gfx/skia/skia/src/gpu/batches/GrClearBatch.h
author Wes Kocher <wkocher@mozilla.com>
Wed, 10 May 2017 10:01:18 -0700
changeset 407965 ce2218406119c36a551e3faea4e192186ee46cc5
permissions -rw-r--r--
Backed out 9 changesets (bug 1340627) for graphical glitches a=backout Backed out changeset 0b1371055c7f (bug 1340627) Backed out changeset f152be1fadb7 (bug 1340627) Backed out changeset c691e2ab6a0c (bug 1340627) Backed out changeset 3cb4bceb8d79 (bug 1340627) Backed out changeset 026aadd76d06 (bug 1340627) Backed out changeset fdbd5d281287 (bug 1340627) Backed out changeset 75fb0d9858a9 (bug 1340627) Backed out changeset 0d4ec7d38a00 (bug 1340627) Backed out changeset af6f19870b2a (bug 1340627) MozReview-Commit-ID: 9dHr7xMZezY

/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef GrClearBatch_DEFINED
#define GrClearBatch_DEFINED

#include "GrBatch.h"
#include "GrBatchFlushState.h"
#include "GrFixedClip.h"
#include "GrGpu.h"
#include "GrGpuCommandBuffer.h"
#include "GrRenderTarget.h"

class GrClearBatch final : public GrBatch {
public:
    DEFINE_BATCH_CLASS_ID

    static sk_sp<GrClearBatch> Make(const GrFixedClip& clip, GrColor color, GrRenderTarget* rt) {
        sk_sp<GrClearBatch> batch(new GrClearBatch(clip, color, rt));
        if (!batch->renderTarget()) {
            return nullptr; // The clip did not contain any pixels within the render target.
        }
        return batch;
    }

    const char* name() const override { return "Clear"; }

    uint32_t renderTargetUniqueID() const override { return fRenderTarget.get()->uniqueID(); }
    GrRenderTarget* renderTarget() const override { return fRenderTarget.get(); }

    SkString dumpInfo() const override {
        SkString string("Scissor [");
        if (fClip.scissorEnabled()) {
            const SkIRect& r = fClip.scissorRect();
            string.appendf("L: %d, T: %d, R: %d, B: %d", r.fLeft, r.fTop, r.fRight, r.fBottom);
        }
        string.appendf("], Color: 0x%08x, RT: %d", fColor, fRenderTarget.get()->uniqueID());
        string.append(INHERITED::dumpInfo());
        return string;
    }

    void setColor(GrColor color) { fColor = color; }

private:
    GrClearBatch(const GrFixedClip& clip, GrColor color, GrRenderTarget* rt)
        : INHERITED(ClassID())
        , fClip(clip)
        , fColor(color) {
        SkIRect rtRect = SkIRect::MakeWH(rt->width(), rt->height());
        if (fClip.scissorEnabled()) {
            // Don't let scissors extend outside the RT. This may improve batching.
            if (!fClip.intersect(rtRect)) {
                return;
            }
            if (fClip.scissorRect() == rtRect) {
                fClip.disableScissor();
            }
        }
        this->setBounds(SkRect::Make(fClip.scissorEnabled() ? fClip.scissorRect() : rtRect),
                        HasAABloat::kNo, IsZeroArea::kNo);
        fRenderTarget.reset(rt);
    }

    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override {
        // This could be much more complicated. Currently we look at cases where the new clear
        // contains the old clear, or when the new clear is a subset of the old clear and is the
        // same color.
        GrClearBatch* cb = t->cast<GrClearBatch>();
        SkASSERT(cb->fRenderTarget == fRenderTarget);
        if (!fClip.windowRectsState().cheapEqualTo(cb->fClip.windowRectsState())) {
            return false;
        }
        if (cb->contains(this)) {
            fClip = cb->fClip;
            this->replaceBounds(*t);
            fColor = cb->fColor;
            return true;
        } else if (cb->fColor == fColor && this->contains(cb)) {
            return true;
        }
        return false;
    }

    bool contains(const GrClearBatch* that) const {
        // The constructor ensures that scissor gets disabled on any clip that fills the entire RT.
        return !fClip.scissorEnabled() ||
               (that->fClip.scissorEnabled() &&
                fClip.scissorRect().contains(that->fClip.scissorRect()));
    }

    void onPrepare(GrBatchFlushState*) override {}

    void onDraw(GrBatchFlushState* state) override {
        state->commandBuffer()->clear(fClip, fColor, fRenderTarget.get());
    }

    GrFixedClip                                             fClip;
    GrColor                                                 fColor;
    GrPendingIOResource<GrRenderTarget, kWrite_GrIOType>    fRenderTarget;

    typedef GrBatch INHERITED;
};

#endif