Image format in HBitmap

[wile64]

Hello,

How are to store the images in HBitmap of TBitmap?
In what format?

[antonio]

You create a bitmap (format: bitmap) at run time, set height and width and you can load from file, save to file, etc, or simply draw or write to it.

[wile64]

I can use a bitmap, thank you !

My question is, Which is the format of the data in HBitmap :!:

ex :
header, Image Data (rgb, bgr, rgba...) ?   :?:

[antonio]

I found this link: http://www.fortunecity.com/skyscraper/windows/364/bmpffrmt.html , have a look at it.

[wile64]

thank you,

I seek information on pointer of data HBITMAP not on the files Bitmap (bmp)

[antonio]

You could search on MSDN, http://msdn2.microsoft.com/fr-fr/default.aspx

[Marc]

That info will be only for real HBITMAP handles returned by windows. There is no guarantee what so ever that it is compatible with lazarus.
A handle is an abstract pointer so some object. How it is internally structured is of no importance to a user of that handle.

[wile64]

How to reach directly the data image in TBitmap ?  :twisted:

[theo]

You can access individual Pixels using TLazIntfImage.
See http://wiki.lazarus.freepascal.org/Developing_with_Graphics#A_fading_example .

[Marc]

What data do you mean ?

[wile64]

it seems to me:
an image is to charge by the SetHandles procedure in FHandle

[Marc]

the Handle of a TBitmap is only a "utility" for the LCL to communicate with the Widgetset. For normal usage you don't need to worry about it (like every other handle)
If you want to draw something, create a TBitmap, set its Width/Height and start drawing using a canvas.
If you want to load an image, use LoadFrom... functions.
If you want a TBitmap to display on a form, put a TImage on a form, and assign its picture property.
If you want the RawImagedata, use a TLazIntfImage.GetRawImage

This is why I ask what you want to do with the handle.

[wile64]

Thank Marc,

In me classes :

TFPReaderPCX = class (TFPCustomImageReader)

procedure InternalRead  (Stream:TStream; Img:TFPCustomImage); override;

Or go my image after on load in Img ?

[Marc]

the imagereaders are used by FPImage (or LazIntfImage). For each pixel, FPImage.Setpixel is called. LazIntfImage writes those to memory, which you can retrieve/access using a rawimage.
This is internally used by bitmap to load some graphic formats.

[wile64]

Hello Marc,

I have to create units of loading of file image pass from there by from TFPCustomImageReader and TFPCustomImagewriter.

My question is to know if I can charge of the images more directly ?

One can like Delphi with scanline and of being able to reach it for the modifiers.

It also seems to to me that the pallets are not to support ?