C++ SkRect::setLargestInverted方法代码示例

void GrAtlasTextBatch::onPrepareDraws(Target* target) const {
    // if we have RGB, then we won't have any SkShaders so no need to use a localmatrix.
    // TODO actually only invert if we don't have RGBA
    SkMatrix localMatrix;
    if (this->usesLocalCoords() && !this->viewMatrix().invert(&localMatrix)) {
        SkDebugf("Cannot invert viewmatrix\n");
        return;
    }

    GrTexture* texture = fFontCache->getTexture(this->maskFormat());
    if (!texture) {
        SkDebugf("Could not allocate backing texture for atlas\n");
        return;
    }

    GrMaskFormat maskFormat = this->maskFormat();

    FlushInfo flushInfo;
    if (this->usesDistanceFields()) {
        flushInfo.fGeometryProcessor =
            this->setupDfProcessor(this->viewMatrix(), fFilteredColor, this->color(), texture);
    } else {
        GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
        flushInfo.fGeometryProcessor = GrBitmapTextGeoProc::Make(this->color(),
                                                                 texture,
                                                                 params,
                                                                 maskFormat,
                                                                 localMatrix,
                                                                 this->usesLocalCoords());
    }

    flushInfo.fGlyphsToFlush = 0;
    size_t vertexStride = flushInfo.fGeometryProcessor->getVertexStride();
    SkASSERT(vertexStride == GrAtlasTextBlob::GetVertexStride(maskFormat));

    int glyphCount = this->numGlyphs();
    const GrBuffer* vertexBuffer;

    void* vertices = target->makeVertexSpace(vertexStride,
                                             glyphCount * kVerticesPerGlyph,
                                             &vertexBuffer,
                                             &flushInfo.fVertexOffset);
    flushInfo.fVertexBuffer.reset(SkRef(vertexBuffer));
    flushInfo.fIndexBuffer.reset(target->resourceProvider()->refQuadIndexBuffer());
    if (!vertices || !flushInfo.fVertexBuffer) {
        SkDebugf("Could not allocate vertices\n");
        return;
    }

    unsigned char* currVertex = reinterpret_cast<unsigned char*>(vertices);

    GrBlobRegenHelper helper(this, target, &flushInfo);
    SkAutoGlyphCache glyphCache;
    for (int i = 0; i < fGeoCount; i++) {
        const Geometry& args = fGeoData[i];
        Blob* blob = args.fBlob;
        size_t byteCount;
        void* blobVertices;
        int subRunGlyphCount;
        blob->regenInBatch(target, fFontCache, &helper, args.fRun, args.fSubRun, &glyphCache,
                           vertexStride, args.fViewMatrix, args.fX, args.fY, args.fColor,
                           &blobVertices, &byteCount, &subRunGlyphCount);

        // now copy all vertices
        memcpy(currVertex, blobVertices, byteCount);

#ifdef SK_DEBUG
        // bounds sanity check
        SkRect rect;
        rect.setLargestInverted();
        SkPoint* vertex = (SkPoint*) ((char*)blobVertices);
        rect.growToInclude(vertex, vertexStride, kVerticesPerGlyph * subRunGlyphCount);

        if (this->usesDistanceFields()) {
            args.fViewMatrix.mapRect(&rect);
        }
        // Allow for small numerical error in the bounds.
        SkRect bounds = this->bounds();
        bounds.outset(0.001f, 0.001f);
        SkASSERT(bounds.contains(rect));
#endif

        currVertex += byteCount;
    }

    this->flush(target, &flushInfo);
}

GrDrawAtlasBatch::GrDrawAtlasBatch(GrColor color, const SkMatrix& viewMatrix, int spriteCount,
                                   const SkRSXform* xforms, const SkRect* rects,
                                   const SkColor* colors)
        : INHERITED(ClassID()) {
    SkASSERT(xforms);
    SkASSERT(rects);

    fViewMatrix = viewMatrix;
    Geometry& installedGeo = fGeoData.push_back();
    installedGeo.fColor = color;

    // Figure out stride and offsets
    // Order within the vertex is: position [color] texCoord
    size_t texOffset = sizeof(SkPoint);
    size_t vertexStride = 2*sizeof(SkPoint);
    fHasColors = SkToBool(colors);
    if (colors) {
        texOffset += sizeof(GrColor);
        vertexStride += sizeof(GrColor);
    }

    // Compute buffer size and alloc buffer
    fQuadCount = spriteCount;
    int allocSize = static_cast<int>(4*vertexStride*spriteCount);
    installedGeo.fVerts.reset(allocSize);
    uint8_t* currVertex = installedGeo.fVerts.begin();

    SkRect bounds;
    bounds.setLargestInverted();
    int paintAlpha = GrColorUnpackA(installedGeo.fColor);
    for (int spriteIndex = 0; spriteIndex < spriteCount; ++spriteIndex) {
        // Transform rect
        SkPoint quad[4];
        const SkRect& currRect = rects[spriteIndex];
        xforms[spriteIndex].toQuad(currRect.width(), currRect.height(), quad);

        // Copy colors if necessary
        if (colors) {
            // convert to GrColor
            SkColor color = colors[spriteIndex];
            if (paintAlpha != 255) {
                color = SkColorSetA(color, SkMulDiv255Round(SkColorGetA(color), paintAlpha));
            }
            GrColor grColor = SkColorToPremulGrColor(color);

            *(reinterpret_cast<GrColor*>(currVertex+sizeof(SkPoint))) = grColor;
            *(reinterpret_cast<GrColor*>(currVertex+vertexStride+sizeof(SkPoint))) = grColor;
            *(reinterpret_cast<GrColor*>(currVertex+2*vertexStride+sizeof(SkPoint))) = grColor;
            *(reinterpret_cast<GrColor*>(currVertex+3*vertexStride+sizeof(SkPoint))) = grColor;
        }

        // Copy position and uv to verts
        *(reinterpret_cast<SkPoint*>(currVertex)) = quad[0];
        *(reinterpret_cast<SkPoint*>(currVertex+texOffset)) = SkPoint::Make(currRect.fLeft,
                                                                            currRect.fTop);
        bounds.growToInclude(quad[0].fX, quad[0].fY);
        currVertex += vertexStride;

        *(reinterpret_cast<SkPoint*>(currVertex)) = quad[1];
        *(reinterpret_cast<SkPoint*>(currVertex+texOffset)) = SkPoint::Make(currRect.fRight,
                                                                            currRect.fTop);
        bounds.growToInclude(quad[1].fX, quad[1].fY);
        currVertex += vertexStride;

        *(reinterpret_cast<SkPoint*>(currVertex)) = quad[2];
        *(reinterpret_cast<SkPoint*>(currVertex+texOffset)) = SkPoint::Make(currRect.fRight,
                                                                            currRect.fBottom);
        bounds.growToInclude(quad[2].fX, quad[2].fY);
        currVertex += vertexStride;

        *(reinterpret_cast<SkPoint*>(currVertex)) = quad[3];
        *(reinterpret_cast<SkPoint*>(currVertex+texOffset)) = SkPoint::Make(currRect.fLeft,
                                                                            currRect.fBottom);
        bounds.growToInclude(quad[3].fX, quad[3].fY);
        currVertex += vertexStride;
    }

    this->setTransformedBounds(bounds, viewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
}

void GrAtlasTextBatch::onPrepareDraws(Target* target) const {
    // if we have RGB, then we won't have any SkShaders so no need to use a localmatrix.
    // TODO actually only invert if we don't have RGBA
    SkMatrix localMatrix;
    if (this->usesLocalCoords() && !this->viewMatrix().invert(&localMatrix)) {
        SkDebugf("Cannot invert viewmatrix\n");
        return;
    }

    GrTexture* texture = fFontCache->getTexture(this->maskFormat());
    if (!texture) {
        SkDebugf("Could not allocate backing texture for atlas\n");
        return;
    }

    GrMaskFormat maskFormat = this->maskFormat();

    SkAutoTUnref<const GrGeometryProcessor> gp;
    if (this->usesDistanceFields()) {
        gp.reset(this->setupDfProcessor(this->viewMatrix(), fFilteredColor, this->color(),
                                        texture));
    } else {
        GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
        gp.reset(GrBitmapTextGeoProc::Create(this->color(),
                                             texture,
                                             params,
                                             maskFormat,
                                             localMatrix,
                                             this->usesLocalCoords()));
    }

    FlushInfo flushInfo;
    flushInfo.fGlyphsToFlush = 0;
    size_t vertexStride = gp->getVertexStride();
    SkASSERT(vertexStride == GrAtlasTextBlob::GetVertexStride(maskFormat));

    target->initDraw(gp);

    int glyphCount = this->numGlyphs();
    const GrBuffer* vertexBuffer;

    void* vertices = target->makeVertexSpace(vertexStride,
                                             glyphCount * kVerticesPerGlyph,
                                             &vertexBuffer,
                                             &flushInfo.fVertexOffset);
    flushInfo.fVertexBuffer.reset(SkRef(vertexBuffer));
    flushInfo.fIndexBuffer.reset(target->resourceProvider()->refQuadIndexBuffer());
    if (!vertices || !flushInfo.fVertexBuffer) {
        SkDebugf("Could not allocate vertices\n");
        return;
    }

    unsigned char* currVertex = reinterpret_cast<unsigned char*>(vertices);

    // We cache some values to avoid going to the glyphcache for the same fontScaler twice
    // in a row
    const SkDescriptor* desc = nullptr;
    SkGlyphCache* cache = nullptr;
    GrFontScaler* scaler = nullptr;
    SkTypeface* typeface = nullptr;

    GrBlobRegenHelper helper(this, target, &flushInfo, gp);

    for (int i = 0; i < fGeoCount; i++) {
        const Geometry& args = fGeoData[i];
        Blob* blob = args.fBlob;
        size_t byteCount;
        void* blobVertices;
        int subRunGlyphCount;
        blob->regenInBatch(target, fFontCache, &helper, args.fRun, args.fSubRun, &cache,
                           &typeface, &scaler, &desc, vertexStride, args.fViewMatrix, args.fX,
                           args.fY, args.fColor, &blobVertices, &byteCount, &subRunGlyphCount);

        // now copy all vertices
        memcpy(currVertex, blobVertices, byteCount);

#ifdef SK_DEBUG
        // bounds sanity check
        SkRect rect;
        rect.setLargestInverted();
        SkPoint* vertex = (SkPoint*) ((char*)blobVertices);
        rect.growToInclude(vertex, vertexStride, kVerticesPerGlyph * subRunGlyphCount);

        if (this->usesDistanceFields()) {
            args.fViewMatrix.mapRect(&rect);
        }
        SkASSERT(fBounds.contains(rect));
#endif

        currVertex += byteCount;
    }

    // Make sure to attach the last cache if applicable
    if (cache) {
        SkGlyphCache::AttachCache(cache);
    }
    this->flush(target, &flushInfo);
}