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#include <fitz.h>
static void blitalphaglyph(fz_pixmap *out, fz_glyph *gl, int xo, int yo)
{
int sx, sy, dx, dy, a, b, c;
for (sy = 0; sy < gl->h; sy++)
{
for (sx = 0; sx < gl->w; sx++)
{
dx = xo + sx + gl->lsb - out->x;
dy = yo - sy + gl->top - out->y;
if (dx < 0) continue;
if (dy < 0) continue;
if (dx >= out->w) continue;
if (dy >= out->h) continue;
a = gl->bitmap[sx + sy * gl->w];
b = out->samples[dx + dy * out->w];
c = a + fz_mul255(b, 255 - a);
out->samples[dx + dy * out->w] = c;
}
}
}
static void blitcolorglyph(fz_pixmap *out, fz_glyph *gl, int xo, int yo, fz_renderer *gc)
{
int sx, sy, dx, dy, sa, ssa;
unsigned char *p;
for (sy = 0; sy < gl->h; sy++)
{
for (sx = 0; sx < gl->w; sx++)
{
dy = yo - sy + gl->top - out->y;
if (dy < 0) continue;
if (dy >= out->h) break;
dx = xo + sx + gl->lsb - out->x;
if (dx < 0) continue;
if (dx >= out->w) break;
sa = gl->bitmap[sx + sy * gl->w];
ssa = 255 - sa;
p = out->samples + dx * 4 + dy * out->w * out->n;
p[0] = sa + fz_mul255(ssa, p[0]);
p[1] = fz_mul255(gc->r, sa) + fz_mul255(p[1], ssa);
p[2] = fz_mul255(gc->g, sa) + fz_mul255(p[2], ssa);
p[3] = fz_mul255(gc->b, sa) + fz_mul255(p[3], ssa);
}
}
}
fz_error *
fz_rendertext(fz_renderer *gc, fz_textnode *text, fz_matrix ctm)
{
fz_error *error;
fz_glyph gl;
float x, y;
int g, i, ix, iy;
fz_matrix tm, trm;
error = fz_newpixmap(&gc->tmp, gc->x, gc->y, gc->w, gc->h, 1);
if (error)
return error;
tm = text->trm;
for (i = 0; i < text->len; i++)
{
g = text->els[i].cid;
x = text->els[i].x;
y = text->els[i].y;
tm.e = x;
tm.f = y;
trm = fz_concat(tm, ctm);
ix = fz_floor(trm.e);
iy = fz_floor(trm.f);
trm.e = (trm.e - fz_floor(trm.e));
trm.f = (trm.f - fz_floor(trm.f));
error = fz_renderglyph(gc->cache, &gl, text->font, g, trm);
if (error)
return error;
blitalphaglyph(gc->tmp, &gl, ix, iy);
}
return nil;
}
fz_error *
fz_rendercolortext(fz_renderer *gc, fz_textnode *text, fz_colornode *color, fz_matrix ctm)
{
fz_error *error;
fz_glyph gl;
float x, y;
int g, i, ix, iy;
fz_matrix tm, trm;
float rgb[3];
fz_convertcolor(color->cs, color->samples, gc->model, rgb);
gc->r = rgb[0] * 255;
gc->g = rgb[1] * 255;
gc->b = rgb[2] * 255;
tm = text->trm;
for (i = 0; i < text->len; i++)
{
g = text->els[i].cid;
x = text->els[i].x;
y = text->els[i].y;
tm.e = x;
tm.f = y;
trm = fz_concat(tm, ctm);
ix = fz_floor(trm.e);
iy = fz_floor(trm.f);
trm.e = (trm.e - fz_floor(trm.e));
trm.f = (trm.f - fz_floor(trm.f));
error = fz_renderglyph(gc->cache, &gl, text->font, g, trm);
if (error)
return error;
blitcolorglyph(gc->acc, &gl, ix, iy, gc);
}
return nil;
}
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