auto import from //depot/cupcake/@136594

1 files changed, 218 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/skia/SkiaFontWin.cpp b/WebCore/platform/graphics/skia/SkiaFontWin.cpp
new file mode 100644
index 0000000..6e79a7e
--- /dev/null
+++ b/WebCore/platform/graphics/skia/SkiaFontWin.cpp
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2008, Google Inc. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "SkiaFontWin.h"
+
+#include "SkCanvas.h"
+#include "SkPaint.h"
+
+#include <wtf/ListHashSet.h>
+#include <wtf/Vector.h>
+
+namespace WebCore {
+
+struct CachedOutlineKey {
+    CachedOutlineKey() : font(0), glyph(0), path(0) {}
+    CachedOutlineKey(HFONT f, WORD g) : font(f), glyph(g), path(0) {}
+
+    HFONT font;
+    WORD glyph;
+
+    // The lifetime of this pointer is managed externally to this class. Be sure
+    // to call DeleteOutline to remove items.
+    SkPath* path;
+};
+
+const bool operator==(const CachedOutlineKey& a, const CachedOutlineKey& b)
+{
+    return a.font == b.font && a.glyph == b.glyph;
+}
+
+struct CachedOutlineKeyHash {
+    static unsigned hash(const CachedOutlineKey& key)
+    {
+        unsigned keyBytes;
+        memcpy(&keyBytes, &key.font, sizeof(unsigned));
+        return keyBytes + key.glyph;
+    }
+
+    static unsigned equal(const CachedOutlineKey& a, const CachedOutlineKey& b)
+    {
+        return a.font == b.font && a.glyph == b.glyph;
+    }
+
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+
+typedef ListHashSet<CachedOutlineKey, CachedOutlineKeyHash> OutlineCache;
+
+// FIXME: Convert from static constructor to accessor function. WebCore tries to
+// avoid global constructors to save on start-up time.
+static OutlineCache outlineCache;
+
+// The global number of glyph outlines we'll cache.
+static const int outlineCacheSize = 256;
+
+static SkScalar FIXEDToSkScalar(FIXED fixed)
+{
+    SkFixed skFixed;
+    memcpy(&skFixed, &fixed, sizeof(SkFixed));
+    return SkFixedToScalar(skFixed);
+}
+
+// Removes the given key from the cached outlines, also deleting the path.
+static void deleteOutline(OutlineCache::iterator deleteMe)
+{
+    delete deleteMe->path;
+    outlineCache.remove(deleteMe);
+}
+
+static void addPolyCurveToPath(const TTPOLYCURVE* polyCurve, SkPath* path)
+{
+    switch (polyCurve->wType) {
+    case TT_PRIM_LINE:
+        for (WORD i = 0; i < polyCurve->cpfx; i++) {
+          path->lineTo(FIXEDToSkScalar(polyCurve->apfx[i].x), -FIXEDToSkScalar(polyCurve->apfx[i].y));
+        }
+        break;
+
+    case TT_PRIM_QSPLINE:
+        // FIXME: doesn't this duplicate points if we do the loop > once?
+        for (WORD i = 0; i < polyCurve->cpfx - 1; i++) {
+            SkScalar bx = FIXEDToSkScalar(polyCurve->apfx[i].x);
+            SkScalar by = FIXEDToSkScalar(polyCurve->apfx[i].y);
+
+            SkScalar cx = FIXEDToSkScalar(polyCurve->apfx[i + 1].x);
+            SkScalar cy = FIXEDToSkScalar(polyCurve->apfx[i + 1].y);
+            if (i < polyCurve->cpfx - 2) {
+                // We're not the last point, compute C.
+                cx = SkScalarAve(bx, cx);
+                cy = SkScalarAve(by, cy);
+            }
+
+            // Need to flip the y coordinates since the font's coordinate system is
+            // flipped from ours vertically.
+            path->quadTo(bx, -by, cx, -cy);
+        }
+        break;
+
+    case TT_PRIM_CSPLINE:
+        // FIXME
+        break;
+    }
+}
+
+// The size of the glyph path buffer.
+static const int glyphPathBufferSize = 4096;
+
+// Fills the given SkPath with the outline for the given glyph index. The font
+// currently selected into the given DC is used. Returns true on success.
+static bool getPathForGlyph(HDC dc, WORD glyph, SkPath* path)
+{
+    char buffer[glyphPathBufferSize];
+    GLYPHMETRICS gm;
+    MAT2 mat = {{0, 1}, {0, 0}, {0, 0}, {0, 1}};  // Each one is (fract,value).
+
+    DWORD totalSize = GetGlyphOutlineW(dc, glyph, GGO_GLYPH_INDEX | GGO_NATIVE,
+                                       &gm, glyphPathBufferSize, buffer, &mat);
+    if (totalSize == GDI_ERROR)
+        return false;
+
+    const char* curGlyph = buffer;
+    const char* endGlyph = &buffer[totalSize];
+    while (curGlyph < endGlyph) {
+        const TTPOLYGONHEADER* polyHeader =
+            reinterpret_cast<const TTPOLYGONHEADER*>(curGlyph);
+        path->moveTo(FIXEDToSkScalar(polyHeader->pfxStart.x),
+                     -FIXEDToSkScalar(polyHeader->pfxStart.y));
+
+        const char* curPoly = curGlyph + sizeof(TTPOLYGONHEADER);
+        const char* endPoly = curGlyph + polyHeader->cb;
+        while (curPoly < endPoly) {
+            const TTPOLYCURVE* polyCurve =
+                reinterpret_cast<const TTPOLYCURVE*>(curPoly);
+            addPolyCurveToPath(polyCurve, path);
+            curPoly += sizeof(WORD) * 2 + sizeof(POINTFX) * polyCurve->cpfx;
+        }
+        curGlyph += polyHeader->cb;
+    }
+
+    path->close();
+    return true;
+}
+
+// Returns a SkPath corresponding to the give glyph in the given font. The font
+// should be selected into the given DC. The returned path is owned by the
+// hashtable. Returns 0 on error.
+const SkPath* SkiaWinOutlineCache::lookupOrCreatePathForGlyph(HDC hdc, HFONT font, WORD glyph)
+{
+    CachedOutlineKey key(font, glyph);
+    OutlineCache::iterator found = outlineCache.find(key);
+    if (found != outlineCache.end()) {
+        // Keep in MRU order by removing & reinserting the value.
+        key = *found;
+        outlineCache.remove(found);
+        outlineCache.add(key);
+        return key.path;
+    }
+
+    key.path = new SkPath;
+    if (!getPathForGlyph(hdc, glyph, key.path))
+      return 0;
+
+    if (outlineCache.size() > outlineCacheSize)
+        // The cache is too big, find the oldest value (first in the list).
+        deleteOutline(outlineCache.begin());
+
+    outlineCache.add(key);
+    return key.path;
+}
+
+
+void SkiaWinOutlineCache::removePathsForFont(HFONT hfont)
+{
+    // ListHashSet isn't the greatest structure for deleting stuff out of, but
+    // removing entries will be relatively rare (we don't remove fonts much, nor
+    // do we draw out own glyphs using these routines much either).
+    //
+    // We keep a list of all glyphs we're removing which we do in a separate
+    // pass.
+    Vector<CachedOutlineKey> outlinesToDelete;
+    for (OutlineCache::iterator i = outlineCache.begin();
+         i != outlineCache.end(); ++i)
+        outlinesToDelete.append(*i);
+
+    for (Vector<CachedOutlineKey>::iterator i = outlinesToDelete.begin();
+         i != outlinesToDelete.end(); ++i)
+        deleteOutline(outlineCache.find(*i));
+}
+
+}  // namespace WebCore