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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 header 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 #ifndef GFXEDGELISTP_H |
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20 #define GFXEDGELISTP_H |
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21 |
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22 #include <e32std.h> |
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23 #include <e32base.h> |
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24 |
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25 #include "GfxFloatFixPt.h" |
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26 |
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27 class TSegSet; |
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28 class TGfxRendererInfoP; |
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29 |
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30 |
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31 //**************************************************** |
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32 |
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33 enum TAddSegStatus |
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34 { |
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35 ESegAdd, |
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36 ESegMerge, |
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37 ESegStartNew, |
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38 ESegIgnore |
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39 }; |
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40 |
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41 /** |
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42 * Helping class to store a point using 16 bits for each value. |
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43 * |
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44 * @lib Gfx2D.lib |
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45 * @since 1.0 |
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46 */ |
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47 class TPoint16 |
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48 { |
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49 public: |
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50 TInt16 iX; |
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51 TInt16 iY; |
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52 }; |
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53 |
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54 /** |
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55 * Helping class to store a size using 16 bits for each value. |
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56 * |
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57 * @lib Gfx2D.lib |
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58 * @since 1.0 |
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59 */ |
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60 class TSize16 |
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61 { |
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62 public: |
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63 TInt16 iWidth; |
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64 TInt16 iHeight; |
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65 }; |
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66 |
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67 /** |
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68 * Helping class to store a segment edge info. |
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69 * |
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70 * @lib Gfx2D.lib |
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71 * @since 1.0 |
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72 */ |
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73 class TGfxSegEdge |
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74 { |
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75 public: |
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76 TInt16 iStart; |
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77 TInt16 iEnd; |
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78 TInt16 iOnlyForFill; |
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79 TInt16 iSign; |
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80 TGfxSegEdge* iNext; |
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81 }; |
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82 |
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83 /** |
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84 * Helping class to store a segment set info. |
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85 * |
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86 * @lib Gfx2D.lib |
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87 * @since 1.0 |
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88 */ |
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89 class TSegSet |
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90 { |
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91 public: |
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92 /** |
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93 * Constructor |
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94 * |
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95 * @since 1.0 |
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96 * @param aP1 : initial segment point 1 |
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97 * @param aP2 : initial segment point 2 |
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98 * @return |
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99 */ |
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100 void Construct( TPoint16* aP1, TPoint16* aP2 ); |
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101 |
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102 /** |
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103 * Add a new segment to this set. |
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104 * |
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105 * @since 1.0 |
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106 * @param aX : x coordinate of new segment end point |
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107 * @param aY : y coordinate of new segment end point |
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108 * @param aLastSegLenSq : storage for new segment length squared value |
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109 * @param aClosePath : flag to indicate closing of path. |
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110 * @return |
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111 */ |
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112 TAddSegStatus AddSegment( TInt aX, |
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113 TInt aY, |
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114 TUint& aLastSegLenSq, |
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115 TBool aClosePath ); |
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116 |
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117 /** |
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118 * |
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119 * |
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120 * @since 1.0 |
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121 * @param aX1 : |
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122 * @param aX2 : |
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123 * @return |
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124 */ |
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125 TBool GetEdge( TInt& aX1, TInt& aX2 ); |
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126 |
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127 |
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128 /** |
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129 * Initialize the Digital Differential Analyzer (DDA) |
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130 * |
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131 * @since 1.0 |
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132 * @return |
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133 */ |
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134 void InitDDA(); |
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135 |
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136 public: |
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137 TPoint16* iTopPoint; |
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138 TPoint16* iBottomPoint; |
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139 TPoint16* iFillOnlySeg; |
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140 TSegSet* iNext; |
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141 TSegSet* iConnect; |
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142 |
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143 TInt16 iPointAryInc; // -1 or 1 |
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144 TInt16 iSign; // -1, 0, or 1 |
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145 TInt16 iValid; |
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146 TInt16 iActualBottomY; |
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147 TInt16 iConnectFlag; |
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148 |
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149 protected: |
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150 // DDA info |
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151 TPoint16* iStart; |
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152 TPoint16* iFinish; |
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153 |
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154 TPoint16 iInc; |
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155 TPoint16 iPos; |
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156 TSize16 iDifference; |
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157 TInt16 iGradient; |
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158 TInt16 iCount; |
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159 TInt16 iStatus; |
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160 |
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161 protected: |
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162 |
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163 /** |
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164 * Construct the Digital Differential Analyzer (DDA) |
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165 * |
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166 * @since 1.0 |
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167 * @param aStart : start point |
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168 * @param aFinish : end point |
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169 * @return |
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170 */ |
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171 void ConstructDDA( TPoint16* aStart, TPoint16* aFinish ); |
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172 |
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173 /** |
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174 * |
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175 * |
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176 * @since 1.0 |
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177 * @param aPosition : |
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178 * @return |
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179 */ |
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180 TBool SingleStep( TPoint16& aPosition ); |
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181 |
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182 /** |
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183 * |
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184 * |
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185 * @since 1.0 |
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186 * @param aStartPosition : |
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187 * @param aEndPosition : |
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188 * @return |
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189 */ |
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190 TBool SingleScanline( TPoint16& aStartPosition, |
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191 TPoint16& aEndPosition ); |
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192 |
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193 /** |
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194 * |
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195 * |
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196 * @since 1.0 |
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197 * @return |
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198 */ |
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199 void UpdatePosition(); |
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200 }; |
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201 |
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202 |
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203 |
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204 |
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205 /** |
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206 * This class maintains a list of segment edges, used for scanning a line |
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207 * inside two edges. |
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208 * |
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209 * @lib SVGEngine.lib |
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210 * @since 1.0 |
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211 */ |
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212 class CGfxEdgeListP : public CBase |
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213 { |
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214 public: |
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215 |
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216 /** |
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217 * Two-phase constructor. |
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218 * |
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219 * @since 1.0 |
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220 * @param aRenderInfo : rendering info |
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221 * @return |
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222 */ |
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223 static CGfxEdgeListP* NewLC( TGfxRendererInfoP* aRenderInfo ); |
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224 |
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225 /** |
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226 * Two-phase constructor. |
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227 * |
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228 * @since 1.0 |
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229 * @param aRenderInfo : rendering info |
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230 * @return |
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231 */ |
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232 static CGfxEdgeListP* NewL( TGfxRendererInfoP* aRenderInfo ); |
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233 |
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234 /** |
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235 * Destructor. |
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236 * |
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237 * @since 1.0 |
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238 * @return |
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239 */ |
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240 ~CGfxEdgeListP(); |
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241 |
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242 public: |
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243 |
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244 /** |
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245 * Get the start point in the edge list. |
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246 * |
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247 * @since 1.0 |
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248 * @param aX : storage for starting point x coordinate. |
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249 * @param aY : storage for starting point y coordinate. |
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250 * @return |
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251 */ |
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252 void StartPoint( TFloatFixPt& aX, TFloatFixPt& aY ); |
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253 |
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254 /** |
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255 * Add a new point to this list. |
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256 * |
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257 * @since 1.0 |
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258 * @param aX : x coordinate of point |
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259 * @param aY : y coordinate of point |
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260 * @param aFillOnly : fill-onyl flag |
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261 * @param aClosePath : close-path flag |
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262 * @return |
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263 */ |
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264 void AddPoint( TFloatFixPt & aX, |
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265 TFloatFixPt & aY, |
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266 TBool aFillOnly, |
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267 TBool aClosePath ); |
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268 /** |
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269 * Clear all points in this list. |
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270 * |
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271 * @since 1.0 |
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272 * @return |
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273 */ |
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274 void Reset(); |
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275 |
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276 /** |
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277 * Intialize this edge list. |
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278 * |
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279 * @since 1.0 |
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280 * @return |
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281 */ |
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282 void SetupEdgeList(); |
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283 |
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284 /** |
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285 * Update the active edge. |
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286 * |
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287 * @since 1.0 |
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288 * @param aY : line y coordinate |
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289 * @return |
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290 */ |
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291 void UpdateActiveEdge( TInt aY ); |
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292 |
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293 /** |
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294 * Get the active segment edge. |
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295 * |
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296 * @since 1.0 |
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297 * @return segment edge. |
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298 */ |
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299 TGfxSegEdge* EdgeList(); |
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300 |
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301 /** |
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302 * Adjust the level of detail to the given vertex size. |
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303 * |
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304 * @since 1.0 |
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305 * @param aVertexSize : vertex size |
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306 * @return |
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307 */ |
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308 void AdjustShapeComplexityL( TInt32 aVertexSize ); |
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309 |
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310 protected: |
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311 |
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312 /** |
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313 * Constructor |
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314 * |
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315 * @since 1.0 |
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316 * @return |
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317 */ |
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318 CGfxEdgeListP(); |
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319 |
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320 /** |
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321 * Constructor |
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322 * |
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323 * @since 1.0 |
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324 * @param iRenderInfo : rendering info |
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325 * @return |
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326 */ |
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327 CGfxEdgeListP( TGfxRendererInfoP* iRenderInfo ); |
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328 |
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329 /** |
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330 * Second-phase of construction |
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331 * |
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332 * @since 1.0 |
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333 * @return |
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334 */ |
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335 void ConstructL(); |
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336 |
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337 private: |
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338 |
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339 /** |
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340 * Add a new edge. |
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341 * |
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342 * @since 1.0 |
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343 * @param aSt : start point |
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344 * @param aEd : end point |
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345 * @return |
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346 */ |
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347 TGfxSegEdge* AddEdge( TInt32 aSt, TInt32 aEd );//, TInt aSegSign); |
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348 |
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349 /** |
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350 * Add the given set of segments to this list. |
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351 * |
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352 * @since 1.0 |
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353 * @param aWaitingList : flag to wait |
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354 * @param aSegSet : set of segments |
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355 * @return |
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356 */ |
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357 void InsertToList( TBool aWaitingList, TSegSet& aSegSet ); |
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358 |
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359 /** |
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360 * Check and Connect |
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361 * |
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362 * @since 1.0 |
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363 * @return |
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364 */ |
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365 void CheckAndConnect(); |
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366 |
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367 /** |
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368 * Simple update of active edge. |
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369 * |
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370 * @since 1.0 |
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371 * @param aY : line y coordinate |
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372 * @return |
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373 */ |
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374 void UpdateActiveEdgeSimple( TInt aY ); |
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375 |
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376 protected: |
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377 TInt32 iMinX, iMinY; |
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378 TInt32 iMaxX, iMaxY; |
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379 |
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380 TGfxSegEdge* iEdges; |
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381 TInt iEdgesCount; |
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382 |
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383 TUint iPolygonAreaSize; |
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384 TUint iLastSegLenSq; |
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385 |
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386 TPoint16* iPoints; |
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387 TSegSet* iSegset; |
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388 TSegSet* iWaitingSegList; |
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389 TSegSet* iActiveSegList; |
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390 TGfxSegEdge* iSortedEdges; |
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391 |
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392 TInt iPointsCount; |
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393 TInt iSegsetCount; |
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394 TInt iPointsCountMax; |
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395 TInt iSegsetCountMax; |
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396 TInt iEdgesCountMax; |
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397 |
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398 TGfxRendererInfoP* iRenderInfo; |
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399 |
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400 private: |
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401 TSegSet* iSegListForSimple[2]; |
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402 TSegSet* iStartSeg; |
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403 TBool iIsNewOutlineStarted; |
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404 TInt iSubPathSegmentCount; |
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405 |
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406 private: |
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407 friend class TGfxPolygonRendererP; |
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408 friend class TGfxStrokeRendererP; |
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409 friend class CGfx2dGc; |
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410 friend class TSegSet; |
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411 }; |
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412 |
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413 #endif // GFXEDGELISTP_H |
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414 |