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r.colors.out: Add JSON support (#4555)
* r.colors.out: added json output Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * fixed CI build issues Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * refactor code Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * added more color formats and tests Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * additional changes based on review Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * fixes prototype declaration Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * fixes test Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * added option instead of flags Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * Add a standard parser option for color formatting Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * added changes based on review Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * fixes function name Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * fixes pytest failure Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com> * Update lib/gis/parser_standard_options.c --------- Signed-off-by: Nishant Bansal <nishant.bansal.282003@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| #include <grass/gis.h> | ||
| #include <grass/parson.h> | ||
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| enum ColorFormat { RGB, HEX, HSV, TRIPLET }; | ||
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| void print_json_colors(struct Colors *colors, DCELL min, DCELL max, FILE *fp, | ||
| int perc, enum ColorFormat clr_frmt); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,265 @@ | ||
| #include <math.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
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| #include <grass/gis.h> | ||
| #include <grass/glocale.h> | ||
| #include <grass/parson.h> | ||
| #include <grass/raster.h> | ||
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| #include "local_proto.h" | ||
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| #define COLOR_STRING_LENGTH 30 | ||
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| /*! | ||
| \brief Closes the file if it is not stdout. | ||
| \param fp file where to print color table rules | ||
| */ | ||
| static void close_file(FILE *fp) | ||
| { | ||
| if (fp != stdout) | ||
| fclose(fp); | ||
| } | ||
|
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| /*! | ||
| \brief Converts RGB color values to HSV format. | ||
| \note This implementation is experimental and may be subject to change. | ||
| \param r red component of the RGB color | ||
| \param g green component of the RGB color | ||
| \param b blue component of the RGB color | ||
| \param[out] h pointer to store the calculated hue | ||
| \param[out] s pointer to store the calculated saturation | ||
| \param[out] v pointer to store the calculated value | ||
| */ | ||
| static void rgb_to_hsv(int r, int g, int b, float *h, float *s, float *v) | ||
| { | ||
| float r_norm = (float)r / 255.0f; | ||
| float g_norm = (float)g / 255.0f; | ||
| float b_norm = (float)b / 255.0f; | ||
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| float cmax = MAX(r_norm, MAX(g_norm, b_norm)); | ||
| float cmin = MIN(r_norm, MIN(g_norm, b_norm)); | ||
| float diff = cmax - cmin; | ||
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| if (cmax == cmin) { | ||
| *h = 0; | ||
| } | ||
| else if (cmax == r_norm) { | ||
| *h = fmodf((60.0f * ((g_norm - b_norm) / diff) + 360.0f), 360.0f); | ||
| } | ||
| else if (cmax == g_norm) { | ||
| *h = fmodf((60.0f * ((b_norm - r_norm) / diff) + 120.0f), 360.0f); | ||
| } | ||
| else { | ||
| *h = fmodf((60.0f * ((r_norm - g_norm) / diff) + 240.0f), 360.0f); | ||
| } | ||
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| if (cmax == 0) { | ||
| *s = 0; | ||
| } | ||
| else { | ||
| *s = (diff / cmax) * 100.0f; | ||
| } | ||
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| *v = cmax * 100.0f; | ||
| } | ||
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| /*! | ||
| \brief Writes color entry in JSON in specified clr_frmt. | ||
| \param r red component of RGB color | ||
| \param g green component of RGB color | ||
| \param b blue component of RGB color | ||
| \param clr_frmt color format to be used (RGB, HEX, HSV, TRIPLET). | ||
| \param color_object pointer to the JSON object | ||
| */ | ||
| static void set_color(int r, int g, int b, enum ColorFormat clr_frmt, | ||
| JSON_Object *color_object) | ||
| { | ||
| char color_string[COLOR_STRING_LENGTH]; | ||
| float h, s, v; | ||
|
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| switch (clr_frmt) { | ||
| case RGB: | ||
| snprintf(color_string, sizeof(color_string), "rgb(%d, %d, %d)", r, g, | ||
| b); | ||
| json_object_set_string(color_object, "rgb", color_string); | ||
| break; | ||
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| case HEX: | ||
| snprintf(color_string, sizeof(color_string), "#%02X%02X%02X", r, g, b); | ||
| json_object_set_string(color_object, "hex", color_string); | ||
| break; | ||
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| case HSV: | ||
| rgb_to_hsv(r, g, b, &h, &s, &v); | ||
| snprintf(color_string, sizeof(color_string), "hsv(%d, %d, %d)", (int)h, | ||
| (int)s, (int)v); | ||
| json_object_set_string(color_object, "hsv", color_string); | ||
| break; | ||
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| case TRIPLET: | ||
| snprintf(color_string, sizeof(color_string), "%d:%d:%d", r, g, b); | ||
| json_object_set_string(color_object, "triplet", color_string); | ||
| break; | ||
| } | ||
| } | ||
|
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| /*! | ||
| \brief Writes a JSON rule for a specific color entry. | ||
| \param val pointer to the DCELL value | ||
| \param min,max minimum and maximum value for percentage output (used only | ||
| when \p perc is non-zero) | ||
| \param r red component of RGB color | ||
| \param g green component of RGB color | ||
| \param b blue component of RGB color | ||
| \param root_array pointer to the JSON array | ||
| \param perc TRUE for percentage output | ||
| \param clr_frmt color format to be used (RBG, HEX, HSV, TRIPLET). | ||
| \param fp file where to print color table rules | ||
| \param root_value pointer to json value | ||
| */ | ||
| static void write_json_rule(DCELL *val, DCELL *min, DCELL *max, int r, int g, | ||
| int b, JSON_Array *root_array, int perc, | ||
| enum ColorFormat clr_frmt, FILE *fp, | ||
| JSON_Value *root_value) | ||
| { | ||
| static DCELL v0; | ||
| static int r0 = -1, g0 = -1, b0 = -1; | ||
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| // Skip writing if the current color is the same as the last one | ||
| if (v0 == *val && r0 == r && g0 == g && b0 == b) | ||
| return; | ||
| // Update last processed values | ||
| v0 = *val, r0 = r, g0 = g, b0 = b; | ||
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| JSON_Value *color_value = json_value_init_object(); | ||
| if (color_value == NULL) { | ||
| json_value_free(root_value); | ||
| close_file(fp); | ||
| G_fatal_error(_("Failed to initialize JSON object. Out of memory?")); | ||
| } | ||
| JSON_Object *color_object = json_object(color_value); | ||
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| // Set the value as a percentage if requested, otherwise set it as-is | ||
| if (perc) | ||
| json_object_set_number(color_object, "value", | ||
| 100 * (*val - *min) / (*max - *min)); | ||
| else | ||
| json_object_set_number(color_object, "value", *val); | ||
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| set_color(r, g, b, clr_frmt, color_object); | ||
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| json_array_append_value(root_array, color_value); | ||
| } | ||
|
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| /*! | ||
| \brief Print color table in JSON format | ||
| \param colors pointer to Colors structure | ||
| \param min,max minimum and maximum value for percentage output (used only | ||
| when \p perc is non-zero) | ||
| \param fp file where to print color table rules | ||
| \param perc TRUE for percentage output | ||
| \param clr_frmt color format to be used (RBG, HEX, HSV, TRIPLET). | ||
| */ | ||
| void print_json_colors(struct Colors *colors, DCELL min, DCELL max, FILE *fp, | ||
| int perc, enum ColorFormat clr_frmt) | ||
| { | ||
| JSON_Value *root_value = json_value_init_array(); | ||
| if (root_value == NULL) { | ||
| close_file(fp); | ||
| G_fatal_error(_("Failed to initialize JSON array. Out of memory?")); | ||
| } | ||
| JSON_Array *root_array = json_array(root_value); | ||
|
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| if (colors->version < 0) { | ||
| /* 3.0 format */ | ||
| CELL lo, hi; | ||
|
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| // Retrieve the integer color range | ||
| Rast_get_c_color_range(&lo, &hi, colors); | ||
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| for (int i = lo; i <= hi; i++) { | ||
| unsigned char r, g, b, set; | ||
| DCELL val = (DCELL)i; | ||
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| // Look up the color for the current value and write JSON rule | ||
| Rast_lookup_c_colors(&i, &r, &g, &b, &set, 1, colors); | ||
| write_json_rule(&val, &min, &max, r, g, b, root_array, perc, | ||
| clr_frmt, fp, root_value); | ||
| } | ||
| } | ||
| else { | ||
| // Get the count of floating-point color rules | ||
| int count = Rast_colors_count(colors); | ||
|
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| for (int i = 0; i < count; i++) { | ||
| DCELL val1, val2; | ||
| unsigned char r1, g1, b1, r2, g2, b2; | ||
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| // Retrieve the color rule values and their respective RGB colors | ||
| Rast_get_fp_color_rule(&val1, &r1, &g1, &b1, &val2, &r2, &g2, &b2, | ||
| colors, count - 1 - i); | ||
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| // write JSON rule | ||
| write_json_rule(&val1, &min, &max, r1, g1, b1, root_array, perc, | ||
| clr_frmt, fp, root_value); | ||
| write_json_rule(&val2, &min, &max, r2, g2, b2, root_array, perc, | ||
| clr_frmt, fp, root_value); | ||
| } | ||
| } | ||
|
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| // Add special color entries for "null" and "default" values | ||
| { | ||
| int r, g, b; | ||
|
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| // Get RGB color for null values and create JSON entry | ||
| Rast_get_null_value_color(&r, &g, &b, colors); | ||
| JSON_Value *nv_value = json_value_init_object(); | ||
| if (nv_value == NULL) { | ||
| json_value_free(root_value); | ||
| close_file(fp); | ||
| G_fatal_error( | ||
| _("Failed to initialize JSON object. Out of memory?")); | ||
| } | ||
| JSON_Object *nv_object = json_object(nv_value); | ||
| json_object_set_string(nv_object, "value", "nv"); | ||
| set_color(r, g, b, clr_frmt, nv_object); | ||
| json_array_append_value(root_array, nv_value); | ||
|
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| // Get RGB color for default values and create JSON entry | ||
| Rast_get_default_color(&r, &g, &b, colors); | ||
| JSON_Value *default_value = json_value_init_object(); | ||
| if (default_value == NULL) { | ||
| json_value_free(root_value); | ||
| close_file(fp); | ||
| G_fatal_error( | ||
| _("Failed to initialize JSON object. Out of memory?")); | ||
| } | ||
| JSON_Object *default_object = json_object(default_value); | ||
| json_object_set_string(default_object, "value", "default"); | ||
| set_color(r, g, b, clr_frmt, default_object); | ||
| json_array_append_value(root_array, default_value); | ||
| } | ||
|
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| // Serialize JSON array to a string and print to the file | ||
| char *json_string = json_serialize_to_string_pretty(root_value); | ||
| if (!json_string) { | ||
| json_value_free(root_value); | ||
| close_file(fp); | ||
| G_fatal_error(_("Failed to serialize JSON to pretty format.")); | ||
| } | ||
|
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| fputs(json_string, fp); | ||
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| json_free_serialized_string(json_string); | ||
| json_value_free(root_value); | ||
|
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| close_file(fp); | ||
| } |
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