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Unified Diff: third_party/freetype2/src/src/pfr/pfrgload.c

Issue 1524973002: Update freetype sources (2.6.2) in third party. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 5 years ago
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Index: third_party/freetype2/src/src/pfr/pfrgload.c
diff --git a/third_party/freetype2/src/src/pfr/pfrgload.c b/third_party/freetype2/src/src/pfr/pfrgload.c
new file mode 100644
index 0000000000000000000000000000000000000000..e07c21a0e160c1869b5f38dad02ac547151a2f34
--- /dev/null
+++ b/third_party/freetype2/src/src/pfr/pfrgload.c
@@ -0,0 +1,847 @@
+/***************************************************************************/
+/* */
+/* pfrgload.c */
+/* */
+/* FreeType PFR glyph loader (body). */
+/* */
+/* Copyright 2002-2015 by */
+/* David Turner, Robert Wilhelm, and Werner Lemberg. */
+/* */
+/* This file is part of the FreeType project, and may only be used, */
+/* modified, and distributed under the terms of the FreeType project */
+/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/***************************************************************************/
+
+
+#include "pfrgload.h"
+#include "pfrsbit.h"
+#include "pfrload.h" /* for macro definitions */
+#include FT_INTERNAL_DEBUG_H
+
+#include "pfrerror.h"
+
+#undef FT_COMPONENT
+#define FT_COMPONENT trace_pfr
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** PFR GLYPH BUILDER *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ FT_LOCAL_DEF( void )
+ pfr_glyph_init( PFR_Glyph glyph,
+ FT_GlyphLoader loader )
+ {
+ FT_ZERO( glyph );
+
+ glyph->loader = loader;
+ glyph->path_begun = 0;
+
+ FT_GlyphLoader_Rewind( loader );
+ }
+
+
+ FT_LOCAL_DEF( void )
+ pfr_glyph_done( PFR_Glyph glyph )
+ {
+ FT_Memory memory = glyph->loader->memory;
+
+
+ FT_FREE( glyph->x_control );
+ glyph->y_control = NULL;
+
+ glyph->max_xy_control = 0;
+#if 0
+ glyph->num_x_control = 0;
+ glyph->num_y_control = 0;
+#endif
+
+ FT_FREE( glyph->subs );
+
+ glyph->max_subs = 0;
+ glyph->num_subs = 0;
+
+ glyph->loader = NULL;
+ glyph->path_begun = 0;
+ }
+
+
+ /* close current contour, if any */
+ static void
+ pfr_glyph_close_contour( PFR_Glyph glyph )
+ {
+ FT_GlyphLoader loader = glyph->loader;
+ FT_Outline* outline = &loader->current.outline;
+ FT_Int last, first;
+
+
+ if ( !glyph->path_begun )
+ return;
+
+ /* compute first and last point indices in current glyph outline */
+ last = outline->n_points - 1;
+ first = 0;
+ if ( outline->n_contours > 0 )
+ first = outline->contours[outline->n_contours - 1];
+
+ /* if the last point falls on the same location as the first one */
+ /* we need to delete it */
+ if ( last > first )
+ {
+ FT_Vector* p1 = outline->points + first;
+ FT_Vector* p2 = outline->points + last;
+
+
+ if ( p1->x == p2->x && p1->y == p2->y )
+ {
+ outline->n_points--;
+ last--;
+ }
+ }
+
+ /* don't add empty contours */
+ if ( last >= first )
+ outline->contours[outline->n_contours++] = (short)last;
+
+ glyph->path_begun = 0;
+ }
+
+
+ /* reset glyph to start the loading of a new glyph */
+ static void
+ pfr_glyph_start( PFR_Glyph glyph )
+ {
+ glyph->path_begun = 0;
+ }
+
+
+ static FT_Error
+ pfr_glyph_line_to( PFR_Glyph glyph,
+ FT_Vector* to )
+ {
+ FT_GlyphLoader loader = glyph->loader;
+ FT_Outline* outline = &loader->current.outline;
+ FT_Error error;
+
+
+ /* check that we have begun a new path */
+ if ( !glyph->path_begun )
+ {
+ error = FT_THROW( Invalid_Table );
+ FT_ERROR(( "pfr_glyph_line_to: invalid glyph data\n" ));
+ goto Exit;
+ }
+
+ error = FT_GLYPHLOADER_CHECK_POINTS( loader, 1, 0 );
+ if ( !error )
+ {
+ FT_Int n = outline->n_points;
+
+
+ outline->points[n] = *to;
+ outline->tags [n] = FT_CURVE_TAG_ON;
+
+ outline->n_points++;
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ static FT_Error
+ pfr_glyph_curve_to( PFR_Glyph glyph,
+ FT_Vector* control1,
+ FT_Vector* control2,
+ FT_Vector* to )
+ {
+ FT_GlyphLoader loader = glyph->loader;
+ FT_Outline* outline = &loader->current.outline;
+ FT_Error error;
+
+
+ /* check that we have begun a new path */
+ if ( !glyph->path_begun )
+ {
+ error = FT_THROW( Invalid_Table );
+ FT_ERROR(( "pfr_glyph_line_to: invalid glyph data\n" ));
+ goto Exit;
+ }
+
+ error = FT_GLYPHLOADER_CHECK_POINTS( loader, 3, 0 );
+ if ( !error )
+ {
+ FT_Vector* vec = outline->points + outline->n_points;
+ FT_Byte* tag = (FT_Byte*)outline->tags + outline->n_points;
+
+
+ vec[0] = *control1;
+ vec[1] = *control2;
+ vec[2] = *to;
+ tag[0] = FT_CURVE_TAG_CUBIC;
+ tag[1] = FT_CURVE_TAG_CUBIC;
+ tag[2] = FT_CURVE_TAG_ON;
+
+ outline->n_points = (FT_Short)( outline->n_points + 3 );
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ static FT_Error
+ pfr_glyph_move_to( PFR_Glyph glyph,
+ FT_Vector* to )
+ {
+ FT_GlyphLoader loader = glyph->loader;
+ FT_Error error;
+
+
+ /* close current contour if any */
+ pfr_glyph_close_contour( glyph );
+
+ /* indicate that a new contour has started */
+ glyph->path_begun = 1;
+
+ /* check that there is space for a new contour and a new point */
+ error = FT_GLYPHLOADER_CHECK_POINTS( loader, 1, 1 );
+ if ( !error )
+ {
+ /* add new start point */
+ error = pfr_glyph_line_to( glyph, to );
+ }
+
+ return error;
+ }
+
+
+ static void
+ pfr_glyph_end( PFR_Glyph glyph )
+ {
+ /* close current contour if any */
+ pfr_glyph_close_contour( glyph );
+
+ /* merge the current glyph into the stack */
+ FT_GlyphLoader_Add( glyph->loader );
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** PFR GLYPH LOADER *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /* load a simple glyph */
+ static FT_Error
+ pfr_glyph_load_simple( PFR_Glyph glyph,
+ FT_Byte* p,
+ FT_Byte* limit )
+ {
+ FT_Error error = FT_Err_Ok;
+ FT_Memory memory = glyph->loader->memory;
+ FT_UInt flags, x_count, y_count, i, count, mask;
+ FT_Int x;
+
+
+ PFR_CHECK( 1 );
+ flags = PFR_NEXT_BYTE( p );
+
+ /* test for composite glyphs */
+ if ( flags & PFR_GLYPH_IS_COMPOUND )
+ goto Failure;
+
+ x_count = 0;
+ y_count = 0;
+
+ if ( flags & PFR_GLYPH_1BYTE_XYCOUNT )
+ {
+ PFR_CHECK( 1 );
+ count = PFR_NEXT_BYTE( p );
+ x_count = count & 15;
+ y_count = count >> 4;
+ }
+ else
+ {
+ if ( flags & PFR_GLYPH_XCOUNT )
+ {
+ PFR_CHECK( 1 );
+ x_count = PFR_NEXT_BYTE( p );
+ }
+
+ if ( flags & PFR_GLYPH_YCOUNT )
+ {
+ PFR_CHECK( 1 );
+ y_count = PFR_NEXT_BYTE( p );
+ }
+ }
+
+ count = x_count + y_count;
+
+ /* re-allocate array when necessary */
+ if ( count > glyph->max_xy_control )
+ {
+ FT_UInt new_max = FT_PAD_CEIL( count, 8 );
+
+
+ if ( FT_RENEW_ARRAY( glyph->x_control,
+ glyph->max_xy_control,
+ new_max ) )
+ goto Exit;
+
+ glyph->max_xy_control = new_max;
+ }
+
+ glyph->y_control = glyph->x_control + x_count;
+
+ mask = 0;
+ x = 0;
+
+ for ( i = 0; i < count; i++ )
+ {
+ if ( ( i & 7 ) == 0 )
+ {
+ PFR_CHECK( 1 );
+ mask = PFR_NEXT_BYTE( p );
+ }
+
+ if ( mask & 1 )
+ {
+ PFR_CHECK( 2 );
+ x = PFR_NEXT_SHORT( p );
+ }
+ else
+ {
+ PFR_CHECK( 1 );
+ x += PFR_NEXT_BYTE( p );
+ }
+
+ glyph->x_control[i] = x;
+
+ mask >>= 1;
+ }
+
+ /* XXX: we ignore the secondary stroke and edge definitions */
+ /* since we don't support native PFR hinting */
+ /* */
+ if ( flags & PFR_GLYPH_EXTRA_ITEMS )
+ {
+ error = pfr_extra_items_skip( &p, limit );
+ if ( error )
+ goto Exit;
+ }
+
+ pfr_glyph_start( glyph );
+
+ /* now load a simple glyph */
+ {
+ FT_Vector pos[4];
+ FT_Vector* cur;
+
+
+ pos[0].x = pos[0].y = 0;
+ pos[3] = pos[0];
+
+ for (;;)
+ {
+ FT_UInt format, format_low, args_format = 0, args_count, n;
+
+
+ /***************************************************************/
+ /* read instruction */
+ /* */
+ PFR_CHECK( 1 );
+ format = PFR_NEXT_BYTE( p );
+ format_low = format & 15;
+
+ switch ( format >> 4 )
+ {
+ case 0: /* end glyph */
+ FT_TRACE6(( "- end glyph" ));
+ args_count = 0;
+ break;
+
+ case 1: /* general line operation */
+ FT_TRACE6(( "- general line" ));
+ goto Line1;
+
+ case 4: /* move to inside contour */
+ FT_TRACE6(( "- move to inside" ));
+ goto Line1;
+
+ case 5: /* move to outside contour */
+ FT_TRACE6(( "- move to outside" ));
+ Line1:
+ args_format = format_low;
+ args_count = 1;
+ break;
+
+ case 2: /* horizontal line to */
+ FT_TRACE6(( "- horizontal line to cx.%d", format_low ));
+ if ( format_low >= x_count )
+ goto Failure;
+ pos[0].x = glyph->x_control[format_low];
+ pos[0].y = pos[3].y;
+ pos[3] = pos[0];
+ args_count = 0;
+ break;
+
+ case 3: /* vertical line to */
+ FT_TRACE6(( "- vertical line to cy.%d", format_low ));
+ if ( format_low >= y_count )
+ goto Failure;
+ pos[0].x = pos[3].x;
+ pos[0].y = glyph->y_control[format_low];
+ pos[3] = pos[0];
+ args_count = 0;
+ break;
+
+ case 6: /* horizontal to vertical curve */
+ FT_TRACE6(( "- hv curve " ));
+ args_format = 0xB8E;
+ args_count = 3;
+ break;
+
+ case 7: /* vertical to horizontal curve */
+ FT_TRACE6(( "- vh curve" ));
+ args_format = 0xE2B;
+ args_count = 3;
+ break;
+
+ default: /* general curve to */
+ FT_TRACE6(( "- general curve" ));
+ args_count = 4;
+ args_format = format_low;
+ }
+
+ /***********************************************************/
+ /* now read arguments */
+ /* */
+ cur = pos;
+ for ( n = 0; n < args_count; n++ )
+ {
+ FT_UInt idx;
+ FT_Int delta;
+
+
+ /* read the X argument */
+ switch ( args_format & 3 )
+ {
+ case 0: /* 8-bit index */
+ PFR_CHECK( 1 );
+ idx = PFR_NEXT_BYTE( p );
+ if ( idx >= x_count )
+ goto Failure;
+ cur->x = glyph->x_control[idx];
+ FT_TRACE7(( " cx#%d", idx ));
+ break;
+
+ case 1: /* 16-bit absolute value */
+ PFR_CHECK( 2 );
+ cur->x = PFR_NEXT_SHORT( p );
+ FT_TRACE7(( " x.%d", cur->x ));
+ break;
+
+ case 2: /* 8-bit delta */
+ PFR_CHECK( 1 );
+ delta = PFR_NEXT_INT8( p );
+ cur->x = pos[3].x + delta;
+ FT_TRACE7(( " dx.%d", delta ));
+ break;
+
+ default:
+ FT_TRACE7(( " |" ));
+ cur->x = pos[3].x;
+ }
+
+ /* read the Y argument */
+ switch ( ( args_format >> 2 ) & 3 )
+ {
+ case 0: /* 8-bit index */
+ PFR_CHECK( 1 );
+ idx = PFR_NEXT_BYTE( p );
+ if ( idx >= y_count )
+ goto Failure;
+ cur->y = glyph->y_control[idx];
+ FT_TRACE7(( " cy#%d", idx ));
+ break;
+
+ case 1: /* 16-bit absolute value */
+ PFR_CHECK( 2 );
+ cur->y = PFR_NEXT_SHORT( p );
+ FT_TRACE7(( " y.%d", cur->y ));
+ break;
+
+ case 2: /* 8-bit delta */
+ PFR_CHECK( 1 );
+ delta = PFR_NEXT_INT8( p );
+ cur->y = pos[3].y + delta;
+ FT_TRACE7(( " dy.%d", delta ));
+ break;
+
+ default:
+ FT_TRACE7(( " -" ));
+ cur->y = pos[3].y;
+ }
+
+ /* read the additional format flag for the general curve */
+ if ( n == 0 && args_count == 4 )
+ {
+ PFR_CHECK( 1 );
+ args_format = PFR_NEXT_BYTE( p );
+ args_count--;
+ }
+ else
+ args_format >>= 4;
+
+ /* save the previous point */
+ pos[3] = cur[0];
+ cur++;
+ }
+
+ FT_TRACE7(( "\n" ));
+
+ /***********************************************************/
+ /* finally, execute instruction */
+ /* */
+ switch ( format >> 4 )
+ {
+ case 0: /* end glyph => EXIT */
+ pfr_glyph_end( glyph );
+ goto Exit;
+
+ case 1: /* line operations */
+ case 2:
+ case 3:
+ error = pfr_glyph_line_to( glyph, pos );
+ goto Test_Error;
+
+ case 4: /* move to inside contour */
+ case 5: /* move to outside contour */
+ error = pfr_glyph_move_to( glyph, pos );
+ goto Test_Error;
+
+ default: /* curve operations */
+ error = pfr_glyph_curve_to( glyph, pos, pos + 1, pos + 2 );
+
+ Test_Error: /* test error condition */
+ if ( error )
+ goto Exit;
+ }
+ } /* for (;;) */
+ }
+
+ Exit:
+ return error;
+
+ Failure:
+ Too_Short:
+ error = FT_THROW( Invalid_Table );
+ FT_ERROR(( "pfr_glyph_load_simple: invalid glyph data\n" ));
+ goto Exit;
+ }
+
+
+ /* load a composite/compound glyph */
+ static FT_Error
+ pfr_glyph_load_compound( PFR_Glyph glyph,
+ FT_Byte* p,
+ FT_Byte* limit )
+ {
+ FT_Error error = FT_Err_Ok;
+ FT_GlyphLoader loader = glyph->loader;
+ FT_Memory memory = loader->memory;
+ PFR_SubGlyph subglyph;
+ FT_UInt flags, i, count, org_count;
+ FT_Int x_pos, y_pos;
+
+
+ PFR_CHECK( 1 );
+ flags = PFR_NEXT_BYTE( p );
+
+ /* test for composite glyphs */
+ if ( !( flags & PFR_GLYPH_IS_COMPOUND ) )
+ goto Failure;
+
+ count = flags & 0x3F;
+
+ /* ignore extra items when present */
+ /* */
+ if ( flags & PFR_GLYPH_EXTRA_ITEMS )
+ {
+ error = pfr_extra_items_skip( &p, limit );
+ if ( error )
+ goto Exit;
+ }
+
+ /* we can't rely on the FT_GlyphLoader to load sub-glyphs, because */
+ /* the PFR format is dumb, using direct file offsets to point to the */
+ /* sub-glyphs (instead of glyph indices). Sigh. */
+ /* */
+ /* For now, we load the list of sub-glyphs into a different array */
+ /* but this will prevent us from using the auto-hinter at its best */
+ /* quality. */
+ /* */
+ org_count = glyph->num_subs;
+
+ if ( org_count + count > glyph->max_subs )
+ {
+ FT_UInt new_max = ( org_count + count + 3 ) & (FT_UInt)-4;
+
+
+ /* we arbitrarily limit the number of subglyphs */
+ /* to avoid endless recursion */
+ if ( new_max > 64 )
+ {
+ error = FT_THROW( Invalid_Table );
+ FT_ERROR(( "pfr_glyph_load_compound:"
+ " too many compound glyphs components\n" ));
+ goto Exit;
+ }
+
+ if ( FT_RENEW_ARRAY( glyph->subs, glyph->max_subs, new_max ) )
+ goto Exit;
+
+ glyph->max_subs = new_max;
+ }
+
+ subglyph = glyph->subs + org_count;
+
+ for ( i = 0; i < count; i++, subglyph++ )
+ {
+ FT_UInt format;
+
+
+ x_pos = 0;
+ y_pos = 0;
+
+ PFR_CHECK( 1 );
+ format = PFR_NEXT_BYTE( p );
+
+ /* read scale when available */
+ subglyph->x_scale = 0x10000L;
+ if ( format & PFR_SUBGLYPH_XSCALE )
+ {
+ PFR_CHECK( 2 );
+ subglyph->x_scale = PFR_NEXT_SHORT( p ) * 16;
+ }
+
+ subglyph->y_scale = 0x10000L;
+ if ( format & PFR_SUBGLYPH_YSCALE )
+ {
+ PFR_CHECK( 2 );
+ subglyph->y_scale = PFR_NEXT_SHORT( p ) * 16;
+ }
+
+ /* read offset */
+ switch ( format & 3 )
+ {
+ case 1:
+ PFR_CHECK( 2 );
+ x_pos = PFR_NEXT_SHORT( p );
+ break;
+
+ case 2:
+ PFR_CHECK( 1 );
+ x_pos += PFR_NEXT_INT8( p );
+ break;
+
+ default:
+ ;
+ }
+
+ switch ( ( format >> 2 ) & 3 )
+ {
+ case 1:
+ PFR_CHECK( 2 );
+ y_pos = PFR_NEXT_SHORT( p );
+ break;
+
+ case 2:
+ PFR_CHECK( 1 );
+ y_pos += PFR_NEXT_INT8( p );
+ break;
+
+ default:
+ ;
+ }
+
+ subglyph->x_delta = x_pos;
+ subglyph->y_delta = y_pos;
+
+ /* read glyph position and size now */
+ if ( format & PFR_SUBGLYPH_2BYTE_SIZE )
+ {
+ PFR_CHECK( 2 );
+ subglyph->gps_size = PFR_NEXT_USHORT( p );
+ }
+ else
+ {
+ PFR_CHECK( 1 );
+ subglyph->gps_size = PFR_NEXT_BYTE( p );
+ }
+
+ if ( format & PFR_SUBGLYPH_3BYTE_OFFSET )
+ {
+ PFR_CHECK( 3 );
+ subglyph->gps_offset = PFR_NEXT_ULONG( p );
+ }
+ else
+ {
+ PFR_CHECK( 2 );
+ subglyph->gps_offset = PFR_NEXT_USHORT( p );
+ }
+
+ glyph->num_subs++;
+ }
+
+ Exit:
+ return error;
+
+ Failure:
+ Too_Short:
+ error = FT_THROW( Invalid_Table );
+ FT_ERROR(( "pfr_glyph_load_compound: invalid glyph data\n" ));
+ goto Exit;
+ }
+
+
+ static FT_Error
+ pfr_glyph_load_rec( PFR_Glyph glyph,
+ FT_Stream stream,
+ FT_ULong gps_offset,
+ FT_ULong offset,
+ FT_ULong size )
+ {
+ FT_Error error;
+ FT_Byte* p;
+ FT_Byte* limit;
+
+
+ if ( FT_STREAM_SEEK( gps_offset + offset ) ||
+ FT_FRAME_ENTER( size ) )
+ goto Exit;
+
+ p = (FT_Byte*)stream->cursor;
+ limit = p + size;
+
+ if ( size > 0 && *p & PFR_GLYPH_IS_COMPOUND )
+ {
+ FT_UInt n, old_count, count;
+ FT_GlyphLoader loader = glyph->loader;
+ FT_Outline* base = &loader->base.outline;
+
+
+ old_count = glyph->num_subs;
+
+ /* this is a compound glyph - load it */
+ error = pfr_glyph_load_compound( glyph, p, limit );
+
+ FT_FRAME_EXIT();
+
+ if ( error )
+ goto Exit;
+
+ count = glyph->num_subs - old_count;
+
+ FT_TRACE4(( "compound glyph with %d elements (offset %lu):\n",
+ count, offset ));
+
+ /* now, load each individual glyph */
+ for ( n = 0; n < count; n++ )
+ {
+ FT_Int i, old_points, num_points;
+ PFR_SubGlyph subglyph;
+
+
+ FT_TRACE4(( " subglyph %d:\n", n ));
+
+ subglyph = glyph->subs + old_count + n;
+ old_points = base->n_points;
+
+ error = pfr_glyph_load_rec( glyph, stream, gps_offset,
+ subglyph->gps_offset,
+ subglyph->gps_size );
+ if ( error )
+ break;
+
+ /* note that `glyph->subs' might have been re-allocated */
+ subglyph = glyph->subs + old_count + n;
+ num_points = base->n_points - old_points;
+
+ /* translate and eventually scale the new glyph points */
+ if ( subglyph->x_scale != 0x10000L || subglyph->y_scale != 0x10000L )
+ {
+ FT_Vector* vec = base->points + old_points;
+
+
+ for ( i = 0; i < num_points; i++, vec++ )
+ {
+ vec->x = FT_MulFix( vec->x, subglyph->x_scale ) +
+ subglyph->x_delta;
+ vec->y = FT_MulFix( vec->y, subglyph->y_scale ) +
+ subglyph->y_delta;
+ }
+ }
+ else
+ {
+ FT_Vector* vec = loader->base.outline.points + old_points;
+
+
+ for ( i = 0; i < num_points; i++, vec++ )
+ {
+ vec->x += subglyph->x_delta;
+ vec->y += subglyph->y_delta;
+ }
+ }
+
+ /* proceed to next sub-glyph */
+ }
+
+ FT_TRACE4(( "end compound glyph with %d elements\n", count ));
+ }
+ else
+ {
+ FT_TRACE4(( "simple glyph (offset %lu)\n", offset ));
+
+ /* load a simple glyph */
+ error = pfr_glyph_load_simple( glyph, p, limit );
+
+ FT_FRAME_EXIT();
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ pfr_glyph_load( PFR_Glyph glyph,
+ FT_Stream stream,
+ FT_ULong gps_offset,
+ FT_ULong offset,
+ FT_ULong size )
+ {
+ /* initialize glyph loader */
+ FT_GlyphLoader_Rewind( glyph->loader );
+
+ glyph->num_subs = 0;
+
+ /* load the glyph, recursively when needed */
+ return pfr_glyph_load_rec( glyph, stream, gps_offset, offset, size );
+ }
+
+
+/* END */
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