1->Bitmap);
			// Changes the color of certain pixels
			for (X = 20; X <= 200; X++) {
				for (Y = 10; Y <= 100; Y++) {
					MyBitmap->Pixels[X][Y] = claLime;
				}
			}
			// Display the result
			Image2->Bitmap = MyBitmap;
		}
	}
	__finally {
		delete MyBitmap;
 
	}
}

The result should look like in the following image:

FMX.Types.TBitmap.Pixels ( fr | de | ja )

FMX.ObjectsTImage.Bitmap ( fr | de | ja )

FMX.Objects.Objects.TImage ( fr | de | ja )
FMX.Dialogs.TOpenDialog( fr | de | ja )
Delphi version of this example

FireMonkey TBitmap Pixels C++ Code Sample

FMXTBitmapPixels (C++)

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