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Add function `FT_Get_GlyphLayers' to access `COLR' table data. 

* include/freetype/internal/ftobjs.h (FT_Glyph_LayerRec): Move this
structure to...
* include/freetype/freetype.h (FT_Glyph_LayerRec): ... this
header file.
(FT_Glyph_Layer): New typedef.
Update code to use it where appropriate.

* src/base/ftobjs.c (FT_Get_GlyphLayers): New function.
This commit is contained in:
Werner Lemberg 2018-05-16 20:37:43 +02:00
parent f1458d2e44
commit 583dabf291
8 changed files with 158 additions and 33 deletions
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13
ChangeLog
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@ -1,3 +1,16 @@
2018-05-16 Werner Lemberg <wl@gnu.org>
Add function `FT_Get_GlyphLayers' to access `COLR' table data.
* include/freetype/internal/ftobjs.h (FT_Glyph_LayerRec): Move this
structure to...
* include/freetype/freetype.h (FT_Glyph_LayerRec): ... this
header file.
(FT_Glyph_Layer): New typedef.
Update code to use it where appropriate.
* src/base/ftobjs.c (FT_Get_GlyphLayers): New function.
2018-05-15 Alexei Podtelezhnikov <apodtele@gmail.com>
[base] Fix mono bitmap presetting (#53896).

95
include/freetype/freetype.h
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@ -3986,6 +3986,101 @@ FT_BEGIN_HEADER
FT_Matrix *p_transform );
/**********************************************************************
*
* @type:
* FT_Glyph_Layer
*
* @description:
* A handle to an @FT_Glyph_LayerRec structure to model a given
* colored glyph layer.
*/
typedef struct FT_Glyph_LayerRec_* FT_Glyph_Layer;
/**********************************************************************
*
* @struct:
* FT_Glyph_LayerRec
*
* @description:
* This structure models a given colored glyph layer as defined in the
* OpenType `COLR' table. It is used by @FT_Get_GlyphLayers.
*
* @fields:
* glyph_index ::
* The glyph index of the current glyph layer.
*
* color_index ::
* The color index into the font face's color palette, which can be
* retrieved with @FT_Palette_Select. The value 0xFFFF is special; it
* doesn't reference a palette entry but indicates that the text
* foreground color should be used instead (to be set up by the
* application outside of FreeType).
*/
typedef struct FT_Glyph_LayerRec_
{
FT_UShort glyph_index;
FT_UShort color_index;
} FT_Glyph_LayerRec;
/*************************************************************************
*
* @func:
* FT_Get_GlyphLayers
*
* @description:
* This is an interface to the `COLR' table in OpenType fonts to
* retrieve the colored glyph layers array associated with the current
* glyph slot.
*
* https://docs.microsoft.com/en-us/typography/opentype/spec/colr
*
* The glyph layer data for a given glyph slot, if present, provides an
* alternative, multi-colour glyph representation: Instead of rendering
* the outline or bitmap in the glyph slot, glyphs with the indices and
* colors returned in the @FT_GlyphLayer array are rendered layer by
* layer.
*
* @input:
* glyph ::
* The source glyph slot.
*
* @output:
* anum_layers ::
* The number of colored glyph layers for `glyph'.
*
* alayers ::
* An @FT_GlyphLayer array with `anum_layers' elements. NULL if there
* aren't glyph layers.
*
* The elements are ordered in the z~direction from bottom to top; an
* element `n' should be rendered with the associated palette color
* and blended on top of the already rendered layers (elements 0, 1,
* ..., n-1).
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* The data in `alayers' is owned and managed by the glyph slot.
*
* This function is necessary if you want to handle glyph layers by
* yourself. In particular, functions that operate with @FT_GlyphRec
* objects (like @FT_Get_Glyph or @FT_Glyph_To_Bitmap) don't have access
* to this information.
*
* @FT_Render_Glyph, however, handles colored glyph layers
* automatically.
*/
FT_EXPORT( FT_Error )
FT_Get_GlyphLayers( FT_GlyphSlot glyph,
FT_UShort *anum_layers,
FT_Glyph_Layer *alayers );
/*************************************************************************/
/* */
/* <Enum> */

14
include/freetype/internal/ftobjs.h
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@ -384,19 +384,11 @@ FT_BEGIN_HEADER
} FT_Face_InternalRec;
typedef struct FT_Glyph_LayerRec_
{
FT_UShort glyph_index;
FT_UShort color_index;
} FT_Glyph_LayerRec;
typedef struct FT_Colr_InternalRec_
{
FT_Glyph_LayerRec* layers;
FT_UShort num_layers;
FT_Int load_flags;
FT_Glyph_Layer layers;
FT_UShort num_layers;
FT_Int load_flags;
} FT_Colr_InternalRec, *FT_Colr_Internal;

8
include/freetype/internal/sfnt.h
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@ -452,10 +452,10 @@ FT_BEGIN_HEADER
/* color layer information exists for `idx'. */
/* */
typedef FT_Error
(*TT_Load_Colr_Layer_Func)( TT_Face face,
FT_Int idx,
FT_Glyph_LayerRec* *layers,
FT_UShort* num_layers );
(*TT_Load_Colr_Layer_Func)( TT_Face face,
FT_Int idx,
FT_Glyph_Layer *layers,
FT_UShort* num_layers );
/*************************************************************************/

29
src/base/ftobjs.c
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@ -4531,8 +4531,8 @@
TT_Face ttface = (TT_Face)face;
SFNT_Service sfnt = (SFNT_Service)ttface->sfnt;
FT_Glyph_LayerRec* glyph_layers =
slot->internal->color_layers->layers;
FT_Glyph_Layer glyph_layers =
slot->internal->color_layers->layers;
FT_Int idx;
@ -5461,4 +5461,29 @@
}
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Error )
FT_Get_GlyphLayers( FT_GlyphSlot glyph,
FT_UShort *anum_layers,
FT_Glyph_Layer *alayers )
{
if ( !glyph )
return FT_THROW( Invalid_Argument );
if ( glyph->internal->color_layers )
{
*anum_layers = glyph->internal->color_layers->num_layers;
*alayers = glyph->internal->color_layers->layers;
}
else
{
*anum_layers = 0;
*alayers = NULL;
}
return FT_Err_Ok;
}
/* END */

16
src/sfnt/ttcolr.c
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@ -290,10 +290,10 @@
FT_LOCAL_DEF( FT_Error )
tt_face_load_colr_layers( TT_Face face,
FT_Int glyph_id,
FT_Glyph_LayerRec* *ret_layers,
FT_UShort* ret_num_layers )
tt_face_load_colr_layers( TT_Face face,
FT_Int glyph_id,
FT_Glyph_Layer *ret_layers,
FT_UShort* ret_num_layers )
{
FT_Error error;
FT_Memory memory = face->root.memory;
@ -302,10 +302,10 @@
Colr* colr = &colr_and_cpal->colr;
Cpal* cpal = &colr_and_cpal->cpal;
BaseGlyphRecord glyph_record;
FT_Glyph_LayerRec* layers;
int layer_idx;
FT_Byte* layer_record_ptr;
BaseGlyphRecord glyph_record;
FT_Glyph_Layer layers;
int layer_idx;
FT_Byte* layer_record_ptr;
if ( !ret_layers || !ret_num_layers )

8
src/sfnt/ttcolr.h
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@ -37,10 +37,10 @@ FT_BEGIN_HEADER
tt_face_free_colr( TT_Face face );
FT_LOCAL( FT_Error )
tt_face_load_colr_layers( TT_Face face,
FT_Int glyph_id,
FT_Glyph_LayerRec* *ret_layers,
FT_UShort* ret_num_layers );
tt_face_load_colr_layers( TT_Face face,
FT_Int glyph_id,
FT_Glyph_Layer *ret_layers,
FT_UShort* ret_num_layers );
FT_LOCAL( FT_Error )
tt_face_colr_blend_layer( TT_Face face,

8
src/truetype/ttgload.c
View File

@ -2894,15 +2894,15 @@
/* The outline based algorithm took care of metrics. */
/* Read additional color info if requested. */
if ( ( load_flags & FT_LOAD_COLOR ) &&
( (TT_Face)(glyph->face) )->colr_and_cpal )
if ( ( load_flags & FT_LOAD_COLOR ) &&
( (TT_Face)glyph->face )->colr_and_cpal )
{
TT_Face face = (TT_Face)glyph->face;
FT_Memory memory = face->root.memory;
SFNT_Service sfnt = (SFNT_Service)face->sfnt;
FT_Glyph_LayerRec* glyph_layers;
FT_UShort num_glyph_layers;
FT_Glyph_Layer glyph_layers;
FT_UShort num_glyph_layers;
error = sfnt->load_colr_layer( face,