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freetype2
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Code Issues 4 Releases Wiki Activity

Fixed first pass

This commit is contained in:
Anurag Thakur 2022-10-06 02:38:30 +05:30
parent c03591c48a
commit 9538d8e798
2 changed files with 82 additions and 39 deletions
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115
src/dense/ftdense.c
View File

@ -146,20 +146,20 @@ dense_render_line( dense_worker* worker, TPos tox, TPos toy )
to_y = worker->m_h<<6;
}
float x = from_x/64.0;
int x = from_x;
int y0 = from_y>>6;
int y_limit = (to_y + 0x3f)>>6;
float* m_a = worker->m_a;
FT20D12* m_a = worker->m_a;
for ( int y = y0; y < y_limit; y++ )
{
// printf("y is %d\n", y);
int linestart = y * worker->m_w;
float dy = (min( (y + 1)<<6, to_y ) - max( y<<6, from_y ))/64.0;
float xnext = x + dy * deltax/deltay;
float d = dy * dir;
FT26D6 dy = min( (y + 1)<<6, to_y ) - max( y<<6, from_y );
FT26D6 xnext = x + dy * deltax/deltay;
FT26D6 d = dy * dir;
float x0, x1;
FT26D6 x0, x1;
if ( x < xnext )
{
x0 = x;
@ -176,35 +176,59 @@ dense_render_line( dense_worker* worker, TPos tox, TPos toy )
floating-point inaccuracy That would cause an out-of-bounds array access at
index -1.
*/
float x0floor = x0 <= 0.0f ? 0.0f : (float)floor( x0 );
// float x0floor = x0 <= 0.0f ? 0.0f : (float)floor( x0 );
int x0i = x0>>6;
FT26D6 x0floor = x0i<<6;
// float x1ceil = (float)ceil( x1 );
int x1i = (x1+0x3f)>>6;
FT26D6 x1ceil = x1i <<6;
int x0i = (int)x0floor;
float x1ceil = (float)ceil( x1 );
int x1i = (int)x1ceil;
if ( x1i <= x0i + 1 )
{
float xmf = 0.5f * ( x + xnext ) - x0floor;
m_a[linestart + x0i] += d - d * xmf;
//printf("Hit condition 1\n");
FT26D6 xmf = ( ( x + xnext )>>1) - x0floor;
m_a[linestart + x0i] += d * ((1<<6) - xmf);
m_a[linestart + ( x0i + 1 )] += d * xmf;
}
else
{
float s = 1.0f / ( x1 - x0 );
float x0f = x0 - x0floor;
float a0 = 0.5f * s * ( 1.0f - x0f ) * ( 1.0f - x0f );
float x1f = x1 - x1ceil + 1.0f;
float am = 0.5f * s * x1f * x1f;
//printf("Hit condition 2\n");
// float s = 1.0f / ( x1 - x0 );
// float x0f = x0 - x0floor;
// float a0 = 0.5f * s * ( 1.0f - x0f ) * ( 1.0f - x0f );
// float x1f = x1 - x1ceil + 1.0f;
// float am = 0.5f * s * x1f * x1f;
FT26D6 oneOverS = x1 - x0;
FT26D6 x0f = x0 - x0floor;
FT26D6 oneMinusX0f = (1<<6) - x0f;
FT26D6 a0 = ((oneMinusX0f * oneMinusX0f) >> 1) / oneOverS;
FT26D6 x1f = x1 - x1ceil + 1<<6;
FT26D6 am = ((x1f * x1f) >> 1) / oneOverS;
m_a[linestart + x0i] += d * a0;
if ( x1i == x0i + 2 )
m_a[linestart + ( x0i + 1 )] += d * ( 1.0f - a0 - am );
m_a[linestart + ( x0i + 1 )] += d * ( (1<<6) - a0 - am );
else
{
float a1 = s * ( 1.5f - x0f );
//printf("Hit condition 3\n");
FT26D6 a1 = (((1<<6) + (1<<5) - x0f) << 6) / oneOverS;
m_a[linestart + ( x0i + 1 )] += d * ( a1 - a0 );
for ( int xi = x0i + 2; xi < x1i - 1; xi++ )
m_a[linestart + xi] += d * s;
float a2 = a1 + ( x1i - x0i - 3 ) * s;
m_a[linestart + ( x1i - 1 )] += d * ( 1.0f - a2 - am );
FT26D6 dTimesS = (d << 12) / oneOverS;
for ( FT26D6 xi = x0i + 2; xi < x1i - 1; xi++ )
m_a[linestart + xi] += dTimesS;
FT26D6 a2 = a1 + (( x1i - x0i - 3 )<<12)/oneOverS;
m_a[linestart + ( x1i - 1 )] += d * ( (1<<6) - a2 - am );
}
m_a[linestart + x1i] += d * am;
}
@ -394,7 +418,7 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
FT_Error error = FT_Outline_Decompose( &( worker->outline ),
&dense_decompose_funcs, worker );
// Render into bitmap
const float* source = worker->m_a;
const FT20D12* source = worker->m_a;
unsigned char* dest = target->buffer;
unsigned char* dest_end = target->buffer + worker->m_w * worker->m_h;
@ -416,22 +440,41 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
// offset = _mm_shuffle_ps(x, x, _MM_SHUFFLE(3, 3, 3, 3));
// }
float value = 0.0f;
FT20D12 valnew = 0;
//float value = 0.0f;
while ( dest < dest_end )
{
value += *source++;
if ( value > 0.0f )
{
int n = (int)( fabs( value ) * 255.0f + 0.5f );
if ( n > 255 )
n = 255;
*dest = (unsigned char)n;
}
else
valnew += *source++;
// printf("%d\n", *source);
if(valnew > 0){
int nnew = valnew >>2;
if(nnew>255)nnew=255;
*dest = (unsigned char)nnew;
}else{
*dest = 0;
}
dest++;
}
// float value = 0.0f;
// while ( dest < dest_end )
// {
// value += *source++;
// if ( value > 0.0f )
// {
// int n = (int)( fabs( value ) * 255.0f + 0.5f );
// if ( n > 255 )
// n = 255;
// *dest = (unsigned char)n;
// }
// else
// *dest = 0;
// dest++;
// }
free(worker->m_a);
return error;
}
@ -470,10 +513,10 @@ dense_raster_render( FT_Raster raster, const FT_Raster_Params* params )
int size = worker->m_w * worker->m_h + 4;
worker->m_a = malloc( sizeof( float ) * size );
worker->m_a = malloc( sizeof( FT20D12 ) * size );
worker->m_a_size = size;
memset( worker->m_a, 0, ( sizeof( float ) * size ) );
memset( worker->m_a, 0, ( sizeof( FT20D12 ) * size ) );
/* exit if nothing to do */
if ( worker->m_w <= worker->m_origin_x || worker->m_h <= worker->m_origin_y )
{

6
src/dense/ftdense.h
View File

@ -41,13 +41,13 @@ extern "C"
#endif
typedef signed long TPos;
typedef signed long FT26D6;
typedef signed long FT20D12;
typedef signed long long FT26D6;
typedef signed long long FT20D12;
typedef struct
{
/** The array used to store signed area differences. */
float* m_a;
FT20D12* m_a;
/** The number of elements in m_a. */
int m_a_size;
/** The width of the current raster in pixels. */