/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/

#include "GrPathProcessor.h"

#include "gl/GrGLPathProcessor.h"
#include "gl/GrGLGpu.h"

#include "glsl/GrGLSLCaps.h"

GrPathProcessor::GrPathProcessor(GrColor color,
                                 const SkMatrix& viewMatrix,
                                 const SkMatrix& localMatrix)
    : INHERITED(true)
    , fColor(color)
    , fViewMatrix(viewMatrix)
    , fLocalMatrix(localMatrix) {
    this->initClassID<GrPathProcessor>();
}

void GrPathProcessor::getInvariantOutputColor(GrInitInvariantOutput* out) const {
    out->setKnownFourComponents(fColor);
}

void GrPathProcessor::getInvariantOutputCoverage(GrInitInvariantOutput* out) const {
    out->setKnownSingleComponent(0xff);
}

void GrPathProcessor::initBatchTracker(GrBatchTracker* bt, const GrPipelineOptimizations& opt) const {
    PathBatchTracker* local = bt->cast<PathBatchTracker>();
    if (!opt.readsColor()) {
        local->fInputColorType = kIgnored_GrGPInput;
        local->fColor = GrColor_ILLEGAL;
    } else {
        local->fInputColorType = kUniform_GrGPInput;
        if (!opt.getOverrideColorIfSet(&local->fColor)) {
            local->fColor = this->color();
        }
    }

    local->fInputCoverageType = opt.readsCoverage() ? kAllOnes_GrGPInput : kIgnored_GrGPInput;
    local->fUsesLocalCoords = opt.readsLocalCoords();
}

bool GrPathProcessor::canMakeEqual(const GrBatchTracker& m,
                                   const GrPrimitiveProcessor& that,
                                   const GrBatchTracker& t) const {
    if (this->classID() != that.classID() || !this->hasSameTextureAccesses(that)) {
        return false;
    }

    const GrPathProcessor& other = that.cast<GrPathProcessor>();
    if (!this->viewMatrix().cheapEqualTo(other.viewMatrix())) {
        return false;
    }

    const PathBatchTracker& mine = m.cast<PathBatchTracker>();
    const PathBatchTracker& theirs = t.cast<PathBatchTracker>();
    if (mine.fColor != theirs.fColor) {
        return false;
    }

    if (mine.fUsesLocalCoords != theirs.fUsesLocalCoords) {
        return false;
    }

    if (mine.fUsesLocalCoords && !this->localMatrix().cheapEqualTo(other.localMatrix())) {
        return false;
    }

    return true;
}

void GrPathProcessor::getGLProcessorKey(const GrBatchTracker& bt,
                                        const GrGLSLCaps& caps,
                                        GrProcessorKeyBuilder* b) const {
    GrGLPathProcessor::GenKey(*this, bt, caps, b);
}

GrGLPrimitiveProcessor* GrPathProcessor::createGLInstance(const GrBatchTracker& bt,
                                                          const GrGLSLCaps& caps) const {
    SkASSERT(caps.pathRenderingSupport());
    return SkNEW_ARGS(GrGLPathProcessor, (*this, bt));
}