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#include <fitz.h>
static inline void
drawscan(fz_matrix *invmat, fz_pixmap *dst, fz_pixmap *src, int y, int x0, int x1)
{
int x, k;
float u, v;
float du, dv;
fz_point p;
int iu, iv;
unsigned char c;
p.x = x0;
p.y = y;
p = fz_transformpoint(*invmat, p);
u = p.x;
v = p.y;
du = invmat->a;
dv = invmat->c;
for (x = x0; x < x1; x++)
{
iu = CLAMP((int)u, 0, src->w - 1);
iv = CLAMP((int)v, 0, src->h - 1);
for (k = 0; k < src->n + src->a; k++)
{
c = src->samples[ iv * src->stride + iu * (src->n+src->a) + k];
dst->samples[ y * dst->stride + x * (dst->n+dst->a) + k ] = c;
}
u += du;
v += dv;
}
}
static fz_error *
drawtile(fz_renderer *gc, fz_pixmap *out, fz_pixmap *tile, fz_matrix ctm)
{
static const fz_point rect[4] = { {0, 0}, {0, 1}, {1, 1}, {1, 0} };
fz_error *error;
fz_gel *gel = gc->gel;
fz_ael *ael = gc->ael;
fz_matrix imgmat;
fz_matrix invmat;
fz_point v[4];
int i, e, y, x0, x1;
imgmat.a = 1.0 / tile->w;
imgmat.b = 0.0;
imgmat.c = 0.0;
imgmat.d = -1.0 / tile->h;
imgmat.e = 0.0;
imgmat.f = 1.0;
invmat = fz_invertmatrix(fz_concat(imgmat, ctm));
for (i = 0; i < 4; i++)
v[i] = fz_transformpoint(ctm, rect[i]);
fz_resetgel(gel, 1, 1);
fz_insertgel(gel, v[0].x, v[0].y, v[1].x, v[1].y);
fz_insertgel(gel, v[1].x, v[1].y, v[2].x, v[2].y);
fz_insertgel(gel, v[2].x, v[2].y, v[3].x, v[3].y);
fz_insertgel(gel, v[3].x, v[3].y, v[0].x, v[0].y);
fz_sortgel(gel);
e = 0;
y = gel->edges[0].y;
while (ael->len > 0 || e < gel->len)
{
error = fz_insertael(ael, gel, y, &e);
if (error)
return error;
x0 = ael->edges[0]->x;
x1 = ael->edges[ael->len - 1]->x;
drawscan(&invmat, out, tile, y, x0, x1);
fz_advanceael(ael);
if (ael->len > 0)
y ++;
else if (e < gel->len)
y = gel->edges[e].y;
}
return nil;
}
fz_error *
fz_renderimage(fz_renderer *gc, fz_imagenode *node, fz_matrix ctm)
{
fz_error *error;
fz_pixmap *tile;
fz_image *image = node->image;
fz_colorspace *cs = image->cs;
int w = image->w;
int h = image->h;
int n = image->n;
error = fz_newpixmap(&tile, cs, 0, 0, w, h, n, 1);
if (error)
return error;
error = fz_newpixmap(&gc->tmp, cs, gc->x, gc->y, gc->w, gc->h, n, 1);
if (error)
goto cleanup;
fz_clearpixmap(gc->tmp);
error = image->loadtile(image, tile);
if (error)
goto cleanup;
error = drawtile(gc, gc->tmp, tile, ctm);
if (error)
goto cleanup;
printf("loadtile "); fz_debugpixmap(tile); getchar();
//printf("drawtile "); fz_debugpixmap(gc->tmp); getchar();
fz_freepixmap(tile);
return nil;
cleanup:
fz_freepixmap(tile);
return error;
}
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