| //////////////////////////////////////////////////////////////////////////////// |
| // |
| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You under the Apache License, Version 2.0 |
| // (the "License"); you may not use this file except in compliance with |
| // the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| <languageVersion : 1.0;> |
| |
| kernel ColorBurn |
| |
| < namespace : "Flame"; |
| |
| vendor : "Adobe"; |
| |
| version : 1; |
| |
| description : "ColorBurn blend mode"; |
| |
| > |
| |
| { |
| |
| input image4 dst; |
| |
| input image4 src; |
| |
| output pixel4 result; |
| |
| |
| |
| void |
| |
| evaluatePixel() |
| |
| { |
| |
| pixel4 a = sampleNearest(dst,outCoord()); //cb |
| |
| pixel4 b = sampleNearest(src,outCoord()); //cs |
| |
| |
| |
| // remove premultiplied (srcCP/srcA, dstCP/dstA) |
| |
| pixel3 cb = a.rgb; |
| |
| pixel3 cs = b.rgb; |
| |
| if (a.a > 0.0) { |
| |
| cb.rgb = a.rgb / a.a; |
| |
| } |
| |
| if (b.a > 0.0) { |
| |
| cs.rgb = b.rgb / b.a; |
| |
| } |
| |
| |
| |
| // dstA' = (1-srcA)*dstA + srcA |
| |
| result.a = (1.0-b.a)*a.a + b.a; |
| |
| |
| |
| // temp for Blend(srcCP/srcA, dstCP/dstA) |
| |
| pixel3 blendResult; |
| |
| |
| |
| // = 1, if cb = 1 (*** this case is AE/PS and AGM only, not PDF spec) |
| |
| // = 0, if (1 � cb) >= cs |
| |
| // = (1 � cb) / cs, otherwise |
| |
| if (cb.r == 1.0) { |
| |
| blendResult.r = 1.0; |
| |
| } else if ((1.0 - cb.r) >= cs.r) { |
| |
| blendResult.r = 0.0; |
| |
| } else { |
| |
| blendResult.r = 1.0 - (1.0 - cb.r) / cs.r; |
| |
| } |
| |
| |
| |
| if (cb.g == 1.0) { |
| |
| blendResult.g = 1.0; |
| |
| } else if ((1.0 - cb.g) >= cs.g) { |
| |
| blendResult.g = 0.0; |
| |
| } else { |
| |
| blendResult.g = 1.0 - (1.0 - cb.g) / cs.g; |
| |
| } |
| |
| |
| |
| if (cb.b == 1.0) { |
| |
| blendResult.b = 1.0; |
| |
| } else if ((1.0 - cb.b) >= cs.b) { |
| |
| blendResult.b = 0.0; |
| |
| } else { |
| |
| blendResult.b = 1.0 - (1.0 - cb.b) / cs.b; |
| |
| } |
| |
| |
| |
| // dstCP' = (1-srcA)*dstCP + (1-dstA)*srcCP + srcA*dstA*Blend(srcCP/srcA, dstCP/dstA) |
| |
| result.rgb = (1.0-b.a)*a.rgb + (1.0-a.a)*b.rgb + b.a*a.a*blendResult.rgb; |
| |
| } |
| |
| } |
| |
