C++ GrDrawState::disableStage方法代码示例

void GrClipMaskManager::mergeMask(GrTexture* dstMask,
                                  GrTexture* srcMask,
                                  SkRegion::Op op,
                                  const GrIRect& dstBound,
                                  const GrIRect& srcBound) {
    GrDrawState* drawState = fGpu->drawState();
    SkMatrix oldMatrix = drawState->getViewMatrix();
    drawState->viewMatrix()->reset();

    drawState->setRenderTarget(dstMask->asRenderTarget());

    setup_boolean_blendcoeffs(drawState, op);

    SkMatrix sampleM;
    sampleM.setIDiv(srcMask->width(), srcMask->height());
    drawState->setEffect(0,
        GrTextureDomainEffect::Create(srcMask,
                                      sampleM,
                                      GrTextureDomainEffect::MakeTexelDomain(srcMask, srcBound),
                                      GrTextureDomainEffect::kDecal_WrapMode,
                                      false))->unref();
    fGpu->drawSimpleRect(SkRect::MakeFromIRect(dstBound), NULL);

    drawState->disableStage(0);
    drawState->setViewMatrix(oldMatrix);
}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
                                              GrDrawTarget* target,
                                              const GrIRect& rect) {
    GrDrawState* drawState = target->drawState();

    GrDrawState::AutoDeviceCoordDraw adcd(drawState);
    if (!adcd.succeeded()) {
        return;
    }
    enum {
        // the SW path renderer shares this stage with glyph
        // rendering (kGlyphMaskStage in GrBatchedTextContext)
        kPathMaskStage = GrPaint::kTotalStages,
    };
    GrAssert(!drawState->isStageEnabled(kPathMaskStage));
    drawState->stage(kPathMaskStage)->reset();
    drawState->createTextureEffect(kPathMaskStage, texture);
    SkScalar w = SkIntToScalar(rect.width());
    SkScalar h = SkIntToScalar(rect.height());
    GrRect maskRect = GrRect::MakeWH(w / texture->width(),
                                     h / texture->height());

    const GrRect* srcRects[GrDrawState::kNumStages] = { NULL };
    srcRects[kPathMaskStage] = &maskRect;
    GrRect dstRect = GrRect::MakeLTRB(
                            SK_Scalar1 * rect.fLeft,
                            SK_Scalar1 * rect.fTop,
                            SK_Scalar1 * rect.fRight,
                            SK_Scalar1 * rect.fBottom);
    target->drawRect(dstRect, NULL, srcRects, NULL);
    drawState->disableStage(kPathMaskStage);
}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
        GrDrawTarget* target,
        const GrIRect& rect) {
    GrDrawState* drawState = target->drawState();

    GrDrawState::AutoDeviceCoordDraw adcd(drawState);
    if (!adcd.succeeded()) {
        return;
    }
    enum {
        // the SW path renderer shares this stage with glyph
        // rendering (kGlyphMaskStage in GrTextContext)
        // && edge rendering (kEdgeEffectStage in GrContext)
        kPathMaskStage = GrPaint::kTotalStages,
    };

    GrRect dstRect = GrRect::MakeLTRB(
                         SK_Scalar1 * rect.fLeft,
                         SK_Scalar1 * rect.fTop,
                         SK_Scalar1 * rect.fRight,
                         SK_Scalar1 * rect.fBottom);

    // We want to use device coords to compute the texture coordinates. We set our matrix to be
    // equal to the view matrix followed by a translation so that the top-left of the device bounds
    // maps to 0,0, and then a scaling matrix to normalized coords. We apply this matrix to the
    // vertex positions rather than local coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
    maskMatrix.preConcat(drawState->getViewMatrix());

    GrAssert(!drawState->isStageEnabled(kPathMaskStage));
    drawState->setEffect(kPathMaskStage,
                         GrSimpleTextureEffect::Create(texture,
                                 maskMatrix,
                                 false,
                                 GrEffect::kPosition_CoordsType))->unref();

    target->drawSimpleRect(dstRect);
    drawState->disableStage(kPathMaskStage);
}

void GrClipMaskManager::drawTexture(GrTexture* target,
                                    GrTexture* texture) {
    GrDrawState* drawState = fGpu->drawState();
    GrAssert(NULL != drawState);

    // no AA here since it is encoded in the texture
    drawState->setRenderTarget(target->asRenderTarget());

    GrMatrix sampleM;
    sampleM.setIDiv(texture->width(), texture->height());

    drawState->sampler(0)->reset(sampleM);
    drawState->createTextureEffect(0, texture);

    GrRect rect = GrRect::MakeWH(SkIntToScalar(target->width()),
                                 SkIntToScalar(target->height()));

    fGpu->drawSimpleRect(rect, NULL);

    drawState->disableStage(0);
}