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Minor. Better documentation. Adds TODOs for letter.

This commit is contained in:
Moazin Khatti 2019-06-15 13:14:51 +05:00
parent 4d59b8535e
commit 9a55001454
7 changed files with 82 additions and 31 deletions
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2
include/freetype/internal/cffotypes.h
View File

@ -61,6 +61,8 @@ FT_BEGIN_HEADER
{
FT_GlyphSlotRec root;
/* (OT-SVG) Added these here so that CFFGlyphSlot can be cast to
TT_GlyphSlot */
FT_Byte* svg_document;
FT_ULong svg_document_length;

21
include/freetype/internal/sfnt.h
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@ -312,7 +312,26 @@ FT_BEGIN_HEADER
TT_SBit_MetricsRec *ametrics );
/* OT-SVG to be documented later */
/**************************************************************************
*
* @functype:
* TT_Load_Svg_Doc_Func
*
* @description:
* Scans the SVG documents list to find the document containing the glyph
* that has the id `glyph<glyph_index>'
*
* @input:
* glyph ::
* The glyph slot from which pointers to SVG documents list will be
* grabbed. The results will be stored back in the slot too.
*
* glyph_index ::
* The index of the glyph that is to be looked up.
*
* @return:
* FreeType error code. 0 means success.
*/
typedef FT_Error
(*TT_Load_Svg_Doc_Func)( FT_GlyphSlot glyph,
FT_UInt glyph_index );

34
include/freetype/internal/tttypes.h
View File

@ -967,8 +967,8 @@ FT_BEGIN_HEADER
* This structure/class is defined here because it is common to the
* following formats: TTF, OpenType-TT, and OpenType-CFF.
*
* Note, however, that the classes TT_Size and `TT_GlyphSlot'(not anymore),
* are not shared between font drivers, and are thus defined in `ttobjs.h`.
* Note, however, that the class TT_Size is not shared between font driver,
* and is thus defined in `ttobjs.h`.
*
*/
@ -990,12 +990,28 @@ FT_BEGIN_HEADER
/**************************************************************************
*
* @Type:
* @type:
* TT_GlyphSlotRec_
*
* @Description:
* @description:
* A glyph slot that inherits from FT_GlyphSlotRec_ but adds more fields
*
* @fields:
* root ::
* Inherits this structure from FT_GlyphSlotRec. See note below.
*
* svg_document ::
* A pointer to the SVG Document stream under interest. The stream
* will be in plain text.
*
* svg_document_length ::
* The length of the `svg_document' stream.
*
* @note:
* This structure has been created to accomodate the needs of OT-SVG
* rendering. It inherits from FT_GlyphSlotRect. So that `TT_GlyphSlot'
* can be casted to `FT_GlyphSlot' and behave that way too. It's defined
* here because it is common to OpenType-TTF and OpenType-CFF.
*/
typedef struct TT_GlyphSlotRec_
{
@ -1004,14 +1020,8 @@ FT_BEGIN_HEADER
FT_ULong svg_document_length;
} TT_GlyphSlotRec;
/**************************************************************************
*
* @Type:
* TT_GlyphSlot
*
* @Description:
* A handle to a TrueType glyph slot object.
*/
/* A handle to a TrueType glyph slot object. */
typedef struct TT_GlyphSlotRec_* TT_GlyphSlot;

4
src/cff/cffgload.c
View File

@ -347,8 +347,8 @@
if ( load_flags & FT_LOAD_SBITS_ONLY )
return FT_THROW( Invalid_Argument );
/* OpenType SVG Support Over here */
if ( ( load_flags & FT_LOAD_COLOR ) &&
/* check for OT-SVG */
if ( ( load_flags & FT_LOAD_COLOR ) &&
( ((TT_Face)glyph->root.face)->svg ) )
{
SFNT_Service sfnt = (SFNT_Service)(((TT_Face)glyph->root.face)->sfnt);

2
src/sfnt/sfdriver.c
View File

@ -1299,7 +1299,7 @@
sfnt_get_name_id, /* TT_Get_Name_ID_Func get_name_id */
tt_face_load_svg, /* TT_Load_Table_Func load_svg */
tt_face_free_svg, /* TT_Free_Table_Func free_svg */
tt_face_load_svg_doc
tt_face_load_svg_doc /* TT_Load_Svg_Doc_Func load_svg_doc */
)

34
src/sfnt/ttsvg.c
View File

@ -32,6 +32,8 @@
#include "ttsvg.h"
/* TODO: (OT-SVG) Decide whether to add documentation here or not */
typedef struct Svg_
{
FT_UShort version; /* Table version (starting at 0) */
@ -131,15 +133,16 @@
FT_Bool found = FALSE;
FT_UInt i = 0;
/* For now it's linear search, later convert to binary search */
/* TODO: (OT-SVG) Convert to efficient search algorithm */
/* TODO: (OT-SVG) Use Frame Fields here instead of `FT_NEXT_*' */
for ( i = 0; i < num_entries; i++)
{
start_glyph_id = FT_NEXT_USHORT( stream );
end_glyph_id = FT_NEXT_USHORT( stream );
cur_doc_offset = FT_NEXT_ULONG( stream );
cur_doc_length = FT_NEXT_ULONG( stream );
if ( ( glyph_index >= start_glyph_id) &&
if ( ( glyph_index >= start_glyph_id) &&
( glyph_index <= end_glyph_id ) )
{
found = TRUE;
@ -162,9 +165,9 @@
TT_GlyphSlot glyph = (TT_GlyphSlot) glyph_;
/* TODO: properly clean stuff here on errors */
/* TODO: (OT-SVG) properly clean stuff here on errors */
FT_Byte* doc_list; /* Pointer to the Svg Document List */
FT_Byte* doc_list; /* Pointer to the Svg Document List */
FT_UShort num_entries; /* Total no of entires in doc list */
FT_ULong doc_offset;
@ -176,32 +179,39 @@
FT_Bool is_gzip_encoded = FALSE;
FT_Error error = FT_Err_Ok;
TT_Face face = (TT_Face)glyph->root.face;
TT_Face face = (TT_Face)glyph->root.face;
FT_Memory memory = face->root.memory;
Svg* svg = face->svg;
/* handle svg being 0x0 situation here */
doc_list = svg->svg_doc_list;
num_entries = FT_NEXT_USHORT( doc_list );
error = find_doc( doc_list, num_entries, glyph_index,
error = find_doc( doc_list, num_entries, glyph_index,
&doc_offset, &doc_length );
if ( error != FT_Err_Ok )
return error;
doc_list = svg->svg_doc_list; /* Reset to so we can use it again */
doc_list = (FT_Byte*)( doc_list + doc_offset );
if( ( doc_list[0] == 0x1F ) && ( doc_list[1] == 0x8B )
&& ( doc_list[2] == 0x08 ) )
{
is_gzip_encoded = TRUE;
/* get the size of the orignal document. This helps in alotting the
* buffer to accomodate the uncompressed version. The last 4 bytes
* of the compressed document are equal to orignal_size modulo 2^32.
* Since SVG docs will be lesser in size then 2^32, we can use this
* accurately. The four bytes are stored in little-endian format.
*/
uncomp_size = (FT_ULong)doc_list[doc_length - 1] << 24 |
(FT_ULong)doc_list[doc_length - 2] << 16 |
(FT_ULong)doc_list[doc_length - 3] << 8 |
(FT_ULong)doc_list[doc_length - 4];
/* TODO: memory allocated here needs to be freed somewhere */
/* TODO: (OT-SVG) memory allocated here needs to be freed somewhere */
uncomp_buffer = (FT_Byte*) memory->alloc(memory, uncomp_size);
error = FT_Gzip_Uncompress( memory, uncomp_buffer, &uncomp_size,
doc_list, doc_length );
@ -214,11 +224,9 @@
glyph->svg_document = uncomp_buffer;
glyph->svg_document_length = uncomp_size;
return FT_Err_Ok;
}
}
glyph->svg_document = doc_list;
glyph->svg_document_length = doc_length;
return FT_Err_Ok;
}

16
src/truetype/ttgload.c
View File

@ -2219,6 +2219,10 @@
FT_BBox bbox;
FT_Fixed y_scale;
/* TODO: (OT-SVG) Temporary hack to accomodate the change
* in the `TT_GlyphSlot' made. Rewrite properly
*/
TT_GlyphSlot glyph_ = (TT_GlyphSlot)loader->glyph;
FT_GlyphSlot glyph = (FT_GlyphSlot)glyph_;
TT_Size size = loader->size;
@ -2407,7 +2411,9 @@
FT_Error error;
TT_SBit_MetricsRec sbit_metrics;
/* (OT-SVG) face assignment changed to accomodate the change in
* the structure of TT_GlyphSlot
*/
face = (TT_Face)(glyph->root.face);
sfnt = (SFNT_Service)face->sfnt;
stream = face->root.stream;
@ -2419,6 +2425,10 @@
stream,
&(glyph->root.bitmap),
&sbit_metrics );
/* TODO: (OT-SVG) So many `glyph->root' look ugly. Maybe create a new variable
* to make this look good.
*/
if ( !error )
{
(glyph->root).outline.n_points = 0;
@ -2797,6 +2807,8 @@
FT_Error error;
TT_LoaderRec loader;
SFNT_Service sfnt;
/* TODO: (OT-SVG) maybe find a proper way to do this */
FT_GlyphSlot glyph = (FT_GlyphSlot)glyph_;
FT_TRACE1(( "TT_Load_Glyph: glyph index %d\n", glyph_index ));
@ -2901,7 +2913,7 @@
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
/* OT-SVG part here */
/* check for OT-SVG */
if ( ( load_flags & FT_LOAD_COLOR ) && ( ((TT_Face)glyph->face)->svg ) )
{
sfnt = (SFNT_Service)((TT_Face)glyph->face)->sfnt;