Introduce get_extent support for color bitmap font. (#351)
hb_font_get_glyph_extents now works for color bitmap fonts. Currently only font having index format 1 and image format 17 is supported.pull/372/head
Seigo Nonaka
8 years ago
committed by
Behdad Esfahbod
parent
261837e720
commit
831852594b
3 changed files with 290 additions and 0 deletions
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/*
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* Copyright © 2016 Google, Inc. |
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* |
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* This is part of HarfBuzz, a text shaping library. |
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* |
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* Permission is hereby granted, without written agreement and without |
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* license or royalty fees, to use, copy, modify, and distribute this |
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* software and its documentation for any purpose, provided that the |
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* above copyright notice and the following two paragraphs appear in |
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* all copies of this software. |
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* |
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
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* DAMAGE. |
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* |
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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* |
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* Google Author(s): Seigo Nonaka |
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*/ |
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#ifndef HB_OT_EBDT_TABLE_HH |
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#define HB_OT_EBDT_TABLE_HH |
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#include "hb-open-type-private.hh" |
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namespace OT { |
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struct SmallGlyphMetrics |
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{ |
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BYTE height; |
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BYTE width; |
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int8_t bearingX; |
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int8_t bearingY; |
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BYTE advance; |
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DEFINE_SIZE_STATIC(5); |
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}; |
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struct SBitLineMetrics { |
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int8_t ascender; |
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int8_t decender; |
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BYTE widthMax; |
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int8_t caretSlopeNumerator; |
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int8_t caretSlopeDenominator; |
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int8_t caretOffset; |
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int8_t minOriginSB; |
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int8_t minAdvanceSB; |
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int8_t maxBeforeBL; |
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int8_t minAfterBL; |
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int8_t padding1; |
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int8_t padding2; |
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DEFINE_SIZE_STATIC(12); |
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}; |
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struct BitmapSizeTable |
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{ |
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ULONG indexSubtableArrayOffset; |
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ULONG indexTablesSize; |
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ULONG numberOfIndexSubtables; |
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ULONG colorRef; |
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SBitLineMetrics horizontal; |
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SBitLineMetrics vertical; |
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USHORT startGlyphIndex; |
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USHORT endGlyphIndex; |
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BYTE ppemX; |
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BYTE ppemY; |
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BYTE bitDepth; |
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int8_t flags; |
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DEFINE_SIZE_STATIC(48); |
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}; |
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/*
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* Index Subtables. |
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*/ |
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struct IndexSubtable |
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{ |
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USHORT firstGlyphIndex; |
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USHORT lastGlyphIndex; |
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ULONG offsetToSubtable; |
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DEFINE_SIZE_STATIC(8); |
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}; |
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struct IndexSubHeader |
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{ |
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USHORT indexFormat; |
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USHORT imageFormat; |
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ULONG imageDataOffset; |
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}; |
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struct IndexSubtableFormat1 |
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{ |
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IndexSubHeader header; |
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ULONG offsetArray[VAR]; |
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}; |
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/*
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* Glyph Bitmap Data Formats. |
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*/ |
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struct GlyphBitmapDataFormat17 |
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{ |
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SmallGlyphMetrics glyphMetrics; |
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ULONG dataLen; |
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BYTE data[VAR]; |
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}; |
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struct IndexSubtableArray |
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{ |
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public: |
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const IndexSubtable* find_table(hb_codepoint_t glyph, unsigned int numTables) const |
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{ |
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for (unsigned int i = 0; i < numTables; ++i) { |
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unsigned int firstGlyphIndex = indexSubtables[i].firstGlyphIndex; |
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unsigned int lastGlyphIndex = indexSubtables[i].lastGlyphIndex; |
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if (firstGlyphIndex <= glyph && glyph <= lastGlyphIndex) { |
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return &indexSubtables[i]; |
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} |
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} |
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return NULL; |
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} |
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protected: |
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IndexSubtable indexSubtables[VAR]; |
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}; |
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/*
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* CBLC -- Color Bitmap Location Table |
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*/ |
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#define HB_OT_TAG_CBLC HB_TAG('C','B','L','C') |
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struct CBLC |
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{ |
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static const hb_tag_t tableTag = HB_OT_TAG_CBLC; |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (true); |
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} |
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public: |
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const BitmapSizeTable* find_table(hb_codepoint_t glyph) const |
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{ |
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// TODO: Make it possible to select strike.
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const uint32_t tableSize = numSizes; |
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for (uint32_t i = 0; i < tableSize; ++i) { |
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unsigned int startGlyphIndex = sizeTables[i].startGlyphIndex; |
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unsigned int endGlyphIndex = sizeTables[i].endGlyphIndex; |
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if (startGlyphIndex <= glyph && glyph <= endGlyphIndex) { |
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return &sizeTables[i]; |
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} |
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} |
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return NULL; |
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} |
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protected: |
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ULONG version; |
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ULONG numSizes; |
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BitmapSizeTable sizeTables[VAR]; |
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}; |
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/*
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* CBDT -- Color Bitmap Data Table |
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*/ |
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#define HB_OT_TAG_CBDT HB_TAG('C','B','D','T') |
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struct CBDT |
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{ |
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static const hb_tag_t tableTag = HB_OT_TAG_CBDT; |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (true); |
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} |
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protected: |
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BYTE data[VAR]; |
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}; |
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} /* namespace OT */ |
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#endif /* HB_OT_EBDT_TABLE_HH */ |
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