1/*
2 * Copyright 2018 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8in fragmentProcessor inputFP;
9in fragmentProcessor  maskFP;
10in uniform half innerThreshold;
11in uniform half outerThreshold;
12
13@optimizationFlags {
14    ProcessorOptimizationFlags(inputFP.get()) &
15    ((outerThreshold >= 1.0) ? kPreservesOpaqueInput_OptimizationFlag : kNone_OptimizationFlags)
16}
17
18half4 main() {
19    half4 color = sample(inputFP);
20    half4 mask_color = sample(maskFP);
21    if (mask_color.a < 0.5) {
22        if (color.a > outerThreshold) {
23            half scale = outerThreshold / color.a;
24            color.rgb *= scale;
25            color.a = outerThreshold;
26        }
27    } else if (color.a < innerThreshold) {
28        half scale = innerThreshold / max(0.001, color.a);
29        color.rgb *= scale;
30        color.a = innerThreshold;
31    }
32    return color;
33}
34
35@test(testData) {
36    // Make the inner and outer thresholds be in [0, 1].
37    float outerThresh = testData->fRandom->nextUScalar1();
38    float innerThresh = testData->fRandom->nextUScalar1();
39    std::unique_ptr<GrFragmentProcessor> inputChild, maskChild;
40    if (testData->fRandom->nextBool()) {
41        inputChild = GrProcessorUnitTest::MakeChildFP(testData);
42    }
43    maskChild = GrProcessorUnitTest::MakeChildFP(testData);
44
45    return GrAlphaThresholdFragmentProcessor::Make(std::move(inputChild), std::move(maskChild),
46                                                   innerThresh, outerThresh);
47}
48