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| author | ben@chromium.org <ben@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2010-03-23 04:05:01 +0000 |
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| committer | ben@chromium.org <ben@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> | 2010-03-23 04:05:01 +0000 |
| commit | d07b6b5b992faad3506ac004503c11d25930cdca (patch) | |
| tree | a5a795b8980d90e4a10208ad4f8eabe140ee3e5e /app/gfx/canvas_linux.cc | |
| parent | f2a13d89ca22cdbe3808bcb14e02d5baee8d33b3 (diff) | |
| download | chromium_src-d07b6b5b992faad3506ac004503c11d25930cdca.zip chromium_src-d07b6b5b992faad3506ac004503c11d25930cdca.tar.gz chromium_src-d07b6b5b992faad3506ac004503c11d25930cdca.tar.bz2 | |
Move app/gfx/canvas and app/gfx/font to gfx/.
TBR=darin
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/1132006
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42312 0039d316-1c4b-4281-b951-d872f2087c98
Diffstat (limited to 'app/gfx/canvas_linux.cc')
| -rw-r--r-- | app/gfx/canvas_linux.cc | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/app/gfx/canvas_linux.cc b/app/gfx/canvas_linux.cc deleted file mode 100644 index fdd1242..0000000 --- a/app/gfx/canvas_linux.cc +++ /dev/null @@ -1,281 +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 "app/gfx/canvas.h" - -#include <cairo/cairo.h> -#include <gtk/gtk.h> -#include <pango/pango.h> -#include <pango/pangocairo.h> - -#include "app/gfx/font.h" -#include "base/logging.h" -#include "base/utf_string_conversions.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; - -// Returns the resolution used by pango. A negative values means the resolution -// hasn't been set. -static double GetPangoResolution() { - static double resolution; - static bool determined_resolution = false; - if (!determined_resolution) { - determined_resolution = true; - PangoContext* default_context = gdk_pango_context_get(); - resolution = pango_cairo_context_get_resolution(default_context); - g_object_unref(default_context); - } - return resolution; -} - -// 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 = 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_rgb(cr, - SkColorGetR(color) / 255.0, - SkColorGetG(color) / 255.0, - SkColorGetB(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 |