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#include <fitz.h>
enum { HS = 17, VS = 15, SF = 1 };
static fz_error *pathtogel(fz_gel *gel, fz_pathnode *path, fz_matrix ctm)
{
float flatness = 0.3 / sqrt(fabs(ctm.a * ctm.d - ctm.b * ctm.c));
if (flatness < 0.1)
flatness = 0.1;
if (path->paint == FZ_STROKE)
{
if (path->dash)
return fz_dashpath(gel, path, ctm, flatness);
return fz_strokepath(gel, path, ctm, flatness);
}
return fz_fillpath(gel, path, ctm, flatness);
}
static void blitcolorspan(int y, int x, int n, unsigned char *alpha, void *userdata)
{
fz_renderer *gc = userdata;
fz_pixmap *pix = gc->acc;
unsigned char sa;
unsigned char ssa;
unsigned char *p;
unsigned char r = gc->r;
unsigned char g = gc->g;
unsigned char b = gc->b;
if (x < pix->x)
{
alpha += pix->x - x;
n -= pix->x - x;
x = pix->x;
}
if (x + n > pix->x + pix->w)
n = pix->x + pix->w - x;
if (n < 0)
return;
p = pix->samples + ((y - pix->y) * pix->w + (x - pix->x)) * pix->n;
while (n--)
{
sa = *alpha++ * SF;
ssa = 255 - sa;
p[0] = sa + fz_mul255(p[0], ssa);
p[1] = fz_mul255(r, sa) + fz_mul255(p[1], ssa);
p[2] = fz_mul255(g, sa) + fz_mul255(p[2], ssa);
p[3] = fz_mul255(b, sa) + fz_mul255(p[3], ssa);
p += 4;
}
}
static void blitalphaspan(int y, int x, int n, unsigned char *alpha, void *userdata)
{
fz_pixmap *pix = userdata;
unsigned char *p;
if (x < pix->x)
{
alpha += pix->x - x;
n -= pix->x - x;
x = pix->x;
}
if (x + n > pix->x + pix->w)
n = pix->x + pix->w - x;
if (n < 0)
return;
p = pix->samples + (y - pix->y) * pix->w + (x - pix->x);
while (n--)
*p++ = *alpha++ * SF;
}
fz_error *
fz_rendercolorpath(fz_renderer *gc, fz_pathnode *path, fz_colornode *color, fz_matrix ctm)
{
fz_error *error;
float rgb[3];
fz_resetgel(gc->gel, HS, VS);
error = pathtogel(gc->gel, path, ctm);
if (error)
return error;
fz_sortgel(gc->gel);
fz_convertcolor(color->cs, color->samples, gc->model, rgb);
gc->r = rgb[0] * 255;
gc->g = rgb[1] * 255;
gc->b = rgb[2] * 255;
fz_scanconvert(gc->gel, gc->ael,
path->paint == FZ_EOFILL,
gc->clip.min.y, gc->clip.max.y,
blitcolorspan, gc);
return nil;
}
fz_error *
fz_renderpath(fz_renderer *gc, fz_pathnode *path, fz_matrix ctm)
{
fz_error *error;
fz_irect bbox;
fz_resetgel(gc->gel, HS, VS);
error = pathtogel(gc->gel, path, ctm);
if (error)
return error;
fz_sortgel(gc->gel);
bbox = fz_boundgel(gc->gel);
bbox = fz_intersectirects(bbox, gc->clip);
error = fz_newpixmap(&gc->tmp,
bbox.min.x, bbox.min.y,
bbox.max.x - bbox.min.x,
bbox.max.y - bbox.min.y, 1);
if (error)
return error;
fz_clearpixmap(gc->tmp);
fz_scanconvert(gc->gel, gc->ael,
path->paint == FZ_EOFILL,
gc->clip.min.y, gc->clip.max.y,
blitalphaspan, gc->tmp);
return nil;
}
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