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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "chrome/common/gfx/chrome_font.h"
#include <algorithm>
#include <math.h>
#include "base/logging.h"
#include "base/win_util.h"
#include "chrome/app/locales/locale_settings.h"
#include "chrome/common/l10n_util.h"
#include "generated_resources.h"
/*static*/
ChromeFont::HFontRef* ChromeFont::base_font_ref_;
// If the tmWeight field of a TEXTMETRIC structure has a value >= this, the
// font is bold.
static const int kTextMetricWeightBold = 700;
//
// ChromeFont
//
// static
ChromeFont ChromeFont::CreateFont(HFONT font) {
DCHECK(font);
LOGFONT font_info;
GetObject(font, sizeof(LOGFONT), &font_info);
return ChromeFont(CreateHFontRef(CreateFontIndirect(&font_info)));
}
ChromeFont ChromeFont::CreateFont(const std::wstring& font_name,
int font_size) {
HDC hdc = GetDC(NULL);
long lf_height = -MulDiv(font_size, GetDeviceCaps(hdc, LOGPIXELSY), 72);
ReleaseDC(NULL, hdc);
HFONT hf = ::CreateFont(lf_height, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
font_name.c_str());
return ChromeFont::CreateFont(hf);
}
// static
ChromeFont::HFontRef* ChromeFont::GetBaseFontRef() {
if (base_font_ref_ == NULL) {
NONCLIENTMETRICS metrics;
win_util::GetNonClientMetrics(&metrics);
// See comment in ChromeFont::DeriveFont() about font size.
DCHECK_GE(abs(metrics.lfMessageFont.lfHeight), 5);
HFONT font = CreateFontIndirect(&metrics.lfMessageFont);
DLOG_ASSERT(font);
base_font_ref_ = ChromeFont::CreateHFontRef(font);
// base_font_ref_ is global, up the ref count so it's never deleted.
base_font_ref_->AddRef();
}
return base_font_ref_;
}
std::wstring ChromeFont::FontName() {
LOGFONT font_info;
GetObject(hfont(), sizeof(LOGFONT), &font_info);
return (std::wstring(font_info.lfFaceName));
}
int ChromeFont::FontSize() {
LOGFONT font_info;
GetObject(hfont(), sizeof(LOGFONT), &font_info);
long lf_height = font_info.lfHeight;
HDC hdc = GetDC(NULL);
int device_caps = GetDeviceCaps(hdc, LOGPIXELSY);
int font_size = 0;
if (device_caps != 0) {
float font_size_float = -static_cast<float>(lf_height)*72/device_caps;
font_size = static_cast<int>(::ceil(font_size_float - 0.5));
}
ReleaseDC(NULL, hdc);
return font_size;
}
ChromeFont ChromeFont::DeriveFont(int size_delta, int style) const {
LOGFONT font_info;
GetObject(hfont(), sizeof(LOGFONT), &font_info);
// LOGFONT returns two types of font heights, negative is measured slightly
// differently (character height, vs cell height).
if (font_info.lfHeight < 0) {
font_info.lfHeight -= size_delta;
} else {
font_info.lfHeight += size_delta;
}
// Even with "Small Fonts", the smallest readable font size is 5. It is easy
// to create a non-drawing font and forget about the fact that text should be
// drawn in the UI. This test ensures that the font will be readable.
DCHECK_GE(abs(font_info.lfHeight), 5);
font_info.lfUnderline = ((style & UNDERLINED) == UNDERLINED);
font_info.lfItalic = ((style & ITALIC) == ITALIC);
font_info.lfWeight = (style & BOLD) ? FW_BOLD : FW_NORMAL;
if (style & WEB) {
font_info.lfPitchAndFamily = FF_SWISS;
wcscpy_s(font_info.lfFaceName,
l10n_util::GetString(IDS_WEB_FONT_FAMILY).c_str());
}
HFONT hfont = CreateFontIndirect(&font_info);
return ChromeFont(CreateHFontRef(hfont));
}
int ChromeFont::GetStringWidth(const std::wstring& text) const {
int width = 0;
HDC dc = GetDC(NULL);
HFONT previous_font = static_cast<HFONT>(SelectObject(dc, hfont()));
SIZE size;
if (GetTextExtentPoint32(dc, text.c_str(), static_cast<int>(text.size()),
&size)) {
width = size.cx;
} else {
width = 0;
}
SelectObject(dc, previous_font);
ReleaseDC(NULL, dc);
return width;
}
ChromeFont::HFontRef* ChromeFont::CreateHFontRef(HFONT font) {
TEXTMETRIC font_metrics;
HDC screen_dc = GetDC(NULL);
HFONT previous_font = static_cast<HFONT>(SelectObject(screen_dc, font));
int last_map_mode = SetMapMode(screen_dc, MM_TEXT);
GetTextMetrics(screen_dc, &font_metrics);
// Yes, this is how Microsoft recommends calculating the dialog unit
// conversions.
SIZE ave_text_size;
GetTextExtentPoint32(screen_dc,
L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz",
52, &ave_text_size);
const int dlu_base_x = (ave_text_size.cx / 26 + 1) / 2;
// To avoid the DC referencing font_handle_, select the previous font.
SelectObject(screen_dc, previous_font);
SetMapMode(screen_dc, last_map_mode);
ReleaseDC(NULL, screen_dc);
const int height = std::max(1, static_cast<int>(font_metrics.tmHeight));
const int baseline = std::max(1, static_cast<int>(font_metrics.tmAscent));
const int ave_char_width =
std::max(1, static_cast<int>(font_metrics.tmAveCharWidth));
int style = 0;
if (font_metrics.tmItalic) {
style |= ChromeFont::ITALIC;
}
if (font_metrics.tmUnderlined) {
style |= ChromeFont::UNDERLINED;
}
if (font_metrics.tmWeight >= kTextMetricWeightBold) {
style |= ChromeFont::BOLD;
}
return new HFontRef(font, height, baseline, ave_char_width, style,
dlu_base_x);
}
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