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#include "fitz.h"
#define noLINEAR
typedef unsigned char byte;
static inline float roundup(float x)
{
return (x < 0) ? floorf(x) : ceilf(x);
}
#ifdef LINEAR
static inline int lerp(int a, int b, int t)
{
return a + (((b - a) * t) >> 16);
}
static inline int bilerp(int a, int b, int c, int d, int u, int v)
{
return lerp(lerp(a, b, u), lerp(c, d, u), v);
}
static inline byte *samplenearest(byte *s, int w, int h, int n, int u, int v)
{
if (u < 0) u = 0;
if (v < 0) v = 0;
if (u >= w) u = w - 1;
if (v >= h) v = h - 1;
return s + (v * w + u) * n;
}
#endif
/* Blend premultiplied source image in constant alpha over destination */
static inline void
fz_paintaffinealphaN(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha)
{
int k;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
#ifdef LINEAR
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = samplenearest(sp, sw, sh, n, ui, vi);
byte *b = samplenearest(sp, sw, sh, n, ui+1, vi);
byte *c = samplenearest(sp, sw, sh, n, ui, vi+1);
byte *d = samplenearest(sp, sw, sh, n, ui+1, vi+1);
int x = bilerp(a[n-1], b[n-1], c[n-1], d[n-1], uf, vf);
int t = 255 - fz_mul255(x, alpha);
for (k = 0; k < n; k++)
{
x = bilerp(a[k], b[k], c[k], d[k], uf, vf);
dp[k] = fz_mul255(x, alpha) + fz_mul255(dp[k], t);
}
#else
byte *sample = sp + ((vi * sw + ui) * n);
int t = 255 - fz_mul255(sample[n-1], alpha);
for (k = 0; k < n; k++)
dp[k] = fz_mul255(sample[k], alpha) + fz_mul255(dp[k], t);
#endif
}
dp += n;
u += fa;
v += fb;
}
}
/* Blend premultiplied source image over destination */
static inline void
fz_paintaffineN(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n)
{
int k;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
#ifdef LINEAR
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = samplenearest(sp, sw, sh, n, ui, vi);
byte *b = samplenearest(sp, sw, sh, n, ui+1, vi);
byte *c = samplenearest(sp, sw, sh, n, ui, vi+1);
byte *d = samplenearest(sp, sw, sh, n, ui+1, vi+1);
int t = 255 - bilerp(a[n-1], b[n-1], c[n-1], d[n-1], uf, vf);
for (k = 0; k < n; k++)
{
int x = bilerp(a[k], b[k], c[k], d[k], uf, vf);
dp[k] = x + fz_mul255(dp[k], t);
}
#else
byte *sample = sp + ((vi * sw + ui) * n);
int t = 255 - sample[n-1];
for (k = 0; k < n; k++)
dp[k] = sample[k] + fz_mul255(dp[k], t);
#endif
}
dp += n;
u += fa;
v += fb;
}
}
/* Blend non-premultiplied color in source image mask over destination */
static inline void
fz_paintaffinecolorN(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, byte *color)
{
int sa = color[n-1];
int k;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
#ifdef LINEAR
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = samplenearest(sp, sw, sh, 1, ui, vi);
byte *b = samplenearest(sp, sw, sh, 1, ui+1, vi);
byte *c = samplenearest(sp, sw, sh, 1, ui, vi+1);
byte *d = samplenearest(sp, sw, sh, 1, ui+1, vi+1);
int ma = bilerp(a[0], b[0], c[0], d[0], uf, vf);
#else
int ma = sp[vi * sw + ui];
#endif
int masa = FZ_COMBINE(FZ_EXPAND(ma), sa);
for (k = 0; k < n - 1; k++)
dp[k] = FZ_BLEND(color[k], dp[k], masa);
dp[k] = FZ_BLEND(255, dp[k], masa);
}
dp += n;
u += fa;
v += fb;
}
}
void
fz_paintaffine(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha)
{
if (alpha == 255)
{
switch (n)
{
case 1: fz_paintaffineN(dp, sp, sw, sh, u, v, fa, fb, w, 1); break;
case 2: fz_paintaffineN(dp, sp, sw, sh, u, v, fa, fb, w, 2); break;
case 4: fz_paintaffineN(dp, sp, sw, sh, u, v, fa, fb, w, 4); break;
default: fz_paintaffineN(dp, sp, sw, sh, u, v, fa, fb, w, n); break;
}
}
else if (alpha > 0)
{
switch (n)
{
case 1: fz_paintaffinealphaN(dp, sp, sw, sh, u, v, fa, fb, w, 1, alpha); break;
case 2: fz_paintaffinealphaN(dp, sp, sw, sh, u, v, fa, fb, w, 2, alpha); break;
case 4: fz_paintaffinealphaN(dp, sp, sw, sh, u, v, fa, fb, w, 4, alpha); break;
default: fz_paintaffinealphaN(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha); break;
}
}
}
void
fz_paintaffinecolor(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, byte *color)
{
switch (n)
{
case 2: fz_paintaffinecolorN(dp, sp, sw, sh, u, v, fa, fb, w, 2, color); break;
case 4: fz_paintaffinecolorN(dp, sp, sw, sh, u, v, fa, fb, w, 4, color); break;
default: fz_paintaffinecolorN(dp, sp, sw, sh, u, v, fa, fb, w, n, color); break;
}
}
/* Draw an image with an affine transform on destination */
static void
fz_paintimageimp(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *img, fz_matrix ctm, byte *color, int alpha)
{
byte *dp, *sp;
int u, v, fa, fb, fc, fd;
int x, y, w, h;
int sw, sh, n;
fz_matrix inv;
fz_bbox bbox;
/* grid fit the image */
if (fz_isrectilinear(ctm))
{
ctm.a = roundup(ctm.a);
ctm.b = roundup(ctm.b);
ctm.c = roundup(ctm.c);
ctm.d = roundup(ctm.d);
ctm.e = floorf(ctm.e);// + 0.5f;
ctm.f = floorf(ctm.f);// + 0.5f;
}
bbox = fz_roundrect(fz_transformrect(ctm, fz_unitrect));
bbox = fz_intersectbbox(bbox, scissor);
x = bbox.x0;
y = bbox.y0;
w = bbox.x1 - bbox.x0;
h = bbox.y1 - bbox.y0;
/* map from screen space (x,y) to image space (u,v) */
inv = fz_scale(1.0f / img->w, -1.0f / img->h);
inv = fz_concat(inv, fz_translate(0, 1));
inv = fz_concat(inv, ctm);
inv = fz_invertmatrix(inv);
fa = inv.a * 65536;
fb = inv.b * 65536;
fc = inv.c * 65536;
fd = inv.d * 65536;
/* Calculate initial texture positions. Do a half step to start. */
/* Also, convert from texture space to sample space (subtract 1/2) */
u = (fa * x) + (fc * y) + inv.e * 65536 + ((fa+fc)>>1) - 32768;
v = (fb * x) + (fd * y) + inv.f * 65536 + ((fb+fd)>>1) - 32768;
dp = dst->samples + ((y - dst->y) * dst->w + (x - dst->x)) * dst->n;
n = dst->n;
sp = img->samples;
sw = img->w;
sh = img->h;
/* TODO: if (fb == 0 && fa == 1) call fz_paintspan */
while (h--)
{
if (color)
fz_paintaffinecolor(dp, sp, sw, sh, u, v, fa, fb, w, n, color);
else
fz_paintaffine(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha);
dp += dst->w * n;
u += fc;
v += fd;
}
}
void
fz_paintimagecolor(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *img, fz_matrix ctm, byte *color)
{
assert(img->n == 1);
fz_paintimageimp(dst, scissor, img, ctm, color, 255);
}
void
fz_paintimage(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *img, fz_matrix ctm, int alpha)
{
assert(dst->n == img->n);
fz_paintimageimp(dst, scissor, img, ctm, nil, alpha);
}
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