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Implement FREETYPE_CUSTOM_GEOMETRY environment variable for unusual subpixel formats #1

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Implement FREETYPE_CUSTOM_GEOMETRY environment variable for unusual subpixel formats #1

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3 changes: 3 additions & 0 deletions include/freetype/ftmodapi.h
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Original file line number Diff line number Diff line change
Expand Up @@ -522,6 +522,9 @@ FT_BEGIN_HEADER
FT_EXPORT( void )
FT_Set_Default_Properties( FT_Library library );

FT_EXPORT( void )
FT_Set_Custom_Geometry( FT_Library library );


/**************************************************************************
*
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101 changes: 101 additions & 0 deletions src/base/ftinit.c
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Expand Up @@ -106,11 +106,112 @@

#define MAX_LENGTH 128

FT_EXPORT_DEF( void )
FT_Set_Custom_Geometry( FT_Library library )
{
const char* env;
const char* p;

int vecr_x = 0;
int vecr_y = 0;
int vecg_x = 0;
int vecg_y = 0;
int vecb_x = 0;
int vecb_y = 0;

char buffer[MAX_LENGTH + 1];

int negative = 0;
int vector_index = 0;
int i = 0;
int val = 0;

env = ft_getenv( "FREETYPE_CUSTOM_GEOMETRY" );
if ( !env ) {
FT_TRACE0(("No FREETYPE_CUSTOM_GEOMETRY\n"));
return;
}

for ( p = env; ; p++ )
{
FT_TRACE0(("FTCG: %c\n", *p));

/* skip leading whitespace and separators */
if ( *p == ' ' || *p == '\t' )
continue;

/* Read vector data */
if ( *p == '-') {
negative = 1;
continue;
}

if ( *p == ',' || !*p ) {
buffer[i] = '\0';
val = atoi(buffer);

if (negative != 0) {
val = -val;
}

negative = 0;
i = 0;

if (vector_index == 0)
vecr_x = val;
else if (vector_index == 1)
vecr_y = val;
else if (vector_index == 2)
vecg_x = val;
else if (vector_index == 3)
vecg_y = val;
else if (vector_index == 4)
vecb_x = val;
else if (vector_index == 5)
vecb_y = val;
else
break;

if (!*p)
break;

vector_index++;

continue;
}

if (!*p)
break;

buffer[i++] = *p;
}

FT_TRACE0(("FREETYPE_CUSTOM_GEOMETRY: %d,%d %d,%d %d,%d\n",
vecr_x, vecr_y,
vecg_x, vecg_y,
vecb_x, vecb_y));

//R
library->lcd_geometry[0].x = vecr_x;
library->lcd_geometry[0].y = vecr_y;

//G
library->lcd_geometry[1].x = vecg_x;
library->lcd_geometry[1].y = vecg_y;

//B
library->lcd_geometry[2].x = vecb_x;
library->lcd_geometry[2].y = vecb_y;
}

/* documentation is in ftmodapi.h */

FT_EXPORT_DEF( void )
FT_Set_Default_Properties( FT_Library library )
{

FT_Set_Custom_Geometry(library);

const char* env;
const char* p;
const char* q;
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