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freetype2
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Code Issues 4 Releases Wiki Activity

Fix antialiasing

This commit is contained in:
Anurag Thakur 2022-08-11 17:19:16 +05:30
parent edd9a84c36
commit 1cf8e2ed5d
2 changed files with 20 additions and 21 deletions
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40
src/dense/ftdense.c
View File

@ -52,7 +52,7 @@ dense_move_to( const FT_Vector* to, dense_worker* worker )
static int
dense_line_to( const FT_Vector* to, dense_worker* worker )
{
// printf( "dense_line_to: %d, %d\n", to->x, to->y );
//printf( "dense_line_to: %d, %d\n", to->x, to->y );
dense_render_line( worker, UPSCALE( to->x ), UPSCALE( to->y ) );
dense_move_to( to, worker );
return 0;
@ -76,6 +76,8 @@ swapold( unsigned char* a, unsigned char* b )
void
dense_render_line( dense_worker* worker, TPos to_x, TPos to_y )
{
// printf("line from: %d, %d to %d, %d\n", worker->prev_x, worker->prev_y,
// to_x, to_y);
TPos from_x = worker->prev_x;
TPos from_y = worker->prev_y;
if ( from_y == to_y )
@ -238,6 +240,7 @@ dense_conic_to( const FT_Vector* control,
const FT_Vector* to,
dense_worker* worker )
{
//printf( "dense_conic_to: %d, %d\n", to->x, to->y );
dense_render_quadratic( worker, control, to );
return 0;
}
@ -259,9 +262,9 @@ dense_render_quadratic( dense_worker* worker,
The division by four is omitted to save time.
*/
FT_Vector aP0 = { worker->prev_x, worker->prev_y };
FT_Vector aP1 = { UPSCALE( control->x ), UPSCALE( control->y ) };
FT_Vector aP2 = { UPSCALE( to->x ), UPSCALE( to->y ) };
FT_Vector aP0 = { DOWNSCALE( worker->prev_x ), DOWNSCALE( worker->prev_y ) };
FT_Vector aP1 = { control->x, control->y };
FT_Vector aP2 = { to->x, to->y };
float devx = aP0.x - aP1.x - aP1.x + aP2.x;
float devy = aP0.y - aP1.y - aP1.y + aP2.y;
@ -269,9 +272,7 @@ dense_render_quadratic( dense_worker* worker,
if ( devsq < 0.333f )
{
dense_render_line( worker, aP2.x, aP2.y );
worker->prev_x = aP2.x;
worker->prev_y = aP2.y;
dense_line_to( &aP2, worker );
return;
}
@ -285,24 +286,23 @@ dense_render_quadratic( dense_worker* worker,
expected to be 33% more in the limit".
*/
const float tol = 3.0f;
int n = (int)floor( sqrt( sqrt( tol * devsq ) ) );
FT_Vector p = aP0;
float nrecip = 1.0f / ( n + 1.0f );
float t = 0.0f;
const float tol = 3.0f;
int n = (int)floor( sqrt( sqrt( tol * devsq ) ) )/8;
//printf( "n is %d\n", n );
FT_Vector p = aP0;
float nrecip = 1.0f / ( n + 1.0f );
float t = 0.0f;
for ( int i = 0; i < n; i++ )
{
t += nrecip;
FT_Vector next = Lerp( t, Lerp( t, aP0, aP1 ), Lerp( t, aP1, aP2 ) );
dense_render_line( worker, next.x, next.y );
worker->prev_x = next.x;
worker->prev_y = next.y;
dense_line_to(&next, worker );
p = next;
}
dense_render_line( worker, aP2.x, aP2.y );
worker->prev_x = aP2.x;
worker->prev_y = aP2.y;
dense_line_to( &aP2, worker );
// worker->prev_x = aP2.x;
// worker->prev_y = aP2.y;
}
static int
@ -375,7 +375,6 @@ dense_raster_new( FT_Memory memory, dense_PRaster* araster )
static void
dense_raster_done( FT_Raster raster )
{
FT_Memory memory = (FT_Memory)( (dense_PRaster)raster )->memory;
FT_FREE( raster );
@ -455,11 +454,10 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
static int
dense_raster_render( FT_Raster raster, const FT_Raster_Params* params )
{
const FT_Outline* outline = (const FT_Outline*)params->source;
const FT_Bitmap* target_map = params->target;
//dense_worker* worker = malloc( sizeof( dense_worker ) );
// dense_worker* worker = malloc( sizeof( dense_worker ) );
dense_worker worker[1];
if ( !raster )

1
src/dense/ftdenserend.c
View File

@ -54,6 +54,7 @@ ft_dense_render( FT_Renderer render,
FT_Render_Mode mode,
const FT_Vector* origin )
{
// printf("ft_dense_render\n");
FT_Error error = FT_Err_Ok;
FT_Outline* outline = &slot->outline;
FT_Bitmap* bitmap = &slot->bitmap;