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libs-back/Source/art/shfill.m
Fred Kiefer 8417031f94 Exchanged appendTransform: and prePendTransform: 
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/back/trunk@18479 72102866-910b-0410-8b05-ffd578937521
2004-01-25 16:50:33 +00:00

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/*
Copyright (C) 2003 Free Software Foundation, Inc.
Author: Alexander Malmberg <alexander@malmberg.org>
This file is part of GNUstep.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
this code is rather experimental
*/
#include <math.h>
#include "ARTGState.h"
#ifndef RDS
#include "x11/XWindowBuffer.h"
#endif
#include "blit.h"
#include <Foundation/NSData.h>
#include <Foundation/NSValue.h>
#include <AppKit/NSAffineTransform.h>
#include <AppKit/NSGraphics.h>
/* TODO: share this with composite.m */
/*
Handle compositing in transformed coordinate spaces. _rect_setup sets up
the a rect_trace_t structure, and each call to _rect_advance returns YES
and the left and right points on the next row, or NO if all rows are done.
*/
typedef struct
{
int x[4], y[4];
int cy, ey;
int left_delta;
int lx, lx_frac, ldx, ldx_frac, l_de, le;
int rx, rx_frac, rdx, rdx_frac, r_de, re;
int cx0, cx1;
} rect_trace_t;
static void _rect_setup(rect_trace_t *t, NSRect r, int cx0, int cx1,
NSAffineTransform *ctm, int up, int *y0, int wi_sy)
{
float fx[4], fy[4];
NSPoint p;
t->cx0 = cx0;
t->cx1 = cx1;
p = r.origin;
p = [ctm pointInMatrixSpace: p];
fx[0] = p.x; fy[0] = p.y;
p = r.origin; p.x += r.size.width;
p = [ctm pointInMatrixSpace: p];
fx[1] = p.x; fy[1] = p.y;
p = r.origin; p.x += r.size.width; p.y += r.size.height;
p = [ctm pointInMatrixSpace: p];
fx[2] = p.x; fy[2] = p.y;
p = r.origin; p.y += r.size.height;
p = [ctm pointInMatrixSpace: p];
fx[3] = p.x; fy[3] = p.y;
if (fabs(fx[0] - floor(fx[0] + .5)) < 0.001) fx[0] = floor(fx[0] + .5);
if (fabs(fx[1] - floor(fx[1] + .5)) < 0.001) fx[1] = floor(fx[1] + .5);
if (fabs(fx[2] - floor(fx[2] + .5)) < 0.001) fx[2] = floor(fx[2] + .5);
if (fabs(fx[3] - floor(fx[3] + .5)) < 0.001) fx[3] = floor(fx[3] + .5);
if (fabs(fy[0] - floor(fy[0] + .5)) < 0.001) fy[0] = floor(fy[0] + .5);
if (fabs(fy[1] - floor(fy[1] + .5)) < 0.001) fy[1] = floor(fy[1] + .5);
if (fabs(fy[2] - floor(fy[2] + .5)) < 0.001) fy[2] = floor(fy[2] + .5);
if (fabs(fy[3] - floor(fy[3] + .5)) < 0.001) fy[3] = floor(fy[3] + .5);
t->x[0] = floor(fx[0]); t->y[0] = wi_sy - floor(fy[0]);
t->x[1] = floor(fx[1]); t->y[1] = wi_sy - floor(fy[1]);
t->x[2] = floor(fx[2]); t->y[2] = wi_sy - floor(fy[2]);
t->x[3] = floor(fx[3]); t->y[3] = wi_sy - floor(fy[3]);
/* If we're tracing the 'other way', we just flip the y-coordinates
and unflip when returning them */
if (up)
{
t->y[0] = -t->y[0];
t->y[1] = -t->y[1];
t->y[2] = -t->y[2];
t->y[3] = -t->y[3];
}
t->cy = t->y[t->le = 0];
if (t->y[1] < t->cy) t->cy = t->y[t->le = 1];
if (t->y[2] < t->cy) t->cy = t->y[t->le = 2];
if (t->y[3] < t->cy) t->cy = t->y[t->le = 3];
t->re = t->le;
t->ey = t->y[0];
if (t->y[1] > t->ey) t->ey = t->y[1];
if (t->y[2] > t->ey) t->ey = t->y[2];
if (t->y[3] > t->ey) t->ey = t->y[3];
if (t->x[(t->le + 1) & 3] < t->x[(t->le - 1) & 3])
t->left_delta = 1;
else
t->left_delta = -1;
/* silence the compiler */
t->lx = t->lx_frac = t->ldx = t->ldx_frac = t->l_de = 0;
t->rx = t->rx_frac = t->rdx = t->rdx_frac = t->r_de = 0;
if (up)
*y0 = -t->cy;
else
*y0 = t->cy;
}
static BOOL _rect_advance(rect_trace_t *t, int *x0, int *x1)
{
int next;
if (t->cy > t->ey)
return NO;
if (t->cy == t->y[t->le])
{
next = (t->le + t->left_delta) & 3;
if (t->y[t->le] == t->y[next])
{
t->le = next;
next = (t->le + t->left_delta) & 3;
}
t->l_de = t->y[next] - t->y[t->le];
if (!t->l_de)
return NO;
t->lx = t->x[t->le];
t->lx_frac = 0;
t->ldx = (t->x[next] - t->x[t->le]) / t->l_de;
t->ldx_frac = (t->x[next] - t->x[t->le]) % t->l_de;
t->le = next;
}
else
{
t->lx += t->ldx;
t->lx_frac += t->ldx_frac;
if (t->lx_frac < 0)
t->lx--, t->lx_frac += t->l_de;
if (t->lx_frac > t->l_de)
t->lx++, t->lx_frac -= t->l_de;
}
if (t->cy == t->y[t->re])
{
next = (t->re - t->left_delta) & 3;
if (t->y[t->re] == t->y[next])
{
t->re = next;
next = (t->re - t->left_delta) & 3;
}
t->r_de = t->y[next] - t->y[t->re];
if (!t->r_de)
return NO;
t->rx = t->x[t->re];
t->rx_frac = t->r_de - 1; /* TODO? */
t->rdx = (t->x[next] - t->x[t->re]) / t->r_de;
t->rdx_frac = (t->x[next] - t->x[t->re]) % t->r_de;
t->re = next;
}
else
{
t->rx += t->rdx;
t->rx_frac += t->rdx_frac;
if (t->rx_frac < 0)
t->rx--, t->rx_frac += t->r_de;
if (t->rx_frac > t->r_de)
t->rx++, t->rx_frac -= t->r_de;
}
if (t->rx > t->lx && t->rx >= t->cx0 && t->lx < t->cx1)
{
*x0 = t->lx - t->cx0;
if (*x0 < 0)
*x0 = 0;
*x1 = t->rx - t->cx0;
if (*x1 > t->cx1 - t->cx0)
*x1 = t->cx1 - t->cx0;
}
else
{
*x0 = *x1 = 0;
}
t->cy++;
return YES;
}
@interface ARTGState (shfill)
-(void) DPSshfill: (NSDictionary *)shader;
@end
@implementation ARTGState (shfill)
typedef struct function_s
{
/* General information about the function. */
int num_in,num_out;
void (*eval)(struct function_s *f,double *in,double *out);
double *domain; /* num_in*2 */
double *range; /* num_out*2 */
/* Type specific information */
int *size; /* num_in */
const unsigned char *data_source;
int bits_per_sample;
double *encode; /* num_in*2 */
double *decode; /* num_out*2 */
/* sample cache for in==2, out==3 */
int sample_index[2];
double sample_cache[4][3];
} function_t;
static double function_getsample(function_t *f,int sample,int i)
{
double v;
if (f->bits_per_sample==8)
{
// printf("get at %i\n",sample*f->num_out+i);
v=f->data_source[sample*f->num_out+i]/255.0;
// printf("got %g\n",v);
}
else if (f->bits_per_sample==16)
{
int c0,c1;
c0=f->data_source[(sample*f->num_out+i)*2+0];
c1=f->data_source[(sample*f->num_out+i)*2+1];
v=(c0*256+c1)/65535.0;
}
else
{
NSLog(@"unhandled bits per sample %i",f->bits_per_sample);
v=0.0;
}
v=f->decode[i*2]+v*(f->decode[i*2+1]-f->decode[i*2]);
if (v<f->range[i*2]) v=f->range[i*2];
if (v>f->range[i*2+1]) v=f->range[i*2+1];
return v;
}
static void function_eval(function_t *f,double *a_in,double *out)
{
double in[f->num_in];
int sample[f->num_in];
int i,j,sample_index,sample_factor;
unsigned int u,v;
double c;
for (i=0;i<f->num_in;i++)
{
in[i]=(a_in[i]-f->domain[i*2])/(f->domain[i*2+1]-f->domain[i*2]);
if (in[i]<0.0) in[i]=0.0;
if (in[i]>1.0) in[i]=1.0;
in[i]=f->encode[i*2]+in[i]*(f->encode[i*2+1]-f->encode[i*2]);
sample[i]=floor(in[i]);
/* we only want sample[i]==f->size[i]-1 when f->size[i]==1 */
if (sample[i]>=f->size[i]-1) sample[i]=f->size[i]-2;
if (sample[i]<0) sample[i]=0;
in[i]=in[i]-sample[i];
if (in[i]<0.0) in[i]=0.0;
if (in[i]>1.0) in[i]=1.0;
// printf(" coord %i, sample %i, frac %g\n",i,sample[i],in[i]);
}
for (i=0;i<f->num_out;i++)
{
double out_value;
/*
iterate over all corners in the f->num_in-dimensional
hypercube we're in
*/
out_value=0.0;
for (u=0;u<1<<f->num_in;u++)
{
sample_index=0;
sample_factor=1;
c=1;
for (v=1,j=0;j<f->num_in;j++,v<<=1)
{
sample_index+=sample[j]*sample_factor;
if (u&v)
{
c*=in[j];
sample_index+=sample_factor;
}
else
c*=(1.0-in[j]);
sample_factor*=f->size[j];
if (c==0.0)
break;
}
// printf(" %08x index %i, factor %i, c=%g\n",u,sample_index,sample_factor,c);
if (c>0.0)
out_value+=c*function_getsample(f,sample_index,i);
}
// printf(" final=%g\n",out_value);
out[i]=out_value;
}
}
/*
special case: f->num_in==2, f->num_out==3
*/
static void function_eval_in2_out3(function_t *f,double *a_in,double *out)
{
double in[2];
int sample[2];
int i;
for (i=0;i<2;i++)
{
in[i]=(a_in[i]-f->domain[i*2])/(f->domain[i*2+1]-f->domain[i*2]);
if (in[i]<0.0) in[i]=0.0;
if (in[i]>1.0) in[i]=1.0;
in[i]=f->encode[i*2]+in[i]*(f->encode[i*2+1]-f->encode[i*2]);
sample[i]=floor(in[i]);
/* we only want sample[i]==f->size[i]-1 when f->size[i]==1 */
if (sample[i]>=f->size[i]-1) sample[i]=f->size[i]-2;
if (sample[i]<0) sample[i]=0;
in[i]=in[i]-sample[i];
if (in[i]<0.0) in[i]=0.0;
if (in[i]>1.0) in[i]=1.0;
// printf(" coord %i, sample %i, frac %g\n",i,sample[i],in[i]);
}
if (sample[0]!=f->sample_index[0] || sample[1]!=f->sample_index[1])
{
f->sample_index[0]=sample[0];
f->sample_index[1]=sample[1];
for (i=0;i<3;i++)
{
f->sample_cache[0][i]=function_getsample(f,sample[0] +(sample[1] )*f->size[0],i);
if (sample[0]+1<f->size[0])
f->sample_cache[1][i]=function_getsample(f,sample[0]+1+(sample[1] )*f->size[0],i);
if (sample[1]+1<f->size[1])
f->sample_cache[2][i]=function_getsample(f,sample[0] +(sample[1]+1)*f->size[0],i);
if (sample[0]+1<f->size[0] && sample[1]+1<f->size[1])
f->sample_cache[3][i]=function_getsample(f,sample[0]+1+(sample[1]+1)*f->size[0],i);
}
}
for (i=0;i<3;i++)
{
double out_value;
double A,B,C,D;
double p,q,pq;
A=f->sample_cache[0][i];
B=f->sample_cache[1][i];
C=f->sample_cache[2][i];
D=f->sample_cache[3][i];
out_value=0.0;
p=in[0];
q=in[1];
pq=p*q;
if (p!=1.0 && q!=1.0) out_value+=A*(1-p-q+pq);
if (p!=0.0 && q!=1.0) out_value+=B*(p-pq);
if (p!=1.0 && q!=0.0) out_value+=C*(q-pq);
if (p!=0.0 && q!=0.0) out_value+=D*pq;
out[i]=out_value;
}
}
static BOOL function_setup(NSDictionary *d,function_t *f)
{
NSNumber *v=[d objectForKey: @"FunctionType"];
NSArray *a;
NSData *data;
int i,j;
if ([v intValue]!=0)
return NO;
memset(f,0,sizeof(function_t));
a=[d objectForKey: @"Size"];
f->num_in=[a count];
if (!f->num_in)
return NO;
f->num_out=[[d objectForKey: @"Range"] count]/2;
if (!f->num_out)
return NO;
f->bits_per_sample=[[d objectForKey: @"BitsPerSample"] intValue];
if (!(f->bits_per_sample==8 || f->bits_per_sample==16))
return NO;
data=[d objectForKey: @"DataSource"];
if (!data || ![data isKindOfClass: [NSData class]])
return NO;
f->data_source=[data bytes];
f->size=malloc(sizeof(int)*f->num_in);
f->domain=malloc(sizeof(double)*f->num_in*2);
f->range=malloc(sizeof(double)*f->num_out*2);
f->encode=malloc(sizeof(double)*f->num_in*2);
f->decode=malloc(sizeof(double)*f->num_out*2);
if (!f->size || !f->domain || !f->range || !f->encode || !f->decode)
{
free(f->size);
f->size=NULL;
free(f->domain);
f->domain=NULL;
free(f->range);
f->range=NULL;
free(f->encode);
f->encode=NULL;
free(f->decode);
f->decode=NULL;
return NO;
}
j=1;
for (i=0;i<f->num_in;i++)
{
f->size[i]=[[a objectAtIndex: i] intValue];
j*=f->size[i];
f->encode[i*2+0]=0;
f->encode[i*2+1]=f->size[i]-1;
}
j*=f->bits_per_sample*f->num_out;
j=(j+7)/8;
if ([data length]<j)
{
free(f->size);
f->size=NULL;
free(f->domain);
f->domain=NULL;
free(f->range);
f->range=NULL;
free(f->encode);
f->encode=NULL;
free(f->decode);
f->decode=NULL;
return NO;
}
a=[d objectForKey: @"Domain"];
for (i=0;i<f->num_in*2;i++)
f->domain[i]=[[a objectAtIndex: i] doubleValue];
a=[d objectForKey: @"Range"];
for (i=0;i<f->num_out*2;i++)
f->decode[i]=f->range[i]=[[a objectAtIndex: i] doubleValue];
a=[d objectForKey: @"Decode"];
if (a)
{
for (i=0;i<f->num_out*2;i++)
f->decode[i]=[[a objectAtIndex: i] doubleValue];
}
a=[d objectForKey: @"Encode"];
if (a)
{
for (i=0;i<f->num_in*2;i++)
f->encode[i]=[[a objectAtIndex: i] doubleValue];
}
f->eval=function_eval;
if (f->num_in==2 && f->num_out==3)
{
f->eval=function_eval_in2_out3;
f->sample_index[0]=f->sample_index[1]=-1;
}
return YES;
}
static void function_free(function_t *f)
{
free(f->size);
f->size=NULL;
free(f->domain);
f->domain=NULL;
free(f->range);
f->range=NULL;
free(f->encode);
f->encode=NULL;
free(f->decode);
f->decode=NULL;
}
/* just fail silently for now */
#define ERROR return
-(void) DPSshfill: (NSDictionary *)shader
{
NSNumber *v;
NSDictionary *function_dict;
function_t function;
NSAffineTransform *matrix,*inverse;
if (!wi || !wi->data || all_clipped) return;
// printf("DPSshfill: %@\n",shader);
v=[shader objectForKey: @"ShadingType"];
/* only type 1 shaders */
if ([v intValue]!=1)
ERROR;
/* in device rgb space */
if ([shader objectForKey: @"ColorSpace"])
if (![[shader objectForKey: @"ColorSpace"] isEqual: NSDeviceRGBColorSpace])
ERROR;
function_dict=[shader objectForKey: @"Function"];
if (!function_dict)
ERROR;
if (!function_setup(function_dict,&function))
ERROR;
if (function.num_in!=2 || function.num_out!=3)
{
function_free(&function);
ERROR;
}
matrix=[ctm copy];
if ([shader objectForKey: @"Matrix"])
{
[matrix prependTransform: [shader objectForKey: @"Matrix"]];
}
inverse=[matrix copy];
[inverse inverse];
{
rect_trace_t rt;
NSRect rect;
int y,x0,x1,x;
render_run_t r;
unsigned char *dst,*dsta;
double in[2],out[3];
NSPoint p;
rect.origin.x=function.domain[0];
rect.size.width=function.domain[1]-function.domain[0];
rect.origin.y=function.domain[2];
rect.size.height=function.domain[3]-function.domain[2];
/* printf("rect=(%g %g)+(%g %g)\n",
rect.origin.x,rect.origin.y,
rect.size.width,rect.size.height);*/
dst=wi->data+wi->bytes_per_line*clip_y0+clip_x0*DI.bytes_per_pixel;
dsta=wi->alpha+wi->sx*clip_y0+clip_x0;
_rect_setup(&rt,rect,clip_x0,clip_x1,matrix,0,&y,wi->sy);
while (y<clip_y0)
{
// printf("skip initial clip y=%i, %i\n",y,clip_y0);
if (!_rect_advance(&rt,&x0,&x1))
goto done;
// printf(" %i %i\n",x0,x1);
y++;
}
if (y>clip_y0)
{
dst+=wi->bytes_per_line*(y-clip_y0);
dsta+=wi->sx*(y-clip_y0);
}
while (y<clip_y1 && _rect_advance(&rt,&x0,&x1))
{
if (!clip_span)
{
r.dst=dst+x0*DI.bytes_per_pixel;
r.dsta=dsta+x0;
p=[inverse transformPoint: NSMakePoint(clip_x0+x0,wi->sy-y)];
in[0]=p.x;
in[1]=p.y;
out[0]=out[1]=out[2]=0.0;
for (x=x0;x<x1;x++)
{
function.eval(&function,in,out);
r.r=out[0]*255;
r.g=out[1]*255;
r.b=out[2]*255;
if (wi->has_alpha)
DI.render_run_opaque_a(&r,1);
else
DI.render_run_opaque(&r,1);
r.dsta++;
r.dst+=DI.bytes_per_pixel;
in[0]+=inverse->matrix.m11;
in[1]+=inverse->matrix.m12;
}
}
else
{
unsigned int *span, *end;
BOOL state = NO;
span = &clip_span[clip_index[y - clip_y0]];
end = &clip_span[clip_index[y - clip_y0 + 1]];
while (span != end && *span < x0)
{
state = !state;
span++;
if (span == end)
break;
}
if (span != end)
{
while (span != end && *span < x1)
{
if (state)
{
p=[inverse transformPoint: NSMakePoint(clip_x0+x0,wi->sy-y)];
in[0]=p.x;
in[1]=p.y;
out[0]=out[1]=out[2]=0.0;
r.dst=dst+x0*DI.bytes_per_pixel;
r.dsta=dsta+x0;
for (x=x0;x<*span;x++)
{
function.eval(&function,in,out);
r.r=out[0]*255;
r.g=out[1]*255;
r.b=out[2]*255;
if (wi->has_alpha)
DI.render_run_opaque_a(&r,1);
else
DI.render_run_opaque(&r,1);
r.dsta++;
r.dst+=DI.bytes_per_pixel;
in[0]+=inverse->matrix.m11;
in[1]+=inverse->matrix.m12;
}
}
x0 = *span;
state = !state;
span++;
if (span == end)
break;
}
if (state)
{
p=[inverse transformPoint: NSMakePoint(clip_x0+x0,wi->sy-y)];
in[0]=p.x;
in[1]=p.y;
out[0]=out[1]=out[2]=0.0;
r.dst=dst+x0*DI.bytes_per_pixel;
r.dsta=dsta+x0;
for (x=x0;x<x1;x++)
{
function.eval(&function,in,out);
r.r=out[0]*255;
r.g=out[1]*255;
r.b=out[2]*255;
if (wi->has_alpha)
DI.render_run_opaque_a(&r,1);
else
DI.render_run_opaque(&r,1);
r.dsta++;
r.dst+=DI.bytes_per_pixel;
in[0]+=inverse->matrix.m11;
in[1]+=inverse->matrix.m12;
}
}
}
}
y++;
dst+=wi->bytes_per_line;
dsta+=wi->sx;
}
}
UPDATE_UNBUFFERED
done:
DESTROY(matrix);
DESTROY(inverse);
function_free(&function);
}
@end
@implementation ARTContext (shfill)
/* TODO: move to gsc? */
-(void) DPSshfill: (NSDictionary *)shader
{
[(ARTGState *)gstate DPSshfill: shader];
}
@end
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