HICON to Texture

[Acki]

Hi,
I have loaded an icon (HICON) and want to create a texture out of it...
unfortunately I have no clue how to achive this...

has someone an idea how to do this ???
(with Irrlicht 1.4.2 and WinXP)

[bitplane]

I guess you'd use DrawIconEx to draw it into a render target texture. Or you could use GetIconInfo to get the raw bitmap data, then copy that to an image - but you'd need to convert it from a colour key to a true-colour image and copy the mask bits into the alpha channel.

[Acki]

I guess you'd use DrawIconEx to draw it into a render target texture.

no clue how to use it with an ITexture or IImage...

Or you could use GetIconInfo to get the raw bitmap data, then copy that to an image

I was experimenting with this, but got only distorted garphics datas so far...
like this, the small color pixled rect should be the icon (16x16):

but you'd need to convert it from a colour key to a true-colour image and copy the mask bits into the alpha channel.

this seems to be the problem I have...
I'll try it again and search the web for infos...
if someone has a solution to this, let me know...

[bitplane]

Hmm thinking about this some more, it would make more sense to write some code to extract the bitmaps directly from the .ico file, write them into ram as a file and then pass them to Irrlicht's bitmap loader-
http://msdn.microsoft.com/en-us/library/ms997538.aspx

If the bitmap loader doesn't like 1, 4 or 8 bit images (I've never tried it and I'm not at a dev PC at the moment) then patch the code into there instead

[Acki]

Hmm thinking about this some more, it would make more sense to write some code to extract the bitmaps directly from the .ico file, write them into ram as a file and then pass them to Irrlicht's bitmap loader-
http://msdn.microsoft.com/en-us/library/ms997538.aspx

hmm, interesting approach...
unfortunately I don't have an icon file, I'm trying to get the icon assotiated with a file, this could be any file...

this is the code I have so far:

Code: Select all

#include <irrlicht.h>
#include <windows.h>

using namespace irr;
using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;

static const int icoLarge = 256;
static const int icoSmall = 257;

ITexture* getFileIcon(char* filename, int size, IVideoDriver* driver){
  ITexture* ret = 0;
  SHFILEINFO sfi;
  SHGetFileInfo(filename, 0, &sfi, sizeof(SHFILEINFO), size);
  ICONINFO  icodat;
  if(GetIconInfo(sfi.hIcon, &icodat)){
    dimension2d<s32> icoSize = dimension2d<s32>(16,16);
    if(size == icoLarge) icoSize = dimension2d<s32>(32,32);

    // tried with all possible color formats (ECF_A1R5G5B5, ECF_R5G6B5, ECF_R8G8B8 and ECF_A8R8G8B8)
    IImage* txt = driver->createImageFromData(ECF_A1R5G5B5, icoSize, &icodat.hbmColor);

    stringc icn = filename;
    icn += size;
    ret = driver->addTexture(icn.c_str(), txt);
    txt->drop();
  }
  return ret;
}

int main(){
	IrrlichtDevice *device = createDevice(EDT_DIRECT3D9, dimension2d<s32>(640, 480), 16, false, false, false, 0);
	IVideoDriver* driver = device->getVideoDriver();

  // be aware it only works with back slashes, not with forward slashes !!!
  ITexture* txt1 = getFileIcon("C:\\Programme\\CodeStuff\\Starter\\Starter.exe", icoSmall, driver);
  ITexture* txt2 = getFileIcon("C:\\Programme\\CodeStuff\\Starter\\Starter.exe", icoLarge, driver);

	while(device->run()){
		driver->beginScene(true, true, video::SColor(0,0,0,0));
		driver->draw2DImage(txt1, position2d<s32>(100,100));
		driver->draw2DImage(txt2, position2d<s32>(150,100));
		driver->endScene();
	}
	device->drop();
	return 0;
}

[RoBaTte]

The thread is some month old, but maybe someone has still to solve the same problem. I had to

Here is my working code:

Code: Select all

void getIconTexture( const char* name, HICON icon)
{
    HDC hdc = GetDC( NULL);
    PICONINFO iconInfo;
    BITMAP bmpInfo;

    GetIconInfo( icon, iconInfo);
    GetObject( iconInfo->hbmColor, sizeof( bmpInfo), &bmpInfo);

    ITexture* texture = driver->addTexture( core::dimension2di(bmpInfo.bmWidth, bmpInfo.bmHeight), name);
    void* pTexPixel = texture->lock();

    BITMAPINFO lBitmapInfo;
    ZeroMemory(&lBitmapInfo, sizeof(BITMAPINFO));
    lBitmapInfo.bmiHeader.biSize  = sizeof(BITMAPINFOHEADER);
    lBitmapInfo.bmiHeader.biWidth    = bmpInfo.bmWidth;
    lBitmapInfo.bmiHeader.biHeight   = bmpInfo.bmHeight*-1;
    lBitmapInfo.bmiHeader.biPlanes   = 1;
    lBitmapInfo.bmiHeader.biBitCount = bmpInfo.bmBitsPixel;

    GetDIBits(hdc, iconInfo->hbmColor, 0, bmpInfo.bmHeight, pTexPixel, &lBitmapInfo, DIB_RGB_COLORS);
    texture->unlock();
    DeleteDC( hdc);
}

I still have to check it, but this code assumes that Irrlicht never will create a texture with the same name twice. I it still does, you have to check if the texture with this name already exists.

Using:

Code: Select all

HICON icon = LoadIcon (NULL, IDI_QUESTION); //Get your icon 
getIconTexture( "myIconTexture_1", icon);
...
node->setMaterialTexture(0, driver->getTexture("myIconTexture_1"));
node->setMaterialType(video::EMT_TRANSPARENT_ADD_COLOR);

have fun. Rob