Color management: add functions to detect scene linear and sRGB color spaces
Same as the ones in Cycles, but intended for GPU textures.
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@ -114,11 +114,11 @@ ustring ColorSpaceManager::detect_known_colorspace(ustring colorspace,
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}
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/* Detect if it matches a simple builtin colorspace. */
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bool is_no_op, is_srgb;
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is_builtin_colorspace(colorspace, is_no_op, is_srgb);
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bool is_scene_linear, is_srgb;
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is_builtin_colorspace(colorspace, is_scene_linear, is_srgb);
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thread_scoped_lock cache_lock(cache_mutex);
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if (is_no_op) {
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if (is_scene_linear) {
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VLOG(1) << "Colorspace " << colorspace.string() << " is no-op";
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cached_colorspaces[colorspace] = u_colorspace_raw;
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return u_colorspace_raw;
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@ -154,17 +154,19 @@ ustring ColorSpaceManager::detect_known_colorspace(ustring colorspace,
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}
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}
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void ColorSpaceManager::is_builtin_colorspace(ustring colorspace, bool &is_no_op, bool &is_srgb)
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void ColorSpaceManager::is_builtin_colorspace(ustring colorspace,
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bool &is_scene_linear,
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bool &is_srgb)
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{
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#ifdef WITH_OCIO
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const OCIO::Processor *processor = (const OCIO::Processor *)get_processor(colorspace);
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if (!processor) {
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is_no_op = false;
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is_scene_linear = false;
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is_srgb = false;
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return;
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}
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is_no_op = true;
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is_scene_linear = true;
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is_srgb = true;
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for (int i = 0; i < 256; i++) {
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float v = i / 255.0f;
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@ -181,27 +183,27 @@ void ColorSpaceManager::is_builtin_colorspace(ustring colorspace, bool &is_no_op
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/* Make sure that there is no channel crosstalk. */
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if (fabsf(cR[1]) > 1e-5f || fabsf(cR[2]) > 1e-5f || fabsf(cG[0]) > 1e-5f ||
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fabsf(cG[2]) > 1e-5f || fabsf(cB[0]) > 1e-5f || fabsf(cB[1]) > 1e-5f) {
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is_no_op = false;
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is_scene_linear = false;
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is_srgb = false;
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break;
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}
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/* Make sure that the three primaries combine linearly. */
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if (!compare_floats(cR[0], cW[0], 1e-6f, 64) || !compare_floats(cG[1], cW[1], 1e-6f, 64) ||
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!compare_floats(cB[2], cW[2], 1e-6f, 64)) {
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is_no_op = false;
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is_scene_linear = false;
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is_srgb = false;
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break;
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}
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/* Make sure that the three channels behave identically. */
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if (!compare_floats(cW[0], cW[1], 1e-6f, 64) || !compare_floats(cW[1], cW[2], 1e-6f, 64)) {
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is_no_op = false;
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is_scene_linear = false;
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is_srgb = false;
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break;
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}
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float out_v = average(make_float3(cW[0], cW[1], cW[2]));
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if (!compare_floats(v, out_v, 1e-6f, 64)) {
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is_no_op = false;
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is_scene_linear = false;
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}
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if (!compare_floats(color_srgb_to_linear(v), out_v, 1e-6f, 64)) {
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is_srgb = false;
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@ -209,7 +211,7 @@ void ColorSpaceManager::is_builtin_colorspace(ustring colorspace, bool &is_no_op
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}
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#else
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(void)colorspace;
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is_no_op = false;
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is_scene_linear = false;
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is_srgb = false;
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#endif
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}
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@ -363,6 +363,25 @@ int FallbackImpl::colorSpaceIsData(OCIO_ConstColorSpaceRcPtr * /*cs*/)
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return 0;
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}
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void FallbackImpl::colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr * /*config*/,
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OCIO_ConstColorSpaceRcPtr *cs,
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bool &is_scene_linear,
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bool &is_srgb)
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{
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if (cs == COLORSPACE_LINEAR) {
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is_scene_linear = true;
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is_srgb = false;
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}
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else if (cs == COLORSPACE_SRGB) {
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is_scene_linear = false;
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is_srgb = true;
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}
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else {
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is_scene_linear = false;
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is_srgb = false;
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}
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}
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void FallbackImpl::colorSpaceRelease(OCIO_ConstColorSpaceRcPtr * /*cs*/)
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{
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}
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@ -174,6 +174,14 @@ int OCIO_colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs)
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return impl->colorSpaceIsData(cs);
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}
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void OCIO_colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config,
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OCIO_ConstColorSpaceRcPtr *cs,
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bool *is_scene_linear,
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bool *is_srgb)
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{
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impl->colorSpaceIsBuiltin(config, cs, *is_scene_linear, *is_srgb);
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}
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void OCIO_colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs)
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{
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impl->colorSpaceRelease(cs);
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@ -130,6 +130,10 @@ int OCIO_configGetIndexForColorSpace(OCIO_ConstConfigRcPtr *config, const char *
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int OCIO_colorSpaceIsInvertible(OCIO_ConstColorSpaceRcPtr *cs);
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int OCIO_colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs);
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void OCIO_colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config,
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OCIO_ConstColorSpaceRcPtr *cs,
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bool *is_scene_linear,
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bool *is_srgb);
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void OCIO_colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs);
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@ -18,6 +18,7 @@
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*/
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#include <iostream>
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#include <math.h>
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#include <sstream>
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#include <string.h>
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@ -34,6 +35,8 @@ using namespace OCIO_NAMESPACE;
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#include "MEM_guardedalloc.h"
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#include "BLI_math_color.h"
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#include "ocio_impl.h"
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#if !defined(WITH_ASSERT_ABORT)
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@ -520,6 +523,86 @@ int OCIOImpl::colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs)
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return (*(ConstColorSpaceRcPtr *)cs)->isData();
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}
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static float compare_floats(float a, float b, float abs_diff, int ulp_diff)
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{
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/* Returns true if the absolute difference is smaller than abs_diff (for numbers near zero)
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* or their relative difference is less than ulp_diff ULPs. Based on:
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* https://randomascii.wordpress.com/2012/02/25/comparing-floating-point-numbers-2012-edition/ */
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if (fabsf(a - b) < abs_diff) {
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return true;
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}
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if ((a < 0.0f) != (b < 0.0f)) {
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return false;
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}
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return (abs((*(int *)&a) - (*(int *)&b)) < ulp_diff);
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}
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void OCIOImpl::colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config_,
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OCIO_ConstColorSpaceRcPtr *cs_,
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bool &is_scene_linear,
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bool &is_srgb)
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{
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ConstConfigRcPtr *config = (ConstConfigRcPtr *)config_;
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ConstColorSpaceRcPtr *cs = (ConstColorSpaceRcPtr *)cs_;
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ConstProcessorRcPtr processor;
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try {
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processor = (*config)->getProcessor((*cs)->getName(), "scene_linear");
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}
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catch (Exception &exception) {
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OCIO_reportException(exception);
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is_scene_linear = false;
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is_srgb = false;
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return;
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}
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is_scene_linear = true;
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is_srgb = true;
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for (int i = 0; i < 256; i++) {
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float v = i / 255.0f;
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float cR[3] = {v, 0, 0};
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float cG[3] = {0, v, 0};
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float cB[3] = {0, 0, v};
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float cW[3] = {v, v, v};
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processor->applyRGB(cR);
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processor->applyRGB(cG);
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processor->applyRGB(cB);
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processor->applyRGB(cW);
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/* Make sure that there is no channel crosstalk. */
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if (fabsf(cR[1]) > 1e-5f || fabsf(cR[2]) > 1e-5f || fabsf(cG[0]) > 1e-5f ||
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fabsf(cG[2]) > 1e-5f || fabsf(cB[0]) > 1e-5f || fabsf(cB[1]) > 1e-5f) {
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is_scene_linear = false;
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is_srgb = false;
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break;
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}
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/* Make sure that the three primaries combine linearly. */
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if (!compare_floats(cR[0], cW[0], 1e-6f, 64) || !compare_floats(cG[1], cW[1], 1e-6f, 64) ||
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!compare_floats(cB[2], cW[2], 1e-6f, 64)) {
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is_scene_linear = false;
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is_srgb = false;
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break;
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}
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/* Make sure that the three channels behave identically. */
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if (!compare_floats(cW[0], cW[1], 1e-6f, 64) || !compare_floats(cW[1], cW[2], 1e-6f, 64)) {
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is_scene_linear = false;
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is_srgb = false;
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break;
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}
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float out_v = (cW[0] + cW[1] + cW[2]) * (1.0f / 3.0f);
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if (!compare_floats(v, out_v, 1e-6f, 64)) {
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is_scene_linear = false;
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}
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if (!compare_floats(srgb_to_linearrgb(v), out_v, 1e-6f, 64)) {
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is_srgb = false;
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}
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}
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}
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void OCIOImpl::colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs)
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{
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OBJECT_GUARDED_DELETE((ConstColorSpaceRcPtr *)cs, ConstColorSpaceRcPtr);
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@ -44,6 +44,10 @@ class IOCIOImpl {
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virtual int colorSpaceIsInvertible(OCIO_ConstColorSpaceRcPtr *cs) = 0;
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virtual int colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs) = 0;
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virtual void colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config,
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OCIO_ConstColorSpaceRcPtr *cs,
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bool &is_scene_linear,
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bool &is_srgb) = 0;
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virtual void colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs) = 0;
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@ -160,6 +164,10 @@ class FallbackImpl : public IOCIOImpl {
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int colorSpaceIsInvertible(OCIO_ConstColorSpaceRcPtr *cs);
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int colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs);
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void colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config,
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OCIO_ConstColorSpaceRcPtr *cs,
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bool &is_scene_linear,
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bool &is_srgb);
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void colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs);
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@ -266,6 +274,10 @@ class OCIOImpl : public IOCIOImpl {
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int colorSpaceIsInvertible(OCIO_ConstColorSpaceRcPtr *cs);
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int colorSpaceIsData(OCIO_ConstColorSpaceRcPtr *cs);
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void colorSpaceIsBuiltin(OCIO_ConstConfigRcPtr *config,
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OCIO_ConstColorSpaceRcPtr *cs,
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bool &is_scene_linear,
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bool &is_srgb);
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void colorSpaceRelease(OCIO_ConstColorSpaceRcPtr *cs);
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