C++ GrDrawState::setGeometryProcessor方法代码示例

//.........这里部分代码省略.........
        // Check devBounds
        SkASSERT(check_bounds<LineVertex>(drawState, devBounds, arg.vertices(),
                                          kVertsPerLineSeg * lineCnt));

        {
            GrDrawState::AutoRestoreEffects are(drawState);
            target->setIndexSourceToBuffer(fLinesIndexBuffer);
            int lines = 0;
            while (lines < lineCnt) {
                int n = SkTMin(lineCnt - lines, kNumLineSegsInIdxBuffer);
                target->drawIndexed(kTriangles_GrPrimitiveType,
                                    kVertsPerLineSeg*lines,     // startV
                                    0,                          // startI
                                    kVertsPerLineSeg*n,         // vCount
                                    kIdxsPerLineSeg*n,          // iCount
                                    &devBounds);
                lines += n;
            }
        }
    }

    // then quadratics/conics
    if (quadCnt || conicCnt) {
        GrDrawTarget::AutoReleaseGeometry arg;
        SkRect devBounds;

        if (!this->createBezierGeom(path,
                                    target,
                                    quads,
                                    quadCnt,
                                    conics,
                                    conicCnt,
                                    qSubdivs,
                                    cWeights,
                                    &arg,
                                    &devBounds)) {
            return false;
        }

        GrDrawTarget::AutoStateRestore asr;

        // createGeom transforms the geometry to device space when the matrix does not have
        // perspective.
        if (target->getDrawState().getViewMatrix().hasPerspective()) {
            asr.set(target, GrDrawTarget::kPreserve_ASRInit);
        } else if (!asr.setIdentity(target, GrDrawTarget::kPreserve_ASRInit)) {
            return false;
        }
        GrDrawState* drawState = target->drawState();

        static const int kEdgeAttrIndex = 1;

        // Check devBounds
        SkASSERT(check_bounds<BezierVertex>(drawState, devBounds, arg.vertices(),
                                            kVertsPerQuad * quadCnt + kVertsPerQuad * conicCnt));

        if (quadCnt > 0) {
            GrEffect* hairQuadEffect = GrQuadEffect::Create(kHairlineAA_GrEffectEdgeType,
                                                            *target->caps());
            SkASSERT(hairQuadEffect);
            GrDrawState::AutoRestoreEffects are(drawState);
            target->setIndexSourceToBuffer(fQuadsIndexBuffer);
            drawState->setGeometryProcessor(hairQuadEffect, kEdgeAttrIndex)->unref();
            int quads = 0;
            while (quads < quadCnt) {
                int n = SkTMin(quadCnt - quads, kNumQuadsInIdxBuffer);
                target->drawIndexed(kTriangles_GrPrimitiveType,
                                    kVertsPerQuad*quads,               // startV
                                    0,                                 // startI
                                    kVertsPerQuad*n,                   // vCount
                                    kIdxsPerQuad*n,                    // iCount
                                    &devBounds);
                quads += n;
            }
        }

        if (conicCnt > 0) {
            GrDrawState::AutoRestoreEffects are(drawState);
            GrEffect* hairConicEffect = GrConicEffect::Create(kHairlineAA_GrEffectEdgeType,
                                                              *target->caps());
            SkASSERT(hairConicEffect);
            drawState->setGeometryProcessor(hairConicEffect, 1, 2)->unref();
            int conics = 0;
            while (conics < conicCnt) {
                int n = SkTMin(conicCnt - conics, kNumQuadsInIdxBuffer);
                target->drawIndexed(kTriangles_GrPrimitiveType,
                                    kVertsPerQuad*(quadCnt + conics),  // startV
                                    0,                                 // startI
                                    kVertsPerQuad*n,                   // vCount
                                    kIdxsPerQuad*n,                    // iCount
                                    &devBounds);
                conics += n;
            }
        }
    }

    target->resetIndexSource();

    return true;
}

void GrDistanceFieldTextContext::flush() {
    if (NULL == fDrawTarget) {
        return;
    }

    if (fCurrVertex > 0) {
        GrDrawState drawState;
        drawState.setFromPaint(fPaint, fContext->getMatrix(), fContext->getRenderTarget());
        bool useColorVerts = !fUseLCDText;
        set_vertex_attributes(&drawState, useColorVerts);

        // setup our sampler state for our text texture/atlas
        SkASSERT(SkIsAlign4(fCurrVertex));

        // get our current color
        SkColor filteredColor;
        SkColorFilter* colorFilter = fSkPaint.getColorFilter();
        if (colorFilter) {
            filteredColor = colorFilter->filterColor(fSkPaint.getColor());
        } else {
            filteredColor = fSkPaint.getColor();
        }
        this->setupCoverageEffect(filteredColor);

        // Effects could be stored with one of the cache objects (atlas?)
        drawState.setGeometryProcessor(fCachedGeometryProcessor.get());

        // Set draw state
        if (fUseLCDText) {
            GrColor colorNoPreMul = skcolor_to_grcolor_nopremultiply(filteredColor);
            if (kOne_GrBlendCoeff != fPaint.getSrcBlendCoeff() ||
                kISA_GrBlendCoeff != fPaint.getDstBlendCoeff() ||
                fPaint.numColorStages()) {
                SkDebugf("LCD Text will not draw correctly.\n");
            }
            SkASSERT(!drawState.hasColorVertexAttribute());
            // We don't use the GrPaint's color in this case because it's been premultiplied by
            // alpha. Instead we feed in a non-premultiplied color, and multiply its alpha by
            // the mask texture color. The end result is that we get
            //            mask*paintAlpha*paintColor + (1-mask*paintAlpha)*dstColor
            int a = SkColorGetA(fSkPaint.getColor());
            // paintAlpha
            drawState.setColor(SkColorSetARGB(a, a, a, a));
            // paintColor
            drawState.setBlendConstant(colorNoPreMul);
            drawState.setBlendFunc(kConstC_GrBlendCoeff, kISC_GrBlendCoeff);
        } else {
            if (0xFF == GrColorUnpackA(fPaint.getColor())) {
                drawState.setHint(GrDrawState::kVertexColorsAreOpaque_Hint, true);
            }
            // set back to normal in case we took LCD path previously.
            drawState.setBlendFunc(fPaint.getSrcBlendCoeff(), fPaint.getDstBlendCoeff());
            // We're using per-vertex color.
            SkASSERT(drawState.hasColorVertexAttribute());
        }
        int nGlyphs = fCurrVertex / kVerticesPerGlyph;
        fDrawTarget->setIndexSourceToBuffer(fContext->getQuadIndexBuffer());
        fDrawTarget->drawIndexedInstances(&drawState,
                                          kTriangles_GrPrimitiveType,
                                          nGlyphs,
                                          kVerticesPerGlyph,
                                          kIndicesPerGlyph,
                                          &fVertexBounds);
        fDrawTarget->resetVertexSource();
        fVertices = NULL;
        fTotalVertexCount -= fCurrVertex;
        fCurrVertex = 0;
        SkSafeSetNull(fCurrTexture);
        fVertexBounds.setLargestInverted();
    }
}