Canvas refactoring part 2....

gfx/canvas_linux.cc

Index: gfx/canvas_linux.cc
===================================================================
--- gfx/canvas_linux.cc	(revision 50557)
+++ gfx/canvas_linux.cc	(working copy)
@@ -1,269 +0,0 @@
-// Copyright (c) 2009 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 "gfx/canvas.h"
-
-#include <cairo/cairo.h>
-#include <gtk/gtk.h>
-#include <pango/pango.h>
-#include <pango/pangocairo.h>
-
-#include "base/logging.h"
-#include "base/utf_string_conversions.h"
-#include "gfx/font.h"
-#include "gfx/gtk_util.h"
-#include "gfx/rect.h"
-
-namespace {
-
-const gunichar kAcceleratorChar = '&';
-
-// Font settings that we initialize once and then use when drawing text in
-// DrawStringInt().
-static cairo_font_options_t* cairo_font_options = NULL;
-
-// Update |cairo_font_options| based on GtkSettings, allocating it if needed.
-static void UpdateCairoFontOptions() {
-  if (!cairo_font_options)
-    cairo_font_options = cairo_font_options_create();
-
-  GtkSettings* gtk_settings = gtk_settings_get_default();
-  gint antialias = 0;
-  gint hinting = 0;
-  gchar* hint_style = NULL;
-  gchar* rgba_style = NULL;
-  g_object_get(gtk_settings,
-               "gtk-xft-antialias", &antialias,
-               "gtk-xft-hinting", &hinting,
-               "gtk-xft-hintstyle", &hint_style,
-               "gtk-xft-rgba", &rgba_style,
-               NULL);
-
-  // g_object_get() doesn't tell us whether the properties were present or not,
-  // but if they aren't (because gnome-settings-daemon isn't running), we'll get
-  // NULL values for the strings.
-  if (hint_style && rgba_style) {
-    if (!antialias) {
-      cairo_font_options_set_antialias(cairo_font_options,
-                                       CAIRO_ANTIALIAS_NONE);
-    } else if (strcmp(rgba_style, "none") == 0) {
-      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 (strcmp(rgba_style, "rgb") == 0) {
-        cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB;
-      } else if (strcmp(rgba_style, "bgr") == 0) {
-        cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR;
-      } else if (strcmp(rgba_style, "vrgb") == 0) {
-        cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB;
-      } else if (strcmp(rgba_style, "vbgr") == 0) {
-        cairo_subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR;
-      }
-      cairo_font_options_set_subpixel_order(cairo_font_options,
-                                            cairo_subpixel_order);
-    }
-
-    cairo_hint_style_t cairo_hint_style = CAIRO_HINT_STYLE_DEFAULT;
-    if (hinting == 0 || strcmp(hint_style, "hintnone") == 0) {
-      cairo_hint_style = CAIRO_HINT_STYLE_NONE;
-    } else if (strcmp(hint_style, "hintslight") == 0) {
-      cairo_hint_style = CAIRO_HINT_STYLE_SLIGHT;
-    } else if (strcmp(hint_style, "hintmedium") == 0) {
-      cairo_hint_style = CAIRO_HINT_STYLE_MEDIUM;
-    } else if (strcmp(hint_style, "hintfull") == 0) {
-      cairo_hint_style = CAIRO_HINT_STYLE_FULL;
-    }
-    cairo_font_options_set_hint_style(cairo_font_options, cairo_hint_style);
-  }
-
-  if (hint_style)
-    g_free(hint_style);
-  if (rgba_style)
-    g_free(rgba_style);
-}
-
-}  // namespace
-
-namespace gfx {
-
-Canvas::Canvas(int width, int height, bool is_opaque)
-    : skia::PlatformCanvas(width, height, is_opaque) {
-}
-
-Canvas::Canvas() : skia::PlatformCanvas() {
-}
-
-Canvas::~Canvas() {
-}
-
-// Pass a width > 0 to force wrapping and elliding.
-static void SetupPangoLayout(PangoLayout* layout,
-                             const std::wstring& text,
-                             const gfx::Font& font,
-                             int width,
-                             int flags) {
-  if (!cairo_font_options)
-    UpdateCairoFontOptions();
-  // 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);
-
-  // Callers of DrawStringInt handle RTL layout themselves, so tell pango to not
-  // scope out RTL characters.
-  pango_layout_set_auto_dir(layout, FALSE);
-
-  if (width > 0)
-    pango_layout_set_width(layout, width * PANGO_SCALE);
-
-  if (flags & Canvas::NO_ELLIPSIS) {
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
-  } else {
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
-  }
-
-  if (flags & Canvas::TEXT_ALIGN_CENTER) {
-    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::MULTI_LINE) {
-    pango_layout_set_wrap(layout,
-        (flags & Canvas::CHARACTER_BREAK) ?
-            PANGO_WRAP_WORD_CHAR : PANGO_WRAP_WORD);
-  }
-
-  // Set the resolution to match that used by Gtk. If we don't set the
-  // resolution and the resolution differs from the default, Gtk and Chrome end
-  // up drawing at different sizes.
-  double resolution = gfx::GetPangoResolution();
-  if (resolution > 0) {
-    pango_cairo_context_set_resolution(pango_layout_get_context(layout),
-                                       resolution);
-  }
-
-  PangoFontDescription* desc = gfx::Font::PangoFontFromGfxFont(font);
-  pango_layout_set_font_description(layout, desc);
-  pango_font_description_free(desc);
-
-  // Set text and accelerator character if needed.
-  std::string utf8 = WideToUTF8(text);
-  if (flags & gfx::Canvas::HIDE_PREFIX) {
-    // Escape the text string to be used as markup.
-    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 {
-    pango_layout_set_text(layout, utf8.data(), utf8.size());
-  }
-}
-
-// static
-void Canvas::SizeStringInt(const std::wstring& text,
-                           const gfx::Font& font,
-                           int* width, int* height, int flags) {
-  int org_width = *width;
-  cairo_surface_t* surface =
-      cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 0, 0);
-  cairo_t* cr = cairo_create(surface);
-  PangoLayout* layout = pango_cairo_create_layout(cr);
-
-  SetupPangoLayout(layout, text, font, *width, flags);
-
-  pango_layout_get_pixel_size(layout, width, height);
-
-  if (org_width > 0 && flags & Canvas::MULTI_LINE &&
-      pango_layout_is_wrapped(layout)) {
-    // The text wrapped. There seems to be a bug in Pango when this happens
-    // such that the width returned from pango_layout_get_pixel_size is too
-    // small. Using the width from pango_layout_get_pixel_size in this case
-    // results in wrapping across more lines, which requires a bigger height.
-    // As a workaround we use the original width, which is not necessarily
-    // exactly correct, but isn't wrong by much.
-    //
-    // It looks like Pango uses the size of whitespace in calculating wrapping
-    // but doesn't include the size of the whitespace when the extents are
-    // asked for. See the loop in pango-layout.c process_item that determines
-    // where to wrap.
-    *width = org_width;
-  }
-
-  g_object_unref(layout);
-  cairo_destroy(cr);
-  cairo_surface_destroy(surface);
-}
-
-void Canvas::DrawStringInt(const std::wstring& text,
-                           const gfx::Font& font,
-                           const SkColor& color,
-                           int x, int y, int w, int h,
-                           int flags) {
-  if (w <= 0 || h <= 0)
-    return;
-
-  cairo_t* cr = beginPlatformPaint();
-  PangoLayout* layout = pango_cairo_create_layout(cr);
-
-  SetupPangoLayout(layout, text, font, w, flags);
-
-  pango_layout_set_height(layout, h * PANGO_SCALE);
-
-  cairo_save(cr);
-  cairo_set_source_rgba(cr,
-                        SkColorGetR(color) / 255.0,
-                        SkColorGetG(color) / 255.0,
-                        SkColorGetB(color) / 255.0,
-                        SkColorGetA(color) / 255.0);
-
-  int width, height;
-  pango_layout_get_pixel_size(layout, &width, &height);
-
-  cairo_rectangle(cr, x, y, w, h);
-  cairo_clip(cr);
-
-  if (flags & Canvas::TEXT_VALIGN_TOP) {
-    // Cairo should draw from the top left corner already.
-  } else if (flags & Canvas::TEXT_VALIGN_BOTTOM) {
-    y += (h - height);
-  } else {
-    // Vertically centered.
-    y += ((h - height) / 2);
-  }
-
-  cairo_move_to(cr, x, y);
-  pango_cairo_show_layout(cr, layout);
-  if (font.style() & gfx::Font::UNDERLINED) {
-    double underline_y =
-        static_cast<double>(y) + height + font.underline_position();
-    cairo_set_line_width(cr, font.underline_thickness());
-    cairo_move_to(cr, x, underline_y);
-    cairo_line_to(cr, x + width, underline_y);
-    cairo_stroke(cr);
-  }
-  cairo_restore(cr);
-
-  g_object_unref(layout);
-  // NOTE: beginPlatformPaint returned its surface, we shouldn't destroy it.
-}
-
-void Canvas::DrawGdkPixbuf(GdkPixbuf* pixbuf, int x, int y) {
-  if (!pixbuf) {
-    NOTREACHED();
-    return;
-  }
-
-  cairo_t* cr = beginPlatformPaint();
-  gdk_cairo_set_source_pixbuf(cr, pixbuf, x, y);
-  cairo_paint(cr);
-}
-
-}  // namespace gfx