summaryrefslogtreecommitdiffstats
path: root/gfx/harfbuzz/src/hb-ot-cbdt-table.hh
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-cbdt-table.hh')
-rw-r--r--gfx/harfbuzz/src/hb-ot-cbdt-table.hh384
1 files changed, 384 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-cbdt-table.hh b/gfx/harfbuzz/src/hb-ot-cbdt-table.hh
new file mode 100644
index 000000000..52897abd3
--- /dev/null
+++ b/gfx/harfbuzz/src/hb-ot-cbdt-table.hh
@@ -0,0 +1,384 @@
+/*
+ * Copyright © 2016 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Seigo Nonaka
+ */
+
+#ifndef HB_OT_CBDT_TABLE_HH
+#define HB_OT_CBDT_TABLE_HH
+
+#include "hb-open-type-private.hh"
+
+namespace OT {
+
+struct SmallGlyphMetrics
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ inline void get_extents (hb_glyph_extents_t *extents) const
+ {
+ extents->x_bearing = bearingX;
+ extents->y_bearing = bearingY;
+ extents->width = width;
+ extents->height = -height;
+ }
+
+ BYTE height;
+ BYTE width;
+ CHAR bearingX;
+ CHAR bearingY;
+ BYTE advance;
+
+ DEFINE_SIZE_STATIC(5);
+};
+
+struct BigGlyphMetrics : SmallGlyphMetrics
+{
+ CHAR vertBearingX;
+ CHAR vertBearingY;
+ BYTE vertAdvance;
+
+ DEFINE_SIZE_STATIC(8);
+};
+
+struct SBitLineMetrics
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ CHAR ascender;
+ CHAR decender;
+ BYTE widthMax;
+ CHAR caretSlopeNumerator;
+ CHAR caretSlopeDenominator;
+ CHAR caretOffset;
+ CHAR minOriginSB;
+ CHAR minAdvanceSB;
+ CHAR maxBeforeBL;
+ CHAR minAfterBL;
+ CHAR padding1;
+ CHAR padding2;
+
+ DEFINE_SIZE_STATIC(12);
+};
+
+
+/*
+ * Index Subtables.
+ */
+
+struct IndexSubtableHeader
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ USHORT indexFormat;
+ USHORT imageFormat;
+ ULONG imageDataOffset;
+
+ DEFINE_SIZE_STATIC(8);
+};
+
+template <typename OffsetType>
+struct IndexSubtableFormat1Or3
+{
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int glyph_count) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ c->check_array (offsetArrayZ, offsetArrayZ[0].static_size, glyph_count + 1));
+ }
+
+ bool get_image_data (unsigned int idx,
+ unsigned int *offset,
+ unsigned int *length) const
+ {
+ if (unlikely (offsetArrayZ[idx + 1] <= offsetArrayZ[idx]))
+ return false;
+
+ *offset = header.imageDataOffset + offsetArrayZ[idx];
+ *length = offsetArrayZ[idx + 1] - offsetArrayZ[idx];
+ return true;
+ }
+
+ IndexSubtableHeader header;
+ Offset<OffsetType> offsetArrayZ[VAR];
+
+ DEFINE_SIZE_ARRAY(8, offsetArrayZ);
+};
+
+struct IndexSubtableFormat1 : IndexSubtableFormat1Or3<ULONG> {};
+struct IndexSubtableFormat3 : IndexSubtableFormat1Or3<USHORT> {};
+
+struct IndexSubtable
+{
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int glyph_count) const
+ {
+ TRACE_SANITIZE (this);
+ if (!u.header.sanitize (c)) return_trace (false);
+ switch (u.header.indexFormat) {
+ case 1: return_trace (u.format1.sanitize (c, glyph_count));
+ case 3: return_trace (u.format3.sanitize (c, glyph_count));
+ default:return_trace (true);
+ }
+ }
+
+ inline bool get_extents (hb_glyph_extents_t *extents) const
+ {
+ switch (u.header.indexFormat) {
+ case 2: case 5: /* TODO */
+ case 1: case 3: case 4: /* Variable-metrics formats do not have metrics here. */
+ default:return (false);
+ }
+ }
+
+ bool get_image_data (unsigned int idx,
+ unsigned int *offset,
+ unsigned int *length,
+ unsigned int *format) const
+ {
+ *format = u.header.imageFormat;
+ switch (u.header.indexFormat) {
+ case 1: return u.format1.get_image_data (idx, offset, length);
+ case 3: return u.format3.get_image_data (idx, offset, length);
+ default: return false;
+ }
+ }
+
+ protected:
+ union {
+ IndexSubtableHeader header;
+ IndexSubtableFormat1 format1;
+ IndexSubtableFormat3 format3;
+ /* TODO: Format 2, 4, 5. */
+ } u;
+ public:
+ DEFINE_SIZE_UNION (8, header);
+};
+
+struct IndexSubtableRecord
+{
+ inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ firstGlyphIndex <= lastGlyphIndex &&
+ offsetToSubtable.sanitize (c, this, lastGlyphIndex - firstGlyphIndex + 1));
+ }
+
+ inline bool get_extents (hb_glyph_extents_t *extents) const
+ {
+ return (this+offsetToSubtable).get_extents (extents);
+ }
+
+ bool get_image_data (unsigned int gid,
+ unsigned int *offset,
+ unsigned int *length,
+ unsigned int *format) const
+ {
+ if (gid < firstGlyphIndex || gid > lastGlyphIndex)
+ {
+ return false;
+ }
+ return (this+offsetToSubtable).get_image_data (gid - firstGlyphIndex,
+ offset, length, format);
+ }
+
+ USHORT firstGlyphIndex;
+ USHORT lastGlyphIndex;
+ OffsetTo<IndexSubtable, ULONG> offsetToSubtable;
+
+ DEFINE_SIZE_STATIC(8);
+};
+
+struct IndexSubtableArray
+{
+ inline bool sanitize (hb_sanitize_context_t *c, unsigned int count) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!c->check_array (&indexSubtablesZ, indexSubtablesZ[0].static_size, count)))
+ return_trace (false);
+ for (unsigned int i = 0; i < count; i++)
+ if (unlikely (!indexSubtablesZ[i].sanitize (c, this)))
+ return_trace (false);
+ return_trace (true);
+ }
+
+ public:
+ const IndexSubtableRecord* find_table (hb_codepoint_t glyph, unsigned int numTables) const
+ {
+ for (unsigned int i = 0; i < numTables; ++i)
+ {
+ unsigned int firstGlyphIndex = indexSubtablesZ[i].firstGlyphIndex;
+ unsigned int lastGlyphIndex = indexSubtablesZ[i].lastGlyphIndex;
+ if (firstGlyphIndex <= glyph && glyph <= lastGlyphIndex) {
+ return &indexSubtablesZ[i];
+ }
+ }
+ return NULL;
+ }
+
+ protected:
+ IndexSubtableRecord indexSubtablesZ[VAR];
+
+ public:
+ DEFINE_SIZE_ARRAY(0, indexSubtablesZ);
+};
+
+struct BitmapSizeTable
+{
+ friend struct CBLC;
+
+ inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ indexSubtableArrayOffset.sanitize (c, base, numberOfIndexSubtables) &&
+ c->check_range (&(base+indexSubtableArrayOffset), indexTablesSize) &&
+ horizontal.sanitize (c) &&
+ vertical.sanitize (c));
+ }
+
+ const IndexSubtableRecord *find_table (hb_codepoint_t glyph, const void *base) const
+ {
+ return (base+indexSubtableArrayOffset).find_table (glyph, numberOfIndexSubtables);
+ }
+
+ protected:
+ OffsetTo<IndexSubtableArray, ULONG> indexSubtableArrayOffset;
+ ULONG indexTablesSize;
+ ULONG numberOfIndexSubtables;
+ ULONG colorRef;
+ SBitLineMetrics horizontal;
+ SBitLineMetrics vertical;
+ USHORT startGlyphIndex;
+ USHORT endGlyphIndex;
+ BYTE ppemX;
+ BYTE ppemY;
+ BYTE bitDepth;
+ CHAR flags;
+
+public:
+ DEFINE_SIZE_STATIC(48);
+};
+
+
+/*
+ * Glyph Bitmap Data Formats.
+ */
+
+struct GlyphBitmapDataFormat17
+{
+ SmallGlyphMetrics glyphMetrics;
+ ULONG dataLen;
+ BYTE dataZ[VAR];
+
+ DEFINE_SIZE_ARRAY(9, dataZ);
+};
+
+
+/*
+ * CBLC -- Color Bitmap Location Table
+ */
+
+#define HB_OT_TAG_CBLC HB_TAG('C','B','L','C')
+
+struct CBLC
+{
+ static const hb_tag_t tableTag = HB_OT_TAG_CBLC;
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ likely (version.major == 2 || version.major == 3) &&
+ sizeTables.sanitize (c, this));
+ }
+
+ public:
+ const IndexSubtableRecord *find_table (hb_codepoint_t glyph,
+ unsigned int *x_ppem, unsigned int *y_ppem) const
+ {
+ /* TODO: Make it possible to select strike. */
+
+ unsigned int count = sizeTables.len;
+ for (uint32_t i = 0; i < count; ++i)
+ {
+ unsigned int startGlyphIndex = sizeTables.array[i].startGlyphIndex;
+ unsigned int endGlyphIndex = sizeTables.array[i].endGlyphIndex;
+ if (startGlyphIndex <= glyph && glyph <= endGlyphIndex)
+ {
+ *x_ppem = sizeTables[i].ppemX;
+ *y_ppem = sizeTables[i].ppemY;
+ return sizeTables[i].find_table (glyph, this);
+ }
+ }
+
+ return NULL;
+ }
+
+ protected:
+ FixedVersion<>version;
+ ArrayOf<BitmapSizeTable, ULONG> sizeTables;
+
+ public:
+ DEFINE_SIZE_ARRAY(8, sizeTables);
+};
+
+/*
+ * CBDT -- Color Bitmap Data Table
+ */
+#define HB_OT_TAG_CBDT HB_TAG('C','B','D','T')
+
+struct CBDT
+{
+ static const hb_tag_t tableTag = HB_OT_TAG_CBDT;
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) &&
+ likely (version.major == 2 || version.major == 3));
+ }
+
+ protected:
+ FixedVersion<>version;
+ BYTE dataZ[VAR];
+
+ public:
+ DEFINE_SIZE_ARRAY(4, dataZ);
+};
+
+} /* namespace OT */
+
+#endif /* HB_OT_CBDT_TABLE_HH */