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expose font-table APIs to SkTypeface

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Review URL: https://codereview.appspot.com/6050046

git-svn-id: http://skia.googlecode.com/svn/trunk@3707 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@google.com 2012-04-17 18:01:31 +00:00
parent f3488ebaac
commit f11508d7f4
3 changed files with 62 additions and 3 deletions
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2
include/core/SkFontHost.h
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@ -17,8 +17,6 @@ class SkDescriptor;
class SkStream;
class SkWStream;
typedef uint32_t SkFontTableTag;
/** \class SkFontHost
This class is ported to each environment. It is responsible for bridging

43
include/core/SkTypeface.h
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@ -18,6 +18,7 @@ class SkAdvancedTypefaceMetrics;
class SkWStream;
typedef uint32_t SkFontID;
typedef uint32_t SkFontTableTag;
/** \class SkTypeface
@ -61,7 +62,7 @@ public:
data. Will never return 0.
*/
SkFontID uniqueID() const { return fUniqueID; }
/** Return the uniqueID for the specified typeface. If the face is null,
resolve it to the default font and return its uniqueID. Will never
return 0.
@ -146,6 +147,46 @@ public:
const uint32_t* glyphIDs = NULL,
uint32_t glyphIDsCount = 0) const;
// Table getters -- may fail if the underlying font format is not organized
// as 4-byte tables.
/** Return the number of tables in the font. */
int countTables() const;
/** Copy into tags[] (allocated by the caller) the list of table tags in
* the font, and return the number. This will be the same as CountTables()
* or 0 if an error occured. If tags == NULL, this only returns the count
* (the same as calling countTables()).
*/
int getTableTags(SkFontTableTag tags[]) const;
/** Given a table tag, return the size of its contents, or 0 if not present
*/
size_t getTableSize(SkFontTableTag) const;
/** Copy the contents of a table into data (allocated by the caller). Note
* that the contents of the table will be in their native endian order
* (which for most truetype tables is big endian). If the table tag is
* not found, or there is an error copying the data, then 0 is returned.
* If this happens, it is possible that some or all of the memory pointed
* to by data may have been written to, even though an error has occured.
*
* @param fontID the font to copy the table from
* @param tag The table tag whose contents are to be copied
* @param offset The offset in bytes into the table's contents where the
* copy should start from.
* @param length The number of bytes, starting at offset, of table data
* to copy.
* @param data storage address where the table contents are copied to
* @return the number of bytes actually copied into data. If offset+length
* exceeds the table's size, then only the bytes up to the table's
* size are actually copied, and this is the value returned. If
* offset > the table's size, or tag is not a valid table,
* then 0 is returned.
*/
size_t getTableData(SkFontTableTag tag, size_t offset, size_t length,
void* data) const;
protected:
/** uniqueID must be unique (please!) and non-zero
*/

20
src/core/SkTypeface.cpp
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@ -101,3 +101,23 @@ SkAdvancedTypefaceMetrics* SkTypeface::getAdvancedTypefaceMetrics(
glyphIDs,
glyphIDsCount);
}
///////////////////////////////////////////////////////////////////////////////
int SkTypeface::countTables() const {
return SkFontHost::CountTables(fUniqueID);
}
int SkTypeface::getTableTags(SkFontTableTag tags[]) const {
return SkFontHost::GetTableTags(fUniqueID, tags);
}
size_t SkTypeface::getTableSize(SkFontTableTag tag) const {
return SkFontHost::GetTableSize(fUniqueID, tag);
}
size_t SkTypeface::getTableData(SkFontTableTag tag, size_t offset, size_t length,
void* data) const {
return SkFontHost::GetTableData(fUniqueID, tag, offset, length, data);
}