ChromeCanvas->gfx::Canvas

app/gfx/chrome_canvas_linux.cc

-// 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/chrome_canvas.h"
-
-#include <pango/pango.h>
-
-#include "app/gfx/chrome_font.h"
-#include "base/gfx/rect.h"
-#include "base/logging.h"
-#include "base/string_util.h"
-
-namespace {
-
-// Returns a new pango font, free with pango_font_description_free().
-PangoFontDescription* PangoFontFromGfxFont(const gfx::Font& gfx_font) {
-  gfx::Font font = gfx_font;  // Copy so we can call non-const methods.
-  PangoFontDescription* pfd = pango_font_description_new();
-  pango_font_description_set_family(pfd, WideToUTF8(font.FontName()).c_str());
-  pango_font_description_set_size(pfd, font.FontSize() * PANGO_SCALE);
-
-  switch (font.style()) {
-    case gfx::Font::NORMAL:
-      // Nothing to do, should already be PANGO_STYLE_NORMAL.
-      break;
-    case gfx::Font::BOLD:
-      pango_font_description_set_weight(pfd, PANGO_WEIGHT_BOLD);
-      break;
-    case gfx::Font::ITALIC:
-      pango_font_description_set_style(pfd, PANGO_STYLE_ITALIC);
-      break;
-    case gfx::Font::UNDERLINED:
-      // TODO(deanm): How to do underlined?  Where do we use it?  Probably have
-      // to paint it ourselves, see pango_font_metrics_get_underline_position.
-      break;
-  }
-
-  return pfd;
-}
-
-}  // namespace
-
-ChromeCanvas::ChromeCanvas(int width, int height, bool is_opaque)
-    : skia::PlatformCanvasLinux(width, height, is_opaque) {
-}
-
-ChromeCanvas::ChromeCanvas() : skia::PlatformCanvasLinux() {
-}
-
-ChromeCanvas::~ChromeCanvas() {
-}
-
-// static
-void ChromeCanvas::SizeStringInt(const std::wstring& text,
-                                 const gfx::Font& font,
-                                 int* width, int* height, int flags) {
-  NOTIMPLEMENTED();
-}
-
-void ChromeCanvas::ApplySkiaMatrixToCairoContext(cairo_t* cr) {
-  const SkMatrix& skia_matrix = getTotalMatrix();
-  cairo_matrix_t cairo_matrix;
-  cairo_matrix_init(&cairo_matrix,
-                    SkScalarToFloat(skia_matrix.getScaleX()),
-                    SkScalarToFloat(skia_matrix.getSkewY()),
-                    SkScalarToFloat(skia_matrix.getSkewX()),
-                    SkScalarToFloat(skia_matrix.getScaleY()),
-                    SkScalarToFloat(skia_matrix.getTranslateX()),
-                    SkScalarToFloat(skia_matrix.getTranslateY()));
-  cairo_set_matrix(cr, &cairo_matrix);
-}
-
-void ChromeCanvas::DrawStringInt(const std::wstring& text,
-                                 const gfx::Font& font,
-                                 const SkColor& color, int x, int y, int w,
-                                 int h, int flags) {
-  cairo_surface_t* surface = beginPlatformPaint();
-  cairo_t* cr = cairo_create(surface);
-  // We're going to draw onto the surface directly. This circumvents the matrix
-  // installed by Skia. Apply the matrix from skia to cairo so they align and
-  // we draw at the right place.
-  ApplySkiaMatrixToCairoContext(cr);
-  PangoLayout* layout = pango_cairo_create_layout(cr);
-
-  cairo_set_source_rgb(cr,
-                       SkColorGetR(color) / 255.0,
-                       SkColorGetG(color) / 255.0,
-                       SkColorGetB(color) / 255.0);
-
-  // TODO(deanm): Implement the rest of the ChromeCanvas flags.
-  if (!(flags & ChromeCanvas::NO_ELLIPSIS))
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
-
-  pango_layout_set_width(layout, w * PANGO_SCALE);
-  pango_layout_set_height(layout, h * PANGO_SCALE);
-
-  if (flags & TEXT_ALIGN_CENTER) {
-    pango_layout_set_alignment(layout, PANGO_ALIGN_CENTER);
-  } else if (flags & TEXT_ALIGN_RIGHT) {
-    pango_layout_set_alignment(layout, PANGO_ALIGN_RIGHT);
-  }
-
-  if (flags & MULTI_LINE) {
-    pango_layout_set_wrap(layout,
-        (flags & CHARACTER_BREAK) ? PANGO_WRAP_WORD_CHAR : PANGO_WRAP_WORD);
-  }
-
-  if (flags & NO_ELLIPSIS)
-    pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_NONE);
-
-  std::string utf8 = WideToUTF8(text);
-  pango_layout_set_text(layout, utf8.data(), utf8.size());
-
-  PangoFontDescription* desc = PangoFontFromGfxFont(font);
-  pango_layout_set_font_description(layout, desc);
-  pango_font_description_free(desc);
-
-  int width, height;
-  pango_layout_get_size(layout, &width, &height);
-
-  if (flags & ChromeCanvas::TEXT_VALIGN_TOP) {
-    // Cairo should draw from the top left corner already.
-  } else if (flags & ChromeCanvas::TEXT_VALIGN_BOTTOM) {
-    y = y + (h - (height / PANGO_SCALE));
-  } else {
-    // Vertically centered.
-    y = y + ((h - (height / PANGO_SCALE)) / 2);
-  }
-
-  cairo_move_to(cr, x, y);
-  pango_cairo_show_layout(cr, layout);
-
-  g_object_unref(layout);
-  cairo_destroy(cr);
-  // NOTE: beginPlatformPaint returned its surface, we shouldn't destroy it.
-}