Make FontList description-parsing public.

ui/gfx/pango_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/pango_util.h"
 
 #include <cairo/cairo.h>
 #include <pango/pango.h>
 #include <pango/pangocairo.h>
 #include <string>
 
 #include <algorithm>
 #include <map>
 
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/font_list.h"
 #include "ui/gfx/font_render_params.h"
 #include "ui/gfx/linux_font_delegate.h"
 #include "ui/gfx/platform_font_pango.h"
 #include "ui/gfx/text_utils.h"
 
 namespace gfx {
 
 namespace {
 
-// Marker for accelerators in the text.
-const gunichar kAcceleratorChar = '&';
-
 // Creates and returns a PangoContext. The caller owns the context.
 PangoContext* GetPangoContext() {
   PangoFontMap* font_map = pango_cairo_font_map_get_default();
   return pango_font_map_create_context(font_map);
 }
 
-// Creates a new cairo_font_options_t based on |params|.
-cairo_font_options_t* CreateCairoFontOptions(const FontRenderParams& params) {
-  cairo_font_options_t* cairo_font_options = cairo_font_options_create();
-
-  FontRenderParams::SubpixelRendering subpixel = params.subpixel_rendering;
-  if (!params.antialiasing) {
-    cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_NONE);
-  } else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_NONE) {
-    cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_GRAY);
-  } else {
-    cairo_font_options_set_antialias(cairo_font_options,
-                                     CAIRO_ANTIALIAS_SUBPIXEL);
-    cairo_subpixel_order_t cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT;
-    if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_RGB)
-      cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB;
-    else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_BGR)
-      cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR;
-    else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_VRGB)
-      cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB;
-    else if (subpixel == FontRenderParams::SUBPIXEL_RENDERING_VBGR)
-      cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR;
-    else
-      NOTREACHED() << "Unhandled subpixel rendering type " << subpixel;
-    cairo_font_options_set_subpixel_order(cairo_font_options,
-                                          cairo_subpixel_order);
-  }
-
-  if (params.hinting == FontRenderParams::HINTING_NONE ||
-      params.subpixel_positioning) {
-    cairo_font_options_set_hint_style(cairo_font_options,
-                                      CAIRO_HINT_STYLE_NONE);
-    cairo_font_options_set_hint_metrics(cairo_font_options,
-                                        CAIRO_HINT_METRICS_OFF);
-  } else {
-    cairo_hint_style_t cairo_hint_style = CAIRO_HINT_STYLE_DEFAULT;
-    if (params.hinting == FontRenderParams::HINTING_SLIGHT)
-      cairo_hint_style = CAIRO_HINT_STYLE_SLIGHT;
-    else if (params.hinting == FontRenderParams::HINTING_MEDIUM)
-      cairo_hint_style = CAIRO_HINT_STYLE_MEDIUM;
-    else if (params.hinting == FontRenderParams::HINTING_FULL)
-      cairo_hint_style = CAIRO_HINT_STYLE_FULL;
-    else
-      NOTREACHED() << "Unhandled hinting style " << params.hinting;
-    cairo_font_options_set_hint_style(cairo_font_options, cairo_hint_style);
-    cairo_font_options_set_hint_metrics(cairo_font_options,
-                                        CAIRO_HINT_METRICS_ON);
-  }
-
-  return cairo_font_options;
-}
-
 // Returns the DPI that should be used by Pango.
 double GetPangoDPI() {
   static double dpi = -1.0;
   if (dpi < 0.0) {
     const gfx::LinuxFontDelegate* delegate = gfx::LinuxFontDelegate::instance();
     if (delegate)
       dpi = delegate->GetFontDPI();
     if (dpi <= 0.0)
       dpi = 96.0;
   }
   return dpi;
 }
 
 // Returns the number of pixels in a point.
 // - multiply a point size by this to get pixels ("device units")
 // - divide a pixel size by this to get points
 double GetPixelsInPoint() {
   static double pixels_in_point = GetPangoDPI() / 72.0;  // 72 points in an inch
   return pixels_in_point;
 }
 
 }  // namespace
 
-void SetUpPangoLayout(
-    PangoLayout* layout,
-    const base::string16& text,
-    const FontList& font_list,
-    base::i18n::TextDirection text_direction,
-    int flags) {
-  cairo_font_options_t* cairo_font_options = CreateCairoFontOptions(
-      font_list.GetPrimaryFont().GetFontRenderParams());
-
-  // If we got an explicit request to turn off subpixel rendering, disable it.
-  if ((flags & Canvas::NO_SUBPIXEL_RENDERING) &&
-      (cairo_font_options_get_antialias(cairo_font_options) ==
-       CAIRO_ANTIALIAS_SUBPIXEL))
-    cairo_font_options_set_antialias(cairo_font_options, CAIRO_ANTIALIAS_GRAY);
-
-  // This needs to be done early on; it has no effect when called just before
-  // pango_cairo_show_layout().
-  pango_cairo_context_set_font_options(
-      pango_layout_get_context(layout), cairo_font_options);
-  cairo_font_options_destroy(cairo_font_options);
-  cairo_font_options = NULL;
-
-  // Set Pango's base text direction explicitly from |text_direction|.
-  pango_layout_set_auto_dir(layout, FALSE);
-  pango_context_set_base_dir(pango_layout_get_context(layout),
-      (text_direction == base::i18n::RIGHT_TO_LEFT ?
-       PANGO_DIRECTION_RTL : PANGO_DIRECTION_LTR));
-
-  if (flags & Canvas::TEXT_ALIGN_CENTER) {
-    // We don't support center aligned w/ eliding.
-    DCHECK(gfx::Canvas::NO_ELLIPSIS);
-    pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
-  } else if (flags & Canvas::TEXT_ALIGN_RIGHT) {
-    pango_layout_set_alignment(layout, PANGO_ALIGN_RIGHT);
-  }
-
-  if (flags & Canvas::NO_ELLIPSIS) {
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
-    if (flags & Canvas::MULTI_LINE) {
-      pango_layout_set_wrap(layout,
-          (flags & Canvas::CHARACTER_BREAK) ?
-              PANGO_WRAP_WORD_CHAR : PANGO_WRAP_WORD);
-    }
-  } else if (text_direction == base::i18n::RIGHT_TO_LEFT) {
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
-  } else {
-    // Fading the text will be handled in the draw operation.
-    // Ensure that the text is only on one line.
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
-    pango_layout_set_width(layout, -1);
-  }
-
-  // Set the layout's resolution to match the resolution used to convert from
-  // points to pixels.
-  pango_cairo_context_set_resolution(pango_layout_get_context(layout),
-                                     GetPangoDPI());
-
-  // Set text and accelerator character if needed.
-  if (flags & Canvas::SHOW_PREFIX) {
-    // Escape the text string to be used as markup.
-    std::string utf8 = base::UTF16ToUTF8(text);
-    gchar* escaped_text = g_markup_escape_text(utf8.c_str(), utf8.size());
-    pango_layout_set_markup_with_accel(layout,
-                                       escaped_text,
-                                       strlen(escaped_text),
-                                       kAcceleratorChar, NULL);
-    g_free(escaped_text);
-  } else {
-    std::string utf8;
-
-    // Remove the ampersand character.  A double ampersand is output as
-    // a single ampersand.
-    if (flags & Canvas::HIDE_PREFIX) {
-      DCHECK_EQ(1, g_unichar_to_utf8(kAcceleratorChar, NULL));
-      base::string16 accelerator_removed =
-          RemoveAcceleratorChar(text,
-                                static_cast<base::char16>(kAcceleratorChar),
-                                NULL, NULL);
-      utf8 = base::UTF16ToUTF8(accelerator_removed);
-    } else {
-      utf8 = base::UTF16ToUTF8(text);
-    }
-
-    pango_layout_set_text(layout, utf8.data(), utf8.size());
-  }
-
-  ScopedPangoFontDescription desc(pango_font_description_from_string(
-      font_list.GetFontDescriptionString().c_str()));
-  pango_layout_set_font_description(layout, desc.get());
-}
-
 int GetPangoFontSizeInPixels(PangoFontDescription* pango_font) {
   // If the size is absolute, then it's in Pango units rather than points. There
   // are PANGO_SCALE Pango units in a device unit (pixel).
   if (pango_font_description_get_size_is_absolute(pango_font))
     return pango_font_description_get_size(pango_font) / PANGO_SCALE;
 
   // Otherwise, we need to convert from points.
   return static_cast<int>(GetPixelsInPoint() *
       pango_font_description_get_size(pango_font) / PANGO_SCALE + 0.5);
 }
@@ skipping 16 matching lines @@
 
   if (i == desc_to_metrics->end()) {
     PangoFontMetrics* metrics = pango_context_get_metrics(context, desc, NULL);
     desc_to_metrics->insert(std::make_pair(desc_hash, metrics));
     return metrics;
   }
   return i->second;
 }
 
 }  // namespace gfx