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/*
* Copyright (C) 2012 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 "config.h"
#include "core/rendering/RenderThemeChromiumFontProvider.h"
#include "core/CSSValueKeywords.h"
#include "platform/fonts/FontDescription.h"
#include "platform/win/HWndDC.h"
#include "platform/win/SystemInfo.h"
#include "wtf/text/WTFString.h"
#include <windows.h>
#define SIZEOF_STRUCT_WITH_SPECIFIED_LAST_MEMBER(structName, member) \
offsetof(structName, member) + \
(sizeof static_cast<structName*>(0)->member)
#define NONCLIENTMETRICS_SIZE_PRE_VISTA \
SIZEOF_STRUCT_WITH_SPECIFIED_LAST_MEMBER(NONCLIENTMETRICS, lfMessageFont)
namespace WebCore {
static FontDescription& smallSystemFont()
{
DEFINE_STATIC_LOCAL(FontDescription, font, ());
return font;
}
static FontDescription& menuFont()
{
DEFINE_STATIC_LOCAL(FontDescription, font, ());
return font;
}
static FontDescription& labelFont()
{
DEFINE_STATIC_LOCAL(FontDescription, font, ());
return font;
}
// Converts |points| to pixels. One point is 1/72 of an inch.
static float pointsToPixels(float points)
{
static float pixelsPerInch = 0.0f;
if (!pixelsPerInch) {
HWndDC hdc(0); // What about printing? Is this the right DC?
if (hdc) // Can this ever actually be 0?
pixelsPerInch = GetDeviceCaps(hdc, LOGPIXELSY);
else
pixelsPerInch = 96.0f;
}
static const float pointsPerInch = 72.0f;
return points / pointsPerInch * pixelsPerInch;
}
static void getNonClientMetrics(NONCLIENTMETRICS* metrics)
{
static UINT size = isWindowsVistaOrGreater() ?
sizeof(NONCLIENTMETRICS) : NONCLIENTMETRICS_SIZE_PRE_VISTA;
metrics->cbSize = size;
bool success = !!SystemParametersInfo(SPI_GETNONCLIENTMETRICS, size, metrics, 0);
ASSERT(success);
}
// Return the height of system font |font| in pixels. We use this size by
// default for some non-form-control elements.
static float systemFontSize(const LOGFONT& font)
{
float size = -font.lfHeight;
if (size < 0) {
HFONT hFont = CreateFontIndirect(&font);
if (hFont) {
HWndDC hdc(0); // What about printing? Is this the right DC?
if (hdc) {
HGDIOBJ hObject = SelectObject(hdc, hFont);
TEXTMETRIC tm;
GetTextMetrics(hdc, &tm);
SelectObject(hdc, hObject);
size = tm.tmAscent;
}
DeleteObject(hFont);
}
}
// The "codepage 936" bit here is from Gecko; apparently this helps make
// fonts more legible in Simplified Chinese where the default font size is
// too small.
//
// FIXME: http://b/1119883 Since this is only used for "small caption",
// "menu", and "status bar" objects, I'm not sure how much this even
// matters. Plus the Gecko patch went in back in 2002, and maybe this
// isn't even relevant anymore. We should investigate whether this should
// be removed, or perhaps broadened to be "any CJK locale".
//
return ((size < 12.0f) && (GetACP() == 936)) ? 12.0f : size;
}
// static
void RenderThemeChromiumFontProvider::systemFont(CSSValueID valueID, FontDescription& fontDescription)
{
// This logic owes much to RenderThemeSafari.cpp.
FontDescription* cachedDesc = 0;
AtomicString faceName;
float fontSize = 0;
switch (valueID) {
case CSSValueSmallCaption:
cachedDesc = &smallSystemFont();
if (!smallSystemFont().isAbsoluteSize()) {
NONCLIENTMETRICS metrics;
getNonClientMetrics(&metrics);
faceName = AtomicString(metrics.lfSmCaptionFont.lfFaceName, wcslen(metrics.lfSmCaptionFont.lfFaceName));
fontSize = systemFontSize(metrics.lfSmCaptionFont);
}
break;
case CSSValueMenu:
cachedDesc = &menuFont();
if (!menuFont().isAbsoluteSize()) {
NONCLIENTMETRICS metrics;
getNonClientMetrics(&metrics);
faceName = AtomicString(metrics.lfMenuFont.lfFaceName, wcslen(metrics.lfMenuFont.lfFaceName));
fontSize = systemFontSize(metrics.lfMenuFont);
}
break;
case CSSValueStatusBar:
cachedDesc = &labelFont();
if (!labelFont().isAbsoluteSize()) {
NONCLIENTMETRICS metrics;
getNonClientMetrics(&metrics);
faceName = metrics.lfStatusFont.lfFaceName;
fontSize = systemFontSize(metrics.lfStatusFont);
}
break;
case CSSValueWebkitMiniControl:
case CSSValueWebkitSmallControl:
case CSSValueWebkitControl:
faceName = defaultGUIFont();
// Why 2 points smaller? Because that's what Gecko does.
fontSize = s_defaultFontSize - pointsToPixels(2);
break;
default:
faceName = defaultGUIFont();
fontSize = s_defaultFontSize;
break;
}
if (!cachedDesc)
cachedDesc = &fontDescription;
if (fontSize) {
cachedDesc->firstFamily().setFamily(faceName);
cachedDesc->setIsAbsoluteSize(true);
cachedDesc->setGenericFamily(FontDescription::NoFamily);
cachedDesc->setSpecifiedSize(fontSize);
cachedDesc->setWeight(FontWeightNormal);
cachedDesc->setStyle(FontStyleNormal);
}
fontDescription = *cachedDesc;
}
// static
void RenderThemeChromiumFontProvider::setDefaultFontSize(int fontSize)
{
s_defaultFontSize = static_cast<float>(fontSize);
// Reset cached fonts.
smallSystemFont() = menuFont() = labelFont() = FontDescription();
}
} // namespace WebCore
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