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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;
}
void
fz_freepixmap(fz_pixmap *pix)
{
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;
FILE *f = fopen("out.ppm", "w");
if (pix->n == 3 && pix->a == 1)
{
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;
int a = (pix->samples[x * 4 + y * pix->stride + 3] * 255) >> 14;
putc(((r * a) / 255) + (255 - a), f);
putc(((g * a) / 255) + (255 - a), f);
putc(((b * a) / 255) + (255 - a), f);
// putc(a, f);
// putc(a, f);
// putc(a, f);
}
}
else if (pix->n == 0 && pix->a == 1)
{
fprintf(f, "P5\n%d %d\n255\n", pix->w, pix->h);
for (y = 0; y < pix->h; y++)
for (x = 0; x < pix->w; x++)
{
int a = (pix->samples[x + y * pix->stride] * 255) >> 14;
putc(a, f);
}
}
fclose(f);
}
void
fz_blendover(fz_pixmap *src, fz_pixmap *dst)
{
int x, y, k;
assert(dst->n == src->n);
assert(dst->a == 1);
assert(src->n == 3);
assert(src->a == 1);
for (y = 0; y < dst->h; y++)
{
short *s = &src->samples[y * src->stride];
short *d = &dst->samples[y * dst->stride];
for (x = 0; x < dst->w; x++)
{
int sa = s[3];
int ssa = (1 << 14) - sa;
d[0] = ((s[0] * sa) >> 14) + ((d[0] * ssa) >> 14);
d[1] = ((s[1] * sa) >> 14) + ((d[1] * ssa) >> 14);
d[2] = ((s[2] * sa) >> 14) + ((d[2] * ssa) >> 14);
d[3] = sa + ((ssa * d[3]) >> 14);
s += 4;
d += 4;
}
}
}
void
fz_blendmask(fz_pixmap *dst, fz_pixmap *src, fz_pixmap *msk)
{
int x, y, k;
assert(src->n == dst->n);
assert(src->a == 1);
assert(msk->n == 0);
assert(msk->a == 1);
assert(dst->a == 1);
for (y = 0; y < dst->h; y++)
{
short *d = &dst->samples[y * dst->stride];
short *s = &src->samples[y * src->stride];
short *m = &msk->samples[y * msk->stride];
for (x = 0; x < dst->w; x++)
{
for (k = 0; k < dst->n; k++)
*d++ = *s++;
*d++ = (*m++ * *s++) >> 14;
}
}
}
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