src/gpu/graphite/Precompile.cpp

/*
 * Copyright 2022 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "include/core/SkTypes.h"

#ifdef SK_ENABLE_PRECOMPILE

#include "src/gpu/graphite/Precompile.h"
#include "src/gpu/graphite/PrecompileBasePriv.h"

namespace skgpu::graphite {

//--------------------------------------------------------------------------------------------------
int PaintOptions::numShaderCombinations() const {
    int numShaderCombinations = 0;
    for (const sk_sp<PrecompileShader>& s : fShaderOptions) {
        numShaderCombinations += s->numCombinations();
    }

    // If no shader option is specified we will add a solid color shader option
    return numShaderCombinations ? numShaderCombinations : 1;
}

int PaintOptions::numMaskFilterCombinations() const {
    int numMaskFilterCombinations = 0;
    for (const sk_sp<PrecompileMaskFilter>& mf : fMaskFilterOptions) {
        numMaskFilterCombinations += mf->numCombinations();
    }

    // If no mask filter options are specified we will use the geometry's coverage
    return numMaskFilterCombinations ? numMaskFilterCombinations : 1;
}

int PaintOptions::numColorFilterCombinations() const {
    int numColorFilterCombinations = 0;
    for (const sk_sp<PrecompileColorFilter>& cf : fColorFilterOptions) {
        numColorFilterCombinations += cf->numCombinations();
    }

    // If no color filter options are specified we will use the unmodified result color
    return numColorFilterCombinations ? numColorFilterCombinations : 1;
}

int PaintOptions::numBlendModeCombinations() const {
    bool bmBased = false;
    int numBlendCombos = 0;
    for (auto b: fBlenderOptions) {
        if (b->asBlendMode().has_value()) {
            bmBased = true;
        } else {
            numBlendCombos += b->numChildCombinations();
        }
    }

    if (bmBased || !numBlendCombos) {
        // If numBlendCombos is zero we will fallback to kSrcOver blending
        ++numBlendCombos;
    }

    return numBlendCombos;
}

int PaintOptions::numCombinations() const {
    // TODO: we need to handle ImageFilters separately
    return this->numShaderCombinations() *
           this->numMaskFilterCombinations() *
           this->numColorFilterCombinations() *
           this->numBlendModeCombinations();
}

} // namespace skgpu::graphite

#endif // SK_ENABLE_PRECOMPILE