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1 /* |
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2 * Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 * |
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16 */ |
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17 |
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18 |
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19 |
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20 #include "HuiFxVg10BrightnessContrastFilter.h" |
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21 #include "HuiFxConstants.h" |
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22 |
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23 CHuiFxVg10BrightnessContrastFilter* CHuiFxVg10BrightnessContrastFilter::NewL() |
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24 { |
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25 CHuiFxVg10BrightnessContrastFilter* e = new (ELeave) CHuiFxVg10BrightnessContrastFilter(); |
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26 CleanupStack::PushL(e); |
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27 e->ConstructL(); |
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28 CleanupStack::Pop(e); |
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29 return e; |
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30 } |
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31 |
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32 void CHuiFxVg10BrightnessContrastFilter::ConstructL() |
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33 { |
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34 CHuiFxVg10ColorMatrixFilterBase::ConstructL(); |
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35 // neutral settings |
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36 iBrightness = 0.0f; |
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37 iContrast = 1.0f; |
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38 RegisterParameterL(KLitBrightness, &iBrightness); |
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39 RegisterParameterL(KLitContrast, &iContrast); |
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40 } |
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41 CHuiFxVg10BrightnessContrastFilter *CHuiFxVg10BrightnessContrastFilter::CloneL() const |
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42 { |
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43 CHuiFxVg10BrightnessContrastFilter *filter = new(ELeave) CHuiFxVg10BrightnessContrastFilter; |
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44 filter->CHuiFxVg10ColorMatrixFilterBase::CopyFromL(this); |
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45 filter->iBrightness = iBrightness; |
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46 filter->iContrast = iContrast; |
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47 filter->CopyParameterL(KLitBrightness, &filter->iBrightness, this); |
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48 filter->CopyParameterL(KLitContrast, &filter->iContrast, this); |
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49 return filter; |
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50 } |
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51 |
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52 void CHuiFxVg10BrightnessContrastFilter::UpdateColorMatrix(void) |
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53 { |
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54 // brightness [-1, 1] |
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55 const VGfloat offset_br = clamp(iBrightness, -1.0f, 1.0f); |
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56 const VGfloat scale_br = 1.0f - 0.5 * ((offset_br < 0.0f) ? -offset_br : offset_br); |
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57 |
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58 // contrast [0, N] |
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59 const VGfloat scale_con = clamp(iContrast, 0.0f, 100.0f); |
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60 const VGfloat offset_con = -0.5f * scale_con + 0.5f ; |
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61 |
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62 // combine the effects of brightness and contrast |
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63 const VGfloat off = offset_br + offset_con; |
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64 const VGfloat sc = scale_br * scale_con; |
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65 |
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66 // take opacity into account |
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67 const VGfloat opacity = clamp(iOpacity, 0.0f, 1.0f); |
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68 const VGfloat oOff = off * opacity; |
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69 const VGfloat oSc = (sc * opacity) + (1.0f - opacity); |
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70 |
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71 iColorMatrix[0] = oSc; |
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72 iColorMatrix[1] = 0.0f; |
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73 iColorMatrix[2] = 0.0f; |
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74 iColorMatrix[3] = 0.0f; |
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75 iColorMatrix[4] = 0.0f; |
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76 iColorMatrix[5] = oSc; |
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77 iColorMatrix[6] = 0.0f; |
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78 iColorMatrix[7] = 0.0f; |
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79 iColorMatrix[8] = 0.0f; |
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80 iColorMatrix[9] = 0.0f; |
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81 iColorMatrix[10] = oSc; |
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82 iColorMatrix[11] = 0.0f; |
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83 iColorMatrix[12] = 0.0f; |
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84 iColorMatrix[13] = 0.0f; |
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85 iColorMatrix[14] = 0.0f; |
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86 iColorMatrix[15] = 1.0f; |
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87 iColorMatrix[16] = oOff; |
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88 iColorMatrix[17] = oOff; |
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89 iColorMatrix[18] = oOff; |
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90 iColorMatrix[19] = 0.0f; |
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91 } |