slowATthought
Programmer
I need to be able to fade an image to any color in Direct Draw. Any help is.... um.... helpful.
Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations strongm on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
image fading in Direct Draw 7 2
- Thread starter slowATthought
- Start date
- Status
Check out this book...
I belive it will contain all the information you want and so much more.
Good Luck
I belive it will contain all the information you want and so much more.
Good Luck
-
1
- #3
We know from thread222-739521 that slowATthought already has this book.
Now, as to as to fading an image to a particular color, I'm pretty certain I dropped in an example I put together on how to quickly convert an image to grayscale using DirectDraw which might help point the way (without being a fully worked solution to this particular problem). Trouble is that I can't find the thread right now, neither am I at my normal PC so I don't have access to any of my code libraries.
Now, as to as to fading an image to a particular color, I'm pretty certain I dropped in an example I put together on how to quickly convert an image to grayscale using DirectDraw which might help point the way (without being a fully worked solution to this particular problem). Trouble is that I can't find the thread right now, neither am I at my normal PC so I don't have access to any of my code libraries.
- Thread starter
- #4
slowATthought
Programmer
Yes, thanks for the reminder, strongm!
Hmm... Well, I have plenty of time, so if you do when you do get to your computer, maybe you can help.
Hmm... Well, I have plenty of time, so if you do when you do get to your computer, maybe you can help.
), and thanks for the reminder strongm.- Thread starter
- #7
slowATthought
Programmer
No problem vb5prgrmr.
Strongm, I have heard about BltFx, but the book I have does not explain it. Could you tell me what i would need to do an alpha blend?
Thanks.
Strongm, I have heard about BltFx, but the book I have does not explain it. Could you tell me what i would need to do an alpha blend?
Thanks.
Look up alphablend in Search on this forum. You'll find
thread222-579829
thread222-520827
thread222-704818
amongst others. You will find a lot of smart code from strongm on this site, and looking up his old stuff will give him time to answer new questions for us all!
________________________________________________________________
If you want to get the best response to a question, please check out FAQ222-2244 first
'If we're supposed to work in Hex, why have we only got A fingers?'
thread222-579829
thread222-520827
thread222-704818
amongst others. You will find a lot of smart code from strongm on this site, and looking up his old stuff will give him time to answer new questions for us all!
________________________________________________________________
If you want to get the best response to a question, please check out FAQ222-2244 first
'If we're supposed to work in Hex, why have we only got A fingers?'
- Thread starter
- #9
slowATthought
Programmer
Thanks for all of the links, but I believe they relate to AlphBlend on an picture box. Remember that I am trying to do it in DX with the BltFx function. Are they similar? I just need to add a tint (probably black) to an image.
- Thread starter
- #10
slowATthought
Programmer
To update, I created a DDBLTFX object and the BltFx routine. All I need is the code before the blt that defines what it will do.
- Thread starter
- #11
- Thread starter
- #12
Yes, but I haven't had time to write any code - plus you've more-or-less figured it out for yourself, perhaps without realising it.
You need your original image on a DD7 surface, and another image of the same size that is just a block of the color you want to fade to, which should be easy to create (actually, you might get away with just having a color image of 1 pixel in size an be able to stretch it; haven't checked if we can do a strecth whilst doing BltFx). Then repeatedly alphablend the two images, slowy adding more and more of the color image
You need your original image on a DD7 surface, and another image of the same size that is just a block of the color you want to fade to, which should be easy to create (actually, you might get away with just having a color image of 1 pixel in size an be able to stretch it; haven't checked if we can do a strecth whilst doing BltFx). Then repeatedly alphablend the two images, slowy adding more and more of the color image
- Thread starter
- #14
slowATthought
Programmer
Sorry for the repeated posts. The post had left the first page, and I wasn't sure if you knew I hadn't completely solved it yet.
I created a surface to use as the color, and made it black. I am guessing that there is a property in the DDBLTFX object that I need to change to make fade between them, but I they all seem the same to me. I tried fiddling around with a few with no results. I think I can work without full code, in case you know what property I should use (which you probably do, of course!) Thanks for any help in advance.
I created a surface to use as the color, and made it black. I am guessing that there is a property in the DDBLTFX object that I need to change to make fade between them, but I they all seem the same to me. I tried fiddling around with a few with no results. I think I can work without full code, in case you know what property I should use (which you probably do, of course!) Thanks for any help in advance.
- Thread starter
- #15
slowATthought
Programmer
Bump. I don't know how to alphablend, strongm.
- Thread starter
- #17
-
1
- #18
Check out for some interesting tutorials
![[fish]](/data/assets/smilies/fish.gif "[fish] [fish]")
No Dolphins were harmed in the posting of this message... Dolphin Friendly Tuna!
Ever feel like you're banging your head against a tree? I did, so I cut down the tree.
No Dolphins were harmed in the posting of this message... Dolphin Friendly Tuna! Ever feel like you're banging your head against a tree? I did, so I cut down the tree.
Hey slowATthought, have you looked anywhere else for help on this subject? It seems like you are depending entirely on strongm. I bet you $10 there are lots of places on the internet which tell you how to do an alphablend. Just use !
Actually, it's trickier than I thought in DirectDraw - mainly because DirectDraw does not actually support alphablending (it is unimplemented). You have to use a bit of Direct3D and textures to get away with it.
So, if you are going to have to use a different component anyway, why not use GDI's built-in AlphaBlend function? Sure, you will not be able to use it on NT4 - but then you won't really be able to use DirectDraw on NT4 either...
So, if you are going to have to use a different component anyway, why not use GDI's built-in AlphaBlend function? Sure, you will not be able to use it on NT4 - but then you won't really be able to use DirectDraw on NT4 either...
- Status
Similar threads
