external/webkit r30707

1 files changed, 245 insertions, 0 deletions

diff --git a/WebCore/platform/graphics/gtk/FontGtk.cpp b/WebCore/platform/graphics/gtk/FontGtk.cpp
new file mode 100644
index 0000000..387b61c
--- /dev/null
+++ b/WebCore/platform/graphics/gtk/FontGtk.cpp
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2006 Michael Emmel mike.emmel@gmail.com
+ * Copyright (c) 2007 Hiroyuki Ikezoe
+ * Copyright (c) 2007 Kouhei Sutou
+ * Copyright (C) 2007 Alp Toker <alp@atoker.com>
+ * Copyright (C) 2008 Xan Lopez <xan@gnome.org>
+ * All rights reserved.
+ *
+ * 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 "GraphicsContext.h"
+#include "NotImplemented.h"
+#include "SimpleFontData.h"
+
+#include <cairo.h>
+#include <pango/pango.h>
+#include <pango/pangocairo.h>
+
+namespace WebCore {
+
+#define IS_HIGH_SURROGATE(u)  ((UChar)(u) >= (UChar)0xd800 && (UChar)(u) <= (UChar)0xdbff)
+#define IS_LOW_SURROGATE(u)  ((UChar)(u) >= (UChar)0xdc00 && (UChar)(u) <= (UChar)0xdfff)
+
+static void utf16_to_utf8(const UChar* aText, gint aLength, char* &text, gint &length)
+{
+  gboolean need_copy = FALSE;
+  int i;
+
+  for (i = 0; i < aLength; i++) {
+    if (!aText[i] || IS_LOW_SURROGATE(aText[i])) {
+      need_copy = TRUE;
+      break;
+    }
+    else if (IS_HIGH_SURROGATE(aText[i])) {
+      if (i < aLength - 1 && IS_LOW_SURROGATE(aText[i+1]))
+        i++;
+      else {
+        need_copy = TRUE;
+        break;
+      }
+    }
+  }
+
+  if (need_copy) {
+
+    /* Pango doesn't correctly handle nuls.  We convert them to 0xff. */
+    /* Also "validate" UTF-16 text to make sure conversion doesn't fail. */
+
+    UChar* p = (UChar*)g_memdup(aText, aLength * sizeof(aText[0]));
+
+    /* don't need to reset i */
+    for (i = 0; i < aLength; i++) {
+      if (!p[i] || IS_LOW_SURROGATE(p[i]))
+        p[i] = 0xFFFD;
+      else if (IS_HIGH_SURROGATE(p[i])) {
+        if (i < aLength - 1 && IS_LOW_SURROGATE(aText[i+1]))
+          i++;
+        else
+          p[i] = 0xFFFD;
+      }
+    }
+
+    aText = p;
+  }
+
+  glong items_written;
+  text = g_utf16_to_utf8(aText, aLength, NULL, &items_written, NULL);
+  length = items_written;
+
+  if (need_copy)
+    g_free((gpointer)aText);
+
+}
+
+static gchar* convertUniCharToUTF8(const UChar* characters, gint length, int from, int to)
+{
+    gchar* utf8 = 0;
+    gint new_length = 0;
+    utf16_to_utf8(characters, length, utf8, new_length);
+    if (!utf8)
+        return NULL;
+
+    if (from > 0) {
+        // discard the first 'from' characters
+        // FIXME: we should do this before the conversion probably
+        gchar* str_left = g_utf8_offset_to_pointer(utf8, from);
+        gchar* tmp = g_strdup(str_left);
+        g_free(utf8);
+        utf8 = tmp;
+    }
+
+    gchar* pos = utf8;
+    gint len = strlen(pos);
+    GString* ret = g_string_new_len(NULL, len);
+
+    // replace line break by space
+    while (len > 0) {
+        gint index, start;
+        pango_find_paragraph_boundary(pos, len, &index, &start);
+        g_string_append_len(ret, pos, index);
+        if (index == start)
+            break;
+        g_string_append_c(ret, ' ');
+        pos += start;
+        len -= start;
+    }
+    return g_string_free(ret, FALSE);
+}
+
+static void setPangoAttributes(const Font* font, const TextRun& run, PangoLayout* layout)
+{
+    PangoAttrList* list = pango_attr_list_new();
+    PangoAttribute* attr;
+
+    attr = pango_attr_size_new_absolute((int)(font->size() * PANGO_SCALE));
+    attr->end_index = G_MAXUINT;
+    pango_attr_list_insert_before(list, attr);
+
+    if (!run.spacingDisabled()) {
+        attr = pango_attr_letter_spacing_new(font->letterSpacing() * PANGO_SCALE);
+        attr->end_index = G_MAXUINT;
+        pango_attr_list_insert_before(list, attr);
+    }
+
+    // Pango does not yet support synthesising small caps
+    // See http://bugs.webkit.org/show_bug.cgi?id=15610
+
+    pango_layout_set_attributes(layout, list);
+    pango_attr_list_unref(list);
+
+    pango_layout_set_auto_dir(layout, FALSE);
+
+    PangoContext* pangoContext = pango_layout_get_context(layout);
+    PangoDirection direction = run.rtl() ? PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR;
+    pango_context_set_base_dir(pangoContext, direction);
+}
+
+void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
+{
+    cairo_t* cr = context->platformContext();
+    cairo_save(cr);
+
+    PangoLayout* layout = pango_cairo_create_layout(cr);
+
+    gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), from, to);
+    pango_layout_set_text(layout, utf8, -1);
+    g_free(utf8);
+
+    setPangoAttributes(this, run, layout);
+
+    // Set the text color to use for drawing.
+    float red, green, blue, alpha;
+    Color penColor = context->fillColor();
+    penColor.getRGBA(red, green, blue, alpha);
+    cairo_set_source_rgba(cr, red, green, blue, alpha);
+
+    // Our layouts are single line
+    cairo_move_to(cr, point.x(), point.y());
+    PangoLayoutLine* layoutLine = pango_layout_get_line_readonly(layout, 0);
+    pango_cairo_show_layout_line(cr, layoutLine);
+
+    g_object_unref(layout);
+    cairo_restore(cr);
+}
+
+// FIXME: we should create the layout with our actual context, but it seems
+// we can't access it from here
+static PangoLayout* getDefaultPangoLayout(const TextRun& run)
+{
+    PangoFontMap* map = pango_cairo_font_map_get_default();
+    PangoContext* pangoContext = pango_cairo_font_map_create_context(PANGO_CAIRO_FONT_MAP(map));
+    PangoLayout* layout = pango_layout_new(pangoContext);
+    g_object_unref(pangoContext);
+
+    return layout;
+}
+
+float Font::floatWidthForComplexText(const TextRun& run) const
+{
+    if (run.length() == 0)
+        return 0.0f;
+
+    PangoLayout* layout = getDefaultPangoLayout(run);
+    setPangoAttributes(this, run, layout);
+
+    gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
+    pango_layout_set_text(layout, utf8, -1);
+    g_free(utf8);
+
+    int layoutWidth;
+    pango_layout_get_size(layout, &layoutWidth, 0);
+    float width = (float)layoutWidth / (double)PANGO_SCALE;
+    g_object_unref(layout);
+
+    return width;
+}
+
+int Font::offsetForPositionForComplexText(const TextRun& run, int x, bool includePartialGlyphs) const
+{
+    PangoLayout* layout = getDefaultPangoLayout(run);
+    setPangoAttributes(this, run, layout);
+
+    gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
+    pango_layout_set_text(layout, utf8, -1);
+
+    int index, trailing;
+    pango_layout_xy_to_index(layout, x * PANGO_SCALE, 1, &index, &trailing);
+    glong offset = g_utf8_pointer_to_offset(utf8, utf8 + index);
+    g_free(utf8);
+    g_object_unref(layout);
+
+    return offset;
+}
+
+FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& point, int h, int from, int to) const
+{
+    notImplemented();
+    return FloatRect();
+}
+
+}