| /* |
| * 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 Crossfade
|
| < namespace : "flex";
|
| vendor : "Adobe Systems";
|
| version : 1;
|
| description : "Crossfade between two images, for use with Flex effects"; >
|
| {
|
| parameter float progress;
|
| parameter float width;
|
| parameter float height;
|
|
|
| // First parameter is unused in AnimateTransitionShader effect
|
| input image4 src0;
|
| input image4 from;
|
| input image4 to;
|
| output pixel4 dst;
|
|
|
| void evaluatePixel()
|
| {
|
| // Acquire the pixel values from both images at the current location
|
| float2 coord = outCoord();
|
| float4 color0 = sampleNearest(src0, coord);
|
| float4 fromPixel = sampleNearest(from, coord);
|
| float4 toPixel = sampleNearest(to, coord);
|
| float prog = progress;
|
|
|
| // Output equals mixture of two pixels, according to progress value
|
| dst = mix(fromPixel, toPixel, progress);
|
| // workaround for Flash filter bug that replicates last column/row
|
| if (coord.x >= width || coord.y >= height)
|
| dst.a = 0.0;
|
| }
|
| }
|