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Viewing changes to tools/planettool/FloatPixMap/FPMQuantize.c

  • Committer: Package Import Robot
  • Author(s): Nicolas Boulenguez
  • Date: 2011-12-22 00:22:39 UTC
  • mfrom: (1.2.2)
  • Revision ID: package-import@ubuntu.com-20111222002239-pr3upeupp4jw1psp
Tags: 1.76-1
* New upstream.
* watch: scan upstream stable releases instead of dev snapshots.
* control: use default gobjc instead of explicit 4.6.
* rules: use dpkg-dev build flags.

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tools/planettool/FloatPixMap/FPMQuantize.c
 
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/*
 
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 *  FPMQuantize.c
 
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 *  planettool
 
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 *
 
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 *  Created by Jens Ayton on 2009-10-01.
 
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 *  Copyright 2009 Jens Ayton. All rights reserved.
 
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 *
 
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 */
 
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#include "FPMQuantize.h"
 
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#include "FPMImageOperations.h"
 
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static float QuantizeComponentClip(float v, float srcToStepsFactor, float srcToStepsOffset, float stepsToTargetFactor, float stepMax, float targetMin)
 
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{
 
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        v = v * srcToStepsFactor - srcToStepsOffset;
 
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        v = fmaxf(0.0f, fminf(v, stepMax));
 
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        v = roundf(v);
 
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        v = v * stepsToTargetFactor + targetMin;
 
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        return v;
 
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}
 
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static float QuantizeComponent(float v, float srcToStepsFactor, float srcToStepsOffset, float stepsToTargetFactor, float targetMin)
 
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{
 
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        v = v * srcToStepsFactor - srcToStepsOffset;
 
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        v = roundf(v);
 
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        v = v * stepsToTargetFactor + targetMin;
 
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        return v;
 
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}
 
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void FPMQuantize(FloatPixMapRef pm, float srcMin, float srcMax, float targetMin, float targetMax, unsigned steps, FPMQuantizeFlags options)
 
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{
 
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        if (pm == NULL)  return;
 
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        float srcScale = srcMax - srcMin;
 
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        float targetScale = targetMax - targetMin;
 
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        float stepMax = steps - 1;
 
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        float srcToStepsFactor = stepMax / srcScale;
 
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        float srcToStepsOffset = srcToStepsFactor * srcMin;
 
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        bool clip = options & kFMPQuantizeClip;
 
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        float stepsToTargetFactor = targetScale / stepMax;
 
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        // FIXME: implement dithering and jitter.
 
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        if (clip)
 
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        {
 
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                FPM_FOR_EACH_PIXEL(pm, true)
 
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                        pixel->r = QuantizeComponentClip(pixel->r, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, stepMax, targetMin);
 
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                        pixel->g = QuantizeComponentClip(pixel->g, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, stepMax, targetMin);
 
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                        pixel->b = QuantizeComponentClip(pixel->b, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, stepMax, targetMin);
 
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                        pixel->a = QuantizeComponentClip(pixel->a, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, stepMax, targetMin);
 
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                FPM_END_FOR_EACH_PIXEL
 
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        }
 
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        else
 
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        {
 
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                FPM_FOR_EACH_PIXEL(pm, true)
 
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                        pixel->r = QuantizeComponent(pixel->r, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, targetMin);
 
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                        pixel->g = QuantizeComponent(pixel->g, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, targetMin);
 
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                        pixel->b = QuantizeComponent(pixel->b, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, targetMin);
 
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                        pixel->a = QuantizeComponent(pixel->a, srcToStepsFactor, srcToStepsOffset, stepsToTargetFactor, targetMin);
 
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                FPM_END_FOR_EACH_PIXEL
 
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        }
 
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}