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Stretching alpha-bitmaps
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Email
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| Submitted on: |
5/8/2005 8:06:31 PM |
| By: |
Carles P.V.
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| Level: |
Intermediate |
| User Rating: |
By 28 Users |
| Compatibility: |
VB 6.0 |
| Views: |
17508 |
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Some additions: AlphaBltStrecth and AlphaBlendStretch with and without interpolation (bilinear). Thanks to Ron van Tilburg for the fast 'integer maths' version of Peter Scale's 'Bilinear resizing' routine. And about this, a note: API AlphaBlend stretches using nearest-neighbour method (it only allows COLORONCOLOR for SetStretchBltMode function). This has a simple explanation: interpolation of alpha-bitmaps involves "pre-blending" (composition) alpha-pixels before rendering onto given DC. This complicates processing. This is supposed what GDI+ solves. Attached, there is a GDI+ test project for comparison purposes (compare flower contour-pixels of both tests; increase iterations for better appreciation and use AlphaBlendStretch function). __________________________________________________ Update #1. Some effects; packed in mDIB32Ext module: 'ConvertToGrey', 'BlendWithColor' and 'ChangeGlobalAlpha'. You can add your own ones. Remember pixel data is stored as ARGB (BGRA byte array).
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Other 53 submission(s) by this author
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Other User Comments
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 5/9/2005 4:09:07 AM: Phantom Man
Only One Thing To Say - Simply Brilliant. Thanks Carles.
Regards
Gary
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5/9/2005 5:59:16 AM: GDuncan
If it says Carles P.V. next to the submission dowload it, its gauranteed to be good stuff.
One thing you missed though Charles is the GdiplusShutdown call in your gdiplus app.
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5/9/2005 7:50:48 AM: TerriTop
Very Nice! This is a very solid submission and one worth the download! 5 Balls from me...Thanks for sharing...
TerriTop
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5/9/2005 3:50:25 PM: Carles P.V.
Oops, yes. Thanks GDuncan.
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5/9/2005 5:47:42 PM: james kahl
Nice as always, 5 from me
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5/9/2005 7:15:36 PM: Avi
Brilliant as always, thanks for sharing 5G
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5/10/2005 12:41:06 AM: enmity
ok, looking at the screenshot, I knew it was you, Carles, always the exceptionally excellent style & quality:)
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5/10/2005 9:55:07 AM:
You 'R the best! 5 Globes from me... You are keeping us surprized with every new submission, nothing seems impossible for the best graphic GuRu's of PSCode.
You know what would be nice/great? To add something like Graying Picture (For Disabled Picture), Blend Picture (Seethru Like Draging an XP-icon on the Desktop) to the code. Keep up the good work!
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5/11/2005 9:12:46 AM: Matthew R. Usner
Phenomenal as always Carles.
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5/12/2005 7:04:26 AM:
Carles thank you for the updates and your quick responds. I hoped I could give you another Excellent rate! Keep up the good work.
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5/12/2005 10:34:38 AM: Heilan Percio Cardoso
Carles Strikes Again !
PS : Carles, all your dreams are alpha-blended with effects ? hehehehe
5 Globes.
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5/15/2005 3:05:55 PM: Aris Buenaventura
great job! :)
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5/16/2005 10:34:16 AM: Richard Mewett
Fantastic rendering quality + highly readable project = 5*
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5/25/2005 4:55:28 AM:
Exceptional Work, 5 Globes From Me.
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5/30/2005 7:09:16 AM: Richard Mewett
Over 1000 hits and just 23 votes - crazy! The feedback ratio seems to get ever lower on PSC...
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6/29/2005 1:22:13 PM: neurokaotix
I can't seem to find a program that will export bitmaps that work with your code. What did you use?
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7/1/2005 1:09:03 PM: Riccardo Cohen
The app within the code itself!
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7/7/2005 6:46:09 AM:
I too have some problems creating bitmaps that will work with the code. The code wont accept bitmaps generated with MS Paint and Photoshop cant create or open the image that comes with the code. It seems that the image provided with the code is saved in 32bit color depth. Anyone knows how to generate such an image? Any help would be greatly appreciated.
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12/27/2005 10:25:14 PM: LaVolpe
Carles, mind if I play with this & possibly add it to the PNG project I'm trying to post next month? Keith
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1/18/2006 9:50:31 AM: LaVolpe
Carles, most excellent. After several tests, I find your routines flawless. I do have one suggestion to add global alphablending without changing the DIB alpha as done in your "effects" samples; done on the fly: 1) Allow global 0-255 passed as parameter ByVal aGlobal As Long. 2) To keep integer math, multiply the global by 100, 3) When assigning a1, make it a1=(aSBitsR(i)*aGlobal)\25500&
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