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color-lcms: recognize LCMS curves that matches transfer functions
LittleCMS curves contain curves that are parametric. They may be well-known curves, and we are not checking that. If that's the case, we should create enumerated color curves, instead of parametric. This can be helpful for renderers and/or backends that want to implement the curve, as they may have access to an API that accept enumerated curves. Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
This commit is contained in:
Leandro Ribeiro
Pekka Paalanen
parent
209882c7d4
commit
ccf6db49b7
3 changed files with 171 additions and 6 deletions
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@ -442,15 +442,83 @@ merge_curvesets(cmsPipeline **lut, cmsContext context_id)
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return modified;
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}
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static const struct weston_color_tf_info *
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lcms_curve_matches_any_tf(struct weston_compositor *compositor,
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uint32_t lcms_curve_type, bool clamped_input,
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const float lcms_curve_params[3][MAX_PARAMS_LCMS_PARAM_CURVE])
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{
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struct weston_color_curve_parametric curve = { 0 };
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unsigned int i, j;
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uint32_t n_lcms_curve_params;
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curve.clamped_input = clamped_input;
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switch(lcms_curve_type) {
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case 1:
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/**
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* LittleCMS type 1 is the pure power-law curve, which is a
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* special case of LINPOW. See linpow_from_type_1().
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*/
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n_lcms_curve_params = 1;
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curve.type = WESTON_COLOR_CURVE_PARAMETRIC_TYPE_LINPOW;
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break;
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case 4:
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/**
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* LittleCMS type 4 is almost exactly the same as LINPOW. See
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* linpow_from_type_4().
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*/
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n_lcms_curve_params = 5;
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curve.type = WESTON_COLOR_CURVE_PARAMETRIC_TYPE_LINPOW;
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break;
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default:
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return NULL;
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}
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weston_assert_uint32_lt_or_eq(compositor,
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n_lcms_curve_params, MAX_PARAMS_LCMS_PARAM_CURVE);
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for (i = 0; i < 3; i++)
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for (j = 0; j < n_lcms_curve_params; j++)
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curve.params[i][j] = lcms_curve_params[i][j];
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return weston_color_tf_info_from_parametric_curve(&curve);
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}
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static bool
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linpow_from_type_1(struct weston_compositor *compositor,
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struct weston_color_curve *curve,
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const float type_1_params[3][MAX_PARAMS_LCMS_PARAM_CURVE],
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bool clamped_input)
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{
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struct weston_color_curve_enum *enumerated = &curve->u.enumerated;
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struct weston_color_curve_parametric *parametric = &curve->u.parametric;
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const struct weston_color_tf_info *tf_info;
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unsigned int i;
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/* Check if LittleCMS curve matches any TF (except the parametric TF's). */
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tf_info = lcms_curve_matches_any_tf(compositor, 1, clamped_input, type_1_params);
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if (tf_info) {
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curve->type = WESTON_COLOR_CURVE_TYPE_ENUM;
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enumerated->tf = tf_info;
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enumerated->tf_direction = WESTON_FORWARD_TF;
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return true;
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}
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/* This is a pure power-law with custom exp. If clamped_input == false,
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* this matches WESTON_TF_POWER (parametric TF that is not clamped). */
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if (!clamped_input) {
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curve->type = WESTON_COLOR_CURVE_TYPE_ENUM;
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enumerated->tf = weston_color_tf_info_from(compositor,
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WESTON_TF_POWER);
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enumerated->tf_direction = WESTON_FORWARD_TF;
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for (i = 0; i < 3; i++)
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enumerated->params[i][0] = type_1_params[i][0];
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return true;
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}
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/* Pure power-law with custom exp and clamped_input. We don't have any
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* TF that matches this, so let's use a parametric curve. */
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curve->type = WESTON_COLOR_CURVE_TYPE_PARAMETRIC;
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/* LittleCMS type 1 is the pure power-law curve, which is a special case
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@ -472,7 +540,7 @@ linpow_from_type_1(struct weston_compositor *compositor,
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parametric->type = WESTON_COLOR_CURVE_PARAMETRIC_TYPE_LINPOW;
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parametric->clamped_input = clamped_input;
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for (i = 0; i < ARRAY_LENGTH(parametric->params); i++) {
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for (i = 0; i < 3; i++) {
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parametric->params[i][0] = type_1_params[i][0]; /* g */
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parametric->params[i][1] = 1.0f; /* a */
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parametric->params[i][2] = 0.0f; /* b */
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@ -490,11 +558,44 @@ linpow_from_type_1_inverse(struct weston_compositor *compositor,
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bool clamped_input)
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{
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struct weston_color_manager_lcms *cm = to_cmlcms(compositor->color_manager);
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struct weston_color_curve_enum *enumerated = &curve->u.enumerated;
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struct weston_color_curve_parametric *parametric = &curve->u.parametric;
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const struct weston_color_tf_info *tf_info;
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float g;
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const char *err_msg;
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unsigned int i;
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/* Check if LittleCMS curve matches any TF (except the parametric TF's). */
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tf_info = lcms_curve_matches_any_tf(compositor, 1, clamped_input, type_1_params);
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if (tf_info) {
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curve->type = WESTON_COLOR_CURVE_TYPE_ENUM;
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enumerated->tf = tf_info;
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enumerated->tf_direction = WESTON_INVERSE_TF;
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return true;
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}
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/* This is the inverse of a pure power-law with custom exp. If
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* clamped_input == false, this matches WESTON_TF_POWER (parametric TF
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* that is not clamped). */
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if (!clamped_input) {
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curve->type = WESTON_COLOR_CURVE_TYPE_ENUM;
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enumerated->tf = weston_color_tf_info_from(compositor,
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WESTON_TF_POWER);
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enumerated->tf_direction = WESTON_INVERSE_TF;
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for (i = 0; i < 3; i++) {
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g = type_1_params[i][0];
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if (g == 0.0f) {
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err_msg = "WARNING: xform has a LittleCMS type -1 curve " \
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"(inverse of pure power-law) with exponent 1 " \
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"divided by 0, which is invalid";
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goto err;
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}
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enumerated->params[i][0] = g;
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}
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}
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/* Inverse of pure power-law with custom exp and clamped_input. We don't
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* have any TF that matches this, so let's use a parametric curve. */
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curve->type = WESTON_COLOR_CURVE_TYPE_PARAMETRIC;
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/* LittleCMS type -1 (inverse of type 1) is the inverse of the pure
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@ -523,16 +624,14 @@ linpow_from_type_1_inverse(struct weston_compositor *compositor,
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parametric->type = WESTON_COLOR_CURVE_PARAMETRIC_TYPE_LINPOW;
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parametric->clamped_input = clamped_input;
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for (i = 0; i < ARRAY_LENGTH(parametric->params); i++) {
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for (i = 0; i < 3; i++) {
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g = type_1_params[i][0];
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if (g == 0.0f) {
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err_msg = "WARNING: xform has a LittleCMS type -1 curve " \
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"(inverse of pure power-law) with exponent 1 " \
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"divided by 0, which is invalid";
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goto err;
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}
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parametric->params[i][0] = 1.0f / g;
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parametric->params[i][1] = 1.0f; /* a */
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parametric->params[i][2] = 0.0f; /* b */
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@ -554,11 +653,23 @@ linpow_from_type_4(struct weston_compositor *compositor,
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bool clamped_input)
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{
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struct weston_color_manager_lcms *cm = to_cmlcms(compositor->color_manager);
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struct weston_color_curve_enum *enumerated = &curve->u.enumerated;
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struct weston_color_curve_parametric *parametric = &curve->u.parametric;
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const struct weston_color_tf_info *tf_info;
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float g, a, b, c, d;
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const char *err_msg;
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unsigned int i;
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/* Check if LittleCMS curve matches any TF (except the parametric TF's). */
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tf_info = lcms_curve_matches_any_tf(compositor, 4, clamped_input, type_4_params);
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if (tf_info) {
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curve->type = WESTON_COLOR_CURVE_TYPE_ENUM;
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enumerated->tf = tf_info;
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enumerated->tf_direction = WESTON_FORWARD_TF;
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return true;
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}
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/* No TF's matches this curve, so let's put it in a parametric curve. */
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curve->type = WESTON_COLOR_CURVE_TYPE_PARAMETRIC;
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/* LittleCMS type 4 is almost exactly the same as LINPOW. So simply copy
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@ -576,7 +687,7 @@ linpow_from_type_4(struct weston_compositor *compositor,
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parametric->type = WESTON_COLOR_CURVE_PARAMETRIC_TYPE_LINPOW;
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parametric->clamped_input = clamped_input;
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for (i = 0; i < ARRAY_LENGTH(parametric->params); i++) {
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for (i = 0; i < 3; i++) {
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g = type_4_params[i][0];
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a = type_4_params[i][1];
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b = type_4_params[i][2];
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@ -622,11 +733,23 @@ powlin_from_type_4_inverse(struct weston_compositor *compositor,
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bool clamped_input)
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{
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struct weston_color_manager_lcms *cm = to_cmlcms(compositor->color_manager);
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struct weston_color_curve_enum *enumerated = &curve->u.enumerated;
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struct weston_color_curve_parametric *parametric = &curve->u.parametric;
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const struct weston_color_tf_info *tf_info;
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float g, a, b, c, d;
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const char *err_msg;
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unsigned int i;
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/* Check if LittleCMS curve matches any TF (except the parametric ones). */
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tf_info = lcms_curve_matches_any_tf(compositor, 4, clamped_input, type_4_params);
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if (tf_info) {
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curve->type = WESTON_COLOR_CURVE_TYPE_ENUM;
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enumerated->tf = tf_info;
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enumerated->tf_direction = WESTON_INVERSE_TF;
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return true;
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}
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/* No TF's matches this curve, so let's put it in a parametric curve. */
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curve->type = WESTON_COLOR_CURVE_TYPE_PARAMETRIC;
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/* LittleCMS type -4 (inverse of type 4) fits into POWLIN. We need to
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@ -679,7 +802,7 @@ powlin_from_type_4_inverse(struct weston_compositor *compositor,
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parametric->type = WESTON_COLOR_CURVE_PARAMETRIC_TYPE_POWLIN;
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parametric->clamped_input = clamped_input;
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for (i = 0; i < ARRAY_LENGTH(parametric->params); i++) {
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for (i = 0; i < 3; i++) {
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g = type_4_params[i][0];
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a = type_4_params[i][1];
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b = type_4_params[i][2];
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@ -483,3 +483,42 @@ weston_color_tf_info_from_protocol(uint32_t protocol_tf)
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return NULL;
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}
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WL_EXPORT const struct weston_color_tf_info *
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weston_color_tf_info_from_parametric_curve(struct weston_color_curve_parametric *curve)
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{
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const struct weston_color_tf_info *tf_info;
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float PRECISION = 1e-5;
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unsigned int i, j, k;
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bool params_match;
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for (i = 0; i < ARRAY_LENGTH(color_tf_info_table); i++) {
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tf_info = &color_tf_info_table[i];
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/**
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* Ignore parametric TF's; we can't compare a curve with them,
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* as they are not pre-defined, but parametric.
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*/
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if (tf_info->count_parameters > 0)
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continue;
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if (tf_info->curve.type != curve->type)
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continue;
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if (tf_info->curve.clamped_input != curve->clamped_input)
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continue;
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for (j = 0, params_match = true; j < 3 && params_match == true; j++) {
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for (k = 0; k < MAX_PARAMS_PARAM_CURVE && params_match == true; k++) {
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if (fabsf(tf_info->curve.params[j][k] - curve->params[j][k]) > PRECISION)
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params_match = false;
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}
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}
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if (!params_match)
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continue;
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return tf_info;
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}
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return NULL;
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}
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@ -149,4 +149,7 @@ weston_color_tf_info_from(struct weston_compositor *compositor,
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const struct weston_color_tf_info *
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weston_color_tf_info_from_protocol(uint32_t protocol_tf);
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const struct weston_color_tf_info *
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weston_color_tf_info_from_parametric_curve(struct weston_color_curve_parametric *curve);
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#endif /* WESTON_COLOR_PROPERTIES_H */
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