fix box shadows

We need to apply the context transform to the shadow before
rendering it.  There's also a weird case where we have to
flip the y offset if we're not applying the transform.  I'm
not sure why this is necessary, but it allows us to pass
canvas-shadow tests.

BUG=5503

Review URL: http://codereview.chromium.org/14125

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@7002 0039d316-1c4b-4281-b951-d872f2087c98

14 files changed, 335 insertions, 322 deletions

diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.checksum b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.checksum
index 1d77c31..884b58e 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.checksum
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.checksum
@@ -1 +1 @@
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diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.png b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.png
index 8be3aed..fe220f9 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.png
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.png
diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.txt b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.txt
index fe7a86e..c533296 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.txt
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/box-shadow/border-radius-big-expected.txt
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diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.checksum b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.checksum
index c3edbee..878c6e1 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.checksum
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.checksum
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diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.png b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.png
index 1b101a7..046357e 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.png
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.png
diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.txt b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.txt
index ccc55f9..9aea841 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-dynamic-expected.txt
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diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.checksum b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.checksum
index 67b6953..d2477ad 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.checksum
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diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.png b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.png
index 416d913..4ba60eb 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.png
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.png
diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.txt b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.txt
index d68580e..adee5c2 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-h-expected.txt
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diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.checksum b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.checksum
index 67b6953..d2477ad 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.checksum
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.checksum
@@ -1 +1 @@
-ad189a9dccf4e425c05f92160ee71d42
\ No newline at end of file
+f3db54e8a0de8f7d888fd115c4041097
\ No newline at end of file
diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.png b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.png
index 416d913..4ba60eb 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.png
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.png
diff --git a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.txt b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.txt
index d68580e..adee5c2 100644..100755
--- a/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.txt
+++ b/webkit/data/layout_tests/platform/chromium-win/LayoutTests/fast/repaint/box-shadow-v-expected.txt
@@ -1,139 +1,139 @@
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diff --git a/webkit/port/platform/graphics/skia/GraphicsContextSkia.cpp b/webkit/port/platform/graphics/skia/GraphicsContextSkia.cpp
index 6bd586d..fd7968b2 100644
--- a/webkit/port/platform/graphics/skia/GraphicsContextSkia.cpp
+++ b/webkit/port/platform/graphics/skia/GraphicsContextSkia.cpp
@@ -930,21 +930,42 @@ void GraphicsContext::setPlatformFillColor(const Color& color)
 }
 
 void GraphicsContext::setPlatformShadow(const IntSize& size,
-                                        int blur,
+                                        int blur_int,
                                         const Color& color)
 {
     if (paintingDisabled())
         return;
 
+    double width = size.width();
+    double height = size.height();
+    double blur = blur_int;
+
+    if (!m_common->state.shadowsIgnoreTransforms)  {
+        AffineTransform transform = getCTM();
+        transform.map(width, height, &width, &height);
+
+        // Transform for the blur
+        double a = transform.a() * transform.a() + transform.b() * transform.b();
+        double b = transform.a() * transform.c() + transform.b() * transform.d();
+        double c = b;
+        double d = transform.c() * transform.c() + transform.d() * transform.d();
+        double eigenvalue = sqrt(0.5 * ((a + d) - sqrt(4 * b * c + (a - d) * (a - d))));
+        blur *= eigenvalue;
+    } else {
+        // This is weird, but shadows get dropped in the wrong direction for
+        // canvas elements without this.
+        height = -height;
+    }
+
     SkColor c;
     if (color.isValid())
         c = color.rgb();
     else
         c = SkColorSetARGB(0xFF/3, 0, 0, 0);    // "std" apple shadow color.
-    SkDrawLooper* dl = new SkBlurDrawLooper(SkIntToScalar(blur),
-                                            SkIntToScalar(size.width()),
-                                            SkIntToScalar(-size.height()),
-                                            c);
+
+    // TODO(tc): Should we have a max value for the blur?  CG clamps at 1000.0
+    // for perf reasons.
+    SkDrawLooper* dl = new SkBlurDrawLooper(blur, width, height, c);
     platformContext()->setDrawLooper(dl);
     dl->unref();
 }
diff --git a/webkit/tools/layout_tests/test_lists/tests_fixable.txt b/webkit/tools/layout_tests/test_lists/tests_fixable.txt
index 6d631b1..1438ba7 100644
--- a/webkit/tools/layout_tests/test_lists/tests_fixable.txt
+++ b/webkit/tools/layout_tests/test_lists/tests_fixable.txt
@@ -2120,14 +2120,6 @@ WIN : LayoutTests/fast/text/international/002.html = FAIL
 WIN : LayoutTests/fast/text/international/003.html = FAIL
 WIN : LayoutTests/fast/text/international/wrap-CJK-001.html = FAIL
 
-// TODO(tc): Regression due to shadow changes.
-LayoutTests/fast/box-shadow/basic-shadows.html = FAIL
-LayoutTests/fast/box-shadow/border-radius-big.html = FAIL
-LayoutTests/fast/repaint/box-shadow-dynamic.html = FAIL
-LayoutTests/fast/repaint/box-shadow-h.html = FAIL
-LayoutTests/fast/repaint/box-shadow-v.html = FAIL
-
 // 2008/12/13 - Turning off some Friday night test regressions until they can be looked at.
 WIN : LayoutTests/fast/css/beforeSelectorOnCodeElement.html = CRASH
 DEBUG WIN : LayoutTests/svg/dynamic-updates/SVGForeignObjectElement-svgdom-height-prop.html = CRASH
-