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ElectroFusion
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 Posted: Tue Dec 30, 2008 10:02 pm Post subject: using GetPixel? |
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Editted the last question out.. Um, what does it return? I realize it returns RGB but is it like rgb.red rgb.blue rgb.green or what?
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hcavolsdsadgadsg
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| Posted: Tue Dec 30, 2008 10:15 pm Post subject: |
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look this shit up on MSDN.
| Quote: |
COLORREF GetPixel(
HDC hdc, // handle to DC
int nXPos, // x-coordinate of pixel
int nYPos // y-coordinate of pixel
);
Return Values
The return value is the RGB value of the pixel. If the pixel is outside of the current clipping region, the return value is CLR_INVALID. |
it returns COLORREF, which is just a DWORD.
http://msdn.microsoft.com/en-us/library/ms532645(VS.85).aspx
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ElectroFusion
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| Posted: Tue Dec 30, 2008 10:20 pm Post subject: |
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I removed my last question because I realized...
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Snootae
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| Posted: Tue Dec 30, 2008 10:20 pm Post subject: |
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it returns COLORREF
so
Here
it says how to get the RGB values individually
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ElectroFusion
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| Posted: Tue Dec 30, 2008 10:26 pm Post subject: |
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thanks snootae, for not being a slovach.
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Overload
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| Posted: Wed Dec 31, 2008 12:21 am Post subject: |
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| ElectroFusion wrote: | | thanks snootae, for not being a slovach. |
You should try not being an ElectroFusion sometime. It's really great. It's like being "stupid-free"
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Heartless
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| Posted: Wed Dec 31, 2008 10:56 am Post subject: |
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| Code: | int Red, Blue, Green;
COLORREF Color;
Color = GetPixel(hdc, 0, 0);
Red = GetRValue(Color);
Blue = GetBValue(Color);
Green = GetGValue(Color); |
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samuri25404
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| Posted: Thu Jan 01, 2009 4:17 pm Post subject: |
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| HornyAZNBoy wrote: | | Code: | int Red, Blue, Green;
COLORREF Color;
Color = GetPixel(hdc, 0, 0);
Red = GetRValue(Color);
Blue = GetBValue(Color);
Green = GetGValue(Color); |
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| Code: |
int R, B, G;
R = ( Color & 0x000000ff );
B = ( ( Color & 0x0000ff00 ) >> 2 );
G = ( ( Color & 0x00ff0000 ) >> 4 );
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Correct?
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lurc
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| Posted: Thu Jan 01, 2009 4:18 pm Post subject: |
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I believe its shift right 8 bits and 16 bits not 2 and 4.
Edit:
Here's the definitions right from WinGDI.h
| Code: | #define GetRValue(rgb) (LOBYTE(rgb))
#define GetGValue(rgb) (LOBYTE(((WORD)(rgb)) >> 8))
#define GetBValue(rgb) (LOBYTE((rgb)>>16)) |
LOBYTE is just & 0xFF
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