/*
* 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
#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::drawGlyphs(GraphicsContext* graphicsContext, const SimpleFontData* font, const GlyphBuffer& glyphBuffer,
int from, int numGlyphs, const FloatPoint& point) const
{
- cairo_t* context = graphicsContext->platformContext();
+ cairo_t* cr = graphicsContext->platformContext();
+ cairo_save(cr);
// Set the text color to use for drawing.
float red, green, blue, alpha;
Color penColor = graphicsContext->fillColor();
penColor.getRGBA(red, green, blue, alpha);
- cairo_set_source_rgba(context, red, green, blue, alpha);
+ cairo_set_source_rgba(cr, red, green, blue, alpha);
- // This was commented out as it made "some text invisible" but seems to work now.
- font->setFont(context);
+ font->setFont(cr);
- GlyphBufferGlyph* glyphs = (GlyphBufferGlyph*) glyphBuffer.glyphs(from);
+ GlyphBufferGlyph* glyphs = (GlyphBufferGlyph*)glyphBuffer.glyphs(from);
float offset = point.x();
glyphs[i].y = point.y();
offset += glyphBuffer.advanceAt(from + i);
}
- cairo_show_glyphs(context, glyphs, numGlyphs);
+ cairo_show_glyphs(cr, glyphs, numGlyphs);
+
+ cairo_restore(cr);
}
-void Font::drawComplexText(GraphicsContext*, const TextRun&, const FloatPoint&, int from, int to) const
+void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
- notImplemented();
+ 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);
}
-float Font::floatWidthForComplexText(const TextRun&) const
+// 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)
{
- notImplemented();
- return 0.0f;
+ 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;
}
-int Font::offsetForPositionForComplexText(const TextRun&, int, bool) const
+float Font::floatWidthForComplexText(const TextRun& run) const
{
- notImplemented();
- return 0;
+ 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&, const IntPoint&, int, int, int) const
+FloatRect Font::selectionRectForComplexText(const TextRun& run, const IntPoint& point, int h, int from, int to) const
{
notImplemented();
return FloatRect();
git://git.webkit.org / WebKit-https.git / commitdiff