Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 175 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/cairo/FontCairo.cpp b/Source/WebCore/platform/graphics/cairo/FontCairo.cpp
new file mode 100644
index 0000000..2d79499
--- /dev/null
+++ b/Source/WebCore/platform/graphics/cairo/FontCairo.cpp
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
+ * Copyright (C) 2007, 2008 Alp Toker <alp@atoker.com>
+ * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
+ * Copyright (C) 2010 Holger Hans Peter Freyther
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "Font.h"
+
+#include "AffineTransform.h"
+#include "CairoUtilities.h"
+#include "ContextShadow.h"
+#include "GlyphBuffer.h"
+#include "Gradient.h"
+#include "GraphicsContext.h"
+#include "ImageBuffer.h"
+#include "Pattern.h"
+#include "SimpleFontData.h"
+
+namespace WebCore {
+
+static void prepareContextForGlyphDrawing(cairo_t* context, const SimpleFontData* font, const FloatPoint& point)
+{
+    static const float syntheticObliqueSkew = -tanf(14 * acosf(0) / 90);
+    cairo_set_scaled_font(context, font->platformData().scaledFont());
+    if (font->platformData().syntheticOblique()) {
+        cairo_matrix_t mat = {1, 0, syntheticObliqueSkew, 1, point.x(), point.y()};
+        cairo_transform(context, &mat);
+    } else
+        cairo_translate(context, point.x(), point.y());
+}
+
+static void drawGlyphsToContext(cairo_t* context, const SimpleFontData* font, GlyphBufferGlyph* glyphs, int numGlyphs)
+{
+    cairo_show_glyphs(context, glyphs, numGlyphs);
+    if (font->syntheticBoldOffset()) {
+        // We could use cairo_save/cairo_restore here, but two translations are likely faster.
+        cairo_translate(context, font->syntheticBoldOffset(), 0);
+        cairo_show_glyphs(context, glyphs, numGlyphs);
+        cairo_translate(context, -font->syntheticBoldOffset(), 0);
+    }
+}
+
+static void drawGlyphsShadow(GraphicsContext* graphicsContext, cairo_t* context, const FloatPoint& point, const SimpleFontData* font, GlyphBufferGlyph* glyphs, int numGlyphs)
+{
+    ContextShadow* shadow = graphicsContext->contextShadow();
+    ASSERT(shadow);
+
+    if (!(graphicsContext->textDrawingMode() & TextModeFill) || shadow->m_type == ContextShadow::NoShadow)
+        return;
+
+    if (!shadow->mustUseContextShadow(graphicsContext)) {
+        // Optimize non-blurry shadows, by just drawing text without the ContextShadow.
+        cairo_save(context);
+        cairo_translate(context, shadow->m_offset.width(), shadow->m_offset.height());
+        setSourceRGBAFromColor(context, shadow->m_color);
+        prepareContextForGlyphDrawing(context, font, point);
+        cairo_show_glyphs(context, glyphs, numGlyphs);
+        cairo_restore(context);
+        return;
+    }
+
+    cairo_text_extents_t extents;
+    cairo_scaled_font_glyph_extents(font->platformData().scaledFont(), glyphs, numGlyphs, &extents);
+    FloatRect fontExtentsRect(point.x(), point.y() - extents.height, extents.width, extents.height);
+    cairo_t* shadowContext = shadow->beginShadowLayer(graphicsContext, fontExtentsRect);
+    if (shadowContext) {
+        prepareContextForGlyphDrawing(shadowContext, font, point);
+        drawGlyphsToContext(shadowContext, font, glyphs, numGlyphs);
+        shadow->endShadowLayer(graphicsContext);
+    }
+}
+
+void Font::drawGlyphs(GraphicsContext* context, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
+                      int from, int numGlyphs, const FloatPoint& point) const
+{
+    GlyphBufferGlyph* glyphs = (GlyphBufferGlyph*)glyphBuffer.glyphs(from);
+
+    float offset = 0.0f;
+    for (int i = 0; i < numGlyphs; i++) {
+        glyphs[i].x = offset;
+        glyphs[i].y = 0.0f;
+        offset += glyphBuffer.advanceAt(from + i);
+    }
+
+    cairo_t* cr = context->platformContext();
+    drawGlyphsShadow(context, cr, point, font, glyphs, numGlyphs);
+
+    cairo_save(cr);
+    prepareContextForGlyphDrawing(cr, font, point);
+    if (context->textDrawingMode() & TextModeFill) {
+        if (context->fillGradient()) {
+            cairo_set_source(cr, context->fillGradient()->platformGradient());
+            if (context->getAlpha() < 1.0f) {
+                cairo_push_group(cr);
+                cairo_paint_with_alpha(cr, context->getAlpha());
+                cairo_pop_group_to_source(cr);
+            }
+        } else if (context->fillPattern()) {
+            AffineTransform affine;
+            cairo_pattern_t* pattern = context->fillPattern()->createPlatformPattern(affine);
+            cairo_set_source(cr, pattern);
+            if (context->getAlpha() < 1.0f) {
+                cairo_push_group(cr);
+                cairo_paint_with_alpha(cr, context->getAlpha());
+                cairo_pop_group_to_source(cr);
+            }
+            cairo_pattern_destroy(pattern);
+        } else {
+            float red, green, blue, alpha;
+            context->fillColor().getRGBA(red, green, blue, alpha);
+            cairo_set_source_rgba(cr, red, green, blue, alpha * context->getAlpha());
+        }
+        drawGlyphsToContext(cr, font, glyphs, numGlyphs);
+    }
+
+    // Prevent running into a long computation within cairo. If the stroke width is
+    // twice the size of the width of the text we will not ask cairo to stroke
+    // the text as even one single stroke would cover the full wdth of the text.
+    //  See https://bugs.webkit.org/show_bug.cgi?id=33759.
+    if (context->textDrawingMode() & TextModeStroke && context->strokeThickness() < 2 * offset) {
+        if (context->strokeGradient()) {
+            cairo_set_source(cr, context->strokeGradient()->platformGradient());
+            if (context->getAlpha() < 1.0f) {
+                cairo_push_group(cr);
+                cairo_paint_with_alpha(cr, context->getAlpha());
+                cairo_pop_group_to_source(cr);
+            }
+        } else if (context->strokePattern()) {
+            AffineTransform affine;
+            cairo_pattern_t* pattern = context->strokePattern()->createPlatformPattern(affine);
+            cairo_set_source(cr, pattern);
+            if (context->getAlpha() < 1.0f) {
+                cairo_push_group(cr);
+                cairo_paint_with_alpha(cr, context->getAlpha());
+                cairo_pop_group_to_source(cr);
+            }
+            cairo_pattern_destroy(pattern);
+        } else {
+            float red, green, blue, alpha;
+            context->strokeColor().getRGBA(red, green, blue, alpha);
+            cairo_set_source_rgba(cr, red, green, blue, alpha * context->getAlpha());
+        }
+        cairo_glyph_path(cr, glyphs, numGlyphs);
+        cairo_set_line_width(cr, context->strokeThickness());
+        cairo_stroke(cr);
+    }
+
+    cairo_restore(cr);
+}
+
+}