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transform.c
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transform.c
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// qcms
// Copyright (C) 2009 Mozilla Corporation
// Copyright (C) 1998-2007 Marti Maria
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include "qcmsint.h"
/* for MSVC, GCC, Intel, and Sun compilers */
#if defined(_M_IX86) || defined(__i386__) || defined(__i386) || defined(_M_AMD64) || defined(__x86_64__) || defined(__x86_64)
#define X86
#endif /* _M_IX86 || __i386__ || __i386 || _M_AMD64 || __x86_64__ || __x86_64 */
//XXX: could use a bettername
typedef uint16_t uint16_fract_t;
/* value must be a value between 0 and 1 */
//XXX: is the above a good restriction to have?
float lut_interp_linear(double value, uint16_t *table, int length)
{
int upper, lower;
value = value * (length - 1); // scale to length of the array
upper = ceil(value);
lower = floor(value);
//XXX: can we be more performant here?
value = table[upper]*(1. - (upper - value)) + table[lower]*(upper - value);
/* scale the value */
return value * (1./65535.);
}
/* same as above but takes and returns a uint16_t value representing a range from 0..1 */
uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length)
{
/* Start scaling input_value to the length of the array: 65535*(length-1).
* We'll divide out the 65535 next */
uint32_t value = (input_value * (length - 1));
uint32_t upper = (value + 65534) / 65535; /* equivalent to ceil(value/65535) */
uint32_t lower = value / 65535; /* equivalent to floor(value/65535) */
/* interp is the distance from upper to value scaled to 0..65535 */
uint32_t interp = value % 65535;
value = (table[upper]*(interp) + table[lower]*(65535 - interp))/65535; // 0..65535*65535
return value;
}
/* same as above but takes an input_value from 0..PRECACHE_OUTPUT_MAX
* and returns a uint8_t value representing a range from 0..1 */
static
uint8_t lut_interp_linear_precache_output(uint32_t input_value, uint16_t *table, int length)
{
/* Start scaling input_value to the length of the array: PRECACHE_OUTPUT_MAX*(length-1).
* We'll divide out the PRECACHE_OUTPUT_MAX next */
uint32_t value = (input_value * (length - 1));
/* equivalent to ceil(value/PRECACHE_OUTPUT_MAX) */
uint32_t upper = (value + PRECACHE_OUTPUT_MAX-1) / PRECACHE_OUTPUT_MAX;
/* equivalent to floor(value/PRECACHE_OUTPUT_MAX) */
uint32_t lower = value / PRECACHE_OUTPUT_MAX;
/* interp is the distance from upper to value scaled to 0..PRECACHE_OUTPUT_MAX */
uint32_t interp = value % PRECACHE_OUTPUT_MAX;
/* the table values range from 0..65535 */
value = (table[upper]*(interp) + table[lower]*(PRECACHE_OUTPUT_MAX - interp)); // 0..(65535*PRECACHE_OUTPUT_MAX)
/* round and scale */
value += (PRECACHE_OUTPUT_MAX*65535/255)/2;
value /= (PRECACHE_OUTPUT_MAX*65535/255); // scale to 0..255
return value;
}
#if 0
/* if we use a different representation i.e. one that goes from 0 to 0x1000 we can be more efficient
* because we can avoid the divisions and use a shifting instead */
/* same as above but takes and returns a uint16_t value representing a range from 0..1 */
uint16_t lut_interp_linear16(uint16_t input_value, uint16_t *table, int length)
{
uint32_t value = (input_value * (length - 1));
uint32_t upper = (value + 4095) / 4096; /* equivalent to ceil(value/4096) */
uint32_t lower = value / 4096; /* equivalent to floor(value/4096) */
uint32_t interp = value % 4096;
value = (table[upper]*(interp) + table[lower]*(4096 - interp))/4096; // 0..4096*4096
return value;
}
#endif
void compute_curve_gamma_table_type1(float gamma_table[256], double gamma)
{
unsigned int i;
for (i = 0; i < 256; i++) {
gamma_table[i] = pow(i/255., gamma);
}
}
void compute_curve_gamma_table_type2(float gamma_table[256], uint16_t *table, int length)
{
unsigned int i;
for (i = 0; i < 256; i++) {
gamma_table[i] = lut_interp_linear(i/255., table, length);
}
}
void compute_curve_gamma_table_type0(float gamma_table[256])
{
unsigned int i;
for (i = 0; i < 256; i++) {
gamma_table[i] = i/255.;
}
}
unsigned char clamp_u8(float v)
{
if (v > 255.)
return 255;
else if (v < 0)
return 0;
else
return floor(v+.5);
}
struct vector {
float v[3];
};
struct matrix {
float m[3][3];
bool invalid;
};
struct vector matrix_eval(struct matrix mat, struct vector v)
{
struct vector result;
result.v[0] = mat.m[0][0]*v.v[0] + mat.m[0][1]*v.v[1] + mat.m[0][2]*v.v[2];
result.v[1] = mat.m[1][0]*v.v[0] + mat.m[1][1]*v.v[1] + mat.m[1][2]*v.v[2];
result.v[2] = mat.m[2][0]*v.v[0] + mat.m[2][1]*v.v[1] + mat.m[2][2]*v.v[2];
return result;
}
//XXX: should probably pass by reference and we could
//probably reuse this computation in matrix_invert
float matrix_det(struct matrix mat)
{
float det;
det = mat.m[0][0]*mat.m[1][1]*mat.m[2][2] +
mat.m[0][1]*mat.m[1][2]*mat.m[2][0] +
mat.m[0][2]*mat.m[1][0]*mat.m[2][1] -
mat.m[0][0]*mat.m[1][2]*mat.m[2][1] -
mat.m[0][1]*mat.m[1][0]*mat.m[2][2] -
mat.m[0][2]*mat.m[1][1]*mat.m[2][0];
return det;
}
/* from pixman and cairo and Mathematics for Game Programmers */
/* lcms uses gauss-jordan elimination with partial pivoting which is
* less efficient and not as numerically stable. See Mathematics for
* Game Programmers. */
struct matrix matrix_invert(struct matrix mat)
{
struct matrix dest_mat;
int i,j;
static int a[3] = { 2, 2, 1 };
static int b[3] = { 1, 0, 0 };
/* inv (A) = 1/det (A) * adj (A) */
float det = matrix_det(mat);
if (det == 0) {
dest_mat.invalid = true;
} else {
dest_mat.invalid = false;
}
det = 1/det;
for (j = 0; j < 3; j++) {
for (i = 0; i < 3; i++) {
double p;
int ai = a[i];
int aj = a[j];
int bi = b[i];
int bj = b[j];
p = mat.m[ai][aj] * mat.m[bi][bj] -
mat.m[ai][bj] * mat.m[bi][aj];
if (((i + j) & 1) != 0)
p = -p;
dest_mat.m[j][i] = det * p;
}
}
return dest_mat;
}
struct matrix matrix_identity(void)
{
struct matrix i;
i.m[0][0] = 1;
i.m[0][1] = 0;
i.m[0][2] = 0;
i.m[1][0] = 0;
i.m[1][1] = 1;
i.m[1][2] = 0;
i.m[2][0] = 0;
i.m[2][1] = 0;
i.m[2][2] = 1;
i.invalid = false;
return i;
}
static struct matrix matrix_invalid(void)
{
struct matrix inv = matrix_identity();
inv.invalid = true;
return inv;
}
/* from pixman */
/* MAT3per... */
struct matrix matrix_multiply(struct matrix a, struct matrix b)
{
struct matrix result;
int dx, dy;
int o;
for (dy = 0; dy < 3; dy++) {
for (dx = 0; dx < 3; dx++) {
double v = 0;
for (o = 0; o < 3; o++) {
v += a.m[dy][o] * b.m[o][dx];
}
result.m[dy][dx] = v;
}
}
result.invalid = a.invalid || b.invalid;
return result;
}
float u8Fixed8Number_to_float(uint16_t x)
{
// 0x0000 = 0.
// 0x0100 = 1.
// 0xffff = 255 + 255/256
return x/256.;
}
float *build_input_gamma_table(struct curveType *TRC)
{
float *gamma_table = malloc(sizeof(float)*256);
if (gamma_table) {
if (TRC->count == 0) {
compute_curve_gamma_table_type0(gamma_table);
} else if (TRC->count == 1) {
compute_curve_gamma_table_type1(gamma_table, u8Fixed8Number_to_float(TRC->data[0]));
} else {
compute_curve_gamma_table_type2(gamma_table, TRC->data, TRC->count);
}
}
return gamma_table;
}
struct matrix build_colorant_matrix(qcms_profile *p)
{
struct matrix result;
result.m[0][0] = s15Fixed16Number_to_float(p->redColorant.X);
result.m[0][1] = s15Fixed16Number_to_float(p->greenColorant.X);
result.m[0][2] = s15Fixed16Number_to_float(p->blueColorant.X);
result.m[1][0] = s15Fixed16Number_to_float(p->redColorant.Y);
result.m[1][1] = s15Fixed16Number_to_float(p->greenColorant.Y);
result.m[1][2] = s15Fixed16Number_to_float(p->blueColorant.Y);
result.m[2][0] = s15Fixed16Number_to_float(p->redColorant.Z);
result.m[2][1] = s15Fixed16Number_to_float(p->greenColorant.Z);
result.m[2][2] = s15Fixed16Number_to_float(p->blueColorant.Z);
result.invalid = false;
return result;
}
/* The following code is copied nearly directly from lcms.
* I think it could be much better. For example, Argyll seems to have better code in
* icmTable_lookup_bwd and icmTable_setup_bwd. However, for now this is a quick way
* to a working solution and allows for easy comparing with lcms. */
uint16_fract_t lut_inverse_interp16(uint16_t Value, uint16_t LutTable[], int length)
{
int l = 1;
int r = 0x10000;
int x = 0, res; // 'int' Give spacing for negative values
int NumZeroes, NumPoles;
int cell0, cell1;
double val2;
double y0, y1, x0, x1;
double a, b, f;
// July/27 2001 - Expanded to handle degenerated curves with an arbitrary
// number of elements containing 0 at the begining of the table (Zeroes)
// and another arbitrary number of poles (FFFFh) at the end.
// First the zero and pole extents are computed, then value is compared.
NumZeroes = 0;
while (LutTable[NumZeroes] == 0 && NumZeroes < length-1)
NumZeroes++;
// There are no zeros at the beginning and we are trying to find a zero, so
// return anything. It seems zero would be the less destructive choice
/* I'm not sure that this makes sense, but oh well... */
if (NumZeroes == 0 && Value == 0)
return 0;
NumPoles = 0;
while (LutTable[length-1- NumPoles] == 0xFFFF && NumPoles < length-1)
NumPoles++;
// Does the curve belong to this case?
if (NumZeroes > 1 || NumPoles > 1)
{
int a, b;
// Identify if value fall downto 0 or FFFF zone
if (Value == 0) return 0;
// if (Value == 0xFFFF) return 0xFFFF;
// else restrict to valid zone
a = ((NumZeroes-1) * 0xFFFF) / (length-1);
b = ((length-1 - NumPoles) * 0xFFFF) / (length-1);
l = a - 1;
r = b + 1;
}
// Seems not a degenerated case... apply binary search
while (r > l) {
x = (l + r) / 2;
res = (int) lut_interp_linear16((uint16_fract_t) (x-1), LutTable, length);
if (res == Value) {
// Found exact match.
return (uint16_fract_t) (x - 1);
}
if (res > Value) r = x - 1;
else l = x + 1;
}
// Not found, should we interpolate?
// Get surrounding nodes
val2 = (length-1) * ((double) (x - 1) / 65535.0);
cell0 = (int) floor(val2);
cell1 = (int) ceil(val2);
if (cell0 == cell1) return (uint16_fract_t) x;
y0 = LutTable[cell0] ;
x0 = (65535.0 * cell0) / (length-1);
y1 = LutTable[cell1] ;
x1 = (65535.0 * cell1) / (length-1);
a = (y1 - y0) / (x1 - x0);
b = y0 - a * x0;
if (fabs(a) < 0.01) return (uint16_fract_t) x;
f = ((Value - b) / a);
if (f < 0.0) return (uint16_fract_t) 0;
if (f >= 65535.0) return (uint16_fract_t) 0xFFFF;
return (uint16_fract_t) floor(f + 0.5);
}
// Build a White point, primary chromas transfer matrix from RGB to CIE XYZ
// This is just an approximation, I am not handling all the non-linear
// aspects of the RGB to XYZ process, and assumming that the gamma correction
// has transitive property in the tranformation chain.
//
// the alghoritm:
//
// - First I build the absolute conversion matrix using
// primaries in XYZ. This matrix is next inverted
// - Then I eval the source white point across this matrix
// obtaining the coeficients of the transformation
// - Then, I apply these coeficients to the original matrix
static struct matrix build_RGB_to_XYZ_transfer_matrix(qcms_CIE_xyY white, qcms_CIE_xyYTRIPLE primrs)
{
struct matrix primaries;
struct matrix primaries_invert;
struct matrix result;
struct vector white_point;
struct vector coefs;
double xn, yn;
double xr, yr;
double xg, yg;
double xb, yb;
xn = white.x;
yn = white.y;
if (yn == 0.0)
return matrix_invalid();
xr = primrs.red.x;
yr = primrs.red.y;
xg = primrs.green.x;
yg = primrs.green.y;
xb = primrs.blue.x;
yb = primrs.blue.y;
primaries.m[0][0] = xr;
primaries.m[0][1] = xg;
primaries.m[0][2] = xb;
primaries.m[1][0] = yr;
primaries.m[1][1] = yg;
primaries.m[1][2] = yb;
primaries.m[2][0] = 1 - xr - yr;
primaries.m[2][1] = 1 - xg - yg;
primaries.m[2][2] = 1 - xb - yb;
primaries.invalid = false;
white_point.v[0] = xn/yn;
white_point.v[1] = 1.;
white_point.v[2] = (1.0-xn-yn)/yn;
primaries_invert = matrix_invert(primaries);
coefs = matrix_eval(primaries_invert, white_point);
result.m[0][0] = coefs.v[0]*xr;
result.m[0][1] = coefs.v[1]*xg;
result.m[0][2] = coefs.v[2]*xb;
result.m[1][0] = coefs.v[0]*yr;
result.m[1][1] = coefs.v[1]*yg;
result.m[1][2] = coefs.v[2]*yb;
result.m[2][0] = coefs.v[0]*(1.-xr-yr);
result.m[2][1] = coefs.v[1]*(1.-xg-yg);
result.m[2][2] = coefs.v[2]*(1.-xb-yb);
result.invalid = primaries_invert.invalid;
return result;
}
struct CIE_XYZ {
double X;
double Y;
double Z;
};
/* CIE Illuminant D50 */
static const struct CIE_XYZ D50_XYZ = {
0.9642,
1.0000,
0.8249
};
/* from lcms: xyY2XYZ()
* corresponds to argyll: icmYxy2XYZ() */
static struct CIE_XYZ xyY2XYZ(qcms_CIE_xyY source)
{
struct CIE_XYZ dest;
dest.X = (source.x / source.y) * source.Y;
dest.Y = source.Y;
dest.Z = ((1 - source.x - source.y) / source.y) * source.Y;
return dest;
}
/* from lcms: ComputeChromaticAdaption */
// Compute chromatic adaption matrix using chad as cone matrix
static struct matrix
compute_chromatic_adaption(struct CIE_XYZ source_white_point,
struct CIE_XYZ dest_white_point,
struct matrix chad)
{
struct matrix chad_inv;
struct vector cone_source_XYZ, cone_source_rgb;
struct vector cone_dest_XYZ, cone_dest_rgb;
struct matrix cone, tmp;
tmp = chad;
chad_inv = matrix_invert(tmp);
cone_source_XYZ.v[0] = source_white_point.X;
cone_source_XYZ.v[1] = source_white_point.Y;
cone_source_XYZ.v[2] = source_white_point.Z;
cone_dest_XYZ.v[0] = dest_white_point.X;
cone_dest_XYZ.v[1] = dest_white_point.Y;
cone_dest_XYZ.v[2] = dest_white_point.Z;
cone_source_rgb = matrix_eval(chad, cone_source_XYZ);
cone_dest_rgb = matrix_eval(chad, cone_dest_XYZ);
cone.m[0][0] = cone_dest_rgb.v[0]/cone_source_rgb.v[0];
cone.m[0][1] = 0;
cone.m[0][2] = 0;
cone.m[1][0] = 0;
cone.m[1][1] = cone_dest_rgb.v[1]/cone_source_rgb.v[1];
cone.m[1][2] = 0;
cone.m[2][0] = 0;
cone.m[2][1] = 0;
cone.m[2][2] = cone_dest_rgb.v[2]/cone_source_rgb.v[2];
cone.invalid = false;
// Normalize
return matrix_multiply(chad_inv, matrix_multiply(cone, chad));
}
/* from lcms: cmsAdaptionMatrix */
// Returns the final chrmatic adaptation from illuminant FromIll to Illuminant ToIll
// Bradford is assumed
static struct matrix
adaption_matrix(struct CIE_XYZ source_illumination, struct CIE_XYZ target_illumination)
{
struct matrix lam_rigg = {{ // Bradford matrix
{ 0.8951, 0.2664, -0.1614 },
{ -0.7502, 1.7135, 0.0367 },
{ 0.0389, -0.0685, 1.0296 }
}};
return compute_chromatic_adaption(source_illumination, target_illumination, lam_rigg);
}
/* from lcms: cmsAdaptMatrixToD50 */
static struct matrix adapt_matrix_to_D50(struct matrix r, qcms_CIE_xyY source_white_pt)
{
struct CIE_XYZ Dn;
struct matrix Bradford;
if (source_white_pt.y == 0.0)
return matrix_invalid();
Dn = xyY2XYZ(source_white_pt);
Bradford = adaption_matrix(Dn, D50_XYZ);
return matrix_multiply(Bradford, r);
}
qcms_bool set_rgb_colorants(qcms_profile *profile, qcms_CIE_xyY white_point, qcms_CIE_xyYTRIPLE primaries)
{
struct matrix colorants;
colorants = build_RGB_to_XYZ_transfer_matrix(white_point, primaries);
colorants = adapt_matrix_to_D50(colorants, white_point);
if (colorants.invalid)
return false;
/* note: there's a transpose type of operation going on here */
profile->redColorant.X = double_to_s15Fixed16Number(colorants.m[0][0]);
profile->redColorant.Y = double_to_s15Fixed16Number(colorants.m[1][0]);
profile->redColorant.Z = double_to_s15Fixed16Number(colorants.m[2][0]);
profile->greenColorant.X = double_to_s15Fixed16Number(colorants.m[0][1]);
profile->greenColorant.Y = double_to_s15Fixed16Number(colorants.m[1][1]);
profile->greenColorant.Z = double_to_s15Fixed16Number(colorants.m[2][1]);
profile->blueColorant.X = double_to_s15Fixed16Number(colorants.m[0][2]);
profile->blueColorant.Y = double_to_s15Fixed16Number(colorants.m[1][2]);
profile->blueColorant.Z = double_to_s15Fixed16Number(colorants.m[2][2]);
return true;
}
/*
The number of entries needed to invert a lookup table should not
necessarily be the same as the original number of entries. This is
especially true of lookup tables that have a small number of entries.
For example:
Using a table like:
{0, 3104, 14263, 34802, 65535}
invert_lut will produce an inverse of:
{3, 34459, 47529, 56801, 65535}
which has an maximum error of about 9855 (pixel difference of ~38.346)
For now, we punt the decision of output size to the caller. */
static uint16_t *invert_lut(uint16_t *table, int length, int out_length)
{
int i;
/* for now we invert the lut by creating a lut of size out_length
* and attempting to lookup a value for each entry using lut_inverse_interp16 */
uint16_t *output = malloc(sizeof(uint16_t)*out_length);
if (!output)
return NULL;
for (i = 0; i < out_length; i++) {
double x = ((double) i * 65535.) / (double) (out_length - 1);
uint16_fract_t input = floor(x + .5);
output[i] = lut_inverse_interp16(input, table, length);
}
return output;
}
static uint16_t *build_linear_table(int length)
{
int i;
uint16_t *output = malloc(sizeof(uint16_t)*length);
if (!output)
return NULL;
for (i = 0; i < length; i++) {
double x = ((double) i * 65535.) / (double) (length - 1);
uint16_fract_t input = floor(x + .5);
output[i] = input;
}
return output;
}
static uint16_t *build_pow_table(float gamma, int length)
{
int i;
uint16_t *output = malloc(sizeof(uint16_t)*length);
if (!output)
return NULL;
for (i = 0; i < length; i++) {
uint16_fract_t result;
double x = ((double) i) / (double) (length - 1);
x = pow(x, gamma);
//XXX turn this conversion into a function
result = floor(x*65535. + .5);
output[i] = result;
}
return output;
}
static float clamp_float(float a)
{
if (a > 1.)
return 1.;
else if (a < 0)
return 0;
else
return a;
}
#if 0
static void qcms_transform_data_rgb_out_pow(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
int i;
float (*mat)[4] = transform->matrix;
for (i=0; i<length; i++) {
unsigned char device_r = *src++;
unsigned char device_g = *src++;
unsigned char device_b = *src++;
float linear_r = transform->input_gamma_table_r[device_r];
float linear_g = transform->input_gamma_table_g[device_g];
float linear_b = transform->input_gamma_table_b[device_b];
float out_linear_r = mat[0][0]*linear_r + mat[1][0]*linear_g + mat[2][0]*linear_b;
float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
float out_device_r = pow(out_linear_r, transform->out_gamma_r);
float out_device_g = pow(out_linear_g, transform->out_gamma_g);
float out_device_b = pow(out_linear_b, transform->out_gamma_b);
*dest++ = clamp_u8(255*out_device_r);
*dest++ = clamp_u8(255*out_device_g);
*dest++ = clamp_u8(255*out_device_b);
}
}
#endif
static void qcms_transform_data_gray_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
for (i = 0; i < length; i++) {
float out_device_r, out_device_g, out_device_b;
unsigned char device = *src++;
float linear = transform->input_gamma_table_gray[device];
out_device_r = lut_interp_linear(linear, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
out_device_g = lut_interp_linear(linear, transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
out_device_b = lut_interp_linear(linear, transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
*dest++ = clamp_u8(out_device_r*255);
*dest++ = clamp_u8(out_device_g*255);
*dest++ = clamp_u8(out_device_b*255);
}
}
/* Alpha is not corrected.
A rationale for this is found in Alvy Ray's "Should Alpha Be Nonlinear If
RGB Is?" Tech Memo 17 (December 14, 1998).
See: ftp://ftp.alvyray.com/Acrobat/17_Nonln.pdf
*/
static void qcms_transform_data_graya_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
for (i = 0; i < length; i++) {
float out_device_r, out_device_g, out_device_b;
unsigned char device = *src++;
unsigned char alpha = *src++;
float linear = transform->input_gamma_table_gray[device];
out_device_r = lut_interp_linear(linear, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
out_device_g = lut_interp_linear(linear, transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
out_device_b = lut_interp_linear(linear, transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
*dest++ = clamp_u8(out_device_r*255);
*dest++ = clamp_u8(out_device_g*255);
*dest++ = clamp_u8(out_device_b*255);
*dest++ = alpha;
}
}
static void qcms_transform_data_gray_out_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
for (i = 0; i < length; i++) {
unsigned char device = *src++;
uint16_t gray;
float linear = transform->input_gamma_table_gray[device];
/* we could round here... */
gray = linear * PRECACHE_OUTPUT_MAX;
*dest++ = transform->output_table_r->data[gray];
*dest++ = transform->output_table_g->data[gray];
*dest++ = transform->output_table_b->data[gray];
}
}
static void qcms_transform_data_graya_out_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
for (i = 0; i < length; i++) {
unsigned char device = *src++;
unsigned char alpha = *src++;
uint16_t gray;
float linear = transform->input_gamma_table_gray[device];
/* we could round here... */
gray = linear * PRECACHE_OUTPUT_MAX;
*dest++ = transform->output_table_r->data[gray];
*dest++ = transform->output_table_g->data[gray];
*dest++ = transform->output_table_b->data[gray];
*dest++ = alpha;
}
}
static void qcms_transform_data_rgb_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
float (*mat)[4] = transform->matrix;
for (i = 0; i < length; i++) {
unsigned char device_r = *src++;
unsigned char device_g = *src++;
unsigned char device_b = *src++;
uint16_t r, g, b;
float linear_r = transform->input_gamma_table_r[device_r];
float linear_g = transform->input_gamma_table_g[device_g];
float linear_b = transform->input_gamma_table_b[device_b];
float out_linear_r = mat[0][0]*linear_r + mat[1][0]*linear_g + mat[2][0]*linear_b;
float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
out_linear_r = clamp_float(out_linear_r);
out_linear_g = clamp_float(out_linear_g);
out_linear_b = clamp_float(out_linear_b);
/* we could round here... */
r = out_linear_r * PRECACHE_OUTPUT_MAX;
g = out_linear_g * PRECACHE_OUTPUT_MAX;
b = out_linear_b * PRECACHE_OUTPUT_MAX;
*dest++ = transform->output_table_r->data[r];
*dest++ = transform->output_table_g->data[g];
*dest++ = transform->output_table_b->data[b];
}
}
static void qcms_transform_data_rgba_out_lut_precache(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
float (*mat)[4] = transform->matrix;
for (i = 0; i < length; i++) {
unsigned char device_r = *src++;
unsigned char device_g = *src++;
unsigned char device_b = *src++;
unsigned char alpha = *src++;
uint16_t r, g, b;
float linear_r = transform->input_gamma_table_r[device_r];
float linear_g = transform->input_gamma_table_g[device_g];
float linear_b = transform->input_gamma_table_b[device_b];
float out_linear_r = mat[0][0]*linear_r + mat[1][0]*linear_g + mat[2][0]*linear_b;
float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
out_linear_r = clamp_float(out_linear_r);
out_linear_g = clamp_float(out_linear_g);
out_linear_b = clamp_float(out_linear_b);
/* we could round here... */
r = out_linear_r * PRECACHE_OUTPUT_MAX;
g = out_linear_g * PRECACHE_OUTPUT_MAX;
b = out_linear_b * PRECACHE_OUTPUT_MAX;
*dest++ = transform->output_table_r->data[r];
*dest++ = transform->output_table_g->data[g];
*dest++ = transform->output_table_b->data[b];
*dest++ = alpha;
}
}
static void qcms_transform_data_rgb_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
float (*mat)[4] = transform->matrix;
for (i = 0; i < length; i++) {
unsigned char device_r = *src++;
unsigned char device_g = *src++;
unsigned char device_b = *src++;
float out_device_r, out_device_g, out_device_b;
float linear_r = transform->input_gamma_table_r[device_r];
float linear_g = transform->input_gamma_table_g[device_g];
float linear_b = transform->input_gamma_table_b[device_b];
float out_linear_r = mat[0][0]*linear_r + mat[1][0]*linear_g + mat[2][0]*linear_b;
float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
out_linear_r = clamp_float(out_linear_r);
out_linear_g = clamp_float(out_linear_g);
out_linear_b = clamp_float(out_linear_b);
out_device_r = lut_interp_linear(out_linear_r, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
out_device_g = lut_interp_linear(out_linear_g, transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
out_device_b = lut_interp_linear(out_linear_b, transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
*dest++ = clamp_u8(out_device_r*255);
*dest++ = clamp_u8(out_device_g*255);
*dest++ = clamp_u8(out_device_b*255);
}
}
static void qcms_transform_data_rgba_out_lut(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
unsigned int i;
float (*mat)[4] = transform->matrix;
for (i = 0; i < length; i++) {
unsigned char device_r = *src++;
unsigned char device_g = *src++;
unsigned char device_b = *src++;
unsigned char alpha = *src++;
float out_device_r, out_device_g, out_device_b;
float linear_r = transform->input_gamma_table_r[device_r];
float linear_g = transform->input_gamma_table_g[device_g];
float linear_b = transform->input_gamma_table_b[device_b];
float out_linear_r = mat[0][0]*linear_r + mat[1][0]*linear_g + mat[2][0]*linear_b;
float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
out_linear_r = clamp_float(out_linear_r);
out_linear_g = clamp_float(out_linear_g);
out_linear_b = clamp_float(out_linear_b);
out_device_r = lut_interp_linear(out_linear_r, transform->output_gamma_lut_r, transform->output_gamma_lut_r_length);
out_device_g = lut_interp_linear(out_linear_g, transform->output_gamma_lut_g, transform->output_gamma_lut_g_length);
out_device_b = lut_interp_linear(out_linear_b, transform->output_gamma_lut_b, transform->output_gamma_lut_b_length);
*dest++ = clamp_u8(out_device_r*255);
*dest++ = clamp_u8(out_device_g*255);
*dest++ = clamp_u8(out_device_b*255);
*dest++ = alpha;
}
}
#if 0
static void qcms_transform_data_rgb_out_linear(qcms_transform *transform, unsigned char *src, unsigned char *dest, size_t length)
{
int i;
float (*mat)[4] = transform->matrix;
for (i = 0; i < length; i++) {
unsigned char device_r = *src++;
unsigned char device_g = *src++;
unsigned char device_b = *src++;
float linear_r = transform->input_gamma_table_r[device_r];
float linear_g = transform->input_gamma_table_g[device_g];
float linear_b = transform->input_gamma_table_b[device_b];
float out_linear_r = mat[0][0]*linear_r + mat[1][0]*linear_g + mat[2][0]*linear_b;
float out_linear_g = mat[0][1]*linear_r + mat[1][1]*linear_g + mat[2][1]*linear_b;
float out_linear_b = mat[0][2]*linear_r + mat[1][2]*linear_g + mat[2][2]*linear_b;
*dest++ = clamp_u8(out_linear_r*255);
*dest++ = clamp_u8(out_linear_g*255);
*dest++ = clamp_u8(out_linear_b*255);
}
}
#endif
static struct precache_output *precache_reference(struct precache_output *p)
{
p->ref_count++;
return p;
}
static struct precache_output *precache_create()
{
struct precache_output *p = malloc(sizeof(struct precache_output));
if (p)
p->ref_count = 1;
return p;
}
void precache_release(struct precache_output *p)
{
if (--p->ref_count == 0) {
free(p);
}
}
#ifdef HAS_POSIX_MEMALIGN
static qcms_transform *transform_alloc(void)
{
qcms_transform *t;
if (!posix_memalign(&t, 16, sizeof(*t))) {
return t;
} else {
return NULL;
}
}
static void transform_free(qcms_transform *t)
{
free(t);
}
#else
static qcms_transform *transform_alloc(void)
{
/* transform needs to be aligned on a 16byte boundrary */
char *original_block = calloc(sizeof(qcms_transform) + sizeof(void*) + 16, 1);
/* make room for a pointer to the block returned by calloc */
void *transform_start = original_block + sizeof(void*);
/* align transform_start */
qcms_transform *transform_aligned = (qcms_transform*)(((uintptr_t)transform_start + 15) & ~0xf);
/* store a pointer to the block returned by calloc so that we can free it later */
void **(original_block_ptr) = (void**)transform_aligned;
if (!original_block)
return NULL;
original_block_ptr--;
*original_block_ptr = original_block;
return transform_aligned;
}
static void transform_free(qcms_transform *t)
{
/* get at the pointer to the unaligned block returned by calloc */
void **p = (void**)t;
p--;