C++ SkBitmap::empty方法代码示例

static void test_interlaced_gif_data(skiatest::Reporter* r,
                                     void* data,
                                     size_t size) {
    SkBitmap bm;
    bool imageDecodeSuccess = decode_memory(data, size, &bm);
    REPORTER_ASSERT(r, imageDecodeSuccess);
    REPORTER_ASSERT(r, bm.width() == 9);
    REPORTER_ASSERT(r, bm.height() == 9);
    REPORTER_ASSERT(r, !(bm.empty()));
    if (!(bm.empty())) {
        REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xffff0000);
        REPORTER_ASSERT(r, bm.getColor(1, 0) == 0xffffff00);
        REPORTER_ASSERT(r, bm.getColor(2, 0) == 0xff00ffff);

        REPORTER_ASSERT(r, bm.getColor(0, 2) == 0xffffffff);
        REPORTER_ASSERT(r, bm.getColor(1, 2) == 0xffff00ff);
        REPORTER_ASSERT(r, bm.getColor(2, 2) == 0xff0000ff);

        REPORTER_ASSERT(r, bm.getColor(0, 4) == 0xff808080);
        REPORTER_ASSERT(r, bm.getColor(1, 4) == 0xff000000);
        REPORTER_ASSERT(r, bm.getColor(2, 4) == 0xff00ff00);

        REPORTER_ASSERT(r, bm.getColor(0, 6) == 0xffff0000);
        REPORTER_ASSERT(r, bm.getColor(1, 6) == 0xffffff00);
        REPORTER_ASSERT(r, bm.getColor(2, 6) == 0xff00ffff);

        REPORTER_ASSERT(r, bm.getColor(0, 8) == 0xffffffff);
        REPORTER_ASSERT(r, bm.getColor(1, 8) == 0xffff00ff);
        REPORTER_ASSERT(r, bm.getColor(2, 8) == 0xff0000ff);
    }
}

static void test_gif_data_no_colormap(skiatest::Reporter* r,
                                      void* data,
                                      size_t size) {
    SkBitmap bm;
    bool imageDecodeSuccess = decode_memory(data, size, &bm);
    REPORTER_ASSERT(r, imageDecodeSuccess);
    REPORTER_ASSERT(r, bm.width() == 1);
    REPORTER_ASSERT(r, bm.height() == 1);
    REPORTER_ASSERT(r, !(bm.empty()));
    if (!(bm.empty())) {
        REPORTER_ASSERT(r, bm.getColor(0, 0) == 0xFF000000);
    }
}

/**
   This function tests three differently encoded images against the
   original bitmap */
static void test_three_encodings(skiatest::Reporter* reporter,
                                 InstallEncoded install) {
    SkBitmap original;
    make_test_image(&original);
    REPORTER_ASSERT(reporter, !original.empty());
    REPORTER_ASSERT(reporter, !original.isNull());
    if (original.empty() || original.isNull()) {
        return;
    }
    static const SkImageEncoder::Type types[] = {
        SkImageEncoder::kPNG_Type,
        SkImageEncoder::kJPEG_Type,
        SkImageEncoder::kWEBP_Type
    };
    for (size_t i = 0; i < SK_ARRAY_COUNT(types); i++) {
        SkImageEncoder::Type type = types[i];
        SkAutoDataUnref encoded(create_data_from_bitmap(original, type));
        REPORTER_ASSERT(reporter, encoded.get() != NULL);
        if (NULL == encoded.get()) {
            continue;
        }
        SkBitmap lazy;
        bool installSuccess = install(encoded.get(), &lazy);
        REPORTER_ASSERT(reporter, installSuccess);
        if (!installSuccess) {
            continue;
        }
        REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
        {
            SkAutoLockPixels autoLockPixels(lazy);  // now pixels are good.
            REPORTER_ASSERT(reporter, lazy.getPixels());
            if (NULL == lazy.getPixels()) {
                continue;
            }
        }
        // pixels should be gone!
        REPORTER_ASSERT(reporter, NULL == lazy.getPixels());
        {
            SkAutoLockPixels autoLockPixels(lazy);  // now pixels are good.
            REPORTER_ASSERT(reporter, lazy.getPixels());
            if (NULL == lazy.getPixels()) {
                continue;
            }
        }
        bool comparePixels = (SkImageEncoder::kPNG_Type == type);
        compare_bitmaps(reporter, original, lazy, comparePixels);
    }
}

static SkCanvas* create_canvas_from_canvas_layer(const SkCanvasLayerState& layerState) {
    SkASSERT(kRaster_CanvasBackend == layerState.type);

    SkBitmap bitmap;
    SkColorType colorType =
        layerState.raster.config == kARGB_8888_RasterConfig ? kN32_SkColorType :
        layerState.raster.config == kRGB_565_RasterConfig ? kRGB_565_SkColorType :
        kUnknown_SkColorType;

    if (colorType == kUnknown_SkColorType) {
        return nullptr;
    }

    bitmap.installPixels(SkImageInfo::Make(layerState.width, layerState.height,
                                           colorType, kPremul_SkAlphaType),
                         layerState.raster.pixels, (size_t) layerState.raster.rowBytes);

    SkASSERT(!bitmap.empty());
    SkASSERT(!bitmap.isNull());

    SkAutoTUnref<SkCanvas> canvas(new SkCanvas(bitmap));

    // setup the matrix and clip
    setup_canvas_from_MC_state(layerState.mcState, canvas.get());

    return canvas.release();
}

sk_sp<SkSpecialImage> SkSpecialImage::makeTextureImage(GrContext* context) {
#if SK_SUPPORT_GPU
    if (!context) {
        return nullptr;
    }
    if (GrTexture* peek = as_SIB(this)->onPeekTexture()) {
        return peek->getContext() == context ? sk_sp<SkSpecialImage>(SkRef(this)) : nullptr;
    }

    SkBitmap bmp;
    if (!this->internal_getBM(&bmp)) {
        return nullptr;
    }

    if (bmp.empty()) {
        return SkSpecialImage::MakeFromRaster(SkIRect::MakeEmpty(), bmp, &this->props());
    }

    SkAutoTUnref<GrTexture> resultTex(
        GrRefCachedBitmapTexture(context, bmp, GrTextureParams::ClampNoFilter()));
    if (!resultTex) {
        return nullptr;
    }

    SkAlphaType at = this->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType;

    return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(resultTex->width(), resultTex->height()),
                                       this->uniqueID(),
                                       resultTex, &this->props(), at);
#else
    return nullptr;
#endif
}

/**
 * First, make sure that writing an 8-bit RGBA KTX file and then
 * reading it produces the same bitmap.
 */
DEF_TEST(KtxReadWrite, reporter) {

    // Random number generator with explicit seed for reproducibility
    SkRandom rand(0x1005cbad);

    SkBitmap bm8888;
    bool pixelsAllocated = bm8888.allocN32Pixels(128, 128);
    REPORTER_ASSERT(reporter, pixelsAllocated);

    uint8_t *pixels = reinterpret_cast<uint8_t*>(bm8888.getPixels());
    REPORTER_ASSERT(reporter, NULL != pixels);

    if (NULL == pixels) {
        return;
    }
    
    uint8_t *row = pixels;
    for (int y = 0; y < bm8888.height(); ++y) {        
        for (int x = 0; x < bm8888.width(); ++x) {
            uint8_t a = rand.nextRangeU(0, 255);
            uint8_t r = rand.nextRangeU(0, 255);
            uint8_t g = rand.nextRangeU(0, 255);
            uint8_t b = rand.nextRangeU(0, 255);

            SkPMColor &pixel = *(reinterpret_cast<SkPMColor*>(row + x*sizeof(SkPMColor)));
            pixel = SkPreMultiplyARGB(a, r, g, b);
        }
        row += bm8888.rowBytes();
    }
    REPORTER_ASSERT(reporter, !(bm8888.empty()));

    SkAutoDataUnref encodedData(SkImageEncoder::EncodeData(bm8888, SkImageEncoder::kKTX_Type, 0));
    REPORTER_ASSERT(reporter, NULL != encodedData);

    SkAutoTUnref<SkMemoryStream> stream(SkNEW_ARGS(SkMemoryStream, (encodedData)));
    REPORTER_ASSERT(reporter, NULL != stream);

    SkBitmap decodedBitmap;
    bool imageDecodeSuccess = SkImageDecoder::DecodeStream(stream, &decodedBitmap);
    REPORTER_ASSERT(reporter, imageDecodeSuccess);

    REPORTER_ASSERT(reporter, decodedBitmap.colorType() == bm8888.colorType());
    REPORTER_ASSERT(reporter, decodedBitmap.alphaType() == bm8888.alphaType());
    REPORTER_ASSERT(reporter, decodedBitmap.width() == bm8888.width());
    REPORTER_ASSERT(reporter, decodedBitmap.height() == bm8888.height());
    REPORTER_ASSERT(reporter, !(decodedBitmap.empty()));

    uint8_t *decodedPixels = reinterpret_cast<uint8_t*>(decodedBitmap.getPixels());
    REPORTER_ASSERT(reporter, NULL != decodedPixels);
    REPORTER_ASSERT(reporter, decodedBitmap.getSize() == bm8888.getSize());

    if (NULL == decodedPixels) {
        return;
    }

    REPORTER_ASSERT(reporter, memcmp(decodedPixels, pixels, decodedBitmap.getSize()) == 0);
}

static void test_gif_data_dims(skiatest::Reporter* r, void* data, size_t size, int width,
        int height) {
    SkBitmap bm;
    bool imageDecodeSuccess = decode_memory(data, size, &bm);
    REPORTER_ASSERT(r, imageDecodeSuccess);
    REPORTER_ASSERT(r, bm.width() == width);
    REPORTER_ASSERT(r, bm.height() == height);
    REPORTER_ASSERT(r, !(bm.empty()));
}

/**
 * Next test is to see whether or not reading an unpremultiplied KTX file accurately
 * creates a premultiplied buffer...
 */
DEF_TEST(KtxReadUnpremul, reporter) {

    static const uint8_t kHalfWhiteKTX[] = {
        0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, // First twelve bytes is magic
        0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A, // KTX identifier string
        0x01, 0x02, 0x03, 0x04, // Then magic endian specifier
        0x01, 0x14, 0x00, 0x00, // uint32_t fGLType;
        0x01, 0x00, 0x00, 0x00, // uint32_t fGLTypeSize;
        0x08, 0x19, 0x00, 0x00, // uint32_t fGLFormat;
        0x58, 0x80, 0x00, 0x00, // uint32_t fGLInternalFormat;
        0x08, 0x19, 0x00, 0x00, // uint32_t fGLBaseInternalFormat;
        0x02, 0x00, 0x00, 0x00, // uint32_t fPixelWidth;
        0x02, 0x00, 0x00, 0x00, // uint32_t fPixelHeight;
        0x00, 0x00, 0x00, 0x00, // uint32_t fPixelDepth;
        0x00, 0x00, 0x00, 0x00, // uint32_t fNumberOfArrayElements;
        0x01, 0x00, 0x00, 0x00, // uint32_t fNumberOfFaces;
        0x01, 0x00, 0x00, 0x00, // uint32_t fNumberOfMipmapLevels;
        0x00, 0x00, 0x00, 0x00, // uint32_t fBytesOfKeyValueData;
        0x10, 0x00, 0x00, 0x00, // image size: 2x2 image of RGBA = 4 * 4 = 16 bytes
        0xFF, 0xFF, 0xFF, 0x80, // Pixel 1
        0xFF, 0xFF, 0xFF, 0x80, // Pixel 2
        0xFF, 0xFF, 0xFF, 0x80, // Pixel 3
        0xFF, 0xFF, 0xFF, 0x80};// Pixel 4

    SkAutoTDelete<SkMemoryStream> stream(new SkMemoryStream(kHalfWhiteKTX, sizeof(kHalfWhiteKTX)));
    REPORTER_ASSERT(reporter, stream);

    SkBitmap decodedBitmap;
    bool imageDecodeSuccess = SkImageDecoder::DecodeStream(stream, &decodedBitmap);
    if (!imageDecodeSuccess) {
        ERRORF(reporter, "failed to decode the KTX stream");
        return;
    }

    REPORTER_ASSERT(reporter, decodedBitmap.colorType() == kN32_SkColorType);
    REPORTER_ASSERT(reporter, decodedBitmap.alphaType() == kPremul_SkAlphaType);
    REPORTER_ASSERT(reporter, decodedBitmap.width() == 2);
    REPORTER_ASSERT(reporter, decodedBitmap.height() == 2);
    REPORTER_ASSERT(reporter, !(decodedBitmap.empty()));

    uint8_t *decodedPixels = reinterpret_cast<uint8_t*>(decodedBitmap.getPixels());
    REPORTER_ASSERT(reporter, decodedPixels);

    uint8_t *row = decodedPixels;
    for (int j = 0; j < decodedBitmap.height(); ++j) {
        for (int i = 0; i < decodedBitmap.width(); ++i) {
            SkPMColor pixel = *(reinterpret_cast<SkPMColor*>(row + i*sizeof(SkPMColor)));
            REPORTER_ASSERT(reporter, SkPreMultiplyARGB(0x80, 0xFF, 0xFF, 0xFF) == pixel);
        }
        row += decodedBitmap.rowBytes();
    }
}

static void compare_bitmaps(skiatest::Reporter* reporter,
                            const SkBitmap& b1, const SkBitmap& b2,
                            bool pixelPerfect = true) {
    REPORTER_ASSERT(reporter, b1.empty() == b2.empty());
    REPORTER_ASSERT(reporter, b1.width() == b2.width());
    REPORTER_ASSERT(reporter, b1.height() == b2.height());
    REPORTER_ASSERT(reporter, b1.isNull() == b2.isNull());
    SkAutoLockPixels autoLockPixels1(b1);
    SkAutoLockPixels autoLockPixels2(b2);
    REPORTER_ASSERT(reporter, b1.isNull() == b2.isNull());
    if (b1.isNull() || b1.empty()) {
        return;
    }
    REPORTER_ASSERT(reporter, b1.getPixels());
    REPORTER_ASSERT(reporter, b2.getPixels());
    if ((!(b1.getPixels())) || (!(b2.getPixels()))) {
        return;
    }
    if ((b1.width() != b2.width()) ||
        (b1.height() != b2.height())) {
        return;
    }
    if (!pixelPerfect) {
        return;
    }

    int pixelErrors = 0;
    for (int y = 0; y < b2.height(); ++y) {
        for (int x = 0; x < b2.width(); ++x) {
            if (b1.getColor(x, y) != b2.getColor(x, y)) {
                ++pixelErrors;
            }
        }
    }
    REPORTER_ASSERT(reporter, 0 == pixelErrors);
}

sk_sp<SkSpecialImage> SkSpecialImage::makeTextureImage(GrContext* context) {
#if SK_SUPPORT_GPU
    if (!context) {
        return nullptr;
    }
    if (GrContext* curContext = as_SIB(this)->onGetContext()) {
        return curContext == context ? sk_sp<SkSpecialImage>(SkRef(this)) : nullptr;
    }

    auto proxyProvider = context->contextPriv().proxyProvider();
    SkBitmap bmp;
    // At this point, we are definitely not texture-backed, so we must be raster or generator
    // backed. If we remove the special-wrapping-an-image subclass, we may be able to assert that
    // we are strictly raster-backed (i.e. generator images become raster when they are specialized)
    // in which case getROPixels could turn into peekPixels...
    if (!this->getROPixels(&bmp)) {
        return nullptr;
    }

    if (bmp.empty()) {
        return SkSpecialImage::MakeFromRaster(SkIRect::MakeEmpty(), bmp, &this->props());
    }

    // TODO: this is a tight copy of 'bmp' but it doesn't have to be (given SkSpecialImage's
    // semantics). Since this is cached though we would have to bake the fit into the cache key.
    sk_sp<GrTextureProxy> proxy = GrMakeCachedBitmapProxy(proxyProvider, bmp);
    if (!proxy) {
        return nullptr;
    }

    const SkIRect rect = SkIRect::MakeWH(proxy->width(), proxy->height());

    // GrMakeCachedBitmapProxy has uploaded only the specified subset of 'bmp' so we need not
    // bother with SkBitmap::getSubset
    return SkSpecialImage::MakeDeferredFromGpu(context,
                                               rect,
                                               this->uniqueID(),
                                               std::move(proxy),
                                               sk_ref_sp(this->getColorSpace()),
                                               &this->props(),
                                               this->alphaType());
#else
    return nullptr;
#endif
}

void svg_renderer::update_drawing (const QTransform &transform, const QRectF &rect_to_update, int cache_object_type)
{
  m_cache->lock ();
  DO_ON_EXIT (m_cache->unlock ());

  double cache_zoom_x = m_cache->zoom_x ();
  double cache_zoom_y = m_cache->zoom_y ();
  double cur_zoom_x = transform.m11 ();
  double cur_zoom_y = transform.m22 ();
  QRectF rect_to_draw = rect_to_update;
  QTransform real_transform = transform;

  SkBitmap bitmap;
  bitmap.setConfig (SkBitmap::kARGB_8888_Config, rect_to_draw.width (), rect_to_draw.height ());
  bitmap.allocPixels ();
  SkBitmapDevice device (bitmap);
  SkCanvas canvas (&device);

  if (!are_equal (cache_zoom_x, cur_zoom_x) || !are_equal (cache_zoom_y, cur_zoom_y))
    {
      QTransform scale_transform = QTransform::fromScale (cache_zoom_x / cur_zoom_x, cache_zoom_y / cur_zoom_y);
      real_transform = real_transform * scale_transform;
      canvas.setMatrix (qt2skia::matrix (scale_transform.inverted ()));
      rect_to_draw = scale_transform.mapRect (rect_to_draw);
    }

  canvas.drawColor (SK_ColorTRANSPARENT, SkXfermode::kSrc_Mode);

  pair<render_cache_id, render_cache_id> it_pair = render_cache_id::get_id_for_pixel_rect (real_transform, rect_to_draw, cache_object_type);

  for (int x = it_pair.first.x (); x <= it_pair.second.x (); x++)
    for (int y = it_pair.first.y (); y <= it_pair.second.y (); y++)
      {
        render_cache_id cur_id (x, y, cache_object_type);
        SkBitmap bitmap = m_cache->bitmap (cur_id);
        if (bitmap.empty ())
          continue;

        QRectF pixel_rect = cur_id.pixel_rect (real_transform);
        canvas.drawBitmap (bitmap, SkFloatToScalar (pixel_rect.x ()), SkFloatToScalar (pixel_rect.y ()));
      }

  m_cache->set_current_screen (bitmap, cache_object_type);
}

/**
 *  This test contains basic sanity checks concerning bitmaps.
 */
DEF_TEST(Bitmap, reporter) {
    // Zero-sized bitmaps are allowed
    for (int width = 0; width < 2; ++width) {
        for (int height = 0; height < 2; ++height) {
            SkBitmap bm;
            bool setConf = bm.setInfo(SkImageInfo::MakeN32Premul(width, height));
            REPORTER_ASSERT(reporter, setConf);
            if (setConf) {
                bm.allocPixels();
            }
            REPORTER_ASSERT(reporter, SkToBool(width & height) != bm.empty());
        }
    }

    test_bigwidth(reporter);
    test_allocpixels(reporter);
    test_bigalloc(reporter);
    test_peekpixels(reporter);
}

sk_sp<SkSpecialImage> SkSpecialImage::makeTextureImage(GrContext* context) {
#if SK_SUPPORT_GPU
    if (!context) {
        return nullptr;
    }
    if (GrTexture* peek = as_SIB(this)->onPeekTexture()) {
        return peek->getContext() == context ? sk_sp<SkSpecialImage>(SkRef(this)) : nullptr;
    }

    SkBitmap bmp;
    // At this point, we are definitely not texture-backed, so we must be raster or generator
    // backed. If we remove the special-wrapping-an-image subclass, we may be able to assert that
    // we are strictly raster-backed (i.e. generator images become raster when they are specialized)
    // in which case getROPixels could turn into peekPixels...
    if (!this->getROPixels(&bmp)) {
        return nullptr;
    }

    if (bmp.empty()) {
        return SkSpecialImage::MakeFromRaster(SkIRect::MakeEmpty(), bmp, &this->props());
    }

    sk_sp<GrTexture> resultTex(GrRefCachedBitmapTexture(context,
                               bmp,
                               GrTextureParams::ClampNoFilter(),
                               SkSourceGammaTreatment::kRespect));
    if (!resultTex) {
        return nullptr;
    }

    SkAlphaType at = this->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType;

    return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(resultTex->width(), resultTex->height()),
                                       this->uniqueID(),
                                       resultTex, sk_ref_sp(this->getColorSpace()), &this->props(),
                                       at);
#else
    return nullptr;
#endif
}