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1 /* |
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2 * Copyright (c) 2002 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: Graphics Extension Library source file |
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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 #include "GfxPolygonRendererP.h" |
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20 #include "GfxPaint.h" |
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21 #include "GfxColor.h" |
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22 #include "GfxRendererInfoP.h" |
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23 #include "GfxEdgeListP.h" |
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24 |
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25 |
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26 // --------------------------------------------------------------------------- |
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27 // Constructor |
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28 // --------------------------------------------------------------------------- |
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29 // -------------------------------------------------------------------------- |
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30 // TGfxPolygonRendererP::TGfxPolygonRendererP() |
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31 // --------------------------------------------------------------------------- |
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32 TGfxPolygonRendererP::TGfxPolygonRendererP() |
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33 { |
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34 } |
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35 |
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36 // -------------------------------------------------------------------------- |
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37 // void TGfxPolygonRendererP::InitializeP( CGfxEdgeListP* aEdgeList, |
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38 // --------------------------------------------------------------------------- |
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39 void TGfxPolygonRendererP::InitializeP( CGfxEdgeListP* aEdgeList, |
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40 TGfxRendererInfoP* aRenderInfo, |
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41 MGfxPaint* aPaint, |
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42 TBool aWindingNoneZero ) |
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43 { |
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44 iEdgeList = aEdgeList; |
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45 iRenderInfo = aRenderInfo; |
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46 iPaint = aPaint; |
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47 iWindingNoneZero = aWindingNoneZero; |
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48 } |
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49 |
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50 // -------------------------------------------------------------------------- |
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51 // void TGfxPolygonRendererP::RenderScanlineL( TInt aY, TUint32 /* aAlpha */ ) |
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52 // --------------------------------------------------------------------------- |
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53 void TGfxPolygonRendererP::RenderScanlineL( TInt aY, TUint32 /* aAlpha */ ) |
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54 { |
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55 if ( iRenderInfo->iClipMinY >= aY || aY > iRenderInfo->iClipMaxY ) |
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56 return; |
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57 |
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58 TInt edgeCount = iEdgeList->iEdgesCount; |
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59 TGfxSegEdge dummyEdge; |
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60 dummyEdge.iEnd = -1; // less than 0 |
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61 dummyEdge.iSign = 100; // neither -1, 0, or 1 |
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62 |
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63 TUint16 flatColor; |
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64 flatColor = TGfxColor( iPaint->FlatColor() ).ColorRgb(); |
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65 |
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66 // ************ Buffer is 2 bytes per pixel ********** |
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67 TUint16* fb; |
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68 |
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69 fb = ( ( TUint16 * ) iRenderInfo->iDstBuf ) + |
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70 aY * iRenderInfo->iWidth; |
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71 |
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72 |
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73 TInt i, j; |
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74 |
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75 TInt edgeSignSum = 0; |
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76 TBool fill = EFalse; |
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77 TGfxSegEdge* lastEdge =& dummyEdge; // iEdgeList->EdgeList(); |
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78 TGfxSegEdge* currentEdge = iEdgeList->EdgeList(); |
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79 for ( i = 0; i < edgeCount; i++ ) |
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80 { |
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81 // Fill between edges |
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82 TInt32 fbXmin, fbXmax; |
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83 if ( fill ) |
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84 { |
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85 fbXmin = lastEdge->iStart + iEdgeList->iMinX; |
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86 fbXmax = currentEdge->iEnd + iEdgeList->iMinX; |
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87 if ( fbXmax >= iRenderInfo->iClipMinX && |
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88 fbXmin < iRenderInfo->iClipMaxX ) // inside clipping |
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89 { |
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90 if ( fbXmin < iRenderInfo->iClipMinX ) |
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91 { |
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92 fbXmin = iRenderInfo->iClipMinX; |
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93 } |
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94 if ( iRenderInfo->iClipMaxX <= fbXmax ) |
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95 { |
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96 fbXmax = iRenderInfo->iClipMaxX - 1; |
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97 } |
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98 TUint16* fbb =& fb[fbXmin]; |
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99 |
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100 TInt fbw = fbXmax - fbXmin; |
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101 if ( fbw > 10 ) |
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102 { |
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103 DrawHLine( fbb, flatColor, fbXmin, fbw ); |
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104 } |
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105 else |
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106 { |
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107 for ( j = fbXmin; j <= fbXmax ; j++ ) |
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108 *fbb++ = flatColor; |
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109 } |
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110 } |
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111 } // end if (fill) |
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112 |
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113 // update sum of sign and determine fill/non-fill |
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114 |
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115 if ( iWindingNoneZero ) |
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116 { |
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117 fill = ( edgeSignSum += currentEdge->iSign ); // Non-zero rule. |
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118 } |
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119 else |
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120 { |
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121 fill = ( ++edgeSignSum & 1 ); // Even/odd rule. |
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122 } |
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123 |
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124 lastEdge = currentEdge; |
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125 currentEdge = currentEdge->iNext; |
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126 } // end for i (each edges) |
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127 } |
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128 |
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129 |
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130 |