| // 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 "chrome/common/badge_util.h" |
| |
| #include <cmath> |
| |
| #include "base/logging.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "third_party/skia/include/core/SkPaint.h" |
| #include "third_party/skia/include/core/SkTypeface.h" |
| #include "ui/base/resource/resource_bundle.h" |
| #include "ui/gfx/canvas.h" |
| #include "ui/gfx/font.h" |
| #include "ui/gfx/rect.h" |
| #include "ui/gfx/size.h" |
| #include "ui/resources/grit/ui_resources.h" |
| |
| namespace { |
| |
| // Different platforms need slightly different constants to look good. |
| #if defined(OS_WIN) |
| const float kTextSize = 10; |
| const int kBottomMarginBrowserAction = 0; |
| const int kBottomMarginPageAction = 2; |
| const int kPadding = 2; |
| // The padding between the top of the badge and the top of the text. |
| const int kTopTextPadding = -1; |
| #elif defined(OS_MACOSX) |
| const float kTextSize = 9.0; |
| const int kBottomMarginBrowserAction = 5; |
| const int kBottomMarginPageAction = 2; |
| const int kPadding = 2; |
| const int kTopTextPadding = 0; |
| #elif defined(OS_CHROMEOS) |
| const float kTextSize = 8.0; |
| const int kBottomMarginBrowserAction = 0; |
| const int kBottomMarginPageAction = 2; |
| const int kPadding = 2; |
| const int kTopTextPadding = 1; |
| #elif defined(OS_POSIX) |
| const float kTextSize = 9.0; |
| const int kBottomMarginBrowserAction = 0; |
| const int kBottomMarginPageAction = 2; |
| const int kPadding = 2; |
| const int kTopTextPadding = 0; |
| #endif |
| |
| const int kBadgeHeight = 11; |
| const int kMaxTextWidth = 23; |
| |
| // The minimum width for center-aligning the badge. |
| const int kCenterAlignThreshold = 20; |
| |
| } // namespace |
| |
| namespace badge_util { |
| |
| SkPaint* GetBadgeTextPaintSingleton() { |
| #if defined(OS_MACOSX) |
| const char kPreferredTypeface[] = "Helvetica Bold"; |
| #else |
| const char kPreferredTypeface[] = "Arial"; |
| #endif |
| |
| static SkPaint* text_paint = NULL; |
| if (!text_paint) { |
| text_paint = new SkPaint; |
| text_paint->setAntiAlias(true); |
| text_paint->setTextAlign(SkPaint::kLeft_Align); |
| |
| skia::RefPtr<SkTypeface> typeface = skia::AdoptRef( |
| SkTypeface::CreateFromName(kPreferredTypeface, SkTypeface::kBold)); |
| // Skia doesn't do any font fallback---if the user is missing the font then |
| // typeface will be NULL. If we don't do manual fallback then we'll crash. |
| if (typeface) { |
| text_paint->setFakeBoldText(true); |
| } else { |
| // Fall back to the system font. We don't bold it because we aren't sure |
| // how it will look. |
| // For the most part this code path will only be hit on Linux systems |
| // that don't have Arial. |
| ResourceBundle& rb = ResourceBundle::GetSharedInstance(); |
| const gfx::Font& base_font = rb.GetFont(ResourceBundle::BaseFont); |
| typeface = skia::AdoptRef(SkTypeface::CreateFromName( |
| base_font.GetFontName().c_str(), SkTypeface::kNormal)); |
| DCHECK(typeface); |
| } |
| |
| text_paint->setTypeface(typeface.get()); |
| // |text_paint| adds its own ref. Release the ref from CreateFontName. |
| } |
| return text_paint; |
| } |
| |
| void PaintBadge(gfx::Canvas* canvas, |
| const gfx::Rect& bounds, |
| const std::string& text, |
| const SkColor& text_color_in, |
| const SkColor& background_color_in, |
| int icon_width, |
| extensions::ActionInfo::Type action_type) { |
| if (text.empty()) |
| return; |
| |
| SkColor text_color = text_color_in; |
| if (SkColorGetA(text_color_in) == 0x00) |
| text_color = SK_ColorWHITE; |
| |
| SkColor background_color = background_color_in; |
| if (SkColorGetA(background_color_in) == 0x00) |
| background_color = SkColorSetARGB(255, 218, 0, 24); |
| |
| canvas->Save(); |
| |
| SkPaint* text_paint = badge_util::GetBadgeTextPaintSingleton(); |
| text_paint->setColor(text_color); |
| float scale = canvas->image_scale(); |
| |
| // Calculate text width. Font width may not be linear with respect to the |
| // scale factor (e.g. when hinting is applied), so we need to use the font |
| // size that canvas actually uses when drawing a text. |
| text_paint->setTextSize(SkFloatToScalar(kTextSize) * scale); |
| SkScalar sk_text_width_in_pixel = |
| text_paint->measureText(text.c_str(), text.size()); |
| text_paint->setTextSize(SkFloatToScalar(kTextSize)); |
| |
| // We clamp the width to a max size. SkPaint::measureText returns the width in |
| // pixel (as a result of scale multiplier), so convert sk_text_width_in_pixel |
| // back to DIP (density independent pixel) first. |
| int text_width = |
| std::min(kMaxTextWidth, |
| static_cast<int>( |
| std::ceil(SkScalarToFloat(sk_text_width_in_pixel) / scale))); |
| |
| // Calculate badge size. It is clamped to a min width just because it looks |
| // silly if it is too skinny. |
| int badge_width = text_width + kPadding * 2; |
| // Force the pixel width of badge to be either odd (if the icon width is odd) |
| // or even otherwise. If there is a mismatch you get http://crbug.com/26400. |
| if (icon_width != 0 && (badge_width % 2 != icon_width % 2)) |
| badge_width += 1; |
| badge_width = std::max(kBadgeHeight, badge_width); |
| |
| // Paint the badge background color in the right location. It is usually |
| // right-aligned, but it can also be center-aligned if it is large. |
| int rect_height = kBadgeHeight; |
| int bottom_margin = |
| action_type == extensions::ActionInfo::TYPE_BROWSER ? |
| kBottomMarginBrowserAction : kBottomMarginPageAction; |
| int rect_y = bounds.bottom() - bottom_margin - kBadgeHeight; |
| int rect_width = badge_width; |
| int rect_x = (badge_width >= kCenterAlignThreshold) ? |
| bounds.x() + (bounds.width() - badge_width) / 2 : |
| bounds.right() - badge_width; |
| gfx::Rect rect(rect_x, rect_y, rect_width, rect_height); |
| |
| SkPaint rect_paint; |
| rect_paint.setStyle(SkPaint::kFill_Style); |
| rect_paint.setAntiAlias(true); |
| rect_paint.setColor(background_color); |
| canvas->DrawRoundRect(rect, 2, rect_paint); |
| |
| // Overlay the gradient. It is stretchy, so we do this in three parts. |
| ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance(); |
| gfx::ImageSkia* gradient_left = rb.GetImageSkiaNamed( |
| IDR_BROWSER_ACTION_BADGE_LEFT); |
| gfx::ImageSkia* gradient_right = rb.GetImageSkiaNamed( |
| IDR_BROWSER_ACTION_BADGE_RIGHT); |
| gfx::ImageSkia* gradient_center = rb.GetImageSkiaNamed( |
| IDR_BROWSER_ACTION_BADGE_CENTER); |
| |
| canvas->DrawImageInt(*gradient_left, rect.x(), rect.y()); |
| canvas->TileImageInt(*gradient_center, |
| rect.x() + gradient_left->width(), |
| rect.y(), |
| rect.width() - gradient_left->width() - gradient_right->width(), |
| rect.height()); |
| canvas->DrawImageInt(*gradient_right, |
| rect.right() - gradient_right->width(), rect.y()); |
| |
| // Finally, draw the text centered within the badge. We set a clip in case the |
| // text was too large. |
| rect.Inset(kPadding, 0); |
| canvas->ClipRect(rect); |
| canvas->sk_canvas()->drawText( |
| text.c_str(), text.size(), |
| SkFloatToScalar(rect.x() + |
| static_cast<float>(rect.width() - text_width) / 2), |
| SkFloatToScalar(rect.y() + kTextSize + kTopTextPadding), |
| *text_paint); |
| canvas->Restore(); |
| } |
| |
| } // namespace badge_util |