reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | /* libs/graphics/animator/SkDrawColor.cpp |
| 2 | ** |
| 3 | ** Copyright 2006, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include "SkDrawColor.h" |
| 19 | #ifdef SK_DEBUG |
| 20 | #include "SkDisplayList.h" |
| 21 | #endif |
| 22 | #include "SkDrawPaint.h" |
| 23 | #include "SkParse.h" |
| 24 | #include "SkScript.h" |
| 25 | |
| 26 | enum HSV_Choice { |
| 27 | kGetHue, |
| 28 | kGetSaturation, |
| 29 | kGetValue |
| 30 | }; |
| 31 | |
| 32 | static SkScalar RGB_to_HSV(SkColor color, HSV_Choice choice) { |
| 33 | SkScalar red = SkIntToScalar(SkColorGetR(color)); |
| 34 | SkScalar green = SkIntToScalar(SkColorGetG(color)); |
| 35 | SkScalar blue = SkIntToScalar(SkColorGetB(color)); |
| 36 | SkScalar min = SkMinScalar(SkMinScalar(red, green), blue); |
| 37 | SkScalar value = SkMaxScalar(SkMaxScalar(red, green), blue); |
| 38 | if (choice == kGetValue) |
| 39 | return value/255; |
| 40 | SkScalar delta = value - min; |
| 41 | SkScalar saturation = value == 0 ? 0 : SkScalarDiv(delta, value); |
| 42 | if (choice == kGetSaturation) |
| 43 | return saturation; |
| 44 | SkScalar hue; |
| 45 | if (saturation == 0) |
| 46 | hue = 0; |
| 47 | else { |
| 48 | SkScalar part60 = SkScalarDiv(60 * SK_Scalar1, delta); |
| 49 | if (red == value) { |
| 50 | hue = SkScalarMul(green - blue, part60); |
| 51 | if (hue < 0) |
| 52 | hue += 360 * SK_Scalar1; |
| 53 | } |
| 54 | else if (green == value) |
| 55 | hue = 120 * SK_Scalar1 + SkScalarMul(blue - red, part60); |
| 56 | else // blue == value |
| 57 | hue = 240 * SK_Scalar1 + SkScalarMul(red - green, part60); |
| 58 | } |
| 59 | SkASSERT(choice == kGetHue); |
| 60 | return hue; |
| 61 | } |
| 62 | |
| 63 | #if defined _WIN32 && _MSC_VER >= 1300 // disable 'red', etc. may be used without having been initialized |
| 64 | #pragma warning ( push ) |
| 65 | #pragma warning ( disable : 4701 ) |
| 66 | #endif |
| 67 | |
| 68 | static SkColor HSV_to_RGB(SkColor color, HSV_Choice choice, SkScalar hsv) { |
| 69 | SkScalar hue = choice == kGetHue ? hsv : RGB_to_HSV(color, kGetHue); |
| 70 | SkScalar saturation = choice == kGetSaturation ? hsv : RGB_to_HSV(color, kGetSaturation); |
| 71 | SkScalar value = choice == kGetValue ? hsv : RGB_to_HSV(color, kGetValue); |
| 72 | value *= 255; |
| 73 | SkScalar red SK_INIT_TO_AVOID_WARNING; |
| 74 | SkScalar green SK_INIT_TO_AVOID_WARNING; |
| 75 | SkScalar blue SK_INIT_TO_AVOID_WARNING; |
| 76 | if (saturation == 0) // color is on black-and-white center line |
| 77 | red = green = blue = value; |
| 78 | else { |
| 79 | //SkScalar fraction = SkScalarMod(hue, 60 * SK_Scalar1); |
| 80 | int sextant = SkScalarFloor(hue / 60); |
| 81 | SkScalar fraction = hue / 60 - SkIntToScalar(sextant); |
| 82 | SkScalar p = SkScalarMul(value , SK_Scalar1 - saturation); |
| 83 | SkScalar q = SkScalarMul(value, SK_Scalar1 - SkScalarMul(saturation, fraction)); |
| 84 | SkScalar t = SkScalarMul(value, SK_Scalar1 - |
| 85 | SkScalarMul(saturation, SK_Scalar1 - fraction)); |
| 86 | switch (sextant % 6) { |
| 87 | case 0: red = value; green = t; blue = p; break; |
| 88 | case 1: red = q; green = value; blue = p; break; |
| 89 | case 2: red = p; green = value; blue = t; break; |
| 90 | case 3: red = p; green = q; blue = value; break; |
| 91 | case 4: red = t; green = p; blue = value; break; |
| 92 | case 5: red = value; green = p; blue = q; break; |
| 93 | } |
| 94 | } |
| 95 | //used to say SkToU8((U8CPU) red) etc |
| 96 | return SkColorSetARGB(SkColorGetA(color), SkScalarRound(red), |
| 97 | SkScalarRound(green), SkScalarRound(blue)); |
| 98 | } |
| 99 | |
| 100 | #if defined _WIN32 && _MSC_VER >= 1300 |
| 101 | #pragma warning ( pop ) |
| 102 | #endif |
| 103 | |
| 104 | enum SkDrawColor_Properties { |
| 105 | SK_PROPERTY(alpha), |
| 106 | SK_PROPERTY(blue), |
| 107 | SK_PROPERTY(green), |
| 108 | SK_PROPERTY(hue), |
| 109 | SK_PROPERTY(red), |
| 110 | SK_PROPERTY(saturation), |
| 111 | SK_PROPERTY(value) |
| 112 | }; |
| 113 | |
| 114 | #if SK_USE_CONDENSED_INFO == 0 |
| 115 | |
| 116 | const SkMemberInfo SkDrawColor::fInfo[] = { |
| 117 | SK_MEMBER_PROPERTY(alpha, Float), |
| 118 | SK_MEMBER_PROPERTY(blue, Float), |
| 119 | SK_MEMBER(color, ARGB), |
| 120 | SK_MEMBER_PROPERTY(green, Float), |
| 121 | SK_MEMBER_PROPERTY(hue, Float), |
| 122 | SK_MEMBER_PROPERTY(red, Float), |
| 123 | SK_MEMBER_PROPERTY(saturation, Float), |
| 124 | SK_MEMBER_PROPERTY(value, Float), |
| 125 | }; |
| 126 | |
| 127 | #endif |
| 128 | |
| 129 | DEFINE_GET_MEMBER(SkDrawColor); |
| 130 | |
| 131 | SkDrawColor::SkDrawColor() : fDirty(false) { |
| 132 | color = SK_ColorBLACK; |
| 133 | fHue = fSaturation = fValue = SK_ScalarNaN; |
| 134 | } |
| 135 | |
| 136 | bool SkDrawColor::add() { |
| 137 | if (fPaint->color != NULL) |
| 138 | return true; // error (probably color in paint as attribute as well) |
| 139 | fPaint->color = this; |
| 140 | fPaint->fOwnsColor = true; |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | SkDisplayable* SkDrawColor::deepCopy(SkAnimateMaker* maker) { |
| 145 | SkDrawColor* copy = new SkDrawColor(); |
| 146 | copy->color = color; |
| 147 | copy->fHue = fHue; |
| 148 | copy->fSaturation = fSaturation; |
| 149 | copy->fValue = fValue; |
| 150 | copy->fDirty = fDirty; |
| 151 | return copy; |
| 152 | } |
| 153 | |
| 154 | void SkDrawColor::dirty(){ |
| 155 | fDirty = true; |
| 156 | } |
| 157 | |
| 158 | #ifdef SK_DUMP_ENABLED |
| 159 | void SkDrawColor::dump(SkAnimateMaker* maker) { |
| 160 | dumpBase(maker); |
| 161 | SkDebugf("alpha=\"%d\" red=\"%d\" green=\"%d\" blue=\"%d\" />\n", |
| 162 | SkColorGetA(color)/255, SkColorGetR(color), |
| 163 | SkColorGetG(color), SkColorGetB(color)); |
| 164 | } |
| 165 | #endif |
| 166 | |
| 167 | SkColor SkDrawColor::getColor() { |
| 168 | if (fDirty) { |
| 169 | if (SkScalarIsNaN(fValue) == false) |
| 170 | color = HSV_to_RGB(color, kGetValue, fValue); |
| 171 | if (SkScalarIsNaN(fSaturation) == false) |
| 172 | color = HSV_to_RGB(color, kGetSaturation, fSaturation); |
| 173 | if (SkScalarIsNaN(fHue) == false) |
| 174 | color = HSV_to_RGB(color, kGetHue, fHue); |
| 175 | fDirty = false; |
| 176 | } |
| 177 | return color; |
| 178 | } |
| 179 | |
| 180 | SkDisplayable* SkDrawColor::getParent() const { |
| 181 | return fPaint; |
| 182 | } |
| 183 | |
| 184 | bool SkDrawColor::getProperty(int index, SkScriptValue* value) const { |
| 185 | value->fType = SkType_Float; |
| 186 | SkScalar result; |
| 187 | switch(index) { |
| 188 | case SK_PROPERTY(alpha): |
| 189 | result = SkIntToScalar(SkColorGetA(color)) / 255; |
| 190 | break; |
| 191 | case SK_PROPERTY(blue): |
| 192 | result = SkIntToScalar(SkColorGetB(color)); |
| 193 | break; |
| 194 | case SK_PROPERTY(green): |
| 195 | result = SkIntToScalar(SkColorGetG(color)); |
| 196 | break; |
| 197 | case SK_PROPERTY(hue): |
| 198 | result = RGB_to_HSV(color, kGetHue); |
| 199 | break; |
| 200 | case SK_PROPERTY(red): |
| 201 | result = SkIntToScalar(SkColorGetR(color)); |
| 202 | break; |
| 203 | case SK_PROPERTY(saturation): |
| 204 | result = RGB_to_HSV(color, kGetSaturation); |
| 205 | break; |
| 206 | case SK_PROPERTY(value): |
| 207 | result = RGB_to_HSV(color, kGetValue); |
| 208 | break; |
| 209 | default: |
| 210 | SkASSERT(0); |
| 211 | return false; |
| 212 | } |
| 213 | value->fOperand.fScalar = result; |
| 214 | return true; |
| 215 | } |
| 216 | |
| 217 | void SkDrawColor::onEndElement(SkAnimateMaker& maker){ |
| 218 | fDirty = true; |
| 219 | } |
| 220 | |
| 221 | bool SkDrawColor::setParent(SkDisplayable* parent) { |
| 222 | SkASSERT(parent != NULL); |
| 223 | if (parent->getType() == SkType_LinearGradient || parent->getType() == SkType_RadialGradient) |
| 224 | return false; |
| 225 | if (parent->isPaint() == false) |
| 226 | return true; |
| 227 | fPaint = (SkDrawPaint*) parent; |
| 228 | return false; |
| 229 | } |
| 230 | |
| 231 | bool SkDrawColor::setProperty(int index, SkScriptValue& value) { |
| 232 | SkASSERT(value.fType == SkType_Float); |
| 233 | SkScalar scalar = value.fOperand.fScalar; |
| 234 | switch (index) { |
| 235 | case SK_PROPERTY(alpha): |
| 236 | uint8_t alpha; |
| 237 | #ifdef SK_SCALAR_IS_FLOAT |
| 238 | alpha = scalar == SK_Scalar1 ? 255 : SkToU8((U8CPU) (scalar * 256)); |
| 239 | #else |
| 240 | alpha = SkToU8((scalar - (scalar >= SK_ScalarHalf)) >> 8); |
| 241 | #endif |
| 242 | color = SkColorSetARGB(alpha, SkColorGetR(color), |
| 243 | SkColorGetG(color), SkColorGetB(color)); |
| 244 | break; |
| 245 | case SK_PROPERTY(blue): |
| 246 | scalar = SkScalarClampMax(scalar, 255 * SK_Scalar1); |
| 247 | color = SkColorSetARGB(SkColorGetA(color), SkColorGetR(color), |
| 248 | SkColorGetG(color), SkToU8((U8CPU) scalar)); |
| 249 | break; |
| 250 | case SK_PROPERTY(green): |
| 251 | scalar = SkScalarClampMax(scalar, 255 * SK_Scalar1); |
| 252 | color = SkColorSetARGB(SkColorGetA(color), SkColorGetR(color), |
| 253 | SkToU8((U8CPU) scalar), SkColorGetB(color)); |
| 254 | break; |
| 255 | case SK_PROPERTY(hue): |
| 256 | fHue = scalar;//RGB_to_HSV(color, kGetHue); |
| 257 | fDirty = true; |
| 258 | break; |
| 259 | case SK_PROPERTY(red): |
| 260 | scalar = SkScalarClampMax(scalar, 255 * SK_Scalar1); |
| 261 | color = SkColorSetARGB(SkColorGetA(color), SkToU8((U8CPU) scalar), |
| 262 | SkColorGetG(color), SkColorGetB(color)); |
| 263 | break; |
| 264 | case SK_PROPERTY(saturation): |
| 265 | fSaturation = scalar;//RGB_to_HSV(color, kGetSaturation); |
| 266 | fDirty = true; |
| 267 | break; |
| 268 | case SK_PROPERTY(value): |
| 269 | fValue = scalar;//RGB_to_HSV(color, kGetValue); |
| 270 | fDirty = true; |
| 271 | break; |
| 272 | default: |
| 273 | SkASSERT(0); |
| 274 | return false; |
| 275 | } |
| 276 | return true; |
| 277 | } |
| 278 | |