ParametricStageTest.cpp File Reference

#include "modules/skcms/skcms.h"
#include "src/core/SkRasterPipeline.h"
#include "src/core/SkRasterPipelineOpContexts.h"
#include "src/core/SkRasterPipelineOpList.h"
#include "tests/Test.h"
#include <cmath>

Go to the source code of this file.

Functions
static void	check_error (skiatest::Reporter *r, float limit, skcms_TransferFunction fn)
static void	check_error (skiatest::Reporter *r, float limit, float gamma)
	DEF_TEST (Parametric_sRGB, r)
	DEF_TEST (Parametric_1dot0, r)
	DEF_TEST (Parametric_1dot2, r)
	DEF_TEST (Parametric_1dot4, r)
	DEF_TEST (Parametric_1dot8, r)
	DEF_TEST (Parametric_2dot0, r)
	DEF_TEST (Parametric_2dot2, r)
	DEF_TEST (Parametric_2dot4, r)
	DEF_TEST (Parametric_inv_1dot2, r)
	DEF_TEST (Parametric_inv_1dot4, r)
	DEF_TEST (Parametric_inv_1dot8, r)
	DEF_TEST (Parametric_inv_2dot0, r)
	DEF_TEST (Parametric_inv_2dot2, r)
	DEF_TEST (Parametric_inv_2dot4, r)

Function Documentation

check_error() [1/2]

static void check_error ( skiatest::Reporter *  r, float  limit, float  gamma  )

static

Definition at line 47 of file ParametricStageTest.cpp.

                                                                       {
    skcms_TransferFunction fn = {0,0,0,0,0,0,0};
    fn.g = gamma;
    fn.a = 1;
    check_error(r, limit, fn);
}

check_error() [2/2]

static void check_error ( skiatest::Reporter *  r, float  limit, skcms_TransferFunction  fn  )

static

Definition at line 16 of file ParametricStageTest.cpp.

                                                                                     {
    float in[256], out[256];
    for (int i = 0; i < 256; i++) {
        in [i] = i / 255.0f;
        out[i] = 0.0f;  // Not likely important.  Just being tidy.
    }
 
    SkRasterPipeline_MemoryCtx ip = { in, 0},
                               op = {out, 0};
 
    SkRasterPipeline_<256> p;
    p.append(SkRasterPipelineOp::load_f32, &ip);
    p.appendTransferFunction(fn);
    p.append(SkRasterPipelineOp::store_f32, &op);
 
    p.run(0,0, 256/4,1);
 
 
    for (int i = 0; i < 256; i++) {
        float want = (in[i] <= fn.d) ? fn.c * in[i] + fn.f
                                     : powf(in[i] * fn.a + fn.b, fn.g) + fn.e;
        if (i % 4 == 3) {  // alpha should stay unchanged.
            want = in[i];
        }
        float err = fabsf(out[i] - want);
        if (err > limit) {
            ERRORF(r, "At %d, error was %g (got %g, want %g)", i, err, out[i], want);
        }
    }
}

DEF_TEST() [1/14]

DEF_TEST	(	Parametric_1dot0	,
		r
	)

Definition at line 68 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1.0f); }

DEF_TEST() [2/14]

DEF_TEST	(	Parametric_1dot2	,
		r
	)

Definition at line 70 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1.2f); }

DEF_TEST() [3/14]

DEF_TEST	(	Parametric_1dot4	,
		r
	)

Definition at line 71 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1.4f); }

DEF_TEST() [4/14]

DEF_TEST	(	Parametric_1dot8	,
		r
	)

Definition at line 72 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1.8f); }

DEF_TEST() [5/14]

DEF_TEST	(	Parametric_2dot0	,
		r
	)

Definition at line 73 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 2.0f); }

DEF_TEST() [6/14]

DEF_TEST	(	Parametric_2dot2	,
		r
	)

Definition at line 74 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 2.2f); }

DEF_TEST() [7/14]

DEF_TEST	(	Parametric_2dot4	,
		r
	)

Definition at line 75 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 2.4f); }

DEF_TEST() [8/14]

DEF_TEST	(	Parametric_inv_1dot2	,
		r
	)

Definition at line 77 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1/1.2f); }

DEF_TEST() [9/14]

DEF_TEST	(	Parametric_inv_1dot4	,
		r
	)

Definition at line 78 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1/1.4f); }

DEF_TEST() [10/14]

DEF_TEST	(	Parametric_inv_1dot8	,
		r
	)

Definition at line 79 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1/1.8f); }

DEF_TEST() [11/14]

DEF_TEST	(	Parametric_inv_2dot0	,
		r
	)

Definition at line 80 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1/2.0f); }

DEF_TEST() [12/14]

DEF_TEST	(	Parametric_inv_2dot2	,
		r
	)

Definition at line 81 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1/2.2f); }

DEF_TEST() [13/14]

DEF_TEST	(	Parametric_inv_2dot4	,
		r
	)

Definition at line 82 of file ParametricStageTest.cpp.

{ check_error(r, 1/510.0f, 1/2.4f); }

DEF_TEST() [14/14]

DEF_TEST	(	Parametric_sRGB	,
		r
	)

Definition at line 54 of file ParametricStageTest.cpp.

                             {
    // Test our good buddy the sRGB transfer function in resplendent 7-parameter glory.
    check_error(r, 1/510.0f, {
        2.4f,
        1.0f / 1.055f,
        0.055f / 1.055f,
        1.0f / 12.92f,
        0.04045f,
        0.0f,
        0.0f,
    });
}