[dense] Migrate line drawing and accumulation to fixed-point
* src/dense/ftdense.h: (FT26D6, FT20D12): New typedefs * src/dense/ftdense.c: dense_render_line, dense_render_glyph now use fixed-point numbers for calculation Disabled SIMD for now
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@ -81,57 +81,65 @@ dense_line_to( const FT_Vector* to, dense_worker* worker )
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void
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void
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dense_render_line( dense_worker* worker, FT_Pos tox, FT_Pos toy )
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dense_render_line( dense_worker* worker, FT_Pos tox, FT_Pos toy )
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{
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{
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float from_x = worker->prev_x;
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float from_y = worker->prev_y;
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FT26D6 fx = worker->prev_x>>2;
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if ( from_y == toy )
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FT26D6 fy = worker->prev_y>>2;
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FT26D6 from_x = fx;
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FT26D6 from_y = fy;
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FT26D6 tx = tox>>2;
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FT26D6 ty = toy>>2;
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if ( fy == ty )
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return;
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return;
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FT26D6 to_x = tx;
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FT26D6 to_y = ty;
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from_x /= 256.0;
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int dir = 1;
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from_y /= 256.0;
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if ( from_y >= to_y )
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float to_x = tox / 256.0;
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float to_y = toy / 256.0;
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float dir;
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if ( from_y < to_y )
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dir = 1;
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else
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{
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{
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dir = -1;
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dir = -1;
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FT_SWAP(from_x, to_x );
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FT_SWAP(from_x, to_x);
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FT_SWAP(from_y, to_y );
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FT_SWAP(from_y, to_y);
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}
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}
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// Clip to the height.
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// Clip to the height.
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if ( from_y >= worker->m_h || to_y <= 0 )
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if ( from_y >= worker->m_h<<6 || to_y <= 0 )
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return;
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return;
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float dxdy = ( to_x - from_x ) / (float)( to_y - from_y );
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FT26D6 deltax,deltay;
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deltax = to_x - from_x;
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deltay = to_y - from_y;
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if ( from_y < 0 )
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if ( from_y < 0 )
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{
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{
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from_x -= from_y * dxdy;
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from_x -= from_y * deltax/deltay;
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from_y = 0;
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from_y = 0;
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}
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}
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if ( to_y > worker->m_h )
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if ( to_y > worker->m_h<<6 )
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{
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{
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to_x -= ( to_y - worker->m_h ) * dxdy;
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to_x -= (( to_y - worker->m_h<<6 ) * deltax/deltay);
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to_y = (float)worker->m_h;
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to_y = worker->m_h<<6;
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}
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}
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float x = from_x;
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int x = from_x;
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int y0 = (int)from_y;
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int y0 = from_y>>6;
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int y_limit = (int)ceil( to_y );
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int y_limit = (to_y + 0x3f)>>6;
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float* m_a = worker->m_a;
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FT20D12* m_a = worker->m_a;
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for ( int y = y0; y < y_limit; y++ )
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for ( int y = y0; y < y_limit; y++ )
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{
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{
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int linestart = y * worker->m_w;
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int linestart = y * worker->m_w;
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float dy = fmin( y + 1.0f, to_y ) - fmax( (float)y, from_y );
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FT26D6 dy = FT_MIN( (y + 1)<<6, to_y ) - FT_MAX( y<<6, from_y );
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float xnext = x + dxdy * dy;
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FT26D6 xnext = x + dy * deltax/deltay;
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float d = dy * dir;
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FT26D6 d = dy * dir;
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float x0, x1;
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FT26D6 x0, x1;
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if ( x < xnext )
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if ( x < xnext )
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{
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{
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x0 = x;
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x0 = x;
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@ -143,40 +151,48 @@ dense_render_line( dense_worker* worker, FT_Pos tox, FT_Pos toy )
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x1 = x;
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x1 = x;
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}
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}
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/*
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It's possible for x0 to be negative on the last scanline because of
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floating-point inaccuracy That would cause an out-of-bounds array access at
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index -1.
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*/
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float x0floor = x0 <= 0.0f ? 0.0f : (float)floor( x0 );
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int x0i = (int)x0floor;
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int x0i = x0>>6;
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float x1ceil = (float)ceil( x1 );
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FT26D6 x0floor = x0i<<6;
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int x1i = (int)x1ceil;
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int x1i = (x1+0x3f)>>6;
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FT26D6 x1ceil = x1i <<6;
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if ( x1i <= x0i + 1 )
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if ( x1i <= x0i + 1 )
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{
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{
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float xmf = 0.5f * ( x + xnext ) - x0floor;
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FT26D6 xmf = ( ( x + xnext )>>1) - x0floor;
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m_a[linestart + x0i] += d - d * xmf;
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m_a[linestart + x0i] += d * ((1<<6) - xmf);
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m_a[linestart + ( x0i + 1 )] += d * xmf;
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m_a[linestart + ( x0i + 1 )] += d * xmf;
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}
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}
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else
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else
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{
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{
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float s = 1.0f / ( x1 - x0 );
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float x0f = x0 - x0floor;
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FT26D6 oneOverS = x1 - x0;
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float a0 = 0.5f * s * ( 1.0f - x0f ) * ( 1.0f - x0f );
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FT26D6 x0f = x0 - x0floor;
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float x1f = x1 - x1ceil + 1.0f;
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float am = 0.5f * s * x1f * x1f;
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FT26D6 oneMinusX0f = (1<<6) - x0f;
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FT26D6 a0 = ((oneMinusX0f * oneMinusX0f) >> 1) / oneOverS;
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FT26D6 x1f = x1 - x1ceil + (1<<6);
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FT26D6 am = ((x1f * x1f) >> 1) / oneOverS;
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m_a[linestart + x0i] += d * a0;
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m_a[linestart + x0i] += d * a0;
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if ( x1i == x0i + 2 )
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if ( x1i == x0i + 2 )
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m_a[linestart + ( x0i + 1 )] += d * ( 1.0f - a0 - am );
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m_a[linestart + ( x0i + 1 )] += d * ( (1<<6) - a0 - am );
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else
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else
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{
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{
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float a1 = s * ( 1.5f - x0f );
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FT26D6 a1 = (((1<<6) + (1<<5) - x0f) << 6) / oneOverS;
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m_a[linestart + ( x0i + 1 )] += d * ( a1 - a0 );
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m_a[linestart + ( x0i + 1 )] += d * ( a1 - a0 );
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for ( int xi = x0i + 2; xi < x1i - 1; xi++ )
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m_a[linestart + xi] += d * s;
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FT26D6 dTimesS = (d << 12) / oneOverS;
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float a2 = a1 + ( x1i - x0i - 3 ) * s;
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m_a[linestart + ( x1i - 1 )] += d * ( 1.0f - a2 - am );
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for ( FT26D6 xi = x0i + 2; xi < x1i - 1; xi++ )
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m_a[linestart + xi] += dTimesS;
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FT26D6 a2 = a1 + (( x1i - x0i - 3 )<<12)/oneOverS;
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m_a[linestart + ( x1i - 1 )] += d * ( (1<<6) - a2 - am );
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}
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}
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m_a[linestart + x1i] += d * am;
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m_a[linestart + x1i] += d * am;
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}
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}
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@ -364,48 +380,49 @@ dense_render_glyph( dense_worker* worker, const FT_Bitmap* target )
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FT_Error error = FT_Outline_Decompose( &( worker->outline ),
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FT_Error error = FT_Outline_Decompose( &( worker->outline ),
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&dense_decompose_funcs, worker );
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&dense_decompose_funcs, worker );
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// Render into bitmap
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// Render into bitmap
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const float* source = worker->m_a;
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const FT20D12* source = worker->m_a;
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unsigned char* dest = target->buffer;
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unsigned char* dest = target->buffer;
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unsigned char* dest_end = target->buffer + worker->m_w * worker->m_h;
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unsigned char* dest_end = target->buffer + worker->m_w * worker->m_h;
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#if FT_SSE4_1
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//#if FT_SSE4_1
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__m128 offset = _mm_setzero_ps();
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// __m128 offset = _mm_setzero_ps();
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__m128i mask = _mm_set1_epi32(0x0c080400);
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// __m128i mask = _mm_set1_epi32(0x0c080400);
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__m128 sign_mask = _mm_set1_ps(-0.f);
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// __m128 sign_mask = _mm_set1_ps(-0.f);
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for (int i = 0; i < worker->m_h*worker->m_w; i += 4) {
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// for (int i = 0; i < worker->m_h*worker->m_w; i += 4) {
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__m128 x = _mm_load_ps(&source[i]);
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// __m128 x = _mm_load_ps(&source[i]);
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x = _mm_add_ps(x, _mm_castsi128_ps(_mm_slli_si128(_mm_castps_si128(x), 4)));
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// x = _mm_add_ps(x, _mm_castsi128_ps(_mm_slli_si128(_mm_castps_si128(x), 4)));
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x = _mm_add_ps(x, _mm_shuffle_ps(_mm_setzero_ps(), x, 0x40));
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// x = _mm_add_ps(x, _mm_shuffle_ps(_mm_setzero_ps(), x, 0x40));
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x = _mm_add_ps(x, offset);
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// x = _mm_add_ps(x, offset);
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__m128 y = _mm_andnot_ps(sign_mask, x); // fabs(x)
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// __m128 y = _mm_andnot_ps(sign_mask, x); // fabs(x)
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y = _mm_min_ps(y, _mm_set1_ps(1.0f));
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// y = _mm_min_ps(y, _mm_set1_ps(1.0f));
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y = _mm_mul_ps(y, _mm_set1_ps(255.0f));
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// y = _mm_mul_ps(y, _mm_set1_ps(255.0f));
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__m128i z = _mm_cvtps_epi32(y);
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// __m128i z = _mm_cvtps_epi32(y);
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z = _mm_shuffle_epi8(z, mask);
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// z = _mm_shuffle_epi8(z, mask);
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_mm_store_ss((float *)&dest[i], (__m128)z);
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// _mm_store_ss((float *)&dest[i], (__m128)z);
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offset = _mm_shuffle_ps(x, x, _MM_SHUFFLE(3, 3, 3, 3));
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// offset = _mm_shuffle_ps(x, x, _MM_SHUFFLE(3, 3, 3, 3));
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}
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// }
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#else /* FT_SSE4_1 */
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//#else /* FT_SSE4_1 */
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FT20D12 value = 0;
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float value = 0.0f;
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while ( dest < dest_end )
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while ( dest < dest_end )
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{
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{
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value += *source++;
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value += *source++;
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if ( value > 0.0f )
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{
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if(value > 0){
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int n = (int)( fabs( value ) * 255.0f + 0.5f );
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int n = value >>4;
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if ( n > 255 )
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n = 255;
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if(n>255)n=255;
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*dest = (unsigned char)n;
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*dest = (unsigned char)n;
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}
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}else{
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else
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*dest = 0;
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*dest = 0;
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}
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dest++;
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dest++;
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}
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}
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#endif /* FT_SSE4_1 */
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//#endif /* FT_SSE4_1 */
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free(worker->m_a);
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free(worker->m_a);
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return error;
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return error;
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@ -444,10 +461,10 @@ dense_raster_render( FT_Raster raster, const FT_Raster_Params* params )
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int size = worker->m_w * worker->m_h + 4;
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int size = worker->m_w * worker->m_h + 4;
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worker->m_a = malloc( sizeof( float ) * size );
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worker->m_a = malloc( sizeof( FT20D12 ) * size );
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worker->m_a_size = size;
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worker->m_a_size = size;
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memset( worker->m_a, 0, ( sizeof( float ) * size ) );
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memset( worker->m_a, 0, ( sizeof( FT20D12 ) * size ) );
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/* exit if nothing to do */
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/* exit if nothing to do */
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if ( worker->m_w <= worker->m_origin_x || worker->m_h <= worker->m_origin_y )
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if ( worker->m_w <= worker->m_origin_x || worker->m_h <= worker->m_origin_y )
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{
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{
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@ -19,6 +19,10 @@ extern "C"
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{
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{
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#endif
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#endif
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typedef signed long long FT26D6; /* 26.6 fixed-point representation */
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typedef signed long long FT20D12; /* 20.12 fixed-point representation */
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typedef struct
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typedef struct
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{
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{
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/** The array used to store signed area differences. */
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/** The array used to store signed area differences. */
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