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/*
* Copyright (C) 2006, 2007 Apple Computer, Inc.
* Copyright (c) 2006, 2007, 2008, 2009, 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:
*
* * 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 "third_party/blink/renderer/platform/fonts/font_platform_data.h"
#include <windows.h>
#include "SkTypeface.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h"
#include "third_party/blink/renderer/platform/layout_test_support.h"
namespace blink {
// Maximum font size, in pixels, at which embedded bitmaps will be used
// if available.
const float kMaxSizeForEmbeddedBitmap = 24.0f;
void FontPlatformData::SetupPaintFont(PaintFont* font,
float,
const Font*) const {
const float ts = text_size_ >= 0 ? text_size_ : 12;
font->SetTextSize(SkFloatToScalar(text_size_));
font->SetTypeface(paint_typeface_);
font->SetFakeBoldText(synthetic_bold_);
font->SetTextSkewX(synthetic_italic_ ? -SK_Scalar1 / 4 : 0);
uint32_t text_flags = PaintTextFlags();
uint32_t flags = font->flags();
static const uint32_t kTextFlagsMask =
SkPaint::kAntiAlias_Flag | SkPaint::kLCDRenderText_Flag |
SkPaint::kEmbeddedBitmapText_Flag | SkPaint::kSubpixelText_Flag;
flags &= ~kTextFlagsMask;
if (ts <= kMaxSizeForEmbeddedBitmap)
flags |= SkPaint::kEmbeddedBitmapText_Flag;
// Only use sub-pixel positioning if anti aliasing is enabled. Otherwise,
// without font smoothing, subpixel text positioning leads to uneven spacing
// since subpixel test placement coordinates would be passed to Skia, which
// only has non-antialiased glyphs to draw, so they necessarily get clamped at
// pixel positions, which leads to uneven spacing, either too close or too far
// away from adjacent glyphs. We avoid this by linking the two flags.
if (text_flags & SkPaint::kAntiAlias_Flag)
flags |= SkPaint::kSubpixelText_Flag;
if (LayoutTestSupport::IsRunningLayoutTest() &&
!LayoutTestSupport::IsTextSubpixelPositioningAllowedForTest())
flags &= ~SkPaint::kSubpixelText_Flag;
SkASSERT(!(text_flags & ~kTextFlagsMask));
flags |= text_flags;
font->SetFlags(flags);
font->SetEmbeddedBitmapText(!avoid_embedded_bitmaps_);
}
static bool IsWebFont(const String& family_name) {
// Web-fonts have artifical names constructed to always be:
// 1. 24 characters, followed by a '\0'
// 2. the last two characters are '=='
return family_name.length() == 24 && '=' == family_name[22] &&
'=' == family_name[23];
}
static int ComputePaintTextFlags(String font_family_name) {
if (LayoutTestSupport::IsRunningLayoutTest())
return LayoutTestSupport::IsFontAntialiasingEnabledForTest()
? SkPaint::kAntiAlias_Flag
: 0;
int text_flags = 0;
if (FontCache::GetFontCache()->AntialiasedTextEnabled()) {
int lcd_flag = FontCache::GetFontCache()->LcdTextEnabled()
? SkPaint::kLCDRenderText_Flag
: 0;
text_flags = SkPaint::kAntiAlias_Flag | lcd_flag;
}
// Many web-fonts are so poorly hinted that they are terrible to read when
// drawn in BW. In these cases, we have decided to FORCE these fonts to be
// drawn with at least grayscale AA, even when the System (getSystemTextFlags)
// tells us to draw only in BW.
if (IsWebFont(font_family_name))
text_flags |= SkPaint::kAntiAlias_Flag;
return text_flags;
}
void FontPlatformData::QuerySystemForRenderStyle() {
paint_text_flags_ = ComputePaintTextFlags(FontFamilyName());
}
} // namespace blink
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