mirror of https://github.com/vurtun/nuklear.git
202 lines
6.7 KiB
C
202 lines
6.7 KiB
C
#include "nuklear.h"
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#include "nuklear_internal.h"
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/* ==============================================================
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*
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* COLOR PICKER
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*
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* ===============================================================*/
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NK_LIB int
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nk_color_picker_behavior(nk_flags *state,
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const struct nk_rect *bounds, const struct nk_rect *matrix,
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const struct nk_rect *hue_bar, const struct nk_rect *alpha_bar,
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struct nk_colorf *color, const struct nk_input *in)
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{
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float hsva[4];
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int value_changed = 0;
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int hsv_changed = 0;
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NK_ASSERT(state);
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NK_ASSERT(matrix);
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NK_ASSERT(hue_bar);
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NK_ASSERT(color);
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/* color matrix */
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nk_colorf_hsva_fv(hsva, *color);
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if (nk_button_behavior(state, *matrix, in, NK_BUTTON_REPEATER)) {
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hsva[1] = NK_SATURATE((in->mouse.pos.x - matrix->x) / (matrix->w-1));
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hsva[2] = 1.0f - NK_SATURATE((in->mouse.pos.y - matrix->y) / (matrix->h-1));
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value_changed = hsv_changed = 1;
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}
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/* hue bar */
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if (nk_button_behavior(state, *hue_bar, in, NK_BUTTON_REPEATER)) {
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hsva[0] = NK_SATURATE((in->mouse.pos.y - hue_bar->y) / (hue_bar->h-1));
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value_changed = hsv_changed = 1;
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}
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/* alpha bar */
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if (alpha_bar) {
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if (nk_button_behavior(state, *alpha_bar, in, NK_BUTTON_REPEATER)) {
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hsva[3] = 1.0f - NK_SATURATE((in->mouse.pos.y - alpha_bar->y) / (alpha_bar->h-1));
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value_changed = 1;
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}
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}
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nk_widget_state_reset(state);
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if (hsv_changed) {
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*color = nk_hsva_colorfv(hsva);
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*state = NK_WIDGET_STATE_ACTIVE;
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}
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if (value_changed) {
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color->a = hsva[3];
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*state = NK_WIDGET_STATE_ACTIVE;
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}
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/* set color picker widget state */
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if (nk_input_is_mouse_hovering_rect(in, *bounds))
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*state = NK_WIDGET_STATE_HOVERED;
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if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, *bounds))
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*state |= NK_WIDGET_STATE_ENTERED;
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else if (nk_input_is_mouse_prev_hovering_rect(in, *bounds))
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*state |= NK_WIDGET_STATE_LEFT;
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return value_changed;
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}
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NK_LIB void
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nk_draw_color_picker(struct nk_command_buffer *o, const struct nk_rect *matrix,
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const struct nk_rect *hue_bar, const struct nk_rect *alpha_bar,
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struct nk_colorf col)
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{
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NK_STORAGE const struct nk_color black = {0,0,0,255};
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NK_STORAGE const struct nk_color white = {255, 255, 255, 255};
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NK_STORAGE const struct nk_color black_trans = {0,0,0,0};
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const float crosshair_size = 7.0f;
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struct nk_color temp;
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float hsva[4];
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float line_y;
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int i;
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NK_ASSERT(o);
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NK_ASSERT(matrix);
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NK_ASSERT(hue_bar);
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/* draw hue bar */
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nk_colorf_hsva_fv(hsva, col);
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for (i = 0; i < 6; ++i) {
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NK_GLOBAL const struct nk_color hue_colors[] = {
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{255, 0, 0, 255}, {255,255,0,255}, {0,255,0,255}, {0, 255,255,255},
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{0,0,255,255}, {255, 0, 255, 255}, {255, 0, 0, 255}
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};
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nk_fill_rect_multi_color(o,
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nk_rect(hue_bar->x, hue_bar->y + (float)i * (hue_bar->h/6.0f) + 0.5f,
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hue_bar->w, (hue_bar->h/6.0f) + 0.5f), hue_colors[i], hue_colors[i],
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hue_colors[i+1], hue_colors[i+1]);
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}
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line_y = (float)(int)(hue_bar->y + hsva[0] * matrix->h + 0.5f);
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nk_stroke_line(o, hue_bar->x-1, line_y, hue_bar->x + hue_bar->w + 2,
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line_y, 1, nk_rgb(255,255,255));
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/* draw alpha bar */
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if (alpha_bar) {
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float alpha = NK_SATURATE(col.a);
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line_y = (float)(int)(alpha_bar->y + (1.0f - alpha) * matrix->h + 0.5f);
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nk_fill_rect_multi_color(o, *alpha_bar, white, white, black, black);
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nk_stroke_line(o, alpha_bar->x-1, line_y, alpha_bar->x + alpha_bar->w + 2,
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line_y, 1, nk_rgb(255,255,255));
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}
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/* draw color matrix */
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temp = nk_hsv_f(hsva[0], 1.0f, 1.0f);
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nk_fill_rect_multi_color(o, *matrix, white, temp, temp, white);
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nk_fill_rect_multi_color(o, *matrix, black_trans, black_trans, black, black);
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/* draw cross-hair */
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{struct nk_vec2 p; float S = hsva[1]; float V = hsva[2];
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p.x = (float)(int)(matrix->x + S * matrix->w);
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p.y = (float)(int)(matrix->y + (1.0f - V) * matrix->h);
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nk_stroke_line(o, p.x - crosshair_size, p.y, p.x-2, p.y, 1.0f, white);
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nk_stroke_line(o, p.x + crosshair_size + 1, p.y, p.x+3, p.y, 1.0f, white);
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nk_stroke_line(o, p.x, p.y + crosshair_size + 1, p.x, p.y+3, 1.0f, white);
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nk_stroke_line(o, p.x, p.y - crosshair_size, p.x, p.y-2, 1.0f, white);}
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}
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NK_LIB int
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nk_do_color_picker(nk_flags *state,
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struct nk_command_buffer *out, struct nk_colorf *col,
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enum nk_color_format fmt, struct nk_rect bounds,
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struct nk_vec2 padding, const struct nk_input *in,
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const struct nk_user_font *font)
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{
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int ret = 0;
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struct nk_rect matrix;
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struct nk_rect hue_bar;
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struct nk_rect alpha_bar;
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float bar_w;
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NK_ASSERT(out);
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NK_ASSERT(col);
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NK_ASSERT(state);
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NK_ASSERT(font);
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if (!out || !col || !state || !font)
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return ret;
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bar_w = font->height;
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bounds.x += padding.x;
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bounds.y += padding.x;
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bounds.w -= 2 * padding.x;
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bounds.h -= 2 * padding.y;
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matrix.x = bounds.x;
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matrix.y = bounds.y;
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matrix.h = bounds.h;
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matrix.w = bounds.w - (3 * padding.x + 2 * bar_w);
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hue_bar.w = bar_w;
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hue_bar.y = bounds.y;
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hue_bar.h = matrix.h;
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hue_bar.x = matrix.x + matrix.w + padding.x;
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alpha_bar.x = hue_bar.x + hue_bar.w + padding.x;
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alpha_bar.y = bounds.y;
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alpha_bar.w = bar_w;
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alpha_bar.h = matrix.h;
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ret = nk_color_picker_behavior(state, &bounds, &matrix, &hue_bar,
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(fmt == NK_RGBA) ? &alpha_bar:0, col, in);
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nk_draw_color_picker(out, &matrix, &hue_bar, (fmt == NK_RGBA) ? &alpha_bar:0, *col);
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return ret;
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}
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NK_API int
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nk_color_pick(struct nk_context * ctx, struct nk_colorf *color,
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enum nk_color_format fmt)
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{
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struct nk_window *win;
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struct nk_panel *layout;
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const struct nk_style *config;
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const struct nk_input *in;
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enum nk_widget_layout_states state;
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struct nk_rect bounds;
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NK_ASSERT(ctx);
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NK_ASSERT(color);
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NK_ASSERT(ctx->current);
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NK_ASSERT(ctx->current->layout);
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if (!ctx || !ctx->current || !ctx->current->layout || !color)
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return 0;
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win = ctx->current;
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config = &ctx->style;
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layout = win->layout;
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state = nk_widget(&bounds, ctx);
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if (!state) return 0;
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in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
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return nk_do_color_picker(&ctx->last_widget_state, &win->buffer, color, fmt, bounds,
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nk_vec2(0,0), in, config->font);
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}
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NK_API struct nk_colorf
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nk_color_picker(struct nk_context *ctx, struct nk_colorf color,
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enum nk_color_format fmt)
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{
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nk_color_pick(ctx, &color, fmt);
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return color;
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}
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