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#include <fitz.h>
#define GAMMA 1.8
void fz_gammapixmap(fz_pixmap *pix, float gamma);
#define LERP(a,b,t) (a + (((b - a) * t) >> 16))
static inline int getcomp(fz_pixmap *pix, int u, int v, int k)
{
if (u < 0 || u >= pix->w)
return 0;
if (v < 0 || v >= pix->h)
return 0;
return pix->samples[ (v * pix->w + u) * pix->n + k ];
}
static inline int sampleimage(fz_pixmap *pix, int u, int v, int k)
{
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFFFF;
int vd = v & 0xFFFF;
int a = getcomp(pix, ui, vi, k);
int b = getcomp(pix, ui + 1, vi, k);
int c = getcomp(pix, ui, vi + 1, k);
int d = getcomp(pix, ui + 1, vi + 1, k);
int ab = LERP(a, b, ud);
int cd = LERP(c, d, ud);
return LERP(ab, cd, vd);
}
static inline void
drawscan(fz_matrix *invmat, fz_pixmap *dst, fz_pixmap *src, int y, int x0, int x1)
{
unsigned char *d;
int k, n;
int u = (invmat->a * x0 + invmat->c * y + invmat->e) * 65536;
int v = (invmat->b * x0 + invmat->d * y + invmat->f) * 65536;
int du = invmat->a * 65536;
int dv = invmat->b * 65536;
n = x1 - x0;
d = dst->samples + ((y - dst->y) * dst->w + (x0 - dst->x)) * dst->n;
while (n--)
{
for (k = 0; k < src->n; k++)
*d++ = sampleimage(src, u, v, k);
u += du;
v += dv;
}
}
static inline void
overscanrgb(fz_matrix *invmat, fz_pixmap *dst, fz_pixmap *src, int y, int x0, int x1)
{
int x;
int u = (invmat->a * x0 + invmat->c * y + invmat->e) * 65536;
int v = (invmat->b * x0 + invmat->d * y + invmat->f) * 65536;
int du = invmat->a * 65536;
int dv = invmat->b * 65536;
for (x = x0; x < x1; x++)
{
int sa = sampleimage(src, u, v, 0);
int sr = sampleimage(src, u, v, 1);
int sg = sampleimage(src, u, v, 2);
int sb = sampleimage(src, u, v, 3);
int da = dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 0 ];
int dr = dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 1 ];
int dg = dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 2 ];
int db = dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 3 ];
int ssa = 255 - sa;
da = sa + fz_mul255(da, ssa);
dr = sr + fz_mul255(dr, ssa);
dg = sg + fz_mul255(dg, ssa);
db = sb + fz_mul255(db, ssa);
dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 0 ] = da;
dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 1 ] = dr;
dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 2 ] = dg;
dst->samples[ ((y-dst->y) * dst->w + x-dst->x) * dst->n + 3 ] = db;
u += du;
v += dv;
}
}
static fz_error *
drawtile(fz_renderer *gc, fz_pixmap *out, fz_pixmap *tile, fz_matrix ctm, int over)
{
static const fz_point rect[4] = { {0, 0}, {0, 1}, {1, 1}, {1, 0} };
fz_matrix imgmat;
fz_matrix invmat;
fz_point v[4];
int top, bot, x0, x1, y;
int i;
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]);
top = fz_floor(MIN4(v[0].y, v[1].y, v[2].y, v[3].y)) - 1;
bot = fz_ceil(MAX4(v[0].y, v[1].y, v[2].y, v[3].y)) + 1;
x0 = fz_floor(MIN4(v[0].x, v[1].x, v[2].x, v[3].x)) - 1;
x1 = fz_ceil(MAX4(v[0].x, v[1].x, v[2].x, v[3].x)) + 1;
top = CLAMP(top, out->y, out->y + out->h - 1);
bot = CLAMP(bot, out->y, out->y + out->h - 1);
x0 = CLAMP(x0, out->x, out->x + out->w - 1);
x1 = CLAMP(x1, out->x, out->x + out->w - 1);
for (y = top; y <= bot; y++)
{
if (over && tile->n == 4)
overscanrgb(&invmat, out, tile, y, x0, x1 + 1);
else
drawscan(&invmat, out, tile, y, x0, x1 + 1);
}
return nil;
}
fz_error *
fz_renderimage(fz_renderer *gc, fz_imagenode *node, fz_matrix ctm)
{
fz_error *error;
fz_pixmap *tile1;
fz_pixmap *tile2;
fz_pixmap *tile3;
fz_image *image = node->image;
fz_colorspace *cs = image->cs;
int w = image->w;
int h = image->h;
int n = image->n;
int a = image->a;
float sx = sqrt(ctm.a * ctm.a + ctm.b * ctm.b);
float sy = sqrt(ctm.c * ctm.c + ctm.d * ctm.d);
int dx = 1;
while ( ( (w + dx - 1) / dx ) / sx > 2.0 && (w+dx-1)/dx > 1)
dx++;
int dy = 1;
while ( ( (h + dy - 1) / dy ) / sy > 2.0 && (h+dy-1)/dy > 1)
dy++;
printf("renderimage s=%gx%g/%dx%d d=%d,%d\n", sx, sy, w, h, dx, dy);
error = fz_newpixmap(&tile1, 0, 0, w, h, n + 1);
printf(" load tile %d x %d\n", w, h);
error = image->loadtile(image, tile1);
//fz_debugpixmap(tile1);getchar();
if (dx != 1 || dy != 1)
{
printf(" scale tile 1/%d x 1/%d\n", dx, dy);
// fz_gammapixmap(tile1, 1.0 / GAMMA);
error = fz_scalepixmap(&tile2, tile1, dx, dy);
// fz_gammapixmap(tile2, GAMMA);
fz_droppixmap(tile1);
}
else
tile2 = tile1;
/* render image mask */
if (n == 0 && a == 1)
{
printf(" draw image mask\n");
error = fz_newpixmap(&gc->tmp, gc->x, gc->y, gc->w, gc->h, 1);
fz_clearpixmap(gc->tmp);
error = drawtile(gc, gc->tmp, tile2, ctm, 0);
}
/* render rgb over */
else if (gc->acc)
{
if (n == 3 && a == 0)
{
printf(" draw image rgb over\n");
error = drawtile(gc, gc->acc, tile2, ctm, 1);
}
/* render generic image */
else
{
printf(" draw image rgb over after cs transform\n");
error = fz_newpixmap(&tile3, tile2->x, tile2->y, tile2->w, tile2->h, gc->model->n + 1);
fz_convertpixmap(cs, tile2, gc->model, tile3);
error = drawtile(gc, gc->acc, tile3, ctm, 1);
fz_droppixmap(tile3);
}
}
/* render generic image */
else
{
printf(" draw image after cs transform\n");
error = fz_newpixmap(&tile3, tile2->x, tile2->y, tile2->w, tile2->h, gc->model->n + 1);
fz_convertpixmap(cs, tile2, gc->model, tile3);
fz_rect bbox = fz_boundnode((fz_node*)node, ctm);
fz_irect aabb;
aabb.min.x = fz_floor(bbox.min.x) - 1;
aabb.min.y = fz_floor(bbox.min.y) - 1;
aabb.max.x = fz_ceil(bbox.max.x) + 1;
aabb.max.y = fz_ceil(bbox.max.y) + 1;
aabb = fz_intersectirects(aabb, (fz_irect){{gc->x,gc->y},{gc->x+gc->w,gc->y+gc->h}});
error = fz_newpixmap(&gc->tmp,
aabb.min.x, aabb.min.y,
aabb.max.x - aabb.min.x, aabb.max.y - aabb.min.y,
gc->model->n + 1);
fz_clearpixmap(gc->tmp);
error = drawtile(gc, gc->tmp, tile3, ctm, 0);
fz_droppixmap(tile3);
}
fz_droppixmap(tile2);
return nil;
}
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