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295f920116
I wrote a script to do this which is attached to the bug. TBR=abarth@chromium.org BUG=435361 Review URL: https://codereview.chromium.org/736373003
101 lines
4.3 KiB
C++
101 lines
4.3 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_PUBLIC_WEB_WEBFONT_H_
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#define SKY_ENGINE_PUBLIC_WEB_WEBFONT_H_
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#include "../platform/WebCanvas.h"
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#include "../platform/WebColor.h"
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#include "../platform/WebCommon.h"
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namespace blink {
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struct WebFontDescription;
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struct WebFloatPoint;
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struct WebFloatRect;
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struct WebPoint;
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struct WebRect;
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struct WebTextRun;
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class WebFont {
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public:
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virtual ~WebFont() { }
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BLINK_EXPORT static WebFont* create(const WebFontDescription&);
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virtual WebFontDescription fontDescription() const = 0;
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virtual int ascent() const = 0;
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virtual int descent() const = 0;
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virtual int height() const = 0;
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virtual int lineSpacing() const = 0;
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virtual float xHeight() const = 0;
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// Draws the text run to the given canvas. The text is positioned at the
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// given left-hand point at the baseline.
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//
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// The text will be clipped to the given clip rect. |canvasIsOpaque| is
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// used to control whether subpixel antialiasing is possible. If there is a
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// possibility the area drawn could be semi-transparent, subpixel
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// antialiasing will be disabled.
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//
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// |from| and |to| allow the caller to specify a subrange of the given text
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// run to draw. If |to| is -1, the entire run will be drawn.
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virtual void drawText(WebCanvas*, const WebTextRun&, const WebFloatPoint& leftBaseline, WebColor,
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const WebRect& clip, bool canvasIsOpaque,
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int from = 0, int to = -1) const = 0;
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// Measures the width in pixels of the given text run.
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virtual int calculateWidth(const WebTextRun&) const = 0;
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// Returns the character offset corresponding to the given horizontal pixel
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// position as measured from from the left of the run.
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virtual int offsetForPosition(const WebTextRun&, float position) const = 0;
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// Returns the rectangle representing the selection rect for the subrange
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// |from| -> |to| of the given text run. You can use -1 for |to| to specify
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// the entire run (this will do something similar to calling width()).
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//
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// The rect will be positioned as if the text was drawn at the given
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// |leftBaseline| position. |height| indicates the height of the selection
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// rect you want, typically this will just be the height() of this font.
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//
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// To get the pixel offset of some character (the opposite of
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// offsetForPosition()), pass in a |leftBaseline| = (0, 0), |from| = 0, and
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// |to| = the character you want. The right edge of the resulting selection
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// rect will tell you the right side of the character.
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virtual WebFloatRect selectionRectForText(const WebTextRun&, const WebFloatPoint& leftBaseline,
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int height, int from = 0, int to = -1) const = 0;
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};
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} // namespace blink
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#endif // SKY_ENGINE_PUBLIC_WEB_WEBFONT_H_
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