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#include "fitz.h"
#include "mupdf.h"
/* ICCBased */
static fz_colorspace *
load_icc_based(pdf_document *xref, pdf_obj *dict)
{
int n;
n = pdf_to_int(pdf_dict_gets(dict, "N"));
switch (n)
{
case 1: return fz_device_gray;
case 3: return fz_device_rgb;
case 4: return fz_device_cmyk;
}
fz_throw(xref->ctx, "syntaxerror: ICCBased must have 1, 3 or 4 components");
return NULL; /* Stupid MSVC */
}
/* Lab */
static inline float fung(float x)
{
if (x >= 6.0f / 29.0f)
return x * x * x;
return (108.0f / 841.0f) * (x - (4.0f / 29.0f));
}
static void
lab_to_rgb(fz_context *ctx, fz_colorspace *cs, float *lab, float *rgb)
{
/* input is in range (0..100, -128..127, -128..127) not (0..1, 0..1, 0..1) */
float lstar, astar, bstar, l, m, n, x, y, z, r, g, b;
lstar = lab[0];
astar = lab[1];
bstar = lab[2];
m = (lstar + 16) / 116;
l = m + astar / 500;
n = m - bstar / 200;
x = fung(l);
y = fung(m);
z = fung(n);
r = (3.240449f * x + -1.537136f * y + -0.498531f * z) * 0.830026f;
g = (-0.969265f * x + 1.876011f * y + 0.041556f * z) * 1.05452f;
b = (0.055643f * x + -0.204026f * y + 1.057229f * z) * 1.1003f;
rgb[0] = sqrtf(CLAMP(r, 0, 1));
rgb[1] = sqrtf(CLAMP(g, 0, 1));
rgb[2] = sqrtf(CLAMP(b, 0, 1));
}
static void
rgb_to_lab(fz_context *ctx, fz_colorspace *cs, float *rgb, float *lab)
{
fz_warn(ctx, "cannot convert into L*a*b colorspace");
lab[0] = rgb[0];
lab[1] = rgb[1];
lab[2] = rgb[2];
}
static fz_colorspace k_device_lab = { {-1, fz_free_colorspace_imp}, 0, "Lab", 3, lab_to_rgb, rgb_to_lab };
static fz_colorspace *fz_device_lab = &k_device_lab;
/* Separation and DeviceN */
struct separation
{
fz_colorspace *base;
pdf_function *tint;
};
static void
separation_to_rgb(fz_context *ctx, fz_colorspace *cs, float *color, float *rgb)
{
struct separation *sep = cs->data;
float alt[FZ_MAX_COLORS];
pdf_eval_function(ctx, sep->tint, color, cs->n, alt, sep->base->n);
sep->base->to_rgb(ctx, sep->base, alt, rgb);
}
static void
free_separation(fz_context *ctx, fz_colorspace *cs)
{
struct separation *sep = cs->data;
fz_drop_colorspace(ctx, sep->base);
pdf_drop_function(ctx, sep->tint);
fz_free(ctx, sep);
}
static fz_colorspace *
load_separation(pdf_document *xref, pdf_obj *array)
{
fz_colorspace *cs;
struct separation *sep = NULL;
fz_context *ctx = xref->ctx;
pdf_obj *nameobj = pdf_array_get(array, 1);
pdf_obj *baseobj = pdf_array_get(array, 2);
pdf_obj *tintobj = pdf_array_get(array, 3);
fz_colorspace *base;
pdf_function *tint = NULL;
int n;
fz_var(tint);
fz_var(sep);
if (pdf_is_array(nameobj))
n = pdf_array_len(nameobj);
else
n = 1;
if (n > FZ_MAX_COLORS)
fz_throw(ctx, "too many components in colorspace");
base = pdf_load_colorspace(xref, baseobj);
/* RJW: "cannot load base colorspace (%d %d R)", pdf_to_num(baseobj), pdf_to_gen(baseobj) */
fz_try(ctx)
{
tint = pdf_load_function(xref, tintobj);
/* RJW: fz_drop_colorspace(ctx, base);
* "cannot load tint function (%d %d R)", pdf_to_num(tintobj), pdf_to_gen(tintobj) */
sep = fz_malloc_struct(ctx, struct separation);
sep->base = base;
sep->tint = tint;
cs = fz_new_colorspace(ctx, n == 1 ? "Separation" : "DeviceN", n);
cs->to_rgb = separation_to_rgb;
cs->free_data = free_separation;
cs->data = sep;
cs->size += sizeof(struct separation) + (base ? base->size : 0) + pdf_function_size(tint);
}
fz_catch(ctx)
{
fz_drop_colorspace(ctx, base);
pdf_drop_function(ctx, tint);
fz_free(ctx, sep);
fz_rethrow(ctx);
}
return cs;
}
/* Indexed */
struct indexed
{
fz_colorspace *base;
int high;
unsigned char *lookup;
};
static void
indexed_to_rgb(fz_context *ctx, fz_colorspace *cs, float *color, float *rgb)
{
struct indexed *idx = cs->data;
float alt[FZ_MAX_COLORS];
int i, k;
i = color[0] * 255;
i = CLAMP(i, 0, idx->high);
for (k = 0; k < idx->base->n; k++)
alt[k] = idx->lookup[i * idx->base->n + k] / 255.0f;
idx->base->to_rgb(ctx, idx->base, alt, rgb);
}
static void
free_indexed(fz_context *ctx, fz_colorspace *cs)
{
struct indexed *idx = cs->data;
if (idx->base)
fz_drop_colorspace(ctx, idx->base);
fz_free(ctx, idx->lookup);
fz_free(ctx, idx);
}
fz_pixmap *
pdf_expand_indexed_pixmap(fz_context *ctx, fz_pixmap *src)
{
struct indexed *idx;
fz_pixmap *dst;
unsigned char *s, *d;
int y, x, k, n, high;
unsigned char *lookup;
assert(src->colorspace->to_rgb == indexed_to_rgb);
assert(src->n == 2);
idx = src->colorspace->data;
high = idx->high;
lookup = idx->lookup;
n = idx->base->n;
dst = fz_new_pixmap_with_rect(ctx, idx->base, fz_bound_pixmap(src));
s = src->samples;
d = dst->samples;
for (y = 0; y < src->h; y++)
{
for (x = 0; x < src->w; x++)
{
int v = *s++;
int a = *s++;
v = MIN(v, high);
for (k = 0; k < n; k++)
*d++ = fz_mul255(lookup[v * n + k], a);
*d++ = a;
}
}
if (src->mask)
dst->mask = fz_keep_pixmap(ctx, src->mask);
dst->interpolate = src->interpolate;
return dst;
}
static fz_colorspace *
load_indexed(pdf_document *xref, pdf_obj *array)
{
struct indexed *idx = NULL;
fz_context *ctx = xref->ctx;
pdf_obj *baseobj = pdf_array_get(array, 1);
pdf_obj *highobj = pdf_array_get(array, 2);
pdf_obj *lookup = pdf_array_get(array, 3);
fz_colorspace *base = NULL;
fz_colorspace *cs = NULL;
int i, n;
fz_var(idx);
fz_var(base);
fz_var(cs);
fz_try(ctx)
{
base = pdf_load_colorspace(xref, baseobj);
/* "cannot load base colorspace (%d %d R)", pdf_to_num(baseobj), pdf_to_gen(baseobj) */
idx = fz_malloc_struct(ctx, struct indexed);
idx->lookup = NULL;
idx->base = base;
idx->high = pdf_to_int(highobj);
idx->high = CLAMP(idx->high, 0, 255);
n = base->n * (idx->high + 1);
idx->lookup = fz_malloc_array(ctx, 1, n);
cs = fz_new_colorspace(ctx, "Indexed", 1);
cs->to_rgb = indexed_to_rgb;
cs->free_data = free_indexed;
cs->data = idx;
cs->size += sizeof(*idx) + n + (base ? base->size : 0);
if (pdf_is_string(lookup) && pdf_to_str_len(lookup) == n)
{
unsigned char *buf = (unsigned char *) pdf_to_str_buf(lookup);
for (i = 0; i < n; i++)
idx->lookup[i] = buf[i];
}
else if (pdf_is_indirect(lookup))
{
fz_stream *file = NULL;
fz_try(ctx)
{
file = pdf_open_stream(xref, pdf_to_num(lookup), pdf_to_gen(lookup));
}
fz_catch(ctx)
{
fz_throw(ctx, "cannot open colorspace lookup table (%d 0 R)", pdf_to_num(lookup));
}
i = fz_read(file, idx->lookup, n);
if (i < 0)
{
fz_close(file);
fz_throw(ctx, "cannot read colorspace lookup table (%d 0 R)", pdf_to_num(lookup));
}
fz_close(file);
}
else
{
fz_throw(ctx, "cannot parse colorspace lookup table");
}
}
fz_catch(ctx)
{
if (cs == NULL || cs->data != idx)
{
fz_drop_colorspace(ctx, base);
if (idx)
fz_free(ctx, idx->lookup);
fz_free(ctx, idx);
}
fz_drop_colorspace(ctx, cs);
fz_rethrow(ctx);
}
return cs;
}
/* Parse and create colorspace from PDF object */
static fz_colorspace *
pdf_load_colorspace_imp(pdf_document *xref, pdf_obj *obj)
{
if (pdf_is_name(obj))
{
if (!strcmp(pdf_to_name(obj), "Pattern"))
return fz_device_gray;
else if (!strcmp(pdf_to_name(obj), "G"))
return fz_device_gray;
else if (!strcmp(pdf_to_name(obj), "RGB"))
return fz_device_rgb;
else if (!strcmp(pdf_to_name(obj), "CMYK"))
return fz_device_cmyk;
else if (!strcmp(pdf_to_name(obj), "DeviceGray"))
return fz_device_gray;
else if (!strcmp(pdf_to_name(obj), "DeviceRGB"))
return fz_device_rgb;
else if (!strcmp(pdf_to_name(obj), "DeviceCMYK"))
return fz_device_cmyk;
else
fz_throw(xref->ctx, "unknown colorspace: %s", pdf_to_name(obj));
}
else if (pdf_is_array(obj))
{
pdf_obj *name = pdf_array_get(obj, 0);
if (pdf_is_name(name))
{
/* load base colorspace instead */
if (!strcmp(pdf_to_name(name), "Pattern"))
{
obj = pdf_array_get(obj, 1);
if (!obj)
{
return fz_device_gray;
}
return pdf_load_colorspace(xref, obj);
/* RJW: "cannot load pattern (%d %d R)", pdf_to_num(obj), pdf_to_gen(obj) */
}
else if (!strcmp(pdf_to_name(name), "G"))
return fz_device_gray;
else if (!strcmp(pdf_to_name(name), "RGB"))
return fz_device_rgb;
else if (!strcmp(pdf_to_name(name), "CMYK"))
return fz_device_cmyk;
else if (!strcmp(pdf_to_name(name), "DeviceGray"))
return fz_device_gray;
else if (!strcmp(pdf_to_name(name), "DeviceRGB"))
return fz_device_rgb;
else if (!strcmp(pdf_to_name(name), "DeviceCMYK"))
return fz_device_cmyk;
else if (!strcmp(pdf_to_name(name), "CalGray"))
return fz_device_gray;
else if (!strcmp(pdf_to_name(name), "CalRGB"))
return fz_device_rgb;
else if (!strcmp(pdf_to_name(name), "CalCMYK"))
return fz_device_cmyk;
else if (!strcmp(pdf_to_name(name), "Lab"))
return fz_device_lab;
else if (!strcmp(pdf_to_name(name), "ICCBased"))
return load_icc_based(xref, pdf_array_get(obj, 1));
else if (!strcmp(pdf_to_name(name), "Indexed"))
return load_indexed(xref, obj);
else if (!strcmp(pdf_to_name(name), "I"))
return load_indexed(xref, obj);
else if (!strcmp(pdf_to_name(name), "Separation"))
return load_separation(xref, obj);
else if (!strcmp(pdf_to_name(name), "DeviceN"))
return load_separation(xref, obj);
else
fz_throw(xref->ctx, "syntaxerror: unknown colorspace %s", pdf_to_name(name));
}
}
fz_throw(xref->ctx, "syntaxerror: could not parse color space (%d %d R)", pdf_to_num(obj), pdf_to_gen(obj));
return NULL; /* Stupid MSVC */
}
fz_colorspace *
pdf_load_colorspace(pdf_document *xref, pdf_obj *obj)
{
fz_context *ctx = xref->ctx;
fz_colorspace *cs;
if ((cs = pdf_find_item(ctx, fz_free_colorspace_imp, obj)))
{
return cs;
}
cs = pdf_load_colorspace_imp(xref, obj);
/* RJW: "cannot load colorspace (%d %d R)", pdf_to_num(obj), pdf_to_gen(obj) */
pdf_store_item(ctx, obj, cs, cs->size);
return cs;
}
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