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#include <fitz.h>
fz_error *
fz_newpixmap(fz_pixmap **pixp, int x, int y, int w, int h, int n, int a)
{
fz_pixmap *pix;
pix = *pixp = fz_malloc(sizeof (fz_pixmap));
if (!pix)
return fz_outofmem;
pix->x = x;
pix->y = y;
pix->w = w;
pix->h = h;
pix->n = n;
pix->a = a;
pix->cs = nil;
pix->stride = (pix->n + pix->a) * pix->w;
pix->samples = fz_malloc(sizeof(short) * pix->stride * pix->h);
if (!pix->samples) {
fz_free(pix);
return fz_outofmem;
}
memset(pix->samples, 0, sizeof(short) * pix->stride * pix->h);
return nil;
}
fz_pixmap *
fz_keeppixmap(fz_pixmap *pix)
{
pix->refcount ++;
return pix;
}
void
fz_droppixmap(fz_pixmap *pix)
{
pix->refcount --;
if (pix->refcount == 0)
{
fz_free(pix->samples);
fz_free(pix);
}
}
void
fz_clearpixmap(fz_pixmap *pix)
{
memset(pix->samples, 0, sizeof(short) * pix->stride * pix->h);
}
void
fz_debugpixmap(fz_pixmap *pix)
{
int x, y;
assert(pix->n == 3 && pix->a == 1);
FILE *f = fopen("out.ppm", "w");
fprintf(f, "P6\n%d %d\n255\n", pix->w, pix->h);
for (y = 0; y < pix->h; y++)
for (x = 0; x < pix->w; x++)
{
int r = (pix->samples[x * 4 + y * pix->stride + 0] * 255) >> 14;
int g = (pix->samples[x * 4 + y * pix->stride + 1] * 255) >> 14;
int b = (pix->samples[x * 4 + y * pix->stride + 2] * 255) >> 14;
putc(r, f);
putc(g, f);
putc(b, f);
}
fclose(f);
}
void
fz_blendover(fz_pixmap *dst, fz_pixmap *fg, fz_pixmap *bg)
{
int x, y;
printf("dst=%d,%d fg=%d,%d bg=%d,%d\n",
dst->n, dst->a,
fg->n, fg->a,
bg->n, bg->a);
assert(fg->n == bg->n);
assert(fg->n == 3);
assert(fg->a == 1);
assert(bg->a == 1);
for (y = 0; y < dst->h; y++)
{
short *bgp = &fg->samples[y * fg->stride];
short *fgp = &bg->samples[y * bg->stride];
short *dstp = &dst->samples[y * dst->stride];
for (x = 0; x < dst->w; x++)
{
dstp[0] = ((fgp[3] * (fgp[0] - bgp[0])) >> 14) + bgp[0];
dstp[1] = ((fgp[3] * (fgp[1] - bgp[1])) >> 14) + bgp[1];
dstp[2] = ((fgp[3] * (fgp[2] - bgp[2])) >> 14) + bgp[2];
dstp[3] = ((fgp[3] * (fgp[3] - bgp[3])) >> 14) + bgp[3];
dstp += 4;
fgp += 4;
bgp += 4;
}
}
}
void
fz_blendmask(fz_pixmap *dst, fz_pixmap *src, fz_pixmap *mask)
{
int x, y, k;
assert(src->n == dst->n);
assert(src->a == 0);
assert(mask->n == 0);
assert(mask->a == 1);
assert(dst->a == 1);
for (y = 0; y < dst->h; y++)
{
short *dstp = &dst->samples[y * dst->stride];
short *srcp = &src->samples[y * src->stride];
short *mskp = &mask->samples[y * mask->stride];
for (x = 0; x < dst->w; x++)
{
for (k = 0; k < dst->n; k++)
*dstp++ = *srcp++;
*dstp++ = *mskp++;
}
}
}
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