ImageInterpolation

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ImageInterpolation

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High quality, pure pascal image interpolation (resizing/scaling) using TBitmap (VCL/FMX)

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resizeimageunit.pas

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High quality, multi-platform pascal image interpolation (resizing/scaling) using TBitmap (VCL/FMX)

# Supported sampling filters:
Nearest neighbor 
Bilinear 
Cosine 
Hermite 
Quadratic 
Gaussian 
Spline 
Lanczos 
Mitchell 
CatmullRom (bicubic)

# Introduction
I was having a very hard time finding image scaling (resizing) code that is free to use, simple to integrate and high in quality. I finally managed to find usable code in mark mauder's vampyre imaging library, but it was wrapped in a lot of code that overly complicated the specific use function I needed.
 
I ended up modifying the code to make it simpler to use with both the VCL and FMX versions of TBitmap.

# Usage:
StretchResample(const SrcImage: TBitmap; SrcX, SrcY, SrcWidth,SrcHeight: LongInt; var DstImage: TBitmap; DstX, DstY, DstWidth, DstHeight: LongInt; Filter: TSamplingFilter; WrapEdges: Boolean = False); overload;

# Example of resizing an image 50% :
ResizedImage.Width := SourceImage.Width div 2; 
ResizedImage.Height := SourceImage.Height div 2; 
StretchResample(SourceBitmap,0,0, MySourceBitmap.Width, MySourceBitmap.Height,ResizedBitmap,0,0,ResizedBitmap.Width,ResizedBitmap, sfLanczos,False);

# Notes:
For simplicity, I only supported 32bit (R/G/B/A) bitmap. 
The code is pure pascal, there are no low level CPU-specific optimizations.

# Credits:
Based on the Vampyre Imaging Library by Marek Mauder 
https://imaginglib.sourceforge.net

Modified for simplicity of use with TBitmap VCL/FMX classes by Yaron Gur

ImageInterpolation

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