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/*
* Copyright 2009, The Android Open Source Project
*
* 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.
*
* 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.
*/
#ifndef android_EmojiFont_DEFINED
#define android_EmojiFont_DEFINED
#include "SkScalar.h"
#include "SkUtils.h"
class SkCanvas;
class SkPaint;
namespace android {
class EmojiFont {
public:
/** Returns true if the underlying emoji font mechanism is available.
*/
static bool IsAvailable();
/** Return index for the corresponding index to the emoji table, or 0
if there is no matching emoji form.
*/
static uint16_t UnicharToGlyph(int32_t unichar);
/** Returns true if the specified glyph is in the emoji range, i.e. was
returned by UnicharToGlyph or UTF16ToGlyph.
*/
static bool IsEmojiGlyph(uint16_t index) {
return index >= kGlyphBase;
}
/** Returns the advance width for the specified emoji form.
*/
static SkScalar GetAdvanceWidth(uint16_t index, const SkPaint& paint);
/** Draw the specified emoji form, given the x,y origin of the text
version. The paint is the one associated with the text that has
the emoji in it.
*/
static void Draw(SkCanvas*, uint16_t index, SkScalar x, SkScalar y,
const SkPaint& paint);
private:
enum {
/* this is our internal trick to embedded private emoji glyph IDs
along side normal glyphs IDs that come from real fonts. The
assumption is that normal fonts never will report a glyph ID
above 20K or 30K, so 64000 should always be a safe starting
index. We also assume the the number of emoji will not overflow
16bits starting at 64000 i.e. 65535 - 64000 > total emoji count
*/
kGlyphBase = 64000
};
};
}
#endif
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