Maskimage with b+?
BlitzPlus Forums/BlitzPlus Programming/Maskimage with b+?
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| I need to mask an image with a transpareny colour. But when I draw it on screen the background is always displayed "black"... Someone told me to call a "user32.dll" to get the current window color. - Is there an easier way? Right now I have painted the image background grey so it fits the windowcolour on my PC. But thats only bad cheating... :( |
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| In graphics mode it works fine for me, but since you are talking about grey as your window color i suppose you are creating windows and gadgets? |
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| yes, exactly Here's the code I use atm for displaying the image: Global cwdb_logo=LoadImage("cwdb.png"): MaskImage cwdb_logo,0,0,0 CW_Logo=CreateCanvas(542,16,55,55,CD_window,1) SetBuffer CanvasBuffer(CW_logo) DrawImage cwdb_logo,0,0 FlipCanvas cw_logo |
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| first off loading an image black is always transparent by default so you don't need to set it as the mask colour. Second - the reason the background is black is that is the default colour for a canvas. if you draw a rect or use the clscolor along with a cls, then you can change the colour of the background. To make it the same as the desktop you need to use a userlib to get the window colour (since people can change their windows properties) To do this you use the send message command. I can't remember how to do this though, am having a look. |
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| lo Grisu it's me again. Create a file in notepad that looks something like this: .lib "user32.dll" GetSysColor%(Color%) Save it as BlitzPlus\userlibs\user32.decls Then, in your game, to get the colour of a window face.. Global winr, wing, winb winrgb=GetSysColor(5) winr = winrgb Shr 16 And $FF wing = winrgb Shr 8 And $FF winb = winrgb And $FF . . SetBuffer Canvasbuffer(can) ClsColor winr, wing, winb Cls . . |
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| More on the GetSysColor HERE Hi Cyberseth, Do you have your rgb values in the right order there? I played around with GetSysColor and found that it returned the color in BGR format. See my example in the link above. |
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| Oops I believe you're right! ;) |
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| Well, I tested Seth's example code and I now I have a white background instead of a black one. - At least some visual progress, but something is wrong with that! :)))))))))))))) @Syntax: Will check it. International Karate rocks! Anyone working on a remake??? :) |
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| International Karate rocks! Anyone working on a remake??? :) I was thinking about it.. then I found it for my GBA :P |
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| Hi, Syntax Error... did you draw the karateka animation above? I could use some (and pay) some low-resolution graphics like that. /R |
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| Grisu, change GetSysColor(5) to GetSysColor(15). Sorry about that! |
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| Try B+ 1.11 and see if you still have the same problem. I found a huge problem with B+ 1.35 NOT masking the color I tell it to on my old laptop with a 4mb graphics card (see previous post (blank full screen) wheras it works perfectly in B2D and earlier versions of B+. This is a very serious problem for distribution of software. Also try changing the graphics driver and see if that works |
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