Fix quadratic rendering
This commit is contained in:
Anurag Thakur
parent
8af62c3469
commit
d9c301d35a
@ -4,11 +4,11 @@
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#undef FT_COMPONENT
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#define FT_COMPONENT dense
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#include "ftdense.h"
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#include <freetype/ftoutln.h>
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#include <freetype/internal/ftcalc.h>
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#include <freetype/internal/ftdebug.h>
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#include <freetype/internal/ftobjs.h>
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#include "ftdense.h"
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#include <math.h>
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#include "ftdenseerrs.h"
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@ -17,20 +17,17 @@
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#define PIXEL_BITS 8
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#define ONE_PIXEL ( 1 << PIXEL_BITS )
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#define TRUNC( x ) ( int )( ( x ) >> PIXEL_BITS )
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#define TRUNC( x ) (int)( ( x ) >> PIXEL_BITS )
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#define UPSCALE( x ) ( ( x ) * ( ONE_PIXEL >> 6 ) )
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#define DOWNSCALE( x ) ( ( x ) >> ( PIXEL_BITS - 6 ) )
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typedef struct dense_TRaster_
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{
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void* memory;
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} dense_TRaster, *dense_PRaster;
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static RasterFP_Point
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Lerp( float aT, RasterFP_Point aP0, RasterFP_Point aP1 )
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{
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@ -49,29 +46,33 @@ dense_move_to( const FT_Vector* to, RasterFP* aRasterFP )
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y = UPSCALE( to->y );
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aRasterFP->prev_x = x;
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aRasterFP->prev_y = y;
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//printf( "last point is {%f, %f}", lp.m_x, lp.m_y );
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// printf( "last point is {%f, %f}", lp.m_x, lp.m_y );
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return 0;
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}
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static int
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dense_line_to( const FT_Vector* to, RasterFP* aRasterFP )
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{
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printf("dense_line_to: %d, %d\n", to->x, to->y);
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RasterFP_Point tp = {UPSCALE(to->x), UPSCALE(to->y)};
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printf( "dense_line_to: %d, %d\n", to->x, to->y );
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RasterFP_Point tp = { UPSCALE( to->x ), UPSCALE( to->y ) };
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RasterFP_DrawLine( aRasterFP, tp.m_x, tp.m_y );
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dense_move_to( to, aRasterFP );
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return 0;
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}
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void swap(long int *a, long int *b){
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void
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swap( long int* a, long int* b )
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{
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long int temp = *a;
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*a = *b;
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*b = temp;
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*a = *b;
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*b = temp;
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}
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void swapold(unsigned char *a, unsigned char *b){
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void
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swapold( unsigned char* a, unsigned char* b )
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{
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unsigned char temp = *a;
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*a = *b;
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*b = temp;
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*a = *b;
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*b = temp;
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}
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void
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@ -88,19 +89,19 @@ RasterFP_DrawLine( RasterFP* aRasterFP, TPos to_x, TPos to_y )
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// aP1.m_x -= aRasterFP->m_origin_x;
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// aP1.m_y -= aRasterFP->m_origin_y;
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from_x = TRUNC((int)from_x );
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from_y = TRUNC((int)from_y );
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to_x = TRUNC((int)to_x );
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to_y = TRUNC((int)to_y );
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from_x = TRUNC( (int)from_x );
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from_y = TRUNC( (int)from_y );
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to_x = TRUNC( (int)to_x );
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to_y = TRUNC( (int)to_y );
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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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dir = -1;
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swap(&from_x, &to_x);
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swap(&from_y, &to_y);
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dir = -1;
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swap( &from_x, &to_x );
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swap( &from_y, &to_y );
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}
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// Clip to the height.
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@ -125,21 +126,21 @@ RasterFP_DrawLine( RasterFP* aRasterFP, TPos to_x, TPos to_y )
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by recursive calls.
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*/
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/* @QUES: This code isn't present in font-rs. It was added later by graham asher
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I have a very strong feeling that this isn't necessary.
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Since probably the outline is already fitted in the bounding box. I tested
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this code a little, removing it doesn't seem to make any difference*/
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/* @QUES: This code isn't present in font-rs. It was added later by graham
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asher I have a very strong feeling that this isn't necessary. Since probably
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the outline is already fitted in the bounding box. I tested this code a
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little, removing it doesn't seem to make any difference*/
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RasterFP_Point intersect = { 0, 0 };
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int recursive = 0;
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if ( from_x >= aRasterFP->m_w && to_x >= aRasterFP->m_w )
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{
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from_x = to_x = (float)aRasterFP->m_w;
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dxdy = 0;
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dxdy = 0;
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}
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else if ( from_x <= 0 && to_x <= 0 )
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{
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from_x = to_x = 0;
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dxdy = 0;
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dxdy = 0;
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}
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else if ( ( from_x < 0 ) != ( to_x < 0 ) )
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{
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@ -180,7 +181,6 @@ RasterFP_DrawLine( RasterFP* aRasterFP, TPos to_x, TPos to_y )
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int y_limit = (int)ceil( to_y );
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float* m_a = aRasterFP->m_a;
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for ( int y = y0; y < y_limit; y++ )
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{
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int linestart = y * aRasterFP->m_w;
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@ -254,11 +254,10 @@ dense_conic_to( const FT_Vector* control,
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}
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void
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RasterFP_DrawQuadratic( RasterFP* aRasterFP,
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RasterFP_DrawQuadratic( RasterFP* aRasterFP,
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const FT_Vector* control,
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const FT_Vector* to )
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{
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// assert( aRasterFP );
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/*
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Calculate devsq as the square of four times the
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@ -272,21 +271,23 @@ RasterFP_DrawQuadratic( RasterFP* aRasterFP,
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The division by four is omitted to save time.
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*/
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RasterFP_Point aP0 = {aRasterFP->prev_x, aRasterFP->prev_y};
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RasterFP_Point aP1 = {UPSCALE(control->x), UPSCALE(control->y)};
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RasterFP_Point aP2 = {UPSCALE(to->x), UPSCALE(to->y)};
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RasterFP_Point aP0 = { aRasterFP->prev_x, aRasterFP->prev_y };
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RasterFP_Point aP1 = { UPSCALE( control->x ), UPSCALE( control->y ) };
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RasterFP_Point aP2 = { UPSCALE( to->x ), UPSCALE( to->y ) };
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float devx = aP0.m_x - aP1.m_x - aP1.m_x + aP2.m_x;
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float devy = aP0.m_y - aP1.m_y - aP1.m_y + aP2.m_y;
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float devsq = devx * devx + devy * devy;
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if ( devsq < 0.333f )
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{
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RasterFP_DrawLine(aRasterFP, aP2.m_x, aP2.m_y );
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RasterFP_DrawLine( aRasterFP, aP2.m_x, aP2.m_y );
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aRasterFP->prev_x = aP2.m_x;
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aRasterFP->prev_y = aP2.m_y;
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return;
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}
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/*
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According to Raph Levien, the reason for the subdivision by n (instead of
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@ -298,20 +299,25 @@ RasterFP_DrawQuadratic( RasterFP* aRasterFP,
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expected to be 33% more in the limit".
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*/
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const float tol = 3.0f;
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int n = (int)floor( sqrt( sqrt( tol * devsq ) ) );
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// RasterFP_Point p = aP0;
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RasterFP_Point p = aP0;
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float nrecip = 1.0f / ( n + 1.0f );
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float t = 0.0f;
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for ( int i = 0; i < n; i++ )
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{
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t += nrecip;
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RasterFP_Point next = Lerp( t, Lerp( t, aP0, aP1 ), Lerp( t, aP1, aP2 ) );
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RasterFP_DrawLine(aRasterFP , next.m_x, next.m_y);
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//p = next;
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RasterFP_DrawLine( aRasterFP, next.m_x, next.m_y );
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aRasterFP->prev_x = next.m_x;
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aRasterFP->prev_y = next.m_y;
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p = next;
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}
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RasterFP_DrawLine( aRasterFP, aP2.m_x, aP2.m_y);
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RasterFP_DrawLine(aRasterFP,aP2.m_x,aP2.m_y);
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aRasterFP->prev_x = aP2.m_x;
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aRasterFP->prev_y = aP2.m_y;
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}
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static int
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@ -320,11 +326,11 @@ dense_cubic_to( const FT_Vector* control1,
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const FT_Vector* to,
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RasterFP* aRasterFP )
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{
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RasterFP_Point ap1 = { UPSCALE(control1->x), UPSCALE(control1->y) };
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RasterFP_Point ap2 = { UPSCALE(control2->x), UPSCALE(control2->y) };
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RasterFP_Point ap3 = { UPSCALE(to->x), UPSCALE(to->y) };
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RasterFP_Point ap1 = { UPSCALE( control1->x ), UPSCALE( control1->y ) };
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RasterFP_Point ap2 = { UPSCALE( control2->x ), UPSCALE( control2->y ) };
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RasterFP_Point ap3 = { UPSCALE( to->x ), UPSCALE( to->y ) };
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RasterFP_Point lP = {aRasterFP->prev_x, aRasterFP->prev_y};
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RasterFP_Point lP = { aRasterFP->prev_x, aRasterFP->prev_y };
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RasterFP_DrawCubic( aRasterFP, lP, ap1, ap2, ap3 );
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return 0;
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@ -349,7 +355,7 @@ RasterFP_DrawCubic( RasterFP* aRasterFP,
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if ( devsq < 0.333f )
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{
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RasterFP_DrawLine( aRasterFP, aP3.m_x , aP3.m_y);
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RasterFP_DrawLine( aRasterFP, aP3.m_x, aP3.m_y );
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return;
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}
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@ -383,7 +389,7 @@ dense_raster_new( FT_Memory memory, dense_PRaster* araster )
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raster->memory = memory;
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*araster = raster;
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printf("dense_raster_new\n");
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printf( "dense_raster_new\n" );
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return error;
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}
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@ -406,7 +412,7 @@ dense_raster_reset( FT_Raster raster,
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FT_UNUSED( raster );
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FT_UNUSED( pool_base );
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FT_UNUSED( pool_size );
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printf("dense_raster_reset\n");
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printf( "dense_raster_reset\n" );
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}
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/* @QUES: This methodisnt't called in normal ftlint execution*/
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@ -417,7 +423,7 @@ dense_raster_set_mode( FT_Raster raster, unsigned long mode, void* args )
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FT_UNUSED( mode );
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FT_UNUSED( args );
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printf("dense_raster_set_mode\n");
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printf( "dense_raster_set_mode\n" );
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return 0; /* nothing to do */
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}
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@ -432,10 +438,9 @@ FT_DEFINE_OUTLINE_FUNCS( dense_decompose_funcs,
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0 /* delta */
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)
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/* @QUES: So, this calls FT_Outline_Decompose, that calls the move to,
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line to, conic to, cubic to interface methods. The aRasterFP structure stores the
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well, stuff in its m_a and finally renders it to the target->buffer*/
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/* @QUES: So, this calls FT_Outline_Decompose, that calls the move to,
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line to, conic to, cubic to interface methods. The aRasterFP structure stores
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the well, stuff in its m_a and finally renders it to the target->buffer*/
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static int
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dense_render_glyph( RasterFP* aRasterFP, const FT_Bitmap* target )
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{
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@ -444,37 +449,36 @@ dense_render_glyph( RasterFP* aRasterFP, const FT_Bitmap* target )
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// Render into bitmap
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const float* source = aRasterFP->m_a;
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//printf( "Outputting bitmap\n" );
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// for ( int i = 0; i < aRasterFP->m_h; i++ )
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// {
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// printf( "\n" );
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// for ( int j = 0; j < aRasterFP->m_w; j++ )
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// {
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// float strength = *( source + ( i * aRasterFP->m_w + j ) );
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// if ( strength > 0.90 )
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// {
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// printf( "@|" );
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// }
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// else if ( strength > 0.70 )
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// {
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// printf( "#|" );
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// }
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// else if ( strength > 0.45 )
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// {
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// printf( "+|" );
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// }
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// else if ( strength > 0.20 )
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// {
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// printf( "*|" );
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// }
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// else
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// {
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// printf( ".|" );
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// }
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// }
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// }
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// printf( "\n" );
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// printf( "Outputting bitmap\n" );
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// for ( int i = 0; i < aRasterFP->m_h; i++ )
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// {
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// printf( "\n" );
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// for ( int j = 0; j < aRasterFP->m_w; j++ )
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// {
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// float strength = *( source + ( i * aRasterFP->m_w + j ) );
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// if ( strength > 0.90 )
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// {
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// printf( "@|" );
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// }
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// else if ( strength > 0.70 )
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// {
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// printf( "#|" );
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// }
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// else if ( strength > 0.45 )
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// {
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// printf( "+|" );
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// }
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// else if ( strength > 0.20 )
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// {
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// printf( "*|" );
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// }
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// else
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// {
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// printf( ".|" );
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// }
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// }
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// }
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// printf( "\n" );
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unsigned char* dest = target->buffer;
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unsigned char* dest_end = target->buffer + aRasterFP->m_w * aRasterFP->m_h;
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@ -494,17 +498,18 @@ dense_render_glyph( RasterFP* aRasterFP, const FT_Bitmap* target )
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dest++;
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}
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for (int col = 0; col < aRasterFP->m_w; col++)
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for ( int col = 0; col < aRasterFP->m_w; col++ )
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{
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for (int row = 0; row < aRasterFP->m_h/2; row++)
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for ( int row = 0; row < aRasterFP->m_h / 2; row++ )
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{
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//printf("Swapping position: %d, %d with %d, %d with rows = %d, cols = %d",row,col, aRasterFP->m_h-row, col, aRasterFP->m_h, aRasterFP->m_w);
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swapold(target->buffer + aRasterFP->m_w*row + col, target->buffer + (aRasterFP->m_h-row-1)*aRasterFP->m_w + col);
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// printf("Swapping position: %d, %d with %d, %d with rows = %d, cols =
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// %d",row,col, aRasterFP->m_h-row, col, aRasterFP->m_h, aRasterFP->m_w);
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swapold( target->buffer + aRasterFP->m_w * row + col,
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target->buffer + ( aRasterFP->m_h - row - 1 ) * aRasterFP->m_w +
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col );
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}
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}
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return error;
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}
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@ -541,8 +546,8 @@ dense_raster_render( FT_Raster raster, const FT_Raster_Params* params )
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aRasterFP->m_origin_x = 0;
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aRasterFP->m_origin_y = 0;
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/* @QUES: Why are my bitmaps upsied down 😭*/
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aRasterFP->m_w = target_map->pitch;
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aRasterFP->m_h = target_map->rows;
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aRasterFP->m_w = target_map->pitch;
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aRasterFP->m_h = target_map->rows;
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int size = aRasterFP->m_w * aRasterFP->m_h + 4;
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