Change image document zooming logic.

third_party/WebKit/Source/core/html/ImageDocumentTest.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/html/ImageDocument.h"
+
+#include "core/dom/Document.h"
+#include "core/dom/DocumentParser.h"
+#include "core/loader/EmptyClients.h"
+#include "core/testing/DummyPageHolder.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+namespace {
+
+// An image of size 50x50.
+Vector<unsigned char> jpegImage()
+{
+    Vector<unsigned char> jpeg;
+
+    static const unsigned char data[] = {
+        0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01, 0x01, 0x01, 0x00, 0x48,
+        0x00, 0x48, 0x00, 0x00, 0xff, 0xdb, 0x00, 0x43, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xdb, 0x00, 0x43, 0x01, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc0,
+        0x00, 0x11, 0x08, 0x00, 0x32, 0x00, 0x32, 0x03, 0x01, 0x22, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11,
+        0x01, 0xff, 0xc4, 0x00, 0x14, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xc4, 0x00, 0x14, 0x10, 0x01, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xc4, 0x00,
+        0x15, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x02, 0xff, 0xc4, 0x00, 0x14, 0x11, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01,
+        0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00, 0x00, 0x94, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+        0x03, 0xff, 0xd9
+    };
+
+    jpeg.append(data, sizeof(data));
+    return jpeg;
+}
+
+}
+
+class WindowToViewportScalingChromeClient : public EmptyChromeClient {
+public:
+    WindowToViewportScalingChromeClient()
+        : EmptyChromeClient()
+        , m_scaleFactor(1.f)
+    {
+    }
+
+    void setScalingFactor(float s) { m_scaleFactor = s; }
+    float windowToViewportScalar(const float s) const override { return s * m_scaleFactor; }
+
+private:
+    float m_scaleFactor;
+};
+
+class ImageDocumentTest : public ::testing::Test {
+protected:
+    void TearDown() override
+    {
+        ThreadState::current()->collectAllGarbage();
+    }
+
+    void createDocumentWithoutLoadingImage(int viewWidth, int viewHeight);
+    void createDocument(int viewWidth, int viewHeight);
+    void loadImage();
+
+    ImageDocument& document() const;
+
+    int imageWidth() const { return document().imageElement()->width(); }
+    int imageHeight() const { return document().imageElement()->height(); }
+
+    void setPageZoom(float);
+    void setWindowToViewportScalingFactor(float);
+
+private:
+    Persistent<WindowToViewportScalingChromeClient> m_chromeClient;
+    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
+};
+
+void ImageDocumentTest::createDocumentWithoutLoadingImage(int viewWidth, int viewHeight)
+{
+    Page::PageClients pageClients;
+    fillWithEmptyClients(pageClients);
+    m_chromeClient = new WindowToViewportScalingChromeClient();
+    pageClients.chromeClient = m_chromeClient;
+    m_dummyPageHolder = DummyPageHolder::create(IntSize(viewWidth, viewHeight), &pageClients);
+
+    LocalFrame& frame = m_dummyPageHolder->frame();
+    frame.document()->shutdown();
+    DocumentInit init(KURL(), &frame);
+    frame.localDOMWindow()->installNewDocument("image/jpeg", init);
+}
+
+void ImageDocumentTest::createDocument(int viewWidth, int viewHeight)
+{
+    createDocumentWithoutLoadingImage(viewWidth, viewHeight);
+    loadImage();
+}
+
+ImageDocument& ImageDocumentTest::document() const
+{
+    Document* document = m_dummyPageHolder->frame().domWindow()->document();
+    ImageDocument* imageDocument = static_cast<ImageDocument*>(document);
+    return *imageDocument;
+}
+
+void ImageDocumentTest::loadImage()
+{
+    DocumentParser* parser = document().implicitOpen(ParserSynchronizationPolicy::ForceSynchronousParsing);
+    const Vector<unsigned char>& data = jpegImage();
+    parser->appendBytes(reinterpret_cast<const char*>(data.data()), data.size());
+    parser->finish();
+}
+
+void ImageDocumentTest::setPageZoom(float factor)
+{
+    m_dummyPageHolder->frame().setPageZoomFactor(factor);
+}
+
+void ImageDocumentTest::setWindowToViewportScalingFactor(float factor)
+{
+    m_chromeClient->setScalingFactor(factor);
+}
+
+TEST_F(ImageDocumentTest, ImageLoad)
+{
+    createDocument(50, 50);
+    EXPECT_EQ(50, imageWidth());
+    EXPECT_EQ(50, imageHeight());
+}
+
+TEST_F(ImageDocumentTest, LargeImageScalesDown)
+{
+    createDocument(25, 30);
+    EXPECT_EQ(25, imageWidth());
+    EXPECT_EQ(25, imageHeight());
+
+    createDocument(35, 20);
+    EXPECT_EQ(20, imageWidth());
+    EXPECT_EQ(20, imageHeight());
+}
+
+TEST_F(ImageDocumentTest, RestoreImageOnClick)
+{
+    createDocument(30, 40);
+    document().imageClicked(4, 4);
+    EXPECT_EQ(50, imageWidth());
+    EXPECT_EQ(50, imageHeight());
+}
+
+TEST_F(ImageDocumentTest, InitialZoomDoesNotAffectScreenFit)
+{
+    createDocumentWithoutLoadingImage(20, 10);
+    setPageZoom(2.f);
+    loadImage();
+    EXPECT_EQ(10, imageWidth());
+    EXPECT_EQ(10, imageHeight());
+    document().imageClicked(4, 4);
+    EXPECT_EQ(50, imageWidth());
+    EXPECT_EQ(50, imageHeight());
+}
+
+TEST_F(ImageDocumentTest, ZoomingDoesNotChangeRelativeSize)
+{
+    createDocument(75, 75);
+    setPageZoom(0.5f);
+    document().windowSizeChanged();
+    EXPECT_EQ(50, imageWidth());
+    EXPECT_EQ(50, imageHeight());
+    setPageZoom(2.f);
+    document().windowSizeChanged();
+    EXPECT_EQ(50, imageWidth());
+    EXPECT_EQ(50, imageHeight());
+}
+
+TEST_F(ImageDocumentTest, ImageScalesDownWithDsf)
+{
+    createDocumentWithoutLoadingImage(20, 30);
+    setWindowToViewportScalingFactor(2.f);
+    loadImage();
+    EXPECT_EQ(10, imageWidth());
+    EXPECT_EQ(10, imageHeight());
+}
+
+} // namespace blink